JP6578120B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas insulated switchgear (GIS).

  There are various types of gas-insulated switchgear according to the voltage class or the like. FIG. 1 shows a single line connection diagram of a line line of a gas insulated switchgear applied to, for example, a 70,000 V class double bus power transmission substation. As shown in the figure, in this gas insulated switchgear, a first bus disconnector DS1 and a second bus disconnector DS2 are connected to a first bus BUS1 and a second bus BUS2, respectively, which are connected to a circuit breaker CB. The other end of the circuit breaker CB is connected to the current transformer CT, the line disconnect switch DS3, the line ground switch ES3, the lightning arrester LA, and the instrument transformer VT, and connected to the cable head CH. It reaches. The circuit breaker inspection ground switches ES1 and ES2 are connected to both ends of the circuit breaker CB.

  This type of gas-insulated switchgear includes, for example, a circuit breaker CB, a circuit breaker inspection ground switch ES1, E2, and a current transformer CT in a tank 1 filled with an insulating gas, as schematically shown in FIG. Etc. are accommodated to constitute the circuit breaker unit 8. Of the side peripheral surface of the tank 1, a portion corresponding to the front side of the gas insulated switchgear is provided with a first outlet portion 1a and a second outlet portion 1b above and below the portion. A first disconnector unit 5 that houses the first bus disconnector DS1 is connected to the first outlet 1a, and a second buser disconnector DS2 that houses the second bus disconnector DS2 is connected to the second outlet 1b. Connect the disconnector unit 6. On the other hand, a portion of the side peripheral surface of the tank 1 corresponding to the rear side opposite to the first outlet portion 1a and the second outlet portion 1b is provided with a third outlet portion 1c. Although not shown, a unit for housing the line disconnect switch DS3, line ground switch ES3, and the like is connected to the third lead portion 1c. This type of gas insulated switchgear is disclosed in Patent Document 1 and the like.

JP 09-331610 A

  As described above, the conventional gas insulated switchgear includes both the first disconnector unit 5 that houses the first bus disconnector DS1 and the second disconnector unit 6 that houses the second busbar disconnector DS2. The layout is located on the front side of the device. The layout concerned considers facilitating recovery work in the event of a failure of the bus disconnector connected to the bus that is an important component of the substation. Various improvements have been made on the premise of.

  However, the circuit breaker CB is arranged on the back surface of the bus disconnector. In the configuration of the conventional gas-insulated switchgear described above, for example, replacement work when the breaker CB fails is performed in the following procedure in order to avoid a substation stop due to power failure of both double buses.

  (1) The first busbar disconnector DS1 and the second busbar disconnector DS2 are both turned off. Then, the first bus BUS1 is stopped, and the first disconnector unit 5 (first busbar disconnector DS1) is removed from the tank 1 (breaker unit 8) (see FIG. 2A). Next, the first bus BUS1 is replaced with a straight bus. At this time, since the second bus BUS2 is operating, the substation does not become a complete power outage.

  (2) Next, as shown in FIG. 2 (b), operation is performed on the first bus BUS1 that is a straight bus. Then, the second bus BUS2 is stopped and the second disconnector unit 6 (second busbar disconnector DS2) is removed. At this time, since the first bus BUS1 is in operation, the substation does not become a complete power outage.

(3) Thereby, since the tank 1 (breaker unit 8) can be removed, for example, the breaker unit 8 is disassembled and the breaker CB is replaced.
When the replacement of the faulty circuit breaker CB is completed, the original state is restored in the reverse procedure.

  As described above, the conventional gas insulated switchgear has many procedures such as a conversion operation to a straight bus or a bus switching operation when the circuit breaker unit 8 is disassembled due to a failure of the circuit breaker CB or the like. This causes a problem that the work is complicated and complicated and requires a long work period.

  Moreover, if the operation | work which switches to a direct bus line as mentioned above is abbreviate | omitted, the problem shown below will also arise. That is, for example, as shown in FIG. 2 (c), if the circuit breaker unit 8 is to be removed while leaving the operating bus disconnector (second bus disconnector DS2 in the example shown), The conductor 9 connecting the two-bus disconnecting switch DS2 and the circuit breaker CB is touched. Then, at the moment when the circuit breaker unit 8 is removed, the line grounding switch ES housed in the circuit breaker unit 8 is also removed together, so that the grounding of the second busbar disconnector DS2 is released, and the conductor 9 described above is The induction from the second bus BUS2 results in a floating potential, leading to an electric shock. Therefore, it becomes necessary to take the above procedure. Moreover, since the other unit exists in the back side of the circuit breaker unit 8, the circuit breaker unit 8 cannot move to the back side, and the 2nd disconnector unit 6 is located ahead. Therefore, the circuit breaker unit 8 is taken out from the upper side of the apparatus, and there is a problem that workability such as dismantling work is poor in a state where the second bus disconnection switch DS is connected.

In order to solve the above-described problems, the present invention provides (1) a first disconnector unit housing a first bus disconnector connected to a first bus, and a second bus connected to a second bus. A gas insulated switchgear for a double bus having a second disconnector unit containing a disconnector and a breaker unit containing a circuit breaker, wherein the first disconnector unit and the second disconnector unit are , Arranged on both sides of the circuit breaker unit, and configured so that the second disconnector unit is located on the rear side of the gas-insulated switchgear , and in the radial direction on both sides in the radial direction in the upper part of the side peripheral surface of the tank A first outlet part and a second outlet part projecting outward are provided, the first disconnector unit is detachably connected to the first outlet part, and a ground contact opening / closing for the line is connected to the second outlet part. One end of the earthing switch unit containing the switch is removable Coupled to and adapted to couple the second disconnecting switch units to the other end of the earthing switch unit.

In this invention, since it is a gas insulated switchgear for double buses, it has two disconnector units in order to connect to each bus. And since the first disconnector unit is arranged on the front side of the breaker unit and the second disconnector unit is arranged on the rear side of the breaker unit, for example, when the breaker breaks down and the breaker unit is removed, the second disconnector unit By separating from the side, it moves to the front side together with the first disconnector unit and can be easily removed. At the time of such removal, the first bus connected to the first disconnector unit is stopped, and the operation of the second bus is performed, so that the power supply can be efficiently exchanged with a small number of work steps without causing a total power failure.
Further, when the circuit breaker unit is removed, if the connection with the ground switch unit is released, the second circuit breaker can be turned on by turning on the line ground switch stored in the ground switch unit. The disconnector for the second bus in the unit may be kept grounded.

  (2) The second disconnector unit may be positioned on the upper side of the peripheral surface of the circuit breaker unit, and when the connection is released, the second disconnector unit may be moved upward. In this way, when a failure or the like occurs in the second bus disconnector that is housed in the second disconnector unit disposed on the rear side of the breaker unit, the second disconnector unit can be easily moved upward. It can be removed.

  In the present invention, it is possible to easily replace a circuit breaker or the like without causing a complete power failure at a substation or the like where a gas insulated switchgear is installed.

It is a single line connection diagram of the line line of the gas insulated switchgear of the double bus line composition to which the present invention is applied. It is a figure explaining the effect | action of the conventional gas insulated switchgear, etc. 1 is a side view showing an appearance of a preferred embodiment of a gas insulated switchgear according to the present invention. It is a figure explaining the effect | action of this embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not construed as being limited thereto, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

  The gas-insulated switchgear according to the present invention is applied to a power transmission substation with a double bus, and the single-line diagram of the line line of the gas-insulated switchgear according to the present embodiment is as shown in FIG. It becomes the same. FIG. 3 is a side view showing an embodiment of the gas insulated switchgear according to the present invention. As shown in the figure, the first disconnector unit 11 storing the first bus disconnector DS1 connected to the first bus BUS1 and the second bus disconnector DS2 connected to the second bus BUS2 are stored. The second disconnector unit 12 is disposed on both sides of the circuit breaker unit 13 that houses the circuit breaker CB. That is, it arrange | positions on the opposite side of the surrounding surface of the circuit breaker unit 13. FIG. Here, the first disconnector unit 11 is positioned on the front side of the gas-insulated switchgear, and the second disconnector unit 12 is positioned on the rear side of the gas-insulated switchgear.

  That is, the circuit breaker unit 13 is configured by housing the circuit breaker CB in a tank 20 filled with an insulating gas, and is installed on the operation mechanism 21 of the circuit breaker CB. Then, on the side peripheral surface of the tank 20, a first outlet portion 20 a and a second outlet portion 20 b that protrude outward in the radial direction are provided on both sides in the upper radial direction. Further, a third outlet portion 20c protruding outward in the radial direction is provided below the second outlet portion 20b located on the rear side of the gas-insulated switchgear on the side peripheral surface of the tank 20. Further, in the present embodiment, the grounding switch ES1 for the line is not mounted in the tank 20, and the grounding switch unit 14 that houses the grounding switch ES1 for the line is separately provided.

  And the 1st disconnector unit 11 is connected to the 1st opening | mouth part 20a so that attachment or detachment is possible. In addition, one end of the ground switch unit 14 is detachably connected to the second outlet 20b. The second disconnector unit 12 is connected to the other end of the ground switch unit 14. That is, the ground switch unit 14 is interposed between the circuit breaker unit 13 and the second disconnector unit 12.

  Moreover, the current transformer unit 15 that houses the current transformer CT is detachably connected to the third outlet portion 20c. As a result, the current disconnector unit 15 is disposed below the second disconnector unit 12 disposed on the rear side of the circuit breaker unit 13. On the other hand, there is no other unit on the upper side and it becomes an open space. Furthermore, a ground switch unit 16 in which the line ground switch ES2 is stored, a lightning arrester unit 17 in which the lightning arrester LA, and the like are stored are sequentially connected to the subsequent stage of the current transformer unit 15.

  Next, the operation of this embodiment will be described. For example, assuming that the circuit breaker CB has failed, the replacement operation is performed according to the following procedure. First, the second bus disconnector DS2 is turned off. Then, the first bus BUS1 is stopped and the second bus BUS2 is operated. In this state, the connection between the second outlet 20b of the tank 20 and the earthing switch unit 14 and the connection between the third outlet 20c and the current transformer unit 15 are released, and the breaker together with the first disconnector unit 11 is released. Remove the unit 13. At this time, the front side of the first disconnector unit 11 is open, and the breaker unit 13 and the first disconnector unit 11 are integrated, so the breaker unit 13 is connected to the front side of the gas insulated switchgear. It can be easily removed by moving to. When the replacement of the faulty circuit breaker CB is completed, the circuit breaker unit 13 is connected to the ground switch unit 14 and the current transformer unit 15 in the reverse procedure to the above.

  As described above, when exchanging the circuit breaker CB, etc., it is sufficient to stop the single bus once (in the above example, stop the first bus BUS1). Temporary connection straight buses are not required, and there are fewer work steps and work efficiency is improved. And during execution of the exchange work concerned, a substation does not become a total power failure by operation of the 2nd bus bar BUS2.

  Furthermore, since the earthing switch unit 14 is connected to the second disconnecting switch unit 12, the line grounding switch ES1 is turned on so that the second bus disconnecting switch DS2 is connected to the line grounding switch ES1. Grounded. Therefore, even if the circuit breaker unit 13 is removed, no floating potential is generated in the second bus disconnection switch DS2, and there is no possibility that the operator may receive an electric shock.

  On the other hand, when the first bus disconnector DS1 breaks down, the first bus BUS1 is stopped in the same manner as in the prior art, and the connection between the first bus disconnector DS1 and the first outlet 20a is released. By moving the bus disconnection switch DS1 to the near side, it can be quickly and easily removed from the circuit breaker unit 13 and replaced.

  Further, when the second bus disconnector DS2 located on the rear side of the circuit breaker unit 13 breaks down, the upper side of the second disconnector unit 12 is open, so that the first bus BUS1 is stopped, for example, By removing the connection between the second disconnector unit 12 and the ground switch unit 14 and moving the second disconnector unit 12 upward, it is possible to easily and quickly remove and replace the unit. Further, since the second disconnector unit 12 is smaller than the circuit breaker unit 13, the second disconnector unit 12 is light and easy to lift, and the upward moving distance for removal may be short. Therefore, in this embodiment, it is also possible to ensure that recovery work is easily performed when a bus disconnector that is connected to a bus that is an important component of a substation fails.

11 First disconnector unit 12 Second disconnector unit 13 Breaker unit 14 Ground switch unit 15 Current transformer unit 16 Ground switch unit

Claims (2)

Shut off in the tank, the first disconnector unit containing the first bus disconnector connected to the first bus, the second disconnector unit containing the second bus disconnector connected to the second bus, A gas-insulated switchgear for a double bus with a circuit breaker unit that houses the device,
The first disconnector unit and the second disconnector unit are arranged on both sides of the breaker unit, and the second disconnector unit is configured to be located on the rear side of the gas insulated switchgear ,
A first outlet portion and a second outlet portion projecting outward in the radial direction on both sides in the radial direction at an upper portion of the side peripheral surface of the tank;
The first disconnector unit is detachably connected to the first outlet portion,
One end of a ground switch unit that houses the ground switch for the track is detachably connected to the second outlet portion,
A gas insulated switchgear comprising the second disconnector unit coupled to the other end of the ground switch unit .   2. The gas insulation according to claim 1, wherein the second disconnector unit is positioned on an upper side of a peripheral surface of the circuit breaker unit, and enables an upward take-out movement when the connection is released. Switchgear.

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