JPH07241009A - Gas pressure monitor of gas insulated apparatus - Google Patents

Abstract

PURPOSE:To decide the cause of the fluctuation of a gas pressure in each gas section of a gas insulated apparatus accurately and quickly by a method wherein, in order to monitor the gas pressure, it is converted into a pressure at a predetermined temperature in accordance with a gas temperature detection signal. CONSTITUTION:A gas pressure sensor 73 measures gas pressures in a plurality of the gas sections S1 and S2 of a gas insulated apparatus which are divided by insulating spacers 10 and outputs gas pressure signals. A gas temperature detection unit is provided in the gas pressure sensor 73 and measures the gas temperatures in the respective gas sections S1 and S2 and outputs gas temperature signals. In order to monitor the gas pressures in the respective sections S1 and S2 in accordance with the gas pressure signals from the gas pressure sensor 73, the gas pressures are converted into the pressures at a predetermined temperature in accordance with the gas temperature signals from the gas temperature detection unit. If the gas pressure fluctuates by a cause such as a temperature change, a leakage and an internal failure at that time, the fluctuation is transmitted to the gas pressure sensor 73. With this constitution, the cause of the fluctuation of the gas pressure can be decided acculately and quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a preventive maintenance system applied to confirm and monitor the reliability of equipment in a gas-insulated equipment in which a charging section is compactly housed in a grounded metal container filled with insulating gas. The present invention relates to a gas pressure monitoring device used.

[0002]

2. Description of the Related Art In recent years, the amount of power supply in urban areas has been increasing. In addition, it is becoming increasingly difficult to secure a site for substation equipment due to soaring land prices. Under such circumstances, a gas-insulated device excellent in environmental resistance and compactness is indispensable for enhancing substation equipment.

This gas-insulated device uses an insulating gas such as SF ₆ gas which is excellent in insulation and arc extinguishing property,
This is a device in which substation equipment such as a circuit breaker is housed and arranged in a sealed grounded metal container. Here, an example of a typical gas insulation device will be specifically described with reference to the layout diagram shown in FIG. 7.

In FIG. 7, reference numeral 1 denotes a pressure-resistant metal container at ground potential, which is generally called a ground metal container. In this grounded metal container 1, a lightning arrester 2, a transformer 3, a grounding switch 4, a disconnector 5, a current transformer 6, a circuit breaker 7 and a busbar 8 are housed as a voltage applying section. Further, an insulating gas 9 such as SF ₆ is enclosed in the ground metal container 1, and the ground metal container 1 and the power applying unit are electrically insulated by this insulating gas 9.

On the other hand, in the grounded metal container 1, insulating spacers 10a to 10d for supporting the busbars 8 are provided at appropriate intervals, and these insulating spacers 10a are provided.
The mechanical strength and dielectric strength of the bus bar 8 are maintained by 10d. In addition, each insulating spacer 10a-10d,
The space in the grounded metal container 1 is arranged so as to be airtightly separated from each other for maintenance and separation.
That is, the space inside the grounded metal container 1 is
It is divided into a plurality of gas compartments by 0a to 10d, and the insulating gas 9 is enclosed in each gas compartment. In addition, 1 in the figure
Reference numeral 1 denotes a gas cylinder, and each gas compartment in the grounded metal container 1 is filled with gas from the gas cylinder 11 via a gas cubicle 12 and a valve 13. Of these, the gas cubicle 12 also has a function of detecting the pressure of each gas compartment.

Further, in FIG. 7, the main circuit is connected to a transformer 19 via a disconnector 5 and a circuit breaker 7 and a bushing 14. Although FIG. 7 shows a single-line power receiving main circuit, power is supplied from the power receiving main circuit (not shown) on the right side of the power receiving main circuit to the transformer 19 via the disconnector 5. In some cases.

Further, reference numeral 15 in the drawing denotes a switchboard, and switches (switch disconnector 5, circuit breaker 7,
It has a function of giving an urging signal to each operation device 17 of the earthing switch 4) to control switching of the main circuits of the switches and interruption operation. Further, reference numeral 18 in the drawing denotes a compressor facility that serves as a drive source for the switches. A predetermined pressure (for example, generally 15 kg / cm ² ) obtained by the compressor equipment 18 is applied to each operation device 17 via the operation cubicle 16.
And the switches are operated.

The gas-insulated equipment having the above structure has the following advantages. That is, due to the excellent characteristics of the insulating gas 9, the storage device can be downsized, and the entire device can be downsized. In other words, KV
The occupied volume per A is reduced, and the effective use of the installation site becomes possible. At the same time, using the gas busbar, 2 to 3 steps
Since a stacked structure of stages can be achieved and block stacking can be achieved, a large volume can be achieved with a small area.

Further, since the grounded metal container 1 is grounded, there is no fear of electric shock even if the grounded metal container 1 is approached during charging. In addition, since the electricity applying section is housed in the grounded metal container 1, it is not directly exposed to salt damage, wind damage and the like. Therefore, there is no fear of deterioration due to external factors, and environmental resistance is high. Moreover, since various switches are subjected to arc treatment in SF ₆ gas having a high arc extinguishing ability, the breaking capacity per main contact can be significantly improved.

However, while the gas-insulated equipment as shown in FIG. 7 has the above advantages, it also has the following drawbacks. That is, as a result of downsizing the gas-insulated equipment as a whole, the size of the rotating work or the reassembling work is limited to a small size during maintenance and inspection of the storage equipment. Therefore, it takes a long time to perform maintenance / inspection work on the storage equipment, and work efficiency is significantly reduced.

Further, since the insulating gas 9 enclosed in the grounded metal container 1 is expensive, the manufacturing technique for preventing gas leakage to the outside is high-grade, and because of good insulation, kv /
Since mm is large and the gas pressure drop reacts extremely sensitively to the insulation tolerance, it is required to complete an emergency repair system for gas leaks. Furthermore, in replacement work due to the exhaustion of the main contacts of various switchgear, it takes a lot of time to recover and refill the insulating gas, which makes the gas insulation device downtime longer and hinders stable power supply. It also has the drawback of coming.

As explained above, the gas-insulated equipment includes
Not only the advantages, but also some drawbacks. However, since the performance advantages of the gas insulation device are sufficient even if the drawbacks are compensated for, the gas insulation device has been remarkably popularized recently, and the number of installation locations has increased, and a mass production system has come to be adopted. As a result, the gas-insulated equipment is required to have higher reliability, and the maintenance of the equipment, preparation for the emergency repair system, and the variation in quality have become problems that cannot be ignored.

As a countermeasure against the above-mentioned problems in gas-insulated equipment, it has been earnestly desired to establish a preventive maintenance system capable of confirming the reliability that the operating condition is normal and enabling early detection and monitoring when an abnormality occurs. There is. It is expected that the introduction of this preventive maintenance system will prevent accidents of gas-insulated equipment in order to provide stable power supply and at the same time minimize economic loss due to the accident.

As an example of such a preventive maintenance system, a gas pressure monitoring device has been conventionally proposed. A gas pressure monitoring device is a device that uses a gas pressure sensor to monitor fluctuations in gas pressure in a gas compartment of a gas insulation device.

According to such a gas pressure monitor, a gas leak, an internal ground fault, which cannot be visually detected,
When a defect in the grounded metal container such as a defective internal contact occurs, it can be quickly detected and an accident can be prevented. Moreover, since it is possible to monitor the gas pressures of all the gas compartments by this device, there is no need for inspection work for inspection, and there is an advantage that it is also useful for labor saving.

FIG. 8 shows the configuration of the gas pressure sensor used in the above-described gas pressure monitoring device. As shown in FIG. 8, the gas pressure sensor 41 includes the case 2
It is configured within 1. That is, first, this case 2
A gas pipe 70 filled with gas is drawn out from the inside of 1, and its tip (not shown) is connected to a grounded metal container of the gas insulated device. Further, a liquid chamber 24 is provided at a base end portion inside the case 21 of the gas pipe 70 via a partition film 23 having elasticity, and the partition film 23 allows the gas and the liquid chamber in the gas pipe 70 to be separated from each other. It is separated from the liquid such as oil in 24.

A diaphragm 25 made of stainless steel or the like is provided on the opposite side of the partition film 23 in the liquid chamber 24.
A piezoresistive element 26 that converts strain of the diaphragm 25 into a resistance change amount is attached to the outer surface of the liquid chamber 24 of the diaphragm 25. A resistance element 27 is connected to the piezoresistive element 26,
The piezoresistive element 26 and the resistive element 27 form a bridge circuit.

An electronic circuit 28 for amplifying the signal and an output signal line 30 are sequentially connected to the bridge circuit. The output signal line 30 is drawn out of the case 21 and connected to a monitoring means (not shown). Also,
In the figure, 29 is a power supply circuit that supplies power to the electronic circuit 28, and 31 is a power supply line.

In the gas pressure sensor 41 of FIG. 8 constructed as above, when the pressure of the insulating gas in the grounded metal container of the gas insulating device changes and the gas pressure in the gas pipe 70 changes, the partition film 23 , The liquid in the liquid chamber 24, and the piezoresistive element 26 via the diaphragm 25.
Then, it is output from the piezoresistive element 26 to the electronic circuit 28 via the resistive element 27. The electronic circuit 28 transmits the pressure change as an electric output signal to the monitoring means. Thus, when the pressure of the insulating gas changes, the output signal of the gas pressure sensor 41 changes.

By the way, it can be presumed that the cause of the change in pressure of the insulating gas in the grounded metal container of the gas insulated device is as follows.

(1) Change in gas temperature due to solar radiation, etc. (2) Change in heat generation amount due to fluctuation in energization current (3) Occurrence of gas leak (4) Change in heat generation amount due to energization abnormality such as poor contact (5) Occurrence of internal ground fault

Here, the causes (1) and (2) are fluctuations in the gas pressure that occur when the gas insulation device itself has no problem (healthy state), and the gas pressure in a specific gas compartment is It should be clearly distinguished from (3) to (5) which fluctuate. In order to make this distinction, conventionally, a gas pressure variation of the internal gas in each gas compartment is converted by a method of converting the gas pressure into a pressure at a predetermined temperature such as 20 ° C. for each gas compartment (temperature conversion). It was possible to monitor.
This compares the other gas compartments with the normal gas compartments and the gas compartments in which the abnormalities (3) to (5) have occurred.

In order to convert the temperature for determining the cause of such an abnormality, it is necessary to measure the gas temperature together with the gas pressure. Here, since the gas insulation device has a plurality of gas compartments, it is considered that the optimal method is to measure the gas temperature of each gas compartment. However, this means that a gas temperature detecting means is attached to each gas compartment,
Its installation property and maintainability are problems. Therefore, in the conventional gas pressure monitoring device for gas insulation equipment, a temperature detecting unit for measuring the outside air temperature (the temperature outside the grounded metal container) is provided at one or more places, and this measured value is used for conversion of all gas compartments. It was gas temperature.

The temperature detector 45 as described above is connected to the monitoring means together with the gas pressure sensor 41. The monitoring means, as shown in FIG. 9, includes the gas pressure sensors 41a to 41a.
A first insulation converter 42a that converts the output signal from 41n into a pressure signal and a second insulation converter 42b that converts the output signal from the temperature detection unit 45 into a temperature signal are provided.
The first and second insulation converters 42a and 42b are connected to the same processing unit 43. This processing unit 43
It is configured to convert the measured value of the gas pressure into the gas pressure at a predetermined temperature from the pressure signal and the temperature signal.
A display unit 44 is connected to such a processing unit 43,
The processing result of the processing unit 43 is displayed.

As described above, by providing the gas pressure monitoring device consisting of the gas pressure sensor 41, the temperature detecting section 45 and the monitoring means, the fluctuation of the gas pressure in each gas compartment of the gas insulation equipment is monitored and the gas pressure is monitored. The cause of the change in is determined.

[0026]

However, the conventional gas pressure monitoring device for gas insulation equipment has the following problems. That is, a temperature difference occurs in each gas compartment depending on the conditions such as the installation location of the gas insulation device. On the other hand, the temperature detection unit is located at one or more locations outside the grounded switch, and a gas section in which the difference between the measured value and the actual gas temperature is greatly deviated is also generated. Further, when the temperature detection unit that detects the outside air temperature is affected by solar radiation or the like, a temperature difference from the actual gas temperature occurs. As described above, the outside air temperature cannot be said to be appropriate as the conversion gas temperature, and it has been difficult to accurately determine the cause of the gas pressure fluctuation in the gas compartment with the conversion pressure thus obtained.

The present invention has been proposed in order to solve the above-mentioned drawbacks of the prior art, and its object is to accurately convert the gas pressure of each gas compartment into a temperature.
It is an object of the present invention to provide a gas pressure monitoring device for a gas insulation device, which can accurately and quickly determine the cause of gas pressure fluctuations. In particular, it is important to measure the gas temperature accurately, which makes it possible to easily measure the gas temperature in each gas compartment, reduce the load on the means for temperature conversion, and further reduce the size. An object of the present invention is to provide a gas pressure monitoring device for a gas insulation device that enables the gas pressure.

[0028]

According to the present invention, a plurality of gas compartments partitioned by insulating spacers are provided in a gas insulating device in which a high-voltage conductor is housed in a ground metal container in which an insulating gas is sealed. A gas pressure sensor that measures the gas pressure in the gas compartment and outputs a gas pressure signal is arranged in the gas compartment. Based on the gas pressure signal from the gas pressure sensor, the gas pressure in each gas compartment of the gas-insulated equipment is determined. In a gas pressure monitoring device for a gas insulating device to be monitored, at least one of the gas compartments is provided with gas temperature detecting means for measuring a gas temperature in the gas compartment and outputting a gas temperature signal. The gas pressure based on the gas pressure signal is monitored and converted into a pressure of a predetermined temperature based on the gas temperature signal.

Such a gas temperature detecting means can be provided in all gas sections of the gas insulating device. In this case, the gas temperature signals of the same gas section can be converted into a pressure of a predetermined temperature for monitoring. Also,
For each gas compartment group consisting of a plurality of gas compartments, a signal consisting of the average value of the gas temperature of the gas compartment group or the gas temperature of the specific gas compartment of the gas compartment group may be used. In such a gas pressure monitoring device for gas insulation equipment, the gas temperature detecting means may be provided in the same case as the gas sensor.

[0030]

The operation of the present invention having the above construction is as follows. That is, in the present invention, the gas pressure in the gas compartment is converted into a pressure (conversion pressure) at a predetermined temperature based on the gas temperature in the gas compartment. At this time, if the gas pressure fluctuates in the gas compartment due to factors such as temperature changes, leaks, internal failures, etc., this fluctuation is transmitted to the gas pressure sensor. And confirm the fluctuation of the converted pressure due to this fluctuation,
From this result, the cause of the gas pressure fluctuation is determined. Here, in the present invention, since the gas temperature is configured to directly measure the temperature of the gas, the solar temperature or the like does not directly affect the gas temperature detection means, and an accurate measured value of the gas temperature can be obtained. As a result, an accurate converted pressure is calculated.

In particular, the gas temperature detecting means is provided for each gas section, and the gas pressure is converted into the converted pressure by the gas temperature signal of the same gas section, so that the gas pressure of each gas section is highly reliable. Can be monitored at.

Further, when the signal composed of the average value of the gas temperature of all the gas compartments is used as the gas temperature signal, the load of the converted pressure calculating means can be reduced and the apparatus The size can be reduced. Further, as the gas temperature signal, a signal composed of the average value of the gas temperature of the gas partition group or the gas temperature of the specific gas partition of the gas partition group is used for each gas partition group composed of a plurality of gas partitions. In this case, it is suitable for gas-insulated equipment such as large-scale substations where the gas temperature is different in the distant gas section, reducing the load of the conversion pressure calculation means and providing a more accurate conversion pressure. It is calculated.

Further, by disposing the gas temperature detecting means in the same case as the gas pressure sensor, the disposition becomes easy and the gas pressure and the gas temperature can be simultaneously measured.

[0034]

【Example】

(1) Main Examples Hereinafter, one example of the gas pressure monitoring device for a gas insulation device according to the present invention will be specifically described with reference to the drawings. In this case, FIG. 1 is a block diagram showing the present embodiment in which the gas pressure monitoring device according to the present invention is applied to a gas insulation device, and FIG. 2 shows an example of a gas pressure sensor used in the gas pressure monitoring device of the present embodiment. FIG. 3 is a block diagram showing the configuration of the gas pressure monitoring apparatus of this embodiment, FIG. 4 is a graph showing gas pressure fluctuations during normal operation, and FIG. 5 is a graph showing gas pressure fluctuations during gas leak. The gas pressure monitoring apparatus according to the present embodiment is described as being applied to the general gas insulation device shown in FIG. 7, and the same members as those in the conventional art are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, as shown in FIG. 1, the main busbar portion of the gas-insulated equipment is enclosed in the grounded metal container 1, the busbar 8 housed in the grounded metal container 1, and the grounded metal container 1. Insulating gas such as SF ₆ gas 9 and bus 8
It is composed of an insulating spacer 10 for supporting. The inside of the grounded metal container 1 has the insulating spacer 1
Each of the gas sections S1, S2, ... Is divided by 0. A storage box 72 is arranged near each of the gas compartments S1, S2, ... And a gas pressure sensor 73 is arranged in the storage box 72. Note that, in FIG. 1, only the gas pressure sensor 73 provided in the gas section S1 will be described. Gas compartment S1 and gas pressure sensor 7
3 is connected to the gas pipe 70 via a gas valve 71.

As such a gas pressure sensor 73,
Specifically, a gas pressure sensor as shown in FIG. 2 is used. That is, from the inside of the case 21, the gas pipe 70 filled with gas is drawn out to the outside. Also,
A liquid chamber 24 is disposed at a base end portion inside the case 21 of the gas pipe 70 via a partition film 23, and the partition film 23 allows the gas in the gas pipe 70 and the liquid such as oil in the liquid chamber 24 to be separated. And are divided. Partition film 23 in liquid chamber 24
A diaphragm 25 is disposed on the opposite side of the diaphragm 25, and a bridge circuit including a piezoresistive element 26 and a resistive element 27 is connected to the outer surface of the liquid chamber 24 of the diaphragm 25. Then, the electronic circuit 28 and the output signal line 3 are connected to the bridge circuit.
0s are sequentially connected and are connected to a monitoring means (not shown).

Further, the partition membrane 23 has a gas pipe 70.
A gas temperature detection unit 32 is provided as a gas temperature detection unit inside. The gas temperature detector 32 is connected to an electronic circuit 28 that outputs the gas temperature together with the gas pressure as an electric signal.

As shown in FIG. 3, the gas pressure sensor 73 having the above-mentioned structure serves as a monitoring means, and the insulation converter 7 is used.
4, an upper processing system including a processing unit 75 and a display unit 76 is connected. The insulation converter 74 is configured to convert the output signal of the gas pressure and the gas temperature from each gas pressure sensor 73 into a pressure signal and a temperature signal, and send this to the processing unit 75. The processing unit 75 includes an insulation converter 74.
The pressure signal and the temperature signal of each gas section sent from the device are configured to convert the temperature into a gas pressure (converted pressure) at a preset predetermined temperature. Further, a judgment reference value is set in advance in the processing unit 75, and it is configured to compare this value with the converted pressure of each gas section. It should be noted that in a normal state where the gas insulation device itself has no problem, the gas pressure P measured by the gas pressure sensor 73 is
₀ and this converted gas pressure P ₁ show a characteristic waveform as shown in FIG. As shown in FIG. 4, the converted gas pressure P ₁
Indicates a constant value, and this value is used as the determination reference value by the processing unit 7.
It is entered in 5. In such a monitoring means, the measurement gas pressure, the measurement gas temperature, the converted pressure, the result of the comparison judgment, etc. input and processed in the processing unit 75 are configured to be displayed by the display unit 76 for each gas section. ing.

The operation of this embodiment having the above structure will be described. First, when an internal failure occurs in the gas section S1 of FIG. 1 and the gas pressure in the gas section S1 changes, the gas pressure in the gas pipe 70 also changes at the same time. As a result, the change in gas pressure is transmitted at the end of the gas pipe 70 of the gas pressure sensor 73. Then, this pressure change is transmitted through the partition film 23, the liquid in the liquid chamber 24, and the diaphragm 25 to the piezoresistive element 2.
It is transmitted to 6. Then, it is output from the piezoresistive element 26 to the electronic circuit 28 via the resistive element 27. On the other hand, the gas temperature detector 32 detects the gas temperature inside the gas compartment and outputs it to the electronic circuit 28. From the electronic circuit 28, the gas pressure and the gas temperature are the main signals,
It is transmitted to the monitoring means via the output signal line 30.

In the monitoring means, the output signals of the gas pressure and the gas temperature are simultaneously converted into the gas pressure signal and the gas temperature signal by the insulation converter 74, which are sent to the processing section 75. In the processing unit 75, for each gas section, a gas pressure signal indicates a pressure at a predetermined temperature (converted pressure) from the gas temperature signal.
Is converted to. Then, when the measured gas pressure changes and the converted pressure does not change compared with the determination reference value (when the graph is similar to that in FIG. 4), the fluctuation of the gas pressure is due to the gas temperature due to solar radiation or the like. Is caused by a change in the heat generation amount or a change in the heat generation amount due to a change in the energizing current, and it is determined that there is no problem in the gas-insulated equipment itself.

On the other hand, when the measured gas pressure fluctuates and the converted pressure also fluctuates with respect to the judgment reference value, a change in the heat generation amount due to the occurrence of a gas leak, a contact failure, or other energization abnormality, or an internal ground It is determined that the gas pressure in the gas compartment has changed due to the occurrence of a junction or the like. In particular, when a gas leak occurs, the amount of gas decreases with time, so the gas pressure also decreases in proportion. In this regard, the relationship between the gas pressure P ₀ and the converted gas pressure P ₁ has a waveform as shown in FIG. 5, and in the case of such a waveform, a gas leak is generated and processed in the processing unit. Furthermore, the converted pressure P
_{When 1} changes with respect to the determination reference value, it can be determined that a contact failure or an internal ground fault has occurred. Then, the determination by the processing unit is displayed on the display unit.

As described above, in the present embodiment, the gas pressure and the gas temperature are measured for each gas section to obtain the converted pressure, so that the fluctuation of the gas pressure is monitored for each gas section. You can In particular, the fluctuation can be easily monitored by comparing the converted pressure with the determination reference value. And if there is a change,
The cause of the fluctuation can be quickly determined. Moreover,
Since the gas temperature directly measures the temperature of the gas, it is possible to calculate an accurate converted pressure without causing a large temperature difference from the gas temperature due to the influence of solar radiation or the like unlike the outside air temperature in the conventional technique.

Further, in this embodiment, since the gas pressure and the gas temperature of each gas compartment are measured at the same time and processed in the same processing section, there is no difference in the measuring time of the gas pressure and the gas temperature, and the solar radiation is maintained. Even if there is an influence such as the above, an accurate converted pressure can be calculated. Then, since the gas pressure is converted for each gas section by the gas temperature of each gas section, the converted pressure can be accurately calculated even if there is a temperature difference in each gas section.

Moreover, in the present embodiment, the gas temperature detecting unit for measuring the gas temperature is provided in the gas pressure sensor for measuring the gas pressure, and at the same time, it is output to the same insulation converter. Therefore, it is not necessary to provide a gas temperature detecting means and an insulation converter therefor separately from the gas pressure sensor. Therefore, the arrangement can be facilitated and the size can be reduced, and the gas pressure monitoring device having more excellent function can be obtained.

(2) Other Embodiments The present invention is not limited to the above-mentioned embodiments, and the specific configurations of the gas pressure sensor and the monitoring means can be freely selected. Regarding the monitoring means, for example, the insulation converter is not limited to the configuration in which the output signal of the gas pressure and the output signal of the gas temperature are converted by the same insulation converter, and the first insulation converter for gas pressure signal conversion is used. It is also possible to provide a second insulation converter for gas temperature signal conversion. In addition, FIG.
, Each gas pressure sensor 7 without an insulation converter
Output signals of gas pressure and gas temperature from 3a to 73n,
The configuration may be such that the data is directly sent to the processing unit 75. In this case, in the processing unit 75, the main pressure signals of the gas pressure and the gas temperature are converted into the pressure signal and the temperature signal, and the converted pressure is obtained by this, or the direct conversion pressure is directly obtained from the main force signal of the gas pressure and the gas temperature. The configuration can be appropriately changed such as asking.

Further, in the present invention, the gas temperature detecting means for measuring the gas temperature is not limited to being provided in the gas pressure sensor 73 as the gas temperature detecting section 32, and it is possible to directly measure the gas temperature. The gas temperature detecting means may be directly provided in each gas compartment, or may be provided in a gas pipe connecting the gas compartment and the gas pressure sensor, and the like, and the like, can be appropriately changed.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the main bus bar portion of the gas insulation device has been described, but the present invention can be similarly applied to various gas insulation devices and is similarly excellent. It is possible to obtain the same effect.

Further, in the above-mentioned embodiment, the processing unit 75 of the monitoring means calculates the converted pressure of each gas compartment based on the gas temperature of each gas compartment. In the present invention, this is calculated as follows. It is possible to change. That is, since the gas temperature detecting means is arranged so as to directly measure the temperature of the gas, the gas temperature detecting means is not directly affected by solar radiation or the like. Therefore, it is also possible to obtain the average value of the gas temperatures of all the gas sections once and convert the gas pressure of each gas section by this value. Further, it is also possible to obtain a group average value of gas temperatures for each gas section group consisting of a plurality of gas sections and convert the gas pressure of each gas section of the group by this group average value. Further, in the gas section group, the gas temperature of the representative gas section may be measured, and this value may be used in each gas section of the gas section group. In this case, the gas temperature should be measured periodically for all gas compartments in the group, and if there is a gas compartment that is significantly different from other gas compartments, monitor it and display it on the display. It can also be configured.

With such a configuration, the gas pressure conversion processing work is simplified and the load is reduced. Therefore, it is possible to use a processing unit having a small processing capacity, and to reduce the size of the entire gas pressure monitoring device. Can be planned. In particular, in gas-insulated equipment such as large-scale substations, the gas temperature in different gas compartments may be different.In such a case, by using the group average value as the gas temperature, The load can be reduced and the converted pressure can be calculated more accurately. Therefore, it is possible to provide a small and excellent gas pressure monitoring device for a gas insulation device.

Further, in the present invention, the number of monitoring means is not limited to one, and a plurality of monitoring means may be provided. For example, in a gas-insulated device such as a large-scale substation, a gas section may be set as a monitoring section in plural units and a monitoring unit may be provided for each. In this case, an insulation converter is provided for each monitoring section and connected to one processing unit / display section, or an insulation converter and a processing section are provided for each monitoring section, and one display section is connected to this. In addition, it is also possible to provide an insulation converter, a processing unit, and a display unit for each monitoring section.

[0051]

As described above, according to the present invention, since the gas temperature in the gas compartment is directly measured, the gas pressure can be accurately converted into the pressure of the predetermined temperature by this temperature. Allows you to reliably monitor changes in gas pressure,
It is possible to provide a gas pressure monitoring device for a gas insulation device that accurately and easily determines the cause.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment in which a gas pressure monitoring device according to the present invention is applied to a gas insulation device.

FIG. 2 is a block diagram showing an example of the gas pressure sensor of FIG.

FIG. 3 is a block diagram showing the configuration of a gas pressure monitoring device.

FIG. 4 is a graph showing gas pressure fluctuations under normal conditions

FIG. 5 is a graph showing gas pressure fluctuation when a gas leak occurs.

FIG. 6 is a block diagram showing another embodiment.

FIG. 7 is a block diagram showing an example of a typical gas insulation device.

FIG. 8 is a configuration diagram showing a conventional gas pressure sensor.

FIG. 9 is a block diagram showing a configuration of a conventional gas pressure monitoring device.

[Explanation of symbols]

 1 ... Grounded metal container 8 ... Busbar 9 ... Insulating gas 10a-10d ... Insulating spacer 21 ... Case 23 ... Partition film 24 ... Liquid chamber 28 ... Electronic circuit 30 ... Output signal line 32 ... Gas temperature detector 41, 73 ... Gas pressure Sensor 42a ... 1st insulation converter 42b ... 2nd insulation converter 43, 75 ... Processing part 45 ... Temperature detection part 44, 76 ... Display part 70 ... Gas pipe 74 ... Insulation converter

Front page continuation (72) Inventor Shin Hasegawa 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki factory

Claims (6)

[Claims] 1. A plurality of gas compartments partitioned by insulating spacers are provided in a gas-insulated device in which a high-voltage conductor is housed in a grounded metal container in which an insulating gas is sealed. A gas pressure sensor that measures the gas pressure and outputs a gas pressure signal is arranged, and the gas pressure of the gas insulation device is monitored for each gas section of the gas insulation device based on the gas pressure signal from this gas pressure sensor. In the pressure monitoring device, at least one of the gas compartments is provided with gas temperature detecting means for measuring a gas temperature in the gas compartments and outputting a gas temperature signal, based on the gas pressure signal from the gas pressure sensor. A gas pressure monitoring device for gas insulation equipment, characterized in that the gas pressure is monitored by converting it to a pressure of a predetermined temperature based on the gas temperature signal. 2. The gas temperature detecting means is provided in all gas compartments of a gas insulation device.
A gas pressure monitoring device for the gas insulation device described. 3. The gas insulation device according to claim 2, wherein the gas pressure signal is configured to be monitored by converting it into a pressure of a predetermined temperature by a gas temperature signal of the same gas section. Gas pressure monitoring device. 4. The gas pressure monitoring of a gas insulation device according to claim 2, wherein the gas temperature signal is configured to use a signal consisting of an average value of gas temperatures of all gas sections. apparatus. 5. As the gas temperature signal, a signal composed of an average value of gas temperatures of a gas partition group or a gas temperature of a specific gas partition of the gas partition group is used for each gas partition group including a plurality of gas partitions. The gas pressure monitoring device for a gas insulation device according to claim 1, wherein the gas pressure monitoring device is configured as described above. 6. The gas pressure monitoring device for a gas insulation device according to claim 1, wherein the gas temperature detecting means is provided in the same case as the gas pressure sensor.