KR101178897B1 - Method of analysing and feeding insulation gas for pad switch and system thereof - Google Patents

Abstract

PURPOSE: Methods of analyzing and filling insulation gas for a pad switch and a system thereof are provided to collect insulation gas over 99.9% by successively using an insulation gas collecting tank and a vacuum pump. CONSTITUTION: A pad switch(110) includes a breaker(111). A connector(120) is installed on an inlet of the pad switch. A micom(130) decides the replacement of insulation gas(112) based on purity, concentration and water content of the insulation gas. The micom successively controls an insulation gas analysis tester(140), an insulation gas collecting tank(150), a vacuum pump(160) and an insulation gas injection tank(170). A first to a fourth check valves(121-124) are respectively connected to the insulation gas analysis tester, the insulation gas collecting tank, the vacuum pump and the insulation gas injection tank.

Description

Insulation gas analysis and reinforcement method of ground equipment, and its system {Method of Analysing and Feeding Insulation Gas For Pad Switch and System Thereof}

The present invention relates to an insulation gas analysis and reinforcement method and system of the ground equipment, and more particularly, to analyze the state of the insulation gas filled in the ground equipment, and to replace the insulation gas quickly and automatically according to the analysis result. It is about how.

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

As the above-mentioned ground equipment has been used for a long time, its aging is currently appearing, and it is in a state of need for continuous replacement and management. Here, power equipment such as the above ground equipment is expensive and large in size, and thus requires a lot of replacement costs, and requires a long working time and a lot of manpower.

On the other hand, in the case of ground equipment such as ground switchgear, the core includes electrical and electronic components that require electrical insulation, and are secured by being embedded in an electrical insulator filled with insulating gas in an enclosed space.

However, the ground breaker mainly installed in the underground wiring path may be damaged by cracks due to prolonged use or deterioration of the insulating gas due to the external environment.In this case, the insulating gas leaks to the outside to prevent its function. Since it is impossible to carry out, it is necessary to replace the entire expensive land equipment.

In addition, the replacement of the above-mentioned ground equipment must be handled by the operator entirely, so it takes a long time to replace and there is a problem in that the inexperienced worker may lack reliability in insulating gas replacement.

The present invention has been made to solve the above-mentioned problems, and when the insulating gas filled in the ground equipment such as the ground switch is leaked by damage or degraded by the external environment, the ground equipment can be easily replaced without replacing the ground equipment itself. The purpose of the present invention is to provide an insulation gas analysis and reinforcement method of ground equipment that can prevent leakage by performing insulation reinforcement, and can quickly and automatically replace insulation gas.

The insulation gas analysis and reinforcement system of the ground equipment according to the present invention includes a circuit breaker therein, and the ground equipment is filled with insulation gas around the circuit breaker, and is mounted at the inlet of the ground equipment, insulation gas analysis tester, insulation gas. A connector connected in parallel with each of the recovery tank, the vacuum pump and the insulating gas injection tank, and determines whether to replace the insulating gas in response to the purity, concentration and moisture content of the insulating gas, The replacement decision includes a microcomputer that sequentially controls the operation of the insulation gas analysis tester, insulation gas recovery tank, vacuum pump and insulation gas injection tank.

First, second, third and fourth check valves may be connected between the connector and the insulation gas analysis tester, insulation gas recovery tank, vacuum pump and insulation gas injection tank, respectively.

The microcomputer may control the insulation gas to be sent to the insulation gas analysis tester by opening the first check valve, and receive the purity and concentration moisture content data of the insulation gas sent from the insulation gas analysis tester. .

The microcomputer, when at least one of the purity, concentration, and moisture content data of the insulation gas does not satisfy the reference condition, closes the first check valve and opens the second check valve to insulate the built-in device in the ground. The gas may be controlled to be recovered to the insulated gas recovery tank.

The microcomputer may determine that the insulating gas does not satisfy the standard condition when the purity of the insulating gas is less than 95%, the concentration is 2 ppm or more, or the moisture content is 1000 ppm or more.

The microcomputer, after the insulating gas contained in the ground equipment is recovered to the insulating gas recovery tank, the second check valve is closed and the third check valve is opened, so that the inside of the ground equipment is opened by the vacuum pump. It can be controlled to be in a vacuum state.

When the inside of the ground equipment is in a vacuum state, the microcomputer may close the third check valve and open the fourth check valve to control the new insulation gas to be injected into the ground equipment from the insulation gas injection tank. Can be.

The ground device is a ground switch, and the insulating gas may be sulfur hexafluoride (SF6).

According to another embodiment of the present invention, in the insulation gas analysis and reinforcement method using the insulation gas analysis and reinforcement system of the ground equipment including the insulation gas, between the connector and the insulation gas analysis tester mounted on the inlet of the ground equipment Opening the first check valve connected to the insulating gas analysis tester, receiving the purity gas, concentration moisture content data from the insulation gas analysis tester, purity of the insulation gas, If at least one of the concentration and water content data does not satisfy the reference condition, the first check valve is closed and a second check valve connected between the connector and the insulating gas recovery tank is opened to insulate the built-in equipment. Controlling gas to be recovered to the insulated gas recovery tank; After the insulation gas built in the air is recovered to the insulation gas recovery tank, the second check valve is closed, and the third check valve connected between the connector and the vacuum pump is opened, and the ground equipment is operated by the vacuum pump. Controlling the inside to be in a vacuum state, and when the inside of the ground apparatus is in a vacuum state, closing the third check valve and opening a fourth check valve connected between the connector and the insulated gas injection tank to insulate the gas. Controlling a new insulating gas to be injected from the injection tank into the ground apparatus.

According to the insulation gas analysis and reinforcement method of the ground equipment according to the present invention, when the insulation gas is leaked or damaged by deterioration due to damage of the ground equipment, the recovery and replacement of the insulation gas can be automatically performed. In addition, since an insulation gas analysis tester, insulation gas recovery tank, vacuum pump and insulation gas injection tank are connected in parallel to one connector, analysis and recovery of insulation gas and supply of new insulation gas are sequentially performed under the control of the microcomputer. The process can be carried out conveniently and smoothly.

In addition, by using the insulation gas recovery tank and vacuum pump sequentially, insulation gas can be recovered more than 99.9%, and it is possible to easily prevent damage by reinforcing the damaged parts without replacing the ground equipment itself. The cost of management and the consumption of manpower can be greatly reduced.

1 is a view showing an insulation gas analysis and reinforcement system of a ground apparatus according to an embodiment of the present invention.
2 is an enlarged view of the ground apparatus according to FIG. 1.
3 is a flowchart illustrating a method for analyzing and reinforcing insulation gas of a ground apparatus according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

1 is a view showing the insulation gas analysis and reinforcement system of the ground apparatus according to an embodiment of the present invention, Figure 2 is an enlarged view showing the ground apparatus according to FIG.

First, the insulation gas analysis and reinforcement system 100 of the ground apparatus according to the embodiment of the present invention as shown in FIG. 1 includes the ground apparatus 110, the connector 120, and the microcomputer 130.

First, the ground device 110 includes all power devices using insulation gas, that is, ground switchgear, overhead line circuit breaker, substation power device, and gas insulation switchgear (GIS). It is a device that controls the opening and closing of the power supply.

The ground device 110 is installed in a protective box (not shown) and is safely managed. And the ground device 110, as shown in Figure 2 is provided with a circuit breaker 111 that requires electrical insulation therein, the circuit breaker 111 to energize or cut off the current according to the load state of the ground device 110 Play a role of The breaker 111 may be filled with an insulating medium such as the insulating gas 112 to ensure stability.

In particular, as the insulating gas 112, sulfur hexafluoride gas (SF6, sulfur hexafluoride, sulfur hexafluoride) is used, and refers to a material having low electrical conductivity and thermal conductivity and hardly passing heat flow.

In addition, the ground device 110 is an insulating gas gauge 113 is attached to the outside, it is possible to measure the filling pressure of the insulating gas 112 inside the ground device (110). Therefore, it is possible to determine whether the leakage of the insulating gas through the filling pressure measured in the insulating gas gauge 113. And the injection hole 114 is connected to the upper end of the ground device 110, it is used during the replacement (recovery and injection) of the insulating gas.

The connector 120 is connected to the inlet 114 of the ground equipment to provide a passage for the insulation gas. The other side of the connector 120 is connected in parallel with the insulation gas analysis tester 140, the insulation gas recovery tank 150, the vacuum pump 160, and the insulation gas injection tank 170, respectively.

Here, the first check valve 121 is connected between the connector 120 and the insulation gas analysis tester 140, and the second check valve 122 is connected between the connector 120 and the insulation gas recovery tank 150. Connected. In addition, a third check valve is connected between the connector 120 and the vacuum pump 160, and a fourth check valve is connected between the connector 120 and the insulating gas injection tank 170.

The microcomputer 130 determines whether to replace the insulating gas 112 in response to the purity, concentration, and moisture content of the insulating gas 112, and when the replacement of the insulating gas is made, the first to fourth checks are performed. The operations of the valves 121, 122, 123, and 124, the insulation gas analysis tester 140, the insulation gas recovery tank 150, the vacuum pump 160, and the insulation gas injection tank 170 are sequentially controlled.

Hereinafter, the insulating gas analysis and reinforcement method of the insulation gas analysis and reinforcement system 100 of the ground apparatus will be described with reference to FIG. 3.

3 is a flowchart illustrating a method for analyzing and reinforcing insulation gas of a ground apparatus according to an exemplary embodiment of the present invention.

Prior to describing the insulation gas analysis and reinforcement method of the ground apparatus according to an embodiment of the present invention, a process of inspecting the state of the ground apparatus in advance will be described.

First, the leakage of the insulating gas 112 included in the ground device 110 and the leakage site is inspected (S310). If the ground device 110 is a ground switch, when the insulation gas gauge 113 is visually checked to check the filling pressure of the insulation gas 112, the pressure of the insulation gas is less than 2.0 psi, for example. In this case, the filling of the insulation gas inside the ground breaker is considered to be insufficient, and there may be a leakage. And visually confirm whether the lack of the insulating gas 112 is caused by leakage in the elbow (Elbow) or other attached parts or the coupling site by welding connected to the electrical insulation box 112 provided therein. And judge.

In addition, it must meet the conditions for the insulation reinforcement work of the ground equipment (110). For example, the open state of the front opening and closing door of the protective box that surrounds and protects the outside of the ground apparatus 110 should be good, and should be secured at least 1.0 m. It should also be possible to open more than 90% of the doors on the front of the enclosure.

Next, the electrical and physical state of the ground apparatus 110 is comprehensively inspected. For example, the inspection of the appearance of the ground equipment 110, the grounding state check (grounding terminal arrangement, grounding state), thermal imaging diagnosis between the terminals of the switchgear, and check the connection state of each elbow is performed. In addition, the area around the leaked portion of the insulating gas 112 is cleaned and cleaned.

Next, a precoat is formed on the leakage portion of the insulating gas 112 to temporarily block the leakage of the insulating gas 112. In other words, after grasping the area to apply the epoxy resin to be described later and the degree of leakage of the insulating gas 112, in order to delay the leakage of the insulating gas 112 and temporarily block it, for example, hard jelly, etc. Form a precoat on the leaked area using. And apply soap bubbles to the leakage blocking area and check until the bubble is not generated. After re-checking whether the pre-coating treatment formed on the leaking part of the ground apparatus 110 is perfect, the subsequent process is performed in a completely dry state.

Next, the forming portion of the precoat is washed with alcohol and then epoxy resin is first applied. Here, an epoxy resin can mix | blend a main material and a hardening material in the ratio of 1: 1, and can apply | coat uniformly to the formation part of a precoat. And it is preferable that the hardened epoxy resin apply | coated within 5 minutes after that.

Then, after confirming the curing of the epoxy resin applied first, the epoxy resin is applied secondly. That is, after approximately 10 minutes have elapsed, the presence or absence of bubbles in the first coating site is confirmed, and when it is confirmed that there is no bubble generation, the second coating is performed in the same manner as the first coating. After the second application, check whether there is any bubble around the leaked area and if it is hardened like pressing a piece of glass when pressed with nails. Here, the epoxy resin used for tertiary coating can mix | blend a main material and a hardening material in the ratio of 1: 1, and can be used.

As such, when the pre-internal leakage check process of the ground apparatus 110 is completed, the microcomputer 130 checks the state of the insulation gas 112 embedded in the ground apparatus 110 to determine whether to replace the insulation gas, If a replacement decision is made, the replacement proceeds.

First, the microcomputer 130 opens the first check valve 121 and transmits a part of the insulation gas 112 embedded in the ground apparatus 110 to the insulation gas analysis tester 140 (S320).

That is, while the first check valve 121 is opened, some of the insulation gas 112 included in the ground apparatus 110 is sent to the insulation gas analysis tester 140, and the insulation gas analysis tester 140 is sent. Purity, concentration, and moisture content are measured to determine a defective state of the insulating gas 112, for example, sulfur hexafluoride gas SF6.

The microcomputer 130 receives the purity, concentration, and moisture data of the insulation gas from the insulation gas analysis tester 140 (S330), and determines whether the insulation gas 112 is defective or good (S340). That is, it is determined whether or not all of the conditions that the purity of the insulating gas is 95% or more, the concentration is less than 2 ppm, and the moisture content is less than 1000 ppm are satisfied, and only when the above conditions are satisfied, the insulating gas 112 is in a good state. Judging by

However, when the purity is less than 95%, the concentration is 2 ppm or more, or the moisture content is 1000 ppm or more, it is determined that the insulating gas is in a bad state, and the replacement decision for the insulating gas is made.

Then, the microcomputer 130 closes the first check valve 121 and opens the second check valve 122, so that the insulating gas 112 embedded in the above-mentioned ground apparatus 110 is separated from the insulating gas recovery tank 150. To recover (S350).

In order to recover the insulating gas, first, the locking device (not shown) of the ground apparatus 110 is opened and the leakage of the insulating gas is prevented by a gas injection jig (JIG) sealedly inserted into the injection hole 114. .

As such, after the insulation gas 112 embedded in the ground apparatus 110 is recovered to the insulation gas recovery tank 150, the microcomputer 130 closes the second check valve 122 and the third check valve ( By opening 123, the inside of the ground equipment is controlled by the vacuum pump 160 to be in a vacuum state (S360).

That is, by setting the power of the vacuum pump 160 to 3KW or more, and by applying a pressure of -1.0kg / cm ² (760mb) or more, so that the insulating gas contained in the ground apparatus 110 is completely recovered, The inside of the ground apparatus 110 to be in a vacuum state.

When the inside of the ground apparatus 110 is in a vacuum state, the microcomputer 130 closes the third check valve 123 and opens the fourth check valve 124 to newly insulate the insulation gas injection tank 170. The gas is controlled to be injected into the ground apparatus 110 (S370).

That is, the microcomputer 130 injects the new insulation gas into the ground apparatus 110 from the insulation gas injection tank 170 until the pressure of the insulation gas becomes, for example, 5.0 psi or more.

After injection of insulation gas, if the results of re-measurement of purity, moisture, and concentration of new insulation gas are judged to be satisfactory as a result of repeating S320 and S330, all work is completed and any of the conditions of purity, moisture, and concentration are not satisfied. In this case, steps S340 to S360 are repeated. In other words, the new insulating singer in the ground equipment 110 is recovered in the same process to re-vacuum and inject the insulating gas confirmed purity, and the above process is repeatedly performed until the specification is satisfied.

Finally, it checks whether there is any abnormality in the connection part through partial discharge or thermal image diagnosis, etc., and when it is finally confirmed that there is no abnormality, the work is completed by rebuilding the front and rear doors of the protective box.

As described above, according to the insulation gas analysis and reinforcement method of the ground apparatus according to the present invention, the insulation gas may be automatically recovered and replaced when the insulation gas is leaked or damaged by deterioration due to damage of the ground apparatus. In addition, since an insulation gas analysis tester, insulation gas recovery tank, vacuum pump and insulation gas injection tank are connected in parallel to one connector, analysis and recovery of insulation gas and supply of new insulation gas are sequentially performed under the control of the microcomputer. The process can be carried out conveniently and smoothly.

In addition, by using the insulation gas recovery tank and vacuum pump sequentially, insulation gas can be recovered more than 99.9%, and it is possible to easily prevent damage by reinforcing the damaged parts without replacing the ground equipment itself. The cost of management and the consumption of manpower can be greatly reduced.

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: insulation gas analysis and reinforcement system,
110: ground equipment, 111: breaker,
112: insulating gas, 113: insulating gas gauge,
114: inlet, 120: connector,
121: first check valve, 122: second check valve,
123: third check valve, 124: fourth check valve,
130: microcomputer, 140: insulation gas analysis tester,
150: insulated gas recovery tank, 160: vacuum pump,
170: insulated gas injection tank

Claims (11)

Includes a circuit breaker inside, the ground equipment is filled with insulating gas around the circuit breaker,
A connector mounted to the inlet of the ground apparatus and connected in parallel with an insulation gas analysis tester, an insulation gas recovery tank, a vacuum pump and an insulation gas injection tank,
It is determined whether to replace the insulating gas in response to the purity, concentration, and water content of the insulating gas, and if the replacement of the insulating gas is determined, the insulating gas analysis tester, insulating gas recovery tank, vacuum pump and insulating gas. Microcomputer to sequentially control the operation of the injection tank, and
Insulation gas analysis of ground equipment including first, second, third and fourth check valves respectively connected between the connector and the insulation gas analysis tester, insulation gas recovery tank, vacuum pump and insulation gas injection tank, respectively. And reinforcement system. delete The method according to claim 1,
The microcomputer,
Opening the first check valve to control the insulation gas to be sent to the insulation gas analyzer;
Insulation gas analysis and reinforcement system of the ground equipment for receiving the purity, concentration moisture content data of the insulation gas sent from the insulation gas analysis tester. The method according to claim 3,
The microcomputer,
If at least one of the purity, concentration and moisture content data of the insulating gas does not satisfy the reference conditions,
Insulating gas analysis and reinforcement system of the ground equipment to close the first check valve and to open the second check valve to recover the insulating gas built in the ground equipment to the insulating gas recovery tank. The method of claim 4,
The microcomputer,
Insulation gas analysis and reinforcement system for ground equipment that determines that the insulation gas does not meet the standard conditions when the purity of the insulation gas is less than 95%, the concentration is more than 2ppm, or the moisture content is more than 1000ppm. The method of claim 4,
The microcomputer,
After the insulating gas built in the ground equipment is recovered to the insulating gas recovery tank,
Insulating gas analysis and reinforcement system of the ground equipment by closing the second check valve and opening the third check valve, the vacuum pump to control the inside of the ground equipment to a vacuum state. The method of claim 6,
The microcomputer,
When the inside of the ground equipment is in a vacuum state,
Insulating gas analysis and reinforcement system of a ground equipment to close the third check valve and open the fourth check valve to control the new insulating gas is injected into the ground equipment from the insulating gas injection tank. The method according to claim 1,
The ground equipment is a ground switch,
The insulation gas is sulfur hexafluoride gas (SF6, Sulfur hexafluoride) is an insulation gas analysis and reinforcement system of the ground equipment. In the insulation gas analysis and reinforcement method using the insulation gas analysis and reinforcement system of the ground equipment,
Sending the insulation gas to the insulation gas analysis tester by opening a first check valve connected between the connector mounted on the inlet of the ground apparatus including the insulation gas and the insulation gas analysis tester;
Receiving purity and concentration moisture content data of the insulation gas from the insulation gas analysis tester;
If at least one of the purity, concentration, and moisture content data of the insulation gas does not satisfy the reference condition, the first check valve is closed and a second check valve connected between the connector and the insulation gas recovery tank is opened. Controlling to recover the insulation gas built into the ground apparatus to the insulation gas recovery tank;
After the insulation gas built in the ground equipment is recovered to the insulation gas recovery tank, the second check valve is closed, and the third check valve connected between the connector and the vacuum pump is opened to be opened by the vacuum pump. Controlling the inside of the ground apparatus to be in a vacuum state, and
When the inside of the ground equipment is in a vacuum state, the third check valve is closed and a fourth check valve connected between the connector and the insulation gas injection tank is opened so that new insulation gas from the insulation gas injection tank is transferred to the ground equipment. Controlling to be injected;
And the insulation gas analysis tester, the insulation gas recovery tank, the vacuum pump and the insulation gas injection tank are connected to the ground equipment in parallel. The method according to claim 9,
Insulation gas analysis and reinforcement method of the above-mentioned ground equipment to determine that the insulation gas does not satisfy the standard conditions when the purity of the insulation gas is less than 95%, the concentration is 2ppm or more, or the moisture content is 1000ppm or more. The method according to claim 9,
The ground equipment is a ground switch,
The insulation gas is sulfur hexafluoride gas (SF6, Sulfur hexafluoride) is an insulation gas analysis and reinforcement method of the ground equipment.

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