KR101578289B1 - System for error operation prevent of air pressure operation type circuit-breakers - Google Patents

Abstract

A pneumatic operation type breaker air current malfunction prevention system is disclosed. A pneumatic operation type breaker air current malfunction prevention system according to an embodiment of the present invention includes: a freezer-type dryer for cooling compressed air introduced from an air compressor to a predetermined temperature; And a heatless purge type air dryer connected to the freeze-type dryer, wherein the cooled compressed air cooled through the freeze-type dryer is formed into super-dry compressed air dried at a dew point of -65 ° C using a moisture absorbent Air Dryer).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker,

More particularly, the present invention relates to a system for preventing malfunction of a pneumatic operation type breaker, and more particularly, to a system and a method for preventing malfunction of a breaker from occurring due to impurities such as moisture during the generation of compressed air, The present invention relates to a pneumatic actuation system breaker air current malfunction prevention system that can prevent a malfunction of the air flow.

Air-operated shutoff currents (GIS, GCB) currently in operation are not suitable for domestic climate conditions.

The reason for this is not only the annual yellow sand phenomenon, but also the fact that yellow sand is continuously contained in the yellow sand due to the industrial development of China.

It is known that such polluted air causes fatal damage to the breaker of electric power facilities.

First of all, it is urgent to supplement the measures against the increase of yellow dust phenomenon and the increase of air pollution caused by yellow dust in recent years.

As China's second industry grew rapidly, sandstorms, which were mainly composed of silica sand, remained in the GIS & GCB operation part of the air-operated operation mode, which is now in operation, due to the generation of fine dust including heavy metals. Or the fastening phenomenon of Greece.

Next, the occurrence of contamination inside the breaker operating portion is increasing.

Since the precise operating mechanism of the circuit breaker compresses the air which adversely affects as it is, the inside of the precision operating unit is seriously damaged by the oxidation and corrosion of grease, so that an important trip (TRIP) of the circuit breaker is delayed, And it is likely to occur more frequently in the future.

Lastly, it is necessary to supplement the excessive water intrusion in the summer.

If there is a lot of humidity during the summer, if the compressor is operated frequently due to the pressure drop and the water accumulates inside the operating mechanism and freezes in the winter season, there is a possibility of misoperation by moving the pilot V / V without the TRIP command Do.

In fact, these issues are reported to be more likely to occur more frequently in the future unless climate conditions change.

Hereinafter, the phenomenon and problems of the compressed air blocking system currently under application are summarized as follows.

First, in the case of the existing technology, there is a problem that a negative action occurs.

1 to 3, the driving force directly required for the closing or closing operation of the circuit breaker is an operation method using compressed air. Due to moisture present in the compressed air, There is a problem that the mechanical operation part does not operate properly due to the lubricant sticking to the inside and the main valve, the operation cylinder, the piston and the like and interacts with the lubricant.

Second, in the case of existing technology, there is a problem that delay block is generated due to the structural limit.

Considering these problems, it is possible to consider replacing the current pneumatic operation method with a hydraulic method or another method, but since it is not practical, it is possible to prevent the malfunction of the pneumatic operation method breaker airflow, There is a need to build a stable system that can eliminate the problem.

Accordingly, the present applicant has filed an application for an improvement technique for a malfunction prevention system for an air-operated operating breaker, through Korean Patent Application No. 10-2007-0072219, but it has been proposed to improve the technology It came.

Korea Patent Office Application No. 10-2007-0072219

An object of the present invention is to provide an air pressure operated breaker air current malfunction prevention system that can prevent impairment of operation of the breaker or delayed interruption due to pipeline freezing and breakage of the main valve by sticking and fixing of the breaker, will be.

The object is achieved by a refrigeration type refrigerator comprising: a freezing dryer for cooling compressed air introduced from an air compressor to a predetermined temperature; And a heatless purge type air dryer connected to the freeze-type dryer, wherein the cooled compressed air cooled through the freeze-type dryer is formed into super-dry compressed air dried to a minimum dew point of -65 ° C. by using a moisture absorbent And an air dryer (not shown).

The refrigeration type dryer includes a first heat exchanger for cooling the temperature of the compressed air compressed in the air compressor to -40 ° C or lower; And a second heat exchanger connected to the first heat exchanger and collecting and discharging the condensed water in the cooled compressed air cooled to -40 ° C or lower.

The main filter may further include a main filter disposed between the first heat exchanger and the second heat exchanger and filtering the foreign substances in the cooled compressed air cooled by the first heat exchanger to 5 μm or less.

A pre-filter disposed between the freeze-type drier and the heatless purge-type air dryer for filtering foreign matter in compressed air passing through the freeze-type dryer to 1 μm or less.

The heatless purge-type air dryer may further include a line filter for filtering the compressed air to 1 m or less with respect to the compressed air.

The line filter may further include an after filter for filtering the compressed air to 0.01 mu m with respect to the compressed air and sending the filtered air to the circuit breaker.

The hygroscopic agent may be activated alumina or synthetic zeolite, and the heatless purge type air dryer may dry the compressed air so that the air moisture content is 6 ppm or less.

A first valve provided in a first line through which compressed air flows from the air compressor to the freezer dryer; A second valve provided in a second line through which compressed air flows from the heatless purge type air dryer to the circuit breaker; And a third valve provided on a third line connecting the first line and the second line.

And a temperature sensor provided in the second line for sensing the temperature of the compressed air flowing into the second line.

And a controller for selectively controlling the operation of the first to third valves based on the information of the temperature sensor.

According to the present invention, impurities such as moisture are included in the production of compressed air, thereby preventing defective operation of the breaker or delayed interruption due to piping freezing and breakage of the main valve by the main valve.

According to the present invention, it is possible to prevent malfunction of the pneumatic operation type shutoff air flow by removing fine dust and oil / moisture of the compressed air flowing from the air compressor through a simpler and more efficient structure than before and drying it, It is possible to prevent an enormous damage caused by a malfunction and extend the reliability and life of the precision operating mechanism.

Further, according to the present invention, the problem of the operation method of the breaker by the compressed air can be solved, and the spread of the breaker to the wide power failure can be prevented in advance by preventing the breaker delay block.

FIG. 1 is a chart of the delayed shutdown cases occurring from 2006 to 2013.
Fig. 2 shows the breakdown of the number of delayed shutdowns occurring during the period from 2006 to 2011 according to each component.
Fig. 3 is an image corresponding to Fig.
4 is a configuration diagram of a pneumatic operation interrupter airflow malfunction prevention system according to the first embodiment of the present invention.
5 is a control block diagram of Fig.
6 is a configuration diagram of a pneumatic operation interrupter airflow malfunction prevention system according to a second embodiment of the present invention.
FIG. 7 is a control block diagram of FIG. 6. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

The meaning of the terms described in the present invention should be understood as follows.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present invention.

Embodiments of the present invention will now be described in detail with reference to the drawings. In the description of the embodiments, the same components are denoted by the same reference numerals.

FIG. 4 is a block diagram of a malfunction preventing system for a pneumatic operation type breaker according to the first embodiment of the present invention, and FIG. 5 is a control block diagram of FIG.

Referring to these drawings, the pneumatic operation type breaker air current malfunction prevention system according to the present embodiment includes impurities such as moisture during the generation of compressed air, thereby preventing the malfunction of the breaker or the delayed interruption due to piping freezing and sticking of the main valve of the breaker And includes a freeze dryer 110 and a heatless purge type air dryer 130. As shown in FIG.

Particularly, the pneumatic operation-type breaker air current malfunction prevention system according to the present embodiment filters the compressed air and discharges the super-dry compressed air that has been dried to a desired ultra-pure air, for example, It is possible to prevent erroneous operation in case of emergency due to rapid corrosion of compressed air lines, shortened life span of various pneumatic operated devices, and deterioration of functions due to various impurities sucked into / from the system when sucking and humid air in the air is pressurized by air compressors .

The freezer-type dryer 110 serves to cool the compressed air introduced from the air compressor to a predetermined temperature.

In this embodiment, the refrigeration type dryer 110 includes a first heat exchanger 111 for cooling the compressed air introduced into the air compressor to -40 ° C or lower, a second heat exchanger 111 connected to the first heat exchanger 111, And a second heat exchanger (112) for collecting and discharging the condensed water in the cooled compressed air cooled to -40 占 폚 or lower.

The refrigerant dryer 110 is divided into a first heat exchanger 111 and a second heat exchanger 112. The refrigerant passes through the first heat exchanger 111 and then passes through the first heat exchanger 111 and the second heat exchanger 112, So that only the dry compressed air can be applied.

Only such dry compressed air can be applied to help prevent condensation.

On the other hand, there is a limit in the malfunction prevention system of the present embodiment, which requires completely dry air, as the freezer-type dryer 110.

In other words, the heatless fuzzy type air dryer 130 must be applied together with the compressed air in order to supply the super dry compressed air.

The heatless purge type air dryer 130 is connected to the freeze dryer 110. The cooled compressed air that has been cooled through the freeze dryer 110 is dried using a desiccant at a dew point of -65 deg. As shown in FIG.

However, in Korea, the operating pressure is 9.9kgf / ㎠G low and the dew point is -40 ℃, which makes it difficult to use the heatless type dryer.

However, the heatless purge-type air dryer 130 applied in this embodiment absorbs moisture using a desiccant such as activated alumina or synthetic zeolite. At this time, the moisture content of air should be 6 ppm or less.

For reference, the moisture absorbent may be, for example, molecular sieves or the like. Molecular sieves are synthesized zeolites having uniform pore diameters as one of the adsorbents (or hygroscopic agents).

The Heatless Purge Type Air Dryer (130) removes the moisture that is absorbed by the air, automatically discharges it to the lower electronic side by using the internal drying air through the PLC control without using heat. The function to recover the function.

Although not shown in detail for the heatless purge type air dryer 130, the heatless purge type air dryer 130 applied to the present embodiment can utilize the merits of molecular sieves, It is possible to meet the requirement of the required dew point of -65 ° C by mixing the filling of the tower using the moisture absorption rate.

In addition, the appearance housing design can be designed to 18kgf / ㎠G so that 16kgf / ㎠G can be used according to CB (Breaker) pressure of GIS (Gas Insulated Switchgear).

On the other hand, when the air is sucked and compressed by the air compressor, there is steam, dust and various contaminants in the air, and the oxidation or carbonization phenomenon is generated by the chemical reaction due to the high temperature frictional heat, and a large amount of oil mist is generated.

Such compressed air may cause rust and corrosive substances in the process of passing through the piping, which may cause failure of CB (breaker) of GIS (gas insulated switchgear) using compressed air.

Therefore, in order to obtain clean and dry compressed air, the filter must be installed. However, considering the size of the foreign matter and the frictional loss of the compressed air, the filter can be designed within a range that does not affect the circuit breaker of the substation.

A main filter 121, a pre-filter 122, a line filter 123, and an after filter 124 are applied to the malfunction prevention system of this embodiment.

The main filter 121 is disposed between the first heat exchanger 111 and the second heat exchanger 112 and filters foreign substances in the cooled compressed air cooled by the first heat exchanger 111 to 5 μm or less .

The pre-filter 122 is disposed between the freezer-type dryer 110 and the heatless purge-type air dryer 130 and is connected to the second heat exchanger 112 of the freezer- And serves to filter foreign matter to 1 μm or less.

The line filter 123 functions to filter the heatless purge-type air dryer 130 to 1 μm or less with respect to the compressed air that has passed through the heatless purge-type air dryer 130.

The after filter 124 filters out the compressed air having passed through the line filter 123 to 0.01 mu m and sends it to the circuit breaker.

In addition, in addition to these configurations, the pneumatic operation interrupter air leakage preventive system according to the present embodiment includes a first valve (V1) provided in a first line (L1) through which compressed air flows from the air compressor to the freeze dryer (110) A second valve V2 provided in a second line L2 through which the compressed air flows from the heatless purge type air dryer 130 to the circuit breaker and a second valve V2 provided in the first line L1 and the second line L2 And a third valve (V3) provided in the third line (L3) for connection.

All of the first to third valves V1 to V3 can be individually controlled by the controller 150 according to the amount of compressed air supplied to the circuit breaker.

The controller 150 that performs such a role may include a central processing unit 151, a memory 152, a memory 152, and a support circuit 153, as shown in FIG.

The central processing unit 151 is one of various computer processors that can be industrially applied to individually control the first to third valves V1 to V3 according to the amount of compressed air supplied to the circuit breaker in this embodiment .

The memory 152 (MEMORY) is connected to the central processing unit 151. The memory 152 may be a computer-readable recording medium and may be located locally or remotely, and may be any of various types of storage devices, such as random access memory (RAM), read-only memory (ROM), floppy disk, hard disk, At least one or more memories.

A support circuit 153 (SUPPORT CIRCUIT) is coupled with the central processing unit 151 to support the typical operation of the processor. Such a support circuit 153 may include a cache, a power supply, a clock circuit, an input / output circuit, a subsystem, and the like.

In this embodiment, the controller 150 individually controls the first to third valves V1 to V3 according to the amount of compressed air supplied to the circuit breaker. At this time, a series of processes or the like for individually controlling the first to third valves V1 to V3 according to the amount of compressed air supplied to the breaker by the controller 150 may be stored in the memory 152. [ Typically, a software routine may be stored in the memory 152. The software routines may also be stored or executed by other central processing units (not shown).

Although processes according to the present invention are described as being performed by software routines, it is also possible that at least some of the processes of the present invention may be performed by hardware. As such, the processes of the present invention may be implemented in software executed on a computer system, or in hardware such as an integrated circuit, or in combination of software and hardware.

Hereinafter, the operation of the pneumatic operation-type breaker air current malfunction prevention system according to the present embodiment will be described.

First, the temperature of the compressed air that is compressed and introduced into the air compressor is cooled down to -40 ° C or less in the first heat exchanger 111 of the freeze dryer 110.

The cooled compressed air cooled in the first heat exchanger (111) passes through the main filter (121) and is filtered to 5 탆 or less.

Next, the cooled compressed air filtered to a size of 5 탆 or less passes through the second heat exchanger (112) of the freeze dryer (110) and is again cooled by heat exchange. At this time, To maintain the dried state.

The cooled and dried compressed air passing through the second heat exchanger (112) passes through the pre-filter (122) and is further filtered to 1 탆 or less.

On the other hand, the cooled dry compressed air filtered through the prefilter 122 to a depth of 1 mu m or less reaches the heatless purge-type air dryer 130, and the moisture in the heatless purge-type air dryer 130 is almost completely Absorbed. At this time, the air moisture content is set to 6 ppm or less, and the air is formed into super dry compressed air dried at a dew point of -65 ° C.

Particularly, in the case of the present embodiment, the heatless purge type air dryer 130 has a method of removing moisture adsorbed (absorbed) by automatically discharging the dry air through the PLC control to the lower electromagnetic valve without using heat Method is applied.

Next, in consideration of the fact that foreign substances of molecular sieves can flow out again into the compressed air passing through the heatless purge type air dryer 130, the compressed air is filtered to 1 μm or less from the line filter 123 .

Then, by passing through the after-filter 124 and finally filtering to 0.01 mu m, it can be sent to the super-dry compressed air breaker required in the process.

According to the present embodiment having such a structure and action, impurities such as moisture can be included in the production of compressed air, thereby preventing defective operation of the breaker or delayed interruption due to piping freezing and sticking of the main valve of the breaker.

According to this embodiment, it is possible to prevent malfunction of the pneumatic operation type shutoff air flow by removing minute dust and oil / moisture of the compressed air flowing from the air compressor through a simpler and more efficient structure than before. It is possible to prevent an enormous damage caused by a malfunction and to extend the reliability and life of the precision operating mechanism.

In addition, according to the present embodiment, the problem of the operation method of the breaker by the compressed air can be solved, so that the spread of the breaker to the wide power failure can be prevented in advance by preventing the breaker delay block.

FIG. 6 is a block diagram of a pneumatic operation-type breaker air current malfunction prevention system according to a second embodiment of the present invention, and FIG. 7 is a control block diagram of FIG.

Referring to these drawings, a temperature sensor 260 is further included in the air-operated operation breaker air current malfunction prevention system according to the present embodiment.

The temperature sensor 260 detects the temperature of the compressed air that is provided in the second line L2 and flows to the second line L2.

When such a temperature sensor 260 is provided, the controller 250 can selectively control the operation of the first to third valves V1 to V3 based on the information of the temperature sensor 260. [

For example, if the temperature of the compressed air flowing through the second line L2 to the breaker is not reached to the dew point -65 占 폚, the third valve V3 may be opened again to feed the compressed air forward in the process.

In this case, the second line L2 may further include a drying degree sensor (not shown) for detecting the degree of drying of the compressed air. The controller 250 may include a temperature sensor 260, By selectively controlling the operation of the first to third valves V1 to V3 on the basis of the information, it is essential that the air is directed to the circuit breaker in a state other than the super- .

Even when the structure of the present embodiment is applied, impurities such as moisture can be contained in the production of compressed air, thereby preventing defective operation of the breaker or delayed interruption due to piping freezing and sticking of the main valve of the breaker.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

110: Refrigerated dryer 111: First heat exchanger
112: second heat exchanger 121: main filter
122: prefilter 123: line filter
124: after filter
130: Heatless purge type air dryer
150: controller

Claims (10)

A freezing dryer for cooling compressed air flowing from an air compressor to a predetermined temperature;
The compressed air, which is connected to the freezer-type dryer and cooled through the freezer-type dryer, is dried using a desiccant made of molecular sieves to a dew point of -65 ° C, Heatless purge type air dryer;
A first valve provided in a first line through which compressed air flows from the air compressor to the freezer dryer;
A second valve provided in a second line through which compressed air flows from the heatless purge type air dryer to the circuit breaker; And
Further comprising a third valve provided on a third line connecting the first line and the second line.
The method according to claim 1,
The refrigeration type drier comprises:
A first heat exchanger for cooling the compressed air introduced into the air compressor to -40 ° C or lower; And
And a second heat exchanger connected to the first heat exchanger and collecting and discharging the condensed water in the cooled compressed air cooled to -40 ° C or lower.
3. The method of claim 2,
Further comprising a main filter disposed between the first heat exchanger and the second heat exchanger for filtering the foreign substances in the cooled compressed air cooled by the first heat exchanger to 5 μm or less, Operation method Breaker air flow malfunction prevention system.
The method according to claim 1,
Further comprising a pre-filter disposed between the freeze-type drier and the heatless purge-type air dryer for filtering the foreign matter in the compressed air passing through the freeze-type dryer to 1 μm or less. Operation method Breaker air flow malfunction prevention system.
The method according to claim 1,
Further comprising a line filter for filtering the foreign substances in the compressed air passing through the heatless purge type air dryer to 1 mu m or less.
delete The method according to claim 1,
The desiccant is activated alumina or synthetic zeolite,
Wherein the heatless purge type air dryer is configured to dry the compressed air so that the moisture content of the air is 6 ppm or less.
delete The method according to claim 1,
Further comprising a temperature sensor provided in the second line for sensing the temperature of the compressed air flowing into the second line.
10. The method of claim 9,
Further comprising a controller for selectively controlling operations of the first to third valves based on information of the temperature sensor.

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