CN104330714B - System and method for measuring dielectric response return voltage of transformer - Google Patents
System and method for measuring dielectric response return voltage of transformer Download PDFInfo
- Publication number
- CN104330714B CN104330714B CN201410663310.1A CN201410663310A CN104330714B CN 104330714 B CN104330714 B CN 104330714B CN 201410663310 A CN201410663310 A CN 201410663310A CN 104330714 B CN104330714 B CN 104330714B
- Authority
- CN
- China
- Prior art keywords
- transformer
- voltage
- return voltage
- measuring
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a system and a method for measuring dielectric response return voltage of a transformer. An anode of a high-voltage direct-current power source (10) outputs to one end of the transformer through a first relay (11), the other end of the transformer and a cathode of the high-voltage direct-current power source are grounded, the two ends of the transformer are parallelly connected with a branch of a second relay (12) and a branch of a third relay and a measuring circuit (8), and the third relay and the measuring circuit are serially connected; the measuring circuit is composed of a breakover frequency controllable switch (2), a sampling resistor (3) and a high-value resistor (4) which are serially connected sequentially, the breakover frequency controllable switch is externally connected with a switch on-off controller (1) to control breakover frequency of the breakover frequency controllable switch, two ends of the sampling resistor outputs to a signal processing module (9), and the signal processing module comprises a voltage collecting module (5), a proportion amplifying module (6) and a computer (7) which are sequentially connected. By the system and the method, the problem of bound charge leakage in the process of measuring can be avoided, valid return voltage can be acquired by measuring, and insulation aging conditions can be accurately reflected.
Description
Technical field
The present invention relates to a kind of measuring system of transformer dielectric response return voltage.The invention still further relates to adopting described system
Unite into the measuring method of line transformer dielectric response return voltage.
Background technology
Power transformer is power Transmission and the core of distribution, is the vital part of electrical network, once it is in fortune
Break down in row, large-scale power outage can be caused, bring heavy economic losses.It is therefore necessary to ensure that the peace of transformer
Full reliability service.The safe operation of transformer is heavily dependent on its state of insulation, and transformer oil paper insulation state is done
Go out accurate evaluation just the service life of transformer can be made prediction, and change aging serious transformer in time it is ensured that electricity
The normal operation of transformer in net.Return voltage method is the conventional one kind of recent domestic to harmless, effective inspection of insulating
Survey method, its principle is when to transformer plus high direct voltage, and polarization, internal dipole in the paper oil insulation between Transformer Winding
Son aligns, and bound charge in surface, and free charge in the two poles of the earth；Remove applied voltage and shorted transformer high-low pressure around
After group, process of depolarization occurs inside paper oil insulation, polarization charge is progressively changed into disordered state from aligning, on electrode from
Bound charge part release by electric charge and insulating surface；After removing the shorting stub of two interpolars, the freely electricity of not yet release completely
Lotus and still have the bound charge necessarily aligning can transformer two ends formed electrical potential difference, referred to as return voltage.The method is
Using polarization characteristic under high direct voltage for the transformer Oil-Paper Insulation, obtain return voltage curve and its relevant parameter (bag
Include centre time constant, maximum and initial slope), the return voltage curve that the transformer of different degree of agings records has not
Same parameter, studies the relation of these parameters and water content and degree of aging etc., thus can carry out to transformer insulated situation
Judge.General voltage test method (as measured with universal meter), measuring circuit internal resistance resistance is less, can make Oil-Paper Insulation
The bound charge that polarization produces is revealed quickly through measuring loop, is difficult to effectively record return voltage value it is impossible to accurately reflect insulation
Aging performance, be therefore badly in need of a kind of effective recovery voltage measurement method.
Content of the invention
First technical problem to be solved by this invention is it is simply that provide a kind of survey of transformer dielectric response return voltage
Amount system.
Second technical problem to be solved by this invention is it is simply that provide one kind to enter line transformer dielectric using said system
The measuring method of response return voltage.
Using measuring system and the method for the present invention, it can be avoided that bound charge leaks through measuring loop in measurement process
Problem, records effective return voltage, accurately reflects the aging performance of insulation.
Solve above-mentioned first technical problem, the present invention adopts the following technical scheme that：
A kind of measuring system of transformer 14 dielectric response return voltage, is characterized in that：One high-voltage DC power supply 10, positive pole
Export to described transformer one end through the first relay 11, the other end of described transformer and the negative pole of high-voltage DC power supply connect
Ground, described transformer two ends are also parallel with the second relay 12 branch road and the 3rd relay connected and measuring circuit 8
Road；Described measuring circuit 8 is turn-on frequency gate-controlled switch 2, sample resistance 3 and the high value resistor 4 being sequentially connected in series, turn-on frequency
Gate-controlled switch 2 separately has outside connected switch on-off controller 1 to control the turn-on frequency of turn-on frequency gate-controlled switch 2, sample resistance 3 two ends
Export to a signal processing module 9, signal processing module 9 includes voltage acquisition module 5, the scaling module 6 being sequentially connected
With computer 7.
Described is 1Hz by the turn-on frequency that switch on and off controller 1 controls turn-on frequency gate-controlled switch 2, dutycycle
For 1%.
When measuring circuit 8 and tested transformer 14 conducting, voltage division signal on sample resistance 3 for the return voltage is surveyed
Amount, can obtain return voltage value after signal processing module 9.
Solve above-mentioned second technical problem, the present invention adopts the following technical scheme that：
A kind of measuring method being entered line transformer dielectric response return voltage using said system, be is characterized in that including following
Step：
The first step：Using high-voltage DC power supply 10, transformer 14 high-low pressure winding is charged, if the charging interval is t1；
Second step：After charging complete, charge circuit is disconnected, transformer 14 height winding short circuit is discharged, during electric discharge
Between be t2；
3rd step：After the completion of electric discharge, discharge loop is disconnected, using measuring circuit 8, sampling site is carried out to the return voltage producing
Measurement, then utilizes all sample amplitude when reproduced value matching return voltage curves.
The present invention compared with prior art has significant advantage and good effect, is the present invention in measuring circuit 8
In the controlled turn-on frequency of switch 2 of turn-on frequency controlled by switch on and off controller 1 and closing time be suitable be worth, energy
Enough avoid the bound charge that make in transformer 14 charging process produce constantly on transformer 14 of measuring circuit 8 in measurement process
Problem through measuring circuit 8 leakage；Seal in high value resistor 4 in measuring circuit 8, can lead with tested transformer 14 in measuring circuit 8
Slow down the leakage of bound charge when logical, improve the validity of recovery voltage measurement further；Sample resistance 3 plays the work of partial pressure
With, it is to avoid damage the device of signal processing module 9 when return voltage is too high.
The present invention can effective measuring transformer dielectric response return voltage, be accurately obtained transformer dielectric response and reply
Voltage curve, the assessment for transformer insulation state provides reliable foundation.
Brief description
Fig. 1 recovery voltage measurement circuit diagram；
Fig. 2 return voltage test system schematic diagram；
Fig. 3 transformer oil paper insulated simple equivalent circuit model；
Analogous diagram in the case of Fig. 4 return voltage no charge leakage；
Fig. 5 return voltage has analogous diagram in the case of leak charge；
Fig. 6 application present invention carries out recovery voltage measurement result figure.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 2 show return voltage test system schematic diagram, and Fig. 1 is recovery voltage measurement circuit diagram.
The measuring system embodiment of the transformer 14 dielectric response return voltage of the present invention, including a high-voltage DC power supply
10, positive pole exports to described tested transformer one end, the other end of tested transformer and high voltage direct current through the first relay 11
The minus earth in source, tested transformer two ends are also parallel with the second relay 12 branch road and the 3rd relay connected and survey
Amount circuit 8 branch road；Measuring circuit 8 is turn-on frequency gate-controlled switch 2, sample resistance 3 and the high value resistor 4 being sequentially connected in series, conducting
Frequency gate-controlled switch 2 separately has outside connected switch on-off controller 1 to control the turn-on frequency of turn-on frequency gate-controlled switch 2, sample resistance 3
Two ends export to a signal processing module 9, voltage acquisition module 5 that signal processing module 9 includes being sequentially connected, scaling mould
Block 6 and computer 7.
Wherein, the turn-on frequency controlling turn-on frequency gate-controlled switch 2 by switch on and off controller 1 is 1Hz, and dutycycle is
1%.
Enter the measuring method of line transformer dielectric response return voltage using said system, it is characterized in that walking including following
Suddenly：
The first step：Using high-voltage DC power supply 10, transformer 14 high-low pressure winding is charged, if the charging interval is t1；
Second step：After charging complete, charge circuit is disconnected, transformer 14 height winding short circuit is discharged, during electric discharge
Between be t2；
3rd step：After the completion of electric discharge, discharge loop is disconnected, using measuring circuit 8, sampling site is carried out to the return voltage producing
Measurement, then utilizes all sample amplitude when reproduced value matching return voltage curves.
Specific return voltage testing process comprises the following steps：
The first step, closes the first relay switch 11, disconnects the second relay switch 11 and the 3rd relay switch 11, profit
With high-voltage DC power supply, t1 is charged to transformer；
Second step, closes the second relay switch 11, disconnects the first relay switch 11 and the 3rd relay switch 11, will
Transformer high-low-voltage winding short circuit, carries out the t2 that discharges to transformer；
3rd step, closes the 3rd relay switch 11, disconnects the first relay switch 11 and the second relay switch 11, profit
With measuring circuit 8, return voltage is measured, using all sample amplitude when reproduced value matching return voltage curves.
It is embodied as case：
Application Matlab emulation platform carries out simulation analysis to the present invention.It is paper insulated simple that Fig. 3 show transformer oil
Equivalent-circuit model, model parameter as shown in table 1, carries out measurement emulation, reply in the case of return voltage no charge leakage respectively
Measurement in the case of voltage has leak charge emulates and applies the present invention to carry out recovery voltage measurement emulation.
The paper insulated equivalent circuit model parameter of table 1 transformer oil
Fig. 4 show in the case of return voltage no charge leakage and measures analogous diagram, and charging voltage is 500V, and the charging interval is
1000s, discharge time is 500s, by the maximum that Fig. 4 can learn return voltage no charge leakage situation lower curve is
51.46V, initial slope is 4.86V/s, and centre time constant is 49s.
Fig. 5 show return voltage and has in the case of leak charge and measures analogous diagram, and charging voltage is 500V, and the charging interval is
1000s, discharge time is 500s, can learn that the maximum that return voltage has leak charge situation lower curve is by Fig. 5
22.01V, initial slope is 5.93V/s, and centre time constant is 29s.Contrast Fig. 4 and Fig. 5 and each reply electricity of analysis gained
Pressure parameter of curve (centre time constant, return voltage maximum and initial slope) is it is known that measure in the case of having leak charge
In the case of the return voltage curve obtaining and no charge leakage, measurement result has very big deviation it is impossible to enough effectively obtain actual returning
Complex voltage.
Fig. 6 show the application present invention and carries out recovery voltage measurement result figure.IGBT is selected as gate-controlled switch in emulation,
Control its frequency and closing time with triggering square wave.The application present invention carries out recovery voltage measurement, and charging voltage is 500V, charges
Time is 1000s, and discharge time is 500s.By emulation, triggering frequency is higher, and that is, sample value is more, and return voltage is bent
Line fitting effect is better；Closing time is shorter, and return voltage curve is closer to real curve.But consider Practical Project breaker in middle
Frequency is too high to be unfavorable for the suppression to charge leakage, the too short collection being unfavorable for voltage of switch-closed time, therefore switching frequency
All should not obtain too low with closing time, comprehensive two aspect factors simultaneously combine emulation testing, and switching frequency is taken as by the present invention
1Hz, dutycycle is taken as 1%.Emulation can obtain the return voltage value of each sampling point, carries out multinomial plan to all return voltage sample value
Close, from Fourier space as curve fit type, fitting function is the Fourier space of 7：
Y=a0+a1cos(xw)+b1sin(xw)+…a7cos(7xw)+b7sin(7xw)
Fitting result is as follows：
Table 2 fitting function items coefficient value
| a1 | 4.02×1011 | b1 | 2.084×1011 | a2 | -1.758×1011 | b2 | -2.491×1011 |
| a3 | 2.105×1010 | b3 | 1.535×1011 | a4 | 1.934×1010 | b4 | -5.434×1010 |
| a5 | -1.086×1010 | b5 | 1.013×1010 | a6 | 2.283×109 | b6 | -6.384×108 |
| a7 | -1.731×108 | b7 | -3.608×107 |
RMSE:0.05379
Matching root-mean-square error is only 0.05379 it is seen that the effect of matching is very good.Can learn application originally by Fig. 6
It is 51.43V that invention carries out return voltage curve maximum during recovery voltage measurement, and initial slope is 4.87V/s, and centre time is normal
Number is 49s, and contrast Fig. 4 and Fig. 6 and analysis gained each return voltage parameter of curve are it is known that the application present invention carries out return voltage
Measurement can effectively record return voltage value.
Claims (3)
1. a kind of transformer（14）The measuring system of dielectric response return voltage, it is characterized in that including：One high-voltage DC power supply
（10）, positive pole is through the first relay（11）Export to described transformer one end, the other end of described transformer and high voltage direct current
The minus earth in source, described transformer two ends are also parallel with the second relay（12）Branch road and the 3rd relay of series connection
（13）And measuring circuit（8）Branch road；Described measuring circuit（8）For the turn-on frequency gate-controlled switch being sequentially connected in series（2）, sampling electricity
Resistance（3）And high value resistor（4）, turn-on frequency gate-controlled switch（2）Separately there is outside connected switch on-off controller（1）Control turn-on frequency can
Control switch（2）Turn-on frequency, sample resistance（3）Two ends export to a signal processing module（9）, signal processing module（9）Bag
Include the voltage acquisition module being sequentially connected（5）, scaling module（6）And computer（7）.
2. transformer according to claim 1（14）The measuring system of dielectric response return voltage, is characterized in that：Described
Switch on and off controller 1 controls turn-on frequency gate-controlled switch（2）Turn-on frequency be 1Hz, dutycycle be 1%.
3. a kind of measuring method entering line transformer dielectric response return voltage using system as claimed in claim 1 or 2, its
Feature is to comprise the following steps：
The first step：Using high-voltage DC power supply（10）To transformer（14）High-low pressure winding is charged, if the charging interval is t1；
Second step：After charging complete, charge circuit is disconnected, by transformer（14）Height winding short circuit is discharged, discharge time
For t2；
3rd step：After the completion of electric discharge, discharge loop is disconnected, using measuring circuit（8）Sampling site survey is carried out to the return voltage producing
Amount, then utilizes all sample amplitude when reproduced value matching return voltage curves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663310.1A CN104330714B (en) | 2014-11-19 | 2014-11-19 | System and method for measuring dielectric response return voltage of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663310.1A CN104330714B (en) | 2014-11-19 | 2014-11-19 | System and method for measuring dielectric response return voltage of transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104330714A CN104330714A (en) | 2015-02-04 |
| CN104330714B true CN104330714B (en) | 2017-02-08 |
Family
ID=52405477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410663310.1A Active CN104330714B (en) | 2014-11-19 | 2014-11-19 | System and method for measuring dielectric response return voltage of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104330714B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872803B (en) * | 2018-03-29 | 2020-12-08 | 福建工程学院 | Method for detecting insulation state of transformer based on insulation medium return voltage |
| CN110531230A (en) * | 2019-09-11 | 2019-12-03 | 厦门理工学院 | A kind of transformer oil paper insulation system aging method for diagnosing status |
| CN110794273A (en) * | 2019-11-19 | 2020-02-14 | 哈尔滨理工大学 | Potential time domain spectrum testing system with high-voltage driving protection electrode |
| CN111596184B (en) * | 2020-06-12 | 2023-07-28 | 云南电网有限责任公司电力科学研究院 | Method and device for detecting insulation performance of insulation medium based on electric charge quantity |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063991A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Oil-immersed transformer insulation paper polymerization degree test method based on return voltage |
| CN103063989A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Transformer oil paper insulation state testing device and control method based on return voltage method |
| CN103149517A (en) * | 2013-03-20 | 2013-06-12 | 长沙唯高电气有限公司 | Insulation, aging and nondestructive detection device and method for oil-immersion equipment based on virtual instrument |
| CN103716952A (en) * | 2013-09-17 | 2014-04-09 | 宁波凯耀电器制造有限公司 | LED switch power supply and control method thereof |
| CN204330957U (en) * | 2014-11-19 | 2015-05-13 | 广东电网有限责任公司佛山供电局 | A kind of measuring system of transformer dielectric response return voltage |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63255674A (en) * | 1987-04-13 | 1988-10-21 | Central Res Inst Of Electric Power Ind | Voltage source for insulation recovery characteristic test of switch gear |
-
2014
- 2014-11-19 CN CN201410663310.1A patent/CN104330714B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063991A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Oil-immersed transformer insulation paper polymerization degree test method based on return voltage |
| CN103063989A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Transformer oil paper insulation state testing device and control method based on return voltage method |
| CN103149517A (en) * | 2013-03-20 | 2013-06-12 | 长沙唯高电气有限公司 | Insulation, aging and nondestructive detection device and method for oil-immersion equipment based on virtual instrument |
| CN103716952A (en) * | 2013-09-17 | 2014-04-09 | 宁波凯耀电器制造有限公司 | LED switch power supply and control method thereof |
| CN204330957U (en) * | 2014-11-19 | 2015-05-13 | 广东电网有限责任公司佛山供电局 | A kind of measuring system of transformer dielectric response return voltage |
Non-Patent Citations (3)
| Title |
|---|
| Experience with return voltage measurements for assessinginsulation conditions in service-aged transformers;T.K.Saha等;《IEEE Transactions on Power Delivery》;20030131;第18卷(第1期);第128-135页 * |
| Recovery voltage measurement on oil-paper insulation with simple geometry and controlled environment;Y.C.Kuang等;《Solid Dielectrics》;20040709;第2卷;第739-742页 * |
| 基于回复电压曲线的油纸绝缘状态评估;周利军;《高电压技术》;20140228;第40卷(第2期);第489-496页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104330714A (en) | 2015-02-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204330957U (en) | A kind of measuring system of transformer dielectric response return voltage | |
| CN104330714B (en) | System and method for measuring dielectric response return voltage of transformer | |
| CN106019081A (en) | Accurate detection method for voltage travelling wave of transmission line fault based on waveform inversion | |
| CN101975911B (en) | Earth fault judging method for overhead line fault indicator | |
| CN103926466A (en) | Electrical equipment loop resistor test system and contact state evaluation method | |
| CN101201380A (en) | Method for faulty orientation and subsection of power system low current grounding | |
| CN101478149A (en) | Wire selection method for power distribution network single phase earthing failure based on transient signal | |
| CN105388392A (en) | DC power distribution cable single-end online fault positioning method based on apparent impedance identification | |
| CN103278756A (en) | Method for assessing transformer oil-paper insulation aging state | |
| CN103675607B (en) | Overhead transmission line thunderbolt and counterattack recognition methods | |
| CN107622150A (en) | A kind of transformer anti-short circuit capability appraisal procedure based on winding deformation condition diagnosing | |
| CN102879704B (en) | Multiparameter data fusion detection method for high resistance ground faults of high-voltage transmission line | |
| CN103760448A (en) | Comprehensive live test method of insulation defects of metal oxide arrester for electric power | |
| CN104730419A (en) | Voltage traveling-wave sensor and installation and use method | |
| CN105223483A (en) | A kind of DC transmission engineering insulator chain defect online detection method and device | |
| CN105116201A (en) | Measuring device and method for return voltage parameter | |
| CN204903702U (en) | Send out motor insulation testing arrangement based on return voltage method | |
| CN103869206A (en) | Grounding network state detection system for high-frequency pulse inverse scattering imaging | |
| CN105866644A (en) | System for automatically collecting transformer oil paper insulation return voltage and testing method | |
| CN111948482A (en) | Grounding electrode frequency sensitivity characteristic test evaluation method considering temperature and soil type | |
| CN103558460A (en) | Medium-voltage system arc fault detection device | |
| CN102841040B (en) | Alternate current/direct current (AC/DC) superimposed system for detecting particles in gas insulated switchgear (GIS) | |
| CN108548996B (en) | Method for detecting defects of switch cabinet based on transient ground voltage and ultrahigh frequency | |
| CN206945795U (en) | A kind of transmission line of electricity voltage x current monitoring system | |
| CN106443389A (en) | Partial discharge monitoring device of switch cabinet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |