JP5649604B2 - Key interlock method for switchboard - Google Patents

Description

  The present invention relates to a key interlock method for a switchboard, and in particular, the panel can be opened only when the section in the switchboard is operated with no voltage, and the circuit breaker is turned on when the panel is open. The present invention relates to a key interlock method for a switchboard that has been disabled.

Interlocks are usually used for switchboards, and are designed for safety during maintenance. Panels can be opened only when the working area is non-voltage, and Designed so that the circuit breaker cannot be turned on.

  The basic concept of this switchboard interlock is as follows. That is, in the maintenance of the distribution board, as shown in FIG. 1, the No. 1 and No. 4 bus connection board 1, the grounded instrument transformer board 2, the generator board 3, and the transformer as shown in FIG. Electrical path between feeder panel 4, 1 and 2 bus connection board 5 and No. 2 board 4 and 1 bus connection board 6 (A), No. 1 and No. 3 board 2 and 1 bus connection board 7 Since there is a possibility that the electric circuit (B) and the electric circuit (C) between the No. 1 board and the No. 1 generator 8 may be live lines, these electric circuits should be securely cut off and grounded. It is necessary to keep. In FIG. 1, reference numeral 9 denotes a No. 1 excitation board.

  The other is to provide an electrical / mechanical interlock mechanism so that the circuit breaker is not accidentally turned on by a remote operation or an erroneous operation due to a human error in the interruption and grounding state.

  As a prior art of such an interlock device for a switchboard, for example, there are those described in Patent Documents 1 and 2.

  In Patent Document 1, when opening the door of a circuit breaker installed in the panel, the lock is released by turning the operation handle of the handle unit to the OFF position to turn off the breaker, and the handle position is turned ON. In the state, it is described that the door is not opened.

  On the other hand, in Patent Document 2, the operation handle mounting portion for operating the target circuit breaker can be operated only after the key switch of the operation device for the plurality of pull-out type circuit breakers operated in linkage is operated. Have been described.

JP 2001-345037 A JP 59-132706 A

  However, in the above-mentioned Patent Documents 1 and 2, in the maintenance of the switchboard, the circuit of each panel is surely cut off and grounded, and in the cut-off and grounded state, the circuit breaker is mistakenly caused by remote operation or erroneous operation due to human error. However, no consideration has been given to avoiding the introduction of, and a safer interlock method has been desired.

  The present invention has been made in view of the above points. The purpose of the present invention is to reliably shut off and ground the electrical circuit of each panel in maintenance of the distribution panel, and to reliably perform remote control in the blocked and grounded state. Another object of the present invention is to provide a key interlock method for a switchboard that prevents a circuit breaker from being erroneously inserted due to an erroneous operation due to a human error.

  In order to achieve the above object, the key interlock method for a distribution board according to the present invention comprises at least No. 1 to No. 3 boards, the No. 1 board is formed of a plurality of boards, and the No. 1 to 3 boards are electrically When the circuit between the connected panels is cut off and grounded, the first board removes the key 1 of the first board with the breaker operation switch of the first board disconnected. The breaker operation switch of No. 2 board adjacent to one side is disconnected, and in this state, the key 3 of the No. 2 board is removed, and the key 3 of the No. 2 board and the key 1 of the No. 1 board are removed. Inserting into the key switch of the No. 2 board and setting it in the maintenance state, in this state, the earthing switch operation switch of the No. 2 board is grounded, the electric circuit of the No. 1 board and the No. 2 board are grounded, and the No. 2 The key 5 on the panel is removed, while the circuit breaker operation switch on the first board is in the disconnected state. The key 2 of the board is removed, the breaker operation switch of the board 3 adjacent to the other of the board 1 is disconnected, and the key 4 of the board 3 is removed in this state, and the board 3 The key 4 and the key 2 of the No. 1 board are inserted into the key switch of the No. 3 board to be in a maintenance state, and in this state, the ground switch operating switch of the No. 3 board is grounded and the No. 1 and No. 3 boards And the key 6 of the No. 3 panel is removed, and the key 7 of the main generator board is removed when the circuit breaker operation switch of the No. 1 main generator panel is disconnected. The main generator panel key 7, the 2nd panel key 5 and the 3rd panel key 6 are inserted into the key switch of the main generator panel and put into the maintenance state. Ground the switch of the panel with the switch for ground switch and ground the circuit of the No. 1 board and the main generator. Characterized by the condition.

  According to the present invention, in the maintenance of the distribution panel, not only the circuit of each panel is surely interrupted and grounded, but also in the interrupted and grounded state, the circuit breaker is erroneously turned on by an erroneous operation due to remote operation or human error. Therefore, a safer interlock method can be obtained.

It is a figure which shows the outline of the connection structure of the several board in a general high voltage switchboard. It is a figure which shows the outline of the high voltage switchboard in which the key interlock method for switchboards of this invention is employ | adopted. It is a flowchart which shows the operation procedure of the key interlock method for switchboards of this invention. It is a figure which shows the outline of the key switch of the 2 * 1 main bus connection board in FIG. It is a figure which shows the outline of the key switch of the No. 1 main generator panel in FIG.

  Hereinafter, the key interlock method for switchboards of the present invention will be described based on the illustrated embodiment.

  FIG. 2 shows an outline of a high-voltage switchboard in which the switchboard key interlock method of the present invention is adopted.

  As shown in the figure, the high-voltage switchboard is composed of No. 1 board No. 1 and No. 2 main bus connection board 10, grounded instrument transformer board 2, No. 1 main generator board 11, No. 1 main transformer board (common use) board 12, 1 and 4 main bus contact board 13 is composed of No. 2 board, 2 and 1 main bus contact board 14 and 3 board is composed of 4 and 1 main bus contact board 15, respectively. It is electrically connected by electric circuit.

  In addition, the high voltage switchboard of this embodiment is provided with a small door for maintenance in addition to the circuit breaker switch on the front of each panel, and equipped with a circuit breaker operation switch and a ground switch operation switch inside, which are operated carelessly. It has a key so that there is no fear.

  Further, when the breaker operation switch is in the “disconnect” position, an electrical interlock is provided so as not to accept a remote breaker input command, and the breaker operation switch of the No. 1 main generator panel 11 is The main generator can be de-energized by setting the “disconnected” position.

  In addition, the operation of “Earth” of each earthing switch can be performed with the condition that the live line path of the relevant board is cut off. Configure. This key switch is provided with a mechanical sequential interlock mechanism from the viewpoint of preventing erroneous operation.

  Hereinafter, the key interlock method for switchboards of the present invention will be described with reference to FIG.

  As shown in the figure, first, it is confirmed in step (a) that the first generator 8 is stopped. Next, when grounding the circuit (A) between the No. 1 and No. 1 main bus connection board 10 and the No. 2 No. 2 main bus connection board 14 in the procedure (b), Open the small door in front of the No. 2 main bus connection panel 10 and set the circuit breaker operation switch to “always” → “break” → “disconnect”. This makes it possible to remove the key 1 of the No. 1 and 2 main bus connection board 10 and remove the key 1 to move to the adjacent No. 2 main bus connection board 14 of the adjacent No. 2 board. To do.

  Next, in the procedure (c), the small door in front of the No. 2 main bus connection board 14 is opened and the circuit breaker operation switch is changed from “always” to “break” to “disconnect”. As a result, the key 3 of the No. 2 main bus contact board 14 can be removed, and the key 3 is removed.

  After that, in step (d), the key 3 removed in step (c) and the key 1 removed in step (b) are inserted into the key switch of the No. 2 main bus connection board 14 shown in FIG. “Normal” → “Maintenance” (in this case, operation in the order of key 3 → key 1). Next, change the ground switch operation switch of Unit 2 & 1 main bus contact panel 14 from "Normal" to "Ground" and switch 1 and 2 main bus link panel 10 of Unit 1 and Unit 2 & 1 of Unit 2 Grounding of the electric circuit (A) with the bus bar connection panel 14 is completed. At this point, the key 5 of the No. 2 main bus connection board 14 can be removed, and the key 5 is removed and moved to the No. 1 main generator board 11.

  Next, when grounding the electric circuit (B) between the No. 1 and No. 1/4 main bus connection board 13 and the No. 3 No. 4/1 main bus connection board 15 in the procedure (e), Open the small door in front of the main bus connecting board 13 and set the circuit breaker operation switch to “always” → “break” → “disconnect”. Now, the key 2 of the No. 1 and 4 main bus connection board 13 can be removed, and the key 2 is taken out and moved to the adjacent 4 and 1 main bus connection board 15 of the No. 3 board to be paired. .

  Next, in step (f), the small door in front of the 4.1 main bus connection board 15 is opened, and the circuit breaker operation switch is changed from “always” to “break” to “disconnect”. Thus, the key 4 of the 4.1 main bus connection board 15 can be removed, and the key 4 is removed.

  Thereafter, in step (g), the key 4 removed in step (f) and the key 2 removed in step (e) are inserted into the key switch of the No. 2 main bus connection panel 14 shown in FIG. “Normal” → “Maintenance” (in this case, operation is performed in the order of key 4 → key 2). Next, change the ground switch operation switch of the 4.1 main bus connection board 15 from “always” to “ground”, and contact the 1st and 4th main bus connection board 13 of the 1st board and the 4/1 main bus connection of the 3rd board. Grounding of the electric circuit (B) 1 with the board 15 is completed. At this time, the key 6 of the 4 · 1 main bus connection board 15 can be removed, and the key 6 is removed and moved to the No. 1 main generator board 11.

  Next, when grounding the electric circuit (C) between the No. 1 main generator board 11 and the No. 1 generator 8 (see FIG. 1), the No. 1 main generator board 11 in the procedure (h). Open the small door in front of the, and change the circuit breaker operation switch from “always” to “break” to “disconnect”. The key 7 of the No. 1 main generator panel 11 can now be removed, and the key 7 can be removed (the generator excitation circuit is opened by the circuit breaker operation switch “disconnect”, so that the generator is Will generate voltage).

  Then, in step (j), the key 7 removed in step (h) and the keys 5 and 9 removed in steps (d) and (g) are replaced with the keys of the No. 1 main generator panel 11 shown in FIG. It is inserted into the switch and “always” → “maintenance” is selected (in this case, operation is performed in the order of key 7 → key 5 → key 6). Subsequently, the earthing switch operation switch of the No. 1 main generator panel 11 is changed from “always” to “ground”, and the electric circuit (C) between the No. 1 main generator board 11 and the No. 1 generator 8 is grounded. Is completed. At this point, the key 8 of the No. 1 main generator panel 11 can be removed.

  By using this key 8, all the back surfaces of the high voltage switchboard can be opened and maintenance can be performed, and the door of the No. 1 exciter panel 9 can be opened and maintenance can be performed. This key 8 cannot be removed when the back cover is open.

  By adopting such a present embodiment, it is possible to realize an electrical and mechanical interlock mechanism in which each key can be removed only at the final position of opening, and thus the door can be opened in the energized state. Therefore, it is possible to prevent an electric shock due to an erroneous operation during maintenance.

  Therefore, according to the present embodiment, in the maintenance of the distribution board, not only the electric circuit of each board is surely cut off and grounded, but also in the cut off and grounded state, the breaker is mistakenly caused by remote operation or erroneous operation due to human error. It can be prevented from being thrown in, and a safer interlock method can be obtained.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  1 ... No.1 / 4 bus bar connection panel, 2 ... Grounding instrument transformer panel, 3 ... Generator panel, 4 ... Transformer feed panel, 5 ... No.1 and 2 bus bar connection panel, 6 ... No.4 / 1 bus Connection board, 7 ... 2 and 1 bus connection board, 8 ... 1 generator, 9 ... 1 excitation board, 10 ... 1 and 2 main bus connection board, 11 ... 1 main generator board, 12 ... 1 No. main transformer (regular) board, No. 13 ... No. 1 main bus contact board, No. 14 ... No. 1 main bus contact board, 15 ... No. 4.1 main bus contact board.

Claims (2)

When consisting of at least No. 1 to No. 3 board, the No. 1 board is formed of a plurality of boards, and when the No. 1 to No. 3 board is electrically connected, the circuit between each board is cut off and grounded.
The No. 1 board has the breaker operation switch of the No. 1 board disconnected with the breaker operation switch of No. 1 board disconnected, and the breaker operation switch of the No. 2 board adjacent to one of the No. 1 boards is disconnected. In this state, the key 3 of the No. 2 board is removed, and the removed key 3 of the No. 2 board and the key 1 of the No. 1 board are inserted into the key switch of the No. 2 board to enter the maintenance state. The grounding switch operation switch of the No. 2 board is grounded, the electric circuit of the No. 1 board and the No. 2 board is grounded, and the key 5 of the No. 2 board is removed,
On the other hand, when the breaker operation switch of the No. 1 board is disconnected, the key 2 of the No. 1 board is removed, and the breaker operation switch of the No. 3 board adjacent to the other of the No. 1 board is disconnected, and in this state The key 4 of the No. 3 board is removed, and the removed key 4 of the No. 3 board and the key 2 of the No. 1 board are inserted into the key switch of the No. 3 board to enter the maintenance state, and in this state the No. 3 board Set the earthing switch operation switch of No. 1 to the ground, and the electric circuit of the No. 1 board and No. 3 board are grounded, and the key 6 of the No. 3 board is removed,
Moreover, the main generator panel key 7 and the second panel key 5 are removed when the circuit breaker operation switch of the main generator panel of the No. 1 board is disconnected, and the key 7 of the main generator board is removed. And the key 6 of the No. 3 board is inserted into the key switch of the main generator board to be in a maintenance state, and in this state, the ground switch operating switch of the main generator board is grounded and the No. 1 board and the main generator A key interlock method for a switchboard, characterized in that the electric circuit of the switchboard is grounded. In the key interlock method for switchboards according to claim 1,
The key 8 on the first board can be removed with the key 3 on the second board, the key 6 on the third board and the key 7 on the first board inserted into the main generator panel key switch on the first board. A key interlock method for a switchboard, wherein the keys 8 can open all the back doors of the No. 1 board.

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