CN105371742A - Bushing tap pulse signal injection method-based transformer winding deformation detection device and method - Google Patents
Bushing tap pulse signal injection method-based transformer winding deformation detection device and method Download PDFInfo
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- CN105371742A CN105371742A CN201410433101.8A CN201410433101A CN105371742A CN 105371742 A CN105371742 A CN 105371742A CN 201410433101 A CN201410433101 A CN 201410433101A CN 105371742 A CN105371742 A CN 105371742A
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Abstract
The invention provides key equipment during the power transmission and transformation process of an electrical power system. According to the invention, the key equipment conducts the tasks of voltage transformation, power allocation, power transmission and the like. The reliable operation of the key equipment is directly related to the safe and stable operation of the electrical power system. In order to timely find out the potential accidents of a transformer and improve the working efficiency, a frequency response analysis (FRA) method-based power distribution transformer winding deformation online monitoring system is developed. Meanwhile, the software of the monitoring system is programmed by adopting the LabVIEW. In this way, the online monitoring function of transformer windings is realized. According to the above system, a sensor is arranged at the bushing tap of a transformer and a pulse signal of the transformer is injected via the sensor for parameter measurement. Therefore, frequency response curves that reflect the deformation states of transformer windings can be obtained. Through comparing the frequency response curves, the deformation states of transformer windings can be effectively determined.
Description
Technical field
The present invention relates to a kind of for transformer winding fault type detection device and method, belong to transformer detection technique field.
Background technology
As the key equipment of electric system power transmission and transformation process, transformer carries the tasks such as voltage transformation, power distribution and transmission, and its reliability service is directly connected to the safety of electric system, stable operation.Although the quality of transformer along with manufacturing process and quality standard raising and constantly promote, because transformer is in online running status for a long time, the generation of fault and accident is always inevitable.In all transformer faults, the transformer fault rate caused because of winding deformation is the highest, and according to statistics, the transformer fault that the transformer of 110kV and above grade causes because winding damages every year accounts for 50%-60% in all transformer damage faults.From the situation of suspended core maintenance, often cause winding appearance deformation and failure in various degree after transformer has an accident, as radial and axial distortion, insulation damages, serious even there will be the phenomenons such as the displacement of device body, winding distortion and disconnected stock.
Intelligent grid needs six main technical supports to realize its function, and they are: 1. network topology flexibly; 2. based on open system and highly integrated communication system, so that the real-time control realized each member in system and message exchange, the every part making system all can two-way communication; 3. sensing and measuring technique, to realize the system responses more rapidly and accurately to such as remote monitoring, tou power price and user side management etc.; 4. advanced power electronic equipment, superconduction and energy storage technology; 5. advanced system monitoring method, to realize the accurate eliminating of quick diagnosis and accident; 6. senior operations staff's decision support system (DSS).
Along with deepening continuously of China's intelligent grid concept, the requirement of the user in 10kV power distribution network to power supply reliability and the quality of power supply is more and more higher.But safe, reliable, the stable operation of 10kV transformer are again the key factors of realizing this goal, therefore to the Timeliness coverage of 10kV transformer fault and get rid of and just seem particularly important.Show according to statistical data, the transformer fault of about 25% is caused by winding deformation, is thus also the important component part realizing China's intelligent network distribution construction to the monitoring of 10kV deformation of transformer winding.The intellectuality of power distribution network is the core of intelligent grid, and flexible reconfigurable distribution network topological structure and automatically healing function are the bases of following intelligent grid.Under distribution Intelligent Frame, the requirement of user to power supply quality is higher, and the failure operation of 10kV transformer can cause instability, frequency departure, the harmonic wave of user's voltage, or even the generation of large area blackout, so be significantly to the monitoring of substation transformer.At present, the main method detecting deformation of transformer winding comprises short circuit impedance method, Low Voltage Impulse Method and frequency response analysis.
Short circuit impedance method refers to when frequency is certain, and the leakage reactance size of transformer determines primarily of the geometrical scale of winding, judges whether Transformer Winding deforms by the change of measuring transformer leakage reactance.Low Voltage Impulse Method is at one end of Transformer Winding input standard impulse voltage signal, record the pulse signal of this end and the corresponding output signal of the other end simultaneously, obtain pusle response characteristics or the transport function of this winding, judged the winding deformation of transformer by the change of transport function.But the deficiency of this method is that the subtle change of input waveform will cause the significant change of response signal, and test repeatability is poor.Insensitive, especially insensitive to fault between transformer head end cake to the head end fault of test Transformer Winding, and the sensitivity of this method to transformer fault is everywhere also different, is difficult to use in on-the-spot test.
Frequency response analysis is because it is highly sensitive, signal to noise ratio (S/N ratio) is good, rig-site utilization conveniently becomes detection deformation of transformer winding application method more widely.This method is a one end stable sinusoidal voltage sweep signal or pulse signal being applied to tested transformer, record the voltage magnitude on this end and another end points and phase angle simultaneously, thus obtaining one group of Frequency Response and the transport function of tested Transformer Winding, then the change of this Frequency Response before and after deformation of transformer winding reflects the information of winding deformation.Frequency response analysis is the transport function of measuring transformer winding on wider frequency band, and analyze the frequency response characteristic of winding, judge the method for winding state, because its signal to noise ratio (S/N ratio) is good, highly sensitive, test repeatability is good, onsite application is convenient, become the main method of deformation of transformer winding site test.
Summary of the invention
To the object of the invention is to overcome in existing Winding Distortion Inspection Technology of Transformer and by carrying out the online injection of signal under presence effectively, a kind of transformer mechanical fault type detection device and detection method of the pulse signal injection method based on bottom shielding of bushing capacitive transducer cannot be provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
Described device is under presence; signal generator is utilized to inject high-frequency pulse signal to system; signal through protection circuit, voltage divider, entered the low pressure winding of transformer by Transformer Bushing Tap; utilize High Frequency Current Sensor to measure response signal at neutral line place; this response signal enters industrial computer through signal condition unit, data collecting card, and the main hardware equipment that native system uses is as follows: pulse signal generator, protection circuit, capacitive transducer, high-speed data acquisition card, industrial computer.Utilize LabVIEW software to process the signal collected, obtain the frequency response curve of Transformer Winding, thus judge the winding deformation of transformer.
Described signal source is key and the core of whole frequency response analysis detection system, and its parameter and performance determine the test effect that monitoring system detects Transformer Winding slight deformation.Document is mentioned, and according to the selection of signal source during acquisition Frequency Response, frequency response analysis can be divided into frequency sweep method and impulse response analysis method.Sine within the scope of certain frequency is called frequency sweep method as the measuring method of signal source; And a pulse signal is called impulse response analysis method as the measuring method of signal source.During apply pulse response analysis method, a short pulse signal is injected one end of test Transformer Winding, record this pulse signal and response signal simultaneously, and two time-domain signals are converted to frequency-region signal through fast fourier transform, obtain the frequency response characteristic of Transformer Winding.The test speed of frequency sweep method is slow, in test process, be more easily subject to external interference; Impulses injection method converts time domain impulsive signals to frequency-region signal through fast fourier transform, and then obtain winding Frequency Response, its Measuring Time is shorter than frequency sweep method, in addition, and pulse signal generator and sweep generator structure compared is simple, cost is low.For the problems referred to above, the present invention utilizes pulse signal as the signal source of monitoring system.
Described protected location is that transformer is when normally running; the superpotential impact such as switching overvoltage and thunderbolt can be suffered; if there is no suitable safeguard measure; very large impact can be caused on the safe operation of monitoring equipment; for preventing all kinds superpotential on the impact of equipment, the present invention devises the protected location for the protection of monitoring equipment.Adopt the hybrid protection of voltage dependent resistor (VDR) and gas-discharge tube, and by long-time continuous discharge test, within reliably port voltage being limited in 110V (peak value).
Described industrial computer (IndustrialPersonalComputer-IPC) is a kind of special computing machine, it can as industrial control unit (ICU) reliability service in industrial environment, in order to ensure accuracy under on-the-spot mal-condition and repeatability, deformation of transformer winding on-line monitoring system adopts the strong industrial computer of antijamming capability, ensures that it can normal startup optimization at the scene under cryogenic conditions.
Described voltage dependent resistor (VDR) (VoltageDependentResistor) and gas-discharge tube (Gasdischargetube) are as protection element.At a certain temperature, its resistivity sharply reduces with executing alive increase voltage dependent resistor (VDR), and when voltage exceedes the value of protection setting, first voltage dependent resistor (VDR) discharges, thus achieves the protection of the interlock circuit to equipment; Gas-discharge tube forms with the band gap metal electrode of inert gas by filling; when the voltage being applied to two electrodes reaches the voltage breakdown of gas-discharge tube; gas-discharge tube just starts electric discharge; and become Low ESR by high impedance; two electrode proximate short circuits; thus by overvoltage bypass, monitoring for protection equipment.
Described system software be based on FRA deformation of transformer winding on-line monitoring system by hardware system and software systems two part form complexity entirety, wherein, system software by whole system each independently functional module effectively link up, achieve the function such as embedding and expansion of the communication of system hardware, the visual of operation interface and algorithm, so the Software for Design of system just seems particularly important.The maximum feature of this system software is the use being convenient to field staff.For reaching this target, professional knowledge first must be considered to combine with the use habit of field staff.Secondly, the operability of software be made greatly to improve, the operation interface of hommization is provided, meanwhile, ensure that result of calculation meets accuracy requirement.In the present invention, the system software of deformation of transformer winding on-line monitoring is based on virtual instrument technology, uses the LabVIEW8.6 Virtual Instrument Development instrument of America NI company and the driving of corresponding instrument to carry out designing and developing exploitation.
After described system operating software, first user login validation program is performed, the operation that master routine carries out next step just can be entered after user rs authentication, the following sample frequency to data and storing path are arranged, after completing above-mentioned flow process, trigger generator produces nanosecond pulse signal, gathers simultaneously and record driving pulse voltage signal and response current signal, and by the display of the time domain waveform of electric current and voltage on computers.If signal sampling success ratio is low or time domain waveform abnormal, the sampling rate parameter that setting data gathers can be returned, Resurvey Wave data.Then, respectively FFT conversion is carried out to pumping signal and response signal, calculate and obtain frequency response curve, and being saved to database.Finally, original for the transformer stored Frequency Response feature is compared, calculate its related coefficient in the frequency response curve of acquisition and database, differentiate whether Transformer Winding deforms, display result.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, invention is further illustrated,
Accompanying drawing 1 is the inventive method process flow diagram.
Embodiment
Referring to Fig. 1, described device utilizes signal generator to inject high-frequency pulse signal to system, and signal enters the low pressure winding of transformer through protection circuit, voltage divider, utilizes High Frequency Current Sensor to measure response signal at neutral line place.This response signal enters industrial computer through signal condition unit, data collecting card.The main hardware equipment that native system uses is as follows: pulse signal generator, protection circuit, capacitive transducer, high-speed data acquisition card, industrial computer.Utilize LabVIEW software to process the signal collected, obtain the frequency response curve of Transformer Winding, thus judge the winding deformation of transformer.
Described signal source is key and the core of whole frequency response analysis detection system, and its parameter and performance determine the test effect that monitoring system detects Transformer Winding slight deformation.Document is mentioned, and according to the selection of signal source during acquisition Frequency Response, frequency response analysis can be divided into frequency sweep method and impulse response analysis method.Sine within the scope of certain frequency is called frequency sweep method as the measuring method of signal source; And a pulse signal is called impulse response analysis method as the measuring method of signal source.During apply pulse response analysis method, a short pulse signal is injected one end of test Transformer Winding, record this pulse signal and response signal simultaneously, and two time-domain signals are converted to frequency-region signal through fast fourier transform, obtain the frequency response characteristic of Transformer Winding.The test speed of frequency sweep method is slow, in test process, be more easily subject to external interference; Impulses injection method converts time domain impulsive signals to frequency-region signal through fast fourier transform, and then obtain winding Frequency Response, its Measuring Time is shorter than frequency sweep method, in addition, and pulse signal generator and sweep generator structure compared is simple, cost is low.For the problems referred to above, the present invention utilizes pulse signal as the signal source of monitoring system.
Described protected location is that transformer is when normally running; the superpotential impact such as switching overvoltage and thunderbolt can be suffered; if there is no suitable safeguard measure; very large impact can be caused on the safe operation of monitoring equipment; for preventing all kinds superpotential on the impact of equipment, the present invention devises the protected location for the protection of monitoring equipment.Adopt the hybrid protection of voltage dependent resistor (VDR) and gas-discharge tube, and by long-time continuous discharge test, within reliably port voltage being limited in 110V (peak value).
Described industrial computer (IndustrialPersonalComputer-IPC) is a kind of special computing machine, it can as industrial control unit (ICU) reliability service in industrial environment, in order to ensure accuracy under on-the-spot mal-condition and repeatability, deformation of transformer winding on-line monitoring system adopts the strong industrial computer of antijamming capability, ensures that it can normal startup optimization at the scene under cryogenic conditions.
Described voltage dependent resistor (VDR) (VoltageDependentResistor) and gas-discharge tube (Gasdischargetube) are as protection element.At a certain temperature, its resistivity sharply reduces with executing alive increase voltage dependent resistor (VDR), and when voltage exceedes the value of protection setting, first voltage dependent resistor (VDR) discharges, thus achieves the protection of the interlock circuit to equipment; Gas-discharge tube forms with the band gap metal electrode of inert gas by filling; when the voltage being applied to two electrodes reaches the voltage breakdown of gas-discharge tube; gas-discharge tube just starts electric discharge; and become Low ESR by high impedance; two electrode proximate short circuits; thus by overvoltage bypass, monitoring for protection equipment.
Described system software be based on FRA deformation of transformer winding on-line monitoring system by hardware system and software systems two part form complexity entirety, wherein, system software by whole system each independently functional module effectively link up, achieve the function such as embedding and expansion of the communication of system hardware, the visual of operation interface and algorithm, so the Software for Design of system just seems particularly important.The maximum feature of this system software is the use being convenient to field staff.For reaching this target, professional knowledge first must be considered to combine with the use habit of field staff.Secondly, the operability of software be made greatly to improve, the operation interface of hommization is provided, meanwhile, ensure that result of calculation meets accuracy requirement.In the present invention, the system software of deformation of transformer winding on-line monitoring is based on virtual instrument technology, uses the LabVIEW8.6 Virtual Instrument Development instrument of America NI company and the driving of corresponding instrument to carry out designing and developing exploitation.
After described system operating software, first user login validation program is performed, the operation that master routine carries out next step just can be entered after user rs authentication, the following sample frequency to data and storing path are arranged, after completing above-mentioned flow process, trigger generator produces nanosecond pulse signal, gathers simultaneously and record driving pulse voltage signal and response current signal, and by the display of the time domain waveform of electric current and voltage on computers.If signal sampling success ratio is low or time domain waveform abnormal, the sampling rate parameter that setting data gathers can be returned, Resurvey Wave data.Then, respectively FFT conversion is carried out to pumping signal and response signal, calculate and obtain frequency response curve, and being saved to database.Finally, original for the transformer stored Frequency Response feature is compared, calculate its related coefficient in the frequency response curve of acquisition and database, differentiate whether Transformer Winding deforms, display result.
Claims (3)
1. a deformation of transformer winding on-Line Monitor Device is under presence, signal generator is utilized to inject high-frequency pulse signal to system, signal is through protection circuit, voltage divider, Transformer Winding is entered by Transformer Bushing Tap, utilize High Frequency Current Sensor to measure response signal at neutral line place, this response signal is through signal condition unit, data collecting card enters industrial computer, the main hardware equipment that native system uses is as follows: pulse signal generator, protection circuit, capacitive transducer, high-speed data acquisition card, industrial computer, LabVIEW software is utilized to process the signal collected, obtain the frequency response curve of Transformer Winding, thus judge the winding deformation of transformer.
2. pick-up unit according to claim 1, its feature is as follows: described protected location is that transformer is when normally running, the superpotential impact such as switching overvoltage and thunderbolt can be suffered, if there is no suitable safeguard measure, very large impact can be caused on the safe operation of monitoring equipment, for preventing all kinds superpotential on the impact of equipment, the present invention devises the protected location for the protection of monitoring equipment, adopt the hybrid protection of voltage dependent resistor (VDR) and gas-discharge tube, and by long-time continuous discharge test, within reliably port voltage being limited in 110V (peak value).
3. pick-up unit according to claim 2, its feature is as follows: described voltage dependent resistor (VDR) (VoltageDependentResistor) and gas-discharge tube (Gasdischargetube) are as protection element, voltage dependent resistor (VDR) at a certain temperature, its resistivity sharply reduces with executing alive increase, when voltage exceedes the value of protection setting, first voltage dependent resistor (VDR) discharges, thus achieves the protection of the interlock circuit to equipment; Gas-discharge tube forms with the band gap metal electrode of inert gas by filling; when the voltage being applied to two electrodes reaches the voltage breakdown of gas-discharge tube; gas-discharge tube just starts electric discharge; and become Low ESR by high impedance; two electrode proximate short circuits; thus by overvoltage bypass, monitoring for protection equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410433101.8A CN105371742A (en) | 2014-08-29 | 2014-08-29 | Bushing tap pulse signal injection method-based transformer winding deformation detection device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410433101.8A CN105371742A (en) | 2014-08-29 | 2014-08-29 | Bushing tap pulse signal injection method-based transformer winding deformation detection device and method |
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| CN105371742A true CN105371742A (en) | 2016-03-02 |
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| CN201410433101.8A Pending CN105371742A (en) | 2014-08-29 | 2014-08-29 | Bushing tap pulse signal injection method-based transformer winding deformation detection device and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019074A (en) * | 2016-07-27 | 2016-10-12 | 国家电网公司 | Pulse injection time control method for online detection of transformer winding deformation and pulse injection time control device thereof |
| CN106679558A (en) * | 2016-12-19 | 2017-05-17 | 国网内蒙古东部电力有限公司检修分公司 | Transformer winding deformation assessment method |
| CN107102245A (en) * | 2017-06-09 | 2017-08-29 | 云南电网有限责任公司电力科学研究院 | Deformation of transformer winding and condenser bushing failure detector and method |
| CN107390081A (en) * | 2017-08-07 | 2017-11-24 | 华北电力大学 | It is a kind of to be used for the device and method being monitored powered to deformation of transformer winding |
| CN109581055A (en) * | 2018-12-28 | 2019-04-05 | 广东电网有限责任公司 | A kind of transformer winding fault type detection method based on Multiresolution Decomposition method |
-
2014
- 2014-08-29 CN CN201410433101.8A patent/CN105371742A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019074A (en) * | 2016-07-27 | 2016-10-12 | 国家电网公司 | Pulse injection time control method for online detection of transformer winding deformation and pulse injection time control device thereof |
| CN106019074B (en) * | 2016-07-27 | 2019-03-08 | 国家电网公司 | The impulses injection moment control method and device of on-line checking deformation of transformer winding |
| CN106679558A (en) * | 2016-12-19 | 2017-05-17 | 国网内蒙古东部电力有限公司检修分公司 | Transformer winding deformation assessment method |
| CN106679558B (en) * | 2016-12-19 | 2019-03-12 | 国网内蒙古东部电力有限公司检修分公司 | A kind of evaluation method of deformation of transformer winding |
| CN107102245A (en) * | 2017-06-09 | 2017-08-29 | 云南电网有限责任公司电力科学研究院 | Deformation of transformer winding and condenser bushing failure detector and method |
| CN107390081A (en) * | 2017-08-07 | 2017-11-24 | 华北电力大学 | It is a kind of to be used for the device and method being monitored powered to deformation of transformer winding |
| CN109581055A (en) * | 2018-12-28 | 2019-04-05 | 广东电网有限责任公司 | A kind of transformer winding fault type detection method based on Multiresolution Decomposition method |
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