JP5468634B2 - Control device for overvoltage protection - Google Patents

Description

  The present invention relates to an overvoltage protection control device that protects indoor electrical devices from surges such as lightning.

  Conventionally, a discharge element such as a varistor is provided in an indoor control cable connected to a connection terminal (secondary terminal or tertiary terminal) of an outdoor transformer. An electrical device such as an indoor relay panel connected to the indoor control cable is protected by being discharged by such a discharge element when a surge such as lightning enters.

  As a technique for protecting indoor electric equipment from the surge as described above, for example, a surge detection device as described in Patent Document 1 has been proposed.

JP 2012-010469 A

  However, in a conventional device for protecting an indoor electric device from a surge, it is necessary to provide a discharge element in each of a large number of indoor control cables connected to connection terminals of an outdoor transformer. Therefore, it is necessary to remove each discharge element when performing the insulation resistance measurement during the periodic inspection, which reduces the efficiency of the inspection work. Moreover, since the discharge element was provided in each indoor control cable, it was difficult to grasp that the discharge element became defective due to the penetration of a surge or the like.

  An object of the present invention is to provide a control device for overvoltage protection that can be easily inspected and can prevent damage to the device.

  The present invention includes a connection terminal connected to an outdoor transformer, an outdoor control cable connected to the connection terminal, an indoor control cable connected to an indoor electrical device, the outdoor control cable, and the indoor control cable. A discharge terminal having one end connected to the relay terminal and the other end connected to the ground, a resistance element provided between the relay terminal and the discharge element, and the relay terminal A voltage relay provided between the discharge element and the resistor element, and a control unit connected to the voltage relay and capable of detecting the operation of the voltage relay. Is operated by a voltage higher than a predetermined value when a voltage higher than a predetermined value is applied to the resistance element via the connection terminal, the indoor control cable and the relay terminal, and the control unit Wherein detecting that the voltage relay actuated, related to the predetermined value or more over-voltage protection control device that counts the number of times the voltage is applied to the resistive element.

  According to this invention, the control device for overvoltage protection includes a relay terminal for connecting the outdoor control cable and the indoor control cable, a discharge element having one end connected to the relay terminal and the other end connected to the ground, and the relay terminal. And a voltage relay provided between the relay terminal and the discharge element and arranged in parallel with the resistance element. Thereby, since the overvoltage protection control device can attach the discharge elements together in one place, the inspection and replacement of the discharge elements during the periodic inspection are facilitated.

  Moreover, the control device for overvoltage protection detects that a voltage exceeding a predetermined value (appropriate overvoltage with a possibility of damaging indoor electrical equipment) is applied to the resistance element, and the overvoltage is applied. Count the number of times. As a result, the control device for overvoltage protection can count the number of times the overvoltage is applied, so that a surge such as lightning enters the outdoor control cable and the like, and the surge is discharged by the discharge element. It can be easily grasped. Further, since the overvoltage protection control device can grasp that the surge has been discharged by the discharge element, it can easily grasp the replacement time of the discharge element. Therefore, the overvoltage protection control device can be easily inspected, and the device can be prevented from being damaged.

The overvoltage protection control device further includes a notification unit that notifies warning information indicating that an overvoltage is applied to the resistance element, and the control unit determines the number of times that a voltage equal to or greater than the predetermined value is applied. It is preferable to perform control so that the warning information is notified by the notification unit while counting.

  Thereby, since the overvoltage protection control device notifies the warning information indicating that the overvoltage has been applied by the notification unit, the worker can easily grasp that the overvoltage has been applied.

  Further, it is preferable that the overvoltage protection control device further includes a switch provided between the relay terminal and the discharge element, which is closed when in use and opened when inspected.

  As a result, the control device for overvoltage protection can be easily inspected regularly by removing the discharge element individually as in the prior art by measuring the insulation resistance by opening the switch during periodic inspection.

  In addition, the control unit indicates that overvoltage protection is performed on the discharge element by the notification unit when the number of times the voltage equal to or greater than the predetermined value is applied is greater than or equal to the predetermined number. It is preferable to control so as to notify the warning information.

  As a result, the control device for overvoltage protection notifies the alarm information for overvoltage protection indicating that measures for overvoltage protection are implemented for the discharge element, so that the worker can perform maintenance of the discharge element, countermeasures against surge intrusion, etc. You can easily know when to do it.

  According to the present invention, it is possible to provide a control device for overvoltage protection that is easy to check and can prevent damage to the device.

It is the schematic which shows the structure of the control apparatus for overvoltage protection which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the inspection and maintenance method of the control apparatus for overvoltage protection which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of an overvoltage protection control device 1 according to an embodiment of the present invention. As shown in FIG. 1, the overvoltage protection control device 1 includes a connection terminal 2, an outdoor control cable 3, a relay terminal block 4, an indoor relay terminal 5, an indoor control cable 6, a relay terminal 7, and a discharge. An element 8, a resistance element 9, a voltage relay 10, a switch 11, a power supply 12, a control unit 13, and a notification unit 14 are provided.

The connection terminal 2 is a secondary terminal or a tertiary terminal of a transformer (not shown) provided outdoors, and is connected to the outdoor control cable 3.
The outdoor control cable 3 is connected to the connection terminal 2 and the relay terminal block 4.
The relay terminal block 4 has an indoor relay terminal 5 and connects the outdoor control cable 3 and the indoor control cable 6.

The indoor relay terminal 5 is connected to the outdoor control cable 3 and the indoor control cable 6. The indoor relay terminal 5 is provided with a discharge element 8, a resistance element 9, and the like, which will be described later.
The indoor control cable 6 is connected to the relay terminal block 4 and the relay terminal 7.
The relay terminal 7 connects the indoor control cable 6 and an indoor relay panel (not shown).

  One end of the discharge element 8 is connected to the indoor relay terminal 5 via the resistance element 9 and the switch 11. The other end of the discharge element 8 is connected to the ground. The discharge element 8 is composed of, for example, a discharge gap and a varistor.

  The resistance element 9 is provided between the indoor relay terminal 5 and the discharge element 8. That is, one end of the resistance element 9 is connected to the indoor relay terminal 5 via the switch 11, and the other end of the resistance element 9 is connected to the discharge element 8. The resistance value of the resistance element 9 is preferably about 100Ω.

  The voltage relay 10 is provided between the switch 11 and the discharge element 8 and is arranged in parallel with the resistance element 9. The voltage relay 10 is turned on when a certain current flows through the resistance element 9. Specifically, the voltage relay 10 is connected to the resistor 9 via the connection terminal 2, the outdoor control cable 3, the indoor relay terminal 5, and the switch 11, that is, an indoor electrical device such as an indoor relay panel. When an overvoltage with a certain degree of possibility of damaging is applied, it operates with a voltage of a predetermined value or more and is turned on.

The switch 11 is provided between the indoor relay terminal 5 and the discharge element 8 and is in a closed state during use (normal time) and in an open state during inspection such as replacement of parts and periodic inspection.
The power supply 12 is connected to the voltage relay 10 and supplies a power supply voltage to the voltage relay 10.

  The control unit 13 is connected to the voltage relay 10 and can detect the operation of the voltage relay. Specifically, the control unit 13 detects that the voltage relay 10 is operated, and counts the number of times that a voltage (overvoltage) of a predetermined value or more is applied to the resistance element 9. The control unit 13 stores the counted number in an internal memory or an external memory (not shown).

  The notification unit 14 is connected to the control unit 13 and reports warning information indicating that an overvoltage is applied to the resistance element 9 under the control of the control unit 13. The alerting | reporting part 14 is comprised by a display and / or a speaker etc., for example, alert | reports alert information by outputting the display which shows a warning, a sound, etc.

  And the control part 13 is controlled so that warning information may be alert | reported by the alerting | reporting part 14, while counting the frequency | count that the voltage more than predetermined value was applied as mentioned above. Thereby, the worker can recognize that the overvoltage is applied to the discharge element 8 and the resistance element 9.

  In addition, the control unit 13 indicates that overvoltage protection is performed by the notification unit 14 on the discharge element 8 when the number of times that a voltage equal to or greater than the predetermined value is applied is greater than or equal to the predetermined number. It may be controlled to notify the warning information. A plurality of stages may be set in the warning information for overvoltage protection.

  For example, when the number of times that a voltage equal to or higher than a predetermined value is applied is X times or more, the control unit 13 notifies the light warning information (for example, warning information for prompting inspection) by the notification unit 14. In addition, when the number of times that the voltage equal to or higher than the predetermined value is applied is Y (Y> X) times or more, the control unit 13 indicates medium warning information (for example, warning information that the discharge element 8 is to be replaced). ) Is notified by the notification unit 14. Further, when the number of times that the voltage of a predetermined value or more is applied is Z (Z> Y) times or more, the control unit 13 provides severe warning information (for example, surge countermeasures (installation of sheath cable, etc.)) Is notified by the notification unit 14.

FIG. 2 is a flowchart illustrating an example of an inspection and maintenance method for the overvoltage protection control device 1.
As shown in FIG. 2, in step S <b> 1, the control unit 13 determines whether or not the number of times that a voltage equal to or higher than a predetermined value is applied is X or more. When the number of times is X or more (YES), the process proceeds to step S2. If the number of times is less than X (NO), the process proceeds to step S1 again.

  In step S <b> 2, the control unit 13 determines whether or not the number of times that a voltage of a predetermined value or more is applied is Y (Y> X) or more. When the number of times is Y or more (YES), the process proceeds to step S5. When the number of times is less than Y (NO), the process proceeds to step S3.

In step S <b> 3, the control unit 13 notifies the light warning information (for example, warning information for prompting inspection) by the notification unit 14.
In step S4, the worker checks the overvoltage protection control device 1. Here, the inspection of the overvoltage protection control device 1 includes, for example, performing insulation resistance measurement with the switch 11 in an open state.

  In step S <b> 5, the control unit 13 determines whether or not the number of times that a voltage of a predetermined value or more is applied is Z (Z> Y) or more. When the number of times is Z or more (YES), the process proceeds to step S8. If the number is less than Z (NO), the process proceeds to step S6.

In step S <b> 6, the control unit 13 notifies medium warning information (for example, warning information indicating that the discharge element 8 is to be replaced) by the notification unit 14.
In step S <b> 7, the worker performs the replacement work of the discharge element 8 with the switch 11 in the open state.

In step S <b> 8, the control unit 13 notifies the warning unit 14 of severe warning information (for example, warning information indicating that another surge intrusion countermeasure (such as installation of a sheath cable) is to be performed).
In step S9, the worker implements surge intrusion countermeasures (installation of a sheath cable, etc.) on the overvoltage protection control device 1.

  In step S10, after the inspection or maintenance is performed in step S4, step S7, or step S9, the control unit 13 closes the switch 11 and resets the number of times that a voltage equal to or greater than the predetermined value is applied. Then, the process returns to step S1 again.

As described above, according to the overvoltage protection control device 1 according to the present embodiment, the following effects can be obtained.
According to the present embodiment, the overvoltage protection control device 1 includes an indoor relay terminal 5 that connects the outdoor control cable 3 and the indoor control cable 6, one end connected to the indoor relay terminal 5, and the other end connected to the ground. The discharge element 8, the resistance element 9 provided between the indoor relay terminal 5 and the discharge element 8, and provided between the indoor relay terminal 5 and the discharge element 8, are arranged in parallel with the resistance element 9. Voltage relay 10. Thereby, since the control apparatus 1 for overvoltage protection can attach the discharge element 8 collectively in one place, the inspection and replacement | exchange of the discharge element 8 at the time of a periodic inspection become easy.

  In addition, the voltage relay 10 applies a voltage of a predetermined value or higher (a certain degree of overvoltage that may damage indoor electrical equipment) to the resistance element 9 via the connection terminal 2, the outdoor control cable 3, and the indoor relay terminal 5. If the voltage relay 10 is activated, the control unit 13 detects that the voltage relay 10 is activated, and counts the number of times that the voltage higher than the predetermined value is applied to the resistance element 9. As a result, the overvoltage protection control device 1 can count the number of times the overvoltage is applied, so that a surge such as lightning enters the outdoor control cable 3 and the like, and the discharge element 8 discharges the surge. Can be easily grasped. Further, since the overvoltage protection control device 1 can grasp that the surge has been discharged by the discharge element 8, it can easily grasp the replacement time of the discharge element 8. Therefore, the overvoltage protection control device 1 can be easily inspected, and the device can be prevented from being damaged.

  In addition, the control unit 13 counts the number of times that a voltage (overvoltage) greater than or equal to a predetermined value is applied, and controls the notification unit 14 to notify the warning information. Thereby, since the control apparatus 1 for overvoltage protection alert | reports the warning information which shows that the overvoltage was applied by the alerting | reporting part 14, the worker can grasp | ascertain easily that the overvoltage was applied.

  The overvoltage protection control device 1 is provided between the indoor relay terminal 5 and the discharge element 8, and includes a switch 11 that is closed when in use and opened when inspected. As a result, the overvoltage protection control device 1 makes it easy to perform periodic inspection because it is not necessary to individually remove the discharge element as in the prior art by measuring the insulation resistance by opening the switch during periodic inspection. .

  Further, the control unit 13 indicates that the notification unit 14 implements measures for overvoltage protection on the discharge element 8 when the number of times that the voltage (overvoltage) of a predetermined value or more is applied is a predetermined number or more. Control is performed so as to notify warning information for overvoltage protection. As a result, the overvoltage protection control device 1 notifies the overvoltage protection alarm information indicating that the overvoltage protection measures are to be taken to the discharge element 8, so that the worker can perform maintenance or surge intrusion on the discharge element 8. It is possible to easily grasp the timing for taking countermeasures.

  As mentioned above, although one Embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

DESCRIPTION OF SYMBOLS 1 Control apparatus for overvoltage protection 2 Connection terminal 3 Outdoor control cable 4 Relay terminal block 5 Indoor relay terminal 6 Indoor control cable 7 Relay terminal 8 Discharge element 9 Resistance element 10 Voltage relay 11 Switch 12 Power supply 13 Control part 14 Notification part

Claims (3)

A connection terminal connected to an outdoor transformer,
An outdoor control cable connected to the connection terminal;
Indoor control cable connected to indoor electrical equipment,
An indoor relay terminal connecting the outdoor control cable and the indoor control cable;
A discharge element having one end connected to the indoor relay terminal and the other end connected to the ground;
A resistance element provided between the indoor relay terminal and the discharge element;
A voltage relay provided between the indoor relay terminal and the discharge element, and arranged in parallel with the resistance element;
A control unit connected to the voltage relay and capable of detecting the operation of the voltage relay;
A switch that is provided between the indoor relay terminal and the discharge element, is closed when in use, and opened when inspected ;
The voltage relay, when a voltage of a predetermined value or more is applied to the resistance element through the connection terminal, the indoor control cable and the indoor relay terminal, operates by the voltage of the predetermined value or more,
The control unit is an overvoltage protection control device that detects that the voltage relay is activated and counts the number of times that a voltage equal to or higher than the predetermined value is applied to the resistance element. A notification unit for notifying warning information indicating that an overvoltage is applied to the resistance element;
2. The overvoltage protection control device according to claim 1, wherein the control unit counts the number of times the voltage equal to or higher than the predetermined value is applied, and controls the notification unit to notify the warning information.   When the number of times that the voltage greater than or equal to the predetermined value is applied is greater than or equal to the predetermined number of times, the control unit performs overvoltage protection for the discharge element by the notification unit. The overvoltage protection control device according to claim 2, wherein control is performed so as to notify warning information.

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