JP2009071907A - Solid insulating switchgear and method of testing its insulation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To confirm the insulation performance of a main circuit section in a component molded with an insulating material. <P>SOLUTION: In a solid insulating switchgear, which has housed a grounding circuit composed at least of disconnecting bars 15 and 33 to contact with and separate from connecting conductors 8 and 34, grounding conductors 17 and 36, and grounding polar conductors 18 and 37, and operating mechanisms 14 and 32 for grounding which operate the disconnecting bars 15 and 33, in a box 1, the grounding circuit is arranged on the front side of the box 1, and also it is insulated so that it may withstand a predetermined voltage when the grounding polar conductors 18 and 37 are removed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a solid-insulated switchgear that can easily perform an insulation test of a component molded with an insulating material, and an insulation test method thereof.

In general solid insulation switchgears, there are power receiving panels, conversion panels, mother panels, feeder panels, branch boards, etc., which are constructed by housing components such as the interrupting parts and disconnecting parts molded with insulating material in the box. A power line circuit is configured. And in insulation tests such as withstand voltage test to confirm the main circuit part of the solid insulated switchgear, the voltage application terminal is connected to the receiving point of the power receiving panel, the voltage is applied to the whole solid insulated switchgear, and the insulation performance Has been confirmed (for example, see Patent Document 1).
JP-A-5-227618 (pages 3 and 4, FIG. 2)

  The above-described conventional solid-insulated switchgear has the following problems. During maintenance and inspection, it is possible to check the overall insulation performance by shutting down the entire solid-insulated switchgear, but there is no place to connect the voltage application terminal to each component panel on the line, and it is limited to a partial range. The insulation performance could not be confirmed. For this reason, a terminal capable of applying a voltage to each panel and applying a voltage to a main circuit portion within a predetermined range has been desired.

  The present invention has been made in order to solve the above-described problem. Each terminal is provided with a terminal capable of an insulation test, and a solid insulation switchgear capable of confirming the insulation performance of a main circuit portion within a predetermined range and the insulation test thereof. It aims to provide a method.

  In order to achieve the above object, the solid insulated switchgear of the present invention is a solid insulated switchgear in which at least a grounding device is housed in a box, and the grounding circuit of the grounding device is disposed on the front side of the box, It is characterized by being insulated so that it can withstand a predetermined voltage when the grounding electrode is removed.

  According to the present invention, since the ground circuit arranged on the front side of each panel is insulated so as to withstand a predetermined voltage, it is possible to apply a voltage from the ground circuit, and a main circuit portion within a predetermined range. The insulation performance can be confirmed.

  This is a solid-insulated switchgear that can insulate the ground circuit so that it can withstand an insulation test such as a withstand voltage test and can confirm the insulation performance of a main circuit portion within a predetermined range. Embodiments of the present invention will be described below with reference to the drawings.

  A solid insulation switchgear according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a configuration of a solid insulated switchgear according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining an insulation test method for a solid insulated switchgear according to an embodiment of the present invention.

  As shown in FIG. 1, in the box 1, the 1st unit part 2a and the 2nd unit part 2b are arrange | positioned by the upper and lower two-step stacking on the front side, and these are arrange | positioned on the back side. Connected by bus 3. This circuit configuration is a feeder board.

  The first unit portion 2a includes a shut-off portion 5 in which the vacuum valve 4 is molded with an insulating material such as an epoxy resin, and a disconnection in which a vacuum valve 6 similar to the vacuum valve 4 is molded with the same insulating material as the shut-off portion 5 The portions 7 are arranged with their axial directions substantially horizontal. The main circuit ends on the front side of the blocking portion 5 and the disconnecting portion 7 are connected by a movable side connecting portion 9 in which a connecting conductor 8 arranged in the vertical direction is molded with the same insulating material as the blocking portion 5 and the like. The movable side connection portion 9 has an opening on the front side.

  The opening is provided with an insulating operation rod 10 connected to the movable shaft of the blocking unit 5, and an opening / closing operation is performed by a blocking operation mechanism 11 disposed on the front side. Further, the insulating operation rod 12 is also connected to the movable shaft of the disconnecting portion 7, and the opening / closing operation is performed by the disconnecting operation mechanism 13 arranged on the front side. Further, a grounding operation mechanism 14 is provided between the disconnecting operation mechanism 11 and the disconnecting operation mechanism 13 so that the rod-shaped disconnecting bar 15 can be moved in a substantially horizontal direction so as to contact and separate from the connection conductor 8. It has become.

  The disconnecting rod 15 movably penetrates an annular insulating collar 16 that can withstand a predetermined voltage such as a local withstand voltage value, and three-phase components are gathered together via an L-shaped grounding conductor 17 as a grounding electrode. It is connected to the grounding electrode conductor 18 to be connected. The ground conductor 17 is supported and fixed to a support insulator 19 that can withstand a predetermined voltage. In addition, the disconnecting rod 15 is provided with an insulating layer (not shown) that can withstand a predetermined voltage at a bar-shaped intermediate portion, and is insulated from the grounding operation mechanism 14.

  Here, the disconnecting rod 15, the ground conductor 17, and the ground pole conductor 18 constitute a ground circuit. The grounding device and the grounding operation mechanism 14 constitute a grounding device for grounding the connection conductor 8 of the main circuit conductor.

  A cable head 21 via a current transformer 20 is connected to the main circuit end on the back side of the blocking unit 5, and is connected to a load cable 22. The main circuit end on the back side of the disconnecting portion 7 is connected to the bus 3 on the power supply side.

  On the other hand, the second unit portion 2b has the same configuration as that of the first unit portion 2a, and a disconnecting portion 25 and a blocking portion 26 in which the vacuum valves 23 and 24 are molded with an insulating material are arranged substantially in parallel. The main circuit end on the back side of the disconnecting portion 25 is connected to the bus bar 3, and the opening / closing operation is performed by the disconnecting operation mechanism 27 disposed on the front side. A cable head 29 via a current transformer 28 is connected to the main circuit end on the back side of the blocking portion 26, and is connected to a load cable 30. In addition, the opening / closing operation is performed by the blocking operation mechanism 31 arranged on the front side.

  A grounding operating mechanism 32 is provided between the disconnecting operating mechanism 27 and the disconnecting operating mechanism 31 so that the disconnecting bar 33 is in contact with and away from the connecting conductor 34. The disconnecting rod 33 is connected to a ground conductor 36 supported and fixed to a support insulator 35 and is connected to a ground electrode conductor 37. A control room 38 for controlling each component is provided on the front side.

  Next, a method of applying a voltage to the main circuit portion in a predetermined range and confirming the insulation performance will be described with reference to FIG. 2 showing the first unit portion 2a.

  First, the shut-off operation mechanism 11 is operated to close the vacuum valve 4 of the shut-off part 5, and the disconnection operation mechanism 13 is operated to open the vacuum valve 6 of the disconnection part 7. Then, the grounding operation mechanism 14 is operated to bring the disconnecting rod 15 into contact with the connection conductor 8 which is the main circuit conductor. Thereby, the load cable 22 side can be grounded without affecting the busbar 3 side, and maintenance and inspection can be performed.

  Next, the ground electrode conductor 18 connected to the ground electrode is removed, and the voltage application lead wire 40 is connected to the ground conductor 17. The voltage application lead wire 40 can be connected to an insulation test apparatus such as an AC, DC withstand voltage tester, insulation resistance measuring instrument, or partial discharge detector. Since a predetermined voltage can be applied to the disconnecting rod 15 and the ground conductor 17, an insulation test of a load device connected to the load cable 22 can be performed. That is, the ground circuit can be used as a voltage application terminal capable of an insulation test.

  After the insulation test, the normal operation can be resumed by removing the voltage applying lead wire 40 and connecting the grounding electrode conductor 18 and separating the disconnecting rod 15 from the connecting conductor 8. All of these can be performed on the front side of the box 1 and are easy operations.

  If the disconnection portion 7 is closed and the interruption portion 5 is open, maintenance and inspection can be performed by grounding the busbar 3 side without affecting the load cable 22 side. Also in the second unit portion 2b shown in FIG. 1, the maintenance and inspection on the bus 3 side and the load cable 30 side can be performed by operating the disconnecting portion 25 and the blocking portion 26. Furthermore, by combining the first unit portion 2a and the second unit portion 2b, maintenance and inspection of the main circuit portion within a predetermined range can be performed.

  According to the solid insulated switchgear of the above embodiment, since the ground circuit having the disconnecting rods 15 and 33 contacting and separating from the connection conductors 8 and 34 is disposed on the front side of the box body 1, the operation for grounding the main circuit is performed. This facilitates maintenance and inspection. Further, when the ground electrode conductors 18 and 37 are removed, the voltage can be applied to the main circuit portion within a predetermined range because the predetermined voltage can be withstood, and the insulation performance can be confirmed.

  In addition, although the said Example demonstrated the feeder board, also in each each board | substrate which comprises solid insulation switchgears, such as a receiving board which has the interruption | blocking parts 5 and 26, the disconnecting parts 7 and 25, and a mother continuous board, Maintenance, inspection, and insulation test can be easily performed by operating the grounding device.

  Moreover, in the said Example, the interruption | blocking parts 5 and 26 and the disconnecting parts 7 and 25 are arrange | positioned on the power supply side and load side of the main circuit conductor which the disconnecting rods 15 and 33 of a grounding device contact / separate, and these are opened and closed. It has been explained that the maintenance and inspection of the main circuit portion within a predetermined range can be performed by the above, but the main circuit can be grounded by providing a grounding device at least on each panel, and the ground electrode conductors 18 and 37 can be connected. It can be removed and the main circuit insulation test can be performed. In a board in which only the grounding device is housed in this way, the entire main circuit of the board is within the range of the insulation test.

Sectional drawing which shows the structure of the solid insulation switchgear which concerns on the Example of this invention. The figure explaining the insulation test method of the solid insulation switchgear which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box body 2a 1st unit part 2b 2nd unit part 3 Bus-bar 4, 6, 23, 24 Vacuum valve 5, 26 Shut-off part 7, 25 Disconnection part 8, 34 Connection conductor 9 Movable side connection part 10, 12 Insulation Operating rods 11 and 31 Breaking operating mechanisms 13 and 27 Disconnecting operating mechanisms 14 and 32 Grounding operating mechanisms 15 and 33 Disconnecting rods 16 Insulating collars 17 and 36 Grounding conductors 18 and 37 Grounding pole conductors 19 and 35 Support insulators 20 and 28 Current transformer 21, 29 Cable head 22, 30 Load cable 38 Control room 40 Voltage application lead

Claims (5)

In a solid insulated switchgear that contains at least a grounding device in the box,
A solid-insulated switchgear characterized in that a grounding circuit of the grounding device is disposed on the front side of the box and insulated so that it can withstand a predetermined voltage when the grounding electrode is removed.   2. The solid insulation switchgear according to claim 1, wherein a cut-off portion and a cut-off portion are connected to both ends of a main circuit conductor to which a disconnecting rod of the grounding device is connected and separated.   The solid insulation switchgear according to claim 1 or 2, wherein an insulation test device is connected to the ground circuit. A grounding circuit that is disposed on the front side of the box, is insulated so as to withstand a predetermined voltage, and is connected to the grounding electrode;
A grounding operation mechanism for operating the disconnecting rod of the grounding circuit;
A main circuit conductor that contacts and separates the disconnecting rod;
Removing the ground electrode from the ground circuit;
Bringing the disconnecting rod into contact with the main circuit conductor;
An insulation test method for a solid insulation switchgear, wherein an insulation test device is connected to the ground circuit.   The insulation test method for a solid insulation switchgear according to claim 4, wherein the insulation test device is a withstand voltage test device.

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