JPH06289090A - Fault location system - Google Patents

Abstract

PURPOSE:To contribute to the quick recovery of a transmission system at the time of a fault by making it possible to monitor a plurality of gas sections efficiently as a whole, and also greatly improving the fault location capability. CONSTITUTION:A fault-point detecting means 7 is individually provided at each of a plurality of gas sections A-L. The gas sections A-F and G-L under the same pressure are connected with a gas pipe 3 for overall monitoring in parallel. A plurality of the gas sections A-L are connected to the gas pipe 3 for overall monitoring with individual gas pipe 4. The fault-point detecting means 7 are arranged at the parts of the individual gas pipes 4. Pressure- propagation suppressing means 8, which suppress the propagation of the gas pressure, are provided at positions close to the gas pipe 3 for overall monitoring from the providing positions of the fault-point detecting means 7 for the individual gas pipes 4. Or the output signals outputted from a plurality of the fault- point detecting means are received as a whole with a means for discriminating the arriving sequence of the output signals. Thus, the arriving sequence of the signals is discriminated.

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 gas insulation device caused by a ground fault or the like, and in particular, a fault point in a gas section unit divided by an insulating spacer. The present invention relates to a fault point locating system for locating.

[0002]

2. Description of the Related Art In recent years, the price of land is rising and the amount of electric power supplied in urban areas is increasing, and the need for strengthening substation facilities is increasing. Therefore, SF with excellent insulation and arc extinguishing properties
_The so-called gas-insulated switchgear, which uses ₆ gases to house disconnecting switches, circuit breakers, and other substation equipment in a sealed container to make the environment-resistant and installation volume per KV / A compact, has become widespread and in operation. ing.

A conventional example of the gas-insulated switchgear will now be described with reference to FIG. FIG. 6 is a gas system diagram showing an example of a general gas insulated switchgear. In this FIG.
The sealed pressure vessel 21 is set to the ground potential, and a lightning arrester 22, a transformer 23, a grounding switch 24, a disconnector 25, a current transformer 26, a circuit breaker 27 are provided in the sealed pressure vessel 21 as a voltage applying section.
, And the busbar 28 are disposed, and the sealed pressure vessel 21 set to the ground potential and the charging section are electrically insulated by the insulating gas 29 such as SF ₆ gas sealed in the sealed pressure vessel 21. ing. Further, in the sealed pressure vessel 21,
Insulating spacers 30a to 30d for supporting the bus bar 28
Are arranged at appropriate intervals, and are configured so that the mechanical strength and dielectric strength of the bus bar 28 can be maintained.

In this case, the insulating spacers 30a to 30d
Are arranged so as to airtightly divide the space inside the sealed pressure vessel 21 due to separation for maintenance and necessity of arrangement. That is, the hermetically sealed pressure vessel 21 has the insulating spacer
It is divided into a plurality of gas compartments by a to 30d.
As a result, the insulating gas 29 in the sealed pressure vessel 21 is sealed and the gas is individually sealed in each gas compartment.

Further, reference numeral 31 in the drawing denotes a gas cylinder, and from this gas cylinder 31, a gas cubicle 32 and a valve 3 are provided.
The gas compartments in the sealed pressure vessel 31 are filled with the gas via the gas generator 3. The gas cubicle 32 also has a function as a gas pressure sensor that detects the pressure of each gas compartment.

Further, in FIG. 6, the main circuit is connected to the transformer 39 via the bushing 34, the disconnector 25 and the circuit breaker 27. Although FIG. 6 shows a single-line power receiving main circuit, a power receiving main circuit (not shown) adjacent to the power receiving main circuit is connected via a disconnector 25.
Electric power may be supplied to the transformer 39. On the other hand, 3 in the figure
Reference numeral 5 denotes a switchboard, which gives an activating signal to an operator 37 of switches (disconnector 25, circuit breaker 27, earthing switch 24) via an operation cubicle 36 to switch the main circuits of the switches and perform a disconnection operation. It has a function to control. Also, 38 in the figure
Is a compressor equipment that is a drive source of the switches, and a predetermined pressure (for example, 15 kg / cm ² is generally obtained) obtained by the compressor equipment 38 is supplied to the operator 37 via the operation cubicle 36. The switches are configured to be operated.

The gas-insulated switchgear having the above-mentioned structure has various advantages such as compactness and reduction of the exposed charging part of the ground tank, but on the other hand, maintenance diagnosis is difficult and maintenance / repair work is required due to high performance. When an abnormality occurs inside the container such as an increase in time, there is a problem that the reliability thereof is significantly reduced. For example, regarding the difficulty of maintenance diagnosis,
The charging part is housed in a metal tank and is instantly removed by a circuit breaker even when an accident such as a ground fault occurs, so even if an abnormality occurs inside the container, despite internal damage,
It is difficult to identify the ground fault occurrence point from the outside of the container.

Therefore, in order to improve the reliability of the entire gas-insulated switchgear, proper design and manufacture of the device are being promoted. It is earnestly desired to establish a preventive maintenance system capable of confirming the reliability that the condition is normal and enabling early detection and monitoring when an abnormality occurs. Especially in recent years, the number of installation locations of gas insulated switchgear has increased and mass production system has been adopted, so preparation for maintenance and emergency repair system and quality variation are problems that cannot be ignored.Establishment of preventive maintenance system Is urgently needed.

As the preventive maintenance system as described above, various abnormality detection systems for identifying the accident occurrence point have been proposed in the past, and some of them have already been put into practical use. One of these anomaly detection systems is a failure point locating system that detects a pressure rise and locates a failure point, and the number of practical examples is increasing because of its high reliability. The fault point locating system is equipped with a fault point detector that detects a gas pressure rise due to internal arc energy when an accident occurs in a gas-insulated device, and the fault point detector detects the fault point to detect the accident point. Is a system for identifying. According to such a fault point locating system, by promptly detecting the fault point, it is possible to speed up the response to the accident and contribute to the early restoration of the power transmission system.

Further, in recent years, it has been required to enable the following operations in order to efficiently operate a substation when an accident occurs by introducing a fault point locating system. That is, when an accident occurs in a gas-insulated device, a configuration is required that allows the failure point locating system to identify the point of the accident at a distant place and to remotely restore the power transmission system by utilizing a healthy line. ing.
It can be said that such an operation is extremely important for the efficient operation of the substation and the early restoration of the power transmission system in the event of an accident, as the substation becomes unmanned.

The operation of utilizing the above-mentioned sound line will be specifically described with reference to the conventional system operation example shown in FIG.
In FIG. 7, line lines A-1L, B-1L, A
-2L, B-2L via respective disconnector DS ₁ to DS _8, are connected in parallel between the first main bus and the second main bus. Then, the disconnectors DS ₁ and DS ₃ are closed to connect the line lines A-1L and B-1L to the first main bus, and the disconnectors DS ₆ and DS ₈ are closed to form the line line A.
-2L and B-2L are connected to the second main bus for system operation.

If it is assumed that a ground fault accident occurs at point P, the first main bus will temporarily stop, but if it can be specified that the ground fault accident occurrence point is point P, then the first main bus It turns out that no accident has occurred in the line circuit B-1L connected to the busbar. Therefore, it is possible to switch to the second main bus by remotely opening the disconnectors DS ₁ and DS ₃ and closing the disconnectors DS ₂ and DS ₄ . In this way, normally, the line line B-1L can be utilized within about 1 minute.

On the other hand, an impact gas pressure sensor as shown in FIG. 8 is used as a failure point detector for detecting the impact gas pressure generated at the time of a ground fault. That is, 41 in the figure
Is a gas-insulated switchgear in which a high-voltage charging part is built in a sealed pressure container. The gas-insulated switchgear 41 and the switch case 42 of the impact gas pressure sensor are connected via the gas pipe 43. ing. A gas chamber 47 is formed inside the switch case 42. A gas introduction hole 44 is formed at the bottom of the switch case 42 and is connected to the gas pipe 43.

A cylinder 45 is vertically installed inside the bottom surface of the switch case 42. The lower opening of the cylinder 45 communicates with the gas introduction hole 44. An end plate 48 is fixed to the upper portion of the cylinder 45. End plate 4
A through hole 49 is opened in 8 and the through hole 49 and the upper opening of the cylinder 45 communicate with each other. A detection switch 46 such as a micro switch is fixed to the end plate 48. The detection switch 46 is connected to a detection circuit (not shown) that displays a failure. A float 50 is vertically movably attached to the hollow portion of the cylinder 45. A protrusion 51 for pressing the detection switch 46 is provided above the float 50.

The operation of the shock gas pressure sensor constructed as described above is as follows. That is, during the steady operation of the gas insulated switchgear 41, the insulating gas from the gas insulated switchgear 41 enters the gas chamber 47 of the switch case 42 via the gas pipe 43, the gas introduction hole 44, and the cylinder 45. At this time, the gas pressure value of the gas chamber 47 maintains a steady value,
The float 50 does not operate. However, when a ground fault occurs in the gas insulated switchgear 41, the internal pressure in the container rises. Therefore, the gas-insulated switchgear 41
The gas pressure transmitted to the cylinder 45 via the gas pipe 43 and the gas introduction hole 44 increases from the gas pressure in the gas chamber 47. Due to this pressure difference, the float 50 in the cylinder 45 floats and the
Pushes the detection switch 46. As a result, the detection switch 46 opens and closes a detection circuit (not shown) to indicate a failure.

Conventionally, as a fault point locating system using such a fault point detector, a fault point locating system in which a fault point detector is individually provided in each of a plurality of gas compartments is generally considered. . By the way, when a failure point detector is individually provided for each gas section in this way, it is possible to individually monitor the gas pressure of a plurality of gas sections for each gas section.
This poses a heavy burden on the observer, increases the possibility of monitoring errors, and complicates the equipment. Therefore, from the viewpoint of efficiently monitoring the gas pressures of all gas compartments collectively at the same time, and from the viewpoint of simplifying the equipment, as described above, the failure point detectors are provided individually for each gas compartment,
A failure point locating system has been proposed in which a plurality of gas compartments having the same pressure are connected by gas pipes to collectively monitor the gas pressure.

[0017]

However, the conventional fault point locating system as described above has the following problems.
There are the following problems. That is, since a plurality of gas compartments are kept in an airtight state by insulating spacers, a failure point detector is individually provided for each gas compartment, and a plurality of gas compartments of the same pressure are connected by gas piping, When a failure such as a ground fault or short circuit occurs in the main bus of one gas compartment and the pressure rises rapidly, this rise in pressure is instantly propagated to the adjacent gas compartment via the gas pipe. there is a possibility. In this case, since the failure point detectors of the plurality of gas sections operate simultaneously, the whole of the plurality of gas sections is determined to be the failure point. Therefore,
If adjacent gas sections include different lines, the fault point detectors of multiple gas sections including multiple lines will operate simultaneously, and a healthy line will be detected as a fault line. .

As described above, when a sound line is also detected as a faulty line, the point where the accident occurred cannot be specified and the response to the accident becomes slower. It is impossible to restore the power transmission system early by utilizing the connected healthy line by remote control as described above. Therefore, in the conventional fault point locating system, the function that contributes to the early restoration of the power transmission system in the event of an accident, which is essentially required for the fault point locating system, cannot be fulfilled, and the reliability of the system is improved. There is a problem with sex.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
A highly reliable fault point locating system that can contribute to early restoration of the power transmission system in the event of an accident by allowing multiple gas sections to be efficiently monitored collectively and at the same time by significantly improving the fault point locating capability. Is to provide.

[0020]

In the fault point locating system of the present invention, an insulating gas is housed in a grounded metal container together with a high-voltage conductor, and the grounded metal container is divided into a plurality of gas compartments by a gas-tight insulating spacer. In order to locate the fault point of the divided gas-insulated equipment, each of the plurality of gas sections is individually provided with fault point detection means for detecting a fault occurring therein, and the plurality of gas sections are provided. In the fault point locating system in which the gas compartments having the same pressure among the gas compartments are connected in parallel by the gas pipe for collective monitoring, the following features are provided.

First, in the fault point locating system of claim 1, an individual gas pipe connected to the collective monitoring gas pipe is provided in each of the plurality of gas compartments, and the fault point detecting means is provided. Installed in the individual gas pipe portion, and suppressing the pressure propagation of gas in each of the individual gas pipes at a position closer to the collective monitoring gas pipe than the installation position of the failure point detection means. It is characterized in that a pressure propagation suppressing means is provided.

Further, in the fault point locating system according to the second aspect, the output signals output from each of the fault point detecting means of the plurality of gas sections are generally received and the arrival order of the output signals is determined. The output signal arrival order determination means for locating the failure point based on the earliest signal is provided.

[0023]

In the fault point locating system of the present invention having the above-mentioned structure, the gas pressures of a plurality of gas compartments can be collectively monitored through the collective monitoring gas pipes. When a failure occurs in such a gas section, the failure point can be accurately located for each gas section by the failure point detection means provided individually for each gas section, and no locating error occurs.

First, in the fault point locating system according to the first aspect, even if a fault such as a ground fault or a short circuit occurs in one gas section and the pressure rises rapidly, the increase in the pressure does not propagate. The pressure propagation suppressing means provided in the individual gas pipes suppresses the influence on the collective monitoring gas pipes, or the influence can be almost eliminated. As a result, the pressure wave of the gas pressure rise generated in one gas compartment can be attenuated to such an extent that it does not reach the operating level of the failure point detection means. However, only the failure point detection means of the gas section in which the failure has occurred operates, and the failure point detection means of the adjacent gas section does not operate. Therefore, even if adjacent gas sections include different lines, only the failure point detection unit of the gas section including the failure line operates, and the failure point detection unit of the gas section including only the sound line does not operate. , The problem of detecting a healthy line as a faulty line does not occur.

Further, in the fault point locating system according to the second aspect, if a failure such as a ground fault or a short circuit occurs in one gas compartment and the pressure rises sharply, the pressure rise is monitored collectively. Even if the failure point detecting means of the adjacent gas section is propagated to the adjacent gas section through the gas pipe for use in the operation, the output signal arrival order determining means determines the arrival order of the output signals from the failure point detecting means. And the fault point can be accurately located based on the earliest signal.

That is, it takes a certain period of time for the pressure increase to propagate from the defective gas compartment to the adjacent gas compartment via the collective monitoring gas pipe, so that the failure in the defective gas compartment occurs. Compared to the operation of the point detection means,
The operation of the failure point detection means in the adjacent gas section becomes slower, which causes a difference in signal output time from these failure point detection means. As a result, when a failure occurs in any one gas section, the output signal from the failure point detection means of the failed gas section is always more than the output signal from the failure point detection means of the adjacent gas section. Since the output signal arrival order determination means arrives at the earliest, the failure point can be accurately located by determining the arrival order of the output signals by the output signal arrival order determination means. Therefore, when the adjacent gas sections include different lines, even if the failure point detection means of the gas section including only the sound line operates, the gas section in which the failure has occurred is determined based on the determination of the order of arrival of the output signals. Since it can be accurately determined, there is no problem of detecting a healthy line as a faulty line.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of a fault point locating system according to the present invention will be specifically described below with reference to the drawings.

(1) First Embodiment ... FIG. 1 The first embodiment basically has a configuration as shown in FIG. FIG. 1 is a gas system diagram showing the outline of the configuration of the fault point locating system. As shown in FIG. 1, the line lines A-1L, B-1L, A-2L, B-2L are respectively connected between two main buses 1 and 2 via disconnectors DS _{1 to} DS _8. It is connected in parallel. In addition, in FIG. 1, A to L surrounded by a one-dot chain line indicate a plurality of pressure vessels of a main bus line section gas-tightly divided by an insulating spacer,
It forms a separate gas compartment. Each pressure vessel A-L
Both are set to the same pressure, and the pressure vessels A to F of one main busbar 1 part and the pressure vessels G to L of the other main busbar 2 part are respectively arranged in parallel by the gas pipe 3 for collective monitoring. The gas monitoring box 6 is connected so that the gas pressure can be monitored collectively for each of the main buses 1 and 2 parts. Generally, a normally open valve or the like is attached to the gas pipe 3 for convenience of gas treatment, but the display thereof is omitted here for the sake of simplification of description.

Further, each of the pressure vessels A to L is connected to a gas pipe 3 for collective monitoring via an individual gas pipe 4. A fault point locating sensor (fault point detecting means) 7 is connected to the individual gas pipe 4 via a gas pipe 5 branched from the gas pipe 4, and the individual gas pipe 4 is branched. A pressure propagation suppressing mechanism (pressure propagation suppressing means) 8 for suppressing gas pressure propagation is provided at a position closer to the collective monitoring gas pipe 3 than the portion. in this case,
Specifically, an impact pressure relay (SP relay) is used as the failure point locating sensor 7, and a "throttle portion" in which the pipe inner diameter is locally narrowed is used as the pressure propagation suppressing mechanism 8.

In the fault point locating system of the present embodiment having the above-mentioned configuration, the fault point can be accurately located for each of the pressure vessels A to L as described below. That is, first, when a failure such as a ground fault or a short circuit occurs in any of the pressure vessels A to L, the generated arc causes the gas pressure in the pressure vessel to rapidly rise. The pressure increase value ΔP at this time is obtained by the following equation (1).

[0031]

[Formula 1] ΔP = C (I · t / V) (1) However, ΔP: pressure increase value V: gas volume C: constant I: failure current t: energization time. By substituting, the expected pressure rise value is specifically obtained, but from the lower limit of the pressure rise value thus obtained, it is necessary for the operation of the SP relay used as the fault location sensor 7. It is estimated that the minimum operating level is about 0.03 to 0.01 kg / cm ² . This level of detection can be sufficiently supported by the SP relay currently being developed.

Here, a case where an accident occurs at point Q in the pressure vessel C shown in FIG. 1 will be described. In this case, the internal pressure of the pressure vessel C rises, and the pressure rise propagates through the gas pipes 4c and 5c, whereby the fault point locating sensor (SP relay) 7c operates.
At this time, the pressure wave due to the pressure rise in the pressure vessel C is directed to the collective monitoring gas pipe 3 via the gas pipe 4c,
In this embodiment, the gas pipe 5c in the gas pipe 4c
Since the pressure transmission suppressing mechanism (throttle portion) 8 is provided on the gas pipe 3 side of the above, the pressure transmission suppressing mechanism (throttle portion) is provided.
When the pressure wave passes through the pressure wave 8, the pressure rise peak value is reduced below the detection level of the fault location sensor (SP relay) 7. Therefore, this pressure wave is transmitted through the gas pipe 3 to the gas pipes 4 of the pressure vessels B and D that are adjacent to each other in a gas system.
Even if they propagate to b, 4d and gas pipes 5b, 5d, the respective fault location sensors (SP relays) 7b, 7d do not operate. That is, in this embodiment, only the failure point locating sensor (SP relay) 7c of the pressure vessel C in which the failure has occurred operates, and the failure point locating sensor (SP relay) of the pressure vessels B and C adjacent to each other in the gas system is operated. 7b and 7d never operate. FIG. 2 is an operation characteristic diagram showing the operation characteristics of the fault location sensor (SP relay) 7c, 7b in such a case.

As described above, in this embodiment, the plurality of pressure vessels A to F at one main busbar and the plurality of pressure vessels G to L at two main busbars of the gas insulated switchgear are respectively connected by the gas pipe 3. Despite being connected collectively in parallel, the function of the pressure propagation suppressing mechanism (throttle section) 8 causes only the failure point locating sensor of the pressure vessel in which the failure has occurred to operate, and pressures adjacent to each other in a gas system Since the failure point locating sensor of the container does not operate, the pressure vessel in which the failure has occurred can be accurately specified, and the failure point can be accurately located.

(2) Second Embodiment ... FIG. 3 The second embodiment basically has a structure as shown in FIG. FIG. 3 is a gas system diagram showing a part of the configuration of the fault point locating system. As shown in FIG. 3, in the present embodiment, each sensor output of the fault locating sensor (SP relay) 7 of the plurality of pressure vessels A to E connected to the same gas monitoring box 6 is output as an individual signal. It is configured to be collectively inputted to the output signal arrival order determination circuit (output signal arrival order determination means) 10 via the line 9. The output signal arrival order determination circuit 10 determines the arrival order of each sensor output signal from the fault locating sensor (SP relay) 7, and determines the pressure vessel in which the failure has occurred based on the output signal that reaches first. Is configured to. The parts other than the above structure are the same as those in the first embodiment.

In the fault point locating system of the present embodiment having the above-mentioned configuration, the fault point can be accurately located for each pressure vessel A to L as described below. That is, first, when a failure such as a ground fault or a short circuit occurs in any of the pressure vessels A to L, the generated arc causes the gas pressure in the pressure vessel to rapidly increase. ΔP is obtained by the above-mentioned equation (1). In addition, the minimum operation level required for the operation of the SP relay used as the fault location sensor 7 is
It is estimated to be about 0.03 to 0.01 kg / cm ² , and the detection level of this level can be sufficiently dealt with by the SP relay currently being developed, as described above.

Here, a case where an accident occurs at point Q in the pressure vessel C shown in FIG. 3 will be described. In this case, the internal pressure of the pressure vessel C rises, and the pressure rise propagates through the gas pipes 4c and 5c, whereby the fault point locating sensor (SP relay) 7c operates.
At this time, the pressure wave due to the pressure rise in the pressure vessel C is directed to the collective monitoring gas pipe 3 via the gas pipe 4c,
In this embodiment, the gas pipe 5c in the gas pipe 4c
Since the pressure transmission suppressing mechanism (throttle portion) 8 is provided on the gas pipe 3 side of the above, the pressure transmission suppressing mechanism (throttle portion) is provided.
As the pressure wave passes through 8, its peak pressure rise value is reduced. Then, the attenuated pressure wave propagates through the gas pipe 3 to the gas pipe 4b and the gas pipe 5b of the pressure vessel B which are gas systemically adjacent to each other, whereby the failure point locating sensor (SP relay) 7b operates.

In this case, the operation of the failure point locating sensor (SP relay) 7b of the pressure vessel B is performed from the gas pipe 4c more than the operation of the failure point locating sensor (SP relay) 7c of the pressure vessel C where the failure occurs. Gas pipe 4b through gas pipe 3
Will be delayed by the time difference according to the propagation path. In particular,
Since pressure propagation delay occurs due to the pressure propagation suppressing mechanism (throttle section) 8 provided in the middle of this propagation path, a large distance as shown in FIG. 4 is provided between these fault location sensors (SP relays) 7c and 7b. An operation time difference t ₁ will occur. In FIG. 4, P ₁ and P ₂ respectively indicate the pressure rise peak values of the fault location sensors (SP relays) 7c and 7b.

Here, FIG. 5 is an explanatory view for explaining the attenuation rate of the pressure wave depending on the size of the throttle portion used as the pressure propagation suppressing mechanism 8, in which 11 is a gas pipe, 12 is a throttle portion, and D is a throttle portion. , D indicate the respective inner diameter dimensions. As shown in FIG. 5, it has been confirmed that the attenuation rate (P ₂ / P ₁ ) of the pressure wave by the throttle portion 12 is substantially equal to the ratio (d / D) of the inner diameter dimension. Also, the operation time difference t ₁
With respect to the above, it has been confirmed that a time difference of several tens to several hundreds of msec can be secured by the configuration of the diaphragm that can be manufactured at present. If there is such a large time difference, the output signal arrival order determination circuit 10 having sufficient reliability can be configured according to the current technical level. Therefore, in this embodiment, the output signal arrival order determination circuit 10
Since the one sensor that operates first in the fault point locating sensor (SP relay) 7 can be easily and accurately discriminated, the pressure vessel in which the fault has occurred can be easily and accurately specified based on it. .

As described above, in the present embodiment, even if the fault point locating sensor of the pressure vessel other than the faulty pressure vessel operates, the output signal arrival order determination circuit 10 operates first. Since the failure point locating sensor can be easily and accurately determined, the pressure vessel in which the failure has occurred can be easily and accurately specified, and the failure point can be accurately located. Particularly, in the present embodiment, by providing the pressure propagation suppressing mechanism (throttle section) 8 in addition to the output signal arrival sequence determination circuit 10, the propagation time of the pressure wave can be sufficiently delayed, and the sensor Since the operation time difference can be made sufficiently large, the operation reliability of the output signal arrival order determination circuit 10 can be improved accordingly. Conversely, from the viewpoint of manufacturing, the accuracy required for the output signal arrival order determination circuit 10 can be lowered,
Manufacturing is easy.

(3) Other Embodiments The present invention is not limited to the above-described embodiments, and for example, as a modified example of the second embodiment, a structure in which the pressure propagation suppressing mechanism 8 is omitted may be adopted. Is. In this case, the effect of delaying the propagation time by the pressure propagation suppressing mechanism 8 cannot be obtained, but an operating time difference depending on the propagation path of the pressure wave always occurs between the failure point locating sensors on the failure side and the adjacent side. Moreover, by determining the order of arrival of the output signals, the fault point can be accurately located. Further, the failure point locating system of the present invention is not limited to the application to the main bus bar portion, but can be similarly applied to general gas insulation equipment having a plurality of gas compartments. Furthermore, the specific configurations of the failure point detection means, the pressure propagation attenuation means, the output signal arrival order determination means, etc. can be changed as appropriate.

[0041]

As described above, according to the fault point locating system of the present invention, the fault point detecting means is provided in each individual gas pipe connecting the plurality of gas compartments to the gas pipe for collective monitoring, and A pressure propagation suppressing means is provided on the gas pipe side for collective monitoring rather than the fault point detecting means of the gas pipe, or output signals from a plurality of fault point detecting means are comprehensively received and the order of arrival is determined. With a simple configuration that provides output signal arrival order determination means, it is possible to efficiently monitor multiple gas compartments collectively, and at the same time, it is possible to significantly improve the fault location capability and to improve the power transmission system in the event of an accident. It is possible to provide a highly reliable fault location system that can contribute to early recovery.

[Brief description of drawings]

FIG. 1 is a gas system diagram schematically showing the configuration of a first embodiment of a fault point locating system according to the present invention.

FIG. 2 is an operation characteristic diagram showing operation characteristics of a fault point locating sensor when a ground fault / short-circuit fault occurs at point Q in FIG.

FIG. 3 is a gas system diagram showing a part of the configuration of the second embodiment of the fault location system according to the present invention.

FIG. 4 is an operating characteristic diagram showing operating characteristics of a fault point locating sensor when a ground fault / short-circuit fault occurs at point Q in FIG. 3;

FIG. 5 is an explanatory view for explaining the attenuation rate of the pressure wave depending on the size of the throttle portion used as the pressure propagation suppressing mechanism of FIGS. 1 and 3.

FIG. 6 is a gas system diagram showing a general gas insulated switchgear.

FIG. 7 is a single line connection diagram showing an example of conventional system operation.

FIG. 8 is a sectional view showing an example of a conventional fault point detector.

[Explanation of symbols]

A-1L, B-1L, A-2L, B-2L ... line line DS ₁ to DS ₈ ... disconnector A to L ... pressure vessel 1, 2, the main bus 3-5 ... gas pipe 6 ... gas monitoring box 7 ... Fault location sensor 8 ... Pressure propagation suppression mechanism 9 ... Signal line 10 ... Output signal arrival order determination circuit 11 ... Gas piping 12 ... Throttle section 21 ... Sealed pressure vessel 22 ... Lightning arrester 23 ... Transformer 24 ... Grounding switch 25 ... Disconnector 26 ... Current transformer 27 ... Circuit breaker 28 ... Busbar 29 ... Insulating gas 30a-30d ... Insulating spacer 31 ... Gas cylinder 32 ... Gas cubicle 33 ... Valve 34 ... Bushing 35 ... Switchboard 36 ... Operation cubicle 37 ... Operator 38 ... Compressor equipment 39 ... Transformer 41 ... Gas insulated switchgear 43 ... Gas piping

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Sakakibara 2-1, Ukishimacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki Factory

Claims (2)

[Claims] 1. A gas insulation device in which an insulating gas is housed in a grounded metal container together with a high-voltage conductor, and the grounded metal container is divided into a plurality of gas compartments by gas-tight insulating spacers. In order to locate the above, each of the plurality of gas compartments is individually provided with a failure point detection means for detecting a failure occurring therein, and
In the fault point locating system, in which the gas compartments of the same pressure among the plurality of gas compartments are connected in parallel by the gas pipes for collective monitoring, in each of the plurality of gas compartments, the gas piping for collective monitoring and An individual gas pipe to be connected is provided, the failure point detecting means is installed in the individual gas pipe portion, and each of the individual gas pipes is provided with a position higher than the installation position of the failure point detecting means. A failure point locating system characterized in that a pressure propagation suppressing means for suppressing pressure propagation of gas is provided at a position close to a collective monitoring gas pipe. 2. A failure point for a gas-insulated device in which an insulating gas is housed in a grounded metal container together with a high-voltage conductor, and the grounded metal container is divided into a plurality of gas compartments by a gas-tight insulating spacer. In order to locate the above, each of the plurality of gas compartments is individually provided with a failure point detection means for detecting a failure occurring therein, and
In the fault point locating system in which the gas zones of the same pressure among the plurality of gas zones are connected in parallel by the gas pipe for collective monitoring, each of the fault point detecting means of the plurality of gas zones is output. A fault point locating system characterized by further comprising output signal arrival sequence discriminating means for receiving the output signals as a whole, discriminating the arrival order of the output signals, and locating the fault points based on the earliest arriving signal. .