CN103278724A - Specific current module used for monitoring defect of secondary loop of current transformer in electric power system - Google Patents
Specific current module used for monitoring defect of secondary loop of current transformer in electric power system Download PDFInfo
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- CN103278724A CN103278724A CN2013101388683A CN201310138868A CN103278724A CN 103278724 A CN103278724 A CN 103278724A CN 2013101388683 A CN2013101388683 A CN 2013101388683A CN 201310138868 A CN201310138868 A CN 201310138868A CN 103278724 A CN103278724 A CN 103278724A
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Abstract
The invention relates to a specific current module used for monitoring a defect of a secondary loop of a current transformer in an electric power system. The module comprises a first acquisition module, a second acquisition module and a calculation and comparison module, wherein the first acquisition module is connected with a protecting current loop and is used for acquiring protecting current; the second acquisition module is connected with a measuring current loop and is used for acquiring measuring current; and a constant is set in the calculation and comparison module, an input end of the calculation and comparison module is connected with the first acquisition module and the second acquisition module, an output end of the calculation and comparison module is connected with a background and a monitoring center, and the calculation and comparison module is used for comparing the difference value between the effective values of the protecting current and the measuring current with the constant and outputting an alarm signal to the background and the monitoring center according to the comparing result. Abnormity in the secondary loop of the current transformer can be timely found by comparing the absolute value of the difference value between the effective values of the protecting current and the measuring current with the set constant, so that the accidents of accidental operation and fault to operation of a relay protecting device are effectively prevented, and the electric power system is ensured to safely and stably run.
Description
Technical field
The present invention relates to a kind of ratio flow module for monitoring electric system secondary loop of mutual inductor defective.
Background technology
In the electric system day-to-day operation, secondary loop of mutual inductor does not allow to be open, and does not allow the situation of multipoint earthing, shunting to occur 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 cause that more likely on fire the or electric current secondary loop of equipment produces high voltage major accident such as hurt sb.'s feelings.
But, in electric system construction and operation, in the maintenance, there is several factors can cause secondary loop of mutual inductor open circuit to occur, damaged, situations such as loose contact, when doing dielectric loss or withstand voltage high-voltage electrical apparatus test as: current transformer, the secondary circuit that needs short circuit and turn-off current mutual inductor, when doing the volt-ampere characteristic of current transformer, also need the secondary side of protective current is disconnected, when the electric current secondary loop of the disconnection that recovers to be brought by above-mentioned situation, can cause " leak and recover " once in a while because of staff's carelessness, " loose contact does not put in place during recovery ", the phenomenon of " during recovery not tighten the screws "; In newly-built power transformation engineering, also have Current Transformer Secondary side, protection terminal row side, the first-class position of protective device often and the electric current splicing ear occurs and do not tighten or loose contact, each section lead in the electric current secondary loop is because the damaged situation about shunting of causing appears in construction wrong; In power equipment when operation,, the vibration in the time of also can be owing to operation causes lead breakage or the loosening situation of joint; The rainy day wet weather is also can cause the electric current secondary loop defective insulation, and the situation of grounding shunt takes place.
Electric current secondary loop defective in the above-mentioned situation all is difficult to be found; the one, because backstage and Surveillance center can only observe the size of current of measuring the loop; some circuit then only can be observed wherein a size of measuring electric current mutually; and the electric current in protection loop can not be observed in Surveillance center; can only be checked through at protection equipment; and in equipment when operation at ordinary times, can not observe constantly and detect with artificial method.The 2nd, because most of electric current secondary loop joint is loosening and the situation of the broken skin of lead is that the maintainer can't with the naked eye be checked through, so be easy to out in the coldly, and stay potential safety hazard.The 3rd, because the maintainer uses the method for " infrared measurement of temperature " when patrolling and examining, but this method is to be difficult to detectedly to the shunting of the broken skin of cable in the electric current secondary loop or situation such as make moist, and most of wiring situation in the Current Transformer Secondary side also is difficult to go detection with " infrared measurement of temperature ".
Therefore, need a kind of protective relaying device to come the situation of secondary circuit of monitor current mutual inductor in order in time find existing defective.
Summary of the invention
Thereby the purpose of this invention is to provide a kind of protective relaying device that can monitor defectives such as in time finding existing open circuit, breakage, loose contact to the secondary circuit of current transformer.
For achieving the above object, the technical solution used in the present invention is:
A kind of ratio flow module for monitoring electric system secondary loop of mutual inductor defective; described secondary loop of mutual inductor comprises specializes in protective relaying device the protective current loop of using and the measurement current return that is used as measurement; described ratio flow module for monitoring electric system secondary loop of mutual inductor defective is arranged in the described protective relaying device, and described ratio flow module for monitoring electric system secondary loop of mutual inductor defective comprises
Described ratio stream alarm module comprises
First acquisition module, described first acquisition module is connected with described protective current loop and protective current is wherein gathered;
Second acquisition module, described second acquisition module is connected with described measurement current return and measurement electric current is wherein gathered;
Calculating and comparing module; be set with constant in the described calculating and comparing module; the input end of described calculating and comparing module is connected with described second acquisition module with described first acquisition module; the output terminal of described relatively computing module is connected with Surveillance center with the backstage, described calculating and comparing module with the difference of the effective value of described protective current and described measurement electric current and described constant compares and according to comparative result to described backstage and described Surveillance center outputting alarm signal.
Described relatively computing module comprises computing module and comparison module, and described computing module is connected with described second acquisition module with described first acquisition module and calculates the absolute value of the difference of the protective current gathered and described measurement electric current; Be provided with described constant in the described comparison module, and described comparison module is connected with described computing module and export described alarm signal according to the comparative result of the absolute value of described constant and described difference to described backstage and described Surveillance center.
Because technique scheme is used; the present invention compared with prior art has following advantage: the present invention compares with the setting constant by the absolute value with protective current and measurement difference between currents; thereby can in time find the abnormal conditions that occur in the secondary circuit of current transformer; and then effectively avoid the malfunction of protective relaying device or the accident of tripping to take place, guarantee the safe and stable operation of electric system.
Description of drawings
Accompanying drawing 1 is the principle schematic for the ratio flow module of monitoring electric system secondary loop of mutual inductor defective of the present invention.
In the above accompanying drawing: 1, compare flow module; 11, first acquisition module; 12, second acquisition module; 13, calculating and comparing module; 131, computing module; 132, comparison module.
Embodiment
Be further described below in conjunction with the present invention of embodiment shown in the drawings.
Embodiment one: the secondary circuit of current transformer comprises specializes in protective relaying device the protective current loop of using and the measurement current return that is used as measurement, and protective relaying device is connected with Surveillance center with the backstage.
Shown in accompanying drawing 1.A kind of ratio flow module 1 for monitoring electric system secondary loop of mutual inductor defective is arranged in the protective relaying device.
Comprise first acquisition module 11, second acquisition module 12 and calculating and comparing module 13 than flow module 1.
In the present embodiment, relatively computing module 13 comprises computing module 131 and comparison module 132, and computing module 131 is connected with second acquisition module 12 with first acquisition module 11 and calculates the protective current I that gathers
pWith the measurement electric current I
mThe absolute value I of difference
bBe provided with constant R in the 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 in existing protective relaying device, increasing than flow module 1, just can detect the unusual situation of most of current return wiring, the normal operation that guarantees current transformer is had positive effect.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit essence is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (2)
1. ratio flow module that is used for monitoring electric system secondary loop of mutual inductor defective; described secondary loop of mutual inductor comprises specializes in protective relaying device the protective current loop of using and the measurement current return that is used as measurement; described ratio flow module for monitoring electric system secondary loop of mutual inductor defective is arranged in the described protective relaying device, it is characterized in that: described ratio flow module for monitoring electric system secondary loop of mutual inductor defective comprises
Described ratio stream alarm module comprises
First acquisition module, described first acquisition module is connected with described protective current loop and protective current is wherein gathered;
Second acquisition module, described second acquisition module is connected with described measurement current return and measurement electric current is wherein gathered;
Calculating and comparing module; be set with constant in the described calculating and comparing module; the input end of described calculating and comparing module is connected with described second acquisition module with described first acquisition module; the output terminal of described relatively computing module is connected with Surveillance center with the backstage, described calculating and comparing module with the difference of the effective value of described protective current and described measurement electric current and described constant compares and according to comparative result to described backstage and described Surveillance center outputting alarm signal.
2. according to claim 1 for the ratio flow module of monitoring electric system secondary loop of mutual inductor defective, it is characterized in that: described relatively computing module comprises computing module and comparison module, and described computing module is connected with described second acquisition module with described first acquisition module and calculates the absolute value of the difference of the protective current gathered and described measurement electric current; Be provided with described constant in the described comparison module, and described comparison module is connected with described computing module and export described alarm signal according to the comparative result of the absolute value of described constant and described difference to described backstage and described Surveillance center.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN103278724A true CN103278724A (en) | 2013-09-04 |
| CN103278724B CN103278724B (en) | 2015-12-16 |
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| CN201310138868.3A Active 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093058A (en) * | 2015-06-03 | 2015-11-25 | 国家电网公司 | Method for determining whether secondary circuit of current transformer is left open-circuited and corresponding determining apparatus |
| 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 |
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| JP2008157838A (en) * | 2006-12-26 | 2008-07-10 | Hitachi Industrial Equipment Systems Co Ltd | Insulation monitoring device |
| 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 |
-
2013
- 2013-04-22 CN CN201310138868.3A patent/CN103278724B/en active Active
Patent Citations (5)
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093058A (en) * | 2015-06-03 | 2015-11-25 | 国家电网公司 | Method for determining whether secondary circuit of current transformer is left open-circuited and corresponding determining apparatus |
| 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 |
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| CN103278724B (en) | 2015-12-16 |
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