CN103063989A - Transformer oil paper insulation state testing device and control method based on return voltage method - Google Patents
Transformer oil paper insulation state testing device and control method based on return voltage method Download PDFInfo
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Abstract
The invention discloses a transformer oil paper insulation state testing device and a control method based on a return voltage method, and relates to the technical field of power sector transformer maintenance. The transformer oil paper insulation state testing device comprises a testing device control unit 1, a high-voltage direct current power module 4, a switch module 5, and a return voltage collecting unit 6. The testing device control unit 1 is connected with the switch module 5 and the return voltage collecting unit 6 through universal serial bus (USB) 2.0 connectors. One end of the high-voltage direct current power module 4 is connected with a low-voltage winding of a tested transformer through a relay S1 of the switch module 5, and the other end of the high-voltage direct current power module 4 is connected with a high-voltage winding of the tested transformer. One end of the return voltage collecting unit 6 is connected with a relay S3 of the switch module 5, and the other end of the return voltage collecting unit 6 is connected with the high-voltage winding of the tested transformer. The testing device control unit 1 achieves that a high-voltage direct current voltage is applied between any two sides of a high-voltage side, a middle-voltage side and a low-voltage side of the transformer by controlling the on-off of the relay S1, S2 and S3 of the switch module. Return voltage signal acquisition is achieved. The technical problems that an original transformer oil paper insulation state needs to be diagnosed by suspended core taking paper pattern, operation is complex, and error is great are solved.
Description
Technical field
The present invention relates to power industry transformer maintenance technology field, especially based on transformer oil paper insulation state testing device and the control method of return voltage method.
Background technology
Large oil immersed power transformer is the core of electric system, long-term in service, particularly is under the mal-condition, and the electrical endurance of transformer and mechanical life can sharply descend.If fail in time to find the insulation fault of transformer, not only can affect the safe operation of whole transformer station, also can cause large area blackout simultaneously, bring serious economic loss, or even threaten personal safety.
The diagnostic method of traditional transformer paper oil insulation state mainly contains furfural content analytic approach and insulating paper degree of polymerization analytic approach in dissolved gas analysis (DGA, Dissolved Gas-in-oil Analysis), the oil.These methods can reflect the paper insulated ageing state of transformer oil to a certain extent, but generally will get pattern by suspended core, complicated operation not only, and error is large, and has destructiveness, should not use at the scene.
The return voltage method (is called for short RVM, Return Voltage Measurement) be to utilize dielectric under the DC electric field effect, polarization phenomena can occur, thereby section produces electric field within it, and after depolarization after a while, the variation of this electric field just is called return voltage again.Analyze the paper oil insulation situation of transformer by the situation of change that detects this voltage.The return voltage method be in recent years emerging a kind of harmless, antijamming capability strong, can reflect the detection method of transformer oil paper insulation status information.According to achievement in research both domestic and external, in general, the state of insulation of transformer can characterize with three characteristic parameters, is respectively return voltage maximal value (Urmax), return voltage initial slope (Si) and centre time constant (tcdom).RVM is a kind of non-destructive testing (NDT), its test philosophy is simple, easy-to-connect, it not only can be assessed operation transformer insulation state for a long time, can also the transformer before and after the maintenance be detected, for the state estimation of transformer with safeguard the detection means that provides new, have a extensive future.
Summary of the invention
The purpose of this invention is to provide a kind of transformer oil paper insulation state testing device based on the return voltage method, the technological deficiency that exists in the hope of overcoming traditional destructive test test transformer oil paper insulation state.Another purpose of the present invention provides a kind of control method of the transformer oil paper insulation state testing device based on the return voltage method.
The object of the present invention is achieved like this: a kind of transformer oil paper insulation state testing device based on the return voltage method comprises proving installation control module 1, high voltage direct current source module 4, switch module 5, return voltage collecting unit 6; Described proving installation control module 1 is connected with switch module 5, return voltage collecting unit 6 respectively by the USB2.0 interface; Described switch module 5 is made of USB/ serial port adapter and relay, and described high voltage direct current source module 4 is made of control circuit and change-over circuit; High voltage direct current source module 4 one ends are connected with tested transformer low voltage winding 16 by the relay S1 of switch module 5, and the other end is connected with tested transformer high-voltage winding 15; Described return voltage collecting unit 6 one ends are connected with the relay S3 of switch module 5; The other end is connected with tested transformer high-voltage winding 15; Proving installation control module 1 realizes that by relay S1, the S2 of gauge tap module, the break-make of S3 high-voltage dc voltage puts on the high-pressure side of transformer, medium voltage side and low-pressure side arbitrarily between the two, realizes the collection of return voltage signal.
Described transformer oil paper insulation state testing device, described return voltage collecting unit 6 are by filtering circuit 8, A/D change-over circuit 9, and voltage signal processing unit 10, light/power conversion circuit 11 and usb circuit 12 consist of.
Further, described transformer oil paper insulation state testing device, described proving installation control module 1 also comprise expert evaluation system 2, the return voltage test macro database 3 based on the return voltage method.
Further, described transformer oil paper insulation state testing device, described proving installation control module 1 is connected with voltage signal processing unit 10 by light/power conversion circuit 11, to obtain uploading data or to assign instruction.
Further, described transformer oil paper insulation state testing device, the voltage output range of described high voltage direct current source module 4 is 0 ~ 2000VDC, and the electric current output area is 0 ~ 5A, and the acquisition rate of return voltage collecting unit is 10/second.
Further, the control method of described transformer oil paper insulation state testing device based on the return voltage method is characterized in that described method step is as follows:
(1) begins to power on; (2) program initialization; (3) whether inquiry communication is normal, if answer noly, returned for (2) step, is to continue to enter next step if answer; (4) test parameter is set; (5) start test procedure; Whether (6) ask data acquisition and finish, if answer noly, returned for (6) step, be to continue to enter next step if answer; (7) assessment result, demonstration, storage; (8) whether inquiry prints, if answer noly, enters for (10) step, is to enter next step if answer; (9) print result, finish (10).
Gao Zongbao (2011) research paper points out that the return voltage method is a kind of effective ways of assessing insulation system oil quality, can assess by the polarized spectrum figure that relatively records the insulation status of transformer oil.Utilize return voltage on-the-spot test method, return voltage on-the-spot test result to typical transformer analyzes, think aging larger on the impact of return voltage test result than moisture, the centre time constant can be used for diagnosing transformer oil paper insulation state to aging responsive especially.The present invention has then carried out the research and development of device based on the above-mentioned theory basis.
The present invention has significant advantage and good effect compared with the prior art:
(1) provides basic a kind of in transformer oil paper insulation state testing device and the control method of return voltage method, the diagnosis that has solved traditional transformer paper oil insulation state need to be got pattern by suspended core, complicated operation, error is large, and has destructive technical matters.
(2) the present invention is that the non-destructive that can't harm detects, it not only can be assessed moving permanent transformer insulation state, can also the transformer before and after the maintenance be detected, assessing for the nondestructive state of transformer provides new detection means, has a extensive future.
(3) test philosophy of the present invention is simple, and easy-to-connect has higher accuracy, in addition, also has non-destructive, the advantage such as easy and simple to handle, and promote the use of at the scene of being beneficial to.
Description of drawings
Fig. 1 is apparatus structure synoptic diagram of the present invention.
Fig. 2 is the structural representation of return voltage collecting unit among the present invention.
Fig. 3 is the wiring schematic diagram of return voltage between testing high voltage winding of the present invention and the low pressure winding.
Fig. 4 is the control flow block diagram representation that the present invention carries out the test of transformer oil paper insulation state estimation.
Embodiment
Below in conjunction with accompanying drawing and specific implementation process the present invention is further specified.It is emphasized that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention the scope of design and claim thereof.
Referring to Fig. 1, Fig. 2, shown in Figure 3.A kind of transformer oil paper insulation state testing device based on the return voltage method comprises proving installation control module 1, high voltage direct current source module 4, switch module 5, return voltage collecting unit 6; Described proving installation control module 1 is connected with switch module 5, return voltage collecting unit 6 respectively by the USB2.0 interface; Described proving installation control module 1 is selected the ThinkPad E430C of association.Be pre-stored with the expert evaluation system 2 based on the return voltage method, the return voltage test macro database 3 set up in its storage hard disk.
Described switch module 5 is comprised of USB/ serial port adapter and relay module.Wherein, the USB/ serial port adapter mainly is comprised of USB2.0 master controller FT245AM and peripheral circuit thereof, FTM245AM is the USB individual chips of a parallel FIFO bidirectional data transfers interface, the built-in device driver that is connected with PC, only need carry out necessary hardware design and simple software programming; The model that relay module adopts Misensor company to produce is the high-voltage relay of HVR1A05, has the reliable connecting-disconnecting function of 4kV DC voltage.
The voltage output range of described high voltage direct current source module 4 is 0 ~ 2000VDC, and the electric current output area is 0 ~ 5A.High voltage direct current source module 4 adopts the resonant mode high-voltage DC power supply; this power supply is based on modern power electronics technology; mainly formed by control circuit and change-over circuit; the ratio with the turn-off time opened by the control electronic switching device; reach a kind of power supply of voltage stabilization output; maximum output voltage 2kV, maximum output current 5A has the advantages such as overcurrent, overvoltage protection, volume are little, output voltage stabilization.High-voltage DC power supply one end is connected with tested transformer low voltage winding 16 by the relay S1 of switch module 5, adopts red high pressure copper conductor 13.The other end is connected with tested transformer high-voltage winding 15 by black high pressure copper conductor 14.
Return voltage collecting unit 6 is by filtering circuit 8, A/D change-over circuit 9, and voltage signal processing unit 10, usb circuit 12 and light/power conversion circuit (11) form.Wherein, filtering circuit 8 adopts the 50Hz power frequency to disturb special-purpose filtration module F42N50, the 10 bit parallel interface chip TLV1572 that A/D change-over circuit 9 adopts TI company to produce, its sampling rate is the highest can to reach 1.25MS/s, if adopt the 5V power supply, resolution can reach 1.2mV, the FPGA that voltage signal processing unit 10 is finished by the less hardware of time-delay, and its processing speed can reach tens megahertzes.The higher EP2C5T144 chip of a cost performance that FPGA adopts altera corp to produce, the indoor design of FPGA comprises interface and the USB interface with the TLV1572 chip, can also finish the automatic quick adjustment function of voltage gear.USB2.0 interface circuit 12 adopts the EZ-USB FX2TM(CY7C68013A of Cypress Semiconductor company) the USB2.0 chip.Although its inner integrated MCU is 8051 microcontrollers cheaply, because the architecture of FX2 uniqueness, data transfer speed is not affected, and still can reach the maximum bandwidth that USB2.0 allows-per second 56Mbytes.Light/power conversion circuit 11 is comprised of photodiode and optical fiber, and its transmission speed is fast, and antijamming capability is strong, selects design extremely important here.Described proving installation control module 1 is connected with voltage signal processing unit 10 by light/power conversion circuit 11, to obtain uploading data or to assign instruction.
Described return voltage collecting unit 6 one ends are connected with the relay S3 of switch module 5; The other end is connected with tested transformer high-voltage winding 15; Proving installation control module 1 realizes that by relay S1, the S2 of gauge tap module, the break-make of S3 high-voltage dc voltage puts on the high-pressure side of transformer, medium voltage side and low-pressure side arbitrarily between the two, realizes the collection of return voltage signal.This design is particularly important.Especially under the expert evaluation system 2 based on the return voltage method, return voltage test macro database 3 that described proving installation control module 1 comprises are supported, the present invention realizes the voltage of high voltage direct current source module 4 outputs is put between the high-pressure side and low-pressure side of transformer by the break-make of switch in the proving installation control module 1 gauge tap module 5, return voltage collecting unit 6 is finished the collection of voltage, upload the data to simultaneously proving installation control module 1, use expert evaluation system to pass judgment on transformer oil paper insulation state.If transformer has high-pressure side, medium voltage side and low-pressure side, so, according to identical step, finish between high voltage side of transformer and the medium voltage side, the test of return voltage between medium voltage side and the low-pressure side.
Referring to shown in Figure 4.Start-up system software, beginning, program initialization checks whether communication is normal, as communicates to connect failure, then continues program initialization, until communication is normal.Test parameter is set, parameter comprises test voltage, duration of charging discharges and recharges time ratio and transformer capacity, then starts test, system at first charges to the paper oil insulation system according to the duration of charging that arranges, be polarization process, charging process is complete, system just according to the discharge time that arranges to the paper oil insulation system discharge, it is process of depolarization, after discharge process was complete, system started the A/D change-over circuit, gathered return voltage and uploaded in real time simultaneously, per second can gather uploads 10 data, gather complete after, use expert evaluation system, finish transformer oil paper insulation state estimation result's demonstration and storage, at last, printing test result.
The below provides the test control procedure of return voltage method, and step is as follows:
(1) charging stage (polarization stage)---the relay S of switch module
1Connect S
2And S
3Disconnect, make transformer charging t to be measured
cTime.
(2) discharge regime (rapid depolarization stage)---the relay S of switch module
2Connect S
1And S
3Disconnect, remove the dc high voltage that adds, short circuit high-pressure side and low-pressure side make insulation system discharge t simultaneously
dTime, generally get t
c=2t
d
(3) measuring phases (at a slow speed depolarization phase)---at discharge t
dAfter time, S
1And S
2Disconnect S
3Closure, the voltage at collection high voltage side of transformer and low-pressure side two ends until return voltage is decayed a period of time after reaching maximum value again, obtains the return voltage curve thus.
(4) relax stage---the relay of S switch module
2Connect S
1And S
3Disconnect, short circuit high-pressure side and low-pressure side, then whole polarization phenomena of elimination insulation system begin next measuring period.
Embodiment one
Certain transformer factory, adopting the present invention is the transformer of 150MVA to a capacity that put into operation in 1987, (test product 2) tested respectively after (test product 1) and the transformation before transformation.Test voltage U is set
c=2000V, duration of charging T
c=500s, the time of discharging and recharging is compared T
c/ T
d=2.Test result is as shown in table 1.
Table 1 test result
Annotate: U
Rmax-return voltage maximal value, unit: V
S
i-return voltage initial slope, unit: V/s
t
Cdom-centre time constant, unit: s
Embodiment two:
Controller switching equipment improvement project is implemented in certain residential quarter, stops transport and has separated 2 transformers, and capacity is 630kVA, and the age of putting into operation is respectively 1987 and calendar year 2001, and numbering is respectively 1# and 2#.Utilize the present invention that these 2 transformers are tested respectively.Duration of charging U is set
c=1000V, duration of charging T
c=200s, the time of discharging and recharging is compared T
c/ T
d=2.Test result is as shown in table 2.
Table 2 test result
| The transformer numbering | U rmax?(V) | S i?(V/s) | t cdom?(s) | State of |
| 1# | 34.6 | 37.8 | 12.4 | Insulation ag(e)ing is serious |
| 2# | 9.3 | 12.5 | 38.1 | Insulating property are good |
Can find out the U of test product 1 from the test result of table 1
RmaxAnd S
iGreater than test product 2, t
CdomLess than test product 2.
Test findings shows: the insulation effect of test product 1 is very poor, and the insulation effect of test product 2 is good.Get the paper sample, utilize little water gaging instrument that 2 test products are tested, find that the micro-water content in the test product 1 has reached 23 mg/L, exceeded the 15mg/L that stipulates among standard GB/T/T 7595-2008, the micro-water content in the test product 2 only is 4.6mg/L.
Can find out the U of 1# transformer from the test result of table 2
RmaxAnd S
iLarger than 2# transformer, t
CdomLess than 2# transformer.
Test findings shows: the insulation degradation of test product 1 is serious, and the insulating property of test product 2 are good.The absorptance that adopts high-voltage digital formula megohmmeter to test 2 transformers, the absorptance of 1# transformer is that the absorptance of 1.1,2# transformer is 1.8.The power industry standard DL/T 596-1996 of People's Republic of China (PRC) regulation, absorptance can be judged insulation degradation less than 1.3 o'clock, otherwise insulating property are good.Above-mentioned two embodiment can find out that the present invention can effectively judge the paper oil insulation state of transformer.
Claims (6)
1. the transformer oil paper insulation state testing device based on the return voltage method is characterized in that, comprises proving installation control module (1), high voltage direct current source module (4), switch module (5), return voltage collecting unit (6); Described proving installation control module (1) is connected with switch module (5), return voltage collecting unit (6) respectively by the USB2.0 interface; Described switch module (5) is made of USB/ serial port adapter and relay, and described high voltage direct current source module (4) is made of control circuit and change-over circuit; High voltage direct current source module (4) one ends are connected with tested transformer low voltage winding (16) by the relay S1 of switch module (5), and the other end is connected with tested transformer high-voltage winding (15); Described return voltage collecting unit (6) one ends are connected with the relay S3 of switch module (5); The other end is connected with tested transformer high-voltage winding (15); Proving installation control module (1) realizes that by relay S1, the S2 of gauge tap module (5), the break-make of S3 high-voltage dc voltage puts on the high-pressure side of transformer, medium voltage side and low-pressure side arbitrarily between the two, realizes the collection of return voltage signal.
2. transformer oil paper insulation state testing device according to claim 1, it is characterized in that being, described return voltage collecting unit (6) is by filtering circuit (8), A/D change-over circuit (9), and voltage signal processing unit (10), light/power conversion circuit (11) and usb circuit (12) consist of.
3. transformer oil paper insulation state testing device according to claim 1 is characterized in that being, described proving installation control module (1) also comprises expert evaluation system (2), the return voltage test macro database (3) based on the return voltage method.
4. transformer oil paper insulation state testing device according to claim 2, it is characterized in that being, described proving installation control module (1) is connected with voltage signal processing unit (10) by light/power conversion circuit (11), to obtain uploading data or to assign instruction.
5. transformer oil paper insulation state testing device according to claim 1, it is characterized in that, the voltage output range of described high voltage direct current source module (4) is 0 ~ 2000VDC, and the electric current output area is 0 ~ 5A, and the acquisition rate of return voltage collecting unit is 10/second.
6. the control method of the transformer oil paper insulation state testing device based on the return voltage method according to claim 1 is characterized in that described method step is as follows:
(1) begins to power on; (2) program initialization; (3) whether inquiry communication is normal, if answer noly, returned for (2) step, is to continue to enter next step if answer; (4) test parameter is set; (5) start test procedure; Whether (6) ask data acquisition and finish, if answer noly, returned for (6) step, be to continue to enter next step if answer; (7) assessment result, demonstration, storage; (8) whether inquiry prints, if answer noly, enters for (10) step, is to enter next step if answer; (9) print result, finish (10).
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| CN104330714A (en) * | 2014-11-19 | 2015-02-04 | 广东电网有限责任公司佛山供电局 | System and method for measuring dielectric response return voltage of transformer |
| CN105116201A (en) * | 2015-09-29 | 2015-12-02 | 广东电网有限责任公司佛山供电局 | Measuring device and method for return voltage parameter |
| CN105866644A (en) * | 2016-05-27 | 2016-08-17 | 三峡大学 | System for automatically collecting transformer oil paper insulation return voltage and testing method |
| CN106093614A (en) * | 2016-05-27 | 2016-11-09 | 三峡大学 | A kind of method of return voltage initial slope assessment transformer insulation state |
| CN107064239A (en) * | 2017-02-24 | 2017-08-18 | 三峡大学 | A kind of method that transformer insulating paper conductance property is analyzed based on differential charge |
| CN109507551A (en) * | 2018-11-22 | 2019-03-22 | 西南交通大学 | The transformer oil paper insulation test platform of alternating current-direct current and positive and negative pressure when considering long |
| CN110849413A (en) * | 2019-05-30 | 2020-02-28 | 天津市津源供电设备有限公司 | Oil-immersed transformer monitoring system |
| CN113640703A (en) * | 2021-02-02 | 2021-11-12 | 西南交通大学 | Insulation state testing method for high-frequency high-voltage resonance point capture |
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| CN104330714A (en) * | 2014-11-19 | 2015-02-04 | 广东电网有限责任公司佛山供电局 | System and method for measuring dielectric response return voltage of transformer |
| CN104330714B (en) * | 2014-11-19 | 2017-02-08 | 广东电网有限责任公司佛山供电局 | System and method for measuring dielectric response return voltage of transformer |
| CN105116201A (en) * | 2015-09-29 | 2015-12-02 | 广东电网有限责任公司佛山供电局 | Measuring device and method for return voltage parameter |
| CN105116201B (en) * | 2015-09-29 | 2018-07-20 | 广东电网有限责任公司佛山供电局 | The measuring device and measuring method of return voltage parameter |
| CN105866644A (en) * | 2016-05-27 | 2016-08-17 | 三峡大学 | System for automatically collecting transformer oil paper insulation return voltage and testing method |
| CN106093614A (en) * | 2016-05-27 | 2016-11-09 | 三峡大学 | A kind of method of return voltage initial slope assessment transformer insulation state |
| CN106093614B (en) * | 2016-05-27 | 2018-10-23 | 三峡大学 | A kind of method of return voltage initial slope assessment transformer insulation state |
| CN107064239A (en) * | 2017-02-24 | 2017-08-18 | 三峡大学 | A kind of method that transformer insulating paper conductance property is analyzed based on differential charge |
| CN109507551A (en) * | 2018-11-22 | 2019-03-22 | 西南交通大学 | The transformer oil paper insulation test platform of alternating current-direct current and positive and negative pressure when considering long |
| CN110849413A (en) * | 2019-05-30 | 2020-02-28 | 天津市津源供电设备有限公司 | Oil-immersed transformer monitoring system |
| CN113640703A (en) * | 2021-02-02 | 2021-11-12 | 西南交通大学 | Insulation state testing method for high-frequency high-voltage resonance point capture |
| CN113640703B (en) * | 2021-02-02 | 2022-06-07 | 西南交通大学 | Insulation state testing method for high-frequency high-voltage resonance point capture |
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Application publication date: 20130424 |