KR101315995B1 - Apparatus for managing insulating gas of ground equipment in live wire and method thereof - Google Patents

Abstract

PURPOSE: An apparatus for managing the insulating gas of ground equipment in a live wire status and a method thereof are provided to filter gas and inject the filtered gas, thereby reducing the environmental pollution. CONSTITUTION: An insulating gas analysis and test unit (150) measures the impurity concentration of insulating gas. A collection tank (160) collects the insulating gas within ground equipment (100). A filter unit (170) filters the impurities of the insulation gas within the collection tank. An insulating gas injection unit (180) provides the filtered insulating gas to the ground equipment. A control unit (130) determines whether to replace the insulating gas. [Reference numerals] (100) Insulating gas within ground equipment; (101) Manometer; (102) Gas inlet; (110) Connector; (120) Insulating gas management device; (130) Control unit; (150) Insulating gas analysis and test unit; (160) Collection tank; (170) Filter unit; (180) Insulating gas injection unit; (190) Auxiliary collection tank; (195) Injecting tank

Description

Grounding equipment insulation gas management device and its method in the live state {APPARATUS FOR MANAGING INSULATING GAS OF GROUND EQUIPMENT IN LIVE WIRE AND METHOD THEREOF}

The present invention relates to a ground equipment insulation gas management apparatus and method thereof in a live state, and more particularly, to analyze the insulation gas filled in the ground equipment in a live state, and to recover the insulation gas and filter the gas according to the analysis result. The present invention relates to a ground equipment insulated gas management apparatus and a method thereof in a live state that can efficiently replace the insulated gas in the ground equipment.

With the rapid commercialization, Korea has continued to expand large-scale power facilities such as power transformers and switchgear, which are essential for industrialization.

In general, power is supplied from the substation to the consumer by boosting the power to approximately 22,000 ~ 26,000kW. In order to protect the power system, the electric power company uses a ground transformer that can boost or reduce the voltage on the ground or outdoors of the sidewalk. Install ground equipment such as transformers and pad switches that can control the power supply, and protect the ground equipment. Installs a protective box to manage it safely.

On the other hand, in the case of ground equipment such as ground switchgear, the core has electrical and electronic components that require electrical insulation, and these are embedded in an electrical insulator filled with insulating gas in a sealed space to ensure stability.

Insulation gas filled in the ground equipment typically uses SF6 gas. SF6 gas is used in insulating materials and semiconductor manufacturing processes of most major power equipment except transformers. SF6 gas is one of the world's best materials for insulation and arc removal, but it is a representative environment that is designated as six global warming gases together with carbon dioxide, methane, nitrogen dioxide, hydrogen fluorocarbon, and perfluorocarbon. It is also a pollutant. As a result, the Kyoto Protocol on Climate Change, which entered into force in February 2005, regulates its use. SF6 gas has the highest global warming effect among the six global warming gases defined by the Kyoto Protocol.

However, in most gas insulated power equipment, most countries in Korea and abroad still apply the insulation method using SF6 gas.

In the case of overhauling or expanding SF6 gas using facilities, the existing gas is blown away and filled with new gas due to problems such as gas purity deterioration or impurity mixing. In particular, the ground equipment performs inspection after recovering all SF6 gas filled inside during periodical overhaul, and most of the recovered SF6 gas is recycled and is not reused and replaced with new SF6 gas. This unusable SF6 gas is accelerating environmental pollution.

Meanwhile, in order to overcome environmental pollution, the conventionally disclosed technology uses a analyzer and a vacuum compressor to disclose a technique of partially analyzing and analyzing a gas of a storage device and storing the gas according to the analysis, and using the stored gas when injecting a new gas. This is done when the power is cut off, and by using a part of the stored gas when a new gas is injected, it takes a long time to replace it, and maintains purity, concentration, and moisture content according to use of the stored gas. There was a problem that could not be.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-1083758 (November 18, 2011).

Therefore, the technical problem to be achieved by the present invention is to analyze the insulation gas filled in the ground equipment in the live state, and to effectively filter and regenerate the insulation gas in the ground equipment by recovering the insulation gas and gas filtering according to the analysis result It is to provide a gas management device and a method thereof.

An apparatus for managing the insulation gas in the ground equipment in the live state according to an embodiment of the present invention for achieving the technical problem,

An insulation gas analysis test unit which measures at least one of purity of the insulation gas in the ground apparatus, concentration of impurities contained in the insulation gas, and moisture content of the insulation gas; A recovery tank for recovering the insulating gas in the ground apparatus; A filter unit filtering and removing impurities of the insulating gas in the recovery tank; And a control unit for determining whether to replace the insulation gas according to the analysis result of the insulation gas analysis test unit, and controlling the recovery tank so that the insulation gas of the ground apparatus is recovered when the replacement is determined. The insulation gas is recovered to the recovery tank up to a preset pressure threshold of the device.

The control unit may be configured to control a first check valve connected between the insulation gas analysis test unit and the ground device, and a second check valve connected to the recovery tank and the ground device, respectively, to be input to the insulation gas analysis test unit. The amount of gas and the amount of insulating gas recovered in the recovery tank can be adjusted.

Here, when the insulation gas is recovered in the recovery tank, the control unit may open a third check valve connected between the recovery tank and the filter unit to control the insulation gas of the recovery tank to be delivered to the filter unit.

Here, the insulation gas management device may further include an insulation gas injection unit for storing the insulation gas filtered by the filter unit and providing the insulation gas to the ground apparatus.

The control unit may open a fourth check valve connected between the filter unit and the insulation gas injection unit to store the filtered insulation gas in the insulation gas injection unit.

Here, the controller may open the fifth check valve connected between the insulation gas injector and the ground apparatus to transfer the filtered insulation gas to the ground apparatus.

Herein, the control unit opens a sixth check valve connected between an external tank and the insulating gas injection unit to filter the insulating gas flowing from the external tank and the filtered insulating gas stored in the insulating gas injection unit to the ground apparatus. I can deliver it.

Here, the insulation gas management device may further include an auxiliary recovery tank for storing the portion of the insulation gas measured by the insulation gas analysis test unit.

Here, the control unit may open a seventh check valve connected between the auxiliary recovery tank and the recovery tank to control the insulation gas analyzed by the insulation gas analysis test unit to be delivered to the recovery tank.

Here, the control unit may receive the internal pressure information from the ground apparatus, and control the recovery tank to store the insulation gas to the recovery tank to the predetermined pressure threshold based on the received pressure information.

The control unit may be configured to apply the insulating gas to the insulating gas of the ground apparatus until the purity of the insulating gas, the concentration of the impurities, and the moisture content in the insulating gas satisfy the preset reference conditions received from the insulating gas analysis test unit. The analysis, recovery and filtering of the insulation gas may be performed repeatedly.

Insulation gas management method of the device for managing the insulation gas in the ground apparatus in the live state according to another embodiment of the present invention,

Detecting at least one of purity, concentration of impurities contained in the insulation gas, and moisture content in the insulation gas by detecting the insulation gas in the ground apparatus; If the analysis result does not satisfy a preset criterion, recovering the insulation gas up to a preset pressure threshold in the ground apparatus; Performing filtering to remove impurities of the recovered insulating gas; And injecting the filtered insulating gas into the ground apparatus.

Here, the insulation gas management method may further include receiving information on the pressure state of the ground apparatus.

Here, in the recovering the insulating gas, the insulating gas of the ground apparatus may be recovered to the pressure threshold based on the received information about the pressure state.

Here, the insulation gas management method may further include delivering the analyzed insulation gas to the recovery tank.

Here, the recovering may include analyzing the insulation gas with respect to the insulation gas of the ground apparatus until the purity of the insulation gas, the concentration of the impurities, and the moisture content in the insulation gas satisfy each preset reference condition. Retrieval and filtering may be repeated.

Thus, according to the present invention, by analyzing a part of the insulating gas filled in the ground equipment in the live state, and by re-injecting the insulating gas recovery and gas filtering according to the analysis results, the ground gas replacement time of the ground equipment While minimizing, the effect of efficiently maintaining the purity, concentration and moisture content of the stored gas can be expected.

In addition, it is possible to efficiently reduce replacement costs through recycling the insulating gas, it can be expected to minimize the environmental pollution.

1 is a view showing in detail the insulation gas management apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating an insulation gas management method according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

First, the configuration of the ground equipment insulation gas management apparatus in the live state according to an embodiment of the present invention will be described in detail.

1 is a view showing in detail the insulation gas management apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the insulation gas management apparatus 120 according to an embodiment of the present invention includes a control unit 130, a three-way valve 140, an insulation gas analysis test unit 150, a recovery tank 160, and a filter. The unit 170, the insulating gas injection unit 180, the auxiliary recovery tank 190 and a plurality of first to eighth check valve (121, 122, 123, 124, 125, 126, 127, 128), It is connected to the ground device 100 and the connector 110. In this case, the insulation gas injection unit 180 of the insulation gas management device 120 is connected to the injection tank 195 through the sixth check valve 126.

First, the ground device 100 includes all power devices using insulation gas, that is, ground switchgear, overhead line circuit breaker, substation power device, and gas insulation switchgear (GIS). It shows an apparatus to make. Such, the ground apparatus 100 is safely installed by installing in a protective box (not shown).

Here, as the insulating gas, sulfur hexafluoride gas (SF6; sulfur hexafluoride) is used, and other materials having low electrical conductivity and thermal conductivity and hardly communicating heat flow may be used.

The ground apparatus 100 includes a pressure gauge 101 and a gas inlet 102, and the pressure gauge 101 measures the pressure of the insulating gas in the ground apparatus 100 and provides the pressure to the controller 130. The inlet 102 is connected to the connector 110 and functions to recover / inject the insulation gas into the ground apparatus 100.

The connector 110 is connected to the gas inlet 102 of the ground apparatus 100 to provide a moving passage of the insulating gas. The other side of the connector 110 is connected to the three way valve 140.

The three way valve 140 is connected to the connector 110 to provide a passage for the insulation gas. The other sides of the three-way valve 140 are connected in parallel with the insulation gas analysis test unit 150, the recovery tank 160, and the insulation gas injection unit 180, respectively.

Here, the first check valve 121 is connected between the three-way valve 140 and the insulation gas analysis test unit 150, and the second check valve is disposed between the three-way valve 140 and the recovery tank 160. 122) is connected. In addition, the fifth check valve 125 is connected between the three-way valve 140 and the insulating gas injection unit 180.

The insulation gas analysis test unit 150 measures the purity of the insulation gas recovered from the ground apparatus 100, the concentration of the impurities contained in the insulation gas, and the moisture content of the insulation gas, and provides it to the controller 130.

The recovery tank 160 recovers and stores the insulation gas in the ground apparatus 100 and the insulation gas of the auxiliary recovery tank 190.

The filter unit 170 filters the insulating gas stored in the recovery tank 160.

The insulation gas injection unit 180 mixes the insulation gas filtered by the filter unit 170 and the insulation gas injected from the injection tank 195 and injects it into the ground apparatus 100.

The auxiliary recovery tank 190 recovers and stores a small amount of analyzed gas in the insulation gas analysis test unit 150, and provides the stored gas to the recovery tank 160. Here, the seventh check valve 127 is connected between the auxiliary recovery tank 190 and the recovery tank 160, and the eighth check valve 128 is connected between the auxiliary recovery tank 190 and the insulation gas analysis test unit 150. ) Is connected.

Meanwhile, in the embodiment of the present invention, the auxiliary recovery tank 190 is separately configured, but the auxiliary recovery tank 190 may be provided in the recovery tank 160.

The controller 130 determines whether to replace the insulating gas in response to the purity, concentration, and moisture content of the insulating gas measured by the insulating gas analysis test unit 150, and if the insulating gas replacement is determined, the ground apparatus 100 In order to replace the insulation gas, the first to eighth check valves 121, 122, 123, 124, 125, 126, 127, and 128, insulation gas analysis test unit 150, auxiliary recovery tank 190, and recovery tank ( 160, the operations of the filter unit 170 and the insulating gas injection unit 180 are sequentially controlled.

At this time, the controller 130 is based on the internal pressure information of the ground apparatus 100 received from the pressure gauge 101 of the ground apparatus 100, so that the pressure in the ground apparatus 100 is not lowered below the set threshold. The check valve 122 and the recovery tank 160 are controlled to recover the insulation gas of the ground apparatus 100.

In addition, the controller 130 controls the third check valve 123, the fourth check valve 124, and the filter unit 170 to perform filtering to remove impurities of the insulating gas recovered in the recovery tank 160. The filtered insulating gas is stored in the insulating gas injection unit 180. Here, the impurity means an unnecessary substance except SF6, such as moisture.

In addition, the controller 130 controls the fifth check valve 125 and the insulating gas injecting unit 180 to control the insulating gas stored in the insulating gas injecting unit 180 through the three-way valve 140. Inject in.

In addition, the control unit 130, when recovering the insulating gas of the recovery tank 160, the seventh check valve 127 and the eighth check valve 128 connected between the insulating gas analysis test unit 150 and the recovery tank 160. ) By controlling the insulation gas analysis test unit 150 to move a small amount of insulation gas analyzed through the auxiliary recovery tank 190 to the recovery tank 160. In detail, when the insulation gas analysis test unit 150 analyzes the insulation gas, the controller 130 opens the eighth check valve 128 to recover the analyzed insulation gas to the auxiliary recovery tank 190. 7 opens the check valve 127 to recover the gas stored in the auxiliary recovery tank 190 to the recovery tank 160.

 Through this, the insulation gas management device 120 can filter and recycle most of the insulation gas used, thereby significantly reducing the outflow of the insulation gas to the outside, thereby minimizing environmental pollution.

In addition, the controller 130 controls the sixth check valve 126 connected to the injection tank 195 in which the new insulation gas is stored, and provides the new insulation gas to the insulation gas injection unit 180. In this case, the insulation gas injection unit 180 mixes the filtered insulation gas and the new insulation gas and injects it into the ground apparatus 100.

On the other hand, the control unit 130 according to an embodiment of the present invention can be implemented using a microcomputer, has a central processing unit and a memory, and various terminals (eg, mobile terminal, netbook, Laptops).

On the other hand, the insulation gas management device 120 according to an embodiment of the present invention is configured a plurality of check valves 121, 122, 123, 124, 125, 126, 127, 128 separately, each device 150, 160, 170, 180, 190 may be configured to include check valves, respectively. In this case, the controller 130 controls the movement of the insulating gas by controlling the devices 150, 160, 170, 180, and 190.

Hereinafter, an insulation gas management method of an insulation gas management apparatus for replacing, filtering and managing insulation gas in the ground apparatus in the live state will be described with reference to FIG. 2.

2 is a flowchart illustrating an insulation gas management method according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the ground apparatus 100 according to the present invention maintains a live state in which the power is not turned off when the insulating gas is replaced (S100), and the ground apparatus 100 moves to the outside during the live state. Can supply power In this case, the ground apparatus 100 generally maintains an internal gas pressure of about 0.7 bar.

On the other hand, when the control unit 130 receives an insulation gas inspection activation command from the user or when the preset insulation gas replacement activation time is reached, the controller 130 starts a replacement operation for the insulation gas in the live ground apparatus 100 (S202). .

First, when the control unit 130 starts the replacement operation, the first check valve 121 is opened for about 2 seconds, and a small amount of the insulation gas built into the ground apparatus 100 into the insulation gas analysis test unit 150. To pass.

Insulation gas analysis test unit 150 analyzes the purity, concentration, and water content of the insulated gas sent to provide the analysis data to the controller 130 (S204).

When the controller 130 receives the analysis data from the insulation gas test analyzer 150, the controller 130 opens the eighth check valve 128 to move the small amount of insulation gas to the auxiliary recovery tank 190 after the analysis is completed.

In addition, the controller 130 receives insulation gas component analysis data on the purity, concentration, and moisture content of the insulation gas from the insulation gas analysis test unit 150, and determines whether the components of the analyzed insulation gas satisfy the set criteria. It is determined (S206).

That is, the controller 130 determines whether the components of the insulating gas satisfy all of the conditions of 95% or more, the concentration is less than 2 ppm, and the moisture content is less than 1000 ppm, which is a preset reference condition. In this case, it is determined that the set criteria are satisfied.

As a result of the determination in step S206, when the analyzed insulating gas does not satisfy the set criteria and the replacement gas is determined, the controller 130 opens the second check valve 122 and opens the recovery tank 160. By controlling and recovering the insulating gas in the ground apparatus 100 to the recovery tank 160 to the set pressure threshold (S208).

In this case, the controller 130 may also open the seventh check valve 127 to transfer a small amount of insulating gas stored in the auxiliary recovery tank 190 to the recovery tank 160.

Here, the control unit 130 receives the real-time pressure information from the pressure gauge 101 of the ground device 100, when the pressure in the ground device 100 is 0.15 bar, stops the recovery of the insulating gas of the recovery tank 160 The second check valve 122 is closed.

In the live condition, minimum pressure (typically 0.15 bar) should be maintained to ensure stability during development testing. Therefore, according to the embodiment of the present invention, the control unit 130 of the ground apparatus 100 monitors the pressure value of the pressure gauge 101 in real time at the time of recovering the insulating gas, and recovers the instant when the pressure value becomes 0.15 bar which is the pressure threshold value. Control to stop.

As such, when the insulating gas built in the ground apparatus 100 is recovered to the recovery tank 160, the controller 130 may remove the impurities in the insulating gas in the recovery tank 160. Open to inject the insulating gas in the recovery tank 160 to the filter unit 170 (S210). In addition, the controller 130 also opens the fourth check valve 124 to transfer the filtered insulating gas to the insulating gas injection unit 180.

In addition, when the insulation gas injection unit 180 recovers all the filtered insulation gas, the controller 130 closes the third check valve 123 and the fourth check valve 124 and closes the sixth check valve 126. Open so that a new insulating gas of the injection tank 195 is injected into the insulating gas injection unit 180. At this time, since the amount of the filtered gas is insufficient as mixed with impurities, a new gas is injected to compensate for this.

Then, the controller 130 opens the fifth check valve 125 so as to fill the insulation gas in the ground apparatus 100, and filters the filtered insulation gas stored in the insulation gas injection unit 180 to the gas of the ground apparatus 100. Inject through the injection hole (102). At this time, the control unit 130 injects the insulating gas until the pressure of the insulating gas in the ground apparatus 100 becomes the development test reference value (approximately 0.7 bar) (S212).

After injecting the insulating gas into the ground apparatus 100, the controller 130 repeats S204 to S212 until it is determined that the measurement results of the purity, concentration, and water content of the filtered insulating gas satisfy the reference conditions. .

That is, when the controller 130 does not satisfy at least one of the purity, concentration, and moisture content of the insulation gas embedded in the ground apparatus 100, the control unit 130 repeats steps S204 to S212 to increase the purity, Lower the moisture content; At this time, the controller 130 may control to repeat for a set time to satisfy the purity, concentration, moisture content conditions. For example, it may be set to repeat the process S204 to S212 five times for two hours.

As a result of the determination in step S206, when the analyzed insulation gas satisfies the set criteria, the controller 130 determines that the insulation gas does not need to be replaced, notifies the user that no replacement is required, and ends the replacement operation.

On the other hand, according to an embodiment of the present invention, the insulation gas pressure inside the ground apparatus 100 is generally 0.7 bar and the minimum allowable pressure has been described as 0.15 bar. However, since the power environment or the type of insulation gas may vary by manufacturer, The magnitude of the insulation gas pressure can be changed.

As described above, according to the embodiment of the present invention, the insulation gas management apparatus recovers the insulation gas of the ground apparatus in the live state, filters the recovered insulation gas, and injects the recovered insulation gas back into the ground apparatus, thereby reducing the cost of new insulation gas injection. And it has a big advantage that can effectively reduce the insulation gas replacement time. In addition, by filtering all the used insulating gas and recycling, there is an advantage that can minimize the environmental pollution.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: ground equipment 101: pressure gauge
102: gas inlet 103: connector
120: insulation gas management device 121: first check valve
122: second check valve 123: third check valve
124: fourth check valve 125: fifth check valve
126: sixth check valve 127: seventh check valve
128: eighth check valve 130: control unit
140: three-way valve 150: insulation gas analysis test
160: recovery tank 170: filter unit
180: insulated gas injection unit 190: auxiliary recovery tank
195: injection tank

Claims (12)

In the device for managing the insulation gas in the ground equipment in the live state,
An insulation gas analysis test unit which measures at least one of purity of the insulation gas in the ground apparatus, concentration of impurities contained in the insulation gas, and moisture content of the insulation gas;
A recovery tank for recovering the insulating gas in the ground apparatus;
A filter unit filtering and removing impurities of the insulating gas in the recovery tank;
An insulated gas injection unit storing the insulated gas filtered by the filter unit and providing the insulated gas to the ground apparatus;
A control unit for determining whether to replace the insulation gas according to the analysis result of the insulation gas analysis test unit, and if the replacement is determined, recover the insulation gas of the ground apparatus to the recovery tank and control the filter to be filtered by the filter unit; And
And first, second, third and fourth check valves connected between the ground apparatus, the insulation gas analysis test unit, the recovery tank, the filter unit, and the insulation gas injection unit, respectively.
The control unit,
When the insulation gas is controlled to be recovered to the recovery tank up to a preset pressure threshold of the ground equipment, and when the purity, concentration, and moisture content of the insulation gas received from the insulation gas analysis test part satisfy each preset reference condition. Repeat the analysis, recovery and filtering of the insulating gas to the insulating gas of the ground equipment, and controls to store the insulating gas to the recovery tank to the predetermined pressure threshold based on the internal pressure information received from the ground equipment. Insulation gas management device. The method of claim 1,
The control unit,
The amount of insulation gas and the number of the insulation gas inputted to the insulation gas analysis test unit by controlling the first check valve and the recovery tank and the second check valve connected to the ground device, respectively, between the insulation gas analysis test unit and the ground apparatus. Insulation gas management device that controls the amount of insulation gas recovered to the tank. 3. The method of claim 2,
The control unit, when the insulation gas is recovered in the recovery tank by opening the third check valve connected between the recovery tank and the filter unit to control the insulation gas of the recovery tank to be delivered to the filter unit. The method of claim 3,
The control unit, the insulating gas management device for opening the fourth check valve connected between the filter unit and the insulating gas injection unit to store the filtered insulating gas to the insulating gas injection unit. 5. The method of claim 4,
The control unit, the insulation gas management device for opening the fifth check valve connected between the insulation gas injection unit and the ground equipment to deliver the filtered insulation gas to the ground equipment. The method of claim 5,
The control unit opens a sixth check valve connected between an external tank and the insulating gas injection unit to transfer the insulating gas flowing from the external tank and the filtered insulating gas stored in the insulating gas injection unit to the ground apparatus. Insulation gas management device. The method of claim 5,
Further comprising a secondary recovery tank for storing the portion of the insulation gas measured by the insulation gas analysis test unit,
The control unit,
Insulating gas management device for controlling the insulation gas analyzed by the insulation gas analysis test unit to be delivered to the recovery tank by opening a seventh check valve connected between the auxiliary recovery tank and the recovery tank. delete delete In the insulation gas management method of the device for managing the insulation gas in the ground equipment in the live state,
Detecting at least one of purity, concentration of impurities contained in the insulation gas, and moisture content in the insulation gas by detecting the insulation gas in the ground apparatus;
Delivering the analyzed insulating gas to a recovery tank;
Receiving information about a pressure state of the ground apparatus;
If the analysis result does not satisfy a preset criterion, recovering the insulation gas in the ground apparatus to the recovery tank up to a preset pressure threshold based on the received information on the pressure condition;
Performing filtering to remove impurities of the recovered insulating gas; And
Injecting the filtered insulating gas into the ground apparatus;
The recovering step,
Insulation gas which repeats the analysis, recovery and filtering of the insulation gas with respect to the insulation gas of the above-mentioned ground equipment until the purity of the insulation gas, the concentration of the impurities, and the moisture content in the insulation gas satisfy each preset reference condition. How to manage.



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