JPH0787631A - Distribution board withstand voltage test method and withstand voltage test cart - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the possibility of electric shock by enabling the withstand voltage test of the main circuit of the switchboard so that humans do not come into direct contact with the main circuit. A test contactor 11A having the same shape and arranged at the same position as a contactor of a drawer type circuit breaker housed in a frame 1 of a switchboard, and a high voltage terminal 12 conductively connected to the contactor 11A are provided. A high voltage is applied to the high voltage terminal 12 from the high voltage power source 6 in a state where the high voltage terminal 12 is placed on a trolley, housed in a switchboard, and in contact with the main circuit 2A and the test contact 11A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for conducting a withstand voltage test against a main circuit of a switchboard in which a drawer type circuit breaker is housed.

[0002]

2. Description of the Related Art When a main circuit in a switchboard is installed or inspected, the withstand voltage withstand performance on the load side is tested to see if the circuit is defective. With respect to the switchboard containing the drawer type circuit breaker, the drawer type device is once drawn out, and a withstand voltage test is performed by applying an AC high voltage to the main circuit wired in the back.

FIG. 9 is a side view showing the construction of a drawer type circuit breaker housed in a switchboard. The drawer type circuit breaker 40 has a structure in which an unillustrated vacuum circuit breaker is built in an insulating frame 5 placed on the trolley 4, and the main circuit 2
It is provided with contacts 3A and 3B connected to A and 2B, respectively. The trolley | bogie 4 is equipped with the circuit breaker operating mechanism which is not illustrated inside, and can move in the frame 1 of a switchboard left and right. Normally, a plurality of drawer type circuit breakers 40 are housed in a switchboard, and the frames 1 are arranged in a plurality of stages at the top and bottom of FIG. The main circuits 2A and 2B are connected to a bus bar (not shown) running vertically. It should be noted that FIG. 9 is a view of the switchboard viewed from the side cover. Further, in FIG. 9, the main circuits 2A and 2B are three-phase circuits, and the contact 3
In addition to A and 3B, the other phases are arranged in a direction perpendicular to the paper surface.

FIG. 10 is a side view showing a construction in which the drawer type circuit breaker of FIG. 9 is disconnected from the main circuit. The only difference from FIG. 9 is that the carriage 4 is pulled out to the left and the contacts 3A, 3B are disconnected from the main circuits 2A, 2B. As will be described later, when carrying out a withstand voltage test of the main circuits 2A and 2B of the switchboard, the drawer type circuit breaker 40 is further pulled leftward from the frame 1. Frame 1 in that state
A high voltage is applied to the main circuits 2A and 2B at the back of the.

FIG. 11 is a side view showing a conventional withstand voltage test method for a switchboard. A high-voltage-side lead 8 of a high-voltage power supply 6 whose one end is connected to a ground 7 is stretched in the frame 1 from which the drawer type circuit breaker has been removed, and is connected to the upper main circuit 2A. At that time, the main circuit of the other phase is connected to the ground 7 through a lead (not shown). In the state shown in FIG. 11, a high voltage is generated in the high voltage power source 6 and a withstand voltage test against ground of the main circuit 2A is performed.

FIG. 12 is a side view showing a conventional withstand voltage test method for different switchboards. What is different from FIG. 1 is the lead 8
Is only connected to the lower main circuit 2B. In the state of FIG. 12, a high voltage is generated in the high voltage power source 6 to generate the main circuit 2B.
The withstand voltage test against ground is carried out.

[0007]

However, the conventional device as described above has a problem in that a person may get an electric shock because a lead is connected. The withstand voltage test of the switchboard may be necessary even when one of the upper and lower main circuits is active. That is, when changing or adding a circuit on the load side, the main circuit on the power receiving side is often in a live state, and a withstand voltage test of only the main circuit on the load side is often required. At that time, if an operator mistakenly connects the lead to the main circuit in the live-line state by hand, serious injury may be caused.

An object of the present invention is to eliminate the possibility of electric shock by eliminating the need for humans to directly contact the main circuit.

[0009]

In order to achieve the above-mentioned object, according to the method of the present invention, an electric device equipped with a contactor is placed on and taken out of a trolley, and the inside of the contactor and the switchboard are removed. A method for conducting a withstand voltage test against the main circuit of a switchboard that houses a drawer type device that comes in and out of contact with the main circuit, and after pulling out the drawer type device, it is placed in the same shape and at the same position as the contact. A test contactor and a high-voltage terminal electrically conductively connected to the test contactor were placed on a dolly, and a withstand voltage test carriage was housed in the switchboard, and the main circuit and the test contactor were brought into contact with each other. In this state, a high voltage is applied to the high voltage terminal from a high voltage power supply.

A device for carrying out the above-mentioned method, wherein the test contact has the same shape and the same position as the contact of the drawer type device accommodated in the switchboard, and the test contact A high voltage terminal electrically conductively connected is placed on a trolley, and a high voltage is applied from a high voltage power source to the high voltage terminal in a state where it is housed in a switchboard and the main circuit and test contact are in contact with each other. And

In such a structure, it is assumed that a high-voltage power supply connected to the high-voltage terminal and generating a high voltage is built in, or a ground terminal is built-in.

[0012]

According to the structure of the present invention, the withstand voltage test carriage has the same shape as the contact of the drawer type equipment and is arranged at the same position, and the high voltage terminal electrically conductively connected to the contact. It is composed of and mounted on a trolley. Withdraw the withstand voltage test carriage and disconnect the test contact from the main circuit, and connect the high-voltage power supply to the high-voltage terminal. A withstand voltage test carriage is housed in a switchboard, and a high voltage is applied to a high voltage terminal from a high voltage power supply in a state where the main circuit and a test contact are in contact with each other. This eliminates the possibility of electric shock because the worker does not directly touch the main circuit.

Further, in such a structure, since the high voltage power supply is built in the withstand voltage test carriage, the high voltage portion is not exposed to the outside, and the test becomes safer. Further, in such a configuration, since the ground terminal is built in the withstand voltage test carriage, the work of grounding the main circuit of the other phase becomes very easy.

[0014]

EXAMPLES The present invention will be described below based on examples.
1A and 1B are views showing the configuration of a withstand voltage test carriage for a switchboard according to an embodiment of the present invention, FIG. 1A is a side view, and FIG. 1B is a view taken in the direction of arrow P in FIG. 1A. In FIG. 1 (A), an insulating frame 10 having a test contactor 11A is mounted on a carriage 9. The dolly 9 includes a high-voltage terminal 12 and a ground terminal 14 inside, and the high-voltage terminal 12 and the test contactor 11A.
Are connected via the lead 16. Also, trolley 9
Has a window at the front (left side) and is covered with a window cover 13. In FIG. 1 (B), the high voltage terminal 12 is a three phase three
They are arranged on a table and connected to three test contacts (not shown) at the back via leads 16. The window cover 13 can be opened and closed on the front side via a hinge 18. Further, the ground terminal 14 is fixed inside the carriage 9 and is connected to the lower ground shoe 19 via the lead 15.

In FIG. 1A, the bogie 9 and the insulating frame 10 have the same outer shapes as the bogie 4 and the insulating frame 5 of the drawer type circuit breaker 40 shown in FIG. But,
The operating mechanism and the circuit breaker are not arranged inside the carriage 9 and the insulating frame 10. The test contactor 11A also has the same shape as the contactor 3A of FIG. 9 and is arranged at the same position. Further, the ground shoe 19 is made of copper foil and is flexible. Ground shoe 19 is trolley 9
Even if is slid, it is always in contact with the ground rail 20 attached to the frame 1 side.

FIG. 2 is a side view showing a state in which the truck of FIG. 1 is housed in the frame of the switchboard. The high-voltage side lead 8 of the high-voltage power supply 6 whose one end is connected to the ground 7 penetrates the opened window of the window cover 13 and is connected to the high-voltage terminal 12.
The high-voltage terminal of the other phase is connected to the ground terminal 14 via a lead (not shown). On the other hand, test contact 11A
Is the same as the contact of the draw-out type circuit breaker, so it contacts the main circuit 2A.

The connection work between the lead 8 and the high-voltage terminal 12 in FIG. 2 is performed with the dolly 9 pulled out to the left, that is,
This is performed when the test contact 11A and the main circuit 2A are disconnected. After that, the trolley 9 is slid to the right to bring it to the state shown in FIG. The main circuit of the other phase is grounded by the ground rail 20 via the ground terminal 14. Since the withstand voltage test is performed in this manner, the worker does not directly touch the main circuit 2B. Therefore, even if the main circuit 2B is used, there is no possibility of electric shock even if the main circuit 2B is in a live state, and it is safe. Further, since the grounding terminal 14 is arranged inside the trolley 9, the grounding work for the other phase becomes very easy.

FIG. 3 is a diagram showing the structure of a withstand voltage test carriage for a switchboard according to a different embodiment of the present invention.
3B is a side view, and FIG. 3B is a view on arrow Q in FIG. Figure 3
In (A), the high voltage terminal 12 is connected to the test contact 11B via the lead 17. Other configurations are the same as those in FIG. The test contactor 11B has the same shape as the contactor 3B of the draw-out type circuit breaker 40 in FIG. 9 and is arranged at the same position.

FIG. 4 is a side view showing a state in which the carriage of FIG. 3 is housed in the frame of the switchboard. Test contact 1
Since 1B is the same as the contact of the drawer type circuit breaker, it is in contact with the main circuit 2B. Other configurations and test methods are the same as those in FIG. Therefore, the worker does not directly touch the main circuit 2A. Therefore, even if the main circuit 2A is used, there is no possibility of electric shock even in a live state, and it is safe.

FIG. 5 is a diagram showing the structure of an electric strength test carriage for a switchboard according to a further different embodiment of the present invention.
5A is a side view, and FIG. 5B is a view taken in the direction of arrow R in FIG. In FIG. 5A, the trolley 9 has a built-in high-voltage power supply 6. Further, in FIG. 5B, the ground side of the high voltage power supply 6 is connected to the ground shoe 19. Other configurations are the same as those in FIG.

FIG. 6 is a side view showing a state in which the truck of FIG. 5 is housed in the frame of the switchboard. The lead 8 on the high voltage side of the high voltage power supply 6 is connected to the high voltage terminal 12. Other configurations are the same as those in FIG. 2, and the test method is also the same. Therefore, the operator does not directly touch the main circuit 2B, and since the lead 8 is inside the carriage 9, there is no possibility of touching the lead 8 during the test, and safety is further increased.

FIG. 7 is a diagram showing the structure of a withstand voltage test carriage for a switchboard according to a further different embodiment of the present invention.
FIG. 7A is a side view, and FIG. 7B is a view on arrow S in FIG. 7 differs from FIG. 3 only in that the trolley 9 has a built-in high-voltage power supply 6. FIG. 8 is a side view showing a state in which the carriage of FIG. 7 is housed in the frame of the switchboard. The lead 8 on the high voltage side of the high voltage power supply 6 is connected to the high voltage terminal 12. Other configurations are the same as those in FIG. 4, and the test method is also the same. Therefore, the operator does not directly touch the main circuit 2A, and there is no possibility of touching the lead 8 during the test, which further increases safety.

[0023]

As described above, according to the present invention, since the contactor has the same shape as that of the drawer type device and is arranged at the same position, the operator does not directly touch the main circuit, which may cause electric shock. lost. Moreover, since the withstand voltage test cart is simply put in and out, the wiring work during the withstand voltage test becomes easy.

Also in this structure, the high-voltage power supply is built in the carriage, so that the high-voltage portion is not exposed to the outside, and the safety is further improved. In addition, the high voltage power source is no longer needed and it is no longer necessary to secure a withstanding voltage test site. Furthermore, the withstand voltage test of the main circuit at another position can be performed by moving only the withstand voltage test carriage, which facilitates the test.

Further, in such a structure, the grounding terminal is built in the carriage, so that the work of grounding the main circuit of the other phase becomes very easy.

[Brief description of drawings]

1A and 1B are views showing a configuration of a withstand voltage test carriage for a switchboard according to an embodiment of the present invention, in which FIG. 1A is a side view and FIG.
(A) P arrow view

FIG. 2 is a side view showing a state where the trolley in FIG. 1 is stored in a frame of a switchboard.

3A and 3B are views showing a configuration of a withstand voltage test carriage for a switchboard according to another embodiment of the present invention, in which FIG. 3A is a side view and FIG.
Is a view from the arrow Q in FIG.

FIG. 4 is a side view showing a state where the trolley in FIG. 3 is stored in a frame of a switchboard.

FIG. 5 is a diagram showing a configuration of a withstand voltage test carriage for a switchboard according to a further different embodiment of the present invention, (A) is a side view,
FIG. 5B is a view on arrow R of FIG.

FIG. 6 is a side view showing a state where the trolley in FIG. 5 is stored in a frame of a switchboard.

FIG. 7 is a diagram showing a structure of a withstand voltage test carriage for a switchboard according to a further different embodiment of the present invention, (A) is a side view,
7B is a view as seen from the arrow S in FIG.

8 is a side view showing a state in which the trolley in FIG. 7 is stored in a frame of a switchboard.

FIG. 9 is a side view showing a configuration of a drawer type circuit breaker housed in a switchboard.

FIG. 10 is a side view showing a state in which the drawer type circuit breaker of FIG. 9 is disconnected from the main circuit.

FIG. 11 is a side view showing a conventional withstand voltage test method for a switchboard.

FIG. 12 is a side view showing a conventional withstand voltage test method for different switchboards.

[Explanation of symbols]

1: frame, 2A, 2B: main circuit, 11A, 11B:
Test contact, 6: high voltage power supply, 7: ground, 8, 15, 1
6, 17: lead, 9: dolly, 10: insulating frame, 1
2: high voltage terminal, 13: window cover, 14: ground terminal, 18: hinge, 19: ground shoe, 20: ground rail

Claims (4)

[Claims] 1. A main circuit of a switchboard which houses a drawer and an electric device equipped with a contactor which is placed on a trolley and put in and taken out from the contactor and a main circuit inside the switchboard. A method of performing a test, after pulling out the drawer type device, a test contact having the same shape and arranged at the same position as the contact, and a high-voltage terminal conductively connected to the test contact. A withstand voltage test carriage mounted on a trolley is stored in a switchboard, and a high voltage is applied from a high-voltage power supply to a high-voltage terminal in a state where the main circuit and the test contact are in contact with each other. Withstanding voltage test method. 2. An apparatus for carrying out the method according to claim 1, wherein a test contactor having the same shape and arranged at the same position as the contactor of the drawer type equipment housed in a switchboard, and the test contactor A high-voltage terminal electrically conductively connected to the contact is placed on the trolley, and a high voltage is applied from the high-voltage power supply to the high-voltage terminal with the main circuit and the test contact kept in contact with each other in the distribution board. A withstand voltage test trolley for a switchboard. 3. A withstand voltage test trolley for a switchboard according to claim 2, further comprising a high-voltage power supply connected to the high-voltage terminal and generating a high voltage. 4. A withstand voltage test carriage for a switchboard according to claim 2 or 3, wherein a ground terminal is built in.