CN103278724B - For monitoring the ratio flow module of defect of secondary loop of current transformer in electric system - Google Patents
For monitoring the ratio flow module of defect of secondary loop of current transformer in electric system Download PDFInfo
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- CN103278724B CN103278724B CN201310138868.3A CN201310138868A CN103278724B CN 103278724 B CN103278724 B CN 103278724B CN 201310138868 A CN201310138868 A CN 201310138868A CN 103278724 B CN103278724 B CN 103278724B
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- 230000007547 defect Effects 0.000 title claims abstract description 16
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 230000000052 comparative effect Effects 0.000 claims abstract description 6
- 230000007257 malfunction Effects 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The present invention relates to a kind of ratio flow module for monitoring defect of secondary loop of current transformer in electric system, comprising the first acquisition module, the second acquisition module, calculating and comparing module; First acquisition module is connected with protective current loop and gathers protective current; Second acquisition module is connected with measurement current return and gathers and measures electric current; Constant is provided with in calculating and comparing module; its input end is connected with the second acquisition module with the first acquisition module; output terminal is connected with Surveillance center with backstage, and it is by protective current and measure the difference of effective value of electric current and constant and to compare and according to comparative result to backstage and Surveillance center's outputting alarm signal.The present invention is compared with setting constant by the absolute value of protective current and measurement difference between currents; thus the abnormal conditions that can occur in the secondary circuit of Timeliness coverage current transformer; and then effectively avoid the malfunction of protective relaying device or the accident of tripping to occur, ensure the safe and stable operation of electric system.
Description
Technical field
The present invention relates to a kind of ratio flow module for monitoring defect of secondary loop of current transformer in electric system.
Background technology
In electric system day-to-day operation, secondary loop of mutual inductor does not allow to be open, and does not allow the situation appearance of multipoint earthing, shunting yet.Cause serious electric power accident because the open circuit of electric current secondary loop, shunting, multipoint earthing all may cause relay protection device generation malfunction or tripping, the open circuit of electric current secondary loop and loose contact more likely cause the on fire or electric current secondary loop of equipment to produce high voltage the major accident such as to hurt sb.'s feelings.
But, in electric system construction and operation, in maintenance, there is several factors that secondary loop of mutual inductor can be caused to occur open circuit, damaged, the situations such as loose contact, as: when current transformer does dielectric loss or withstand voltage high voltage electrical test, need short circuit and the secondary circuit of turn-off current mutual inductor, when doing the volt-ampere characteristic of current transformer, also the secondary side of protective current is needed to disconnect, when recovering the electric current secondary loop of the disconnection brought by above-mentioned situation, occasional is because the carelessness of staff causes " leak and recover ", " do not put in place during recovery loose contact ", the phenomenon of " during recovery non-tighten the screws ", in newly-built power transformation engineering, also often having Current Transformer Secondary side, protection terminal block side, the first-class position of protective device and occur that current connection terminal is not tightened or loose contact, there is the damaged situation causing shunting due to construction wrong in each section lead in electric current secondary loop, when power equipment runs, also can cause the situation of wire breakage or joint looseness due to vibration when running, rainy day wet weather also can cause electric current secondary loop defective insulation, and the situation of grounding shunt occurs.
Electric current secondary loop defect in above-mentioned situation is all difficult to be found; one is because backstage and Surveillance center can only observe the size of current of measuring circuit; some circuit then only can be observed a wherein phase and measure the size of electric current; and the electric current of protective loop can not be observed in Surveillance center; can only be checked through on proterctive equipment; and when equipment runs at ordinary times, can not come by artificial method to observe constantly and detect.Two is because the situation of most of electric current secondary loop joint looseness and wire broken skin is that maintainer cannot with the naked eye be checked through, so be easy to out in the cold, and leaves potential safety hazard.Three is because maintainer uses the method for " infrared measurement of temperature " when patrolling and examining, but the shunting of this method to the broken skin of cable in electric current secondary loop or the situation such as to make moist is difficult to detect, and the wiring condition of major part in Current Transformer Secondary side is also difficult to go to detect with " infrared measurement of temperature ".
Therefore, a kind of protective relaying device is needed to carry out the situation of the secondary circuit of monitor current mutual inductor so that the defect existing for Timeliness coverage.
Summary of the invention
The object of this invention is to provide a kind of can monitoring the secondary circuit of current transformer thus the protective relaying device of the defect such as open circuit, breakage, loose contact existing for Timeliness coverage.
For achieving the above object, the technical solution used in the present invention is:
A kind of ratio flow module for monitoring defect of secondary loop of current transformer in electric system; described secondary loop of mutual inductor comprises specializes in the protective current loop that protective relaying device uses and the measurement current return being used as measurement; described is arranged in described protective relaying device for the ratio flow module of monitoring defect of secondary loop of current transformer in electric system, and described comprises for the ratio flow module of monitoring defect of secondary loop of current transformer in electric system
Described comprises than stream alarm module
First acquisition module, the first described acquisition module is connected with described protective current loop and gathers protective current wherein;
Second acquisition module, the second described acquisition module is connected with described measurement current return and gathers measurement electric current wherein;
Calculating and comparing module; constant is set with in described calculating and comparing module; the input end of described calculating and comparing module is connected with the second described acquisition module with the first described acquisition module; the output terminal of described comparison computing module is connected with Surveillance center with backstage, and the difference of the effective value of described protective current and described measurement electric current and described constant compare and according to comparative result to described backstage and described Surveillance center's outputting alarm signal by described calculating and comparing module.
Described comparison computing module comprises computing module and comparison module, and described computing module and the first described acquisition module are connected with the second described acquisition module and calculate the absolute value of the difference of gathered protective current and described measurement electric current; Be provided with described constant in described comparison module, and described comparison module is connected with described computing module and alarm signal described in exporting to described backstage and described Surveillance center according to the comparative result of the absolute value of described constant and described difference.
Because technique scheme is used; the present invention compared with prior art has following advantages: the present invention is by comparing the absolute value of protective current and measurement difference between currents with setting constant; thus the abnormal conditions that can occur in the secondary circuit of Timeliness coverage current transformer; and then effectively avoid the malfunction of protective relaying device or the accident of tripping to occur, ensure the safe and stable operation of electric system.
Accompanying drawing explanation
Accompanying drawing 1 is the principle schematic of the ratio flow module for monitoring defect of secondary loop of current transformer in electric system of the present invention.
In above accompanying drawing: 1, compare flow module; 11, the first acquisition module; 12, the second acquisition module; 13, calculating and comparing module; 131, computing module; 132, comparison module.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: the secondary circuit of current transformer comprises specializes in the protective current loop that protective relaying device uses and the measurement current return being used as measurement, and protective relaying device is connected with Surveillance center with backstage.
Shown in accompanying drawing 1.A kind of ratio flow module 1 for monitoring defect of secondary loop of current transformer in electric system, is arranged in protective relaying device.
The first acquisition module 11, second acquisition module 12 and calculating and comparing module 13 is comprised than flow module 1.
First acquisition module 11 is connected with protective current loop and to protective current I wherein
pgather; Second acquisition module 12 to be connected and to measurement electric current I wherein with measurement current return
mgather.Constant R is set with in calculating and comparing module 13.The input end of calculating and comparing module 13 is connected with the second acquisition module 12 with the first acquisition module 11, and output terminal is connected with Surveillance center with backstage.Calculating and comparing module 13 will obtain protective current I
pwith measurement electric current I
mthe difference of effective value, namely compare electric current I
b=| I
p-I
m| to compare with constant R and according to comparative result to backstage and Surveillance center's outputting alarm signal.Concrete, protective current I
pwith measurement electric current I
meffective value subtract each other the absolute value I of the difference of gained
bshould be less than the constant R of setting under normal circumstances, and this setting value R the fixed value according to different situations such as the size of the type of current transformer, electric pressure, installed capacities as relay protection constant value or single relay protection device inside can set.As the absolute value I of difference
pwhen being more than or equal to this constant R, calculating and comparing module 13 sends alarm signal to backstage and Surveillance center, notifies that relevant maintainer is to hidden danger of fixing a breakdown immediately to enable this alarm signal of monitor staff's Timeliness coverage.
In the present embodiment, compare computing module 13 and comprise computing module 131 and comparison module 132, computing module 131 and the first acquisition module 11 are connected with the second acquisition module 12 and calculate gathered protective current I
pwith measurement electric current I
mthe absolute value I of difference
b; Be provided with constant R in comparison module 132, and comparison module 132 is connected with computing module 131 and according to the absolute value I of constant R and difference
bcomparative result to backstage and Surveillance center's outputting alarm signal.
By increasing than flow module 1 in existing protective relaying device, the situation of most of current circuit connections exception just can be detected, to ensureing that the normal operation of current transformer has positive effect.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (2)
1. one kind for monitoring the ratio flow module of defect of secondary loop of current transformer in electric system; described secondary loop of mutual inductor comprises specializes in the protective current loop that protective relaying device uses and the measurement current return being used as measurement; described is arranged in described protective relaying device for the ratio flow module of monitoring defect of secondary loop of current transformer in electric system, it is characterized in that: described comprises for the ratio flow module of monitoring defect of secondary loop of current transformer in electric system
First acquisition module, the first described acquisition module is connected with described protective current loop and gathers protective current wherein;
Second acquisition module, the second described acquisition module is connected with described measurement current return and gathers measurement electric current wherein;
Calculating and comparing module; constant is set with in described calculating and comparing module; the input end of described calculating and comparing module is connected with the second described acquisition module with the first described acquisition module; the output terminal of described comparison computing module is connected with Surveillance center with backstage, and the difference of the effective value of described protective current and described measurement electric current and described constant compare and according to comparative result to described backstage and described Surveillance center's outputting alarm signal by described calculating and comparing module.
2. the ratio flow module for monitoring defect of secondary loop of current transformer in electric system according to claim 1, it is characterized in that: described comparison computing module comprises computing module and comparison module, described computing module and the first described acquisition module are connected with the second described acquisition module and calculate the absolute value of the difference of gathered protective current and described measurement electric current; Be provided with described constant in described comparison module, and described comparison module is connected with described computing module and alarm signal described in exporting to described backstage and described Surveillance center according to the comparative result of the absolute value of described constant and described difference.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310138868.3A CN103278724B (en) | 2013-04-22 | 2013-04-22 | For monitoring the ratio flow module of defect of secondary loop of current transformer in electric system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310138868.3A CN103278724B (en) | 2013-04-22 | 2013-04-22 | For monitoring the ratio flow module of defect of secondary loop of current transformer in electric system |
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| Publication Number | Publication Date |
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| CN103278724A CN103278724A (en) | 2013-09-04 |
| CN103278724B true CN103278724B (en) | 2015-12-16 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093058B (en) * | 2015-06-03 | 2017-11-28 | 国家电网公司 | Current Transformer Secondary side open circuit method of discrimination and corresponding discriminating gear |
| CN112485581A (en) * | 2020-10-19 | 2021-03-12 | 广东电网有限责任公司中山供电局 | Zero sequence current transformer and secondary circuit detection device and method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980418A (en) * | 2010-11-11 | 2011-02-23 | 上海思源弘瑞自动化有限公司 | System for detecting secondary wiring of relay protection system in transformer substation on line |
| CN102520309A (en) * | 2011-12-07 | 2012-06-27 | 宁波三星电气股份有限公司 | Method for judging open circuit of secondary loop of current transformer |
| CN202735448U (en) * | 2012-04-20 | 2013-02-13 | 山西省电力公司大同供电分公司 | Multipoint grounding monitoring device |
| CN203204108U (en) * | 2013-04-22 | 2013-09-18 | 国家电网公司 | Current comparison module used for monitoring defects of secondary circuit of current transformer in power system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008157838A (en) * | 2006-12-26 | 2008-07-10 | Hitachi Industrial Equipment Systems Co Ltd | Insulation monitoring device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980418A (en) * | 2010-11-11 | 2011-02-23 | 上海思源弘瑞自动化有限公司 | System for detecting secondary wiring of relay protection system in transformer substation on line |
| CN102520309A (en) * | 2011-12-07 | 2012-06-27 | 宁波三星电气股份有限公司 | Method for judging open circuit of secondary loop of current transformer |
| CN202735448U (en) * | 2012-04-20 | 2013-02-13 | 山西省电力公司大同供电分公司 | Multipoint grounding monitoring device |
| CN203204108U (en) * | 2013-04-22 | 2013-09-18 | 国家电网公司 | Current comparison module used for monitoring defects of secondary circuit of current transformer in power system |
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| CN103278724A (en) | 2013-09-04 |
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