JPH07218575A - Fault location system - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a highly reliable fault point locating system that enables self-diagnosis of the fault point locating system itself. [Configuration] In a plurality of gas compartments 20 of the gas insulated switchgear,
A plurality of gas pressure sensors 21 each for measuring the internal gas pressure and outputting a measurement signal are arranged. The gas pressure sensor includes a converter 2 that processes a measurement signal and outputs a detection signal.
2, a sensor receiver 23 that calculates a detection signal as gas pressure measurement data, and a data processing device 24 that processes the measurement data. The data processing device 24 compares the obtained measurement data with the measurement data obtained by another gas pressure sensor in the same gas section, and compares the obtained measurement data with the gas pressure abnormality determination management value. A data comparison unit 26 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault point locating system for locating a fault point of a flashover accident occurring inside a gas insulated switchgear.

[0002]

2. Description of the Related Art In recent years, due to the need to strengthen substation equipment accompanying the soaring land and the increase in power supply in urban areas, SF ₆ gas, which has excellent insulation and arc extinguishing properties, has been used to disconnect switches, Store and arrange transformer equipment such as circuit breakers in a closed container,
So-called gas-insulated switchgear, which has reduced environmental resistance and installation volume per KV / A, has become widespread and in operation.

The gas-insulated switchgear as described above has various advantages such as compactness and reduction of the exposed charging portion of the ground tank, but on the other hand, maintenance diagnosis is difficult and maintenance / repair work time is increased due to higher performance. When an abnormality occurs inside the container, the reliability of the container is significantly reduced.
Therefore, in order to improve the reliability of the entire gas-insulated switchgear, we have been striving to properly design and manufacture the device, but as a part of improving the quality of the power supply capability, the reliability of the entire device has been improved. Confirmation and monitoring are required, and various effective means have been studied.

Here, such a gas-insulated switchgear will be specifically described with reference to FIG. In this case, FIG. 3 is a layout diagram showing an example of a general gas-insulated switchgear. That is, the closed pressure vessel 1 is set to the ground potential,
In this closed pressure vessel 1, a lightning arrester 2,
The transformer 3, the earthing switch 4, the disconnector 5, the current transformer 6, the circuit breaker 7, and the busbar 8 are arranged, and the hermetic pressure vessel 1 and the voltage applying section, which are at the ground potential, are the hermetic pressure vessel. It is insulated by an insulating gas 9 such as SF ₆ gas sealed in the inside 1.

Insulating spacers 10a to 10d are arranged in the closed pressure vessel 1 at appropriate intervals to support the busbar 8 so that the mechanical strength and dielectric strength of the busbar 8 can be maintained. It is configured. This insulating spacer 10
The a to 10d are arranged so as to airtightly divide the space inside the closed pressure vessel 1 due to the necessity of separation for maintenance and arrangement, and thereby the insulating gas 9 is enclosed and divided. It is configured such that gas is filled in each divided area. Further, reference numeral 11 in the drawing denotes a gas cylinder, and the gas cylinder 11 is configured to be filled with gas through the gas cubicle 12 and the valve 13 into each divided area in the sealed pressure container 1. Gas cubicle 12
Also has a function as a gas pressure sensor that detects the pressure of each divided area (hereinafter, gas division).

Further, in FIG. 3, the main circuit is connected to the transformer 19 via the bushing 14, the disconnector 5 and the circuit breaker 7. Although FIG. 3 shows the one-line power receiving main circuit, power is supplied from the power receiving main circuit (not shown) on the right side of the power receiving main circuit to the transformer 19 via the circuit breaker 7. In some cases. On the other hand, reference numeral 15 in the figure denotes a switchboard, which gives an urging signal to an operating device 17 of switches (disconnector 5, circuit breaker 7, grounding switch 4) via an operating cubicle 16 to supply a main circuit of the switches. It has the function of controlling switching and shut-off operations. Further, reference numeral 18 in the drawing denotes a compressor equipment 18 which serves as a drive source for the switches, and a predetermined pressure (for example, 15 Kg / cm ² is general) obtained by the compressor equipment 18 is passed through the operation cubicle 16. It is configured to be supplied to the operating device 17 to operate the switches.

The gas-insulated switchgear having the above structure has the following advantages. That is, due to the excellent characteristics of the insulating gas, the storage device can be downsized, and the entire device can be downsized. That is, the occupied volume per KV · A becomes small, and the effective use of the installation site becomes possible. Further, it is possible to stack two or three stages by using a gas busbar, and block stacking can be performed, so that there is an advantage that a large volume structure can be obtained with a small area. Further, since the closed pressure vessel 1 is grounded, there is no risk of electric shock even when approaching during electricity application, and since the electricity application part is not directly exposed to salt damage, wind and rain, deterioration due to external factors There is no fear. Further, since various switches are subjected to arc treatment in SF ₆ gas having a high extinguishing ability, the breaking capacity per main contact can be greatly improved.

The gas-insulated switchgear shown in FIG. 3 has the above-mentioned advantages, but has the following drawbacks. In other words, as a result of making the entire gas-insulated switchgear compact, the size of rotation work or reassembly work is limited to a small size during maintenance / inspection of storage equipment, which requires a long time for maintenance / inspection work of storage equipment. , Work efficiency was significantly reduced.

Further, the SF enclosed in the closed pressure vessel
_Since the insulating gas such as ₆ gas is expensive, the manufacturing technology for preventing gas leakage to the outside is high-grade, and because of good insulation, KV / mm is large, and the gas pressure drop is extremely sensitive to the insulation margin. Because of this, a complete emergency repair system for gas leaks was required. Further, since the closed pressure vessel is used, there is a drawback that the stored equipment cannot be visually observed. Also, in replacement work due to exhaustion of the main contacts of various switchgear, it takes a lot of time to recover and refill the insulating gas, so the gas-insulated switchgear will be stopped for a long time, hindering stable power supply. It also had the drawback of causing

As described above, the gas-insulated switchgear shown in FIG. 3 has not only advantages but also some drawbacks, but the performance advantage is sufficient even if the drawbacks are compensated. It's so popular that it's remarkably popular. However, recently, the number of installation locations for gas-insulated switchgear has increased,
As a result of the mass production system being adopted, the maintenance and preparation of an emergency repair system and the variation in quality have become issues that cannot be ignored.

As a countermeasure against such a problem in the gas-insulated switchgear, it has been earnestly desired to establish a preventive maintenance system capable of confirming the reliability that the operating condition is normal and enabling early detection diagnosis when an abnormality occurs. There is. That is, by introducing such a preventive maintenance system, accidents of the gas insulated switchgear can be prevented and stable power supply can be achieved.
It is expected to minimize the economic loss caused by the accident.

Conventionally, in the preventive maintenance system as described above, by promptly detecting the failure point, the accident response can be expedited, which contributes to the quick recovery, and the substation can be efficiently applied in the event of an accident. For the purpose of minimizing the spread range of the gas pressure sensor, a gas pressure sensor was used to detect a gas pressure increase due to the internal arc energy at the time of an accident, thereby locating a failure point.

As an example for locating such a fault point, a fault point locating system having a configuration as shown in FIG. 4 has been conventionally proposed. This fault location system is
This is a system for locating a failure point using a gas pressure sensor. That is, in the gas-insulated switchgear, a gas pressure sensor 21 that measures a gas pressure inside each gas section 20 and outputs a gas pressure signal is provided in each gas section 20 in the sealed pressure vessel 1. . This gas pressure sensor 2
An insulation converter 22 that processes a gas pressure signal from the gas pressure sensor 21 and outputs a detection signal is connected to the device 1. The insulation converter 22 is connected to a receiver 23 that converts a detection signal from the insulation converter 22 into gas pressure measurement data. A data processing device 24 that processes gas pressure measurement data in the receiver 23 is connected to the receiver 23. The data processing device 24 also serves as a data transmission device, and a control room (not shown) is provided through an optical cable.
It is configured to be transmitted to a failure point information processing board (not shown) installed in, for example. The failure point information processing board (not shown) is configured to perform failure point locating processing in combination with the protection relay information, and display / output the result.

With the fault point locating system having such a configuration, the accident point in the gas section can be detected as follows. That is, first, the quasi-steady-state gas pressure increase value ΔP due to the arc generated in the tank at the time of the accident is
As studied in EWG etc., the following formula (1)
Can be almost evaluated.

[Formula 1] ΔP = (C · I · t) / V (1) where ΔP: pressure rise value (kgf / cm ² ) C: coefficient (0.2 to 0.35) I: Arc current (kA) t: Arc continuation time (ms) V: Container volume (l) By detecting such a pressure increase value ΔP with a pressure sensor, the faulty part can be located.

[0015]

However, the above-mentioned failure point locating system has a drawback in that it cannot self-diagnose the abnormality of the gas pressure sensor itself and the abnormality of the entire system for converting pressure measurement data. That is, whether a flashover accident has occurred due to the detection of the pressure rise of one gas pressure sensor, or the system system including the gas pressure sensor (the pressure measurement that inputs the gas pressure sensor and the gas pressure signal from the gas pressure sensor) It was impossible to judge whether an abnormality occurred in the data conversion system. In such a situation, it is difficult to prevent an accident in the gas-insulated switchgear, which makes it impossible to supply electric power in a stable manner and causes a large economic loss.

Therefore, in the fault point locating system, the gas pressure value is constantly measured in a normal state, and the gas pressure increase value is monitored, so that no abnormality has occurred in the system system including the gas pressure sensor. Or, it is necessary to always self-diagnose. However, at present, no fault point locating system provided with such a self-diagnosis function is provided.

The present invention has been proposed to solve the above-mentioned drawbacks, and an object thereof is to provide a highly reliable fault point locating system which enables self-diagnosis of the fault point locating system itself. It is to be.

[0018]

In the fault point locating system according to the present invention, a gas-insulated switchgear in which a high-voltage conductor is housed in a grounded metal container filled with an insulating gas is divided into a plurality of gas compartments. A detection sensor that measures an internal state of a corresponding gas section and outputs a measurement signal is arranged in the gas compartment, and a failure point locating system that locates a failure point based on the measurement signal from the detection sensor is used. Is provided in each of the gas sections, and a converter for processing the measurement signal from the detection sensor and outputting the detection signal to the detection sensor, and a detection signal from the converter is calculated as measurement data. And a data processing device for processing the measurement data obtained by the receiver. The data processing device is provided in the same gas section as the obtained measurement data. Together and compares the obtained measured data by the detection sensor, the data comparison unit for comparing the obtained measurement data and the data for determining abnormality management value is characterized by being provided.

It is also possible to configure the detection sensor, the converter, and the receiver as one unit, and to provide a plurality of this unit for one gas section.

Further, a gas pressure sensor can be provided as the detection sensor. Furthermore, the system system consisting of the detection sensor and the converter / receiver / data processor is
The gas insulated switchgear can be installed in units of a fixed number of lines.

[0021]

The operation of the present invention having the above construction is as follows. That is, the measurement signals are respectively output from the plurality of detection sensors in the same gas section. This measurement signal is processed by a system including a converter and a receiver, and is input to the data processing device as a measurement data signal. The measurement data signals of a plurality of detection sensors provided in the same gas section are input to the data processing device. Then, the data processing device compares these measurement data.
At this time, if a difference of a certain level or more occurs between the processed data, the pressure measurement data conversion system system including the detection sensor and the converter / receiver for each gas pressure sensor and the data input section is connected. It can be judged that an abnormality has occurred. Further, the failure point can be located by comparing the measurement data and the data abnormality determination management value. Therefore, the fault point locating system has a self-diagnosis function of the system including the detection sensor.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fault point locating system according to the present invention will be specifically described below with reference to the drawings. Note that FIG.
2 is a block diagram showing the fault point locating system of the present embodiment, and FIG. 2 is a flow chart showing the outline of the operation in the data processing device of the fault point locating system of FIG. Here, members having the same functions as those of the conventional technique will be described with the same reference numerals.

That is, in the fault point locating system of this embodiment, as shown in FIG. 1, each gas section 20 provided in the sealed pressure vessel 1 of the gas insulated switchgear has a gas as a detection sensor. A plurality of gas pressure sensors 21 that measure the gas pressure inside the section 20 and output a gas pressure signal are provided. The gas pressure sensor 21 is connected to an insulation converter 22 which processes a gas pressure measurement signal from the gas pressure sensor 21 and outputs a detection signal. The insulation converter 22 is connected to a receiver 23 that converts a detection signal from the insulation converter 22 into a gas pressure measurement data signal.

The receiver 23 includes a data processing device 24.
Are connected. A data input unit 2 for inputting a measurement data signal from the receiver 23 to the data processing device 24.
5 is provided with a data comparison unit 26 that compares measurement data of the same gas section and a management value for gas pressure abnormality determination.

In the present embodiment having such a configuration, as shown in FIG.
When a gas pressure measurement data signal is input to the data processing device 24 as shown in FIG. 5, the fault location is determined and the occurrence of an abnormality in the system system including the gas pressure sensor is determined as described below. .

That is, in the data processing device 24, first, the measurement data signal from the receiver 23 is sent to the data input unit 2
5 is input (step 1). Next, the data comparison unit 2
In 6, the gas pressure measurement data from the data input unit 25 is compared with the gas pressure measurement data obtained from the plurality of gas pressure sensors 21 arranged in the same gas compartment. Then, it is confirmed that the compared data do not differ by more than a certain level (step 2). At this time, in the case of "NO" where there is a difference of a certain level or more, it is determined that an abnormality has occurred in the corresponding gas pressure sensor 21 or the entire pressure measurement data conversion system system. In this case, system abnormality processing is performed (step 3).

On the other hand, in step 2, the gas pressure measurement data are compared, and the difference is below a certain level, "Y.
In the case of “ES”, the system system including the gas pressure sensor is judged to be in a normal state. In this case, the data comparison unit 26 further compares the gas pressure abnormality determination management value with the measurement data of the gas pressure to confirm that the gas pressure is normal and normal (step 4). At this time, if it is determined to be "NO" that the gas pressure becomes abnormal, the fault point is located (step 5). On the other hand, when it is determined in step 4 that there is no abnormality in the gas pressure, that is, "YES", the process returns to step 1 and it is continuously determined whether or not an abnormality has occurred in the system system including the gas pressure sensor. , And the fault location are repeated.

As described above, according to this embodiment, since the data processing unit 24 is provided with the data input unit 25 and the data comparison unit 26, from the gas pressure measurement data obtained by the gas pressure sensor 21, Two types of data comparison can be done. This is a comparison of the measurement data of the same gas section and a comparison of the gas pressure control value and the measurement data. As a result, in this embodiment, both the detection of the occurrence of an abnormality in the system including the gas pressure sensor 21 and the localization of the failure point can be performed with a simple configuration. Therefore, in this embodiment, it is possible to obtain a highly reliable failure point locating system having a self-diagnosis function for the entire gas pressure sensor and pressure measurement data conversion system system.

The level set value for judging the system abnormality and the gas pressure control value for judging the abnormality in this embodiment vary depending on the environment in which each gas insulated switchgear is installed. It can be adjusted and changed at the installation site. Further, the present invention is not limited to the above-described embodiments, and the specific configuration of each part can be changed as appropriate. For example, the specific configurations of the gas pressure sensor, the insulation converter, the receiver and the data processing device can be freely changed. Further, the detection sensor is not limited to the gas pressure sensor, and may be another detection sensor such as a temperature sensor. In this case, the receiver is configured to calculate the gas pressure value as the measurement data from the temperature. Thus, not only the gas pressure value abnormality but also the temperature abnormality can be detected at the same time.

Further, according to the present invention, a unit consisting of a detection sensor, an insulation converter, and a receiver is formed, and a plurality of units are arranged for each gas section, and these units are combined into one data processing device. It can also be configured to be connected. When an abnormality occurs in the system system including the gas pressure sensor by such a unit, the abnormality can be processed in a short time by replacing the unit portion.

Further, in the present invention, the system including the detection sensor, the converter, the receiver, and the data processing device is not limited to one line unit of the gas insulated switchgear, and may be installed in a fixed number of line units. You can

[0032]

As described above, according to the present invention,
By comparing the output from multiple gas pressure sensors attached to the same gas compartment with a single data processing device, it is possible to identify the failure point and perform self-diagnosis of the system system including the gas pressure sensor. It is possible to provide a fault location system that is highly reliable.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a fault point locating system according to the present invention.

FIG. 2 is a flowchart showing an outline of an operation in the data processing device of the fault point system of FIG.

FIG. 3 is a layout diagram showing an example of a general gas-insulated switchgear.

FIG. 4 is a block diagram showing a configuration of a conventional fault point locating system.

[Explanation of symbols]

 1 ... Closed pressure container 2 ... Lightning arrester 3 ... Transformer 4 ... Grounding switch 5 ... Disconnector 6 ... Current transformer 7 ... Circuit breaker 8 ... Busbar 9 ... Insulating gas 10a-10d ... Insulating spacer 11 ... Gas cylinder 12 ... Gas cubicle 13 ... Valve 14 ... Bushing 15 ... Switchboard 16 ... Operation cubicle 17 ... Operator 18 ... Compressor equipment 19 ... Transformer 21 ... Gas pressure sensor 22 ... Insulation converter 23 ... Receiver 24 ... Data processing device 25 ... Data input unit 26 … Comparison section

Claims (4)

[Claims] 1. A gas-insulated switchgear in which a high-voltage conductor is housed in a grounded metal container filled with insulating gas is divided into a plurality of gas compartments, and each gas compartment measures the internal state of the corresponding gas compartment. Then, a detection sensor for outputting a measurement signal is arranged, and in a fault point locating system for locating a fault point based on the measurement signal from the detection sensor, the detection sensor is provided in plural in each gas section, respectively, The detection sensor includes a converter that processes a measurement signal from the detection sensor and outputs a detection signal, a receiver that calculates the detection signal from the converter as measurement data, and a measurement obtained by the receiver. A data processing device for processing data is provided, and the data processing device compares the obtained measurement data with the measurement data obtained by another detection sensor in the same gas compartment. At the same time, a failure point locating system is provided, which is provided with a data comparison unit that compares the obtained measurement data with a data abnormality determination management value. 2. The detection sensor, the converter, and the receiver are one unit.
The fault point locating system according to claim 1, wherein the fault point locating system is configured as one unit, and a plurality of the units are provided for one gas section. 3. The failure point locating system according to claim 1, wherein a gas pressure sensor for detecting the pressure inside the gas compartment is provided as the detection sensor. 4. The system according to claim 1, wherein the detection sensor and a system system including a converter, a receiver, and a data processing device are installed in units of a certain number of lines of a gas insulated switchgear. Fault location system.