KR101177468B1 - A circuit breaker condition monitoring apparatus and method - Google Patents

Abstract

PURPOSE: A breaker monitoring apparatus and method are provided to diagnose the internal condition of a breaker by analyzing chemical components of insulation gas in the breaker. CONSTITUTION: A first flow valve(4) is connected to a breaker(1). A decompressor(5) reduces the pressure of insulation gas drawn out from the breaker. A sensor chamber(6) comprises a gas sensor measuring the concentration of decomposition gas included in the insulation gas depressurized by decompressor. An analyzer(14) diagnoses an error in the breaker according to the decomposition gas concentration measured by the gas sensor. A storage tank(20) stores the insulation gas used for measurement and analysis by the analyzer.

Description

Breaker Condition Monitoring Apparatus and Method

The present invention relates to a circuit breaker state monitoring device and method for monitoring the internal state of the circuit breaker by analyzing the chemical composition of the insulating gas in the circuit breaker.

In order to supply electricity generated from power plants to consumers (plants, offices, homes, etc.), various facilities are required, among which, transformers, breakers, and wires are key.

Most of the transformers of high voltage system use oil as insulator, gas breaker and synthetic resin. Transformers and wires are operated in static form, but breakers are operated in dynamic form, repeating opening and closing. That is, the breaker closes the supply of electricity and, on the contrary, opens the insulation. As such, the breaker is operated in a dynamic fashion that repeats closing and opening, resulting in high failure rates.

Sulfur hexafluoride (SF ₆ ) gas is used as an insulator in these breakers. SF ₆ gas is characterized by its excellent insulation performance, chemical safety, non-combustibility, and harmless to human body, so that gas power switch such as Gas Insulated Substation (GIS) and Gas Insulated Circuit Breaker (GCB) can be used. It is used a lot in equipment. However, the global warming ripple effect of SF ₆ gas is about 23,000 times that of carbon monoxide, and SF ₆ gas was designated as an emission control target at the Kyoto Conference on Preventing Global Warming. Therefore, the utility company collects SF ₆ gas from the device and reuses it when disassembling and inspecting the device.

If the breaker breaks down along with the three main facilities, transformers and wires, the power supply will be interrupted, so the utility company has a plan to prevent accidents (failures) in advance, and preventive inspections and repairs. However, these preventive checks and repairs are time-consuming and expensive, and often occur suddenly before the next repair period after the checks and repairs are performed.

Therefore, in recent years, the on-line condition monitoring system (On-Line Condition Monitoring System) that can always check whether there is an internal abnormality while the electric equipment is in operation.

If such a system is installed, regular inspection and maintenance are not necessary, and the inspection and repair can be performed only when an abnormal symptom is found, so that the economic benefit as well as the condition can be monitored at all times to detect the abnormality of performance immediately. In addition, accidental accidents can be prevented in advance, thus preventing power supply.

If an abnormality occurs in the breaker, insulation strength is lowered and local electric discharge (partial discharge) occurs. Therefore, we developed a sensor that can detect and measure such a partial discharge. come.

However, the conventional electrical system has a problem that can not check the internal state of the breaker before the breaker in the breaker.

The present invention has been made to solve the above problems, to provide a circuit breaker state monitoring device and method for diagnosing the internal state of the breaker by analyzing the chemical composition of the insulating gas in the breaker.

According to a feature of the present invention for achieving the above object, the breaker state monitoring apparatus according to the present invention is connected to the first flow valve and the output terminal of the first flow valve connected to the breaker, the insulation drawn out from the breaker A sensor chamber having a decompressor for reducing the pressure of the gas, a gas sensor for measuring the concentration of the gas contained in the insulating gas decompressed by the decompressor, and an internal pressure of the breaker according to the decomposition gas concentration measured by the gas sensor. An analyzer for diagnosing abnormalities, a temporary storage tank temporarily storing the insulation gas used for the measurement and analysis by the analyzer, and a pressurizer for pressurizing the insulation gas stored in the temporary storage tank and returning it to the breaker.

The insulating gas is characterized in that the sulfur hexafluoride (SF ₆ ) gas.

Preferably, the second flow valve connected to the air inlet for adjusting the air pressure injected from the outside, the filter for filtering impurities and moisture from the air supplied through the second flow valve, and the air filtered by the filter It further includes a filter selectively filtering and separating specific molecules and connected to the sensor chamber.

Preferably, further comprising a pure insulating gas tank for storing the pure insulating gas and connected to the first flow valve.

Preferably, the pipe cleaning further comprises an outlet for discharging air or pure insulating gas via the sensor chamber.

The sensor chamber is characterized in that it comprises at least one gas sensor for measuring the concentration of the decomposition gas.

The decomposition gas is characterized in that it comprises a sulfur dioxide (SO ₂ ) gas and hydrogen fluoride (HF) gas generated by working with the material inside the breaker when the breaker is opened.

In addition, the breaker state monitoring method according to the present invention, the step of performing the pipe cleaning and the zero adjustment of the gas sensor with air, the step of cleaning the pipe and checking the operation of the gas sensor with pure insulating gas, and insulation deteriorated from the breaker Measuring the concentration of the decomposition gas included in the insulation gas drawn out through the gas sensor by drawing gas, storing the deteriorated insulation gas in a temporary storage tank, and storing the insulation gas stored in the temporary storage tank. Pressurizing to return to the breaker.

The decomposition gas concentration measuring step, characterized in that for maintaining the flow rate and pressure of the deteriorated insulating gas is supplied to the gas sensor.

In the returning step to the insulating gas breaker, the temporary storage tank draws the stored insulating gas and pressurizes it to be higher than the pressure inside the breaker to generate a gas flow.

Therefore, the present invention according to the above problem solving means draws the insulating gas in the breaker and analyzes the chemical composition of the insulating gas, it is possible to always check whether there is an abnormality or abnormal progress in the breaker.

In addition, the present invention can be reused by extracting the insulating gas inside the circuit breaker to analyze the chemical components and inject again into the circuit breaker.

1 is a block diagram showing a circuit breaker state monitoring apparatus according to the present invention.
2 is a view for explaining the operation of the first step of measuring the internal state of the circuit breaker according to the present invention;
3 is a view for explaining the operation of the circuit breaker internal state measurement step 2 according to the present invention.
4 is a view for explaining the operation of the third stage of the internal state measurement circuit breaker according to the present invention.
5 is a view for explaining the operation of the circuit breaker internal state measurement step 4 according to the present invention.

Hereinafter, a circuit breaker state monitoring apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention is conceived from the phenomenon that the degree of residual gas decomposed when the breaker is opened varies depending on the breaker internal state of the gas insulated substation (GIS).

When the mechanical contact that is in contact with electricity falls inside the circuit breaker filled with insulating gas (eg SF ₆ ), an arc and spark with high heat occurs, which causes the SF ₆ gas, which is an insulating gas, to decompose instantly. It generates a small amount of various gases.

When the breaker is opened, the decomposed gas acts as an internal material to generate various kinds of SOF ₂ , SO ₂ F ₂ , SO ₂ , COS, HF, AlF ₃ , CuF ₂ , WO _3, etc. After the passage, the compound is returned to the SF ₆ gas and purified. However, some gas (mainly SO ₂ gas and HF gas) still remains in an abnormal state such as deterioration of the internal material of the breaker and wear of the contact. In the present invention, by using this phenomenon, the sulfur dioxide gas (SO ₂ ) and the hydrogen fluoride gas (HF) by the automatic measurement of the abnormality or abnormal progress in the breaker can always be monitored.

In addition, the present invention uses a gas circulation method that draws out the SF ₆ gas inside the breaker to the outside for a certain period of time to analyze, measure, and inject into the breaker, so that the insulation gas SF _{6 that} has been drawn out is put back into the breaker. It is recovered and reused.

1 is a block diagram showing a circuit breaker state monitoring apparatus according to the present invention.

As shown in Figure 1, the breaker condition monitoring apparatus according to the present invention is a plurality of valves (two- and three-way valve), two compressors (compressure), temporary storage tank for temporarily storing the insulating gas, when opening the breaker It consists of a sensor chamber to measure the cracked decomposition gas, a pressure reducer to reduce the pressure to the gas pressure set to the specifications of the gas sensor to measure the cracked gas, a flow valve to control the gas flow rate, and a pipe connecting them. . Each component constituting the breaker state monitoring device is controlled by a controller (not shown). The controller (not shown) may be implemented by a programmable logic controller (PLC) or software.

Referring to FIG. 1, the circuit breaker 1 is connected to the first flow valve 4 through the first valve 2 and the second valve 3. The circuit breaker 1 is filled with sulfur hexafluoride (SF ₆ ) gas, which is an electric insulation gas. The first valve 2 is a breaker valve for recovering / discharging the insulating gas and supplying pure insulating gas to the breaker 1, and the second valve 3 is an open / close valve for the gas supplied to the analyzer 14 to be described later. to be. The first flow valve 4 is connected to the sensor chamber 6 via a pressure reducer 5. The first flow valve 4 is installed at the input of the pressure reducer 5 to adjust the flow rate of the gas input to the pressure reducer 5. That is, the first flow valve 4 serves to adjust the flow of a certain amount of gas.

The pressure reducer 5 reduces the pressure of the gas input through the first flow valve 4 to a predetermined pressure and outputs the pressure. Here, the predetermined pressure is set based on the specification of the gas sensor provided in the sensor chamber 6. For example, when the set pressure is 200 millibars (mBar), the pressure reducer 5 lowers the gas pressure to 200 millibars when 300 millibars of gas is input. The pressure reducer 5 serves to maintain a certain amount of flow rate as well as a function of lowering the pressure of the gas discharged from the circuit breaker 1.

The sensor chamber 6 is provided with at least one gas sensor for detecting the presence or absence of a specific gas contained in the incoming gas. The specific gas is a decomposition gas generated by working with an internal material of the breaker 1 when the breaker 1 is opened, and includes sulfur dioxide (SO ₂ ) and hydrogen fluoride (HF) gas. The cracked gas remains inside the breaker in abnormal conditions such as deterioration of the inner material of the breaker 1 and wear of the contact. Therefore, the present invention will be described with an example of providing each gas sensor for measuring the concentration of sulfur dioxide gas and hydrogen fluoride gas.

The pure water insulating gas tank 7 is connected to the first flow rate valve 4 through the third valve 8 and the second valve 3. The pure insulating gas tank 7 stores the pure insulating gas SF ₆ used for cleaning the pipe and checking the operation of the sensor. The third valve 8 is a valve for controlling the pure insulating gas supply.

A first pressure gauge 9 is installed between the first to third valves 2, 3, and 8. The first pressure gauge 9 serves to measure the pressure of the insulating gas discharged from the breaker 1 or the pure insulating gas tank 7.

The air inlet 10 is connected to the filter 11 through a second flow valve 10-1 for adjusting the air pressure input through the air inlet 10, and the second flow valve 10-1 A second pressure gauge 10-2 is installed between the filters 11. The second pressure gauge 10-2 measures the air pressure supplied through the air inlet 10. The filter 11 removes impurities and moisture present in the air input through the air inlet 10. The filter 11 is composed of a PTFE (Polyterafluoroethylene) filter.

The filter 11 is connected to the filter 13 via a fourth valve 12. The fourth valve 12 supplies the air filtered by the filter 11 to the filter 13. In addition, the filter 13 selectively filters and separates specific molecules contained in the air filtered by the filter 11. That is, the filter 13 serves to remove hydrocarbon and water from the filtered air. The filter 13 is composed of Molecular Sieve used to select molecules in size. The filter 13 outputs the filtered air to the sensor chamber 6.

The filter 11 and the filter 13 perform filtering to supply clean air containing no impurities when cleaning the pipe using air.

The analyzer 14 is connected to the sensor chamber 6, and diagnoses the abnormality and the degree of abnormality in the breaker according to the decomposition gas concentration measured by the gas sensor provided in the sensor chamber 6.

The sensor chamber 6 is connected to the first discharge valve 17 through a pair of three-way valves 15-1 and 15-2. First and second three-way valves 15-1 and 15-2 are connected in parallel between the sensor chamber 6 and the first discharge valve 17. The first and second three-way valves 15-1 and 15-2 adjust the opening and closing direction during the cleaning and pressure regulation of the gas pipe. In addition, a first pressurizer 16 is installed between the first three-way valve 15-1 and the second three-way valve 15-2. The first three-way valve 15-1 and the second three-way valve 15-2 set a path of the gas discharged from the sensor chamber 6 according to the operation mode of the breaker state monitoring device.

The first three-way valve 15-1 and the second three-way valve 15-2 are provided with the sensor chamber 6 through the first pressurizer 16 only when the breaker state monitoring device operates in the gas component measuring mode. The path is set to be connected to the one discharge valve 17. In other operation modes, the first three-way valve 15-1 and the second three-way valve 15-2 block the path to the first pressurizer 16 and discharge the gas discharged from the sensor chamber 6. Bypass it.

The first discharge valve 17 discharges the gas output through the first and second three-way valves 15-1 and 15-2 to the outside through the discharge port 18. The first discharge valve 17 and the discharge port 18 discharge air and pure insulating gas used to clean the gas pipe to the outside.

The first and second three-way valves 15-1 and 15-2 are connected to the temporary storage tank 20 through the fifth valve 19. The fifth valve 19 is a valve for supplying the temporary storage tank 20 after the analysis of the insulating gas supplied from the breaker 1. The temporary storage tank 20 temporarily stores the insulation gas SF ₆ extracted from the breaker 1 for the gas component analysis before recovering it back to the breaker 1. A third pressure gauge 21 is installed between the fifth valve 19 and the temporary storage tank 20. The third pressure gauge 21 measures the pressure of the temporary storage tank 20.

The temporary storage tank 20 is connected to the breaker 1 through the second pressurizer 22, the second discharge valve 23, and the check valve 24. The second pressurizer 22 pressurizes the insulating gas stored in the temporary storage tank 20 and supplies it to the breaker 1.

When the second discharge valve 23 is opened, the insulating gas pressurized by the second pressurizer 22 is recovered to the breaker 1 via the check valve 24 and the first valve 2. The check valve 24 is to prevent backflow of the insulating gas from the breaker (1).

Hereinafter, a process of measuring the breaker state by the breaker state monitoring apparatus according to the present invention will be described in detail. The internal state of the breaker of the breaker state monitoring device is measured in four steps.

2 is a view showing the operation of the first step of measuring the internal state of the circuit breaker according to the present invention, Figure 3 is a view showing the operation of the second step of measuring the internal state of the circuit breaker according to the present invention, Figure 4 FIG. 5 is a view illustrating an operation process of a third stage of internal circuit breaker measurement according to the present invention, and FIG. 5 is a view illustrating an operation process of a fourth stage of internal circuit breaker measurement according to the present invention.

The controller of the breaker state detection device starts to measure the internal state of the breaker according to the measurement analysis data of hydrogen fluoride (HF) and sulfur dioxide (SO2) transmitted from the first flow valve through the GPRS (General Packet Radio Service) according to the time setting. .

First, the first step is to clean the pipe air and adjust the zero point of the gas sensor.

As shown in FIG. 2, the controller of the breaker state monitoring device closes the valves 2, 3, 8, 19, and 23, opens the second flow valve 10-1 to inject air, and Air pressure is measured through the pressure gauge 10-2. The second flow valve 10-1 is controlled to adjust the air pressure to have a predetermined pressure, and the fourth valve 12 and the first discharge valve 17 are opened. The fourth valve 12 supplies air introduced along the pipe from the outside through the air inlet 10 to the filter 11.

The filter 11 filters impurities and moisture from the air introduced through the air inlet 10. The air filtered by the filter 11 is supplied to the filter 13 via the fourth valve 12. The filter 13 removes hydrocarbons and water from the filtered air.

The air filtered by the filter 13 is discharged to the outside through the sensor chamber 6 and the first and second three-way valves 15-1 and 15-2, the discharge valve 17, and the discharge port 18. .

At this time, since there are no SO ₂ gas and HF gas in the atmosphere, the gas sensors provided in the sensor chamber 6 should have a measured value of '0'. If the measured value of the gas sensor is not '0', the administrator must adjust the '0' point of the gas sensor.

As described above, as the dry air passes through the pipe, the pipe is cleaned and at the same time, the zero point adjustment of the gas sensor provided in the sensor chamber 6 is performed. In the drawing, the piping drawings are enlarged and displayed for convenience, but since they are very close to the actual equipment, indirect cleaning effects in the pipes up to the first discharge valve 17 can be obtained in this process.

Next, a second step of cleaning the pipe and checking the operation of the sensor with pure insulating gas will be described.

As shown in FIG. 3, the controller closes the valves 2, 12, 19, 23, and then opens the second valve 3 and the third valve 8. The pure insulating gas SF ₆ in the pure insulating gas tank 7 is supplied to the first flow valve 4 by opening the second valve 3 and the third valve 8. The controller opens the first flow valve 4 for a predetermined time (eg 15 seconds).

When the pressure at the input end of the first flow valve 4 is about the same as that of the pure insulating gas tank 7, the controller gradually opens the first flow valve 4 to supply pure insulating gas to the pressure reducer 5. do. The pressure reducer 5 reduces the pressure of the pure insulating gas supplied to a predetermined pressure and outputs the pressure to the sensor chamber 6.

The gas sensors of the sensor chamber 6 measure and analyze the chemical composition of the pure insulating gas supplied to the sensor chamber 6. In other words, gas sensors measure the concentration of cracked gases (SO ₂ gas and HF gas) contained in the pure insulating gas. Here, the insulating gas injected into the sensor chamber 6 is pure, and gas sensors measuring at least one cracked gas should be measured as '0'. If the measured value of the gas sensors is not '0', it is adjusted to '0'. At this time, the gas sensors are also checked for malfunction.

In addition, the insulating gas supplied to the sensor chamber 6 is discharged to the outside through the discharge port 18 via the first and second three-way valves 15-1 and 15-2 and the first discharge valve 17. do. Thus, the effect of indirectly cleaning the pipe to the first discharge valve 17 with pure insulating gas as in the first step can be obtained.

The controller performs cleaning and zeroing of the pipe using air and pure insulating gas at a predetermined cycle.

The third step is to measure and analyze the insulating gas component in the circuit breaker, which will be described with reference to FIG. 4.

As shown in FIG. 4, the controller closes the third valve 8, the fourth valve 12, the first discharge valve 17, and the second discharge valve 23, and the first and second valves 2. , 3) and the fifth valve 19 are opened, and the first and second three-way valves 15-1 and 15-2 are adjusted to select a path through the first pressurizer 16.

The insulating gas deteriorated in the circuit breaker 1 by opening the first and second valves 2 and 3 is supplied to the input terminal of the first flow valve 4. When the pressure of the deteriorated insulating gas supplied to the first flow valve 4 becomes approximately equal to the pressure of the insulating gas in the circuit breaker 1, the first flow valve 4 is gradually opened to deteriorate the depressurizer 5. Supply insulation gas. Here, the pressure of the deteriorated insulating gas is measured using the first pressure gauge (9). The pressure reducer 5 reduces the pressure of the deteriorated insulating gas to a predetermined pressure and outputs the pressure to the sensor chamber 6. At this time, the controller controls the first flow rate valve 4 to supply the minimum insulated gas which is required for gas analysis.

Gas sensors provided in the sensor chamber 6 measure concentrations of SO ₂ gas and HF gas (decomposition gas) included in the deteriorated insulating gas supplied to the sensor chamber 6. The controller extracts the deteriorated insulating gas from the breaker 1 by a predetermined number of measurement times and performs gas analysis.

The analyzer 14 connected to the sensor chamber 6 diagnoses an abnormality in the breaker according to the concentration of SO ₂ gas and HF gas measured by the gas sensors, and diagnoses the progress of the abnormality in the breaker.

The deteriorated insulating gas via the sensor chamber 6 is supplied to the first pressurizer 16 via the first three-way valve 15-1. The first pressurizer 16 pressurizes the deteriorated insulating gas. The insulating gas pressurized by the first pressurizer 16 is stored in the temporary storage tank 20 via the second three-way valve 15-2 and the fifth valve 19.

As such, the breaker state monitoring apparatus purifies and temporarily stores the insulation gas drawn from the breaker to check the state of the breaker.

Finally, referring to Figure 5, a fourth step of returning the insulating gas used to check the internal condition of the breaker into the breaker will be described in detail.

First, the controller closes the second valve 3, the third valve 8, the fourth valve 12, the fifth valve 19, and the first discharge valve 17, and the first and second three-way valves ( 15-1 and 15-2 are operated to block the path via the first presser 16.

Then, the controller draws the insulating gas stored in the temporary storage tank 20 and supplies it to the second pressurizer 22. The second pressurizer 22 pressurizes the pressure of the insulating gas drawn out from the temporary storage tank 20 and discharges it through the second discharge valve 23 and the check valve 24. At this time, the second pressurizer 22 draws the insulating gas stored in the temporary storage tank 20 and presses it higher than the pressure inside the breaker, thereby generating a flow of the insulating gas. That is, the gas flows from the temporary storage tank 20 toward the breaker 1 by pressurizing the insulating gas stored in the temporary storage tank 20.

The pressurized insulating gas discharged from the temporary storage tank 20 is reinjected into the breaker 1 through the check valve 24. The controller stores the results analyzed by the analyzer 14. Then, the controller waits for a predetermined time until the gas recovery to the breaker (1) is completed.

The pipe cleaning and sensor calibration (zeroing) carried out in the first and second steps described above do not need to be repeated at every measurement, and are performed only when an external factor such as a change of equipment occurs or when it is necessary. . Therefore, in the case where the measurement is repeatedly performed at regular intervals, the first and second steps are omitted and only the third and fourth steps are performed.

Alternatively, the breaker state monitoring apparatus according to the present invention may include a switch for manually selecting at least one or more stages in the first to fourth stages.

In the present invention, the deteriorated insulation gas in the breaker 1 is taken out to measure the concentration of SO ₂ and HF gas contained in the deteriorated insulation gas through a gas sensor provided outside the breaker 1, but the gas in the breaker 1 Sensors can also be installed.

In the present invention described above, but the use of a device for analyzing the chemical composition of the insulation gas inside the circuit breaker to monitor the internal state of the circuit breaker alone, but may be used in combination with the conventional electrical partial discharge measuring device to improve the reliability. have.

1: breaker 2: first valve
3: second valve 4: first flow valve
5: pressure reducer 6: sensor chamber
7: Pure insulation gas tank 8: 3rd valve
9: 1st pressure gauge 10: Air inlet
10-1: 2nd flow valve 10-2: 2nd pressure gauge
11: filter 12: fourth valve
13: filter 14: analyzer
15-1: First three-way valve 15-2: Second three-way valve
16: 2nd pressurizer 17: 1st discharge valve
18: outlet 19: fifth valve
20: temporary storage tank 21: third pressure gauge
22: second pressurizer 23: second discharge valve
24: check valve

Claims (10)

A first flow valve connected to the breaker,
A pressure reducer connected to an output end of the first flow valve to reduce the pressure of the insulating gas drawn from the circuit breaker;
A sensor chamber having a gas sensor for measuring the concentration of cracked gas contained in the insulation gas decompressed by the pressure reducer;
An analyzer for diagnosing abnormality in the breaker according to the decomposition gas concentration measured by the gas sensor;
A temporary storage tank temporarily storing the insulation gas used for the measurement and analysis by the analyzer;
Breaker condition monitoring device comprising a pressurizer for returning the temporary storage tank stored insulation gas to the breaker. The method of claim 1, wherein the insulating gas,
Breaker condition monitoring device, characterized in that sulfur hexafluoride (SF ₆ ) gas. The method of claim 1,
A second flow valve connected to the air inlet for adjusting air pressure injected from the outside;
A filter for filtering impurities and moisture from air supplied through the second flow valve;
And a filter which selectively filters and separates specific molecules from the air filtered by the filter and is connected to the sensor chamber. The method of claim 1,
Breaker condition monitoring device for storing the pure insulating gas and further comprising a pure insulating gas tank connected to the first flow valve. The method according to claim 3 or 4,
Breaker condition monitoring device further comprises a discharge port for discharging air or pure insulating gas through the sensor chamber when cleaning the pipe. The method of claim 1, wherein the sensor chamber,
Breaker condition monitoring device comprising at least one gas sensor for measuring the concentration of the decomposition gas. The method of claim 6, wherein the decomposition gas,
Breaker condition monitoring device comprising a sulfur dioxide (SO ₂ ) gas and hydrogen fluoride (HF) gas generated by working with the internal material of the breaker when the breaker is opened. Cleaning the connecting pipe between the sensor chamber and the outlet with air and zeroing a gas sensor provided in the sensor chamber;
Checking the operation of the gas sensor by cleaning the connection pipe between the connection pipe and the circuit breaker and the sensor chamber with pure insulating gas;
Extracting the deteriorated insulation gas from the circuit breaker and measuring a concentration of the decomposition gas included in the insulation gas drawn through the gas sensor;
Storing the deteriorated insulating gas in a temporary storage tank;
And pressing the insulating gas stored in the temporary storage tank to return to the breaker. The method of claim 8, wherein the decomposition gas concentration measuring step,
Breaker state monitoring method characterized in that the constant flow rate and pressure of the insulation gas is supplied to the gas sensor. The method of claim 8, wherein the returning to the insulation gas circuit breaker,
Breaker state monitoring method characterized in that the temporary storage tank draws out the stored insulating gas and pressurized to higher than the pressure inside the breaker to generate a gas flow.

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