JP2019122145A - Opening/closing unit group replacement method - Google Patents

Abstract

To provide a method in which work for replacing an opening/closing unit group at a current position can be performed smoothly at a small work space for the reason of a plurality of number of times of discontinuous power failures, by utilizing one moving switch gear.SOLUTION: A moving switch gear 100 is connected to a transformer 8 and also connected to a nearest electricity distribution line raised place 13, so as to replace existing electricity distribution-line boxes with new electricity distribution-line boxes one by one. In the course of replacing the electricity distribution-line boxes sequentially, the replaced new electricity distribution-line box is electrically connected to a bus-bar of the moving switch gear 100, a bus-bar of an electricity distribution line box 6 to be replaced next is cut off, and power cables 15 connected to the electricity distribution line box 6 are refitted to the replaced new electricity distribution line box 27. Such work is performed until the existing electricity distribution-line boxes are replaced completely, and when the existing electricity distribution-line boxes are replaced completely, the new electricity distribution-line box replaced lastly is connected to the nearest electricity distribution-line raised place 13. Work for replacing the electricity distribution-line box having the bus-bar cut off therefrom is performed in a state where a complete power failure state is released.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a replacement method useful for replacing a group of switching units such as switchgear and gas insulated switchgear (GIS) used as equipment for power distribution with a minimum configuration.

  Conventionally, a switchgear has been installed as a power distribution facility. The switchgear is a closed switchboard that switches, controls, measures, protects and monitors electric power, and includes a circuit breaker, disconnector, instrument transformer, busbar, connecting conductor, etc. in the installed metal box. The equipment necessary for monitoring and control of the power system is stored in a closed space in the box, divided into circuit sections or functions.

  For example, the general switchgear shown in FIG. 1 (a) is a secondary switch box connected to the secondary side of the distribution transformer, a bus bar of the secondary switch box, and a secondary transformer of another transformer. Connect the two-line power cable through the main box connecting to the bus from the board, the in-house GPT box supplying power used for the power used in the office and each relay, etc., and the distribution breaker not shown. A plurality of (three in the example in the figure) distribution line boxes connected and distributed to the distribution line start-up points of the power demand area through the respective power cables are installed in a row (see Patent Documents 1 and 2 etc.) .

JP, 2008-271737, A JP, 2015-55592, A

Although switching units such as switchgears and gas-insulated switchgears (hereinafter referred to as "GIS") need to be replaced due to age-related deterioration, in the past, these units have now been installed to replace these devices. If the switchgear and GIS can not be replaced at the same position, the switching unit group is installed at another position and replaced.
In addition, when replacing a switchgear or GIS, when installing a new switchgear or GIS at the current installation position, the entire existing switchgear or GIS is removed once, and then the new switchgear or GIS is removed. Had to be installed, it took a long time to remove and Moreover, when installing in another position, work can not be performed unless sufficient empty space is secured.

  In addition, there is also a method of using a switch gear for movement and a circuit breaker for movement when replacing switch gears and GIS, but one switch gear for movement and a breaker for movement are used for each box. Because it was prepared and connected, when the facility space of the power cable connected with each switch gear and transfer breaker was not secured enough, or the starting point of the distribution line is far away It was necessary to lay power cables in a long distance in urban areas, and replacement work was extremely difficult.

  The present invention has been made in view of such circumstances, and solves the various disadvantages described above, and uses a distribution line box for one switch gear for movement, a breaker for movement, or a future line to continuously The main object is to provide an open / close unit group replacement method that enables replacement work of the open / close unit group at the current position to be smoothly performed in a small work space by multiple times of blackouts.

  In order to achieve the above object, the switching unit group replacement method according to the present invention is arranged in parallel with the distribution secondary box using one moving switch gear at least provided with a moving distribution line box. An opening / closing unit group replacement method for replacing an existing opening / closing unit group having a plurality of distribution line boxes, wherein the switch gear for movement is connected to the secondary side of the transformer and the distribution for movement is completed. A switch gear installation step for movement that connects an electric wire box to the nearest distribution line rise point among the distribution line rise points to which the plurality of distribution line boxes of the existing open / close unit group are connected And disconnecting the power line of the distribution line box connected to the close-up distribution line rise point among the plurality of distribution line boxes arranged in parallel of the existing switching unit group and disconnecting the power cable, In the initial replacement step of replacing the distribution box with separated wires and power cables with the new distribution box, and in the all-off state, disconnect the busbars of any of the existing distribution box without changing the existing distribution box. A power cable connected to this is separated and transferred to the replaced new distribution line box, and other unreplaced distribution line boxes other than the distribution line box from which the bus bar is disconnected and the new distribution line replaced A connection adjustment step of electrically connecting the bus bar of the box to the distribution secondary box of the existing opening / closing unit group or the bus bar of the switch gear for transfer, and the all stop state is released after the connection adjustment step. A distribution line box replacement step of replacing the un-replaced distribution line box from which a bus bar and the power cable are disconnected with a new distribution line box, the connection adjusting step, and the distribution line box replacement step Repeat the connection adjustment step and the distribution line box replacement step if there are no more replacement line boxes, and if there are no more replacement line boxes, with the last replacement line box. And a distribution line box replacement completion step of connecting the nearby distribution line start-up point with a power cable.

  Therefore, according to the above-described method, the switchgears of the existing switchgear group are replaced one by one using the switch gear for movement, and the new distribution line box replaced is replaced by the secondary secondary of the switchgear groups already installed. By making electrical connection with the box or the busbar of the switch gear for transfer, it is possible to supply power to the power demand location whenever replacing the distribution box one by one, so long-term continuous blackouts can be avoided. By switching off the power only when all the power outages are required (by multiple nonconsecutive power outages of the required minimum level), the switching unit group can be replaced.

  In addition, since one distribution switch box of the existing switching unit group is replaced in order using one transfer switch gear, there is no need to secure a large work space, and the distribution for transfer to the nearby distribution line rising point The connection box is connected, and the replaced new distribution line box replaces the power cable connected to the existing distribution line box, thereby eliminating the need to draw the power cable over a long distance.

  Here, the distribution line box to be replaced in the initial replacement step and the distribution line box replacement step may be sequentially performed from any of a plurality of distribution line boxes provided in parallel with the existing switchgear, In order to improve the work efficiency, it is preferable to carry out in order from the end of the plurality of distribution box.

  In addition, it is preferable to further include a remaining box replacement step of collectively replacing the boxes other than the distribution line box of the existing open / close unit group after the bus bar is separated in the completely stopped state. This remaining box replacement step may be performed after replacing the plurality of distribution line boxes, or may be performed before replacing the plurality of distribution line boxes.

  As the switch gear for movement, a switchable secondary box or an in-house GPT box may be added to the mover distribution box as required, and the existing opening / closing unit group is generally used. The distribution secondary box, the mother box, the in-house GPT box, and the plurality of distribution line boxes are provided, and the boxes other than the distribution line box are the distribution secondary box, the mother box, the inside It is a GPT box.

As described above, according to the present invention, the existing distribution unit boxes of the open / close unit group are replaced one by one using the movable distribution box and the future line of one movable switch gear, and all the stops are completed. Since it is possible to charge the battery except when it is necessary, it is possible to carry out replacement of the switching unit group at the current position with a minimum necessary configuration by a plurality of noncontinuous power outages. For this reason, it is possible to minimize the work space for replacement work.
In addition, it is not necessary to lay a power cable for replacement work to a long distance to the distribution line setup point, and the existing power cable can be replaced with the new distribution line box, which enables smooth work. It is possible to improve the efficiency.

FIG. 1 is a diagram showing an example of the configuration of an existing opening / closing unit group provided in a substation, in which (a) is a schematic configuration diagram of the whole, and (b) is a single-wire connection diagram. FIG. 2 is an explanatory view for explaining the replacement work of the open / close unit group, and in the full stop state, the switch gear for movement is arranged near the existing open / close unit group and connected to the secondary side of the transformer It is a figure explaining the operation | work which connects the distribution line box for movement to the nearest distribution line starting point. FIG. 3 is an explanatory view for explaining the continuation of the replacement work of the switching unit group, and in the total stop state, the power distribution line for replacing the distribution line box at the end of the plurality of existing paralleled distribution line boxes. It is a figure explaining the operation | work which disconnects the bus bar of a box and withdraws an electric power cable. FIG. 4 is an explanatory view for explaining the continuation of the replacement work of the switching unit group, and after replacing the distribution line box at the end of the plurality of existing paralleled distribution line boxes with the new distribution line box, the entire line stops. In the state, the new distribution line box is electrically connected to the busbar of the switch gear for transfer, and the non-replacement distribution line box busbar adjacent to the new distribution line box is disconnected and connected to the distribution line box It is a figure explaining the operation | work which transfers the power cable which was being carried out to a new distribution line box. FIG. 5 is an explanatory view for explaining the continuation of the replacement work of the opening / closing unit group, and explaining the work of replacing the existing distribution line box adjacent to the new distribution line box in the charged state (canceling all stoppages). It is a figure to do. FIG. 6 is an explanatory view for explaining the continuation of the replacement work of the switching unit group, and after replacing the distribution line box from which the bus bar is separated with a new distribution line box, the new distribution line box is moved in the all-stop state It was connected electrically to the main switchgear for the main switchgear, and the main line of the non-replaced distribution line box adjacent to the new distribution line box was disconnected, and the power cable connected to the distribution line box was replaced immediately It is a figure explaining the operation | work which transfers to a new distribution line box. FIG. 7 is an explanatory view for explaining the continuation of the replacement work of the switching unit group, in which the existing distribution line box adjacent to the new distribution line box recently replaced as the charging state (cancel all stop state) is displayed. It is a figure explaining the operation to replace. FIG. 8 is an explanatory view for explaining the continuation of the replacement work of the switching unit group, and after replacing the distribution line box from which the bus bar is separated with a new distribution line box, the new distribution line box is moved in the all-stop state Electrically connect with the main switchgear switch, disconnect the distribution line breaker of the mobile distribution box, and remove the power cable connected to the mobile distribution box and the nearby distribution line startup point. FIG. 7 is a diagram for explaining the operation of disconnecting the distribution secondary cable and disconnecting the bus bar of the in-house GPT box from the main box. FIG. 9 is an explanatory view for explaining the continuation of the replacement work of the opening / closing unit group, and is a view for explaining the work of replacing the mother run box, the distribution secondary box, and the in-house GPT box in the completely stopped state. FIG. 10 is an explanatory view for explaining the continuation of the replacement work of the opening / closing unit group, in which after replacing the mother run box, the modified secondary box, and the in-house GPT box, the replaced distribution is completed in all stopped state. It is a figure explaining the operation | work which connects the following box to the secondary side of a transformer, and removes the switch gear for movement.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 (a) shows an example of an existing switching unit group 1 installed in a substation.
The opening / closing unit group 1 is configured by installing a plurality of closed switch gears 2, 3, 4, 5, 6, 7 formed of metal box bodies in a row board, and each switch gear is A metal plate (not shown) that constitutes a bus bar is provided on the back of the box, and by connecting the respective metal plates in series, devices accommodated inside each switch gear are connected to the bus bar.

  Each switch gear 2, 3, 3, 4, 5, 6, 7 of the opening / closing unit group 1 is connected to the secondary side of the transformer 8 for distribution, and the busbar of the distribution secondary box 3 and the distribution secondary box Can connect the GPT box 4 and 2 power cables in the office to supply power used for the power used in the office and each relay etc. 2 A plurality of (three in this example) distribution box 5, 6, 7 is installed in a row.

As shown in FIG. 1 (b), the distribution secondary box 3 is connected to the secondary side of the transformer 8 via the distribution secondary cable 10, and the secondary side of the transformer 8 is opened and closed. , And a protective relay (not shown) that operates in the event of an abnormality.
The main unit box 2 includes a main unit breaker 24 and the like used to connect other switch gears connected to another transformer to secure power.
The in-house GPT box 4 is connected to an in-house transformer 41 for supplying power to the substation, a current limiting fuse 42, an instrument transformer (GPT) 43 for supplying power to instruments such as relays, and a bus The bus protection relay 44 etc. which protect an apparatus are provided.
In the distribution box 5, 6, 7 there are two circuit breakers 51a, 51b, 61a, 61b, 71a, 71b, current transformers 52a, 52b, 62a, 62b, 72a, 72b, zero-phase current transformation The relays 53a, 53b, 63a, 63b, 73a, 73b and distribution line protection relays (not shown) are provided.

  In order to replace such an existing opening / closing unit group 1, the following replacement method is required in order to replace it without long-term continuous blackouts and without laying power cables for long distances in a small work space. It is adopted.

First, as shown in FIG. 2, the transfer switch gear 100 is installed in a vacant space near the existing opening / closing unit group 1 shown in FIG. 1. In this example, as the switch gear 100 for movement, a combination of the distribution secondary box 101, the in-house GPT box 102, and the distribution box for movement 103 similar to the existing opening / closing unit group 1 is prepared.
Then, all the electricity in the distribution line of the substation where the switching unit group 1 is provided is completely stopped, and on top of that, the moving cable 11 is transferred from the secondary duct of the transformer 8 and the switch gear 100 is moved. The distribution box 103 for movement of the switch gear 100 for movement is connected to the secondary box 101, and the distribution line start-up point 13 at the closest position (in this example, the distribution box at the end of the existing switch gear 1) Power cable 12 is laid and connected to the distribution line start-up point where 7 is connected.

After that, as shown in FIG. 3, the busbars of the distribution box 7 of the existing switching unit group 1 are separated and the power cable 14 attached to the distribution box 7 is removed as shown in FIG. Let box 7 be replaceable.
Then, as shown in FIG. 4, the distribution box 7 is replaced with a new distribution box 27 prepared nearby, and at the same time, the busbars of the distribution box 6 adjacent to the new distribution box 27 are disconnected. At the same time, transfer the power cable 15 connected to this to the new distribution line box 27, connect the bus bar of the switch gear 100 for movement and the bus bar of the new distribution line box 27 with the movement cable 17, and then stop completely Release
As a result, when the existing first distribution line box 7 is replaced, the full stop state is released, and continuous power failure can be avoided.

Thereafter, with the current supplied, the distribution box 6 is replaced with a prepared new distribution box 26 as shown in FIG. Then, after the replacement of the new distribution line box 26 is completed, the entire distribution state is restored again, and as shown in FIG. 6, the busbars of the existing distribution line box 5 adjacent to the new distribution line box 26 are disconnected. Transfer the power cables 16 connected to this to the new distribution box 26 and replace the new distribution box (between 26 and 27) with each other to connect the bus of the distribution box 103 for movement and electrical Connect to it, and then release all stop condition.
As a result, when the existing second distribution line box 7 is replaced, the power failure state is canceled, and continuous power failure can be avoided.

  Thereafter, in the energized state, the distribution box 5 is replaced with a prepared new distribution box 25 as shown in FIG. Then, after the replacement of the new distribution line box 25 is completed, the entire transmission stop state is established again, and the distribution line breaker (not shown) in the transfer line box 103 for movement of the switch gear 100 for movement is At the same time, cut off the power cable 12 connecting the mobile distribution box 103 and the nearby distribution line startup point 13, and connect the new distribution box 25 and the nearby distribution line startup point 13 with the power cable 18. Connect (In this case, the existing power cable 14 may be transferred). Moreover, while disconnecting the distribution secondary cable 10 which connects the transformer 8 and the distribution secondary box 3, it is possible to separate and replace the busbars of the mother run box 2, the distribution secondary box 3 and the in-house GPT box 4. State.

  Then, as shown in FIG. 9, the mother continuous box 2 of the opening / closing unit group 1, the distribution secondary box 3, and the in-house GPT box 4 in the new mother connection box 22, the alternative secondary box 23, and the in-site GTP box 24. replace. The replacement does not have to stop altogether. Thereafter, while maintaining the full stop state, connect the busbars of all the replaced boxes and connect the transformer 8 and the changed secondary box 23 with the changed secondary cable 10 to move the switch gear 100 for movement and this The mobile cables 11, 17 which were connected to are removed, and the all suspension state is released.

Therefore, according to the above replacement method, replacement can be performed without changing the installation position of the currently installed switching unit group 1, and switching can be performed by a plurality of necessary minimum power outages without long-term continuous power outages. It is possible to replace units.
In addition, it is not necessary to prepare the switch gear 100 for movement for each box of the opening / closing unit group 1 and replacement is possible using one switch gear 100 for movement, so the work space can be reduced, and It becomes possible to hold down the installation expense of moving equipment such as a switch gear for movement.

  Furthermore, according to the above-described method, it is not necessary to replace all the existing distribution line boxes with the distribution line box 103 of the switch gear 100 for movement, so the power supply to the distribution lines that are up remotely is replaced. It will be possible to switch to the new distribution line box, and it will be possible to achieve a necessary minimum power outage.

In the above replacement process, the method of replacing the distribution box first and replacing the mother run box 2, the distribution secondary box 3 and the in-house GPT box 4 later has been described. The secondary box 3 and the in-house GPT box 4 may be replaced first, and the distribution line box may be replaced sequentially.
In addition, in the above-mentioned replacement of the distribution box, an example was given in which the distribution box was replaced in order from the end, but when replacing the distribution box, unreplaced other than the distribution box that is to be replaced The distribution line box may be replaced in any order as long as it can charge the new distribution line box and the replaced new distribution line box.
Furthermore, in the above-described configuration, an example was described in which the distribution box 7 was connected to the short distance distribution line startup point, but the distribution box 5 or 6 is connected to the short range distribution line startup point Even in the case, it can be implemented similarly.

  In addition, although the switch gear 100 for movement used in the above is a combination of the distribution secondary box 101, the in-house GPT box 102, and the distribution box for movement 103, it may be used in combination as appropriate. If there is a protective relay in the distribution box to judge voltage abnormality and it can be locked, the in-mobile GPT box is unnecessary, and there is a distributed primary circuit breaker, which can form a complete stop condition here. If so, the transfer secondary box is unnecessary.

  In addition, although the above configuration has been described as an example applied to a switch gear as an open / close unit group, the same method can be adopted for open / close unit groups such as gas insulated switchgear (GIS). It is.

DESCRIPTION OF SYMBOLS 1 opening / closing unit group 2 mother box 3 distribution secondary box 4 GPT box 5, 6 and 7 distribution line box 8 transformer 12, 14, 15 and 16 electric power cable 13 distribution line starting point 22 mother box 23 arrangement Secondary box 24 internal GPT box 25, 26, 27 New distribution line box 100 Moving switch gear 103 Moving distribution line box

Claims (4)

An open / close unit group replacement method for replacing an existing open / close unit group having a distribution secondary box and a plurality of juxtaposed distribution line boxes using one movement switch gear provided with at least a distribution line box for movement And
In the fully stopped state, the moving switchgear is connected to the secondary side of the transformer, and the moving distribution line box is connected to the distribution line box to which the plurality of distribution line boxes of the existing switching unit group are connected. The switch gear installation step for movement connected to the nearest distribution line startup point among the elevated points,
In the fully stopped state, among the plurality of distribution line boxes provided in parallel of the existing open / close unit group, the power supply line box connected to the nearest distribution line rising point is separated and the power cable is separated. The initial replacement step of replacing the distribution box with the busbar and the power cable separated with a new distribution box,
In the all-off state, the existing switchgear group disconnects the busbars of any unreplaced distribution box and disconnects the power cable connected thereto and transfers it to the replaced new distribution box, the busbar Other unreplaced distribution line boxes other than the distribution line box and the replacement secondary box of the existing switching unit group or the switch gear for transfer Connection adjustment step to electrically connect with the
A distribution line box replacement step of releasing the all-stop state after the connection adjustment step and replacing the unreplaced distribution line box from which the bus bar and the power cable are disconnected with a new distribution line box;
Repeat the connection adjustment step and the distribution line box replacement step, and if there is no replacement line box, connect the new distribution line box replaced last and the nearest distribution line start up point with a power cable Distribution line box replacement completion step,
An opening / closing unit group replacement method characterized by having.   The switchgear unit according to claim 1 or 2, wherein a distribution line box replaced in the initial replacement step and the distribution line box replacement step is sequentially performed from an end of the plurality of distribution line boxes. Group replacement method.   3. The open / close unit according to claim 1, further comprising a remaining box replacement step of collectively replacing the box other than the distribution line box of the existing open / close unit group after the bus bar is separated in the completely stopped state. Group replacement method. The switch gear for movement is obtained by adding a distribution secondary box and an in-house GPT box to the movement distribution line box as required, and the existing open / close unit group is the distribution secondary box, The switchgear unit group replacement method according to any one of claims 1 to 3, further comprising a mother box, an in-house GPT box, and a plurality of the distribution line boxes.

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