KR20170019545A - Apparatus for partial dishcarge detection to power equipment - Google Patents

Apparatus for partial dishcarge detection to power equipment Download PDF

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Publication number
KR20170019545A
KR20170019545A KR1020150113240A KR20150113240A KR20170019545A KR 20170019545 A KR20170019545 A KR 20170019545A KR 1020150113240 A KR1020150113240 A KR 1020150113240A KR 20150113240 A KR20150113240 A KR 20150113240A KR 20170019545 A KR20170019545 A KR 20170019545A
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South Korea
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pattern
high frequency
partial discharge
analysis result
signal
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KR1020150113240A
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Korean (ko)
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KR101762356B1 (en
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이지훈
서덕기
이지혜
김종화
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한전케이디엔주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

An apparatus for detecting a partial discharge of a power facility is disclosed. The apparatus for detecting a partial discharge of a power facility includes: an ultra high frequency sensor which is installed in the power facility and detects an ultra high frequency signal; a gas sensor which is installed in the power facility and detects a gas ingredient signal; an ultra high frequency signal analyzing unit which analyzes a ripple shape of the ultra high frequency signal; a gas ingredient analyzing unit which compares a pattern of the gas ingredient signal with a previously stored pattern by analyzing the pattern of the gas ingredient signal; and a partial discharge detecting unit which detects whether the partial discharge is generated by using a first analysis result of the ultra high frequency signal analyzing unit and a second analysis result of the gas ingredient analyzing unit. Accordingly, the present invention can determine whether the partial discharge is generated by using the gas ingredient analysis result and the ultra high frequency signal.

Description

[0001] APPARATUS FOR PARTIAL DISCHARGE DETECTION TO POWER EQUIPMENT [0002]

The present invention relates to a power plant partial discharge detection apparatus.

Generally, with the increase of electric power demand, transformers and underground cables using current transformers (CT) are becoming larger and higher in pressure, and substations are becoming unmanned.

When an accident occurs in such a large capacity transformer or underground cable, the ripple effects are wide, the economic loss and psychological anxiety become large, and the necessity of the insulation diagnosis for preventing the accident of the transformer or the underground cable is increasing.

Recently, in order to secure the reliability of transformer and underground cable and to supply electric power stably, there has been developed a constant monitoring device for always measuring signs of an internal defect at the time of an operation of a transformer or an underground cable.

The data of the continuous monitoring device is continuously stored, and it is judged whether the internal defect progresses due to the increasing tendency. The type of the defect is determined by the correlation between the detected data. If the indication of the defect advances, A preventive diagnosis system has been developed for stopping and taking countermeasures.

On-line fault detection technologies applied to constant monitoring of transformers and underground cables include gas analysis technology, partial discharge measurement technology, and temperature measurement technology in transformer insulation oil, in-ground OF cable connection box. Here, it has been recognized that the internal insulation fault, which is a serious accident factor of a transformer or an underground cable, is accompanied by a partial discharge, so that there is a strong correlation between the partial discharge and the life of the transformer or the underground cable.

The long-term tracking method through the analysis of the gas generated when the partial discharge due to the insulation deterioration occurs is regularly used due to the accuracy despite the difficulty in the measurement, but the information for troubleshooting after the fault is not provided.

On the other hand, the partial discharge very high frequency measurement method can obtain the information of the fault location due to the position estimation function. However, due to the reliability limit, the portable type is generally used rather than online.

However, conventionally, in the gas analysis, a method of determining whether a partial discharge is generated using only the simple content of the C2H2 component and a method of determining a partial discharge by calculating only a maximum size and a phase value of a signal by low sampling (32 samples / cycle) Method. Further, since the gas analysis method and the method of using the high frequency signal are used individually, there is a problem that the interconnectivity is low and the reliability of the partial discharge judgment is low.

An object of the present invention is to provide a power plant partial discharge detection apparatus capable of determining whether a partial discharge is generated by using analysis results of a very high frequency signal and a gas component generated in a transformer or an underground cable connection box.

According to an aspect of the present invention, there is provided a microwave oven comprising: a microwave sensor installed in a transformer or an underground cable connection box for detecting a microwave signal; A gas sensor installed in the transformer or an underground cable connection box for detecting a gas component signal; A very high frequency signal analyzer for analyzing a ripple type of the very high frequency signal; A gas component analyzer for analyzing a pattern of the gas component signal and comparing the pattern with a pre-stored pattern; And a partial discharge detector for detecting whether a partial discharge is generated using the first analysis result of the microwave signal analyzer and the second analysis result of the gas component analyzer.

The ultra-high frequency signal analyzing unit may include: a sampling unit for sampling the very high frequency signal; A modulator for enveloping the sampled very high frequency signal; And a ripple analyzing unit for detecting ripple number and ripple duration of the enveloped very high frequency signal and outputting the first analysis result.

The ripple analyzing unit may output a first analysis result that determines that a partial discharge has occurred in the transformer or the underground cable connection box when the number of ripples and the ripple duration are out of a preset range.

The sampling unit may sample the very high frequency signal at a sampling rate of 100 Msampling / second or more.

The sampling unit may change the sampling rate to a higher value when it is determined that the second analysis result does not match the first analysis result.

Wherein the gas component analyzer comprises: a component classifier for selecting at least one gas component from the group consisting of C2H2 and H2, CH4, C2H4 and C2H6 in the gas component signal; And a pattern analyzer for comparing the signal pattern of the gas component selected by the component classifying unit with a previously stored signal pattern and outputting the second analysis result according to matching.

Wherein the pattern analyzing unit outputs a second analysis result that determines that a partial discharge has occurred in the transformer or the underground cable connection box when a signal pattern of a gas component more than half of the gas components selected by the component classifying unit matches a previously stored signal pattern .

And an updating unit for editing or updating the signal pattern stored in the pattern storage unit according to the determination result of the partial discharge detection unit, have.

The updating unit may update the pre-stored signal pattern used for the second analysis result when the first analysis result indicates that the partial discharge has not occurred, when the second analysis result indicates that the partial discharge has occurred It can be discarded by counting a certain number of times.

The present invention can detect whether a partial discharge is generated by using a result of analyzing a very high frequency signal and a gas component generated in a transformer or an underground cable connection box.

Further, the partial discharge signal generated in the high frequency band can be detected, and the gas component pattern can be diagnosed and discarded by itself, thereby providing a highly reliable partial discharge diagnosis result.

1 is a block diagram of a power plant partial discharge detecting apparatus according to an embodiment of the present invention;
2 is a block diagram of a very high frequency signal analyzing unit according to an embodiment of the present invention.
3 is a view for explaining the operation of a very high frequency signal analyzer according to an embodiment of the present invention.
4 is a block diagram of a gas component analyzer according to an embodiment of the present invention.
5 is a view for explaining the operation of the gas component analyzer according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a block diagram of a power plant partial discharge detection apparatus according to an embodiment of the present invention. 1, a transformer partial discharge detecting apparatus according to an embodiment of the present invention includes a microwave sensor 110, a gas sensor 120, a very high-voltage signal analysis unit 210, a gas component analysis unit 220, And a discharge detector (300).

First, the microwave sensor 110 is installed in a transformer or an underground cable connection box to detect a very high frequency signal. The ultra-high frequency sensor 110 may be, for example, a high frequency current transformer (HFCT), and can detect a very high frequency signal generated in a transformer or an underground cable by being installed in a ground portion of a transformer, have. The microwave sensor (110) transmits the detected microwave signal to the microwave signal analyzer (210).

The gas sensor 120 is installed in a transformer or an underground cable connection box to detect a gas component signal. The gas sensor 120 may be composed of, for example, an oxide semiconductor device, and may be installed on the drain valve side of the transformer or in the underground cable connection box to detect gas component signals inside the equipment. The gas sensor 120 transmits the detected gas component signal to the gas component analyzer 220.

The very high frequency signal analyzer 210 analyzes the ripple type of the very high frequency signal and transmits the first analysis result to the partial discharge detector 300.

FIG. 2 is a block diagram of a very high frequency signal analyzing unit according to an embodiment of the present invention, and FIG. 3 is a view for explaining operations of a very high frequency signal analyzing unit according to an embodiment of the present invention.

Referring to FIGS. 2 and 3, the RF signal analyzer 210 may include a sampling unit 211, a modulator 212, and a ripple analyzer 213.

The sampling unit 211 samples the very high frequency signal detected by the very high frequency sensor 110 at a predetermined sampling rate. The sampling unit 211 samples and outputs the microwave signal at a sampling rate of, for example, 100 Msampling / second or more. The sampling rate of the sampling unit 211 may be set to a speed at least two times the maximum frequency of the very high frequency signal detected at the very high frequency. The sampling unit 211 according to an embodiment of the present invention performs a pre-operation for detecting a partial discharge signal over a wide frequency band by performing fast sampling according to the sampling rate as described above.

In addition, the sampling unit 211 can change the sampling rate to a higher value when it is determined that the first analysis result and the second analysis result do not match. If the first analysis result and the second analysis result are inconsistent with each other, whether the partial discharge is generated or not is determined, the sampling rate is changed so as to re-determine whether or not the partial discharge is generated for the very high frequency signal do.

The modulator 212 performs an envelope operation on the sampled very high frequency signal. The modulator 212 connects the ends of the discrete data of the sampled super-high-frequency signals to each other to cover the waveform, and performs an enveloping process.

The ripple analyzer 213 detects the ripple number and the ripple duration of the enveloped very high frequency signal and outputs the first analysis result. The ripple analyzer 213 determines that a partial discharge has occurred in the transformer or underground cable connection box when the number of ripples and the ripple duration are out of a preset range.

The ripple analyzer 213 determines that the partial discharge has occurred in the transformer or underground cable connection box when the number of ripples of the enveloped very high frequency signal is larger than the predetermined value and the duration of the ripple is longer than the preset time. The ripple analyzing unit 213 defines a ripple period when the enveloped RF signal is irregularly modulated for a certain period of time. The duration of the corresponding period is defined as a ripple duration, a pulse number between the maximum value and the minimum value Can be defined as the number of ripples.

The ripple analyzing unit 213 can determine the number of ripples through the number of times the ripple is repeated based on the set value. The ripple analyzing unit 213 can determine the number of times of the round trip based on '0' as the ripple number 1, for example, when the set value is '0'.

When a partial discharge occurs in a transformer or an underground cable connection box, a ripple phenomenon due to resonance is detected in a very high frequency signal. If the ripple phenomenon occurs more than a certain number of times or lasts more than a predetermined time, It can be used as data. Therefore, the ripple analyzer 213 according to an embodiment of the present invention can determine whether a partial discharge has occurred by comparing the number of ripples and the ripple duration with a predetermined range. If the sampling rate is increased, can do.

Referring again to FIG. 1, the gas component analyzer 220 analyzes a pattern of a gas component signal, compares the pattern with a previously stored pattern, and outputs a second analysis result to the partial discharge detector 300.

FIG. 4 is a block diagram of a gas component analyzer according to an embodiment of the present invention, and FIG. 5 is a view for explaining an operation of a gas component analyzer according to an embodiment of the present invention.

4 and 5, the gas component analyzer 220 according to an exemplary embodiment of the present invention includes a component classifier 221, a pattern analyzer 222, a pattern storage 223, and an update unit 224, As shown in FIG.

The component classifying section 221 selects at least one gas component from the group consisting of C 2 H 2 , H 2 , CH 4 , C 2 H 4 and C 2 H 6 in the gas component signal. Among the gas component signals detected by the gas sensor 120, the component classifying unit 221 classifies C 2 H 2 components and H 2 , CH 4 , C 2 H 4, and C 2 H 6 , At least one gas component is selected from the group. The reliability of the second analysis result is improved as the type of the gas component selected by the component classifying unit 221 is varied and the types and the number of the selected gas components are changed according to the external setting or the control of the partial discharge detecting unit 300 .

The pattern analyzer 222 compares the signal pattern of the gas component selected by the component classifier 221 with the previously stored signal pattern, and outputs the second analysis result according to the matching. 4, the pattern analyzer 222 outputs the patterns of the gas components C 2 H 2 and H 2 , CH 4 , and C 2 H 4 selected by the component classifying unit 221 to the pattern storage unit 223 Compare with the pattern. The pattern analyzer 222 may determine that a partial discharge has occurred when the signal pattern and the currently measured gas component signal pattern are matched.

At this time, when the signal pattern of the gas component of more than half of the gas components selected by the component classifying unit 221 is matched with the pre-stored signal pattern, the pattern analyzing unit 222 determines that the partial discharge is generated in the transformer, Can be output. That is, even if the patterns of all the gas component signals do not coincide, it can be judged that the partial discharge is generated in the transformer or underground cable connection box if the signal pattern of more than half of the selected gas components coincides with the grounded signal pattern.

Alternatively, if the signal pattern of at least one of the gas components C 2 H 2 and the remaining gas components among the gas components selected by the component classifying unit 221 is matched with the pre-stored signal pattern, It is possible to output a second analysis result in which it is determined that a partial discharge has occurred in the connection box. That is, the pattern analyzer 222 determines that a partial discharge has occurred in the transformer or underground cable connection box when at least one of the C 2 H 2 component and the remaining component coincide with each other in determining the partial discharge .

The pattern storage unit 223 stores the signal pattern of the gas component when the partial discharge occurs.

The update unit 224 edits or updates the signal pattern stored in the pattern storage unit according to the determination result of the partial discharge detection unit. For example, in the case where it is determined that the partial discharge has occurred in the second analysis result, when the first analysis result is judged that the partial discharge has not occurred, the updating unit 224 updates the period The stored signal pattern can be counted and discarded a predetermined number of times. That is, if the second analysis result and the first analysis result do not coincide with each other, the updating unit 224 counts the signal pattern used in the calculation of the second analysis result. If the counting number exceeds the predetermined number, It can be discarded.

Referring to FIG. 1 again, the partial discharge detector 300 may detect whether partial discharge has occurred by using the first analysis result of the very high frequency signal analyzer 210 and the second analysis result of the gas component analyzer 220 . The partial discharge detector 300 determines that a partial discharge has occurred in the transformer or underground cable connection box when the first analysis result and the second analysis result indicate that the partial discharge has occurred. When the first analysis result and the second analysis result do not match, the partial discharge detector 300 outputs a feedback signal to the microwave signal analyzer 210 and the gas component analyzer 220, and the microwave signal analyzer 210 ) And the gas component analyzer 220 can perform operations such as adjusting the sampling rate, changing the type of gas to be selected, or updating the signal pattern in accordance with the feedback signal.

As used in this embodiment, the term " portion " refers to a hardware component such as software or an FPGA (field-programmable gate array) or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

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 present invention as defined by the following claims It can be understood that

110: Very high frequency sensor
120: Gas sensor
210: a very high frequency signal analysis unit
220: Gas component analysis unit
300: partial discharge detector

Claims (9)

A microwave sensor installed in a power facility for detecting a very high frequency signal;
A gas sensor installed in the electric power facility to detect a gas component signal;
A very high frequency signal analyzer for analyzing a ripple type of the very high frequency signal;
A gas component analyzer for analyzing a pattern of the gas component signal and comparing the pattern with a pre-stored pattern; And
And a partial discharge detector for detecting whether a partial discharge is generated using the first analysis result of the very high frequency signal analyzer and the second analysis result of the gas component analyzer. The method according to claim 1,
Wherein the ultra-high frequency signal analyzer comprises:
A sampling unit for sampling the very high frequency signal;
A modulator for enveloping the sampled very high frequency signal;
And a ripple analyzer for detecting ripple number and ripple duration of an enveloped very high frequency signal and outputting the first analysis result. 3. The method of claim 2,
Wherein the ripple analyzer outputs a first analysis result that determines that a partial discharge has occurred in the power facility when the number of ripples and the ripple duration are out of a predetermined range. 3. The method of claim 2,
Wherein the sampling unit samples the very high frequency signal at a sampling rate of 100 Msampling / second or more. 3. The method of claim 2,
Wherein the sampling unit changes the sampling rate to a higher value when it is determined that the second analysis result and the first analysis result do not match. The apparatus as claimed in claim 1, wherein the gas component analyzer
A component classifier for selecting at least one gas component from the group consisting of C 2 H 2 and H 2 , CH 4 , C 2 H 4 and C 2 H 6 in the gas component signal; And
And a pattern analyzer for comparing the signal pattern of the gas component selected by the component classifying unit with a previously stored signal pattern and outputting the second analysis result according to matching. The method according to claim 6,
Wherein the pattern analyzing unit includes a power equipment part for outputting a second analysis result for determining that a partial discharge has occurred in the power equipment when a signal pattern of gas components more than half of the gas components selected by the component classifying unit matches a previously stored signal pattern, Discharge detection device. The method according to claim 6,
A pattern storage section for storing a signal pattern of the gas component when the partial discharge is generated, and
And an update unit for editing or updating the signal pattern stored in the pattern storage unit according to the determination result of the partial discharge detection unit. 9. The method of claim 8,
The updating unit may update the pre-stored signal pattern used for the second analysis result when the first analysis result indicates that the partial discharge has not occurred, when the second analysis result indicates that the partial discharge has occurred And counting a predetermined number of times to discard the electric power.
KR1020150113240A 2015-08-11 2015-08-11 Apparatus for partial dishcarge detection to power equipment KR101762356B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113030666A (en) * 2021-03-22 2021-06-25 三门核电有限公司 Large-scale transformer discharge fault diagnosis method and device
KR20210077944A (en) 2019-12-18 2021-06-28 한전케이디엔주식회사 Method for augmentation partial discharge data using generative adversarial network

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210077944A (en) 2019-12-18 2021-06-28 한전케이디엔주식회사 Method for augmentation partial discharge data using generative adversarial network
CN113030666A (en) * 2021-03-22 2021-06-25 三门核电有限公司 Large-scale transformer discharge fault diagnosis method and device
CN113030666B (en) * 2021-03-22 2024-06-11 三门核电有限公司 Method and device for diagnosing discharge faults of large transformer

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