CN102095969A - Two-winding conventional transformer differential protection automatic analysis device - Google Patents
Two-winding conventional transformer differential protection automatic analysis device Download PDFInfo
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- CN102095969A CN102095969A CN2009103115082A CN200910311508A CN102095969A CN 102095969 A CN102095969 A CN 102095969A CN 2009103115082 A CN2009103115082 A CN 2009103115082A CN 200910311508 A CN200910311508 A CN 200910311508A CN 102095969 A CN102095969 A CN 102095969A
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Abstract
The invention relates to a two-winding conventional transformer differential protection automatic analysis device. The transformer differential protection circuit protects electrical devices between current transformers forming the transformer differential protection circuit as well as wires connecting the electrical devices. The differential protection circuit is main protection circuit of a transformer and is arranged according to the circulating current principle. By applying a two-winding conventional transformer single-switch differential protection circuit CT (current transformer) wiring correctness analyzing method, not only is a secondary circuit wiring simplified, but also the reliability of the analysis result is higher than that of the analysis result of the traditional analytical method, and the analysis is not influenced by subjective factor of workers and objective environment factor, thus the accuracy of the analysis result is greatly improved.
Description
Technical field
The present invention relates to a kind of conventional transformer differential protection automatic analysing apparatus that is used to check, be specifically related to two winding conventional transformer differential protection automatic analysing apparatus.
Background technology
The correctness of conventional transformer differential protection circuit wiring directly influences the normal operation of electric power system.Correctness to the wiring of differential protection circuit is in time made analysis; it is requisite important step during transformer station invests to build, overhauls; the differential protection circuit wiring correctness of electric system is at present analyzed; mainly to pass through a large amount of calculating by manually carrying out the Zhao staff; manual drawing current vector figure, and then draw the result of differential protection circuit wiring analysis according to result of calculation and vector plot.The The whole analytical process calculated amount is big, and needs the staff rule of thumb to judge, so there is the shortcoming that efficient is low, error is big.The flow process that the tradition manual method is analyzed differential protection circuit wiring correctness is as follows:
1) obtains data: the current amplitude, phase data and the correlation parameter that obtain each each phase of winding of conventional transformer differential protection circuit.Generally obtain, as use two pincers volt-ampere phase meters by power measuring instrument.For two-windingtransformer, use two pincers volt-ampere phase meters to measure each phase (A, B, C, N) current amplitude and the phase place of high-pressure side CT and low-pressure side CT successively.
2) calculate electric current: calculate the coefficient of balance of each side earlier according to rated voltage (or transformer voltage ratio) and CT no-load voltage ratio, and then current amplitude is converted according to coefficient of balance.
3) adjust phase place: current phase is adjusted according to the mode of connection.
4) draw vector plot: according to parameter manual drawing vector plots such as current amplitude, phase places.
5) analysis and judgement: judge the wiring correctness according to current value after the conversion and vector plot, if wiring error need be analyzed correcting method.Judge according to the pacing items that mains side resultant vector and load side resultant vector should equal and opposite in directions, direction is opposite whether wiring is correct.If incorrect, then rule of thumb judge by the staff, provide correction scheme, this step does not have the flow process of standard, fully by staff quality's decision, if there is not experience, judging so wastes time and energy, and is difficult to judge for complicated error situation.
The manual method of traditional differential protection circuit wiring analysis exists following shortcoming or deficiency:
1, analysis result reliability and poor accuracy.Owing to there is not unified working specification, there is certain randomness in operation; In addition, the height of staff's professional skill, objective environment factor etc., accuracy that all can impact analysis.
2, the professional ability to operating personnel requires high.Operating personnel should be familiar with the electric system knowwhy, and will possess rich practice experience, and whether can judge the wiring of differential protection circuit correct, analyze then and where make mistakes, how to revise.
3, work complexity height, inefficiency.The data computation amount is big in the analysis and judgement process, and the manually-operated inefficiency is wasted time and energy, and in complicated operations flow process and lot of data computation process, makes a mistake unavoidably.
The automatic analysing apparatus that is used to check conventional transformer differential protecting CT wiring correctness can be realized the automatic analysis of conventional transformer differential protecting CT wiring correctness and voltage, electric current, phase measurement and polar plot function such as drafting automatically.This analytical equipment structure is mainly shown by 3 road alternating voltage sample circuits and 3 road alternating current sample circuits, A/D converter, zero-crossing comparator, C8051F0 two 1 processors, LPC two 478 processors and LCD and key circuit is that shell is formed.This instrument is by the output of the differential protecting CT of sampling mains side of conventional transformer and load side and the output of PT.Whether using the present invention, can to analyze the wiring of judging the conventional transformer differential protecting CT accurately correct, the concrete wrong of place can point out to(for) the connection of mistake, and can draw vector plot automatically.
Summary of the invention
Waste time and energy when differential protection circuit wiring error situation being judged in order to solve under the at present artificial situation, to the demanding situation of staff, the invention provides the wiring analysis device in a kind of discriminatory analysis reliability height, simple, the easy to operate electric power differential protection circuit safe in utilization.
This is suitable for novel special character and is: adopt the structure of dual processor, realize that the wiring correctness of conventional transformer differential protecting CT is analyzed automatically, the position and the type that can point out faults for the wiring of mistake; Can realize voltage, electric current, frequency, power measurement fundamental measurement function; Can draw vector plot automatically.
This suitable novel composition module and function are as follows:
AC voltage sample circuit: mainly form by mutual inductor/current clamp, I/V converter, programmable amplifier, mutual inductor is used for switching signal, tested voltage or current signal are converted to current signal according to a certain percentage, and the signal electrical isolation after making measured signal and changing, this mutual inductor also can replace with resistance.The I/V converter is used for the current signal of mutual inductor output is converted into voltage signal; Programmable amplifier is made of amplifier and digital regulation resistance, is used for amplification input signal, makes it to satisfy the requirement of A/D conversion back computational accuracy.
A/D converter: the analog signal conversion of programmable amplifier output is become digital signal.Zero-crossing comparator obtains the zero crossing of every channel signal and determines phase place.C8051F0 two 1 processors: gain-adjusted and the A/D converter of being responsible for the control programmable amplifier carry out signals collecting, also are used to calculate frequency input signal, control sample frequency and calculate phase place, and transfer data to LPC two 478 processors.LPC two 478 processors: be responsible for by the liquid crystal display operation menu; realize operating function; the data that C8051F0 two 1 processors collect are carried out conventional transformer differential protecting CT wiring correctness analysis and are provided the result, carry out exchanges data and communication by the software kit on serial ports and the PC in addition.Conventional transformer differential protecting CT wiring correctness analytical work principle of the present invention: have three kinds of metering systems and realize the analysis of wiring correctness.
Each side homophase Measurement and analysis: with voltage measurement passage one measuring transformer high-pressure side A phase voltage, measure the in-phase current of high-pressure side, medium voltage side, low-pressure side three sides simultaneously with current channel one, two, three, with A, B, C three-phase measure respectively finish after operative installations measurement data is carried out analytical calculation and is obtained the result.If medium voltage side and low-pressure side have multi-way switch and protection CT, analyze again after then each CT measurement being finished according to the method for saying above.
Single-phase Measurement and analysis: with voltage measurement passage one measuring transformer high-pressure side A phase voltage, measure on high-tension side A, B, C three-phase current respectively with current channel one, use the same method and measure medium voltage side and low-pressure side three-phase current, if multichannel CT is arranged then should adopt with quadrat method and measure each road CT.Operative installations carried out analytical calculation and obtains the result measurement data after measurement was finished.
Three-phase Measurement and analysis: with voltage measurement passage one measuring transformer high-pressure side A phase voltage, measure on high-tension side A, B, C three-phase current with current channel one, two, three, use the same method and measure medium voltage side and low-pressure side three-phase current, if multichannel CT is arranged then should adopt with quadrat method and measure each road CT.Operative installations carried out analytical calculation and obtains the result measurement data after measurement was finished.
Fundamental measurement principle of work of the present invention: after measured signal converts current signal to through mutual inductor/current clamp, by the I/V converter current signal is converted to voltage signal, uses programmable amplifier to amplify (size according to input signal is adjusted signal amplification factor automatically) then; By C8051F021 controller control A/D converter the signal after amplifying is sampled, calculated again, obtain effective value, peak-to-peak value, by the C8051F021 controller sampled data is carried out phase place and the frequency that fast fourier transform obtains being sampled signal subsequently.The above numerical value of C8051F021 controller sends to the LPC2478 processor by serial ports, and the LPC2478 processor shows and preserves.
Advantage of the present invention is:
1, differential protection has high reliability, high sensitivity.
2, simplify the secondary circuit wiring, eliminated electrically connecting of each side current transformer of transformer, the safety ground of current transformer can be moved to the mutual inductor terminal box.
3, reduced the secondary load of mutual inductor.
4, analysis result is reliable, and accuracy significantly improves.A kind of two winding conventional transformer list switch differential protecting CT wiring correctness analytical approachs provided by the present invention are carried out twice correction and are judged; can provide perfect error situation and correction scheme in the final analysis result that forms; need not again the people for judging; its analysis result reliability obviously analytical approach than traditional is strong; and not influenced by aspects such as subjective quality of staff and objective environment factor, make precision of analysis significantly improve.
5, simple to operate, safe and reliable.The present invention makes electric power differential protection loop wiring analysis job simplification, only need simply measure and can analyze and provide the result automatically, and staff's technical merit is required significantly to reduce.
Embodiment
The invention provides a kind of two winding conventional transformer differential protection automatic analysing apparatus, this invention embodiment is:
AC voltage sample circuit: mainly form by mutual inductor/current clamp, I/V converter, programmable amplifier, mutual inductor is used for switching signal, tested voltage or current signal are converted to current signal according to a certain percentage, and the signal electrical isolation after making measured signal and changing, this mutual inductor also can replace with resistance.The I/V converter is used for the current signal of mutual inductor output is converted into voltage signal; Programmable amplifier is made of amplifier and digital regulation resistance, is used for amplification input signal, makes it to satisfy the requirement of A/D conversion back computational accuracy.
A/D converter: the analog signal conversion of programmable amplifier output is become digital signal.Zero-crossing comparator obtains the zero crossing of every channel signal and determines phase place.The C8051F021 processor: gain-adjusted and the A/D converter of being responsible for the control programmable amplifier carry out signals collecting, also are used to calculate frequency input signal, control sample frequency and calculate phase place, and transfer data to LPC two 478 processors.LPC two 478 processors: be responsible for by the liquid crystal display operation menu; realize operating function; carry out conventional transformer differential protecting CT wiring correctness analysis and provide the result according to the data that the C8051F021 processor collects, carry out exchanges data and communication by the software kit on serial ports and the PC in addition.Conventional transformer differential protecting CT wiring correctness analytical work principle of the present invention: have three kinds of metering systems and realize the analysis of wiring correctness.
Each side homophase Measurement and analysis: with voltage measurement passage one measuring transformer high-pressure side A phase voltage, measure the in-phase current of high-pressure side, medium voltage side, low-pressure side three sides simultaneously with current channel one, two, three, with A, B, C three-phase measure respectively finish after operative installations measurement data is carried out analytical calculation and is obtained the result.If medium voltage side and low-pressure side have multi-way switch and protection CT, analyze again after then each CT measurement being finished according to the method for saying above.
Single-phase Measurement and analysis: with voltage measurement passage one measuring transformer high-pressure side A phase voltage, measure on high-tension side A, B, C three-phase current respectively with current channel one, use the same method and measure medium voltage side and low-pressure side three-phase current, if multichannel CT is arranged then should adopt with quadrat method and measure each road CT.Operative installations carried out analytical calculation and obtains the result measurement data after measurement was finished.
Three-phase Measurement and analysis: with voltage measurement passage one measuring transformer high-pressure side A phase voltage, measure on high-tension side A, B, C three-phase current with current channel one, two, three, use the same method and measure medium voltage side and low-pressure side three-phase current, if multichannel CT is arranged then should adopt with quadrat method and measure each road CT.Operative installations carried out analytical calculation and obtains the result measurement data after measurement was finished.
The back is carried out phase place and the frequency that fast fourier transform obtains being sampled signal by C8051F0 two 1 controllers to sampled data.The above numerical value of C8051F0 two 1 controllers sends to LPC two 478 processors by serial ports, and LPC two 478 processors show and preserve.
Claims (4)
1. two winding conventional transformer differential protection automatic analysing apparatus, it is characterized in that: described automatic analysing apparatus comprises AC voltage sample circuit, A/D converter, I/V converter, programmable amplifier; Described AC voltage sample circuit is made up of mutual inductor/current clamp, I/V converter, programmable amplifier, mutual inductor is used for switching signal, tested voltage or current signal are converted to current signal according to a certain percentage, and the signal electrical isolation after making measured signal and changing, this mutual inductor also can replace with resistance; Described I/V converter is used for the current signal of mutual inductor output is converted into voltage signal; Described programmable amplifier is made of amplifier and digital regulation resistance, is used for amplification input signal, makes it to satisfy the requirement of A/D conversion back computational accuracy.
2. two winding conventional transformer differential protection automatic analysing apparatus according to claim 1, it is characterized in that: the processor of described automatic analysing apparatus is C8051F021 processor and LPC2478 processor.
3. two winding conventional transformer differential protection automatic analysing apparatus according to claim 2; it is characterized in that: each side homophase Measurement and analysis: with voltage measurement passage one measuring transformer high-pressure side A phase voltage; measure the in-phase current of high-pressure side, medium voltage side, low-pressure side three sides simultaneously with current channel one, two, three, with A, B, C three-phase measure respectively finish after operative installations measurement data is carried out analytical calculation and is obtained the result.
4. two winding conventional transformer differential protection automatic analysing apparatus according to claim 2; it is characterized in that: voltage measurement passage one measuring transformer high-pressure side A phase voltage; measure on high-tension side A, B, C three-phase current with current channel one, two, three; use the same method and measure medium voltage side and low-pressure side three-phase current; if multichannel CT is arranged then should adopt with quadrat method and measure each road CT, measure finish after operative installations measurement data is carried out analytical calculation and is obtained the result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103115082A CN102095969A (en) | 2009-12-15 | 2009-12-15 | Two-winding conventional transformer differential protection automatic analysis device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103115082A CN102095969A (en) | 2009-12-15 | 2009-12-15 | Two-winding conventional transformer differential protection automatic analysis device |
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| CN102095969A true CN102095969A (en) | 2011-06-15 |
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| CN2009103115082A Withdrawn CN102095969A (en) | 2009-12-15 | 2009-12-15 | Two-winding conventional transformer differential protection automatic analysis device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283421A (en) * | 2018-10-16 | 2019-01-29 | 中铁电气化（武汉）设计研究院有限公司 | A kind of rail traction substation low-voltage is powered detection test method and device |
| CN109444530A (en) * | 2018-12-13 | 2019-03-08 | 浙江阿海珐配电自动化有限公司 | The method of sampling and device of AC signal |
-
2009
- 2009-12-15 CN CN2009103115082A patent/CN102095969A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283421A (en) * | 2018-10-16 | 2019-01-29 | 中铁电气化（武汉）设计研究院有限公司 | A kind of rail traction substation low-voltage is powered detection test method and device |
| CN109283421B (en) * | 2018-10-16 | 2024-02-09 | 中铁电气化（武汉）设计研究院有限公司 | Low-voltage power-on detection test method and device for railway traction substation |
| CN109444530A (en) * | 2018-12-13 | 2019-03-08 | 浙江阿海珐配电自动化有限公司 | The method of sampling and device of AC signal |
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Open date: 20110615 |