JP2017112661A - Gas-insulation switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform any detachment of a circuit breaker unit and a disconnecting unit at a less work process without a total stop at an electric power substation.SOLUTION: A gas-insulation switchgear comprises: a first disconnecting unit 12 that houses a first bus bar disconnector DS1 connected to a first bus bar; a second disconnector unit 13 that houses a second bus bar disconnector DS2 connected to a second bus bar; and a disconnecting unit 11 that houses a cut-off device CB. A bus bar side ground device unit 15 housing a disconnector detection ground switchgear ES1 is connected to a top part of the disconnecting unit. The second disconnector unit is connected to a front surface side of the disconnecting unit. The first disconnector unit is connected to the front surface side of the bus bar side ground device unit. A power incoming unit is arranged in a rear surface side of the disconnecting unit. The disconnector unit can be released to the front surface side with the second disconnector unit.SELECTED DRAWING: Figure 5

Description

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

  FIG. 1 shows an external view of a conventional gas-insulated switchgear, and FIG. 2 shows a skeleton diagram thereof. As shown in the figure, in the gas insulated switchgear, the first disconnector unit 2 and the second disconnector unit 3 are connected to one end side of the circuit breaker unit 1, and the power receiving side unit is connected to the other end side of the circuit breaker unit 1. 4 are connected. One end side where the first disconnector unit 2 and the second disconnector unit 3 are installed is in a portion corresponding to the front side of the gas insulated switchgear. The units to be connected can be attached and detached.

  The first disconnector unit 2 includes a first busbar disconnector DS1, and the second disconnector unit 3 includes a second busbar disconnector DS2. The circuit breaker unit 1 includes a circuit breaker CB connected in series and a current transformer CT. Further, the circuit breaker inspection ground switches ES1 and ES2 are provided at both ends of the circuit breaker CB and the current transformer CT. Prepare. The power receiving side unit 4 includes a lower unit 4a and an upper unit 4b. The lower unit 4a directly connected to the other end of the circuit breaker unit 1 incorporates a line disconnect switch DS3 and a line ground switch ES3. The upper unit 4b connected to the upper side of the lower unit 4a incorporates an instrument transformer VT and a lightning arrester LA.

  The devices mounted on each unit are connected as follows. That is, as shown in FIG. 2, in this gas insulated switchgear, the first bus disconnector DS1 and the second bus disconnector DS2 are connected to the first bus BUS1 and the second bus BUS2, respectively. One end of the CB is connected to the circuit breaker inspection ground switch ES1. One end of the current transformer CT is connected to the other end of the circuit breaker CB. The other end of the current transformer CT is connected to a line disconnector DS3 and a circuit breaker inspection ground switch ES2. The other end of the line disconnector DS3 is connected to the line ground switch ES3, the lightning arrester LA, and the instrument transformer VT to reach the cable head CH. 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 2 that houses the first bus disconnector DS1 and the second disconnector unit 3 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.

  In the premise layout described above, the circuit breaker unit 1 is arranged on the back surface of both disconnector units 2 and 3. The configuration of the conventional gas-insulated switchgear described above is, for example, the case where the breaker CB breaks down or replacement work for checking overhaul, etc. Follow the procedure.

  The first busbar disconnector DS1 and the second busbar disconnector DS2 are both turned off. Then, the second bus BUS2 is stopped, and the lower second disconnector unit 3 is removed from the circuit breaker unit 1 (see FIG. 3A). Next, the second bus BUS2 is replaced with a straight bus (see FIG. 3B). At this time, since the first bus BUS1 is in operation, the substation does not become a complete power outage.

  Next, operation is performed on the second bus BUS2 which is a straight bus. Further, the connection between the circuit breaker unit 1 and the lower unit 4a is also released. Then, the first bus BUS1 is stopped, and the circuit breaker unit 1 is lifted and removed together with the first disconnector unit 2 (see FIG. 3C). At this time, since the second bus BUS2 is operating, the substation does not become a complete power outage.

  Then, if the circuit breaker unit 1 that has been removed is disassembled and a process such as replacement of the circuit breaker CB is executed or a new circuit breaker unit 1 for replacement is prepared, the procedure is reversed. Return to the original state.

  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 1 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. Further, when removing the circuit breaker unit 1, the circuit breaker unit 1 is suspended with a crane or the like, and once lifted upward as shown in FIG. 3 (c), so as not to come into contact with the direct bus BUS. Therefore, the operation is large and complicated. Furthermore, since a predetermined unit is filled with a desired gas for insulation or the like, it is necessary to perform gas treatment (decompression or atmospheric substitution).

  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 with a second disconnector unit containing a disconnector and a circuit breaker unit containing a circuit breaker. A bus-side grounding device unit that houses a device, connect the second disconnector unit to the front side of the breaker unit, and connect the first disconnector unit to the front side of the bus-side grounding device unit. The power receiving side unit is arranged on the rear side of the circuit breaker unit, and the circuit breaker unit is configured to be removable on the front side together with the second disconnector unit. The front side is the side where the busbars are arranged, and the first busbar and the second busbar are both arranged on the front side of the gas insulated switchgear.

  According to the present invention, when the breaker unit is repaired or replaced, the second busbar is stopped, the breaker unit is pulled out together with the second disconnector unit, and the unit can be removed. At this time, since the bus-side grounding device unit, the first disconnector unit, and the power receiving unit are in the same state and are operating, the substation or the like in which the gas insulated switchgear is installed does not undergo a complete power failure. Since the circuit breaker unit is removed from the gas insulated switchgear together with the lower second disconnector unit, the movement of the circuit breaker unit is obstructed on the front side of the circuit breaker unit (front side of the gas insulated switchgear). There is no equipment or the like, and it can be moved horizontally and taken out through the space below the first disconnector unit. Therefore, it is not necessary to lift the circuit breaker unit as in the prior art, and it can be easily taken out. Moreover, since the disconnector unit is disposed on the front side of the gas insulated switchgear, the disconnector unit can be easily replaced.

  (2) The circuit breaker unit may include the circuit breaker and a current transformer, and the power receiving side circuit breaker inspection grounding switch may be mounted on the power receiving side unit. Since the earthing switch for checking the circuit breaker on the power receiving side is arranged not on the circuit breaker unit but on the power receiving side unit, when mounting the circuit breaker and current transformer on the circuit breaker unit, the current transformer is arranged on the bus side. Any of the configurations arranged on the power receiving side may be adopted.

  (3) The circuit breaker unit includes the circuit breaker, a current transformer, and a power-breaking circuit breaker inspection grounding switch, and one end of the circuit breaker is connected to the busbar side. One end is connected to the other end of the circuit breaker, and the power receiving side circuit breaker inspection grounding switch is preferably connected to the other end of the current transformer. In this way, the power receiving unit may adopt the conventional configuration as it is.

  (4) The circuit breaker and the current transformer may be arranged side by side. In this way, the overall height of the circuit breaker unit can be kept low, and even if the bus-side grounding device unit is arranged on the circuit breaker unit, the overall height of the circuit breaker unit and the bus-side grounding device unit is suppressed. I can do it.

  In the present invention, the disconnector unit can be easily replaced and the breaker unit can be replaced without causing a complete power failure at a substation or the like where the gas insulated switchgear is installed.

It is an external view which shows an example of the conventional gas insulated switchgear. It is the skeleton diagram It is a figure explaining the exchange operation of a circuit breaker unit. It is an external view which shows the external appearance of suitable 1st embodiment of the gas insulated switchgear concerning this invention. It is the skeleton diagram. It is a figure explaining the exchange operation of a circuit breaker unit. It is a skeleton figure which shows suitable 2nd embodiment of the gas insulated switchgear concerning this invention. It is a skeleton figure which shows suitable 3rd embodiment of the gas insulated switchgear concerning this invention.

  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.

  FIG. 4 is an external view showing a first preferred embodiment of the gas insulated switchgear according to the present invention, and FIG. 5 is a skeleton diagram thereof. The gas insulated switchgear according to the present embodiment is applied to, for example, a double busbar power transmission substation. In the gas insulated switchgear, a first disconnector unit 12 and a second disconnector unit 13 are arranged on one end side of the circuit breaker unit 11. One end side is the front side of the gas insulated switchgear. Thereby, like the conventional example, when the disconnector for the bus connected to the bus that is an important component of the substation is broken, the disconnector for the bus is in the disconnector unit arranged on the front side. Recovery work can be facilitated. The power receiving side unit 14 is connected to the other end side of the circuit breaker unit 11. The power receiving unit 14 includes a lower unit 14a and an upper unit 14b that are connected vertically. The lower unit 14a is directly connected to the other end of the circuit breaker unit 11.

  Further, as in the prior art, the first disconnector unit 12 includes a first busbar disconnector DS1, and the second disconnector unit 13 includes a second busbar disconnector DS2. The lower unit 14a includes a line disconnector DS3 and a line ground switch ES3, and the upper unit 14b includes a meter transformer VT and a lightning arrester LA.

  Here, in the present embodiment, unlike the conventional case, the height of the breaker unit 11 is made lower than that of the conventional product, and the bus-side grounding device unit 15 partitioned with gas is disposed above the breaker unit 11. The total height of the breaker unit 11 and the busbar side grounding device unit 15 is, for example, equal to the height of the conventional breaker unit 1. The upper first disconnector unit 12 is connected to one end side of the bus-side grounding device unit 15, and the lower second disconnector unit 13 is connected to the breaker unit 11.

  The circuit breaker unit 11 does not include the circuit breaker inspection ground switches ES1 and ES2 as in the prior art, and includes a circuit breaker CB and a current transformer CT. The busbar side circuit breaker inspection grounding switch ES1 is built in the busbar side grounding device unit 15. The circuit breaker inspection grounding switch ES2 on the power receiving side is built in the lower unit 14a. As apparent from a comparison between FIG. 2 and FIG. 5, the electrical connection system of the devices mounted on each unit is the same. Therefore, in a state where the units are connected, the gas insulated switchgear according to the present embodiment operates in the same manner as before.

  Further, in this example, when the circuit breaker CB and the current transformer CT are mounted on the circuit breaker unit 11, they are arranged side by side. Thereby, the space required in the height direction was suppressed, and the height of the breaker unit 11 was suppressed low. Therefore, as described above, the total height of both units in a state in which the bus-side grounding device unit 15 is arranged on the upper part of the circuit breaker unit 11 can be set to be equivalent to the conventional circuit breaker unit 11, and the total device height can be increased. Each unit can be arranged without increasing the height, and the overall size of the gas insulated switchgear can be made the same. Accordingly, since the necessary installation space is the same as the conventional one, for example, the gas insulated switchgear according to the present invention can be installed in place of the existing gas insulated switchgear.

  Next, replacement work of the circuit breaker unit 11 will be described. For example, if the second bus BUS2 is in operation, the first bus BUS1 is driven and the second bus BUS2 is stopped. Then, the breaker unit 11 is disconnected from the bus side grounding device unit 15 and the lower unit 14a. In this state, the circuit breaker unit 11 is pulled out together with the second disconnector unit 13 to remove the unit (see FIG. 6). At this time, the busbar side grounding device unit 15, the first disconnector unit 12, and the power receiving side unit 14 remain as they are. Moreover, the circuit breaker unit 11 is attached on the base 17 which moves on the base 16 with a moving rail, and can move smoothly.

  Thus, in this embodiment, since the circuit breaker unit 11 was removed from the gas insulated switchgear together with the lower second disconnector unit 13, the circuit breaker unit 11 is on the front side (the front side of the gas insulated switchgear). Since there is no device or the like that obstructs the movement of the circuit breaker unit 11, it can be moved horizontally and taken out through the space below the first disconnector unit 12. Therefore, it is not necessary to lift the circuit breaker unit as in the prior art, and it can be easily taken out. Moreover, since it is not necessary to lift the circuit breaker unit 11 at the time of taking out in this way, it is not necessary to ensure the space for taking out the circuit breaker unit 11 above the gas insulated switchgear. Therefore, for example, when this gas insulated switchgear is installed indoors, the ceiling height of the building can be set lower than before. In addition, since it is not necessary to secure an upper space for the removal even outdoors, it is possible to respond flexibly to the installation location.

  Furthermore, even in view of the removal work process, it is not necessary to replace the bus with a direct bus or alternately stop the bus as in the past, and the gas treatment is performed on the second disconnector unit 13 to be removed. The number of processes can be reduced as compared with the above, and work can be performed in a short period of time.

  Further, during the replacement work of the circuit breaker unit 11, the first bus BUS1 is in a live line state, but since the bus-side grounding device unit 15 is connected to the first disconnector unit 12, the grounding switch for circuit breaker inspection By setting ES1 to the on state, the first bus disconnect switch DS1 is grounded by the circuit breaker inspection ground switch ES1. Therefore, even if the circuit breaker unit 11 is removed, no floating potential is generated in the first bus disconnection switch DS1, and there is no possibility that an operator may receive an electric shock.

FIG. 7 shows a second embodiment of the gas insulated switchgear according to the present invention. In the present embodiment, the arrangement of the current transformer CT and the circuit breaker CB mounted on the circuit breaker unit 11 is changed. That is, the current transformer CT is arranged on the bus side. Similarly to the first embodiment, since the circuit breaker inspection grounding switch ES2 is arranged in the lower unit 14a of the power receiving side unit 14, the first embodiment is simply changed by changing the arrangement layout of the devices mounted on the circuit breaker unit 11. This configuration can correspond to a configuration in which the current transformer CT is arranged on the power receiving side as in the gas insulated switchgear and a configuration in which the current transformer CT is arranged on the bus side as in this embodiment.
In addition, since the other structure and effect are the same as that of 1st embodiment, the same code | symbol is attached | subjected to a corresponding member and the detailed description is abbreviate | omitted.

FIG. 8 shows a third embodiment of the gas insulated switchgear according to the present invention. In the present embodiment, on the premise of the first embodiment, the circuit breaker inspection grounding switch ES2 on the power receiving side is mounted on the circuit breaker unit 11. In other words, the circuit breaker CT provided on the power receiving side is directly connected to the circuit breaker inspection grounding switch ES2. According to this configuration, the configuration in which the current transformer CT is arranged on the busbar side as in the second embodiment cannot be changed, but the lower unit 14a of the power receiving unit 14 can use a conventional configuration. .
In addition, since the other structure and effect are the same as that of 1st embodiment, the same code | symbol is attached | subjected to a corresponding member and the detailed description is abbreviate | omitted.

11 Circuit Breaker Unit 12 First Disconnector Unit 13 Second Disconnector Unit 14 Power Receiving Unit 14a Lower Unit 14b Upper Unit 15 Bus Side Grounding Device Unit

Claims (4)

A first disconnector unit that houses a first bus disconnector connected to the first bus, a second disconnector unit that houses a second bus disconnector connected to the second bus, and a breaker A gas-insulated switchgear for a double bus with a circuit breaker unit,
Connected to the upper part of the circuit breaker unit is a bus-side grounding device unit containing a ground switch for circuit breaker inspection,
Connecting the second disconnector unit to the front side of the breaker unit;
Connecting the first disconnector unit to the front side of the bus-side grounding device unit;
A power receiving unit is arranged on the rear side of the circuit breaker unit,
A gas insulated switchgear characterized in that the circuit breaker unit is configured to be removable together with the second disconnector unit on the front side. The circuit breaker unit includes the circuit breaker and a current transformer,
The gas-insulated switchgear according to claim 1, wherein the power receiving side circuit breaker inspection grounding switch is mounted on the power receiving side unit. The circuit breaker unit includes the circuit breaker, a current transformer, and a ground switch for checking the circuit breaker on the power receiving side,
One end of the circuit breaker is connected to the bus side,
One end of the current transformer is connected to the other end of the circuit breaker;
The gas insulated switchgear according to claim 1, wherein the power receiving side circuit breaker inspection grounding switch is connected to the other end of the current transformer.   The gas-insulated switchgear according to claim 2 or 3, wherein the circuit breaker and the current transformer are arranged side by side.

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