JP6919390B2 - Drawer type vacuum circuit breaker - Google Patents

Description

The present invention relates to a drawer type vacuum breaker capable of monitoring the degree of vacuum of a vacuum valve.

As a drawer type vacuum circuit breaker arranged in the energizing equipment, for example, the device of Patent Document 1 is known.
In the drawer type vacuum circuit breaker of Patent Document 1, the circuit breaker main body mounted on the carriage is housed in the drawer unit provided in the closed switchboard.
The circuit breaker main body includes a vacuum valve having a pair of contact parts that can be connected and detached, and an external terminal connected to the pair of contact parts of the vacuum valve.

In addition, the drawer unit has a connection terminal for the main circuit conductor. The dolly is housed in the drawer unit, and the external terminal of the circuit breaker body is connected to the connection terminal of the main circuit conductor connected to the load device. After setting the operating position, the vacuum valve is closed.
Then, the vacuum valve is quickly extinguished because the arc generated when the pair of contact portions is opened holds the vacuum state.
By the way, in the drawer type vacuum breaker, after opening the vacuum valve, a high voltage is applied between the pair of contact parts, and the leakage current at that time is measured to inspect the occurrence of vacuum leakage. There is.

Japanese Unexamined Patent Publication No. 2007-10823

The work of applying a high voltage to the pair of contact portions of the vacuum valve described above is performed in a state where the carriage is pulled out from the drawer unit (maintenance position) after the energization of the load device is stopped. Therefore, it is not possible to immediately confirm that the degree of vacuum has dropped in the vacuum valve of the vacuum breaker while the load device is energized.
Therefore, the present invention provides a drawer-type vacuum circuit breaker capable of constantly monitoring the vacuum state of a vacuum valve so that ground faults and short circuits can be reliably prevented even while the load device is energized. The purpose is.

In order to achieve the above object, the vacuum circuit breaker according to one aspect of the present invention is mounted on a drawer unit arranged in a closed switchboard, a moving body that can be stored in the drawer unit, and a moving body. The circuit breaker body has a circuit breaker body, and the circuit breaker body is fixed to a vacuum valve having a pair of contactable contact portions mounted on a moving body and a pair of contact portions of the vacuum valve. The drawer unit is equipped with an external terminal, and the main circuit connection terminal that connects to the external terminal when the moving body is housed is arranged, and a non-contact temperature sensor that measures the outer surface temperature of the vacuum valve in a non-contact manner. The non-contact temperature sensor is provided with a vacuum degree determining means for determining the vacuum degree of the vacuum valve based on the measured value of the non-contact temperature sensor, and the non-contact temperature sensor faces the vacuum valve when the moving body is housed. As described above, the drawer unit is arranged at a predetermined position.

According to the drawer type vacuum circuit breaker according to the present invention, the vacuum state of the vacuum valve can be constantly monitored so that ground faults and short circuits are surely prevented even while the load device is energized. ..

It is a facility electric circuit diagram including a drawer type vacuum circuit breaker. It is a figure which shows the circuit breaker main body which comprises the drawer type vacuum circuit breaker of 1st Embodiment which concerns on this invention. It is a figure which shows the drawer unit which comprises the drawer type vacuum circuit breaker of 1st Embodiment which concerns on this invention. It is a figure which shows the state which the circuit breaker main body is housed in the drawer unit of 1st Embodiment which concerns on this invention. It is a block diagram which shows the vacuum degree determination means of the drawer type vacuum breaker of 1st Embodiment which concerns on this invention. It is a flowchart which shows the control performed by the vacuum determination means. It is a figure which shows the state which the circuit breaker main body is housed in the drawer unit of the 2nd Embodiment which concerns on this invention.

Next, the first and second embodiments of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.

Further, the first and second embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is based on the material of a component. The shape, structure, arrangement, etc. are not specified as follows. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

[Electrical circuit diagram of load device and vacuum circuit breaker]
FIG. 1 shows a facility electric circuit diagram including a drawer type vacuum circuit breaker according to the present invention.
FIG. 1 shows a case where it is used for a single phase, and reference numeral 1 is a load device.
Reference numeral 4 is a load-side conductor connected to the load device 1, and a load-side terminal 5 as a main circuit connection terminal is connected to the load-side conductor 4. Further, reference numeral 6 is a power supply side conductor, and a power supply side terminal 7 as a main circuit connection terminal is connected to the power supply side conductor 6.
Then, the drawer type vacuum circuit breaker 10 of the first embodiment is connected to the load side terminal 5 and the power supply side terminal 7.

[Drawer type vacuum circuit breaker of the first embodiment]
The drawer type vacuum circuit breaker 10 of the first embodiment (hereinafter, simply referred to as the vacuum circuit breaker 10) will be described with reference to FIGS. 2 to 6.
The vacuum circuit breaker 10 of the first embodiment includes a circuit breaker main body 12 mounted on a carriage 11 as a moving body shown in FIG. 2 and a drawer unit 13 shown in FIG.

As shown in FIG. 2, the circuit breaker main body 12 includes a vacuum valve 15, a pair of external terminals 16 and 17, and a valve operating unit 18 for opening and closing the vacuum valve 15.
The vacuum valve 15 is fixed to the operation unit housing 18a of the valve operation unit 18 via a holding metal fitting 19, and is a vacuum container 20, a fixed contact 21 as a pair of contact portions built in the vacuum container 20, and a fixed contact 21. It is composed of a movable contact 22.

The movable direction of the movable contact 22 of the vacuum valve 15 is the vertical direction, and one external terminal 16 is fixed to the fixed contact 21 located above the movable contact 22, and the position below the one external terminal 16. The other external terminal 17 fixed to the movable contact 22 is arranged therein.
The valve operation unit 18 is provided with an operation button (not shown) on the outside of the operation unit housing 18a, and a drive spring (not shown) and a part of the link mechanism 26 are built in the operation unit housing 18a. ing. The link mechanism 26 is connected to the movable contact 22 of the vacuum valve 15, and the movable contact 22 of the vacuum valve 15 is opened by rotating the link mechanism 26 by the spring force of the drive spring by operating the operation button. Or, it closes.

The drawer unit 13 is arranged in a closed switchboard, and as shown in FIG. 3, a terminal holder for holding the traveling path 28 on which the carriage 11 travels and the load side terminal 5 and the power supply side terminal 7 described above in the vertical position. A section 29 and a section 29 are arranged. The terminal holding portion 29 holds the load side terminal 5 and the power supply side terminal 7 with the holding metal fitting 31 via the insulator 30.
Here, as shown in FIG. 2, the non-contact temperature sensor 33 is arranged at a position facing the surface of the vacuum vessel 20 of the vacuum valve 15 in the operation unit housing 18a of the circuit breaker main body 12, and is not. A vacuum degree determination device 34 for inputting temperature data measured by the contact temperature sensor 33 is arranged.

As shown in FIG. 5, the vacuum degree determination device 34 includes a control unit 35, a recording unit 36, a monitor 37, and an alarm unit 38.
The control unit 35 includes a CPU 35a, a ROM 35b, a RAM 35c, an input port 35d, and an output port 35e.
The CPU 35a is a central arithmetic processing unit, and controls and operates by arithmetic processing stored in ROM 35b, which is a read-only semiconductor memory.

The RAM 35c is a high-speed readable and writable semiconductor memory, and temporarily stores data necessary for the operation of the CPU 35a.
Data on the surface temperature of the vacuum vessel 20 of the vacuum valve 15 measured by the non-contact temperature sensor 33 is input to the input port 35d (see FIGS. 2 and 4).
The output port 35e is connected to the recording unit 36, the monitor 37, and the alarm unit 38.

The recording unit 36 has data on the surface temperature of the vacuum vessel 20 measured by the non-contact temperature sensor 33 calculated by the control unit 35, and a vacuum of the vacuum vessel 20 stored in advance corresponding to the data of the surface temperature. Recorded data with the state is input. Further, on the monitor, the data of the surface temperature of the vacuum vessel 20 currently measured by the non-contact temperature sensor 33 displays on the screen whether or not the vacuum state of the vacuum vessel 20 is maintained.

The alarm unit 38 issues an alarm buzzer or an alarm display informing that a leak has occurred in the vacuum vessel 20 when a flag for issuing an alarm calculated by the control unit 35 is input.
Next, the arithmetic processing performed by the control unit 35 will be described with reference to FIG.
The control unit 35 performs a temperature measurement process in step ST10, then a vacuum degree estimation process in step ST20, and then a determination process in step ST30. Further, after step ST30, the control unit 35 performs recording processing in step ST40, and then performs alarm generation processing in step ST50.

In the temperature measurement process of step ST10, the data of the surface temperature of the vacuum vessel 20 measured by the non-contact temperature sensor 33 is input and converted into a digital value.
Next, in the vacuum degree estimation process in step ST20, the surface temperature data of the vacuum vessel 20 measured by the non-contact temperature sensor 33 and the vacuum vessel 20 stored in advance at the time of vacuum or in the vacuum state change. It is a process to compare with the temperature data at the time of operation.

Next, in the determination process of step ST30, the vacuum state of the vacuum vessel 20 in which the surface temperature data of the vacuum vessel 20 measured by the non-contact temperature sensor 33 in the vacuum degree estimation process of step ST20 is stored in advance. When it matches the predetermined temperature data when the value drops to the predetermined value, it is determined that the vacuum vessel 20 has leaked.
Next, in the recording process of step ST40, the data of the surface temperature of the vacuum vessel 20 measured by the non-contact temperature sensor 33 and the vacuum state of the vacuum vessel 20 stored in advance corresponding to the data of the surface temperature. Is output as recorded data.

Next, in the alarm generation process of step ST50, a flag for issuing an alarm is output when it is determined in the determination process of step ST30 that a leak has occurred in the vacuum vessel 20.
Next, the operation of the vacuum circuit breaker 10 of the first embodiment will be described with reference to FIG.
The carriage 11 of the circuit breaker main body 12 arranged at the maintenance position runs on the traveling path 28 of the drawer unit 13 arranged in the closed switchboard, and the load side terminal 5 and the power supply side terminal 7 of the drawer unit 13 run. A pair of external terminals 16 and 17 of the circuit breaker main body 12 are connected to the circuit breaker body 12. As a result, the vacuum circuit breaker 10 of the first embodiment is arranged in the energizing path of the load device 1 as shown in FIG.

Further, after closing the vacuum valve 15 by operating the valve operating unit 18, the load device 1 is energized.
Then, while the load device 1 is energized, the vacuum degree determination device 34 of the vacuum breaker 10 measures the outer surface temperature of the vacuum container 20 of the vacuum valve 15 using the non-contact temperature sensor 33.
The control unit 35 of the vacuum circuit breaker 10 inputs the data of the outer surface temperature of the vacuum vessel 20 measured by the non-contact temperature sensor 33 and converts it into a digital value. Then, the data of the outer surface temperature of the vacuum vessel 20 measured by the non-contact temperature sensor 33 is compared with the temperature data of the vacuum vessel 20 stored in advance at the time of vacuum or when the vacuum state is changing. do.

Here, the fixed contact 21 and the movable contact 22 of the vacuum valve 15 do not deteriorate in vacuum, but when a vacuum leak occurs and the atmosphere enters the vacuum container 20, the fixed contact 21 and the movable contact are formed. An oxide film is formed on the contact surface of 22 to increase the contact resistance. When an electric current flows through the fixed contact 21 and the movable contact 22 in this state, the heat generated on the contact surface where the oxide film is generated increases, and the surface temperature of the vacuum vessel 20 also rises.

Then, the data of the elevated outer surface temperature of the vacuum vessel 20 measured by the non-contact temperature sensor 33 coincides with the predetermined temperature data when the vacuum state of the vacuum vessel 20 stored in advance drops to a predetermined value. At that time, it is determined that a vacuum leak has occurred in the vacuum container 20, and the alarm unit 38 issues an alarm buzzer or an alarm display informing that the vacuum container 20 has a leak.

As described above, in the vacuum breaker 10 of the first embodiment, the vacuum degree determination device 34 has a vacuum leak in the vacuum valve 15 based on the measurement data of the outer surface temperature of the vacuum vessel 20 of the vacuum valve 15. Can be confirmed immediately. Therefore, even while the load device 1 is being energized, the vacuum state of the vacuum valve 15 can be constantly monitored so that ground faults and short circuits are surely prevented.
Further, in the vacuum breaker 10 of the first embodiment, since the non-contact temperature sensor 33 measures the temperature of the outer surface of the vacuum container 20 in a non-contact state, a contact type in which a thermocouple or the like is brought into contact with the vacuum container 20. It can solve the problem of electrical insulation compared to the measurement of.

[Drawer type vacuum circuit breaker of the second embodiment]
Next, FIG. 7 shows the vacuum circuit breaker 10 of the second embodiment. The same components as those shown in FIGS. 1 to 6 are designated by the same reference numerals, and the description thereof will be omitted.
The difference between the vacuum circuit breaker 10 of the second embodiment and the apparatus of the first embodiment is that the non-contact temperature sensor 33 and the vacuum degree determination device 34 are arranged in the terminal holding portion 29 of the drawer unit 13. .. Then, the carriage 11 of the circuit breaker main body 12 arranged at the maintenance position runs on the traveling path 28 of the drawer unit 13, and a pair of the circuit breaker main body 12 is connected to the load side terminal 5 and the power supply side terminal 7 of the drawer unit 13. The non-contact temperature sensor 33 is arranged so as to face the outer surface of the vacuum container 20 of the vacuum valve 15 when the external terminals 16 and 17 of the above are connected.

Also in the vacuum breaker 10 of the second embodiment, the vacuum degree determination device 34 of the vacuum breaker 10 uses the non-contact temperature sensor 33 while the load device 1 is energized, and the outer surface of the vacuum container 20 of the vacuum valve 15 is used. Measure the temperature.
Then, the data of the increased outer surface temperature of the vacuum vessel 20 measured by the non-contact temperature sensor 33 coincided with the predetermined temperature data when the vacuum state of the vacuum vessel 20 stored in advance decreased to a predetermined value. Occasionally, it is determined that a vacuum leak has occurred in the vacuum container 20, and the alarm unit 38 issues an alarm buzzer or an alarm display informing that the vacuum container 20 has a leak.

As described above, also in the vacuum breaker 10 of the second embodiment, the vacuum degree determination device 34 has a vacuum leak in the vacuum valve 15 based on the measurement data of the outer surface temperature of the vacuum vessel 20 of the vacuum valve 15. Can be confirmed immediately. Therefore, even while the load device 1 is being energized, the vacuum state of the vacuum valve 15 can be constantly monitored so that ground faults and short circuits are surely prevented.
Further, also in the vacuum breaker 10 of the second embodiment, since the non-contact temperature sensor 33 measures the temperature of the outer surface of the vacuum container 20 in a non-contact state, a contact type in which a thermocouple or the like is brought into contact with the vacuum container 20. It can solve the problem of electrical insulation compared to the measurement of.

1 Load device 4 Load side conductor 5 Load side terminal 6 Power supply side conductor 7 Power supply side terminal 10 Vacuum circuit breaker 11 Carriage 12 Circuit breaker body 13 Drawer unit 15 Vacuum valve 16, 17 External terminal 18 Valve operation unit 18a Operation unit housing 19 Holding metal fitting 20 Vacuum container 21 Fixed contact 22 Movable contact 26 Link mechanism 28 Running path 29 Terminal holding part 30 碍 31 Holding metal fitting 33 Non-contact temperature sensor 34 Vacuum degree judgment device 35 Control unit 36 Recording unit 37 Monitor 38 Alarm unit 35a CPU
35b ROM
35c RAM
35d input port 35e output port

Claims (1)

With the drawer unit located in the closed switchboard,
A moving body that can be stored in the drawer unit and
It has a circuit breaker body mounted on the moving body, and has
The circuit breaker body
A vacuum valve with a built-in pair of contact points that can be attached and detached mounted on the moving body,
An external terminal fixed to the pair of contacts of the vacuum valve.
The drawer unit is provided with a main circuit connection terminal that connects to the external terminal when the moving body is housed, and also has a main circuit connection terminal.
A non-contact temperature sensor that measures the outer surface temperature of the vacuum valve in a non-contact manner,
It is provided with a vacuum degree determining means for determining the vacuum degree of the vacuum valve based on the measured value of the non-contact temperature sensor.
The non-contact temperature sensor is a drawer-type vacuum breaker, which is arranged at a predetermined position of the drawer unit so as to face the vacuum valve when the moving body is housed.

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