JPH0674012U - Gas insulated switchgear - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a gas-insulated switchgear that mechanically interlocks so that the operating procedures of a circuit breaker, a disconnector, and a grounding device can be performed without error. [Structure] A long hole 19 is formed in a lock bar 18 coupled to a movable lead rod 15 of a circuit breaker 1 and a slider 24 is provided in the long hole 19, and one end is connected to a movable blade 20 of a disconnector 2 to be freely rotatable. Pin 2 to the other end of the first arm 21
The second arm 2 rotatably coupled to the slider 24 via one end and one end of which is connected to the ground blade 28 of the ground device 3.
The other end of 6 is arranged below one end of the first arm 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas-insulated switchgear so that a mechanical interlock of a circuit breaker can be reliably performed.

[0002]

[Prior art]

 A gas-insulated switchgear (hereinafter simply referred to as GIS) is configured by accommodating a circuit breaker, a disconnector, a grounding device, a grounding device, etc. inside the housing and filling it with an insulating gas to form a power receiving unit. ing.

A wiring diagram of the GIS is shown in FIG. In the figure, all 6 are GIS, 1 is a circuit breaker (hereinafter referred to as CB), 2 is a disconnecting switch (hereinafter referred to as DS), 3 is a grounding device (hereinafter referred to as ES), and 4 is a static arrester. Yes, 5 is an instrument transformer.

In order to open and close these CBs, DEs, and ESs, certain conditions must be satisfied in relation to other switches. That is, in order to open / close the CB, the condition is that DS is closed and ES is open. Then, in order to open / close the DS, it is a condition that both CB and ES are open. Furthermore, in order to open / close the ES, it is a condition that both CB and DS are open. Between CB, DS and ES, an electrical interlock is used that constitutes an electrical circuit in which if one is closed, the other cannot be closed.

A mechanical interlock is made between the DS and the ES as shown in FIG. In the figure, 8 is an insulator, 9 is a fixed side terminal, and 10 is a movable side terminal. By moving the movable rod 12 attached to the insulating lever 11, the opening / closing operation of the DS2 can be performed. Further, 13 is a rotatable grounding blade, which does not rotate to the right of the vertical state in the figure, so the grounding blade 13 comes into contact with the movable rod 12 only when the DS2 is open, and the movable side terminal is shown. Conducting with 10, ES3 is closed.

[0006]

[Problems to be solved by the device]

 However, in the relationship between CB, DS and ES, only electrical interlock is made and mechanical interlock is not made.

Therefore, if the CB is opened or closed by a manual operation in the field unrelated to the electrical interlock condition, an accident may occur. For example, when DS is opened when manually inputting CB, and forgetting to open ES after checking the PCT and ES is closed, close CB and then open DS. If it is closed, a short circuit fault current will flow at the same time as the DS is closed and the contacts of the DS will melt, making it unusable due to the occurrence of a ground fault.

Therefore, the present invention aims to provide a gas-insulated switchgear that solves the above problems.

[0009]

[Means for Solving the Problems]

 In order to achieve such an object, the structure of the present invention is a gas-insulated switchgear having a circuit breaker, a disconnector, and a grounding device, and a movable lead bar for opening and closing the circuit breaker. A slider that can move a fixed amount along the axis is provided, and one end is interlocked with a movable blade that opens and closes the disconnector, and the other end of the rotatable first arm is disconnected when the disconnector is opened. To prevent the device from closing, the grounding device is rotatably connected to the slider, and one end is interlocked with the grounding blade for opening and closing the grounding device, and the other end of the rotatable second arm is closed. It is characterized in that it is arranged at a position that prevents the first arm from rotating in the direction in which the disconnector is closed at.

[0010]

[Action]

 When CB and DS are open and ES is closed, the other end of the second arm restrains the rotation of one end of the first arm and the movement of the movable lead rod is restrained by the slider that engages with the first arm. . Therefore, in order to close the CB, it is necessary to open the ES, close the DS, and finally close the CB.

On the other hand, when CB and DS are closed and ES is open, the first arm restrains the second arm and the movable lead rod restrains the first arm. Therefore, the procedure must be such that after opening CB, opening DS, and finally closing ES.

[0012]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. Since the present embodiment is an improvement of a part of the conventional gas-insulated switchgear, the same parts as those in the prior art are designated by the same reference numerals and the description thereof is omitted.

The structure of the gas-insulated switchgear according to the present invention is shown in FIG. As shown, a pair of DS2 and a pair of ES3 are arranged so as to sandwich CB1. Below the movable lead rod 15 for opening and closing the CB1, there is provided an operating shaft 16 which is rotationally driven by a driving means (not shown), and the tip of a lever 17 fixed to the operating shaft 16 is coupled to the movable lead rod 15. The lower end of the locked lock bar 18 is rotatably connected via a pin. The lock bar 18 is formed with a long hole 19 extending in the length direction.

Below the movable blade 20 of the DS2, a first arm 21 is rotatably supported around a support shaft 22 supporting the intermediate portion thereof, and one end of the first arm 21 and the movable blade 20 are supported. The intermediate portion is interlockingly connected via a rod 23. The other end of the first arm 21 is rotatably connected to a slider 24, which is movable in the elongated hole 19, via a pin 25. This DS2 is arranged on both sides of CB1.

Below ES3 connected to DS2, a second arm 26 is rotatably supported around a support shaft 27 supporting an intermediate portion thereof, and one end of the second arm 26 and a ground blade 28 are connected. The intermediate portion is interlockingly connected via a rod 29. The other end of the arm 26 is located below one end of the first arm 21 and is constrained so that it cannot move above one end of the first arm 21. The left and right grounding devices 3 of the CB1 in the figure have the same configuration.

Since the pair of DS2s must be in the same open or closed state in relation to CB1, the other ends of the pair of first arms 21 are mutually connected by the pin 25. On the other hand, a pair of ES3s can be operated individually without any correlation so that necessary parts can be grounded. A motor (not shown) for electrically operating the DS2 is interlockingly connected to one of the support shafts 22 fixed to the pair of first arms 21, and a handle (not shown) for manually operating the DS2 is connected to the other. It is detachably attached.

Next, the operation of such a gas insulated switchgear will be described. FIG. 1A is a diagram when CB1 and DS 2 are open and ES3 is closed. Since ES3 is in the closed state, the other end of the second arm 26 prevents the one end of the first arm 21 from descending, and further, the presence of the slider 24 engaging with the other end of the first arm 21 causes the movable lead bar. Block the rise of 15. That is, when ES3 is closed, DS2 and CB1 cannot be closed. Therefore, in order to close CB1 (change the state shown in the figure), it is necessary to open ES3, then close DS2, and then close CB1. Things can't happen.

When the CB1 is closed in this way, each component will occupy the position shown in FIG. 1 (b). When CB1 is closed, the other end of the first arm 21 is constrained so that the DS2 cannot be opened, and the other end of the second arm 26 is constrained by one end of the first arm 21. ES cannot be closed. In other words, when CB1 is closed, neither DS2 can be opened nor ES3 can be closed, thus ensuring safety. Therefore, in order to change the state of Fig. 1 (b), it is necessary to open CB1 and then open DS2, and then close ES3, which may result in erroneous operation. I don't get it.

In addition, CB1, DS2 and ES3 are arranged side by side in the same direction, so that the busbar of the gas insulated switchgear also has a linear arrangement. Therefore, complicated machining of the bus bar becomes unnecessary.

[0020]

[Effect of device]

 As can be seen from the above description, according to the gas insulated switchgear according to the present invention, the movable lead rod for operating the circuit breaker, the first arm for operating the disconnector, and the second arm for operating the grounding device are provided in association with each other. Therefore, it is inevitable that the operation cannot be performed unless the operation is performed in a specific procedure, and the mechanical interlock surely prevents accidents due to erroneous operation.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas-insulated switchgear according to the present invention.

FIG. 2 is a wiring diagram of a gas insulated switchgear.

FIG. 3 is a configuration diagram of a disconnector with a grounding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 2 ... Disconnector 3 ... Grounding device 15 ... Movable lead rod 18 ... Lock bar 19 ... Long hole 20 ... Movable blade 21 ... First arm 22, 27 ... Support shaft 23, 29 ... Rod 24 ... Slider 25 ... Pin 26 ... Second arm 28 ... Ground blade

Claims (1)

[Scope of utility model registration request] 1. A gas-insulated switchgear having a circuit breaker, a disconnector, and a grounding device, wherein a movable lead bar for opening and closing the circuit breaker is movable by a fixed amount along the axis of the movable lead bar. A slider is provided, and one end is interlocked with a movable blade for opening and closing the disconnector, and the other end of the rotatable first arm is rotatable so that the disconnector does not close when the disconnector opens. The second end of the rotatable second arm, which is coupled to a slider and has one end interlockingly connected to a grounding blade for opening and closing the grounding device, in the direction in which the disconnector is closed when the grounding device is closed. A gas-insulated switchgear, wherein one arm is arranged at a position to prevent rotation.