CN102095977A - Automatic analysis device employing differential protection mode of general transformer - Google Patents
Automatic analysis device employing differential protection mode of general transformer Download PDFInfo
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- CN102095977A CN102095977A CN2009103115580A CN200910311558A CN102095977A CN 102095977 A CN102095977 A CN 102095977A CN 2009103115580 A CN2009103115580 A CN 2009103115580A CN 200910311558 A CN200910311558 A CN 200910311558A CN 102095977 A CN102095977 A CN 102095977A
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Abstract
The invention provides an automatic analysis device employing a differential protection mode of a general transformer. The automatic analysis device provided by the invention combines a method for analyzing the wiring of the differential protection CT (Computed Tomography) loop of the general transformer, adopts a double-processor structure and comprises an alternating voltage/current sampling circuit, an A/D (Analog/Digital) converter, a C8051F021 processor and an LPC2478 processor, wherein the alternating voltage/current sampling circuit comprises a mutual inductor/current pincers, an I/V converter and a programmable amplifier; and the programmable amplifier comprises an amplifier and a digital potentiometer. Due to the employment of the automatic analysis device provided by the invention, the differential protection has the advantages of high reliability and high sensitivity, the wiring of a secondary loop is simplified, and the operation is simple, safe and reliable.
Description
Technical field
The present invention relates to a kind of automatic analysing apparatus of circuit connection analytical approach, be specifically related to a kind of automatic analysing apparatus of using conventional transformer differential protecting CT circuit connection analytical approach.
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.
Summary of the invention
When efficiently solving traditional relay protection circuit wiring analysis manually-operated, the present invention analyzes result reliability and poor accuracy,, work complexity height high, ineffective problem to operating personnel's professional ability requirement.
Technical scheme of the present invention is as follows:
This automatic analysing apparatus adopts the structure of dual processor, comprises AC voltage sample circuit, A/D converter, C8051F021 processor, LPC2478 processor; Described AC voltage sample circuit comprises mutual inductor/current clamp, I/V converter, programmable amplifier; Mutual inductor is used for switching signal, and tested voltage or current signal are converted to current signal according to a certain percentage, and makes the signal electrical isolation after measured signal and the conversion, and 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; Mutual inductor can be replaced by resistance.
Also be provided with zero-crossing comparator behind the above-mentioned A/D converter, described LPC2478 processor is connected with PC by serial ports, the disposal system of LPC2478 processor and PC system compatible.
Above-mentioned analytical approach is each side homophase Measurement and analysis, single-phase Measurement and analysis or three-phase Measurement and analysis.
Above-mentioned automatic analysing apparatus comprises that also LCD shows and key circuit.
Above-mentioned AC voltage sample circuit is respectively 3 road alternating voltage sample circuits and 3 road alternating current sample circuits.
Above-mentioned PC is equipped with computational tool and the mapping software that can draw vector plot automatically.
The present invention has the following advantages:
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 2 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 automatic analysing apparatus that is used to check conventional transformer differential protecting CT wiring correctness is 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 is mainly shown by 3 road alternating voltage sample circuits and 3 road alternating current sample circuits, A/D converter, zero-crossing comparator, C8051F021 processor, LPC2478 processor 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.Use this automatic analysing apparatus to analyze accurately and judge whether the wiring of conventional transformer differential protecting CT is correct, the concrete wrong of place can point out to(for) the connection of mistake, and can draw vector plot automatically.
Waste time and energy when relay 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 relay protection circuit safe in utilization.
This is suitable for novel special character and is: adopt the structure of dual processor, realize that conventional transformer differential protecting CT wiring correctness analyzes 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.
The present invention forms module and function is 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.
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 the LPC2478 processor.
LPC2478 processor: 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." a kind of new method that conventional transformer differential protecting CT wiring correctness is analyzed " after measurement is finished in the operative installations carried out analytical calculation and obtained the result measurement data.
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.
Claims (7)
1. automatic analysing apparatus of using conventional transformer differential protection mode, it is characterized in that: described automatic analysing apparatus adopts the structure of dual processor, comprises AC voltage sample circuit, A/D converter, C8051F021 processor, LPC2478 processor; Described AC voltage sample circuit comprises mutual inductor/current clamp, I/V converter, programmable amplifier; Mutual inductor is used for switching signal, and tested voltage or current signal are converted to current signal according to a certain percentage, and makes the signal electrical isolation after measured signal and the conversion, and 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.
2. automatic analysing apparatus according to claim 1, it is characterized in that: described programmable amplifier is made of amplifier and digital regulation resistance, also be provided with zero-crossing comparator behind the described A/D converter, described LPC2478 processor is connected with PC by serial ports, the disposal system of LPC2478 processor and PC system compatible.
3. automatic analysing apparatus according to claim 2 is characterized in that: described analytical approach is each side homophase Measurement and analysis, single-phase Measurement and analysis or three-phase Measurement and analysis.
4. automatic analysing apparatus according to claim 3 is characterized in that: described automatic analysing apparatus comprises that also LCD shows and key circuit.
5. automatic analysing apparatus according to claim 4 is characterized in that: described AC voltage sample circuit is respectively 3 road alternating voltage sample circuits and 3 road alternating current sample circuits.
6. automatic analysing apparatus according to claim 5 is characterized in that: described PC is equipped with computational tool and the mapping software that can draw vector plot automatically.
7. automatic analysing apparatus according to claim 6 is characterized in that: described mutual inductor can be replaced by resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103115580A CN102095977A (en) | 2009-12-15 | 2009-12-15 | Automatic analysis device employing differential protection mode of general transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103115580A CN102095977A (en) | 2009-12-15 | 2009-12-15 | Automatic analysis device employing differential protection mode of general transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102095977A true CN102095977A (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103115580A Withdrawn CN102095977A (en) | 2009-12-15 | 2009-12-15 | Automatic analysis device employing differential protection mode of general transformer |
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| CN (1) | CN102095977A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008232A (en) * | 2017-10-23 | 2018-05-08 | 国网山东省电力公司青岛供电公司 | Secondary current return circuit detection method and device |
-
2009
- 2009-12-15 CN CN2009103115580A patent/CN102095977A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008232A (en) * | 2017-10-23 | 2018-05-08 | 国网山东省电力公司青岛供电公司 | Secondary current return circuit detection method and device |
| CN108008232B (en) * | 2017-10-23 | 2020-11-10 | 国网山东省电力公司青岛供电公司 | Secondary current loop detection method and device |
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| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |
Open date: 20110615 |