KR820001354Y1 - An enclosed type swithing device - Google Patents

Abstract

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Description

Hermetic switchgear

1 is a longitudinal sectional front view showing an example of a sealing switchgear applying the present invention.

2 is a longitudinal cross-sectional view showing the vicinity of the blocking portion of FIG.

3 is a perspective view showing in detail the main portion of FIG.

4 is a graph showing the reference resistance value of each state in one embodiment of the present invention.

5 is a configuration diagram showing another example of the hermetic closing device to which the present invention is applied.

The present invention relates to a closed type switchgear comprising a current interrupter in a closed container such as an air circuit breaker or a gas circuit breaker.

The sealed switchgear refers to a current blocking portion formed in a sealed container in which a arc medium is enclosed. An air circuit breaker using compressed air, a gas circuit breaker using SF ₆ gas, and an insulating oil as the arc extinguishing medium. Compared with an oil circuit breaker and a circuit breaker using a circuit breaker (斷 路 器) that cuts a small current is known.

In the case of a large current such as a plurality of current interruptions or a short circuit current, the contactor is damaged even by a single current interruption in the closed type switching device. Therefore, closed switchgear should be checked regularly by the contactor and, if the contactor is severely damaged, the contactor should be replaced.

In the inspection of the contactor in the conventional hermetic switchgear, the state of the contactor was visually observed to determine the degree of damage. However, the contactor of the hermetic switchgear is disposed in the container as described above, so the container must be dismantled or removed every time the contactor is checked. At the same time, the SOHO media had to be recovered.

In particular, gas circuit breakers, because it is obtained a stable electric characteristics must remove the water from the SF ₆ gas, SF ₆ the cumbersome need of gas recovery and drying in the container, the vacuum in the container, SF ₆ gas charge or the like is accompanied by .

It is desirable to reduce the working time as much as possible because such work is to be carried out with the load stopped. On the other hand, in order to improve the maintenance work, the above-mentioned work time should be shortened as much as possible and the interval between periodical checks should be increased. If you want to shorten the time required for one-time inspection or if it is judged that the contactor is bad by the inspection, the contactor who does not have to remove the container to perform the inspection before this judgment is good and does not require replacement. If you can check the contacts in a closed state, you do not need to disassemble and reassemble the container, and it is very desirable to reduce maintenance time by shortening the outage time. Do.

It is an object of the present invention to provide a closed type switchgear that can check a contact without dismantling the container.

The present invention captures the degree of damage of a contact as a change in contact resistance.

The hermetic switchgear has a pair of bushings which, when used as a single body, lead the terminals at both ends of the blocking portion in the container to the outside. Moreover, when comprised by the combination of several apparatus, it has a grounding apparatus.

This earthing device has a conductor in contact with the breaker, which is exposed out of the container.

The present invention measures the resistance between the external terminals of the bushing and the external terminals of the grounding device with the breaker closed, and compares the result of the measurement with the normal value, which is measured in advance, to determine whether the contact is good or bad. Between the external terminals of the bushing and between the external terminals of the grounding device, there is a current collector similar to the contact of the breaker. However, this current collector does not open like a contact of a blocking part.

Therefore, arc does not occur in the current collector, and there is no change in contact resistance even after breaking the current. For this reason, the specific value of the above-mentioned contact resistance has a very high reliability since the change in the contact resistance of the contact of the breaker part can be known.

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

1 shows a gas circuit breaker as an example of a hermetic switchgear. A pair of bushings 2 are connected to both ends in the axial direction of the tank 1 filled with SF ₆ gas. A blocking part 3 is arranged in the tank 1, which is an insulating support container 4 fixed in the tank 1, a bracket 5 fixed to the insulating support container 4, and an auxiliary support. It is indicated by the insulator 6.

Although not shown, the configuration in the tank 1 is symmetrical about the bracket 5. Both interrupting portions are electrically connected in series by brackets 5 and the terminals at both ends thereof are connected to the center conductor 7 of the bushing 2.

The center conductor 7 is connected to an external terminal 8. The terminals of both ends of the cut-off part are led out of the tank 1 by the external terminal 8. The interrupting resistor 3 is connected with an input resistance device 9 in electrical parallel. This input resistance device 9 suppresses the input surge (Surge) induced during the closing of the interruption unit 3.

Although the detailed description about the interrupting | blocking part 3 and the input resistance apparatus 9 is mentioned later, they open and close operation by a manipulator.

This operation is operated through the insulating operation rod 10 inserted into the insulating support container 4, and the input resistance device 9 is closed in advance of the breaking part 3 so that a resistance of about 200 kV is applied between the external terminals 8. After the surge voltage is reduced by insertion, the breaker 3 is closed.

In addition, the open resistance device 9 is opened in advance of the open circuit breaker 3, and the input resistor device 9 does not have the same current blocking capability as the breaker 3.

The structure of the interrupting section 3 and the input resistance device 9 is shown in FIG. First, the blocking unit 3 will be described. The support cylinder 11 is fixed to the bracket 5, and the piston 12 is fixed to this support cylinder 11. As shown in FIG. Moreover, the rotation lever 13 is supported by the bracket 5 so that rotation is possible. One end of the rotary lever 13 is connected to the insulating operating rod 10 by an intermediate lever 14.

The other end of the rotary lever 13 is connected to the central axis 16 by the intermediate lever 15. The central shaft 16 has a cylinder 17 provided concentrically, and the central side 16 and the cylinder 17 are supported by the piston 12 and at the same time slide with respect to the piston 12. It is supposed to be.

In addition, they are composed of a compression device, the gas in the compression device is compressed by the operating force transmitted by the insulating operating rod (10). The compressed gas is used for extinguishing purposes described later. The movable contact 18 is fixed to the tip of the central shaft 16. The insulating cover 19 and the insulating nozzle 20 are fixed to the cylinder 17 so as to surround this movable contact 18.

A flow path communicating with the compression device is formed between the insulating cover 19 and the insulating nozzle 20.

The fixed contactor 21 fixed by the insulator 6 of FIG. 1 is provided opposite the movable contactor 18 and can enter the insulating nozzle 20 and make contact with the movable contactor 18. The fixed main contactor 22 for electricity supply is fixed to the outer periphery of the fixed contactor 21.

This fixed main contactor 22 is paired by the movable main contactor 23 fixed to the cylinder 17. In the closed state not shown, the movable contact 18 is in the dotted position and is connected with the fixed contact. The movable main contactor 23 is in contact with the fixed main contactor 22 at the dotted line position.

Detailed description of the opening operation is operated by driving the insulation operating rod 10 downward by the manipulator described later. By this operation, the movable main contactor 23 first opens from the fixed sphere contactor 22. Then, the movable contact 18 opens from the fixed contact 21 and the circuit is interrupted by this opening. The arc generated by the opening between the contacts 18 and 21 is extinguished by the blowing of the gas which has been compressed by the aforementioned compression device and passed between the insulating cover 19 and the insulating nozzle 20.

The input resistance device 9 will be briefly described. The insulating cylinder 66 is fixed between the plate-shaped conductor 24 in which the fixed contact 21 of the interruption | blocking part 3 was mounted, and the bracket 5. The resistor 25 is housed inside the insulating cylinder 66.

One end of the resistor 25 is electrically connected to the stationary contact 21 by the plate conductor 24. A fixed resistance contact 26 is connected to the other end of the resistor 25. The movable resistance contact 27 which faces the fixed resistance contact 26 is always biased by the spring 28 in the direction away from the fixed resistance contact 26.

The second rotation lever 29 is rotatably supported by the bracket 5. One end of the rotary lever 29 is connected to the connection side of the insulating operating rod 10 of the rotary lever 13 by the intermediate lever 30. The engagement lever 31 is connected to the other end of the rotary lever 29. The engagement lever 31 is stabilized in the state shown by the spring 28. As shown in FIG.

The engagement lever 31 drives the movable resistance contactor 27 against the spring 28 when the rotation lever 29 rotates counterclockwise. The movable resistance contactor 27 comes into contact with the fixed resistance contactor 26 and one end of the engagement lever 31 touches the stopper 51 for a while, and the engagement lever 31 rotates clockwise to engage with the movable resistance contactor 27. Loosen

For this reason, the movable resistance contact 27 is opened from the fixed resistance contact 26 by the spring 28. As shown in FIG. The point of time at which the engagement lever 31 and the movable resistance contact 27 are released is after the closing of the breaker 3 is completed. Such a blocking portion 3, an input resistance device 9 and a structure are described, for example, in the specification of US Pat. No. 4,009,458.

As can be understood from the above description, when the focus is on the closing operation, the breaker first closes between the resistance contacts 26 and 27, and then closes between the contacts 18 and 21, and then closes the main contact 22, 23) Closed.

Since the ohmic contacts 26 and 27 close the circuit initially, they generate and damage the preceding arc. The contacts 18 and 21 are made of an arc resistant material, but are damaged by arcs generated during current interruption. The main contactors 18 and 21 should be constructed so as not to be damaged, but may be damaged because their role is made of a material having a small electrical resistance and is not necessarily arcing.

In addition, the vicinity of the contacts 18, 21, 22, and 23 of the interruption | blocking part 3 is very delicate, and care must be taken in monitoring their damage paths.

The present invention requires a step of detecting the damage degree of each contactor from the contact resistance value by measuring the resistance between the external terminals 8 of FIG. Therefore, to this end, it is necessary to be able to measure the focusing resistance of each contact in the closed state. This embodiment will be described with reference to FIG. 1 together with the configuration of the manipulator.

The lower end of the insulation operating rod 10 is led out of the tank 1 by the linkage device 32 and is connected to the connecting rod 33. One end of the connecting rod 33 is a spring 34 for closing the closing portion is connected, the other end is fixed to the piston (35). The piston 35 is capable of moving in the cylinder 36 and is usually positioned at the right end by a spring 34. However, when the high pressure fluid is supplied into the seal 37 formed by the piston 35 and the cylinder 36, the piston 35 moves to the left end against the spring 34. By the movement of this piston 35, the insulated operating rod 10 is driven downward, and the interruption | blocking part 3 is opened. The high pressure fluid in the chamber 37 is supplied from the fluid reservoir 39 by the operation of the solenoid valve 38. The solenoid valve 38 is a three-way valve that communicates between the chamber 37 and the fluid reservoir 39 and between the chamber 37 and the low pressure side (in the air when the fluid is air).

In this embodiment, the piston 35 in the open state of the blocking portion is locked by the locking device 40, and the high pressure fluid in the chamber 37 is immediately discharged. The closing operation is performed by releasing the piston 35 from the locking device 40 by an instruction to the coil 41.

This embodiment makes good use of the closing operation force by the spring 34 to operate the operating system in the contact state of each contactor described above to stop or operate the lung at a very slow speed. In order to do this, the low speed closing device 40 is installed. The other end of the lever 43, one end of which is connected to the piston 35, is connected to one end of the lever 44. The lever 44 may rotate about the other end. In the vicinity of the free end of the lever 44, a guide 45 is fixed.

In addition, a coupling body 46 having a female thread is mounted near the free end of the lever 44. Usually, the above structure is always standing. The connecting rod 47 is screwed to the connecting body 46 for inspection. This connecting rod 47 rotates without changing a position. This rotation is performed using the handle 48, and the connecting rod 47 is rotated clockwise, that is, in the closing direction. The connecting rod 47 is marked with a scale corresponding to the guide 45, and the state of the breaker 3 and the input resistance device 9 can be known by the position of the guide 45.

Even if the lever 44 is rotated, the coupling member 46 and the connecting rod 47 can be properly maintained as shown in FIG. 3 by making the lever 44 into two plates. The connecting body 46 is rotatably mounted. In this way, when the contact between the resistance contacts 26 and 27 is closed, when the contact between 18 and 21 is closed, the handle 48 at each position when the contact between the main contacts 22 and 23 is closed. ), Stop the rotation and measure the resistance between the external terminals (8). In other embodiments, the handle 48 is slowly rotated to continuously detect resistance between the external terminals 8 until the closing operation is completed.

If the contactor is damaged, the contact becomes unstable and the contact resistance increases from the initial state. The second step of the present invention is to compare this measurement result with a reference value that has already been measured. 4 shows the resistance value R positioned on the horizontal axis at the increasing side, where A is the position where resistance contacts 26 and 27 are closed, and B is the contact 18 and 21 closed. Position C denotes a position where the main contactors 22 and 23 are closed. The solid line represents the standard value 49 and the dotted line tolerance value 50.

The change in the standard value 49 and the allowable limit value 50 immediately after passing through positions A, B, and C indicates that, for example, the fixed contactor 21 and the movable contactor 18 have a difference in contact area between the initial contact point and the initial contact point. It is increasing. When the detected resistance value is between the standard value 49 and the tolerance limit value 50, the contact is not exchanged. At this time, since the tank 1 is kept open or the gas in the tank 1 is not recovered as in the prior art, the inspection is simple and is performed in a short time. On the other hand, when the resistance value exceeds the allowable limit value 50, the contactor is defective, so the replacement operation is performed.

It is preferable that the setting of the allowable limit value 50 is lower than the value that must be replaced immediately. For example, it is good to predict the resistance value that increases from the increase in the resistance value until the next inspection time, and to set the allowable limit value 50 at a value that does not need to be replaced by the next inspection time.

Originally, the breaker may cut off the large current abnormally until the next inspection time. In this case, check other than the regular inspection.

The inspection method described above can be applied to a closed type switchgear other than a gas circuit breaker. It can also be adapted to a hermetic switchgear without the input resistance device 9. In addition, although the configuration of the manipulator can be adapted to other circuit breakers, the manipulator in a closed manner by the spring can be most easily implemented.

Next, an example of adapting the present invention to a special closed type switching device will be described with reference to FIG. 5. The apparatus shown in FIG. 5 is called a gas insulated switchgear, and all the parts which comprise a circuit are comprised in the airtight container.

The tank 1 filled with SF ₆ gas is electrically insulated in the tank 1 so as to form a blocking unit 3. Both ends of the tank 1 are connected to the disconnecting containers 52 and 53, respectively. Insulation spacers 54 and 55 are formed between the tank 1 and the containers 52 and 53 for the disconnecting device, and are separated by gas by the insulation spacers. Cases 58 and 59 electrically insulated by insulators 56 and 57 are connected to both ends of the tank 1, respectively. In the cases 58 and 59, there are movers 60 and 61 which are driven by manipulators 58 and 59, and the movers 62 and 63 are formed by the breaker 3, respectively. Electrical contact with the movable contact side and the fixed contact side is made. The configuration including the movers 62 and 63 is called a grounding device to secure work by making the cut-off portion 3 a ground potential.

In general, the movers 64, 63, and the cases 58, 59 are in an electrically floating state, and a short circuit that can separate between the cases 58, 59 and the tank 1 64 and 65 are connected to the same potential as the tank 1.

The tank 1 is at ground potential.

Therefore, when the movable parts 62 and 63 come into contact with the breaker 3, the breaker 3 becomes the ground potential.

As for the configuration of such a grounding device, Japanese Utility Model Publication No. 52 is shown in No. 55476l, for example.

The implementation of the present invention is performed by first opening the disconnecting sections 66 and 67.

Then, the movable members 62 and 63 are brought into contact with the cut-off portion 3 to remove the single membrane lines 64 and 65. The movers 62 and 63 are supported by the cases 58 and 59 and are at the same potential.

Thus, the cases 58 and 59 become external terminals corresponding to the external terminals 8 of FIG. When the resistance between the cases 58 and 59 is measured, the contact resistance value of the contact of the breaker 3 is obtained. By comparing this measured value with the reference value similar to the said Example, the method of this invention can be implemented. As described above, the present invention has a process of measuring a resistance value between the external terminals which lead the terminals of both ends of the breaker to the outside and a process of comparing the measured value with a reference value measured in advance. Judging by the status, it is superb whether or not to exchange. For this reason, it is not necessary to remove or dismantle the sealed containers such as tanks at every inspection.

Claims (1)

At least one pair of contactor devices in a closed container (tank), electrical contact with the contactor device, and a storage contactor device connected to each other, so that both movable shaft contactors of the contactor device and the resistance contactor device are disposed outside the container. In a hermetic opening / closing device mechanically connected between devices by a transmission device, the handwheel 48 is connected to the handwheel 48 so that rotation of the handwheel 48 is closed to both movable side contacts 18, 23, and 27. Screw propulsion mechanism (connector 46, connecting rod 47) transmitted to the transmission device by the operating force, the first display (guideline 45) connected to the transmission device, and the second display relatively fixed in correspondence to the first display ( And the first and second markings indicate the closing positions of the contactor device and the resistance contactor device, respectively.