JP2001186613A - Gas-insulated electrical machinery and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem, associated with gas-insulated electrical machinery and apparatus provided with a conventional gas sensor, that the output level is lowered due to aging of a gas sensor and a gas sensor installed for an extended period of time can overlook any anomaly occurring in a gas section. SOLUTION: Mean value and standard deviation are periodically calculated from the outputs of gas sensors 6a, 6b, 6c, and 6d respectively installed in a plurality of gas sections 1a, 1b, 1c, and 1d filled with insulating gas for insulating a housed central conductor 4, using a signal processor 16. Criteria for acceptance/rejection are established based thereon, and the outputs of the gas sensors 6a, 6b, 6c, and 6d are judged against the periodically established criteria for acceptance/rejection. As a result, any anomaly in the gas section 1a, 1b, 1c, and 1d is detected with the influences of aging of the gas sensors eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated electric device installed in a substation having a basic function of power transmission and transformation.

[0002]

2. Description of the Related Art First, a conventional gas-insulated electric device provided with a gas sensor will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 is a configuration diagram showing a gas-insulated electric device provided with a conventional gas sensor disclosed in, for example, Japanese Patent Application Laid-Open No. 8-271577. In FIG. 9, 1a, 1b, 1
c, 1d the gas sections insulated gas such as SF ₆ is sealed, 2 envelope partitions the inside and the outside air in the gas segment 1 a to 1 d, 3a, 3b, 3c, 3d gas segment 1 a to 1 d
A central conductor supported at the center of the jacket 2 by spacers 3a to 3d; 5a, a ground fault generated between the central conductor 4 and the jacket 2; 5b is an arc generated at the ground fault point 5a, 6a, 6
b, 6c and 6d are gas sections 1a, 1b, 1c and 1 respectively.
A gas sensor for detecting the amount of decomposed gas inside d by applying a voltage, 7 is a fault current detector, and 8 is a control arithmetic unit.

In a gas-insulated electric device that is energized, a high voltage and a large current flow through the center conductor 4, and the insulating gas sealed inside each of the gas sections 1a to 1d causes
Insulation performance is maintained. For example, when a ground fault occurs in the ground section 5a inside the gas section 1c, the high temperature of the arc 5b decomposes the insulating gas inside the gas section 1c, and the decomposed gas is generated near the ground fault section 5a. I do. The decomposed gas generated at this time is diffused inside the gas section 1c. If the gas sensor 6c detects the amount of the decomposed gas exceeding a predetermined value, the control arithmetic unit 8 controls the gas section 1c.
c is determined to be an internal abnormality.

When a voltage is constantly applied to the gas sensors 6a to 6d, the life of the sensor elements is shortened, and
Since malfunctions due to external noise are likely to occur, the control arithmetic unit 8 controls the gas sensors 6a to 6d so as to apply a voltage only to an internal accident detected by the fault current detector 7 in order to prevent them. .

Next, the configuration shown in FIG. 10 will be described. FIG. 10 is a configuration diagram showing a gas-insulated electric device provided with a conventional gas sensor disclosed in Japanese Patent Application Laid-Open No. 8-271577. 10, 2, 3a, 3b, and 4 are the same as those in FIG. 1 is a gas section filled with an insulating gas such as SF ₆ , 6 is a gas sensor for detecting the amount of decomposed gas inside the gas section 1 by applying a voltage, 10 is a current interrupting section electrically connected to the central conductor 4, Reference numeral 11 denotes an arc generated when the current is interrupted by the current interrupting unit 10. 13 is an output signal of the gas sensor 6, and 14 is a gas sensor control signal for controlling the gas sensor 6.

In a gas-insulated electric device that is energized, high voltage and large current flow through the central conductor 4, and the insulation performance is maintained by the insulating gas sealed inside the gas section 1. Further, when the current is interrupted by the current interrupting unit 10, an insulating gas is required to obtain a predetermined interrupting performance. For example, when an internal abnormality such as a partial discharge or a ground fault occurs in the gas section 1, if the amount of the decomposed gas exceeds a predetermined value by the gas sensor 6 in the same manner as shown in FIG. Is determined to be an internal abnormality. Also,
Even if the decomposed gas is accumulated in the gas section 1 over time and the gas sensor 6 detects the decomposed gas amount exceeding a predetermined value, it is also determined that an internal abnormality has occurred.

[0007] Decomposition gas is also generated when the current interrupting unit 10 normally performs an interrupting operation. In order to prevent erroneous determination of the occurrence of decomposition gas at this time as an internal abnormality, a current interruption is performed. The gas sensor control signal 14 is used to mask the detection function of the gas sensor 6 by using the cutoff command signal.

As described above, when the gas sensor 6 detects a decomposition gas exceeding a predetermined value, the gas sensor 6 is used to notify that an abnormality has occurred in the gas section 1 of the gas insulated electric equipment. I was Further, for example, when a solid electrolyte is used as the decomposition gas detection element of the gas sensor 6, as the cumulative time of the voltage applied to both electrodes of the solid electrolyte during the measurement of the decomposition gas increases, the detection sensitivity decreases. There has been no means for correcting a decrease in detection sensitivity.

[0009]

SUMMARY OF THE INVENTION In such a gas-insulated electric device having the conventional gas sensor shown in FIG.
When a decomposed gas is generated due to a ground fault or the like inside the gas sections 1a to 1d, the output level of the gas sensor 6a to 6d is determined by the output level of the gas sensor 6a to 6d in the gas section 1a to 1d. Has been determined based on whether or not the predetermined value recorded in the above is exceeded. Therefore, the gas sensor 6
Since the problems of aged deterioration of a to 6d, that is, the problem that the output level decreases as the cumulative exposure time in an insulating gas such as SF ₆ increases, the gas sensors 6a to 6d mounted for a long time are However, there is a problem that the output level when an abnormality occurs in the gas sections 1a to 1d is low, does not reach a predetermined value recorded in the control arithmetic unit 8, and the abnormality detection may be overlooked.

In the conventional gas-insulated electrical equipment provided with a gas sensor, the internal abnormality of the gas sections 1a to 1d does not take into account the aging of the mounted gas sensors 6a to 6d. Could not be determined as failure without removing and inspecting.

In the gas-insulated electric equipment having the conventional gas sensor shown in FIG. 10, the presence or absence of an internal abnormality such as partial discharge or ground fault in the gas section 1 is detected by the gas sensor 6 to determine the amount of the decomposed gas. Thus, the determination is made. However, when, for example, a solid electrolyte is used as the decomposed gas detection element of the gas sensor 6, the detection sensitivity decreases as the cumulative time of the voltage applied to both electrodes of the solid electrolyte increases. Therefore, the detection level of the decomposed gas when the decomposed gas is generated inside the gas section 1 is different between the output level of the gas sensor 6 when the accumulated time of the applied voltage is short and long, and when the accumulated time of the applied voltage is long. Since the output level is low and does not reach the predetermined value determined to be abnormal, there is a problem that detection of the abnormality is overlooked. That is, a function for correcting a decrease in detection sensitivity due to an increase in the cumulative voltage application time of the gas sensor 6 for detecting the amount of decomposed gas is not provided.

Further, the detection sensitivity of the gas sensor 6 is reduced.
The function of determining whether or not the gas sensor 6 needs to be replaced when the gas sensor 6 exceeds the allowable value is not provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made to eliminate the adverse effect of aging of a gas sensor and to perform a more reliable accident detection inside a gas section. The primary objective is to obtain gas-insulated electrical equipment. It is a second object of the present invention to obtain a gas-insulated electric device capable of detecting an abnormality of a gas sensor.

It is a third object of the present invention to provide a gas-insulated electrical device in which the influence of the decrease in detection sensitivity due to the increase in the cumulative voltage application time of the gas sensor is eliminated. It is a fourth object of the present invention to provide a gas-insulated electrical device capable of determining the life of a gas sensor.

[0015]

In a gas insulated electric device according to the present invention, the electric device is housed,
Equipped with a plurality of gas sections each filled with a gas that insulates electrical equipment, and a plurality of gas sensors for detecting the amount of decomposed gas in each of the gas sections, and periodically using the outputs of the plurality of gas sensors, A first pass / fail judgment criterion, which is a criterion for judging a segment abnormality, is calculated, and an abnormality of a gas segment is judged based on an output of each gas sensor based on the first pass / fail judgment criterion.

Further, the electric equipment includes a gas section in which a gas for insulating the electric apparatus is sealed, and a plurality of gas sensors for detecting an amount of decomposed gas in the gas section. A second pass / fail criterion for periodically determining an abnormality of the gas sensor using the output is calculated, and a failure of each gas sensor is determined based on an output of each gas sensor based on the second pass / fail criterion. The pass / fail criterion is calculated using the average value and the standard deviation of the outputs of the plurality of gas sensors.

Furthermore, a gas section in which electric equipment is housed and in which gas for insulating the electric apparatus is sealed, and a gas sensor having electrodes to which voltage is applied and detecting the amount of gas decomposed in the gas section is provided. The output of the gas sensor is corrected in accordance with the cumulative voltage application time to the gas sensor. The correction of the output of the gas sensor is performed by a signal processing device connected to the output side of the gas sensor so as to compensate for the decrease in the detection sensitivity of the gas sensor due to the cumulative voltage application time to the gas sensor.

Further, a gas section in which electric equipment is housed and in which gas for insulating the electric apparatus is sealed, and a gas sensor which has an electrode to which a voltage is applied and detects the amount of decomposed gas in the gas section is provided. The life of the gas sensor is determined by comparing the cumulative voltage application time to the gas sensor with a predetermined specified life time.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram showing a gas-insulated electric device with a decomposition gas detector according to Embodiment 1 of the present invention. In FIG. 1, 1a, 1b,
1c, 1d gas sections insulated gas such as SF ₆ is sealed, 2 envelope partitions the inside and the outside air in the gas segment 1 a to 1 d, 3a, 3b, 3c, 3d each gas segment 1a,
1b, 1c, 1d, spacers for partitioning adjacent gas sections, 4 is a center conductor supported at the center of the jacket 2 by spacers 3a to 3d, 5a is gas generated between the center conductor 4 and the jacket 2. Ground fault location inside category 1c, 5b is ground fault location 5.
The arcs generated in a, 6a, 6b, 6c and 6d are gas sensors for detecting the amount of decomposed gas inside the gas sections 1a, 1b, 1c and 1d, respectively, and 7 is a fault current detector. 16
Is a signal processing device that processes the output signals of the gas sensors 6a to 6d to determine the abnormality of the gas sections 1a to 1d or the abnormality of the gas sensors 6a to 6d, and 17 is a signal sent from a higher-level control protection system. A state monitor signal indicating an unsteady state such as short-circuit, short-circuit, cut-off, and the like; 18 is an equipment abnormality signal for notifying an upper-level control system of an equipment abnormality;
c and 19d are partial discharge detectors for detecting discharges in the gas sections 1a, 1b, 1c and 1d, respectively.

FIG. 2 is a diagram showing the secular change of the detection sensitivity of the gas sensor of the gas-insulated electric equipment with the decomposition gas detector according to the first embodiment of the present invention. In FIG. 2, reference numeral 21 denotes a secular change of the detection sensitivity. FIG. 3 is a diagram showing the secular change of the output level of the gas sensor of the gas-insulated electric device with the decomposition gas detector according to Embodiment 1 of the present invention. In FIG. 3, reference numeral 22a denotes an output level of the gas sensor when the age is small, 22b denotes an output level of the gas sensor when the age is long, and 23 denotes an internal abnormality detection level.

Next, the operation of the gas-insulated electrical equipment with a decomposition gas detector according to Embodiment 1 will be described. The sensitivity of the gas sensors 6a to 6d of the gas insulated equipment of FIG. 1 for detecting the decomposed gas decreases with the lapse of years as shown in the secular change 21 of the detection sensitivity in FIG. In addition, since a plurality of gas sensors are generally attached to a gas-insulated electric device at the same time, all the gas sensors deteriorate over time to the same extent. Therefore, in the first embodiment, the gas sensors 6a to 6a
Under conditions where 6d has been exposed to an insulating gas atmosphere for many years,
When an accident such as a ground fault occurs inside the gas sections 1a to 1d, the output data of the gas sensors 6a to 6d are statistically processed and their relative calculations are performed to prevent the possibility of detecting the accident. Based on the results, a first pass / fail judgment criterion, which is a criterion for judging an abnormality in the gas division, is created, and the pass / fail judgment of the gas divisions 1a to 1d is made based on the first judgment criteria. If a plurality of gas sensors are not installed at the same time, for example, if only one gas sensor has been installed for a long time, the signal processor 16 determines whether the decrease in the output level of the gas sensor falls below a predetermined value. Pass / fail is determined.

For example, a ground fault occurs inside the gas section 1c when the mounting years of the gas sensor 6c are short, and a ground fault occurs within the gas section 1c when the mounting years of the gas sensor 6c are long. The output level of the gas sensor 6c in the event of occurrence of is different as shown by the output levels 22a and 22b in FIG. As is apparent from FIG. 3, the output level 22a exceeds the internal abnormality detection level 23, so that the control processor 8 determines that the internal abnormality is present in the conventional apparatus. Since the level does not exceed level 23, in the conventional device, the control arithmetic unit 8 cannot determine that the internal abnormality has occurred, and the internal abnormality is overlooked.

Next, FIG. 1 showing Embodiment 1 of the present invention
In the following, for example, a method of detecting an internal abnormality when a ground fault occurs in the gas section 1c will be described. First, the output data of the gas sensors 6a to 6d is taken into the signal processing device 16 under the condition that no internal accident such as a ground fault occurs, and the average value Χ and the standard deviation σ are calculated. In order to capture the output data of the gas sensors 6a to 6d under conditions in which no internal accident has occurred, a mask for detecting the function of the gas sensor when a decomposed gas is generated due to an arc such as a ground fault, a short circuit, or an interruption, and a partial discharge The signal processor 16 performs the mask of the detection function of the gas sensor when the decomposed gas is generated due to the above, using the output of the state monitor signal 17 and the outputs of the partial discharge detectors 19a to 19d, and then fetches the output data.
The acquisition of the output data for calculating the average value Χ and the standard deviation σ is periodically performed, for example, once every six months, so that the adverse effects due to the secular change of the detection sensitivity of the gas sensors 6a to 6d are excluded. Reliability can be improved.

Next, a method of determining an internal abnormality based on the average value Χ and the standard deviation σ obtained from the output data of the gas sensors 6a to 6d will be described below. If no abnormality such as ground fault, short circuit or partial discharge has occurred in the gas sections 1a to 1d, the gas sensor 6
The measurement results of the output data of a to 6d are Χ−2σ to Χ + 2
Since there is almost no probability of exceeding σ, if 仮 +
If it exceeds 2σ or Χ + 3σ, it can be determined that an abnormality such as a ground fault, a short circuit, or a partial discharge has occurred therein. Therefore, these are used as an internal abnormality detection level, that is, a pass / fail judgment criterion.

A specific abnormality judging method is, for example, when the output data of any of the gas sensors 6a to 6d exceeds the judgment level Χ + 2σ and does not exceed the judgment level Χ + 3σ, it is regarded as an abnormality of the caution level and the signal processing is performed. A warning signal is sent to a higher-level control system based on the device abnormality signal 18 of the device 16, and if the output data exceeds the determination level Χ + 3σ,
In order to regard the alarm level as abnormal and perform an accident process or an improvement process, the device abnormal signal 18 of the signal processing device 16
An alarm signal is sent to the upper control system.

According to the first embodiment, the gas sensors 6a to 6a
Rather than comparing the output data of the gas sensors 6a with the absolute determination criteria to determine the abnormality of the gas sections 1a to 1d, the relative pass / fail determination criteria statistically calculated based on the output data of the gas sensors 6a to 6d In comparison, by judging the abnormality of the gas sections 1a to 1d, it is possible to eliminate the influence of the deterioration of the detection sensitivity of the gas sensors 6a to 6d over time, thereby improving the reliability of the abnormality detection of the gas sections 1a to 1d. This has the effect.

Embodiment 2 FIG. FIG. 4 is a diagram showing a gas-insulated electric device with a decomposition gas detector according to Embodiment 2 of the present invention. In FIG. 4, reference numeral 1 denotes a gas section in which an insulating gas such as SF ₆ is sealed, 2 denotes a jacket that separates the inside and the outside in the gas section 1, 3a and 3b denote spacers that partition the gas section 1, and 4 denotes spacers 3a and 3b. A center conductor 6e, 6f, 6g, 6h supported by a central portion of the jacket 2 by a gas sensor for detecting the amount of decomposed gas in each portion inside the gas section 1;
7 is a fault current detector, 16 is a signal processing device that processes the output signals of the gas sensors 6e to 6h to determine the abnormality of the gas class 1 or the abnormality of the gas sensors 6e to 6h, and 17 is sent from a higher control protection system. Incoming signal, ground fault, short circuit,
A state monitor signal 18 representing an unsteady state such as interruption is a device abnormality signal for notifying an upper-level control system of a device abnormality. Reference numeral 19 denotes a partial discharge detector for detecting the discharge of the gas section 1.

Next, the operation of the gas-insulated electrical equipment with a decomposition gas detector according to Embodiment 2 of the present invention will be described. In the second embodiment, a plurality of gas sensors 6e to 6h
Of these, a failed gas sensor is determined.
First, under conditions where internal accidents such as ground faults have not occurred,
The output data of the gas sensors 6e to 6h is converted to a signal processing device 16
, And statistically processed to calculate a second pass / fail criterion, which is a criterion for determining a failure of the gas sensor. The average value Χ and the standard deviation σ are calculated as the pass / fail judgment criteria.
In addition, under the condition that no internal accident has occurred, the gas sensor 6
In order to capture the output data of e to 6h, a mask for detecting a gas sensor when a decomposed gas is generated due to an arc such as a ground fault, a short circuit, or an interruption, and a detecting function for a gas sensor when a decomposed gas is generated due to a partial discharge. Is performed by the signal processing device 16 using the output of the state monitor signal 17 and the output of the partial discharge detector 19, and the output data is captured.

The output data for calculating the average value Χ and the standard deviation σ are taken in periodically, for example, once every six months, so that adverse effects due to aging of the detection sensitivity of the gas sensors 6e to 6h are excluded. And the reliability of the measurement can be increased.

A method of determining a pass / fail judgment criterion based on the average value Χ and the standard deviation σ obtained from the output data of the gas sensors 6e to 6h, and a method of judging a failure of the gas sensors 6e to 6h based on the criterion will be described below. If a ground fault occurs inside gas division 1,
When no abnormality such as a short circuit or partial discharge has occurred, the decomposition gas distribution inside the gas division 1 is almost constant.
The measurement result of the output data of the gas sensors 6e to 6h is Δ +
Definitely hardly exceeds 2σ or Χ + 3σ,
If it exceeds Χ + 2σ or Χ + 3σ, it can be determined that one of the gas sensors 6e to 6h has failed. Therefore, these are used as an internal abnormality detection level, that is, a pass / fail judgment criterion.

A specific failure determination method is, for example, when the output data of any of the gas sensors 6e to 6h exceeds the determination level Χ + 2σ and does not exceed the determination level Χ + 3σ, it is regarded as a failure of a caution level and the signal processing device A warning signal is sent to a higher-level control system based on the 16 device abnormality signals 18 and if the output data exceeds the determination level 判定 + 3σ,
An alarm signal is sent to a higher-level control system based on the device abnormality signal 18 of the signal processing device 16 in order to regard the failure as an alarm level and perform a failure treatment.

According to the second embodiment, the gas sensors 6e to 6e
The failure of the gas sensors 6e to 6h can be determined by comparing with a relative pass / fail determination criterion statistically calculated based on the output data of 6h, and there is no need to remove and inspect the gas sensors 6e to 6h. In addition to improving the efficiency of the inspection work of the gas sensors 6e to 6h, the gas sensors 6e to 6h
This has the effect of improving the reliability of the device.

Embodiment 3 FIG. 5 is a configuration diagram showing a gas-insulated electric device with a decomposition gas detector according to Embodiment 3 of the present invention. In FIG. 5, 1 is a gas section in which an insulating gas such as SF ₆ is sealed, 2 is a jacket that separates the outside air and the interior in the gas section 1, 3a and 3b are spacers that respectively separate the gas section 1 and an adjacent gas section, 4 is a spacer 3a, 3
a central conductor supported by b in the center of gas section 1;
Reference numeral 6 denotes a gas sensor for detecting the amount of decomposed gas in the gas section 1, and an electrode to which a voltage is applied is arranged in the gas section to detect the amount of decomposed gas. Reference numeral 10 denotes a current interrupting unit that is electrically connected to the center conductor 4 and interrupts current.
Reference numeral 1 denotes an arc generated when the current is interrupted by the current interrupting unit 10, 16 denotes a signal processing device that processes an output signal of the gas sensor 6, and 17 denotes a state of the gas-insulated electric device input to the signal processing device 16. The monitor signal 18 is a device abnormality signal for notifying the occurrence of an internal abnormality in the gas section 1 to the upper system protection system. Reference numeral 25 denotes a voltage application time integrating device for calculating a cumulative voltage application time to the gas sensor 6, and 26 denotes an electric wire connected so that a voltage is input from a higher-order measurement system. In addition, the gas sensor 6 that detects the amount of decomposed gas by applying a voltage to the electrode has, for example, a structure in which an ion-conductive solid electrolyte is arranged between the first and second porous electrodes that are in contact with the gas, There is a gas sensor that detects a gas concentration by applying a DC voltage to the first and second porous electrodes and measuring a current generated by the movement of ions between the electrodes.

FIG. 6 is a diagram showing gas sensor detection sensitivity characteristics of a gas-insulated electric device with a decomposition gas detector according to Embodiment 3 of the present invention. In FIG. 6, reference numeral 27 denotes a detection sensitivity characteristic of the gas sensor that changes according to the voltage application cumulative time. FIG. 7 is a diagram showing a change in a gas sensor output level according to a cumulative voltage application time of a gas-insulated electric device with a decomposition gas detector according to Embodiment 3 of the present invention. In FIG. 7, 23 is an internal abnormality detection level, 28a is the output level of the gas sensor when the voltage application cumulative time is short, 28b
Is the output level of the gas sensor when the voltage application cumulative time is long. FIG. 8 is a diagram showing an amplification gain characteristic of a gas-insulated electric device with a decomposition gas detector according to Embodiment 3 of the present invention. In FIG. 8, reference numeral 29 denotes a gain characteristic that changes according to the cumulative voltage application time.

Next, the operation of the gas-insulated electric device according to the third embodiment will be described. In general, when an internal abnormality such as a partial discharge or a ground fault occurs in the gas section 1, the insulating gas is decomposed to generate a decomposed gas. Since the insulation performance and the current interruption performance are reduced, the amount of the decomposed gas is regularly monitored by the gas sensor 6 as a preventive maintenance of the gas-insulated electric device. When measuring the amount of the decomposed gas existing in the gas section 1 in FIG. 5, a voltage is applied from the upper measurement system to the gas sensor 6 from the electric wire 26 via the voltage application time integrating device 25, and the output from the gas sensor 6 is output. Is a signal processing device 1
If the value is larger than the internal abnormality detection level 23, it is determined that an internal abnormality has occurred in the gas-insulated electric device. The detection sensitivity of the gas sensor 6 decreases as the cumulative time of voltage application to the gas sensor 6 increases, as shown in FIG. As is clear from FIG. 7, the output level 28a when the cumulative voltage application time is short exceeds the internal abnormality detection level 23, so that the signal processor determines that the internal abnormality has occurred. Output level 2
In 8b, since the internal abnormality detection level 23 is not exceeded, the signal processing device cannot determine that the internal abnormality has occurred, and the internal abnormality is overlooked.

Next, an operation for correcting a decrease in detection sensitivity will be described. The detection sensitivity of the gas sensor 6 decreases as the voltage application cumulative time increases, as shown by the detection sensitivity characteristic 27 in FIG. 6, but in order to compensate for this decrease in detection sensitivity, it is inversely proportional to the reduction characteristic. 8 are recorded in the memory of the signal processing device 16. Further, every time the decomposition gas amount is measured, a voltage is applied to the gas sensor 6,
The voltage application cumulative time is measured by the voltage application time integrating device 25.

When measuring the amount of decomposed gas at a certain time, the voltage application cumulative time at that time is calculated by the voltage application time integrating device 25.
The information on the accumulated voltage application time is sent to the signal processing device 16, and the signal processing device 16 determines the optimum amplification gain based on the accumulated time, for example, in a gain characteristic 29 as shown in FIG. Required from. Therefore, the cumulative time of voltage application to the gas sensor 6 increases, and the gas sensor 6
Even if the detection sensitivity of the
Compensates for the detection sensitivity, the same detection sensitivity as that of the gas sensor 6 with a short cumulative voltage application time can be obtained even when a gas sensor 6 with an increased cumulative voltage application time to the gas sensor 6 is used. Can be detected.

According to the third embodiment, the degradation of the detection sensitivity accompanying the increase in the cumulative voltage application time of the gas sensor 6 is automatically corrected to measure the amount of the decomposed gas. There is an effect that accurate measurement without being affected can be performed, and reliability of detection of an internal abnormality of the gas section 1 using the measurement result is improved.

Embodiment 4 Since the fourth embodiment has the same configuration as the third embodiment, its operation will be described with reference to FIG. As the cumulative voltage application time to the gas sensor 6 gradually increases, the detection sensitivity gradually decreases, and there is a point at which the correction by the amplification gain of the signal processing device 16 cannot cope with, that is, the life of the gas sensor 6. The determination of the life of the gas sensor 6 is performed by a voltage application time integrating device 25.
By comparing the cumulative voltage application time and the specified life time obtained in the above with the determination circuit inside the signal processing device 16, the necessity of replacement of the gas sensor 6 is notified to the upper control system as the device abnormality signal 18.

According to the fourth embodiment, the cumulative voltage application time of the gas sensor 6 is counted by the voltage application time integrating device 25, and the counted result is compared with the specified lifetime recorded in the signal processing device 16. There is an effect that the life determination of the gas sensor 6, that is, the necessity of replacement can be determined.

[0041]

Since the present invention is configured as described above, it has the following effects. Along with the electric equipment being housed, a plurality of gas sections each filled with a gas that insulates the electric apparatus, and a plurality of gas sensors for detecting the amount of decomposed gas of the gas in each gas section,
Periodically using the outputs of the plurality of gas sensors, a first pass / fail criterion, which is a criterion for determining an abnormality in the gas classification, is calculated, and the output of each gas sensor is used to determine the gas classification based on the first pass / fail criterion. Since the abnormality is determined, it is possible to determine the abnormality of the gas classification without affecting the aging of the gas sensor.

Further, the electric equipment includes a gas section in which a gas for insulating the electric apparatus is sealed, and a plurality of gas sensors for detecting the amount of gas decomposed in the gas section. The second pass / fail judgment criterion for judging the failure of the gas sensor is calculated periodically using the output, and the failure of each gas sensor is judged based on the output of each gas sensor based on the second pass / fail judgment criterion. The failure of the gas sensor can be determined without removing and inspecting the gas sensor. Also, the pass / fail criterion is
Since the calculation is performed using the average value and the standard deviation of the outputs of the plurality of gas sensors, it is possible to use the ratio as a reasonable pass / fail determination criterion and to eliminate the influence of aging of the gas sensors.

Further, a gas section in which the electric equipment is housed and in which the gas for insulating the electric equipment is sealed, and a gas sensor having an electrode to which voltage is applied and detecting the amount of gas decomposed in the gas section are provided. Since the output of the gas sensor is corrected according to the cumulative time of voltage application to the electrodes, it is possible to correct a decrease in the detection sensitivity of the gas sensor due to the cumulative time of voltage application. In addition, the correction of the output of the gas sensor is performed by a signal processing device connected to the output side of the gas sensor so as to compensate for the decrease in the detection sensitivity of the gas sensor due to the cumulative time of voltage application to the gas sensor. can do.

A gas section in which the electric equipment is housed and in which a gas for insulating the electric equipment is sealed, and a gas sensor having electrodes to which voltage is applied and detecting the amount of gas decomposed in the gas section are provided. Since the life of the gas sensor is determined by comparing the cumulative time of voltage application to the electrode of the gas sensor with a predetermined life time set in advance, it is possible to take thorough measures such as replacement of the gas sensor.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a gas-insulated electric device with a decomposition gas detector according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing the secular change of the gas sensor detection sensitivity of the gas-insulated electric device with the decomposition gas detection device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a secular change of an output level of a gas sensor of the gas-insulated electric device with a decomposition gas detection device according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram showing a gas-insulated electric device with a decomposition gas detector according to Embodiment 2 of the present invention.

FIG. 5 is a configuration diagram showing a gas-insulated electric device with a decomposition gas detection device according to Embodiments 3 and 4 of the present invention.

FIG. 6 is a diagram showing gas sensor detection sensitivity characteristics of a gas-insulated electric device with a decomposition gas detector according to Embodiment 3 of the present invention.

FIG. 7 is a diagram showing a change in an output level of a gas sensor according to a cumulative voltage application time of a gas-insulated electric device with a decomposition gas detection device according to a third embodiment of the present invention.

FIG. 8 is a diagram showing an amplification gain characteristic of a gas-insulated electric device with a decomposition gas detector according to Embodiment 3 of the present invention.

FIG. 9 is a configuration diagram illustrating a gas-insulated electric device including a conventional gas sensor.

FIG. 10 is a configuration diagram illustrating a gas-insulated electric device including a conventional gas sensor.

[Explanation of symbols]

1, 1a, 1b, 1c, 1d gas classification, 2 jacket,
3a, 3b, 3c, 3d spacer, 4 center conductor,
5a Ground fault location, 5b, 11 arc, 6, 6a, 6
b, 6c, 6d, 6e, 6f, 6g, 6h Gas sensor, 7 Fault current detector, 10 Current cutoff section, 13
Gas sensor output signal, 14 gas sensor control signal,
16 signal processing device, 17 status monitor signal, 18
Equipment abnormality signal, 19, 19a, 19b, 19c, 19d
Partial discharge detector, 21 Secular change of detection sensitivity, 22
a, 22b, 28a, 28b output level, 23 internal abnormality detection level, 25 voltage application time integrating device, 26
Wire, 27 detection sensitivity characteristics, 29 gain characteristics.

Claims (6)

[Claims] An electric device is housed, and a plurality of gas sections each of which is filled with a gas for insulating the electric apparatus, and a plurality of gas sensors for detecting a decomposition gas amount of the gas in each gas section, Periodically using the outputs of the plurality of gas sensors, a first pass / fail judgment criterion that is a criterion for judging an abnormality in the gas classification is calculated, and the output of each gas sensor based on the first pass / fail judgment criterion is calculated. A gas-insulated electrical device characterized in that an abnormality in a gas classification is determined by the method. 2. The gas sensor according to claim 1, further comprising: a gas section in which the electric device is housed and in which a gas for insulating the electric device is sealed; and a plurality of gas sensors for detecting an amount of decomposed gas in the gas section. Periodically using the output of
A second pass / fail criterion, which is a criterion for determining a failure of the gas sensor, is calculated, and a failure of each gas sensor is determined based on an output of each of the gas sensors based on the second pass / fail criterion. Gas insulated electrical equipment. 3. The gas-insulated electric device according to claim 1, wherein the pass / fail judgment criterion is calculated using an average value and a standard deviation of outputs of the plurality of gas sensors. 4. A gas sensor containing an electric device and having a gas section filled with a gas for insulating the electric apparatus, an electrode to which a voltage is applied, and a gas sensor for detecting a decomposition gas amount of the gas in the gas section. And the output of the gas sensor is
A gas-insulated electric device, wherein the correction is performed in accordance with the cumulative time of voltage application to the electrode. 5. The correction of the output of the gas sensor is performed by a signal processing device connected to the output side of the gas sensor so as to compensate for the decrease in the detection sensitivity of the gas sensor due to the cumulative time of voltage application to the gas sensor. The gas-insulated electric device according to claim 4, wherein 6. A gas sensor in which an electric device is housed and which has a gas section filled with a gas for insulating the electric apparatus and an electrode to which a voltage is applied, and which detects an amount of gas decomposed in the gas section. Wherein the gas sensor is configured to determine the life thereof by comparing a cumulative voltage application time to the electrode with a predetermined specified life time.