JP2002281621A - Locating apparatus for accident point - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the input of information about a protective relay, by enabling an accident point locater to locate the accident point, based on only the output signal of a pressure sensor. SOLUTION: This locator detects (13 and 14) the shock waves generated by pressure waves being reflected within a container on the occurrence of an arc, at the same time, when it detects (11 and 12) the rise of gas pressure by means of a gas pressure sensor 7 provided in each gas section. Then, this determines the gas section where the accident has occurred, from the timing of pressure rise and the occurrence of shock waves. This can locate the accident point by one gas pressure sensor, so that this eliminates the need for using information about a protective relay, and this becomes the accident point locating apparatus which is simple in structure and is easy of installation work. Moreover, to simplify the circuit constitution, the accident point determination by detection of shock waves can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accident point locating device for detecting an internal accident of a gas-insulated electrical device such as a gas-insulated switchgear (GIS).

[0002]

2. Description of the Related Art FIG. 1 is a diagram showing a configuration of a conventional accident point locating apparatus, and FIG. 2 is a table showing an accident point locating method using the apparatus shown in FIG. One pressure sensor 7 is provided for each of the plurality of gas compartments 18 of the GIS. The output signal of the pressure sensor 7 is input to the fault point locating device 19, and is input to the determination processing circuit 21 through the low-pass filter 11 and the pressure rise detection circuit 12. The judgment processing circuit 21 further receives protection relay information 22 obtained from a protection relay panel (not shown) provided separately from the accident point location device 19.

When a short circuit or ground fault occurs in the gas compartment 18, as shown in FIG. 2, an accident current flows due to the occurrence of the accident. In the gas compartment where the accident has occurred, the gas pressure is increased by the arc energy at the time of the accident. Going up. When the protection relay detects the fault current, the protection relay information 22 is output, and the fault current is cut off by the circuit breaker. When the protection relay information is output, the determination processing circuit 21 determines that the gas section in which the pressure increase is detected is the accident section.

[0004]

The gas pressure in the gas compartment also rises due to temperature rise and the like. Therefore,
In the above-mentioned conventional fault point locating device, it is not possible to determine the presence or absence of a fault only by the output signal of the pressure sensor 7, and thus requires protection relay information. For this reason, it is necessary to take out the protection relay information from the protection relay board and input it to the accident point locating device, which causes a problem that the structure and installation work of the accident point locating device become complicated.

An object of the present invention is to enable an accident point locating apparatus to locate an accident point based only on an output signal of a pressure sensor and to eliminate the need to input protection relay information.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. In the first aspect of the present invention, a gas pressure sensor provided in one gas compartment detects an increase in gas pressure, and at the same time, generates a shock wave (reflected by a pressure wave in a container when an arc is generated). Pressure shock wave). Then, the gas compartment in which the accident has occurred is determined from the timing of the pressure rise detection and the timing of the shock wave detection.

According to the present invention, since an accident point can be located only by the signal of the gas pressure sensor, there is no need to use protection relay information, and an accident point locating apparatus having a simple structure and easy installation work can be obtained. Can be. Further, when the gas compartment is a circuit breaker container that houses a circuit breaker, even when an accident occurs in a place other than the circuit breaker container, the shut-off operation causes an increase in gas pressure and a shock wave in the circuit breaker container. In this case, in the fault point locating of the present invention, an accident in the circuit breaker container and an accident other than the circuit breaker container are distinguished from the timing of the auxiliary contact of the circuit breaker, the pressure rise and the timing of the shock wave.

In the second aspect of the present invention, the gas section in which an accident has occurred is detected by detecting a shock wave generated in the container when an arc is generated by a gas pressure sensor provided in one gas section. . Unlike the rise in gas pressure, the shock wave is not generated except for the occurrence of an accident and in the case of a circuit breaker container, except for the operation of interrupting the accident current. Therefore, according to the present invention, it is possible to determine the gas compartment in which the shock wave has been detected with a simple circuit configuration. In addition,
In order to increase the reliability of the determination of the gas compartment, it is preferable to consider the increase in the gas pressure as in the first embodiment of the present invention.

When the gas compartment is a circuit breaker container accommodating a circuit breaker, an accident in the circuit breaker container and an accident other than the circuit breaker container are distinguished from the timing of the auxiliary contact of the circuit breaker and the timing of the shock wave. can do.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows a typical configuration example of a GIS to which the present invention is applied. The illustrated GIS 1 is composed of three gas compartments. The three gas compartments include a circuit breaker container 3 containing the circuit breaker 2 and containers 4 and 5 other than the circuit breaker arranged on both sides thereof. The circuit breaker container 3 houses the circuit breaker 2 and the earthing switch ES, and an accident such as a short circuit or a ground fault occurring here is defined as F2. Circuit breaker 2 has auxiliary contact 6
The state of the auxiliary contact 6 is switched by the operation of the circuit breaker 2.

Containers 4 other than the first circuit breaker container include a bus B
The US and disconnector DS are stored, and the accident that occurs here is F1
And Containers 5 other than the second circuit breaker container include a disconnector DS
And the earthing switch ES are stored.
And Accidents that occur outside GIS1 are F4.
(Embodiment 1) FIG. 4 shows a first embodiment of the accident point locating device.

The pressure sensor 7 is provided for each of the containers 3 to 5 of the GIS 1.
One is provided for each of. The figure shows an example applied to the circuit breaker container 3. An accident such as a short circuit or ground fault occurs in the container,
Alternatively, when the circuit breaker performs the breaking operation, the gas pressure in the container increases due to the arc energy. Further, a shock wave is generated by the reflection of the pressure wave in the container. The shock wave contains a high-frequency component, and the gas pressure rises more slowly than the high-frequency component of the shock wave. The pressure sensor 7
An electric signal containing a pressure rise component and a shock wave component is output.

First, the output signal of the pressure sensor 7 is input to the judgment processing circuit 9 through the low-pass filter 11 and the pressure rise detection circuit 12 in the accident point locating device 8.
Second, it is input to the judgment processing circuit 9 through the high-pass filter 13 and the shock wave detection circuit 14. Since the shock wave contains a high frequency component, the shock wave signal passes through the high-pass filter 13 and is detected by the shock wave detection circuit 14. Since the gas pressure rises relatively slowly, the pressure rise signal passes through the low-pass filter 11. The pressure rise detection circuit 12
When the pressure rise signal value exceeds a predetermined value, a signal is output. Therefore, the pressure rise detection circuit 12 outputs a signal after the shock wave detection circuit 14 outputs a signal.

The state of the auxiliary contact 6 of the circuit breaker 2 is input to the judgment processing circuit 9. When the containers are containers 4 and 5 other than the circuit breaker, the auxiliary contact 6 is omitted. Further, the determination processing circuit 9 may be provided for each pressure sensor 7 or one common to the plurality of pressure sensors 7.
The output signal of each detection circuit can be switched for use.

FIG. 5 is a chart for explaining a method for locating the accident points F1 to F4. In the figure, the location where the accident occurred (A)
When the accident F2 occurs in the circuit breaker container 3 (E),
The case where the accidents F1 and F3 occur in the containers 4 and 5 other than the circuit breaker (F) and the case where the accident F4 occurs outside the GIS 1 (G) are shown separately. When any of the faults F1 to F4 occurs, a fault current flows at the timing shown in FIG. 7C, and after a predetermined time has elapsed, the protection relay detects this and outputs protection relay information.

When the accident F2 occurs in the circuit breaker container 3 (E), the gas pressure starts increasing simultaneously with the occurrence of the accident in the circuit breaker container 3, and a shock wave is generated. Thereby, the shock wave detection circuit 14 outputs a signal first. When the circuit breaker 2 performs the breaking operation by the output of the protection relay information, the fault current is broken, and the state of the breaker auxiliary contact 6 is switched. The pressure rise detection circuit 12 outputs a signal when the gas pressure rise signal exceeds a threshold value, but this timing is later than the shock wave detection. The judgment processing circuit 9 detects a shock wave in the circuit breaker container 3 before the switching operation of the auxiliary contact 6,
Further, when the gas pressure rise is detected after the shock wave is detected, it is determined that the accident F2 has occurred in the circuit breaker container 3 (D).

In the case of an accident inside the circuit breaker container, no increase in the gas pressure is detected and no shock wave is detected in the containers 4 and 5 other than the circuit breaker, so that it is determined that an accident has occurred in those containers. Never. Containers 4 other than the circuit breaker container 3,
If an accident occurs in 5 (F), in the container 4 or 5, the shock wave detection circuit 14 first outputs a signal, and then the pressure rise detection circuit 12 outputs a signal. The determination processing circuit 9 determines that an accident has occurred in the container when the gas pressure rise is detected after detecting the shock wave in the container 4 or 5 (D). In the containers 4 and 5 other than the circuit breaker, since no pressure rise or shock wave is generated except in the case where an accident occurs in the own container, it can be determined that the accident F1 or F3 has occurred in the container only based on the above conditions. .

When the accidents F1 and F3 occur in containers other than the circuit breaker (F), the circuit breaker 2 starts the interruption operation by outputting the protection relay information to interrupt the accident current. For this reason, in the circuit breaker container 3, even though the accident F <b> 2 has not occurred, a pressure rise and a shock wave are generated by the arc generated at the time of the breaking operation, and the pressure rise detection circuit 12.
And the shock wave detection circuit 14 outputs a signal, and the state of the auxiliary contact 6 is switched. However, in this case, the occurrence of a shock wave and an increase in gas pressure are detected after the switching operation of the auxiliary contact 6.
It is determined that the accident F2 has not occurred in the inside.

When an accident F4 occurs outside the GIS 1 (G), the circuit breaker 2 performs a breaking operation in the circuit breaker container 3, so that the pressure rise detecting circuit 12 and the shock wave detecting circuit 1
4 outputs a signal, but detects a shock wave and a rise in gas pressure after the switching operation of the auxiliary contact 6. In the containers 4 and 5 other than the circuit breaker, neither a pressure rise nor a shock wave is detected. In such a state, the determination processing circuit 9 does not determine that the accident F4 has occurred in the GIS 1 (D). Or GI
It is not determined that an accident has occurred in S1.

According to this embodiment, an accident point can be located based only on the output signal of the pressure sensor. Further, in this example, since the presence or absence of an accident is determined based on both the pressure rise and the generation of a shock wave, it is possible to prevent erroneous detection, that is, determination that an accident has occurred even though no accident has occurred. FIG. 6 shows another configuration example of the accident point locating device.

In this embodiment, signal transmission between the auxiliary contact 6 and the pressure sensor 7 and the accident point locating device 8 is performed using the optical fiber 15. For this purpose, an electric signal output from the auxiliary contact 6 and the pressure sensor 7 is converted into an optical signal by an E / O (electric / optical converter) 16 and transmitted to the fault point locating device 8 via an optical fiber 15. The accident point locator 8 converts the optical signal to O /
The signal is converted into an electric signal by an E circuit (optical / electrical converter) 17. The processing operation of the accident point locating device 8 is the same as the above-described examples of FIGS.

According to this embodiment, since the signal transmission between the GIS 1 and the fault point locating device 8 is performed using the optical fiber, the fault point locating device 8 can be insulated from the high voltage portion.
Further, it is possible to prevent noise from entering from outside during signal transmission. (Embodiment 2) FIG. 7 shows a second embodiment of the accident point locating device. In this example, the circuit configuration is simplified compared to the first embodiment, and the price of the device is reduced.

The circuit shown in FIG. 7 is obtained by omitting the low-pass filter 11 and the pressure rise detecting circuit 12 from the circuit shown in FIG. Therefore, refer to the description of FIG. 4 for the circuit configuration of FIG. FIG. 8 shows the accident point F
It is a chart explaining the method of locating 1-F4. The configuration of the chart of FIG. 8 is the same as the chart of FIG. 5 described above. The case where the accidents F1 and F3 occur (F) and the case where the accident F4 occurs outside the GIS 1 (G) are shown separately.

When any of the faults F1 to F4 occurs, a fault current flows at the timing shown in FIG. 3C, and after a predetermined time has elapsed, the protection relay detects this and outputs protection relay information. When the accident F2 occurs in the circuit breaker container 3 (E), a shock wave is generated in the circuit breaker container 3 simultaneously with the occurrence of the accident. As a result, the shock wave detection circuit 14
Outputs a signal. When the circuit breaker 2 performs the breaking operation by the output of the protection relay information, the fault current is broken, and the state of the breaker auxiliary contact 6 is switched. When the shock wave is detected in the circuit breaker container 3 before the switching operation of the auxiliary contact 6, the determination processing circuit 9 determines that the accident F2 has occurred in the circuit breaker container 3 (D).

In the case of an accident inside the circuit breaker container, since shock waves are not detected in the containers 4 and 5 other than the circuit breaker container, it is not determined that an accident has occurred in those containers. When an accident occurs in the containers 4 and 5 other than the circuit breaker container 3 (F), the shock wave detection circuit 14 outputs a signal in the containers 4 or 5. In the containers 4 and 5 other than the circuit breaker, a shock wave is not generated except when an accident occurs in its own container.
Alternatively, it can be determined that F3 has occurred.

When the accidents F1 and F3 occur in containers other than the circuit breaker (F), the circuit breaker 2 starts the interruption operation based on the output of the protection relay information to interrupt the accident current. For this reason, in the circuit breaker container 3, a shock wave is generated by the arc generated at the time of the breaking operation even though the accident F2 does not occur, and the shock wave detection circuit 14 outputs a signal,
In addition, the state of the auxiliary contact 6 is switched. However, in this case, the occurrence of a shock wave is detected after the switching operation of the auxiliary contact 6, so that the judgment processing circuit 9 determines
It is determined that the accident F2 has not occurred in the inside.

When an accident F4 occurs outside the GIS 1 (G), the breaker 2 performs a breaking operation in the breaker container 3, so that the shock wave detection circuit 14 outputs a signal.
After the switching operation of the auxiliary contact 6, a shock wave is detected. In the containers 4 and 5 other than the circuit breaker, no shock wave is detected. In such a state, the determination processing circuit 9 does not determine that the accident F4 has occurred in the GIS 1 (D).

According to this embodiment, the circuit configuration can be further simplified as compared with the first embodiment, and the cost of the device can be reduced. FIG. 9 shows another configuration example of the accident point locating device. In this example, the signal transmission between the auxiliary contact 6 and the pressure sensor 7 and the accident point locating device 8 is performed using the optical fiber 15, as in the configuration of FIG. The circuit shown in FIG. 9 is obtained by omitting the low-pass filter 11 and the pressure rise detection circuit 12 from the circuit shown in FIG. Therefore, refer to the description of FIG. 6 for the circuit configuration of FIG. 9 and the operation thereof.

[0029]

According to the present invention, in the fault point locating device, the fault point can be located based only on the output signal of the pressure sensor, and the input of the protection relay information can be made unnecessary.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a conventional accident point location device.

FIG. 2 is a chart showing an accident point locating method using the apparatus of FIG. 1;

FIG. 3 is a diagram showing a configuration of a GIS to which the present invention is applied.

FIG. 4 is a diagram showing a first embodiment of an accident point locating device according to the present invention.

FIG. 5 is a chart showing an accident point locating method using the apparatus of FIG. 4;

FIG. 6 is a diagram showing a configuration of another embodiment of the accident point locating device of FIG. 4;

FIG. 7 is a view showing a second embodiment of the accident point locating device according to the present invention.

FIG. 8 is a chart showing an accident point locating method using the apparatus of FIG. 7;

FIG. 9 is a diagram showing a configuration of another embodiment of the accident point locating device of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... GIS 2 ... Circuit breaker 3 ... Circuit breaker container 4, 5 ... Container other than a circuit breaker 6 ... Auxiliary contact 7 ... Pressure sensor 8 ... Accident point locating device 9 ... Judgment processing circuit 11 ... Low pass filter 12 ... Pressure rise detection circuit DESCRIPTION OF SYMBOLS 13 ... High pass filter 14 ... Shock wave detection circuit 15 ... Optical fiber 16 ... E / O (electric / optical converter) 17 ... O / E circuit (optical / electric converter) 18 ... Gas section 19 ... Fault point locating device 21 ... Judgment processing circuit 22 ... Protection relay information

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02H 5/00 H02B 13/06 N (72) Inventor Yasuo Takeuchi 3-3 Nakanoshima, Kita-ku, Osaka-shi, Osaka No. 22 Kansai Electric Power Co., Inc. F term in reference (reference) 2G033 AB01 AC02 AC04 AD18 AD30 AG13 5G017 BB01 DD14 EE01 5G028 GG18 GG21

Claims (4)

[Claims] An accident point locating device for locating an accident point of a gas insulated electric device having a plurality of gas sections, wherein an increase in gas pressure is detected from an output of a pressure sensor provided in one gas section. A gas pressure rise detecting section, a shock wave detecting section for detecting a shock wave from the output of the pressure sensor, and a gas section in which an accident has occurred based on the timing of the gas pressure rise and the timing of the shock wave detected by each of the detecting sections. And a judgment processing unit for judging the fault condition. 2. When the one gas compartment is a circuit breaker container, the determination processing unit detects switching of an auxiliary contact of the circuit breaker, and determines a timing of switching of the auxiliary contact and a gas pressure rise. The gas compartment in which the accident occurred is determined from the timing of the shock wave generation and the timing of the shock wave generation.
An accident point locating device for a gas-insulated electrical device according to item 1. 3. An accident point locating device for locating an accident point of a gas insulated electric device having a plurality of gas compartments, wherein a shock wave is detected from an output of a pressure sensor provided in one gas compartment. An accident point locating device for gas-insulated electrical equipment, comprising: a detection unit; and a determination processing unit that determines a gas section in which an accident has occurred from a shock wave detected by each of the detection units. 4. When the one gas compartment is a circuit breaker container, the determination processing unit detects switching of an auxiliary contact of the circuit breaker, and switches timing of the auxiliary contact and timing of shock wave generation. 4. The fault point locating apparatus for gas-insulated electrical equipment according to claim 3, wherein the gas section in which the fault has occurred is determined from the following.