JP6307381B2 - SPD separator and monitoring system - Google Patents

Description

  The present invention relates to a separator for a surge protective device (hereinafter referred to as “SPD”) and a monitoring system. For example, when an SPD is short-circuited, the SPD is separated quickly from a power line. The present invention relates to a monitoring system for notifying a remote place of a disconnection of a power line by a separator and an SPD separator.

  In general, an SPD has a varistor inside and operates to protect a target telecommunication device from abnormal voltage / current such as lightning surge. The varistor built into this SPD gradually deteriorates when lightning surges are repeatedly processed, and the leakage current increases, and if a significantly deteriorated SPD is installed, it may cause a fire or the like. It is dangerous. For this reason, the SPD has a built-in “detaching mechanism” that has a role of physically disconnecting its own power supply circuit when the leakage current becomes large. In general, the disconnection mechanism employs a structure in which its own power supply circuit is disconnected by detecting heat generation due to an increase in leakage current.

  On the other hand, SPD has an excessive lightning surge current due to a lightning strike that rarely exceeds the withstand current design value, or an excessive load current due to a short circuit failure of a power line (hereinafter, such an electric current is referred to as an “overcurrent”). May be energized. In such a case, since there is a risk that the SPD is burned out, a breaker and a fuse are provided for backup on the primary side (power supply line side) of the SPD. These circuit breakers and fuses are commonly called SPD separators. When the above-described overcurrent is applied to the SPD, the circuit breakers and fuses operate so as to disconnect their power supply circuits. Note that the SPD separator and the SPD built-in separation mechanism are different.

  For example, Patent Document 1 discloses that an SPD separator is configured by installing a wiring breaker (power supply breaker) in front of an SPD.

  Patent Document 2 discloses a circuit breaker having a main cover and an auxiliary cover, and when the auxiliary cover is opened, the wiring breaking mechanism automatically trips.

  Patent Documents 3 and 4 disclose that an SPD separator is configured by installing a fuse in the previous stage of SPD.

  Since the SPD separator as described above operates to disconnect its own power supply circuit when an overcurrent is applied to the SPD, there is a risk of burning the SPD by using such an SPD separator. Can be avoided.

JP 2002-101505 A Japanese Patent Laid-Open No. 06-111704 JP 2004-036013 A JP 2014-044925 A

  By the way, when the SPD separator operates, the state of the SPD is inspected. As a result, if the SPD is deteriorated or damaged, the SPD is replaced. Also, the state of the SPD separator is inspected. As a result, if the SPD separator is deteriorated or damaged, the SPD separator is replaced. Such an operation needs to be performed promptly after the SPD separator operates. This is because when the SPD separator operates, the SPD is disconnected from the power supply line, and the telecommunication device (protected device) to be protected is not protected.

  However, conventional SPD separators as disclosed in Patent Documents 1 to 4 are housed in a power distribution board (wiring box) and are often installed in an invisible state. Therefore, there is a problem that it is often difficult to easily grasp whether or not the SPD separator has been operated. Therefore, it is often impossible to quickly perform the above-described work after the SPD separator operates.

  For example, in the case of the wire breaker type SPD separator disclosed in Patent Documents 1 and 2, whether or not the SPD separator is activated (whether or not the switch is turned off) is visually checked at the installation location. If you do not check in, you do not know. In other words, it is impossible to grasp in real time from a remote location. Further, when inspecting whether or not the SPD separator is deteriorated or damaged, since there is no deterioration display, it cannot be judged from the appearance alone and needs to be disassembled. Furthermore, when replacing the SPD separator, it is necessary to remove the power line connected by screwing from the SPD separator and to remove the SPD separator body from the panel. After that, it is necessary to attach the main body of the new SPD separator to the panel and connect the power line.

  Further, for example, in the case of the fuse type SPD separator disclosed in Patent Documents 3 and 4, as in the case of the wire breaker type SPD separator, whether or not the SPD separator is operated (the fuse is disconnected). Whether or not it is) is not known without visual confirmation at the installation location. In other words, even in this case, it is impossible to grasp in real time from a remote location. Further, since it has a thermo label display, it is not accurate to some extent when it is inspected whether the SPD separator is deteriorated or damaged. This is because the thermo label is arranged on the resistor, and the color changes in response to the heat generated by the resistor, and the color does not necessarily change due to the disconnection of the fuse. For this reason, it is impossible to accurately determine whether or not the fuse has blown from the appearance alone, and it is necessary to disassemble and inspect it after all. Further, the fuse is mounted on the substrate by soldering, accommodated in a box, and a terminal for connecting a power supply line extends from the substrate and is integrated with the substrate. For this reason, when exchanging, it is necessary to first open the lid of the box, remove the power line connected by screwing from the terminal, and remove the board. After that, it is necessary to attach a new board, connect the power line, and finally close the box lid.

  As described above, in any type of SPD separator, inspection and replacement work is complicated, and there is a risk of a short-circuit accident.

  The present invention has been made in view of such a situation, and provides an SPD separator that can be easily checked for operation and deterioration, and can perform maintenance work safely, easily, and in a short time. .

  In order to solve the above problems, an SPD separator according to the present invention is connected to a power supply circuit on the primary side, a plurality of fuses connected to the SPD on the secondary side, and a secondary side of the plurality of fuses. And a detection display unit. Here, the detection display unit is connected to the display unit connected to the secondary side terminals of the plurality of fuses, and is connected in parallel with the display unit to detect the disconnection of the fuse and to detect the disconnection of the fuse Detecting means for outputting a signal and for setting the display means to an off state.

  Further features of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the SPD separator of the present invention, the operation and deterioration of the SPD separator can be easily confirmed, and maintenance work can be performed safely, easily, and in a short time.

It is a figure which shows the external appearance structure of the separator for SPD by embodiment of this invention. It is a figure for demonstrating the procedure when attaching a detection display part to the base of the separator for SPD. It is a figure which shows the attachment structure of the detection display part in the base of the separator for SPD. It is a figure which shows the attachment structure to the base in a detection display part. It is a figure which shows the detection circuit when the separator for SPD by embodiment of this invention is comprised by the single phase 3 wire system. It is a figure which shows the detection circuit when the separator for SPD by embodiment of this invention is comprised by the three-phase three-wire system. It is a figure which shows schematic structure of the monitoring system by embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be noted that this embodiment is merely an example for realizing the present invention, and does not limit the technical scope of the present invention. In each drawing, the same reference numerals are assigned to common components.

<External configuration of SPD separator>
FIG. 1 is a diagram showing the overall appearance of an SPD separator 1 according to an embodiment of the present invention. The SPD separator 1 is disposed on a pedestal (holder) 10, three fuse plugs 11 to 13 disposed on the pedestal 10, and adjacent to the fuse plugs 11 to 13. And a detection display unit 20.

  The pedestal 10 has a connection terminal (primary side) 14 for connecting a power source (not shown) and an SPD separator, a connection terminal (secondary side) 15 for connecting an SPD and an SPD separator (not shown), It has further. Each of the connection terminals 14 and 15 has three terminals. Each of the connection terminals 14 and 15 is provided with three terminals 15-1 to 15-3 (which are also provided on the primary side in the same manner, but not shown) as connection portions with the fuse plugs. It can be operated by connecting a connection line to any terminal.

  The fuse plugs 11 to 13 have a connection terminal (primary side) for connecting a power source and a connection terminal (secondary side) for connecting an SPD, which are not shown in FIG. In the single-phase three-wire SPD separator described later, the primary side input terminals are referred to as Nin, L1, and L2, respectively, and the secondary side output terminals are referred to as Nout, L1, and L2, respectively. In the three-phase three-wire SPD separator described later, the primary input terminals are referred to as L1, L2, and L3, respectively, and the secondary output terminals are referred to as L1, L2, and L3, respectively. .

  The detection display unit 20 includes display lamps (for example, LEDs) 21 and 22, an alarm output terminal 23, and a housing gripping unit 24 provided on the housing surface of the detection display unit 20. The display lamps 21 and 22 are lit in a normal state and operate so as to be turned off when any of the fuses in the fuse plugs 11 to 13 is cut. The display lamps 21 and 22 may be provided anywhere on the surface of the casing as long as it can be easily confirmed to be turned off from the outside. The alarm output terminal 23 is a terminal for outputting an alarm signal to the outside when any of the fuses in the fuse plugs 11 to 13 is cut. This alarm signal is transmitted, for example, to a remotely installed monitoring device (management computer), detects that the SPD separator has been remotely operated, and replaces a fuse plug having a blown fuse. It is possible to check the SPD separator by detecting some other abnormality. Since the SPD separator 1 is housed in the wiring box, the detection display unit 20 may be difficult to remove from the base 10. For this reason, in order to be able to remove the detection display part 20 from the base 10 more easily, the housing | casing holding | grip part 24 is provided. Similarly, a housing grip portion 27 is provided on the surface of the detection display unit 20 that faces the surface on which the housing grip portion 24 is provided (see FIG. 4). Thereby, the catch of the finger which grasps the detection display unit 20 is improved, and the finger is difficult to slip when the detection display unit 20 is detached from the base 10.

  The attachment of the detection display unit 20 to the base 10 of the SPD separator 1 will be described with reference to FIGS. FIG. 2 is a view for explaining a procedure when the detection display unit 20 is attached to the base 10 of the SPD separator 1. FIG. 3 is a diagram showing a mounting structure of the detection display unit 20 in the base 10 of the SPD separator 1. FIG. 4 is a diagram illustrating a structure for attaching the detection display unit 20 to the pedestal 10.

  As shown in FIG. 2, with the alarm output terminal 23 removed from the detection display unit 20, the concave display terminal unit 29 (see FIG. 4) provided in the detection display unit 20 is provided on the pedestal 10. It is fitted and fixed to the mounting terminal portion 18 of the mold. The attachment terminal portion 18 has a function of fixing the detection display portion 20 to the base 10 and also has a function of electrically connecting the detection display portion 20 and each of the fuse plugs 11 to 13. When the main body of the detection display unit 20 is attached to the pedestal 10, the detection display unit 20 can also be moved to the bottom surface of the pedestal 10 by sliding the guide rail 26 of the detection display unit 20 along the notch groove 16 of the pedestal 10. Fixed to. Further, the guide rail 28 of the detection display unit 20 engages with the engagement rail 17 of the base 10 and slides to the bottom surface of the base 10 along the notch groove 19 of the fuse plugs 11 to 13 fixed to the base 10. By doing so, the detection display unit 20 is fixed to the base 10. The base 10 is provided with an erroneous insertion prevention rail 31, and the detection display unit 20 is provided with an erroneous insertion prevention groove 30. Therefore, when an inappropriate detection display unit 20 is to be attached to the pedestal 10, the erroneous insertion prevention rail 31 and the erroneous insertion prevention groove 30 do not mesh well and the detection display unit 20 cannot be attached to the pedestal. . The relationship between the rail and the groove may be reversed between the detection display unit 20 and the pedestal 10.

  Returning to FIG. 2, after attaching the main body of the detection display unit 20 to the base 10, the alarm output terminal 23 connected to a network line (not shown) is then fitted into the terminal connection unit 25. Since the SPD separator 1 is often installed outdoors together with the SPD, it may be difficult to attach the detection display unit 20 to the base 10 when the detection display unit 20 is connected to the network. . On the other hand, since the work of attaching the network line itself to the alarm output terminal 23 fixed to the detection display unit 20 may be a fine work, it may be a burden on the operator. For this reason, the SPD separator 1 according to the embodiment of the present invention is configured so that the alarm output terminal 23 can be disconnected from the main body of the detection display unit 20, and the detection display is performed after the network line is connected to the alarm output terminal 23. The unit 20 is attached to the main body.

  Further, as shown in FIGS. 2 and 4, housing grips 24 and 27 are provided on the opposing surfaces of the detection display unit 20. The housing grips 24 and 27 are configured by forming irregularities (projections) on the surface of the detection display unit 20. As shown in FIGS. 2 and 4, the unevenness may be a plurality of rail-shaped streaks or a plurality of protrusions formed on the surface of the detection display unit 20. Moreover, the housing | casing holding parts 24 and 27 are formed in the position which the detection display part 20 exposes in the state attached to the base 10 of the separator 1 for SPD. It should be noted that the casing gripping portions 24 and 27 are not provided on the facing surface other than the facing surface provided with the casing gripping portions 24 and 27 in FIG. This is because the operator cannot remove the detection display unit 20 while holding the opposite surface.

  As described above, in the embodiment of the present invention, in the SPD separator 1, the fuse plugs 11 to 13 and the detection display unit 20 are separate components (separated configurations). For this reason, even when one fuse plug is cut or when the LED of the detection display unit 20 reaches the end of its life, only the fuse plug and the detection display unit 20 need be replaced. There is no need to replace the whole. Therefore, the maintenance cost can be minimized.

<Internal circuit of SPD separator (detection circuit)>
(1) In the case of a single-phase three-wire SPD separator FIG. 5 is a diagram showing a detection circuit when the SPD separator according to the embodiment of the present invention is configured in a single-phase three-wire system. FIG. 5A shows the configuration of the detection circuit, and FIG. 5B is a diagram showing the relationship between the output switches of the relays in the detection circuit.

  The detection circuit includes fuses 51 to 53 included in the fuse plugs 11 to 13, LEDs 21 and 22 included in the detection display unit 20, a first relay 54, and a second relay 55. Yes. The first relay 54 is a relay for 100V, for example, and is connected to a fuse 51 connected to the terminal Nin and a fuse 52 connected to the terminal L1. The first relay 54 is connected to the terminal 231 of the alarm output terminal 23. The second relay 55 is a relay for 200V, for example, and is connected to the fuse 53 connected to the terminal L2 and the fuse 52 connected to the terminal L1. The second relay 55 is connected to the terminal 232 of the alarm output terminal 23. In FIG. 5B, the output switches 541 and 551 of each relay are in the off state (normal state). Accordingly, the terminals 231 and 232 of the alarm output terminal 23 are in an open state (off state). When either one of the output switches is turned on (short circuit), the terminals 231 and 232 of the alarm output terminal 23 are short circuited (on state).

(I) Normal operation Normal operation refers to a state in which all of the fuses 51 to 53 are not cut. At this time, a voltage of, for example, 100 V is applied between the primary side terminals Nin and L1, and a voltage of, for example, 200 V is applied between the terminals L1 and L2. That is, in the case of the single-phase three-wire system, the voltage between the primary side terminals Nin-L1 and the voltage between the terminals L1-L2 are different.

  As described above, in a normal time, a voltage (for example, 100 V) higher than the relay operating voltage is applied to both ends of the first relay 54. Therefore, the first relay 54 turns its output switch 541 to the off state. In this state, since current flows through the LED 21, the LED 21 is lit.

  In addition, a voltage (for example, 200 V) higher than the relay operating voltage is applied to both ends of the second relay 55. Therefore, the second relay 55 also turns its output switch 551 off. In this state, since current flows through the LED 22, the LED 22 is lit.

  Since both the output switches 541 and 551 are in the off state, the alarm output terminal 23 is opened, and the alarm output is turned off (that is, no warning signal is output). Since the alarm output is off, a remote monitoring device (not shown) connected to the alarm output terminal 23 can recognize that all the fuses 51 to 53 are normal without being cut. .

  Furthermore, since the LEDs 21 and 22 of the detection display unit 20 are lit, it can be confirmed that all the fuses 51 to 53 are normal by visual observation even at the place where the SPD separator 1 is installed.

(Ii) Operation when the fuse 51 is blown When the fuse 51 is cut, no voltage is applied to both ends of the first relay 54. At this time, the first relay 54 turns its output switch 541 on. Further, since no voltage is applied to both ends of the LED 21, no current flows through the LED 21, and the LED 21 is turned off.

  On the other hand, a voltage higher than the relay operating voltage is applied to both ends of the second relay 55. At this time, the relay 55 turns its output switch 551 off. Since voltage is applied to both ends of the LED 22, a current flows through the LED 22, and the LED 22 remains lit.

  The output switch 551 is in the off state, but the output switch 541 is in the on state, so that the alarm output terminal 23 is in a short circuit state and the alarm output is on (that is, an alarm signal is output). . Since the alarm output is on at this time, a distant monitoring device (not shown) connected to the alarm output terminal 23 can recognize that any of the fuses 51 to 53 is disconnected. Note that the monitoring device may display that the fuse is blown or sound a buzzer.

  Further, in the detection display unit 20, since the LED 21 is turned off and the LED 22 is turned on, it can be visually confirmed that the fuse 51 is disconnected at the place where the SPD separator 1 is installed.

  Even when the fuse 51 is not cut, if the first relay 54 is not applied with a voltage higher than the relay operating voltage, the operation is the same as when the fuse 51 is blown.

(Iii) Operation when the fuse 53 is blown When the fuse 53 is blown, no voltage is applied to both ends of the second relay 55. At this time, the second relay 55 turns its output switch 551 on. Further, since no voltage is applied to both ends of the LED 22, no current flows through the LED 22, and the LED 22 is turned off.

  On the other hand, a voltage higher than the relay operating voltage is applied to both ends of the first relay 54. At this time, the relay 54 sets its output switch 541 to the off state. Since voltage is applied to both ends of the LED 21, a current flows through the LED 21, and the LED 21 remains lit.

  The output switch 541 is in the off state, but the output switch 551 is in the on state, so that the alarm output terminal 23 is in a short circuit state and the alarm output is on (that is, an alarm signal is output). . Since the alarm output is on at this time, a distant monitoring device (not shown) connected to the alarm output terminal 23 can recognize that any of the fuses 51 to 53 is disconnected. Note that the monitoring device may display that the fuse is blown or sound a buzzer.

  Further, in the detection display unit 20, since the LED 22 is turned off and the LED 21 is turned on, it can be visually confirmed that the fuse 53 is disconnected at the place where the SPD separator 1 is installed.

  Even when the fuse 53 is not cut, if the second relay 55 is not applied with a voltage higher than the relay operating voltage, the operation is the same as when the fuse 53 is blown.

(Iv) Operation when the fuse 52 is blown When the fuse 52 is blown, a voltage (100 V) is applied between Nin and L2, so that a voltage is applied to both ends of the first relay 54 and the second relay 55. . Here, since the first relay 54 is a relay for 100V and the second relay 55 is a relay for 200V, when the fuse 52 is disconnected, the voltage (100V) applied between Nin and L2 is respectively It is shared (divided) to the relay. If the first relay 54 is a 100V relay and the second relay 55 is a 200V relay, the voltage applied to the first relay 54 is, for example, 100V / 3, and the voltage applied to the second relay 55 is, for example, 100V. × 2/3. Since the operating voltage of the first relay 54 is set higher than the shared voltage (100 V / 3) (for example, 50 V), a voltage equal to or higher than the relay operating voltage is present at both ends of the first relay 54. It won't hang. Therefore, at this time, the first relay 54 turns its output switch 541 on.

  Similarly, a voltage equal to or higher than the relay operating voltage (for example, 100 V) is not applied to both ends of the second relay 55. Therefore, the second relay 55 turns its output switch 551 on.

  In addition, since it is not disconnected between Nin-L2, an electric current will flow into LED21. However, as described above, the first relay 54 outputs a signal to turn off the switch arranged in series with the LED 21 at the same time when the output relay 541 of the first relay 54 is turned on. The LED 21 is turned off. Similarly, the LED 22 is also turned off.

  As described above, since both the output switches 541 and 551 are turned on, the alarm output terminal 23 is short-circuited (that is, an alarm signal is output). Since the alarm output is on at this time, a distant monitoring device (not shown) connected to the alarm output terminal 23 can recognize that any of the fuses 51 to 53 is disconnected. Note that the monitoring device may display that the fuse is blown or sound a buzzer. Furthermore, since both the LED 21 and the LED 22 are extinguished in the detection display unit 20, it can be visually confirmed that the fuse 52 is disconnected at the place where the SPD separator 1 is installed.

(2) In the case of a three-phase three-wire SPD separator FIG. 6 is a diagram showing a detection circuit when the SPD separator according to the embodiment of the present invention is configured in a three-phase three-wire system. FIG. 6A shows a configuration of the detection circuit, and FIG. 6B is a diagram showing a relationship between relay output switches in the detection circuit.

  The detection circuit includes fuses 61 to 63 included in the fuse plugs 11 to 13, LEDs 21 and 22 included in the detection display unit 20, a first relay 64, a second relay 65, and a first relay. 64 and a shared voltage adjusting resistor R connected in parallel to the H.64. Both the first relay 64 and the second relay 65 are relays for 200V, for example. The first relay 64 is connected to a fuse 61 connected to the terminal L1 and a fuse 62 connected to the terminal L2. The first relay 64 is connected to the terminal 231 of the alarm output terminal 23. The second relay 65 is connected to a fuse 63 connected to the terminal L3 and a fuse 62 connected to the terminal L2. The second relay 65 is connected to the terminal 232 of the alarm output terminal 23. In FIG. 6B, the output switches 641 and 651 of each relay are in the off state (normal state). Accordingly, the terminals 231 and 232 of the alarm output terminal 23 are in an open state (off state). When either one of the output switches is turned on (short circuit), the terminals 231 and 232 of the alarm output terminal 23 are short circuited (on state). The shared voltage adjusting resistor R is added for the purpose of ensuring that the shared voltage of the relay is lower than its own “relay operating voltage”. In FIG. 6A, the shared voltage adjusting resistor R is added in parallel only to the first relay 64, but it may be added only to the second relay 65, and the first relay 64 and the second relay may be added. You may add to each of 65 in parallel.

(I) Normal operation During normal operation, a voltage of, for example, 200 V is applied between the terminals L1 and L2 on the primary side, and a voltage of, for example, 200 V is applied between the terminals L2 and L3. That is, in the case of the three-phase three-wire system, the voltage between the terminals L1 and L2 on the primary side and the voltage between the terminals L2 and L3 are the same.

  As described above, in a normal time, a voltage (for example, 200 V) higher than the relay operating voltage is applied to both ends of the first relay 64. Therefore, the first relay 64 sets its output switch 641 to the off state. In this state, since current flows through the LED 21, the LED 21 is lit.

  Further, a voltage (for example, 200 V) higher than the relay operating voltage (for example, 80 V) is also applied to both ends of the second relay 65. Therefore, the second relay 65 also turns its output switch 651 off. In this state, since current flows through the LED 22, the LED 22 is lit.

  Since both the output switches 641 and 651 are in the off state, the alarm output terminal 23 is opened, and the alarm output is turned off (that is, no warning signal is output). Further, since the alarm output is off, a remote monitoring device (not shown) connected to the alarm output terminal 23 can recognize that all the fuses 61 to 63 are normal without being cut. .

  Furthermore, since the LEDs 21 and 22 of the detection display unit 20 are lit, it can be confirmed that all the fuses 61 to 63 are normal even at the place where the SPD separator 1 is installed.

(Ii) Operation when the fuse 61 is blown When the fuse 61 is blown, no voltage is applied to both ends of the first relay 64. At this time, the first relay 64 turns on its output switch 641. Further, since no voltage is applied to both ends of the LED 21, no current flows through the LED 21, and the LED 21 is turned off.

  On the other hand, a voltage (200 V) higher than the relay operating voltage (for example, 80 V) is applied to both ends of the second relay 65. At this time, the relay 65 turns its output switch 651 off. Since voltage is applied to both ends of the LED 22, a current flows through the LED 22, and the LED 22 remains lit.

  Although the output switch 651 is in the off state, the output switch 641 is in the on state, so that the alarm output terminal 23 is in a short circuit state and the alarm output is on (that is, an alarm signal is output). . At this time, since the alarm output is on, a remote monitoring device (not shown) connected to the alarm output terminal 23 can recognize that any of the fuses 61 to 63 is disconnected. Note that the monitoring device may display that the fuse is blown or sound a buzzer.

  Further, in the detection display unit 20, since the LED 21 is turned off and the LED 22 is turned on, it is possible to visually confirm that the fuse 61 is disconnected at the place where the SPD separator 1 is installed.

  Even when the fuse 61 is not cut, if the first relay 64 is not applied with a voltage higher than the relay operating voltage, the operation is the same as when the fuse 61 is blown.

(Iii) Operation when the fuse 63 is blown When the fuse 63 is cut, no voltage is applied to both ends of the second relay 65. At this time, the second relay 65 turns its output switch 651 on. Further, since no voltage is applied to both ends of the LED 22, no current flows through the LED 22, and the LED 22 is turned off.

  On the other hand, a voltage (200 V) higher than the relay operating voltage (for example, 80 V) is applied to both ends of the first relay 64. At this time, the relay 64 sets its output switch 641 to the off state. Since voltage is applied to both ends of the LED 21, a current flows through the LED 21, and the LED 21 remains lit.

  The output switch 641 is in the off state, but the output switch 651 is in the on state, so the alarm output terminal 23 is in a short circuit state and the alarm output is on (that is, an alarm signal is output). . At this time, since the alarm output is on, a remote monitoring device (not shown) connected to the alarm output terminal 23 can recognize that any of the fuses 61 to 63 is disconnected. Note that the monitoring device may display that the fuse is blown or sound a buzzer.

  Further, in the detection display unit 20, since the LED 22 is turned off and the LED 21 is turned on, it can be visually confirmed that the fuse 63 is disconnected at the place where the SPD separator 1 is installed.

  Even when the fuse 63 is not cut, if the second relay 65 is not applied with a voltage higher than the relay operating voltage, the operation is the same as when the fuse 63 is blown.

(Iv) Operation when the fuse 62 is blown Even if the fuse 62 is blown, a voltage (200 V) is applied between the terminals L1 to L3 on the primary side, so both ends of the first relay 64 and the second A voltage is applied to both ends of the relay 65. In the case of the three-phase three-wire system, the same voltage (200V) is applied to all the terminals L1 to L3 on the primary side, and both the first relay 64 and the second relay 65 are configured as 200V relays. Therefore, when a circuit configuration similar to that of FIG. 5 is adopted, the voltage (200 V) between the terminals L1 and L3 on the primary side is equally distributed to the two relays. At this time, since the shared voltage, that is, the voltage applied to each relay (for example, 100V) becomes higher than the operating voltage (for example, 80V) of each relay, the first relay 64 and the second relay 65 are normal. Will work.

  Therefore, in the embodiment of the present invention, as shown in FIG. 6, a shared voltage adjusting resistor R is connected in parallel to the first relay 64. By adjusting the value of the resistance R, the voltage applied to the first relay 64 is surely shared lower than the operating voltage of the first relay 64. When the shared voltage of the first relay 64 becomes lower than the operating voltage, the first relay 64 turns its output switch 641 on. In addition, since it is not disconnected between L1-L3, an electric current will flow into LED21. However, when the first relay 64 turns its output switch 641 on, the switch arranged in series with the LED 21 also turns off. For this reason, the LED 21 is turned off.

  On the other hand, a shared voltage adjusting resistor is not connected to the second relay 65. Therefore, the shared voltage applied to both ends of the second relay 65 may be a voltage higher than the relay operating voltage. However, by appropriately setting the value of the shared voltage adjusting resistor R connected in parallel to the first relay 64 (or the value of the resistor connected in series immediately to the first relay 64 and the second value (2) by adjusting the value of the resistor connected in series in the immediate vicinity of the first relay 65 and appropriately setting the value of the shared voltage adjusting resistor R connected in parallel to the first relay 64), the second The voltage shared by the relay 65 can be set lower than the relay operating voltage. In this way, when the shared voltage of the second relay 65 can be set lower than the relay operating voltage, the second relay 65 operates to turn on its own output switch 651. In addition, since it is not disconnected between L1-L3, an electric current will also flow through LED22. However, when the second relay 65 turns its output switch 651 on, the switch disposed in series with the LED 22 is also turned off. For this reason, the LED 22 is also turned off.

  As described above, since both the output switches 641 and 651 are turned on, the alarm output terminal 23 is short-circuited (that is, an alarm signal is output). At this time, since the alarm output is on, a remote monitoring device (not shown) connected to the alarm output terminal 23 can recognize that any of the fuses 61 to 63 is disconnected. Note that the monitoring device may display that the fuse is blown or sound a buzzer. Furthermore, since both the LED 21 and the LED 22 are extinguished in the detection display unit 20, it can be visually confirmed that the fuse 62 is disconnected at the place where the SPD separator 1 is installed.

  In this example, the shared voltage adjusting resistor R is adjusted so that the voltage shared by the second relay 65 is also lower than the relay operating voltage. However, the shared voltage of the second relay 65 is It does not have to be lower than the relay operating voltage. Certainly, in this case, since only the LED 21 is extinguished, it may be determined that the fuse 61 is disconnected. However, since at least one of the fuses 61 and 62 can be visually confirmed, It is not so inconvenient for the person. Even in this case, the distant monitoring device can recognize that any of the fuses 61 to 63 is broken, so that the worker is immediately directed to the installation place of the corresponding SPD separator. There is no inconvenience.

(3) Others FIGS. 5 and 6 describe the detection circuit of the 3-wire SPD separator, but the present invention is not limited to the 3-wire type and can be applied to a 2-line type detection circuit. In this case, since two fuses are provided, the alarm output is turned on when one of the fuses is disconnected, and the LED (in this case, one LED is provided) is turned off. Since the details of the operation are as described above, the description thereof is omitted.

<Monitoring system>
FIG. 7 is a diagram showing a schematic configuration of the monitoring system according to the embodiment of the present invention. The monitoring system 70 is connected via a network 74 to the power source 71, the electrical device 72 to be protected connected to the power source 71, the SPD separator 1, the SPD 73, and the alarm output terminal 23 of the SPD separator 1. And a monitoring device 75 to be operated.

  The monitoring device 75 can be realized by a normal computer. For example, a processor (CPU) 751, a ROM 752 for storing various control data and programs, a RAM 753 used as a calculation area, a keyboard, a pointing device, a voice microphone, and the like Input device 754, an output device 755 such as a display, a printer, and a speaker, and a communication device 756.

  As described above, in the SPD separator 1, if any fuse is disconnected or the voltage across the relay is lower than the relay operating voltage, a warning signal (warning output) for notifying disconnection or voltage drop. Is output from the warning output terminal 23 of the SPD separator 1. This warning signal is transmitted to the monitoring device 75 via the network 74. When the monitoring device 75 receives the transmitted warning signal by the communication device 756, the monitoring device 75 detects the disconnection of the fuse in the SPD separator 1 to be monitored or the abnormality of the voltage drop. .

  By doing so, the operator of the monitoring device 75 can contact the worker in charge of repairing / inspecting the SPD separator 1 and instruct to go to the site. When the monitoring device 75 detects an abnormality as described above, the monitoring device 75 automatically sends an instruction mail (standard mail) to the worker in charge registered in advance to repair and inspect the SPD separator 1. ) May be transmitted.

<Summary>
(I) In the embodiment of the present invention, a power supply circuit is connected to the primary side of the SPD separator, and a plurality of fuses (two or three) connected to the SPD are connected to the secondary side. A detection display unit is connected to the secondary side of the plurality of fuses. The detection display unit includes display means (for example, LED) connected to secondary terminals of a plurality of fuses, and detection means (relay) connected in parallel with the display means. This detection means detects the blow of the fuse, outputs a detection signal for notifying the blow of the fuse, and informs the outside of the fuse cut using the display means (for example, turns off the lit LED). Or reversely turn on the LED that was off). By doing so, it is possible to easily visually check the cutting of the fuse from the outside without having to check the fuse plug of the SPD separator one by one. In addition, by transmitting the output detection signal to the monitoring device via the network, it is possible to remotely recognize the disconnection of the fuse of the SPD separator. Therefore, an operator can be dispatched immediately to the site where the target SPD separator is installed, and the SPD separator can be quickly recovered. In addition, by including the identification number (including ID and information indicating the installation location) of the SPD separator corresponding to the detection signal (alarm output), the monitoring devices are installed in a plurality of locations. This makes it possible to immediately recognize which of the separators for the fuse has a blown fuse or an equipment failure.

  Generally, a 3-wire SPD separator is used, but there may be a 2-wire type. The present invention can also be applied to a two-wire system. In the case of the three-wire system, the number of fuses is three (referred to as first to third fuses). At this time, the first display means (LED) connected to each secondary side terminal of the first fuse and the second fuse, and the secondary side terminal of each of the second fuse and the third fuse Second display means (LED) to be connected is provided. At this time, the detection means includes a first detection means connected in parallel with the first display means and operating to detect the cutting of the first and second fuses, and a second display means. Second detection means connected in parallel and operating to detect the cutting of the second and third fuses is provided. By doing so, it becomes possible to easily recognize from the outside which one of the three fuses has been cut by the display form of the display means.

  In the case of the single-phase three-wire system, the first applied voltage applied between the first and second fuses is lower than the second applied voltage applied between the second and third fuses. Is set. For example, the first applied voltage is set to 100V, and the second applied voltage is set to 200V. A first applied voltage (100 V) relay is used as the first detection means, and a second applied voltage (200 V) relay is used as the second detection means. When the first fuse is cut, 200V is applied only between the second and third fuses, so that the 100V relay is turned on and the first display means (LED) is turned off. When the third fuse is blown, the 200V relay is turned on and the second display means (LED) is turned off. In addition, although it may control by turning on / off by cutting, it may be controlled by turning off / on. On the other hand, when the second fuse is cut, the first applied voltage (100 V) is applied between the first and third fuses. Then, this 100V is shared by the first and second detection means (between the 100V relay and the 200V relay). The shared voltage shared by the first and second detection means is lower than the operating voltage of the first and second relays, respectively. Therefore, the first detection means (100V relay) turns the first display means off, and the second detection means (200V relay) turns the second display means from on to off (off → May be lit). By doing in this way, in the single-phase three-wire SPD separator, it is possible to appropriately detect a blown fuse and / or a malfunction of the device and respond immediately.

  In the case of the three-phase three-wire system, the first applied voltage applied between the first and second fuses and the second applied voltage applied between the second and third fuses have the same value. (For example, 200V). Both 200V relays are used as the first and second detection means. Furthermore, a voltage adjusting resistor R is connected in parallel to the first detecting means (relay). When the first fuse is blown, 200 V is applied only between the second and third fuses, so that the relay of the first detection means is turned on and the first display means (LED) is Turns off. When the third fuse is cut, the relay of the second detection means is turned on, and the second display means (LED) is turned off. In addition, although it may control by turning on / off by cutting, it may be controlled by turning off / on. When the second fuse is cut, 200 V is applied between the first and third fuses, and this applied voltage is shared by the first and second detection means. In this case, at least the shared voltage shared by the relay of the first detection means is a value lower than the operating voltage of the relay, and therefore at least the first detection means (relay) is connected to the first display means (LED). Turn from on to off (may turn on from off). Note that, by appropriately adjusting the value of the voltage adjustment resistor R, the voltage shared by the relay of the second detection means can be set to be lower than the operating voltage of the relay. By doing in this way, in the three-phase three-wire SPD separator, it is possible to appropriately detect a blown fuse and / or a malfunction of the device and respond immediately.

(Ii) The above-described SPD separator is connected to the monitoring device via a network (including wired and wireless). The monitoring device receives an alarm output output from the SPD separator and detects a blown fuse, an abnormality, or a malfunction in the SPD separator. By doing so, it is possible to quickly and efficiently grasp the fuse cutting, abnormality and malfunction in the SPD separators that are remotely distributed and to deal with the malfunction quickly. Become.

(Iii) In the SPD separator, a detection display unit having a plurality of fuse plugs (in the embodiment, three fuse plugs are shown, but there may be two) on the pedestal, and a display unit Is attached. The plurality of fuse plugs and the detection display unit are configured to be detachable from the base. By doing so, when a failure occurs in the SPD separator, it is only necessary to replace the defective component, and it is not necessary to replace the entire device, and it is possible to enjoy a cost advantage. It becomes.

  In addition, a housing grip for gripping the detection display when the detection display is attached or detached is provided on the surface of the housing of the detection display. This housing | casing holding part is comprised by the unevenness | corrugation formed in each of the opposing surface of the direction corresponded with the longitudinal direction of a base, for example. This unevenness is exposed when the detection display unit is mounted on the pedestal. By doing in this way, attachment to the base of a detection display part becomes easy.

  Further, the detection display unit further has a detachable warning output terminal for connection to the network. Since the warning output terminal is detachable, the terminal can be attached to the detection display section after the connection between the network and the terminal is completed. Therefore, even when various devices are installed adjacent to the SPD separator, the connection between the SPD separator and the network can be completed relatively easily.

  Further, the pedestal is formed with a notch groove (may be a guide rail) in the insertion direction of the detection display unit to the pedestal. The detection display unit is formed with a guide rail (a notch groove when the guide rail is formed on the pedestal) so as to face the notch groove of the pedestal. By doing so, the detection display unit can be attached to the base smoothly, and the detection display unit can be more firmly fixed to the base.

  In addition, a notch groove (which may be a guide rail) is formed in the surface of each of the plurality of fuse plugs facing the detection display unit in the direction of insertion into the pedestal. The detection display portion is formed with a guide rail (a notch groove when the guide rail is formed on the fuse plug) so as to face the notch of the pedestal. By doing so, the detection display unit can be attached to the base smoothly, and the detection display unit and the fuse plug, which are separate components, can be more firmly fixed to the base.

1 ... SPD separator 10 ... Pedestal (holder)
DESCRIPTION OF SYMBOLS 11 thru | or 13 ... fuse plug 14,15 ... connection terminal 20 ... detection display part 21,22 ... indicator lamp (LED)
23 ... Alarm output terminals 24, 27 ... Housing gripping parts 51 to 53, 61 to 63 ... Fuses 54, 64 ... First relays 55, 65 ... Second relay 70 ... Monitoring system 71 ... Power source 72 ... Electrical equipment 73 ... SPD
74 ... Network 75 ... Monitoring device

Claims (10)

An SPD separator that shuts off the power line from the power supply circuit to the SPD when an overcurrent is applied,
A plurality of fuses connected to the power supply circuit on the primary side and connected to the SPD on the secondary side;
A detection display unit connected to the secondary side of the plurality of fuses,
The detection display unit
Display means connected to the secondary side terminals of the plurality of fuses;
Detecting means connected in parallel with the display means, detecting the disconnection of the fuse, outputting a detection signal for notifying the disconnection of the fuse, and controlling the display means to notify the disconnection of the fuse; ,
A separator for SPD, comprising: In claim 1,
The number of fuses is three,
The detection display unit
First display means connected to respective secondary terminals of the first fuse and the second fuse;
Second display means connected to the respective secondary side terminals of the second fuse and the third fuse;
First detection means connected in parallel with the first display means and operable to detect the cutting of the first and second fuses;
Second detection means connected in parallel with the second display means and operable to detect the cutting of the second and third fuses;
A separator for SPD, comprising: In claim 2,
A first applied voltage applied between the first and second fuses is set lower than a second applied voltage applied between the second and third fuses;
The first detection means includes a first relay for the first applied voltage,
The second detection means includes a second relay for the second applied voltage,
When the second fuse is blown, (i) the first applied voltage is applied between the first and third fuses, and the first applied voltage is detected by the first and second detections. And (ii) the shared voltages shared by the first and second detection means are lower than the operating voltages of the first and second relays, respectively, and (iii) the first detection Means for turning off the first display means; and (iv) the second detection means turns off the second display means. In claim 2,
The first applied voltage applied between the first and second fuses and the second applied voltage applied between the second and third fuses are set to the same value,
The first detection means includes a first relay for the first applied voltage,
The second detection means includes a second relay for the second applied voltage,
Furthermore, a voltage adjusting resistor is connected in parallel with the first relay,
When the second fuse is blown, (i) the first applied voltage is applied between the first and third fuses, and the first applied voltage is detected by the first and second detections. (Ii) at least the shared voltage shared by the first detection means is lower than the operating voltage of the first relay, and (iii) at least the first detection means An SPD separator, wherein the display means is turned off. Power supply,
An electrical device connected to the power source;
The SPD separator according to any one of claims 1 to 4, which is connected to the power source;
An SPD connected to the SPD separator;
A monitoring device connected to the SPD separator via a network and monitoring an abnormality in the SPD separator;
The SPD separator transmits the detection signal to the monitoring device via the network,
The monitoring system is characterized in that an abnormality in the SPD separator is detected by receiving the detection signal. An SPD separator that shuts off the power line from the power supply circuit to the SPD when an overcurrent is applied,
A plurality of fuse plugs having fuses cut by the overcurrent;
A detection display unit having a display unit and notifying whether or not the fuse is cut;
A pedestal for installing the plurality of fuse plugs and the detection display unit;
The separator for SPD, wherein the plurality of fuse plugs and the detection display unit are configured to be detachable from the pedestal separately. In claim 6,
On the surface of the casing of the detection display unit, an uneven portion is formed on each of opposing surfaces in a direction that coincides with the longitudinal direction of the pedestal, and the uneven portion is exposed in a state where the detection display unit is mounted on the pedestal. An SPD separator characterized by the above. In claim 6 or 7,
The SPD separator, wherein the detection display unit further includes a detachable warning output terminal for connection to a network. In any one of Claims 6 thru | or 8,
The pedestal includes a first notch groove formed in a direction in which the detection display unit is inserted into the pedestal on a surface facing the detection display unit when the detection display unit is mounted on the pedestal, or 1 guide rail,
A second guide rail for sliding the detection display unit along a first notch groove of the pedestal formed in the insertion direction to the pedestal on the housing surface; Or it has the 2nd notch groove for sliding the said detection display part along a said 1st guide rail, The separator for SPD characterized by the above-mentioned. In claim 9,
Each of the plurality of fuse plugs has a third notch groove formed in a direction of insertion of the detection display unit into the pedestal on a surface facing the detection display unit when mounted on the pedestal, or 3 guide rails,
The detection display section is formed on the surface of the housing in the insertion direction to the pedestal, and is a fourth guide rail for sliding the detection display section along a third notch groove of the fuse plug. Alternatively, the SPD separator includes a fourth notch groove for sliding the detection display unit along the third guide rail.

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