JPS63152827A - Gas breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gas circuit breaker (hereinafter referred to as GCB), and particularly to a gas circuit breaker (GCB) equipped with a current measuring device in a tank housing a circuit breaker.
Regarding B.

[Conventional technology]

Typically, a GCB uses a metal tank formed into a cylindrical shape, arranged vertically or horizontally, and filled with an insulating gas such as SFe gas. At least one interrupter is housed within the tank and supported in position by a support insulator. The interrupting section is usually equipped with at least a fixed contact, a movable contact, and an arc extinguishing device such as a buffer device, and a current-carrying member such as a conductor of a bushing is connected to the fixed and movable contacts to reach the outside of the tank. ing. For example, in the event of a ground fault in the circuit, the movable contact of the interrupting part is driven in the opening direction to interrupt the circuit by an operating device installed outside the tank, and after the circuit is restored, it is driven in the closing direction to close the circuit. The contact is then reconnected to the fixed contact.

By the way, the operation of the cutoff section of the GCB is carried out by an operating device that detects a circuit current by means of variable current paths provided on both sides of the cutoff section, and is given a drive command in accordance with this value.

As such a current transformer, a through-type current transformer is generally used in which a secondary winding is wound around an annular core. Each type of current transformer is used by fitting into the mounting base of a bushing in a tank-type GCB in which both ends of the interrupting part are connected to the overhead line via a bushing, and in a GCB for gas-insulated switchgear, It is designed to be used by fitting it to a current-carrying conductor located at a location within the tank where there is no problem with insulation. In this way, GCJ3
In the structure in which the current transformer is fitted in a specific location, there is a problem that not only the current transformer itself becomes large but also the entire GCB becomes large and heavy.

For this reason, it has also been proposed to apply a so-called optical current transformer, a measuring device that uses Faraday effect glass or a similar measuring element to transmit an optical signal through an optical fiber and measure the current, to the GCB. (Refer to Japanese Utility Model Application No. 60-159381 and Japanese Utility Model Application No. 60-139382) (Problem to be solved by the invention) When applying a photometric flow device to a GCH, it is necessary to extend the gas space of the optical fiber to the ground side. Routing leads to deterioration of insulation performance due to electric field concentration, so to improve this, it is possible to transmit optical signals from the high voltage side to the ground side through the gas space, but the light emission phenomenon inside the GCB may cause disturbances. In addition, it is difficult to assemble the optical axis of the light transmitting side lens and the receiving side lens to match the optical axis of the optical signal sending side lens and the receiving side lens, and there is a risk that the optical axis may become misaligned after long-term use. In addition, even if we try to eliminate the drawbacks of spatial transmission by utilizing a hollow insulating space for optical signal transmission, GC
In B, optical current transformers, which are current measuring devices, must be placed on both sides of the interrupting section.To explain this using an example of a GCB of one interrupting section, optical current transformers are installed on both the fixed contact side and the movable contact side. If you install a current transformer and try to measure the signals from each current transformer, for example, by collecting all the optical signals on the movable element side where the operating device is located.

A drawback is that it is difficult to create a structure that allows optical signals to be transmitted across the fixed contact without adversely affecting the blocking portion or the optical signal. This drawback is especially true for GCBs where the fixed contact side is not supported at all insulated from the tank.

This is a particularly big problem.

An object of the present invention is to provide a GCB that does not reduce insulation performance and does not adversely affect optical signals even when configured to transmit optical signals of a current measuring device across a cut-off part. There is a particular thing.

[Means for solving problems]

In the gas circuit breaker of the present invention, at least one insulating member having at least one hollow hole is provided between the fixing part of the interrupting part connected to the current-carrying conductor connected to the external circuit and the bracket on the movable contact side. , and a current-measuring element is arranged on each current-carrying conductor part, and the current-measuring element on one side transmits an optical signal through a hollow hole in an insulating member to a measuring device provided on the other side. .

[Effect]

In this way, the hollow hole formed in the insulating member mechanically connects the fixed and movable contact side of the interrupting part.

Since it is used as a transmission path for the optical signal of the current measurement element, the optical signal for current measurement can be accurately transmitted without adversely affecting the insulation performance of the interrupting part.

〔Example〕

In the vertical GCB shown in FIGS. 1 and 2 of the present invention, a tank 1 formed in a cylindrical shape, for example, is vertically established on an operating device 16 that also serves as a mount, and a tank 1 in the axial direction inside the tank 1 is vertically installed. The two cut-off parts 2 are accommodated and fixed at a predetermined position by a hollow insulating support member 14. In this example, the cutoff section 2 is a hollow insulating support member 1.4 through which an operating rod 14 is passed through a bracket 6 which is in a cutoff state and also serves as a current carrying section.
As is well known, there is a fixed contact 3, a movable contact 4 which is arranged correspondingly to the movable contact 4, which moves towards and away from the fixed contact 3, and a high-pressure insulating gas to be sprayed when the movable contact 4 opens and closes. The arc extinguishing device 5 includes a buffer cylinder and a piston, and further includes a partial pressure element, a shield ring, and the like. The movable contact 4 and the arc extinguishing device 5 are supported by a bracket 6, and the fixed contact 3, which faces the movable contact 4, is also coupled to and supported by the bracket 6 by at least one insulating member 11.

A current-carrying conductor 12 is connected to the fixed contact 3, and a current-carrying conductor 1 provided on a bracket 6 that also serves as a current-carrying part is connected to the movable contact 4.
3, and each current-carrying conductor 12.13 is
Each bushing 10 installed at the upper end and diagonally upward of the tank 1
It is electrically connected to the center conductors 9a, 9b of the electrodes 9a, 10b by, for example, tulip-shaped contacts 8a, 8b. Each current-carrying conductor 12.13 is provided with a current measuring element 7a, 7b, respectively. Each current measuring element 7a, 7
In this example, since the well-known Faraday effect glass is used, b is fitted to each of the current-carrying conductors 12 and 13 and fixed at a location where it will not be affected by the arc or decomposed gas generated at the interrupting part. In addition to the above-mentioned current measuring elements 7a and 7b, an optical fiber wound thereon may be fitted or disposed close to the current-carrying conductor 12, 13, or a similar element may be used as appropriate. Current measuring element 7a.

As will be described later, an optical signal guided through an optical fiber from a light emitting section of a measuring device is input to 7b.

The optical signals emitted from these are similarly guided to the light receiving section by optical fibers, the optical signals are converted into electrical signals by a conversion element such as a photodiode, and the current flowing through each current-carrying conductor 12, 13 is measured.

The current measuring element 7a provided on the current-carrying conductor 12 on the side of the fixed contact 3 is connected to a light emitting part and a light receiving part provided in a measuring device I (not shown) provided in a lower part of the operating device 16 outside the tank 1. In order to transmit and receive optical signals between the two, optical transmission means, which is shown enlarged in FIG. 2, is provided. The light transmission means of this current measuring element 7a is an insulating member 11 that straddles the cutoff section 2.
A hollow hole 18 is formed, a lens 19 is fixed to the bracket 6 or a member on the fixed contact 3 side so as to face both ends of the hollow hole 18, and an optical fiber 17 is provided facing the lens 19 at both ends. As a result, even when an optical signal is spatially transmitted from the fixed contact 3 side to the movable contact 4 side across the blocking section 2 as shown by the broken line, the optical signal is not affected by disturbances such as arcs, so the current can be measured reliably, and since the insulating member 11 is utilized, the insulating performance of the interrupting section 2 can be constructed without any loss.

In this embodiment, the insulating members 11 are made of epoxy resin or glass fiber reinforced plastic in an arc shape as shown in FIG. However, the insulating member 11 may be formed in the form of an arc or may be formed in a cylindrical shape to insulate and support the fixed contact side. As described above, one or more hollow holes 18 are formed in this insulating member 11 so that the round trip can be shared as an optical signal path for the light emitting part measurement and the light receiving part side of the measuring device, or each can be used as an independent optical signal path. It is also possible to use a plurality of light-receiving parts on the light-receiving part side so that current measurement can be performed in the same way as when several current transformers are arranged in a normal GCB. Inside the hollow hole 18 formed in the insulating member 11, there is an SF generated at the time of interruption.
In order to prevent deterioration of the hollow hole surface due to e-gas decomposition gas,
It can also be used by enclosing an adsorbent.

The insulating member 11 may be used alone with only the hollow hole 18 formed therein, but if a voltage dividing element such as a capacitor is used in the interrupting part 2, the structure can be simplified by embedding it at the same time. can be converted into Of course, both the insulating member 18 in which the hollow hole 18 is formed and the insulating member in which the voltage dividing element is embedded can be used at the same time.

Current-measuring elements 7 arranged on both current-carrying conductors 12.13
The optical fibers 18 and 20, which are part of the optical signal transmission path to the optical signals a and 7b, are guided into the bracket 6 and reach the measuring device, but in the example shown in FIGS.
3(b).
As shown in FIG. 2, by forming a plurality of hollow holes 21 for each of the current measuring elements 7a and 7b and providing lenses 22.23 in correspondence with each other, and by arranging optical fibers 18.20 to face each other, measurements as shown by broken lines can be made. It is used as a spatial transmission path for optical signals to the equipment side. With such a structure, unlike the case where the optical fibers 18 and 20 are led to the measuring device side, it is possible to construct the insulating support member 14 without increasing the length of the insulation from the power-applying section.

In FIG. 1 described above, the interrupting part 2 is arranged in a vertical tank 1, and the fixed and movable contacts 3 and 4 of the interrupting part 2 are connected by an insulating member 11, and the interrupting part 2 is insulated. It is a vertical GCB fixed to one end side of the support member 14, and the current measuring elements 7a and 7b provided on each of the current-carrying conductors 12 and 13 on the fixed and movable contact side are used to measure all measurement optical signals outside the tank 1. Since the current is measured by transmitting it to the device, there is no adverse effect on the insulation support of the interrupting section 2, and it is possible to accurately measure both currents.

Another embodiment shown in FIG. 4 is one in which the present invention is applied to a horizontal GCB, and the same or similar parts as in FIG. 1 are given the same reference numerals.

A tank 1 is arranged horizontally, and one end of the tank 1 is provided with the operating device 12 of the cut-off part 2 disposed inside, and the other end is provided with the optical signal gathering part 24 of each current measuring element 7a, 7b. Measuring device 25 installed at any location from signal gathering section 24
The current is measured in each case. Therefore, in this structure, the interrupting part 5 includes an insulating support member 14 that fixes the bracket 6 on the movable side, and a bracket 26 that also serves as a current path for mounting the fixed contact 3 and the current-carrying conductor 12.
The insulating member 1 is supported by an insulating support member 27 that fixes the insulating member 1 and connects the movable side and fixed side brackets 6 and 26.
1, and the hollow hole 18 of this insulating member 11 is used as a spatial transmission path for optical signals together with the optical fiber 20 installed opposite to the current measuring element 7b on the movable side. A plurality of hollow holes 28 are also formed in the insulating support member 27 on the fixed contact 3 side, and the optical signals are collected by using them as spatial transmission paths for the optical signals of the current measuring elements 7a and 7b on the fixed side and the movable side. It is arranged to reach part 24.

In this way, in the horizontally arranged tank 1, the optical signal collecting section 24 and the measuring device are placed on the opposite side from the operating device 12! 25
Even in the case where a current measuring element 7a is provided on both of each current-carrying conductor 12.13.

7b optical signals can be transmitted without any problems, and there are operating devices at both ends of tank 1! 12, optical signal gathering section 25 and measuring device! Since the 25 side is separated, not only can both sides fully perform their respective functions without any hindrance, but also maintenance and inspection can be easily performed.

In the above-mentioned horizontal type GCB, the optical signal of each current measuring element can also be guided to the operating device side in the same way as the vertical type described above, and if there are multiple cut-off parts, the cut-off part is located in the center. The structure is such that the optical signals of the left and right current measuring elements are collected across the respective cut-off parts on the bracket part where the link mechanism is provided, and the optical signals are transmitted from this bracket part to the measuring device part in the operating device outside the tank. You can also.

Furthermore, in the configurations of the vertical and horizontal GCBs described above, an independent structure including a bushing was explained.

By connecting the busbar to the opening of the tank and connecting the interrupting part to the busbar conductor, it is also possible to apply it to a GCH for a so-called gas-free switchgear that is combined with other electrical equipment.

〔Effect of the invention〕

If the GCB is configured as in the present invention, even if a current measuring element is provided on each current-carrying conductor in the tank, the current can be measured by utilizing the hollow hole of the insulating member that straddles the interrupting part. Not only can the optical signal of the element be transmitted to the same location without being affected by ambient light such as arcs, allowing accurate current measurement, but it also reduces the loss of insulation properties compared to transmitting the optical signal using optical fiber alone. It can be configured without any hassle. Furthermore, since the insulating member forming the hollow hole is also utilized as a support material on the fixed contact side, a vertical GCB can be easily constructed. Furthermore, horizontal GCBs, in which the interrupting part is supported by insulating support members on the fixed and movable sides, and the optical signal gathering part and measuring device are installed on the side opposite to the operating device side, are easy to manufacture because both are independent. What's more, it has the effect of making maintenance and inspection easier.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical sectional view showing a gas circuit breaker which is an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 (a).
is a cross-sectional view taken along line A-A in FIG. 2, FIG. 3(b) is a cross-sectional view taken along line B-B in FIG. 2, and FIG. 4 is a gas circuit breaker according to another embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1...tank, 2...blocking part, 3...fixed contact, 4...movable contact, 5...arc extinguisher, 6,26...
...Bracket, 7a, 7b...Current measuring element, 11
...Insulating material. 12.13... Current-carrying conductor, 14.27... Insulating support member, 16... Operating device, 18.28... Hollow hole.

Claims (1)

[Claims] 1. A cutoff section having at least a fixed contact, a movable contact driven by an operating device, and an arc extinguishing device is disposed in a tank filled with insulating gas, and the cutoff section has at least a movable contact. The tank is supported by a hollow insulating support member fixed to a bracket provided on the contact side, and the fixed and movable contacts are provided with a current-carrying conductor connected to an external circuit, and the fixed contact side and the movable contact side are The brackets are mechanically connected by at least one insulating member having at least one hollow hole, and a current measuring element is disposed in each of the current-carrying conductor parts, and the current measuring element on one side is connected to the insulating member. A gas circuit breaker characterized in that an optical signal is transmitted through a hollow hole to a measuring device provided on the other side. 2. In claim 1, the insulating member is
A gas circuit breaker characterized by being formed into an arc shape surrounding fixed and movable contacts. 3. A gas circuit breaker according to claim 1, characterized in that a partial pressure element of a shutoff portion is embedded in the insulating member. 4. The gas circuit breaker according to claim 1, wherein each of the current-carrying conductors is connected to a center conductor of each bushing attached to the tank. 5. The gas circuit breaker according to claim 1, wherein the current measuring element is a glass current transformer that fits into a current-carrying conductor. 6. An operating device is provided on the lower end side of a vertical tank filled with insulating gas, and a cutoff section having at least a fixed contact, a movable contact driven by the operating device, and an arc extinguishing device is placed in the tank on the axis of the tank. The blocking part is supported at the bottom of the tank by a hollow insulating support member fixed to a bracket provided at least on the movable contact side, and the fixed and movable contacts are provided with a current-carrying conductor connected to an external circuit, The stationary contact side and the movable contact side bracket are supported by at least one insulating member mechanically coupled to each other,
At least one hollow hole is formed in the insulating member, a current measuring element is fitted and supported in each of the current-carrying conductor parts, and the current measuring element on the fixed contact side transmits an optical signal through the hollow hole in the insulating member. A gas circuit breaker characterized by transmitting data to an external measuring device. 7. An operating device is provided on one side of a horizontal tank that encloses insulating gas, and a cutoff section that includes at least a fixed contact, a movable contact driven by the operating device, an arc extinguishing device, etc. is installed in the tank. The cut-off part is arranged horizontally on the axis, and the fixed contact side is supported on the tank by an insulating support member via a bracket, and the tank is supported by a hollow insulating support member fixed to a bracket provided on the movable contact side. The fixed and movable contacts are provided with current-carrying conductors connected to an external circuit, and at least one insulating member having at least one hollow hole is provided between the brackets on the fixed contact and movable contact sides. A current measuring element is arranged on each of the current-carrying conductor parts, and the current measuring element on the movable contact side guides an optical signal to the bracket on the fixed contact side through the hollow hole of the insulating member, and A gas circuit breaker, characterized in that transmission is transmitted to a measuring device provided on the other side of a tank through a hollow hole in a support member.