CN203204108U - Current comparison module used for monitoring defects of secondary circuit of current transformer in power system - Google Patents
Current comparison module used for monitoring defects of secondary circuit of current transformer in power system Download PDFInfo
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- CN203204108U CN203204108U CN 201320203615 CN201320203615U CN203204108U CN 203204108 U CN203204108 U CN 203204108U CN 201320203615 CN201320203615 CN 201320203615 CN 201320203615 U CN201320203615 U CN 201320203615U CN 203204108 U CN203204108 U CN 203204108U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 230000007547 defect Effects 0.000 title abstract 2
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 230000001681 protective effect Effects 0.000 claims description 30
- 230000002950 deficient Effects 0.000 claims description 15
- 230000000052 comparative effect Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 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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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a current comparison module used for monitoring defects of a secondary circuit of a current transformer in a power system, and the module comprises a first collection module, a second collection module, and a calculation and comparison module. The first collection module is connected with a protection current loop and collects protection current. The second collection module is connected with a measurement current loop and collects measurement current. The calculation and comparison module has a constant. An input terminal of the calculation and comparison module is connected with the first collection module and the second collection module. An output terminal of the calculation and comparison module is connected with a background and a monitoring center. The difference between an effective value of the protection current and an effective value of the measurement current is compared with the constant, and warning signals are transmitted to the background and the monitoring center according to the comparison results. The absolute value of the difference between the protection current and the measurement current is compared with the constant, so that abnormal situations of a secondary circuit of a current transformer can be found in time, a relay protection device is effectively prevented from running by mistake or from refusing to run, and safe and stable operation of a power system is ensured.
Description
Technical field
The utility model 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 the 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, the situations such as loose contact, when doing dielectric loss or withstand voltage high-voltage electrical apparatus test such 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, occasional is because staff's carelessness causes " leak and recover ", " 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 often have Current Transformer Secondary side, protection terminal row side, the first-class position of protective device 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 wire 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 occurs.
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 circuit; some circuit then only can be observed wherein a size of measuring mutually electric current; 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 wire broken skin 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 difficult to detect to the shunting of the broken skin of cable in the electric current secondary loop or the 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 utility model provides a kind of protective relaying device that can monitor to the secondary circuit of current transformer defectives such as in time finding existing open circuit, breakage, loose contact.
For achieving the above object, the technical solution adopted in the utility model 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
The first acquisition module, described the first acquisition module are connected with described protective current loop and wherein protective current are gathered;
The second acquisition module, described the second acquisition module are connected with described measurement current return and wherein measurement electric current are 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 the second acquisition module with described the 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 the second acquisition module with described the first acquisition module and calculates the absolute value of the difference of the protective current that gathers 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 utility model compared with prior art has following advantages: the utility model 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 occur, guarantee the safe and stable operation of electric system.
Description of drawings
Fig. 1 is the principle schematic of the ratio flow module for monitoring electric system secondary loop of mutual inductor defective of the present utility model.
In the 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 utility model is further described.
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 the first acquisition module 11, the second acquisition module 12 and calculating and comparing module 13 than flow module 1.
The first acquisition module 11 is connected with the protective current loop and to wherein protective current I
pGather; The second acquisition module 12 with measure that current return is connected and to wherein measurement electric current I
mGather.Be set with constant R in the 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 the backstage.Calculating and comparing module 13 will obtain protective current I
pWith the measurement electric current I
mThe difference of effective value, i.e. electric current I relatively
b=| I
p-I
m| compare with constant R and according to comparative result to backstage and Surveillance center's outputting alarm signal.Concrete, protective current I
pWith the measurement electric current I
mEffective value subtract each other the absolute value I of the difference of gained
bUnder normal circumstances should be less than the constant R that sets, and this setting value R can set as relay protection constant value or single fixed value of planting relay protection device inside according to the different situations such as the size of the type of current transformer, electric pressure, installed capacity.Absolute value I when difference
pDuring more than or equal to this constant R, calculating and comparing module 13 is sent alarm signal to backstage and Surveillance center, the relevant maintainer of the notice hidden danger of fixing a breakdown immediately so that the monitor staff can in time find this alarm signal.
In the present embodiment, relatively computing module 13 comprises computing module 131 and comparison module 132, and computing module 131 is connected with the second acquisition module 12 with the 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 circuit connections, the normal operation that guarantees current transformer is had positive effect.
Above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection domain of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, and all should be encompassed within the protection domain of the present utility model.
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
The first acquisition module, described the first acquisition module are connected with described protective current loop and wherein protective current are gathered;
The second acquisition module, described the second acquisition module are connected with described measurement current return and wherein measurement electric current are 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 the second acquisition module with described the 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. the ratio flow module for monitoring electric system secondary loop of mutual inductor defective according to claim 1, it is characterized in that: described relatively computing module comprises computing module and comparison module, and described computing module is connected with described the second acquisition module with described the first acquisition module and calculates the absolute value of the difference of the protective current that gathers 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320203615 CN203204108U (en) | 2013-04-22 | 2013-04-22 | Current comparison module used for monitoring defects of secondary circuit of current transformer in power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320203615 CN203204108U (en) | 2013-04-22 | 2013-04-22 | Current comparison module used for monitoring defects of secondary circuit of current transformer in power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203204108U true CN203204108U (en) | 2013-09-18 |
Family
ID=49148204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320203615 Expired - Lifetime CN203204108U (en) | 2013-04-22 | 2013-04-22 | Current comparison module used for monitoring defects of secondary circuit of current transformer in power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203204108U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278724A (en) * | 2013-04-22 | 2013-09-04 | 国家电网公司 | Specific current module used for monitoring defect of secondary loop of current transformer in electric power system |
| CN111856379A (en) * | 2020-06-24 | 2020-10-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer operating characteristic simulation test platform and monitoring system in low-temperature environment |
-
2013
- 2013-04-22 CN CN 201320203615 patent/CN203204108U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278724A (en) * | 2013-04-22 | 2013-09-04 | 国家电网公司 | Specific current module used for monitoring defect of secondary loop of current transformer in electric power system |
| CN103278724B (en) * | 2013-04-22 | 2015-12-16 | 国家电网公司 | For monitoring the ratio flow module of defect of secondary loop of current transformer in electric system |
| CN111856379A (en) * | 2020-06-24 | 2020-10-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer operating characteristic simulation test platform and monitoring system in low-temperature environment |
| CN111856379B (en) * | 2020-06-24 | 2022-10-04 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Monitoring system of current transformer operating characteristic simulation test platform in low-temperature environment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130918 Effective date of abandoning: 20151216 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |