JP2019193463A - Gas leakage monitoring device for gas insulated switchgear and gas insulated switchgear - Google Patents

Abstract

To obtain a gas leakage monitoring device for a gas insulated switchgear that enables high-precision monitoring of gas leakage with a simple configuration.SOLUTION: A gas leakage monitoring device 2 of a gas insulated switchgear 1 monitors the leakage of insulating gas from a container 12 in which an insulating gas is sealed in the gas insulated switchgear 1. The gas leakage monitoring device 2 of the gas insulated switchgear 1 includes: a pressure sensor 22 that measures the pressure of the insulating gas inside the container 12; a temperature sensor that measures the temperature of the insulating gas inside the container 12; and a calculation unit that obtains a pressure value at a reference temperature by performing conversion based on the measurement result of the temperature by the temperature sensor on the measurement result of the pressure by the pressure sensor 22. The temperature sensor can be attached to the inside of a case 17 that is installed inside the container 12 and that stores a moisture adsorbent.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas leakage monitoring device for a gas insulated switchgear that monitors leakage of insulating gas sealed in a container of the gas insulated switchgear, and a gas insulated switchgear.

  The gas insulated switchgear includes a conductor to which devices such as a circuit breaker and a disconnector for protecting a transmission line are connected, and a structure that forms a sealed space in which the conductor is disposed. Such a structure is configured by connecting cylindrical containers. The sealed space is partitioned into spaces for each partition by a spacer provided at a connection portion between the containers, and an insulating gas is sealed in each partition. In order to prevent leakage of the insulating gas from the sealed space, the joint of the container is tightened with a fixing tool such as a screw or a bolt and sealed with a sealing material. When a part provided at such a joint loosens or deteriorates with time, a small amount and continuous leakage of insulating gas from the sealed space to the outside of the container occurs, and the gas-insulated switchgear As a result, the insulation performance gradually decreases. For this reason, the gas-insulated switchgear is provided with a gas leak monitoring device that monitors leakage of insulating gas.

  The gas insulated switchgear is provided with a pressure sensor for measuring the pressure of the insulating gas and a temperature sensor. The gas insulated switchgear obtains a pressure value at a reference temperature by converting the pressure value, which is a measurement result of pressure, by temperature. The gas insulated switchgear monitors insulation gas leakage based on the obtained transition of the pressure value.

  Patent Document 1 discloses a gas leak monitoring apparatus having a temperature sensor installed inside a container. By installing the temperature sensor inside the container, the temperature of the insulating gas can be measured more accurately than when the temperature sensor is installed outside the container. Since the gas leakage monitoring device can accurately detect a change in the pressure of the insulating gas by accurately measuring the temperature of the insulating gas, it is possible to monitor the gas leakage with high accuracy.

Japanese Utility Model Publication No. 60-190108

  In the configuration of Patent Document 1, the temperature sensor can be installed at a position that is directly exposed to the insulating gas, while the temperature sensor is required to be installed at a position where insulation from the conductor can be ensured. In order to ensure insulation between the temperature sensor and the conductor, the container may be provided with a dedicated case for storing the temperature sensor, or a dedicated branch pipe and lid plate. In this case, since the number of parts of the gas-insulated switchgear increases due to the addition of parts for installing the temperature sensor, the configuration of the gas-insulated switchgear can be monitored with high accuracy while being able to be monitored with high accuracy There was a problem of becoming.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a gas leakage monitoring device for a gas insulated switchgear that enables highly accurate monitoring of gas leakage with a simple configuration.

  In order to solve the above-described problems and achieve the object, a gas leakage monitoring device for a gas-insulated switchgear according to the present invention leaks insulating gas from a container in which an insulating gas is sealed. Monitor. A gas leakage monitoring device for a gas insulated switchgear according to the present invention includes a pressure sensor that measures the pressure of an insulating gas inside a container, a temperature sensor that measures the temperature of the insulating gas inside the container, and a pressure sensor that measures the pressure by the pressure sensor. A calculation unit that converts the measurement result based on the temperature measurement result obtained by the temperature sensor and obtains the pressure value at the reference temperature. A temperature sensor can be attached to the inside of the case that is installed inside the container and that stores the moisture adsorbent.

  According to the present invention, it is possible to monitor gas leakage with high accuracy with a simple configuration.

The figure which shows the gas leak monitoring apparatus of the gas insulated switchgear concerning Embodiment 1 of this invention. The block diagram which shows the structure of the gas leak monitoring apparatus shown in FIG. The figure which shows the part by which the circuit board was arrange | positioned among the gas insulated switchgear shown in FIG. The figure which shows the hardware constitutions in case the function of the control part which the gas leak monitoring apparatus shown in FIG. 2 has is implement | achieved by dedicated hardware. The figure which shows the hardware constitutions in case the function of the control part which the gas leak monitoring apparatus shown in FIG. 2 has is implement | achieved by the processor which executes the program stored in memory.

  Hereinafter, a gas leak monitoring device and a gas insulated switchgear according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a gas leak monitoring device of a gas insulated switchgear according to Embodiment 1 of the present invention. The gas leakage monitoring device 2 monitors leakage of the insulating gas from the container 12 in which the insulating gas is sealed in the gas insulated switchgear 1.

The gas insulated switchgear 1 includes a conductor 11 and a structure 10 that forms a sealed space in which the conductor 11 is disposed. The structure 10 is configured by connecting a plurality of containers 12. The container 12 has a cylindrical shape. Flange 14 is provided at both ends of the container 12 in the tube axis direction. The insulating spacer 13 is provided between the flanges 14 of the two containers 12 connected to each other. The sealed space is partitioned into spaces for each section by the insulating spacer 13. Each compartment is filled with insulating gas. An example of the insulating gas is SF ₆ gas. In FIG. 1, while showing the cross section of the container 12, the structure inside the structure 10 is shown typically. In FIG. 1, hatching indicating a cross section is omitted.

  The branch pipe 15 is provided on a cylindrical surface that is a side surface of the container 12. The branch pipe 15 is a circular pipe portion branched from the container 12 in a direction perpendicular to the pipe axis direction of the container 12. A branch pipe 15 is provided in each container 12. The lid plate 16 is a plate that closes the end of the branch pipe 15 opposite to the side connected to the container 12. The lid plate 16 is fixed to the branch pipe 15 by fastening fasteners such as screws or bolts. The cover plate 16 can be detached from the branch pipe 15 by loosening the fixing tool. In FIG. 1, illustration of the fixing tool is omitted.

  A case 17 in which a moisture adsorbent is accommodated is disposed inside the branch pipe 15. The case 17 is arrange | positioned for every division. The moisture adsorbent removes moisture in the sealed space by adsorbing moisture when moisture is mixed into the sealed space. The gas-insulated switchgear 1 can suppress a decrease in insulation performance due to the mixing of moisture into the sealed space by arranging the case 17 containing the moisture adsorbent in the branch pipe 15. As the material of the case 17, aluminum or other metal material is used.

  The gas leak monitoring device 2 includes a pressure sensor 22 that measures the pressure of the insulating gas inside the container 12, a circuit board 21 that has a temperature sensor that measures the temperature of the insulating gas inside the container 12, and a measurement by the pressure sensor 22. A processing device 20 is provided for processing the result and the measurement result by the temperature sensor. The circuit board 21 is attached to the inside of one case 17 among the cases 17 provided in each container 12. The pressure sensor 22 is provided in each container 12. The cable 25 connects a sealing terminal (described later) provided on the cover plate 16 and the processing device 20. The cable 26 connects the pressure sensor 22 and the processing device 20. The circuit board 21 may be provided in two or more cases 17.

  FIG. 2 is a block diagram showing a configuration of the gas leak monitoring apparatus shown in FIG. On the circuit board 21, a temperature sensor integrated circuit (IC) 23 that is a temperature sensor, and a connector 24 for connecting wiring to be described later to the temperature sensor IC 23 are mounted. The temperature sensor IC 23 is a semiconductor integrated circuit having a function of measuring temperature. The temperature sensor IC 23 generates a signal indicating the temperature measurement result based on the output voltage at a level corresponding to the temperature, and outputs the generated signal. The pressure sensor 22 measures the pressure inside the container 12 and outputs a signal indicating the measurement result of the pressure.

  The processing device 20 is an interface to which the cable 25 is connected and receives a signal transmitted from the circuit board 21 through the cable 25, and an interface to which the cable 26 is connected and the pressure sensor 22 connects the cable 26. And a receiving unit 32 for receiving the propagated signal. The processing device 20 includes a control unit 30 that is a functional unit that controls the entire processing device 20. The control unit 30 includes a calculation unit 35 that is a functional unit that obtains a pressure value at the reference temperature by performing conversion based on the measurement result of the temperature by the temperature sensor IC 23 on the measurement result of the pressure by the pressure sensor 22. The control unit 30 includes a determination unit 36 that is a functional unit that determines whether or not the pressure of the insulating gas satisfies a certain level based on the pressure value obtained by the calculation unit 35. The certain level is a level that is used as a criterion for determining whether or not the pressure of the insulating gas has decreased to such an extent that the desired insulating performance cannot be obtained.

  The processing apparatus 20 is a storage unit 33 that is a functional unit that stores a temperature measurement result and a pressure measurement result, and a notification that is a functional unit that notifies a calculation result by the calculation unit 35 and a determination result by the determination unit 36. Part 34. The notification unit 34 notifies the pressure value obtained by the calculation unit 35 to a device such as an operation panel or a control device outside the gas leakage monitoring device 2. In addition, when the determination unit 36 determines that the predetermined level is not satisfied, the notification unit 34 notifies an alarm to a device outside the gas leak monitoring device 2. The function of the notification unit 34 is realized by using a transmission unit that transmits information to an external device of the gas leakage monitoring apparatus 2.

The pressure sensor 22 measures the pressure value P _T of the insulating gas at a temperature T measured by the temperature sensor IC 23. The computing unit 35 performs conversion from the pressure value P _T to the gas density P ₂₀ by calculating the gas density P ₂₀ that is the pressure value of the insulating gas at the reference temperature of 20 ° C. using the following equation. . In the equation, L is a gas density coefficient.
P ₂₀ = P _T + L (20−T)

  The calculation unit 35 performs adjustment for removing a change corresponding to the temperature from the measured pressure value by such conversion. The gas leakage monitoring device 2 monitors the leakage of the insulating gas based on the pressure value from which the change corresponding to the temperature is removed. Thereby, the gas leak monitoring apparatus 2 can perform highly accurate monitoring of the gas leak.

  FIG. 3 is a view showing a portion where the circuit board is arranged in the gas insulated switchgear shown in FIG. FIG. 3 shows a portion of the gas insulated switchgear 1 that includes the cover plate 16 and the case 17. In FIG. 3, while showing the cross section of the cover plate 16 and the case 17, the structure inside the case 17 and the component provided in the cover plate 16 among the gas leak monitoring apparatuses 2 are shown.

  The case 17 is attached to the surface of the lid plate 16 on the inner side of the branch pipe 15. A moisture adsorbent 41 packed in a cloth bag is housed inside the case 17. The case 17 is provided with a hole through which an insulating gas can pass. The insulating gas can move between the inside and the outside of the case 17 by passing through the hole. In FIG. 3, illustration of holes through which the insulating gas passes is omitted.

  The circuit board 21 is attached to the inner wall of the case 17. An insulator 42 is provided between the circuit board 21 and the inner wall of the case 17. By providing the insulator 42, the circuit board 21 is insulated from the case 17. The wiring 46 connects the connector 24 of the circuit board 21 and the sealing terminal 43. The sealing terminal 43 is attached to the lid plate 16. As the material of the insulator 42, a phenol resin or other insulating material is used.

  A portion of the case 17 that is joined to the cover plate 16 is provided with a hole 45 through which the wiring 46 drawn from the inside of the case 17 is passed. The lid plate 16 is provided with a hole 44 through which the wiring 46 drawn from the hole 45 is passed. The hole 44 is closed by a sealing terminal 43 on the outer surface of the branch pipe 15 in the cover plate 16.

  The sealing terminal 43 is a terminal for preventing the insulating gas from leaking out of the container 12 from the hole 44 and connecting the wiring 46 and the cable 25. The gas leakage monitoring device 2 is provided with the sealing terminal 43, so that signals can be transferred between the temperature sensor IC 23 and the calculation unit 35 of the processing device 20 while keeping the container 12 airtight.

  The wiring 46 is secured by removing the cover plate 16 from the branch pipe 15, so that when the sealing terminal 43 is pulled away from the branch pipe 15 together with the cover plate 16, an extra length is drawn out from the branch pipe 15 to the outside. Has been. The surplus length is the length of the portion of the wiring 46 that exceeds the shortest distance between the connector 24 and the sealing terminal 43. Thereby, in the operation | work of replacement | exchange of the moisture adsorption agent 41, since the cover plate 16 can be removed with the wiring 46 connected to the connector 24 and the sealing terminal 43, the process which an operation | work requires is reduced. Can do.

  The position and shape of the case 17 are designed based on the result of electric field analysis performed in the test operation of the gas insulated switchgear 1. Since the circuit board 21 is disposed inside the case 17, it is not necessary to separately perform an electric field analysis for the installation of the circuit board 21. Electromagnetic waves generated inside the container 12 are shielded by the case 17. By arranging the circuit board 21 inside the case 17, it is not necessary to separately provide a component for shielding electromagnetic waves. During the opening / closing operation of the gas insulated switchgear 1, an opening / closing surge is generated inside the container 12. Since the circuit board 21 is insulated from the case 17 by the insulator 42, the influence of the switching surge can be prevented.

  Since the temperature sensor IC 23 is installed inside the container 12, the gas leak monitoring device 2 can perform an accurate measurement of the temperature of the insulating gas as compared with the case where the temperature sensor is installed outside the container 12. . Since the gas leak monitoring device 2 can accurately detect a change in the pressure of the insulating gas by accurately measuring the temperature of the insulating gas, it is possible to monitor the gas leak with high accuracy.

  If a dedicated branch pipe and a cover plate for placing the temperature sensor are provided separately from the branch pipe 15 and the cover plate 16 in which the case 17 is placed, the gas insulated switchgear 1 is installed in the temperature sensor. Therefore, the number of parts is increased by adding parts for the purpose. Further, when a case for arranging a temperature sensor is provided separately from the case 17, the number of parts of the gas insulated switchgear 1 is increased. The manufacturing cost of the gas insulated switchgear 1 increases due to an increase in the number of parts.

  According to the first embodiment, the gas leak monitoring apparatus 2 diverts the case 17 for storing the moisture adsorbent 41, the branch pipe 15 in which the case 17 is disposed, and the lid plate 16 in the installation of the temperature sensor IC 23. . The gas insulated switchgear 1 does not need to be provided with a branch pipe and a cover plate separately from the branch pipe 15 and the cover plate 16 for arranging the case 17. Further, the gas insulated switchgear 1 does not need to be provided with a case for storing the temperature sensor separately from the case 17. The gas insulated switchgear 1 can arrange | position the temperature sensor IC23, without adding the components for installation of a temperature sensor. For this reason, the gas leak monitoring device 2 can perform high-accuracy monitoring of the gas leak with a simple configuration without increasing the number of parts of the gas insulated switchgear 1.

  The function of the control unit 30 included in the gas leakage monitoring device 2 is realized by a processing circuit. The processing circuit is dedicated hardware mounted on the processing device 20 of the gas leak monitoring device 2. The processing circuit may be a processor that executes a program stored in the memory.

  FIG. 4 is a diagram illustrating a hardware configuration in a case where the function of the control unit included in the gas leakage monitoring apparatus illustrated in FIG. 2 is realized by dedicated hardware. The processing circuit 51 which is dedicated hardware includes a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or these It is a combination.

  FIG. 5 is a diagram illustrating a hardware configuration in a case where the function of the control unit included in the gas leakage monitoring apparatus illustrated in FIG. 2 is realized by a processor that executes a program stored in a memory. The processor 52 and the memory 53 are connected so as to communicate with each other. The processor 52 is a CPU (Central Processing Unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor). The function of the control unit 30 is realized by the processor 52 and software, firmware, or a combination of software and firmware. Software or firmware is described as a program and stored in the memory 53. The memory 53 is nonvolatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory). Built-in memory such as a semiconductor memory.

  A part of the function of the control unit 30 may be realized by dedicated hardware, and the other part of the function of the control unit 30 may be realized by software or firmware. Thus, the function of the control unit 30 can be realized by hardware, software, firmware, or a combination thereof.

  The temperature sensor included in the gas leak monitoring device 2 may be a thermistor that is a temperature sensor other than the temperature sensor IC23. In the first embodiment, the gas leak monitoring device 2 can be added to the existing gas insulated switchgear 1. The gas leak monitoring device 2 enables the temperature sensor to be disposed inside the container 12 of the gas insulated switchgear 1 without adding a part for installing the temperature sensor to the existing gas insulated switchgear 1. The components of the gas leak monitoring device 2 according to the first embodiment may be included in the configuration of the gas insulated switchgear 1.

  According to the first embodiment, the gas leak monitoring device 2 can attach a temperature sensor to the inside of the case 17 in which the moisture adsorbent 41 is housed, so that high-accuracy monitoring of gas leak is possible with a simple configuration. The effect that it becomes.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. The part can be omitted or changed.

  DESCRIPTION OF SYMBOLS 1 Gas insulation switchgear, 2 Gas leak monitoring apparatus, 10 Structure, 11 Conductor, 12 Container, 13 Insulation spacer, 14 Flange, 15 Branch pipe, 16 Cover plate, 17 Case, 20 Processing apparatus, 21 Circuit board, 22 Pressure Sensor, 23 temperature sensor IC, 24 connector, 25, 26 cable, 30 control unit, 31, 32 receiving unit, 33 storage unit, 34 notification unit, 35 calculation unit, 36 determination unit, 41 moisture adsorbent, 42 insulator, 43 Sealed terminal, 44, 45 holes, 46 wiring, 51 processing circuit, 52 processor, 53 memory.

Claims (4)

A gas leak monitoring device for a gas insulated switchgear for monitoring leakage of the insulating gas from a container filled with insulating gas among gas insulated switchgears,
A pressure sensor for measuring the pressure of the insulating gas inside the container;
A temperature sensor for measuring the temperature of the insulating gas inside the container;
A calculation unit that obtains a pressure value at a reference temperature by performing conversion based on the measurement result of the temperature by the temperature sensor to the measurement result of the pressure by the pressure sensor;
With
A gas leakage monitoring device for a gas insulated switchgear, characterized in that the temperature sensor can be installed inside a case which is installed inside the container and in which a moisture adsorbent is stored.   A sealing terminal that is attached to a cover plate that closes a branch pipe provided on a side surface of the container, and that is capable of passing a signal between the temperature sensor and the calculation unit while keeping the container airtight; The gas leak monitoring device for a gas insulated switchgear according to claim 1, wherein the gas leak monitoring device is a gas insulated switchgear.   The gas leakage monitoring device for a gas insulated switchgear according to claim 1 or 2, wherein the temperature sensor is a semiconductor integrated circuit having a function of measuring temperature. A container filled with insulating gas;
A case installed inside the container and containing a moisture adsorbent;
A pressure sensor for measuring the pressure of the insulating gas inside the container;
A temperature sensor attached to the inside of the case and measuring the temperature of the insulating gas inside the container;
A calculation unit that performs conversion based on the measurement result of the temperature by the temperature sensor to the measurement result of the pressure by the pressure sensor, and obtains a pressure value at a reference temperature;
A gas insulated switchgear characterized by comprising:

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