JPH0676696A - Gas insulation switch - Google Patents

Abstract

PURPOSE:To provide a gas insulation switch such that the resistance value and soundness of a resistor for regulating a switching surge can readily be measured from the outside. CONSTITUTION:A gas insulation switch has a movable contact portion 2, a first fixed contact portion 3 and a movable contact 4, the contact portions 2, 3 being disposed opposite to each other inside a sealed container 1. A resistor shield 5 is disposed between the movable contact portion 2 and the first fixed contact portion 3 and is connected to the first fixed contact portion 3 via a resistor 6. The movable contact portion 2 and the first fixed contact portion 3 have a movable current-carrying contact 7 and a first fixed current-carrying contact 8, respectively. A second fixed contact portion 23 having a second fixed current-carrying contact 21 is provided in the resistor shield 5 and is connected in series with the resistor 6. The second fixed contact portion 23 is so designed that the movable contact 4 makes contact not with the first fixed current-carrying contact 8 but with the second fixed current-carrying contact 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switch with resistance used in a substation, and more particularly to a technique for easily confirming the soundness of a resistor from the outside.

[0002]

2. Description of the Related Art Generally, a gas-insulated switch includes a circuit breaker, a disconnector, a grounding switch, a current transformer, a transformer for a meter, etc. in a closed container filled with SF ₆ gas of about 3 to 6 atm. It is configured to house the equipment required for opening and closing operations. Among these gas-insulated switches, the switching operation of the disconnecting switch is usually performed with the breaker open. With such switching operation of the disconnector, a surge called disconnector surge occurs between the poles of the disconnector and propagates in the gas-insulated switchgear,
This disconnector surge threatens the insulation of the gas-insulated switch in the UHV class, and it is necessary to deal with it.

A system conventionally proposed for the purpose of suppressing the voltage level of the disconnector surge will be described below with reference to FIGS. 5 to 9. in this case,
5 and 6 are half cross-sectional views showing an example of the configuration of the disconnector. FIG. 5 shows a closed state and FIG. 6 shows an open state. Further, FIG. 7 is a principle diagram schematically showing the configuration of the same disconnector, FIG. 8 is an electric circuit diagram showing an opening / closing operation, and FIG. 9 is an electric circuit diagram showing a closed state.

First, as shown in FIGS. 5 and 6, a movable side contact portion 2 and a fixed side contact portion 3 are arranged to face each other in the center of the tank 1 so as to face each other in the axial direction. Between the movable side contact part 2 and the fixed side contact part 3, a movable contactor 4 extending coaxially with the contact parts 2 and 3 is provided.
This movable contactor 4 is slidable with respect to
However, the disconnector is opened and closed by constantly contacting the movable contact portion 2 and contacting and separating the fixed contact portion 3 from each other.

The movable contact portion 2 and the fixed contact portion 3
A resistor shield 5 is disposed between the resistor shields 5 so as to surround the movable contactor 4, and the fixed side contact portion 3 of the resistor shield 5 is disposed.
One to several resistors 6 capable of sufficiently suppressing the disconnector surge are attached to the end portion facing to, and the other end of this resistor 6 is attached to the fixed side contact portion 3. There is. Further, in the figure, 7 is a movable-side energizing contact provided inside the movable-side contact part 2, 8 is a fixed-side energizing contact provided inside the fixed-side contact part 3, and 9 is a movable-side contact part 2. It is a movable side shield provided on the outside.

A resistance contact 10 is provided inside the end of the resistance shield 5 opposite to the resistance 6 (the side facing the movable contact 2).
Are arranged so as to face the movable contactor 4 with a gap g in the closed state as shown in FIG. 5 and during the opening / closing operation not shown. In the gap g, the tip of the movable contactor 4 has a resistance contact 1 during the opening / closing operation of the disconnector.
When re-ignition occurs between the disconnector poles at a time near 0, the resistance contact 10 and the movable contactor 4 are energized by flashover, and at this time point, the movable contactor 4 and the fixed side contact portion are connected. 3 and the tank 1 are determined by performing sufficient examination in terms of insulation coordination so as not to cause dielectric breakdown.

The operation of the disconnector having the above structure is as follows. That is, in the closing operation,
First, the movable contactor 4 is driven from the open state as shown in FIG. 6 to move it to the fixed side contact portion 3 side. As a result, the tip of the movable contactor 4 reaches the vicinity of the resistance contact 10, but if re-ignition occurs between the disconnector poles in this state, the resistance contact 1
0 and the movable contactor 4 are energized by flashover, and an electric circuit 12 as shown in FIG. 8 is configured. Note that FIG.
Reference numeral 11 indicates the main contact of the disconnector. After that, the movable contactor 4 comes into contact with the fixed-side energization contactor 8 in the fixed-side contact portion 3 to enter the closed state as shown in FIG. The circuit 13 is configured, and the closing operation is completed.

Further, in the breaking operation, an operation opposite to the above-mentioned closing operation is performed. That is, the movable contactor 4 is driven from the closed state as shown in FIG. 5 to move to the movable side contact portion 2 side. Then, finally, as shown in FIG. 6, the tip of the movable contactor 4 is set inside the movable side shield 9, and the breaking operation is completed.

[0009]

By the way, it is known that the disconnector surge includes a high frequency component of several nanoseconds at the rise of voltage. Therefore, the potential distribution of the surge voltage inside the resistor may become uneven due to the internal inductance of the resistor itself and the floating capacitance between the resistor and surrounding conductors, tanks, etc. Will reduce the insulation performance. In addition, the transmission voltage is extremely high like UHV,
In addition, when the current switching operation is performed many times, the resistance of the resistor is deteriorated, and the insulation performance of the resistor is threatened.

For this reason, it is indispensable to make a pass / fail diagnosis of the resistor itself after long-term use. However, in the conventional disconnector as described above, in order to confirm the soundness of the resistor itself, it is necessary to directly confirm the resistor. For such confirmation, it is necessary to disassemble the device and perform a pass / fail diagnosis of the resistor, which not only requires a great deal of labor and time, but also greatly impedes the operation of the substation. Will cause The above-mentioned problems are present not only in the disconnecting switch but also in various gas-insulated switches having resistors for suppressing switching surges.

The present invention has been proposed to solve the problems of the prior art as described above, and an object thereof is to easily measure the resistance value and soundness of a resistor for suppressing switching surges from the outside. A possible gas-insulated switch.

[0012]

A gas-insulated switch according to the present invention comprises a movable contact portion, a first fixed contact portion, and a contact portion between the movable contact portion and the first fixed side portion, which are arranged to face each other in a closed container filled with an insulating gas. A movable contact that is movably provided between the parts and that can contact the movable-side contact part and can contact and separate from the first fixed-side contact part, and includes the movable-side contact part and the first fixed-side contact part. A resistor shield is arranged between the movable contactor and the movable contactor and the first fixed contactor is connected to the movable contactor via the resistor. A gas-insulated switch having a movable-side energizing contactor and a first fixed-side energizing contactor that can contact each other, and a second fixed-side energizing contactor that can contact the movable contactor in the resistor shield. 2 fixed side contact part is provided,
The fixed side contact portion is connected in series with the resistor, and the second fixed side contact portion is such that the movable contact does not come into contact with the first fixed side energizing contact and the second fixed side. It is characterized in that it is configured so as to be in contact with the energizing contact.

[0013]

According to the present invention having the above-described structure, the movable contact is brought into contact with the second fixed side energizing contact, and the movable contact is held at this position, whereby the second fixed side energizing contact is obtained. Since it is possible to configure a series electric circuit that passes through the resistor and the resistor while not passing through the first fixed-side energizing contactor (and therefore does not pass through the main contact), the resistor is used by using the series electric circuit. The resistance value of can be externally measured.
In particular, the soundness of the resistor can be easily confirmed by applying a predetermined lightning impulse voltage to the resistor.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the gas insulated switch according to the present invention is applied to a disconnecting switch will be specifically described below with reference to FIGS. Here, FIG. 1 is a half cross-sectional view showing the configuration of the disconnecting switch of the present embodiment, FIG. 2 is an electric circuit diagram showing an opening / closing operation, FIG. 3 is an electric circuit diagram showing a closed state, and FIG.
FIG. 3 is an electric circuit diagram showing the principle for measuring the resistance value and soundness of a resistor.

Tank containing SF ₆ gas (sealed container)
A movable side contact portion 2 and a first fixed side contact portion 3 are arranged to face each other in a central portion of the shaft 1 in the axial direction. A movable contactor 4 extending coaxially with the contact portions 2 and 3 is provided between the movable contact portion 2 and the first fixed contact portion 3 so as to be slidable with respect to the contact portions 2 and 3. The movable contactor 4 is always in contact with the movable side contact portion 2 and is in contact with and separated from the first fixed side contact portion 3 so that the disconnector is opened and closed. There is. The movable contactor 4 is driven by the driving force of an operating device (not shown).

A resistor shield 5 is arranged between the movable side contact portion 2 and the first fixed side contact portion 3 so as to surround the movable contactor 4, and the resistor body shield 5 has a first fixed side. One to several resistors 6 capable of sufficiently suppressing the disconnector surge are attached to an end portion facing the contact portion 3, and the other end of the resistor body 6 has a first fixed side contact portion. It is attached to 3. Further, in the figure, 7 is a movable side energization contactor provided inside the movable side contact part 2, 8 is a first fixed side energization contactor provided inside the first fixed side contact part 3, and 9 is a movable side. It is a movable side shield provided outside the contact portion 2.

A first resistance contact 10 is provided inside the end of the resistance shield 5 on the side opposite to the resistance 6 (the side facing the movable contact portion 2). The resistance contact 10 is connected to the movable contactor 4 and the gap g during the opening / closing operation as shown in FIG.
Are arranged so as to face each other. This gap g is determined by performing sufficient examination in terms of insulation coordination.

The structure up to this point is the same as that of the above-described conventional example, but in the present embodiment, the second resistance contact 20 and the second fixed side energizing contact 2 are provided in the resistor shield 5.
The second fixed-side contact portion 23 including the first and second springs 22 is provided. In this case, the second resistance contact 20 is arranged close to the first resistance contact 10 inside the end of the second fixed-side energizing contact 21 facing the movable contact 2. The second fixed-side energizing contact 21 is biased toward the movable contact 4 by the iterative spring 22, so that the second resistance is applied during the opening / closing operation as shown in FIG. The contact 20 is configured to maintain a contact state with the movable contact 4. In addition, in the present embodiment, since the second fixed side contact portion 23 is provided, the contact portion corresponding to the fixed side contact portion of the conventional example described above is referred to as the first fixed side contact portion. The portion corresponding to the fixed-side energizing contact is referred to as the first fixed-side energizing contact, and the portion corresponding to the resistance contact of the conventional example is referred to as the first resistance contact. However, it is substantially the same configuration. Therefore, the same reference numerals are given.

The operation of the disconnecting switch of the present invention constructed as described above is as follows. That is, in the closing operation, the movable contactor 4 is driven from an open state (not shown) and moved to the fixed side contact portion 3 side. As a result, the tip of the movable contact 4 has the first resistance contact 10 and the second resistance contact 2
0, but in this case, as shown in FIG.
The movable contactor 4 holds the position of the movable contactor 4 in a state where it opposes the resistance contact 10 with a gap g (and thus does not contact), but contacts the second resistance contact 20. In this state, the movable contact 4 has the second resistance contact 20
As shown in FIG. 2, a series electric circuit 24 that passes through the second resistance contact 20 and the resistor 6 but does not pass through the main contact 11 is formed. That is, the second fixed side contact portion 23
A series electric circuit 24 is formed that passes through the second fixed-side energizing contact 21 inside and the resistor 6 but does not pass through the first fixed-side energizing contact 8 inside the first fixed-side contact portion 3. As a method of holding the position of the movable contactor 4 in this way, for example, a manual operation method, a hydraulic operation method, or the like can be used.

After that, the movable contact 4 comes into contact with the first fixed-side energizing contact 8 in the first fixed-side contact portion 3, and the second resistance contact 20 and the resistor 6 are connected to each other as shown in FIG. A series electric circuit 24 that passes through and a series electric circuit 25 that passes through the main contact 11 are formed, and a parallel electric circuit composed of these electric circuits 24 and 25 is formed. That is, the second fixed side contact portion 23
A series electric circuit 24 passing through the second fixed side energizing contact 21 inside the first fixed side contact portion 3 and a series electric circuit 24 passing through the resistor 6 are formed. ,
A parallel electric circuit including these electric circuits 24 and 25 is configured, and the closing operation is completed.

Further, in the breaking operation, an operation opposite to the above-mentioned closing operation is performed. That is, from the closed state (not shown), the movable contactor 4 is driven and moved to the movable side contact portion 2 side, and finally the tip of the movable contactor 4 is set within the movable side shield 9 and the blocking operation is performed. Is completed.

By the way, as shown in FIG. 3, in a state where a parallel electric circuit is formed, the resistance passing through the first fixed side contact portion 3 is usually a value of μΩ level, whereas the resistance of the resistor 6 is small. Since the value is a value of about 500Ω which can sufficiently suppress the surge, the difference in resistance value is significantly larger in the resistor 6. For this reason, it is impossible to measure the resistance value of the resistor 6 in a state where the movable contactor 4 is completely supplied.

However, in this embodiment, as shown in FIG.
As shown in FIG. 2, by holding the movable contactor 4 in the middle, as shown in FIG.
Since a series electric circuit 24 that passes through the fixed-side energizing contact 21 and the resistor 6 but does not pass through the first fixed-side energizing contact 8 in the first fixed-side contact portion 3 can be configured, this electric circuit 24
By measuring from both ends, the resistance value of the resistor 6 can be measured. As a measuring method of such a resistor 6, as shown in FIG. 4, it is possible to measure using a ground switch 27 which is usually provided at both ends of the disconnector 26.
In the figure, 28 is a circuit breaker.

By the way, the cause of the defect of the resistor 6 is disconnection and short circuit. In the case of disconnection, it is possible to confirm the soundness at a low voltage, but in the case of a short circuit, it is difficult to confirm the soundness at a low voltage. Therefore,
In the case of a short circuit, a relatively high lightning impulse voltage or the like is applied to the electric circuit 24 to measure the short circuit state when the high voltage is applied. Further, as shown in FIG. 4, when the measurement is performed through the grounding switch 27, no special structure is required, so the measurement can be easily performed, and there is a performance problem even when a high voltage is applied. Will not occur.

As described above, in this embodiment, the second fixed side contact portion 23 having the second fixed side energizing contact 21 is provided in the resistor shield 5, and the movable contact 4 is connected to the second fixed side. By holding the movable contactor 4 in contact with the current-carrying contactor 21, a series electric circuit that passes through the resistor 6 and does not pass through the main contact 11 can be configured as shown in FIG. As shown in the figure, the resistance value of the resistor 6 can be measured from the outside by using the ground terminal of the ground switch 27, etc., and a high voltage lightning impulse voltage is applied to the resistor 6 to confirm the short-circuit mode. It is possible to confirm the soundness of the resistor easily.

Therefore, the work for disassembling the device, which is conventionally necessary for confirming the soundness of the resistor 6, can be omitted, and the working time for detecting the abnormality of the resistor 6 can be greatly shortened. As a result, it can contribute to shortening the line stop time,
It is possible to greatly improve the operational efficiency of the substation. further,
Since the soundness of the resistor 6 can be easily confirmed, it can contribute to the improvement of the reliability of the gas insulated switch itself.

The present invention is not limited to the above-mentioned embodiment, and the specific constitution of the second fixed side contact portion can be selected appropriately. Further, the present invention can be applied not only to the disconnector but also to various gas-insulated switches having resistors for suppressing switching surges.

[0028]

As described above, according to the present invention,
The second having the second fixed side energizing contact in the resistor shield
Since the fixed contact portion is provided and the movable contact is held in a state where the movable contact is in contact with the second fixed energizing contact, a series electric circuit that passes through the resistor and does not pass through the main contact can be configured. It is possible to provide a gas-insulated switch capable of easily measuring the resistance value and soundness of a resistor for suppressing a switching surge from the outside.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment in which a gas-insulated switch according to the present invention is applied to a disconnecting switch, and in particular, a half sectional view showing a middle of a switching operation.

FIG. 2 is an electric circuit diagram showing an opening / closing operation of the disconnector of FIG.

FIG. 3 is an electric circuit diagram showing a closed state of the disconnector of FIG.

FIG. 4 is an electric circuit diagram showing the principle for measuring the resistance value and soundness of the resistor of FIG.

FIG. 5 is a diagram showing an example of the configuration of a conventional disconnector, and in particular, a half cross-sectional view showing a closed state.

FIG. 6 is a half cross-sectional view showing an open state of the disconnector of FIG.

FIG. 7 is a principle view schematically showing the configuration of the disconnector of FIG.

FIG. 8 is an electric circuit diagram showing the opening / closing operation of the disconnector of FIG.

9 is an electric circuit diagram showing a closed state of the disconnector of FIG.

[Explanation of Codes] 1 ... Tank (closed container) 2 ... Movable side contact part 3 ... First fixed side contact part 4 ... Movable contactor 5 ... Resistor shield 6 ... Resistor 7 ... Movable side energizing contactor 8 ... No. 1 Fixed-side energizing contact 9 ... Movable-side shield 10 ... First resistance contact 11 ... Main contact 20 ... Second resistance contact 21 ... Second fixed-side energizing contact 22 ... Ita spring 23 ... Second fixed-side contact part 24, 25 … Electrical circuit 26… Disconnector 27… Ground switch 28… Breaker

Claims (1)

[Claims] 1. A movable side contact portion and a first fixed side contact portion, which are arranged to face each other in an airtight container filled with an insulating gas, and a movable side contact portion which is movably provided between these contact portions. Has a movable contactor that can contact with and separate from the first fixed-side contact portion, and a resistor shield is disposed between the movable-side contact portion and the first fixed-side contact portion. A shield is connected to the first fixed side contact portion via a resistor,
A gas-insulated switch in which the movable side contact portion and the first fixed side contact portion each have a movable side energization contactor and a first fixed side energization contactor capable of contacting the movable contactor, wherein A second fixed side contact portion having a second fixed side energizing contact element capable of contacting with the movable contact element, the second fixed side contact portion being connected in series with the resistor, and the second fixed side The contact portion is configured such that the movable contact can be in a state in which the movable contact does not contact the first stationary-side energizing contact and also contacts the second stationary-side energizing contact. Gas insulated switch.