JP2002354618A - Abnormality detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the detection of an abnormality caused by a contact failure when cracked gas exceeds a threshold while dispensing with work for the determination of an increase trend of the cracked gas for which several weeks have hitherto been needed in determining an abnormality, and to obtain an abnormality detecting device having high accuracy capable of exactly detecting contact resistance and the generation of the cracked gas in detecting the contact failure. SOLUTION: In the abnormality detecting device for a gas-insulated apparatus that insulates a conductor contact part 4 with gas filled in a vessel 1 and detects an abnormality of the conductor contact part 4, the detecting device comprises: a contact resistance detector 9 for detecting an increase of in contact resistance that is one of phenomena generating by stages in the process of the contact failure to develop to an accident; a cracked gas detector 6 for detecting the cracked gas that is one of the phenomena; and a determination circuit 12 for comparing an increase in the contact resistance in a certain period of an output value of the contact resistance detector 9 with a predetermined threshold when an output value of the cracked gas detector 6 exceeds the predetermined threshold. The detecting device determines an abnormality when the increase in the contact resistance exceeds the threshold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting device, and more particularly to an abnormality detecting device for detecting an abnormal portion due to a poor contact inside a gas insulating device by using various sensors.

[0002]

2. Description of the Related Art FIG.
It is a block diagram of the abnormality detection apparatus of the conventional gas insulation apparatus described in Unexamined-Japanese-Patent No. 448. In the figure, 1 is a cylindrical gas insulating container in which an insulating gas is sealed, 2 is a central conductor, 3 is a gas dividing spacer, and 4 is a conductor connecting portion. When a contact failure occurs in the conductor connection portion 4, abnormal heat generation occurs, and a decomposition gas 5 is generated.
Is detected by Reference numeral 7 denotes a decomposition gas calculation circuit that processes an output signal of the decomposition gas detector 6.

In such a conventional abnormality detecting device, the central conductor 2 is formed by the gas sealed in the gas insulating container 1.
Are insulated. When a contact failure occurs in the conductor connection portion 4 of the center conductor 2, a decomposition gas 5 is generated in association with the contact failure. Since the generated decomposed gas 5 is overheated by the heat generated in the contact portion, the decomposed gas 5 rises to the upper portion of the tank due to the density difference of the peripheral gas, and the decomposed gas detector 6 detects the decomposed gas 5.

[0004]

In the above-described conventional abnormality detection apparatus, an abnormality is determined for the decomposed gas only by the decomposed gas detector. It was necessary to detect the increasing trend because the cracked gas concentration increased. Therefore, in the abnormality determination, it is necessary to detect an increasing tendency of the concentration of the decomposition gas with the passage of time, and it takes several weeks for the abnormality determination.

[0005] In addition, since decomposed gas is generated even when the circuit breaker is normally turned on, for the decomposed gas detector attached to the circuit breaker, whether the detected decomposed gas is due to the normal closing operation, It was difficult to judge whether it was due to decomposition gas generation due to poor contact.

Further, it is difficult to know how much the contact failure has progressed when the decomposition gas is detected, and it is determined that the state of the gas insulation device is abnormal by detecting the decomposition gas, and the current flowing through the center conductor is determined. It was difficult to automatically operate gas insulation equipment such as shutting off (from on to off).

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to shorten the time required for determining the occurrence of decomposition gas generation abnormality, and to improve the detection accuracy of decomposition gas due to poor contact of a circuit breaker. An object of the present invention is to obtain a highly accurate abnormality detection device by reliably detecting a contact failure of a conductor connection portion of a gas insulating device. Another object of the present invention is to provide an abnormality detection device that can automatically operate a gas insulation device based on the degree of progress of a contact failure.

[0008]

According to a first aspect of the present invention, there is provided an abnormality detecting apparatus for insulating a conductor connection portion by a gas sealed in a cylindrical container and detecting an abnormality of the conductor connection portion. In a device abnormality detection device, a contact resistance detector that detects an increase in contact resistance, which is one of the phenomena that occurs stepwise in the process of a poor contact progressing to an accident, and a decomposition gas that is one of the above phenomena, A cracked gas detector to be detected, and when the output value of the cracked gas detector exceeds a predetermined threshold, a contact resistance increase for a certain period of time of the output value of the contact resistance detector is predetermined. And a determination circuit for comparing with the threshold value, and when the increase in the contact resistance exceeds the threshold value, it is determined that there is an abnormality.

The abnormality detecting device according to a second aspect of the present invention is the abnormality detecting device according to the first aspect of the present invention, further comprising a gas temperature detector for detecting an increase in the gas temperature, which is one of the above phenomena. When the output value of the detector exceeds a predetermined threshold, the contact resistance increase of the output value of the contact resistance detector is compared with a predetermined threshold for a certain period of time, and the gas temperature detector Is compared with a predetermined threshold value, and when the contact resistance increase amount and the gas temperature increase amount exceed the threshold values, it is determined that there is an abnormality.

According to a third aspect of the present invention, in the abnormality detecting device according to the first aspect of the present invention, there is provided a gas temperature detector for detecting an increase in gas temperature which is one of the above phenomena, and a part which is one of the above phenomena. A partial discharge detector for detecting discharge, wherein the determination circuit determines that the output value of the contact resistance detector has a predetermined period when the output value of the partial discharge detector exceeds a predetermined threshold. The contact resistance increase is compared with a predetermined threshold, and the gas temperature increase for a certain period of the output value of the gas temperature detector is compared with a predetermined threshold, and the output value of the decomposition gas detector is compared. Is compared with a predetermined threshold value, and when the contact resistance increase amount, the gas temperature increase amount, and the cracked gas increase amount exceed the threshold values, it is determined that there is an abnormality. .

According to a fourth aspect of the present invention, there is provided an abnormality detecting apparatus for a gas insulated device which insulates a conductor connection portion with a gas sealed in a cylindrical container and detects an abnormality in the conductor connection portion. , A cracked gas detector that detects cracked gas generated when switching the current flowing through a conductor, and a contact resistance detection that detects contact resistance, which is one of the phenomena that occurs stepwise in the process of poor contact progressing to an accident A gas temperature detector for detecting a gas temperature which is one of the above phenomena, and an output value of the contact resistance detector when an output value of the decomposition gas detector exceeds a predetermined threshold. A determination circuit that compares the contact resistance increase for a certain period with a predetermined threshold and compares the gas temperature increase for a certain period of the output value of the gas temperature detector with a predetermined threshold. Prepared, Resistance increase and the gas temperature increase is what determines the normal when it is fixed without exceeding the threshold.

An abnormality detecting apparatus according to a fifth aspect of the present invention is the abnormality detecting apparatus according to any one of the first to fourth aspects, further comprising a control circuit for controlling the gas-insulated equipment based on a result of the determination by the determination circuit. is there.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing Embodiment 1 of the present invention. In the figure, 1 is a gas insulating container, 2 is a center conductor, 3 is a gas dividing spacer, and 4 is a conductor connecting portion. When contact failure occurs in the conductor connection portion 4, a decomposition gas 5 is generated. Reference numeral 6 denotes a cracked gas detector for detecting the cracked gas 5 generated due to poor contact, 7 a cracked gas arithmetic circuit for processing a signal from the cracked gas detector 6, and 8 a cracked gas output from the cracked gas arithmetic circuit 7. A gas output, 9 is a contact resistance detector for detecting an increase in contact resistance caused by poor contact, 10 is a contact resistance arithmetic circuit for processing a signal from the contact resistance detector 9, and 11 is an output from the contact resistance arithmetic circuit 10. The contact resistance output. These cracked gas outputs 8
Based on the signal output from the contact resistance output 11 and the output from the contact resistance output 11, the determination circuit 12 determines whether or not an abnormality has occurred.

Before describing the operation of the abnormality detecting device configured as described above, a phenomenon caused by a poor contact in the gas-insulated equipment will be described with reference to FIG.

FIG. 2 shows the progress of poor contact and the increasing tendency of the concentration of cracked gas. If there is a poor contact in the center conductor, no decomposition gas is generated in the initial stage. As the process proceeds to the next stage, the contact resistance increases and the defective portion generates heat accordingly. When the poor contact portion generates heat, the heat causes the central conductor to be made of metal.
Melts. When the calorific value increases and reaches a temperature equal to or higher than the melting point of the contact portion, intermittent firing occurs. As the arc is repeated, the melting of the poorly contacted portion expands, and a transition is made to continuous arcing (partial discharge).

[0016] Then, the conductor is shifted downward due to the fusing of the poor contact portion, and the scattering of the molten material by the arc overlaps to generate a ground fault. The occurrence of the partial discharge is the final stage of the contact failure, and in some cases, it may take several hours from the partial discharge to the ground fault. In addition, the decomposition gas concentration gradually starts to increase due to generation of the decomposition gas from the stage where the contact resistance increases, and increases with time as the contact failure progresses.

Next, the operation will be described with reference to FIG. If a contact failure occurs in the conductor connection part 4, the contact resistance increases. This increase in the contact resistance is detected by the contact resistance detector 9, the contact resistance is calculated by the contact resistance calculation circuit 10, and is output to the determination circuit 12 as the contact resistance output 11. Further, when the contact failure progresses, a cracked gas 5 is generated, and the cracked gas 5 is detected by the cracked gas detector 6, and the cracked gas concentration is calculated by the cracked gas arithmetic circuit 7,
This is output to the determination circuit 12 as the decomposition gas output 8. The determination circuit 12 monitors the contact resistance output 11 and the decomposition gas output 8, and as shown in FIG.
When the contact resistance increase ΔR during a certain period T1 of the insulation resistance output 11 exceeds a certain threshold at time T at which a predetermined threshold is reached, it is determined that the gas insulation device is abnormal. .

As described above, in the present embodiment, an abnormality due to poor contact is detected when the decomposition gas exceeds a certain threshold value without performing the judgment of the increase tendency of the decomposition gas which required several weeks for the abnormality judgment. I can do it. In addition, an abnormality detection device with high accuracy can be obtained by reliably detecting the contact resistance and the generation of the decomposition gas in the detection of the contact failure.

Embodiment 2 FIG. FIG. 4 is a configuration diagram showing a second embodiment of the present invention. In FIG. 4, FIG.
The same reference numerals are given to the portions corresponding to and the detailed description will be omitted. In the figure, reference numeral 13 denotes a gas temperature detector that detects an increase in gas temperature that rises due to poor contact, 14 denotes a gas temperature calculation circuit that processes a signal from the gas temperature detector 13,
Reference numeral 15 denotes a gas temperature output output from the gas temperature calculation circuit 14. Based on the signals output from the contact resistance calculation circuit 10, the gas temperature calculation circuit 13, and the decomposition gas calculation circuit 6, the determination circuit 12 determines whether or not an abnormality has occurred. Other configurations are the same as those in FIG. Also,
The phenomenon caused by the poor contact in the gas-insulated equipment is as described with reference to FIG. 2 of the first embodiment.

Next, the operation will be described with reference to FIG. If a contact failure occurs in the conductor connection part 4, the contact resistance increases. The increase in the contact resistance is detected by the contact resistance detector 9, the contact resistance is calculated by the contact resistance calculation circuit 10, and the calculated contact resistance is output to the determination circuit 12. Further, with the increase in the contact resistance, the defective portion generates heat and the gas temperature rises. The gas temperature that rises with the progress of poor contact is measured by the gas temperature detector 1
3, the gas temperature is calculated by the gas temperature calculation circuit 14 and output to the determination circuit 12.

Further, when the contact failure progresses, a cracked gas is generated. The cracked gas is detected by the cracked gas detector 6 and the cracked gas calculation circuit 7 calculates the cracked gas concentration.
This is output to the determination circuit 12 as the decomposition gas output 8. The determination circuit 12 monitors the contact resistance output 11, the gas temperature output 15, and the decomposition gas output 8. As shown in FIG. 5, for example, at the time T when the cracked gas output 8 reaches a predetermined threshold, the contact resistance increase ΔR during a certain period T1 tends to increase beyond a certain threshold, and the gas temperature increases. Output 1
If the gas temperature increase ΔC during a certain period T2 of 5 exceeds a certain threshold and is increasing, it is determined that the gas insulation device is abnormal.

As described above, in the present embodiment, an abnormality due to poor contact is detected when the decomposition gas exceeds a certain threshold value without performing the determination of the tendency of the decomposition gas to increase, which required several weeks for the abnormality judgment. I can do it. In addition, an abnormality detection device with high accuracy can be obtained by reliably detecting the contact resistance, the gas temperature, and the generation of the decomposed gas in detecting the contact failure.

The determination circuit 12 determines that the contact resistance increase ΔR even before the decomposition gas output 8 reaches the predetermined threshold value.
And an increase ΔC in the gas temperature are monitored, and if these tend to increase beyond a certain threshold value, it is determined that the contact resistance is cautious and the gas temperature is caution. As described above, it is possible to know to what stage the contact failure has progressed by checking the caution determination based on the contact resistance and the gas temperature and the abnormality determination based on the decomposition gas.

Embodiment 3 FIG. FIG. 6 is a configuration diagram showing a third embodiment of the present invention. In FIG. 6, FIG.
4 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the drawing, reference numeral 16 denotes a partial discharge detector for detecting a partial discharge which increases due to continuous firing of the conductor connection portion 4 at the last stage of contact failure, and 17 denotes a partial discharge detector 16
A partial discharge arithmetic circuit 18 processes a signal from the partial discharge arithmetic circuit 17, and a partial discharge output 18 output from the partial discharge arithmetic circuit 17. Based on signals from the decomposition gas output 8, the contact resistance output 11, the gas temperature output 15, and the partial discharge output 18, the determination circuit 12 determines whether or not an abnormality has occurred. Reference numeral 19 denotes a control circuit for controlling the gas-insulated equipment based on a control signal 20 output from the determination circuit 12. Other configurations are the same as those in FIGS. 1 and 4. Further, a phenomenon caused by a poor contact in a gas insulated device is described in the first embodiment.
2 as described with reference to FIG.

Next, the operation will be described with reference to FIG. The phenomena occurring with the progress of poor contact are detected by the contact resistance detector 9, the gas temperature detector 13, and the decomposition gas detector 6, and the respective outputs are monitored by the determination circuit 12. Is the same as After the stage in which the contact failure has progressed and the decomposition gas has been generated, the phenomenon further progresses, and in the final stage, intermittent firing leads to continuous firing, and partial discharge occurs. The partial discharge that increases with the progress of the contact failure is detected by the partial discharge detector 16, the partial discharge is calculated by the partial discharge calculation circuit 17, and is output to the determination circuit 12.

In the determination circuit 12, for example, at time T when a partial discharge occurs, the contact resistance increase ΔR during a certain period T1 of the contact resistance output 11, and the gas temperature increase during a certain period T2 of the gas temperature output 15 If the amount of decomposition gas increase ΔB during a certain period T3 of the decomposition gas output 8 and the decomposition gas ΔC exceeds a certain threshold value, respectively, the contact failure occurs surely and is in the final stage. It is determined that there is an abnormality, and a control signal 20 is output to the control circuit 19. When the control signal 20 is input, the control circuit 19 stops the device in which the contact failure has occurred.

As described above, in the present embodiment, the contact resistance, the gas temperature, the decomposition gas, and the occurrence of the partial discharge are surely detected in the detection of the contact failure. Control can be performed, and a highly accurate abnormality detection device can be obtained.

Further, even before the partial discharge occurs, the determination circuit 12 determines that the contact resistance increase ΔR, the gas temperature increase ΔC,
The amount of increase in the decomposition gas ΔB is monitored, and if these increase beyond a certain threshold, it is determined that the contact resistance is cautious, the gas temperature is cautious, and the decomposition gas is generated (abnormal contact failure).

As described above, even before partial discharge occurs,
It is possible to know to what stage the contact failure has progressed by looking at the caution determination based on the contact resistance and the gas temperature and the abnormality determination based on the decomposition gas.

In the present embodiment, the example of detecting a contact failure due to partial discharge described in the third embodiment is described in the second embodiment.
However, similar effects can be obtained by adding the first embodiment.

Embodiment 4 FIG. FIG. 8 is a configuration diagram showing a fourth embodiment of the present invention. 8, parts corresponding to those in FIGS. 1, 4, and 6 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the figure, 2a is a movable center conductor, 2b is a fixed center conductor, and 21 is an arc generated by the opening operation. Other configurations are the same as those in FIGS. 1, 4, and 6. Further, the phenomenon caused by the poor contact in the gas insulated equipment is as described in FIG. 2 of the first embodiment.

Before describing the operation of the abnormality detecting device configured as described above, first, the phenomenon that occurs when the main circuit is opened in the gas-insulated equipment will be described. When interrupting the current flowing through the center conductors 2a and 2b in the gas insulated equipment, the movable center conductor 2a moves in the direction of the arrow from the position shown by the dotted line, but the arc 21 is generated for a short time because the current flowing through the center conductor is large. After that, it moves to the position shown by the solid line, the current is cut off, and the opening operation of the main circuit ends. During this operation, the gas in the gas insulating device is heated by the arc generated for a very short time to generate the decomposed gas 5, but the arc is generated only for a very short time, and as shown in FIG. The output 8 is cooled to the surrounding gas, decreases with time, and finally becomes zero.

Next, the operation will be described with reference to FIG. Opening the main circuit of gas-insulated equipment causes arc 2
The generation of 1 generates a decomposition gas 5, which is detected by a decomposition gas detector 6, a decomposition gas calculation circuit 7 calculates a decomposition gas concentration, and is output as a decomposition gas output 8 to a determination circuit 12. However, since the opening operation of the main circuit is a normal operation of the gas insulated device and no contact failure has occurred, the contact resistance and the gas temperature remain constant and do not change. In the determination circuit 12, the contact resistance output 11, the gas temperature output 15, and the decomposition gas output 8 are monitored. As shown in FIG. 9, for example, at the time T when the decomposition gas output 8 reaches a predetermined threshold value, When the resistance output 11 and the gas temperature output 15 are constant, it is determined that generation of the decomposition gas is a normal operation by operating the main circuit.

As described above, it is determined that the gas insulated equipment is normal when the decomposition gas exceeds a certain threshold value without performing the decrease tendency judgment that required several weeks for the normal judgment of the decomposition gas by operating the main circuit. You can do it. The detection of the contact failure is the same as that described in the third embodiment.

As described above, in the present embodiment, it is determined whether the decomposition gas generated in the gas insulating device having the function of opening and closing the center conductor is the generation of the decomposition gas by operating the main circuit or the abnormality due to the poor contact. It is possible to obtain a highly accurate abnormality detection device capable of detecting the abnormality.

The control circuit 19 used in the third and fourth embodiments for controlling the gas-insulated equipment by the control signal 20 output from the determination circuit 12 may be used in the first and second embodiments. Thus, the same effects as those of the third and fourth embodiments can be obtained.

[0037]

As described above, according to the first aspect of the present invention, there is provided a gas insulated apparatus for insulating a conductor connection portion by a gas sealed in a cylindrical container and detecting an abnormality of the conductor connection portion. In the abnormality detection device, a contact resistance detector that detects an increase in contact resistance, which is one of the phenomena that occurs stepwise in the process of a poor contact progressing to an accident, and a decomposed gas that is one of the above phenomena is detected. A cracked gas detector, and when the output value of the cracked gas detector exceeds a predetermined threshold, the contact resistance increase for a certain period of time of the output value of the contact resistance detector is set to a predetermined threshold. And a determination circuit for comparing the contact resistance increase with the increase in the contact resistance exceeds the threshold value. When the gas exceeds a certain threshold Touch can be detected abnormalities due to defective, and there is an effect that the accuracy can be obtained a high abnormality detection device by reliably detecting the contact resistance with the decomposition gas generated in the detection of contact failure.

According to a second aspect of the present invention, there is provided a gas temperature detector for detecting an increase in gas temperature, which is one of the above phenomena, and the determination circuit determines the output value of the decomposition gas detector in advance. When the threshold value is exceeded, the contact resistance increase in the output value of the contact resistance detector for a certain period is compared with a predetermined threshold value, and the output value of the gas temperature detector is used for a certain period. The increase in the gas temperature is compared with a predetermined threshold, and if the increase in the contact resistance and the increase in the gas temperature exceed the threshold, it is determined that the contact is abnormal. And the generation of cracked gas can be reliably detected, and a highly accurate abnormality detection device can be obtained. Is progressing There is an effect that can be known easily.

According to the third aspect of the present invention, a gas temperature detector for detecting an increase in gas temperature which is one of the above phenomena, and a partial discharge detector for detecting a partial discharge which is one of the above phenomena When the output value of the partial discharge detector exceeds a predetermined threshold, the determination circuit determines a contact resistance increase for a certain period of time of the output value of the contact resistance detector in advance. Comparing the gas temperature increase in the output value of the gas temperature detector for a certain period with a predetermined threshold value, and comparing the output value of the decomposition gas detector for a certain period of time with the output value of the decomposition gas detector. The increase is compared with a predetermined threshold, and if the contact resistance increase, the gas temperature increase, and the decomposition gas increase exceed the threshold, it is determined to be abnormal.
By reliably detecting contact resistance, gas temperature, decomposition gas, and the occurrence of partial discharge in the detection of contact failure, a highly accurate abnormality detection device can be obtained. By observing the caution determination based on the gas temperature and the abnormality determination based on the decomposition gas, there is an effect that it is possible to easily know to what stage the poor contact has progressed.

According to the fourth aspect of the present invention, there is provided an abnormality detecting apparatus for a gas insulating device for insulating a conductor connection portion by a gas sealed in a cylindrical container and detecting an abnormality of the conductor connection portion. A cracked gas detector that detects cracked gas generated when switching the current flowing through a conductor, and a contact resistance detector that detects contact resistance, which is one of the phenomena that occurs stepwise in the process of a poor contact progressing to an accident A gas temperature detector for detecting a gas temperature which is one of the above phenomena; and an output value of the contact resistance detector when an output value of the decomposition gas detector exceeds a predetermined threshold. A determination circuit that compares the contact resistance increase for a certain period with a predetermined threshold value and compares the gas temperature increase for a certain period of the output value of the gas temperature detector with a predetermined threshold value; , Above contact resistance If the addition and the increase in the gas temperature are constant without exceeding the threshold value, it is determined to be normal, so the decomposition gas generated in the gas insulation device having the function of opening and closing the center conductor is the decomposition gas generated by the main circuit operation. It is possible to obtain a highly accurate abnormality detection device capable of detecting whether the error is caused by a contact failure or an abnormality due to poor contact.

Further, according to the fifth aspect of the present invention, since the control circuit for controlling the gas insulated equipment based on the determination result of the determination circuit is provided, it is difficult to measure only the decomposition gas. Control can be performed, and there is an effect that a highly accurate abnormality detection device can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a process of developing a contact failure and an increasing tendency of a decomposition gas concentration in Embodiments 1 to 4 of the present invention.

FIG. 3 is a diagram showing an output example of a contact resistance output and a cracked gas output according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing output examples of a contact resistance output, a gas temperature output, and a cracked gas output in Embodiment 2 of the present invention.

FIG. 6 is a configuration diagram showing a third embodiment of the present invention.

FIG. 7 is a diagram showing an output example of a contact resistance output, a gas temperature output, a decomposition gas output, and a partial discharge output in Embodiment 3 of the present invention.

FIG. 8 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a response example of a contact resistance output, a gas temperature output, and a decomposition gas output in Embodiment 4 of the present invention.

FIG. 10 is a configuration diagram showing a conventional abnormality detection device for gas-insulated equipment.

[Explanation of symbols]

1 gas insulated container, 2 center conductor, 2a movable center conductor, 2b fixed center conductor, 3 gas division spacer, 4
Conductor connection part, 5 decomposition gas, 6 decomposition gas detector, 7
Decomposition gas calculation circuit, 8 decomposition gas output, 9 contact resistance detector, 10 contact resistance calculation circuit, 11 contact resistance output,
12 judgment circuit, 13 gas temperature detector, 14 gas temperature calculation circuit, 15 gas temperature output, 16 partial discharge detector, 17 partial discharge calculation circuit, 18 partial discharge output, 1
9 control circuits, 20 control signals, 21 arcs.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 5/06 391 H02H 5/00 C H02H 5/00 H02B 13/06 C

Claims (5)

[Claims] 1. An abnormality detecting device for a gas-insulated device for insulating a conductor connection portion with a gas sealed in a cylindrical container and detecting an abnormality in the conductor connection portion, wherein the contact failure occurs in a process of developing into an accident. A contact resistance detector that detects an increase in contact resistance that is one of the phenomena that occurs stepwise; a cracked gas detector that detects a cracked gas that is one of the phenomena; and an output value of the cracked gas detector When the threshold value exceeds a predetermined threshold, a determination circuit that compares the contact resistance increase of the output value of the contact resistance detector for a certain period of time with a predetermined threshold, and An abnormality detection device that determines that an abnormality has occurred when the value exceeds the threshold value. 2. A gas temperature detector for detecting an increase in gas temperature, which is one of the above phenomena, wherein the determination circuit determines whether an output value of the decomposition gas detector exceeds a predetermined threshold. The contact resistance increase of the output value of the contact resistance detector for a certain period is compared with a predetermined threshold value, and the gas temperature increase of the output value of the gas temperature detector for a certain period is determined in advance. 2. The abnormality detection device according to claim 1, wherein an abnormality is determined when the increase in the contact resistance and the increase in the gas temperature exceed the threshold. 3. A gas temperature detector for detecting an increase in gas temperature, which is one of the above phenomena, and a partial discharge detector for detecting a partial discharge, which is one of the above phenomena. When the output value of the partial discharge detector exceeds a predetermined threshold, the contact resistance increase in the output value of the contact resistance detector for a certain period is compared with a predetermined threshold, and the gas temperature Compare the gas temperature increase for a certain period of the output value of the detector with a predetermined threshold, and the decomposition gas increase for a certain period of the decomposition gas detector output value with a predetermined threshold. 2. The abnormality detection device according to claim 1, wherein an abnormality is determined when the increase in the contact resistance, the increase in the gas temperature, and the increase in the decomposition gas exceed the threshold. 4. An abnormality detecting device for a gas insulating device for insulating a conductor connection portion by a gas sealed in a cylindrical container and detecting an abnormality of the conductor connection portion, wherein the abnormality occurs when a current flowing through a conductor is opened and closed. And a contact resistance detector that detects contact resistance, which is one of the phenomena that occurs step by step in the process of a poor contact progressing to an accident. A gas temperature detector for detecting a gas temperature, and when an output value of the decomposition gas detector exceeds a predetermined threshold, an increase in the contact resistance of the output value of the contact resistance detector for a certain period. Compare with a predetermined threshold,
A determination circuit for comparing the gas temperature increase for a certain period of the output value of the gas temperature detector with a predetermined threshold, wherein the contact resistance increase and the gas temperature increase do not exceed the threshold. An abnormality detection device that determines that the condition is normal when the value is constant. 5. The abnormality detection device according to claim 1, further comprising a control circuit for controlling a gas-insulated device based on a determination result of the determination circuit.