JPH04296418A - Gas insulated switching device - Google Patents

Abstract

PURPOSE:To decrease the number of control lines for connecting constituent machineries of a gas insulated switching device with its control panel, and improve the stability and the reliability of a control system in the gas insulated switching device. CONSTITUTION:In a gas insulated switching device, a main bus wire 21 is electrically communicated, via a bus wire side disconnector 23b, a circuit breaker 22, and a line side disconnector 23a, with a power-transmission line or the like at a power cable connecting part 24. A ground switching device 25 for a line is provided between the line side disconnector 23a and the power cable connecting part 24. And a machinery side control panel 26 is mounted in the vicinity of the gas insulated switching device, composite cable 27, which is a compound of a copper wire for a power supply and an optical fiber for control demand/signal, is laid to constitute a control circuit, as a control wire mounted between respective machineries comprising the gas insulated switching device.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear using an optical signal in a control circuit which has a long life and is resistant to noise such as surges.

0002

2. Description of the Related Art Generally, the operation control section of a gas insulated switchgear uses a low voltage power source such as 100 V DC and 200 V AC to control opening/closing and drive source energy. For example, in a hydraulically operated circuit breaker, a high-pressure hydraulic system of 250 kgf/cm2 or more is installed in the operating device section of the main body, a predetermined hydraulic pressure is obtained by driving an oil pump with an electric motor, and this pressure is applied to a solenoid valve. The main contacts of the circuit breaker are opened and closed.

FIG. 4 shows a conventional circuit breaker control circuit. That is, one end of the control switch inlet contact 3a is connected to the DC positive side (P side) power supply bus 1, and the other end is connected to the auxiliary switch A contact 4 of the circuit breaker body and the A contact 5a of the auxiliary relay X. ing. Further, the auxiliary switch A contact 4 and the A contact 5a of the auxiliary relay X are connected in parallel to each other and connected to the coil of the auxiliary relay X5,
Further, the other end is connected to a DC negative electrode side (N side) power supply bus 2.

The P-side power supply bus 1 and the coil 6 of the circuit breaker closing solenoid valve are connected via the control switch inlet contact 3a and the B contact 5b of the auxiliary relay It is connected to the N-side power supply bus 2 via a pressure switch 9 for controlling pressure conditions, etc. Furthermore, in the trip circuit, one end of the coil 7 of the cut-off solenoid valve is connected to the P-side power supply bus 1 via the control switch cut-off side contact 3b, and the other end is connected to the auxiliary switch of the circuit breaker body connected in series. It is connected to the N-side power supply bus 2 via the A contact 8 and a pressure switch 10 for controlling operating oil pressure conditions.

In the circuit breaker status indicator light circuit, one end of the inlet indicator light 13a is connected to the P-side power supply bus 1 via the auxiliary switch A contact 11 of the breaker body, and the other end is connected to the N-side power bus 1. It is connected to the power supply bus 2. Similarly, one end of the off-side indicator light 13b is connected to the auxiliary switch B contact 1 of the circuit breaker main body.
2 to the P-side power bus 1, and the other end is connected to the N-side power bus 2.

[0006] In the figure, the framed portion is provided within the operating device section of the circuit breaker main body, and the other portions are provided in the machine side control panel. Although not shown, the control circuit for the hydraulic system is composed of a motor in the breaker operating device, a pressure switch for detecting oil pressure, a circuit breaker in the machine control panel, an electromagnetic contactor, a thermal relay, etc. has been done.

[0007]

[Problems to be Solved by the Invention] However, in the conventional circuit breaker as described above, the number of electric wires connecting the machine side control panel and the circuit breaker main body is smaller than the number of wires used for remote monitoring panels or protection relays. Including the auxiliary switch, 50~2
The number of cables is about 50 per unit, and even if a multi-core control cable is used, the number of cables is 4 to 15 per unit. Furthermore, in gas-insulated switchgear, a machine-side control panel is usually provided for each circuit including the above-mentioned circuit breaker and disconnectors and grounding switches installed before and after the circuit breaker. Since a control circuit is also configured, the number of control lines increases further.

[0008] Therefore, even if multi-core control cables are used, the number of cables will be considerable. In addition, since multi-core control cables are generally housed in metal conduits and installed, it takes a long time to assemble them, and the wiring time for ultra-high voltage class gas-insulated switchgear is The reality is that the time required is equivalent to the time required to assemble the main body.

[0009] Furthermore, as the voltage of gas insulated switchgear becomes higher, there is also concern about the influence of main circuit surges. In other words, it is well known that auxiliary switches and auxiliary relays used in control circuits open and close using electromagnetic valves or relay coils as a load, so arcs are generated when the contacts open and close. . In particular, contact relays used in DC circuits have surge voltage values of 1,000 to several thousand volts.
The surge had to be suppressed using surge absorbers, etc. Furthermore, since the contacts are worn out by arc energy during opening and closing, maintenance and inspection work must be performed periodically and contacts must be replaced as appropriate.

[0010]Furthermore, in recent years, the size of the component equipment in gas-insulated switchgear has progressed, so the space for installing the control cable is also small, and depending on the arrangement of the equipment, the control cable may have to be bent when it is installed. There was a risk that excessive force would be applied.

The present invention was proposed to solve the above-mentioned drawbacks of the prior art, and its purpose is to reduce the number of control lines connecting the components of a gas-insulated switchgear and its control panel. It is an object of the present invention to provide a gas insulated switchgear having a control system that can be reduced in size and has high stability and reliability. [Structure of the invention]

0012

[Means for Solving the Problems] The present invention provides a gas insulated switchgear in which an optical signal is used in a part of a control circuit disposed between a component of the gas insulated switchgear and a control panel. The device is characterized in that the components of the insulated switchgear and the control panel are connected by a composite control cable configured by integrating control signal optical fibers and control electric wires.

[0013]

[Operation] According to the gas insulated switchgear of the present invention, since the components of the gas insulated switchgear and the control panel are connected by a composite control cable equipped with optical fibers,
The number of cables to be installed can be significantly reduced compared to when the control circuit is entirely composed of control wires. Also,
Since optical signals are used, the use of contact relays can be minimized, arcing can be prevented from occurring when the contacts are opened and closed, and the stability and reliability of the control system can be improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 3. FIG. 1 shows an example of a system diagram of one line of a gas-insulated switchgear. That is, in the gas insulated switchgear, from the main bus bar 21 to the bus bar side disconnector 2
3b, a circuit breaker 22, and a line-side disconnector 23a, the power cable is connected to a power transmission line or the like at a power cable connecting portion 24. In addition, the track side disconnector 23a and the power cable connecting portion 2
4, a line grounding switch 25 is provided.

On the other hand, the machine side control panel 26 is installed near the gas insulated switchgear, and serves as a control line between the power supply copper wire and the control wires arranged between each device constituting the gas insulated switchgear. A composite control cable 27 comprising optical fibers for commands and signals is laid to constitute a control circuit.

FIG. 2 shows a specific example of the composite control cable 27. That is, several coated electric wires (copper wires) 29 and six coated optical fibers 30 are housed in the cable jacket 28 to form the composite control cable 27.

Furthermore, FIG. 3 shows a specific control system diagram using a circuit breaker as an example. In other words, the machine side control panel 2
A composite control cable 27 is installed between the circuit breaker 6 and the operating device section 31 of the circuit breaker. In addition, this composite control cable 2
The DC positive electrode side of the control power source is transmitted through the covered electric wire 29a in 7, and the DC negative electrode side of the control power source is transmitted through the covered electric wire 29b.

The covered wire 29a is connected to a closing solenoid valve coil 33 via an optical thyristor 32a for driving a closing solenoid valve provided in an operating device section 31 of the circuit breaker. Furthermore, the other end of this closing solenoid valve coil 33 is connected to a limit switch 3 that turns off when the closing operation is completed.
It is connected to the negative side power supply via 5a.

On the other hand, an optical fiber 30 is connected to the gate of the optical thyristor 32a for driving the closing solenoid valve.
A programmable controller (PC) 38 housed in the machine-side control panel 26 is connected to it, and is configured so that a light injection command can be sent. Further, the cut-off control side is also configured in a similar manner. That is, the covered electric wire 2
9a is connected to the cut-off electromagnetic valve coil 34 via an optical thyristor 32b for driving the cut-off electromagnetic valve provided in the operating device section 31 of the circuit breaker. The other end of this solenoid valve coil 34 for shutoff is connected to the negative power source via a limit switch 35b that is turned off when the shutoff operation is completed.

On the other hand, a programmable controller 38 housed in the machine side control panel 26 is connected to the gate of the optical thyristor 32b via an optical fiber 30, and is configured to send a light cutoff command. There is. Note that the closing/cutting solenoid valve coils 33 and 34 include:
A resistor 36 for suppressing surge is connected to each of the coils, and is configured to suppress surge when the coil is cut off.

Further, on/off signals for indicating the status of the circuit breaker, etc. are transmitted in the following manner. In other words, the machine side control panel 2
The programmable controller 38 housed in the circuit breaker 6 sends light via the optical fiber 30a to the shielding plate 37 provided in the mechanical part of the operating device part 31 of the circuit breaker, and the light detected by the movement of the shielding plate 37 is transmitted through the optical fiber 30a. programmable controller 38 via optical fiber 30b.
is configured to be sent back to This monitors the on/off state of the circuit breaker.

[0022] It is well known that the programmable controller 38 can easily set conditions or amplify detection information of the on/off state of the circuit breaker by appropriately programming the programmable controller 38. be. Further, it goes without saying that control circuits such as a disconnector and a grounding switch can also be constructed in the same manner.

In the gas insulated switchgear of this embodiment having such a configuration, the operation control commands and status display signals are optical information transmitted through optical fibers, so the number of control lines can be significantly reduced. This greatly reduces the number of man-hours needed to assemble gas-insulated switchgear. Further, it is possible to configure a control system that is not affected by main circuit surges of the components of the gas-insulated switchgear. Furthermore, since there are very few contact points, reliability is greatly improved, maintenance can be streamlined, and it is also economical.

Furthermore, in gas-insulated switchgear, where component equipment has been downsized in recent years, the space for installing control cables is also small, and depending on the arrangement of the equipment, excessive force may be applied to the control cables when installing them. However, by using the composite control cable according to the present invention, workability and reliability are greatly improved, and
Further downsizing of gas insulated switchgear becomes possible.

Note that the present invention is not limited to the embodiments described above, and the configuration of the composite control cable may be changed as appropriate depending on the circuit configuration of the components of the gas-insulated switchgear and its control panel. Can be done.

[0026]

[Effects of the Invention] As described above, according to the present invention, the components of a gas-insulated switchgear and the control panel are connected by a composite control cable configured by integrating control signal optical fibers and control electric wires. By doing so, it is possible to reduce the number of control lines and provide a gas insulated switchgear equipped with a highly stable and reliable control system.

[Brief explanation of drawings]

[Fig. 1] System diagram showing an embodiment of the gas-insulated switchgear of the present invention.

[Fig. 2] A side view showing the configuration of a composite control cable used in the gas-insulated switchgear of the present invention.

[Figure 3] Control system diagram when the present invention is applied to a circuit breaker

[
Figure 4: Conventional circuit breaker control circuit diagram

[Explanation of symbols]

21...Main bus line 22...breaker 23a...Line side disconnector 23b...Bus bar side disconnector 24...Power cable connection part 25...Line grounding switch 26…Machine side control panel 27…Composite control cable 28...Cable jacket 29...Sheathed wire 30...Coated optical fiber

Claims (1)

[Claims] 1. A gas insulated switchgear in which an optical signal is used in a part of a control circuit disposed between a component of the gas insulated switchgear and a control panel, wherein the component of the gas insulated switchgear and the control panel are connected to each other. A gas-insulated switchgear characterized in that it is connected to the panel by a composite control cable that integrates control signal optical fibers and control wires.