JP3131501B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear in which a plurality of devices including a circuit breaker are housed in a grounded metal container together with an insulating gas. Related to preventive maintenance systems to perform.

[0002]

2. Description of the Related Art A gas insulated switchgear (GIS) uses an insulating gas such as SF6 gas having excellent insulation and arc-extinguishing properties to house and dispose substation equipment such as disconnectors and circuit breakers in a sealed container. Device. This gas insulated switchgear is k
It has the advantages of being able to reduce the installation volume per VA and being excellent in environmental resistance. Therefore, it is a substation facility that accompanies the recent rise in land prices and the increase in power supply in urban areas. It is widely used as a device that satisfies the necessity of strengthening and is in operation.

That is, in a gas insulated switchgear,
Due to the excellent characteristics of the insulating gas such as SF6 gas, the size of the storage device can be reduced, and the overall size can be reduced. As a result, the occupied volume per kV · A becomes small, the installation site can be reduced, and the installation site can be effectively used. In addition, a two- or three-stage stacking configuration using a gas-insulated bus is possible, and a block structure is used, so that a large area can be secured with a small area, and the installation site can be reduced from this point, and the installation site can be effectively used. It can be used. Furthermore, since the sealed container containing the equipment is grounded, there is no danger of electric shock even if approaching during power application, and the power application unit is directly exposed to environmental disturbances such as salt damage, wind and rain. There is also an advantage that there is no problem affected by these. Further, since various switches are arc-treated in an insulating gas having a high arc-extinguishing ability, there is an advantage that the breaking capacity per main contact can be greatly improved.

On the other hand, the gas insulated switchgear has the above advantages, but has the following disadvantages.

That is, since the size of the entire gas insulated switchgear is reduced, the size limitation of the disassembly work or the reassembly work at the time of maintenance and inspection of the storage equipment is small, so that the maintenance and inspection work takes time and the work efficiency is reduced. It will drop significantly. Insulating gas such as SF6 gas sealed in the container is expensive, and the production technology for preventing gas leakage to the outside becomes high-grade, and the insulating property is high.
Since V / mm is large, a decrease in gas pressure is sensitive to the insulation margin, and repair of gas leakage is urgent. Furthermore, since the closed container is used, there is a disadvantage that the storage device cannot be monitored visually. In addition, in the replacement work accompanying the consumption of the main contacts of various switchgears, there is a disadvantage that a large amount of time is required for the collection and refilling of the insulating gas, and the downtime of the gas insulated switchgear becomes longer.

When the advantages and problems described above are considered comprehensively, the gas-insulated switchgear is remarkably widespread because the advantages are large in terms of performance.
When mass production system is adopted, the maintenance and emergency repair system preparation and quality variation are not negligible problems. To cope with such a problem, there is an urgent need to establish a preventive maintenance system capable of confirming the reliability of the normal operating state and monitoring early detection of an abnormality.

The expected effect of such a preventive maintenance system will be specifically described with reference to FIG. Here, FIG. 4 is a model diagram showing a potential deterioration failure model when the vertical axis represents the potential characteristic L of the device and the horizontal axis represents the elapsed time t. That is, the initial level s is reduced to the parameter detection level a, then to the insufficient function level e, and then passes through the danger level f and leads to an accident. The elapsed time from the initial level s to the parameter detection level a is the degradation start area A, the warning area B is from the parameter detection level a to the insufficient function level e, and the elapsed time is from the insufficient function level e to the accident. It can be divided into an accident phenomena area C that leads to the accident.

[0008] In this case, the deterioration of the equipment accelerates at the danger level f and leads to an accident phenomenon with no time margin. Even if an abnormality is found in the area C, it may be too late. Therefore, it is desirable to find an abnormality in the preceding time region, that is, the warning region B from the parameter detection level a to the insufficient function level e. That is,
Since various abnormalities evolve over a long period of time as a physical phenomenon,
If an abnormality is found in the warning zone B, direct emergency measures such as emergency stop are not required, and there will be enough time for repair due to voluntary stoppage, and in addition, accidents such as primary or secondary damage during an accident phenomenon There is no enlargement phenomenon, and the repaired part can be limited to the minimum necessary range.

FIG. 5 is a configuration diagram showing an example of a system which is conventionally considered as a preventive maintenance system for a gas insulated switchgear and is expected to have the above-described effects. The preventive maintenance system shown in FIG. 5 includes a plurality of detection sensors 21, a monitoring panel 22, a master data processing unit 23, and an optical cable 24.
It is composed of That is, each detection sensor 21
It is attached to a gas insulated switchgear body (not shown). The monitoring panel 22 is usually provided near the gas insulated switchgear, and has a plurality of sensor receivers 25 corresponding to each detection sensor 21 and a data processing unit 26.
Further, the master-side data processing unit 23 is usually installed in the substation control room, and is connected to the monitoring panel 22 via the optical cable 24. During operation of the system, the output of each sensor 21 is output to the corresponding sensor receiver 2 of the monitoring panel 22.
5, the output of each sensor receiver 25 is subjected to a certain amount of arithmetic processing by a data processing unit 26, and then transmitted to a master data processing unit 23 via an optical cable 24.

FIG. 6 is a side view (A) and a front view (B) showing an example of the monitoring panel shown in FIG. The monitoring panel shown in FIG. 6 includes an outer box 51 and a GIS control unit 52 and a monitoring unit 53 housed therein. The inner box 54 of the monitoring unit 53 includes the sensor receiver 25 and the data processing unit 2 shown in FIG.
Electronic devices such as a sensor receiver 55 and a data processing / transmission device 56 are housed as devices corresponding to 6. The dehumidifier 60 and the heat exchanger 61 are provided to provide a good environment for these electronic devices. Is provided. The monitoring unit 5
3 is provided so that it can be pulled out of the outer box 51 by the rail 70.

FIG. 7 is a single-line diagram showing an example of the equipment connection and gas compartment of a conventional gas insulated switchgear for one line. The gas insulated switchgear shown in FIG.
The bus-side disconnectors 2, 3, connected to one end of the circuit breaker 1,
The circuit breaker 1 includes a disconnector 4, a grounding device 5, and a bushing 8 connected to the other end of the circuit breaker 1. The area surrounded by the two-dot chain line corresponds to each gas section of the gas insulated switchgear, and includes a gas section A1 including the circuit breaker 1, a bus-side disconnector 2,
A2, A3 each including the gasket 3 and the gas compartment A including the disconnector 4, the grounding device 5, and the bushing 8 collectively.
4 gas sections A1 to A4. A corresponding gas monitoring box 6 and a corresponding gas pressure sensor 10 are provided for each of the gas sections A1 to A4, and are connected to the corresponding gas sections via a gas valve 7. In this case, gas compartment A containing circuit breaker 1
In No. 1, in order to ensure the shut-off performance, the internal gas pressure is set to be higher than the gas pressures of the other gas sections A2 to A4 by about 1 to 2 kg / cm2.

FIG. 8 is a diagram showing the configuration of the gas monitoring box shown in FIG. 7. The gas monitoring box 6 has a pressure indicator 11 and a function of turning on an alarm contact when the gas pressure drops below a certain value. Gas density switch 12 having a valve and stop gas valve 1
3 is provided. The gas monitoring box 6 is attached to a ground tank 15 of a gas insulated switchgear via a gas valve 7 and a pipe.

FIG. 9 is a block diagram showing the configuration of the signal transmission system in the monitoring panel shown in FIG. 6 and the related gas monitoring box, gas pressure sensor, and temperature sensor. This figure 9
As shown in the figure, the gas density switch 12 in the gas monitoring box 6
Are connected to a fault indicator 71 in the GIS control unit 52 via a signal line 77 and to a circuit breaker control circuit 72 also provided in the GIS control unit 52. The circuit breaker control circuit 72 is set to lock the operation of the circuit breaker when the gas pressure decreases. The outputs of the gas pressure sensor 10 and the temperature sensor 78 attached to the gas insulated switchgear body are
After being transmitted to the sensor receiver 55 in 3, it is guided to a data processing / transmission device 56 for performing abnormality determination and the like, converted into an optical signal here, and installed in the substation control room via the optical cable 24. The data is transmitted to the parent data processing unit 23 (FIG. 5).

[0014]

However, in the conventional preventive maintenance system as described above, a system for monitoring the gas density of a plurality of gas compartments A1 to A4 and a system for monitoring the gas pressure are each provided with a plurality. Since each of them is present individually, the configuration is complicated, which complicates the configuration of the entire gas insulated switchgear and is not preferable from an economic viewpoint. In addition, in order to grasp the gas pressure of each of the gas sections A1 to A4, it is necessary to individually check the pressure indicator 11 in the gas monitoring box 6 corresponding to each of the gas sections A1 to A4. There is a problem.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and has as its object to provide a simple and reliable preventive maintenance system and a gas which is excellent in economic efficiency. An insulated switchgear is provided.

[0016]

According to a first aspect of the present invention, there is provided a gas insulated switchgear having a plurality of devices including a circuit breaker housed in a grounded metal container together with an insulating gas. In, a plurality of gas compartments are formed by dividing the plurality of appliances into a single appliance or a plurality of appliances selectively combined as units, and a plurality of gas compartments are formed, and among the plurality of gas compartments, a gas contained in the circuit breaker is provided. A gas pressure sensor and a gas density switch are provided in one section, and a gas pressure sensor is provided in another gas section, and the gas density switch is provided in an operation mechanism box of the circuit breaker. And

According to a second aspect of the present invention, in the gas insulated switchgear of the first aspect, a monitoring panel for monitoring and controlling the apparatus is provided at a site where the apparatus is installed, and the gas pressure sensor is provided on the monitoring panel. A circuit breaker control unit that locks the operation of the circuit breaker when the gas pressure drops based on the gas pressure data obtained in the step (a) and the gas density data obtained by the gas density switch.

[0018]

The operation of the first aspect of the present invention configured as described above is as follows. That is, since the gas density switch is provided only in the gas compartment including the circuit breaker, a gas monitoring box for another gas compartment can be omitted. In particular, by providing a gas density switch for the gas compartment including the circuit breaker in the circuit breaker operation mechanism box,
A dedicated gas monitoring box can be omitted. In this case, for the gas section not including the circuit breaker, necessary and sufficient control can be performed only by the gas pressure sensor, so that there is no problem even if the density switch is omitted.

According to the second aspect of the present invention, the operation lock of the circuit breaker at the time of gas pressure drop is performed based on the gas pressure data obtained by the gas pressure sensor and the gas density data obtained by the gas density switch. , The operation of the circuit breaker can be doubly controlled by both the pressure and density parameters, and the reliability of the control system can be improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas insulated switchgear according to the present invention will be described below in detail with reference to FIGS. First, FIG. 1 is a single-line diagram showing equipment connections and gas compartments in one embodiment of a gas insulated switchgear for one line according to the present invention. The basic configuration of the gas insulated switchgear shown in FIG. 1 is the same as that of the conventional example shown in FIG. That is, there are provided a circuit breaker 1, bus-side disconnectors 2 and 3 connected to one end of the circuit breaker 1, a disconnector 4 connected to the other end of the circuit breaker 1, a grounding device 5, and a bushing 8. . Further, the area surrounded by the two-dot chain line corresponds to each gas section of the gas insulated switchgear, and the gas section A1 including the circuit breaker 1
And a gas section A2 including the bus-side disconnectors 2 and 3, respectively.
A3 and a gas section A4 including the disconnecting switch 4, the grounding device 5, and the bushing 8 collectively.
It is classified into A4.

In this embodiment, a gas pressure sensor 10 and a gas density switch 12 are provided in the gas section A1 including the circuit breaker 1, and are connected to the gas section A1 via a common gas valve 7. ing. Circuit breaker 1
In the other gas compartments A2 to A4 that do not include the gas pressure sensor 10, only the gas pressure sensors 10 are provided, and are connected to the corresponding gas compartments A2 to A4 via the gas valve 7. As in the prior art, in the gas compartment A1 including the circuit breaker 1, the gas pressure inside the gas compartment A1 is 1 to 2 kg / cm2 in comparison with the gas pressure in the other gas compartments A2 to A4 in order to secure the shutoff performance. It is set about high.

Next, FIG. 2 is a side view (A) and a front view (B) showing a monitoring panel arranged near the gas insulated switchgear of FIG. The basic configuration of the monitoring panel shown in FIG. 2 is the same as that of the conventional example shown in FIG. That is, the monitoring panel includes an outer box 51 and a GIS control unit 52 and a monitoring unit 53 housed therein.
4 includes a sensor receiver 55, a data processing / transmission device 56,
And the like, and further provided with a dehumidifier 60 and a heat exchanger 61 in order to provide a favorable environment for these electronic devices. In addition, the monitoring unit 53 includes the rail 7
0 is provided so that it can be pulled out of the outer box 51. In the present embodiment, the monitoring unit 53 outputs L
A data display unit 59 using an ED or the like is provided.

FIG. 3 is a block diagram showing a configuration of a signal transmission system in the monitoring panel shown in FIG. 2 and a gas density switch, a gas pressure sensor, and a temperature sensor related thereto. As shown in FIG. 3, the gas compartment A of the circuit breaker 1
The alarm contact of the gas density switch 12 provided in 1 is connected to a circuit breaker control circuit (circuit breaker control unit) 72 in the GIS control unit 52 via a signal line 77. Further, the outputs of the gas pressure sensor 10 and the temperature sensor 78 attached to the gas insulated switchgear body are transmitted to a sensor receiver 55 in the monitoring unit 53, and then transmitted to a data processing / transmission device 56 for performing abnormality determination and the like. Sent. Data processing / transmission device 56
Then, temperature conversion of pressure value and abnormality determination are performed from the gas pressure sensor data and the temperature sensor data. Data processing·
The measurement data obtained by the transmission device 56 is displayed on the data display unit 5.
9 and displayed by an LED or the like.

On the other hand, if the data processing / transmission device 56 determines that the gas pressure has decreased, this data is output by a photocoupler or the like and is passed to a control system as required, and at the same time, the The abnormal data is sent to the breaker control circuit 72. The circuit breaker control circuit 72 locks the operation of the circuit breaker when the gas pressure drops by taking the logical product (AND) of the alarm contact data of the gas density switch 12 and the abnormal data on the gas pressure sensor 10 side.

The operation and effect of this embodiment having the above-described configuration are as follows. That is, among the gas density switches 12 conventionally provided in all the gas compartments A1 to A4, all the gas density switches 12 provided in the gas compartments A2 to A4 not including the circuit breaker 1 are omitted. The gas monitoring box 6 for these gas sections A2 to A4 can be omitted. Therefore, the configuration of the preventive maintenance system can be simplified as compared with the related art, which can contribute to the simplification of the configuration of the entire gas insulated switchgear, and is excellent in economic efficiency. In addition,
In this case, as shown in FIG. 9, the gas density switch 12 is conventionally used only for monitoring, and therefore, the gas density switch 12 is omitted for the gas sections A2 to A4 not including the circuit breaker 11. However, since it is possible to perform necessary and sufficient control only with the gas pressure sensor 10, there is no problem.

Further, by providing the data display section 59 in the monitoring section 53 of the on-site monitoring panel, the pressure indicator 11 in the gas monitoring box 6 of each of the gas sections A1 to A4 can be individually checked as in the prior art. Instead, the data display section 59 of the monitoring panel can easily and collectively grasp the gas pressure state of each of the gas sections A1 to A4, so that the maintenance / checkability can be improved. In addition, as shown in FIG. 8, the pressure indicator 11 provided in the gas monitoring box 6 is unnecessary, so that the gas monitoring box 6 conventionally used is completely omitted from this point. It becomes possible. Therefore, the configuration of the preventive maintenance system can be further simplified, which can further contribute to simplification of the entire gas insulated switchgear and improvement in economic efficiency. on the other hand,
When the gas pressure of the circuit breaker 1 decreases, the circuit breaker control circuit 72 can double control the operation lock of the circuit breaker 1 using the data from the gas density switch 12 and the data from the gas pressure sensor 10 as parameters. Therefore, the reliability of the control system can be improved, and as a result, the operation reliability of the circuit breaker 1 can be improved.

The present invention is not limited to the above embodiment, but can be applied to gas insulated switchgear having various device connection configurations in general, and the type of gas division can be selected as appropriate. is there. Furthermore, a specific configuration of each unit such as a detection sensor unit such as a gas pressure sensor and a gas density switch, a transmission system, and a monitoring system / control system mainly including a monitoring panel can be appropriately selected.

[0028]

As described above, in the present invention,
A gas pressure sensor and a gas density switch are provided in the gas compartment that contains the circuit breaker, and a gas pressure sensor is provided in the other gas compartments, providing a simpler and more reliable preventive maintenance system than before. In addition, it is possible to provide a gas insulated switchgear excellent in economy. In particular, since the gas density switch for the gas compartment including the circuit breaker is provided in the circuit breaker operation mechanism box, a dedicated gas monitoring box can be omitted, and the device configuration is simplified.

[Brief description of the drawings]

FIG. 1 is a single-line diagram showing equipment connections and gas compartments in one embodiment of a gas insulated switchgear for one line according to the present invention.

FIG. 2 is a side view (A) and a front view (B) showing a monitoring panel arranged near the gas insulated switchgear of FIG.

FIG. 3 is a block diagram showing a configuration of a signal transmission system in the monitoring panel shown in FIG. 2 and a gas density switch, a gas pressure sensor, and a temperature sensor related thereto.

FIG. 4 shows the potential characteristic L of the device on the vertical axis and the elapsed time t on the horizontal axis.
FIG. 4 is a model diagram showing a potential deterioration failure model when “1” is set.

FIG. 5 is a configuration diagram showing an example of a system conventionally considered as a preventive maintenance system for a gas-insulated switchgear.

6 is a side view (A) and a front view (B) showing an example of the monitoring panel shown in FIG.

FIG. 7 is a single-line diagram showing an example of a conventional gas insulated switchgear for one line connected to devices and a gas compartment.

FIG. 8 is a diagram showing a configuration of a gas monitoring box shown in FIG. 7;

9 is a block diagram showing a configuration of a signal transmission system in the monitoring panel shown in FIG. 6 and a gas monitoring box, a gas pressure sensor, and a temperature sensor related thereto.

[Explanation of symbols]

 A1 to A4 Gas section 1 Circuit breaker 2, 3 Bus-side disconnector 4 Disconnector 5 Grounding device 6 Gas monitoring box 7 Gas valve 8 Bushing 10 Gas pressure sensor 11 Pressure indicator 12 Gas Density switch 51 ... Outer case 52 ... GIS control unit 53 ... Monitoring unit 54 ... Inner case 55 ... Sensor receiver 56 ... Data processing / transmission device 59 ... Data display unit 60 ... Dehumidifier 61 ... Heat exchanger 70 ... Rail 71 ... Failure indicator 72: Circuit breaker control circuit (circuit breaker control unit) 77: Signal line 78: Temperature sensor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-106010 (JP, A) JP-A-61-231809 (JP, A) JP-A-54-67653 (JP, A) 59523 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02B 13/025-13/065 H01H 33/56 G01R 31/34 H02H 5/08

Claims (2)

(57) [Claims] 1. A gas insulated switchgear comprising a plurality of devices including a circuit breaker together with an insulating gas in a grounded metal container, wherein the plurality of devices are a single device or a plurality of devices selectively combined. A plurality of gas compartments are formed by dividing the gas as a gas compartment, and among the plurality of gas compartments, a gas compartment including the circuit breaker is provided with a gas pressure sensor and a gas density switch, and the other gas compartments are provided. A gas insulated switchgear provided with a gas pressure sensor, wherein the gas density switch is disposed in an operation mechanism box of the circuit breaker. 2. A monitoring panel for monitoring and controlling the apparatus is provided at an installation site of the apparatus, wherein the monitoring panel has gas pressure data obtained by the gas pressure sensor and gas density data obtained by the gas density switch. The gas insulated switchgear according to claim 1, further comprising: a circuit breaker control unit that locks the operation of the circuit breaker when the gas pressure decreases.