CN101354424A - Method for detecting electric network fault transient travelling wave signal - Google Patents
Method for detecting electric network fault transient travelling wave signal Download PDFInfo
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- CN101354424A CN101354424A CNA2008100318555A CN200810031855A CN101354424A CN 101354424 A CN101354424 A CN 101354424A CN A2008100318555 A CNA2008100318555 A CN A2008100318555A CN 200810031855 A CN200810031855 A CN 200810031855A CN 101354424 A CN101354424 A CN 101354424A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to a power network transient-cause forced outage travelling wave signal detection method, belonging to the field of power system. The method is that an opening-typed special travelling wave sensor is arranged on a shell grounding wire of the transformer of a transformer substation and used for detecting the power network transient signal; the power network transient-cause forced outage travelling signal is judged according to the arising time and amplitude of the transient signal and the exact time and polarity used for the arrival of the travelling wave signal are recorded. The opening-typed special travelling wave sensor of the invention can detect the forced outage travelling wave signals of all wires at high voltage side, low voltage side and middle voltage side of the transformer of the transformer substation, thus having simple realization and facilitating generalization.
Description
Technical field
The invention belongs to grid fault diagnosis technology field, particularly a kind of method for detecting electric network fault transient travelling wave signal.
Background technology
The electric network fault transient travelling wave input is the capable ripple of transmission line malfunction location and the key of protecting.Existing transient state travelling wave signal detecting method extracts travelling wave signal from the Current Transformer Secondary side mostly, by high speed acquisition, software detection failure judgement travelling wave signal, the capable ripple of record trouble time of arrival, need to measure the transient current of every outlet, the pick-up unit complexity, the cost height.For this reason, study traveling wave sensor both at home and abroad and extracted the correlation technique that the capable ripple of electrical network transient voltage carries out localization of fault.The patent of invention of application number 200510102444.7 " the transmission line travelling wave fault location devices of time division multiplex sampling " by name discloses a kind of method of utilizing high sampling rate A/D each data acquisition channel to be carried out the analog quantity sampling under the time division multiplex situation, this method bearing accuracy height, good reliability; But this device software and hardware structure complexity needs to be equipped with high-speed collection card and special capable waveform attitude characteristic analysis software, and the equipment manufacturing cost height is not easy to apply.The patent of invention of application number 00131128.x by name " protecting power transmission line and be used for the traveling wave sensor of this method " discloses a kind of method of utilizing traveling wave sensor detection failure transient state travelling wave signal to carry out power line protection and localization of fault; traveling wave sensor in this method can detect the capable ripple of voltage and current; detect effective; but this this traveling wave sensor can only detect the fault traveling wave signal of an electric pressure circuit, and installs complicated.
Summary of the invention
The problem that the present invention is directed to above-mentioned existence provides a kind of method of utilizing the special-purpose traveling wave sensor of open type to extract the transient state travelling wave signal from the transformer case ground wire; this method is sensitive, simple in structure, easy for installation, reliable to the transient state travelling wave reflection; can be for traveling-wave protection and location provide accurately transient state travelling wave time of arrival, and the special-purpose traveling wave sensor of this open type can be realized the transient signal of all outlets of transformer high, medium and low voltage is detected.
For achieving the above object, concrete grammar of the present invention is:
1) the special-purpose traveling wave sensor of construction opening formula on substation transformer earthing of casing line;
2) utilize the special-purpose traveling wave sensor detection of grid of open type transient signal;
3) judge the electric network fault transient travelling wave signal according to the rise time and the amplitude size of transient signal, and the precise time and the polarity of the arrival of record travelling wave signal.
In the above-mentioned method for detecting electric network fault transient travelling wave signal, the special-purpose traveling wave sensor of open type is made up of two semi-circular high-frequency magnetic materials of symmetry, double-deck coiling 5～30 circle coils of every part, two semi-circular high-frequency magnetic material iron cores by bolt together.
Transformer coil is in the free oscillation process that can produce electrostatic induction, electromagnetic induction and coil inside between coil under the surge voltage effect, and generally speaking, three processes take place simultaneously, but always based on one of them.When analyzing the electrostatic induction process of transformer coil, transformer can equivalence be a capacity chain: high pressure, middle pressure and low-voltage coil are made up of vertical electric capacity of unit length respectively, there are equivalent capacity between any two in high pressure, middle pressure and low-voltage coil, also have equivalent capacity between three coils and the transformer case.When surge voltage acted on a certain lateral coil of transformer, because electrostatic induction process, electromagnetic induction and the free oscillation process of coil capacitance chain, other two coils also can produce very high induced overvoltage.The amplitude of electrostatic induction voltage depends primarily on the size of electric capacity between the ground capacitance of coil and the coil.And because transformer case exists vertical electric capacity and ground capacitance equally to coil and iron core, so also can induce the high frequency transient electric current on the earthing of casing line.Therefore from the transformer case ground wire, also can extract the high frequency transient travelling wave signal.
The method for detecting electric network fault transient travelling wave signal that the present invention proposes, utilize the special-purpose traveling wave sensor of open type to extract the transient state travelling wave signal from the earthing of casing line of transformer, do not change the primary connection of electric system, the open type traveling wave sensor can be realized the detection of all outlet transient state travelling wave signals of transformer high, medium and low voltage, and to sensitive, easy for installation, simple, the wide adaptability of transient state travelling wave reflection.
The present invention is further illustrated below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is that fault traveling wave extracts schematic diagram;
Fig. 2 is the special-purpose traveling wave sensor of open type;
(a) be cell winding coiling figure;
(b) be the sensor shape assumption diagram;
Fig. 3 is the three-phase transformer realistic model;
Simulation waveform when Fig. 4 is transformer high-voltage side line road fault;
Simulation waveform when Fig. 5 is transformer medium voltage side line fault;
Simulation waveform when Fig. 6 is step down side line fault.
Embodiment
Structure of the present invention is made up of the special-purpose traveling wave sensor 1 of open type, radioshielding cable 2, row wave-wave head detecting unit 3, row ripple time keeping unit 4 etc. as shown in Figure 1.Be socketed on the earthing of casing line 5 of transformer 6 the special-purpose traveling wave sensor 1 of open type row wave-wave head accurately, be not transformed into with having time-delay amplitude between 2V～12V, the high frequency transient travelling wave signal of frequency between 100kHz～2MHz, and deliver to the input end of capable wave-wave head detecting unit 3 through radioshielding cable 2 from secondary side; 3 pairs of input signals of row wave-wave head detecting unit carry out jump signal and detect, go the identification of wave-wave head with the amplitude of rate of change, rise or fall time and the wave head of input signal, when the rate of change level of travelling wave signal greater than 0.3V, rise or fall time less than the amplitude of 10 μ S, row wave-wave head during greater than 2V, it is that 5V, duration width are the square-wave signal of 5 μ S that row wave-wave head detecting unit produces amplitude by processing of circuit, and by delivering to capable ripple time keeping unit 4 after the high speed optoelectronic isolation; Row ripple time keeping unit 4 adopts on-site programmable gate array FPGA to realize, with the input square-wave signal carry out Filtering Processing after, with the synchronous 100MHz high precision of standard GPS pps pulse per second signal constant temperature crystal oscillator signal, latch GPS data lock in time at the input signal due in, write down row ripple channel number and polarity of traveling wave simultaneously, and the temporal information that latchs, row ripple channel number and polarity of traveling wave packing are formed row ripple information store, finish the detection and the time keeping function of transient state travelling wave signal.
As shown in Figure 2, the special-purpose traveling wave sensor 1 of open type is made up of two semi-circular high-frequency magnetic materials of symmetry, the double-deck coiling 10 circle coils of every part, and two semi-circular high-frequency magnetic material iron cores are by bolt together.The special-purpose traveling wave sensor 1 of open type can suppress high-frequency signal, only transmits the high frequency jump signal between 100kHz～2MHz.
The special-purpose traveling wave sensor 1 of open type is socketed on the earthing of casing line 5 of transformer 6, is that example is analyzed with three-phase transformer shown in Figure 36 realistic models, capable ripple progress of disease result such as Fig. 4, Fig. 5 and shown in Figure 6 of transformer 6.Among Fig. 4, the transient state travelling wave signal when curve 7 is transformer high-voltage side line road fault, curve 8 are the transient state travelling wave signal of special-purpose traveling wave sensor 1 output of open type; Among Fig. 5, the transient state travelling wave signal when curve 9 is transformer medium voltage side line fault, curve 10 are the transient state travelling wave signal of special-purpose traveling wave sensor 1 output of open type; Among Fig. 6, the transient state travelling wave signal when curve 11 is step down side line fault, curve 12 are the transient state travelling wave signal of special-purpose traveling wave sensor 1 output of open type.Utilize the special-purpose traveling wave sensor of open type from the transformer case ground wire, to extract the transient state travelling wave signal without distortion as can be known by Fig. 4, Fig. 5 and Fig. 6, this signal is judged as the fault traveling wave signal through row wave-wave head detecting unit 3, starts precise time and polarity that row ripple time keeping unit 4 record travelling wave signals arrive.
This method for detecting electric network fault transient travelling wave signal has been applied to the electric network functional failure travelling wave positioning system, show through industry spot operating experience: energy is reliable, accurate, the fault traveling wave signal of Sensitive Detection substation transformer senior middle school all circuits of low-pressure side, realize simple, be convenient to promote, have broad prospect of application.
Claims (2)
1, a kind of method for detecting electric network fault transient travelling wave signal comprises the steps:
1) the special-purpose traveling wave sensor of construction opening formula on substation transformer earthing of casing line;
2) utilize the special-purpose traveling wave sensor detection of grid of open type transient signal;
3) judge the electric network fault transient travelling wave signal according to the rise time and the amplitude size of transient signal, and the precise time and the polarity of the arrival of record travelling wave signal.
2, electric network fault transient travelling wave detection method as claimed in claim 1, it is characterized in that: the special-purpose traveling wave sensor of the open type of described step 1) is made up of two semi-circular high-frequency magnetic materials of symmetry, double-deck coiling 5～30 circle coils of every part, two semi-circular high-frequency magnetic material iron cores by bolt together.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100318555A CN101354424A (en) | 2008-07-23 | 2008-07-23 | Method for detecting electric network fault transient travelling wave signal |
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| CNA2008100318555A CN101354424A (en) | 2008-07-23 | 2008-07-23 | Method for detecting electric network fault transient travelling wave signal |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245870A (en) * | 2013-05-08 | 2013-08-14 | 长沙理工大学 | Transient state traveling wave signal detection method for transformer substation |
| CN104297636A (en) * | 2014-10-23 | 2015-01-21 | 广东电网有限责任公司电力科学研究院 | Pole-mounted distribution substation traveling wave detection method |
| CN104297643A (en) * | 2014-09-23 | 2015-01-21 | 国网河南省电力公司濮阳供电公司 | Electric power circuit insulation fault early warning device |
| CN104730418A (en) * | 2015-03-24 | 2015-06-24 | 国网河南省电力公司电力科学研究院 | Travelling wave sensing device for measuring voltage travelling waves |
| CN105929303A (en) * | 2016-04-18 | 2016-09-07 | 国网山东省电力公司郓城县供电公司 | Power-supply network fault traveling wave positioning device |
| CN106841877A (en) * | 2017-03-28 | 2017-06-13 | 海南电网有限责任公司 | Transformer hidden danger on-line monitoring method based on travelling wave current |
| CN109375063A (en) * | 2018-11-26 | 2019-02-22 | 广东电网有限责任公司 | Fault traveling wave signal coupling sensor for online fault location device |
| CN111886819A (en) * | 2018-03-13 | 2020-11-03 | Abb瑞士股份有限公司 | Intelligent electronic device comprising a cellular radio module |
| CN111965409A (en) * | 2020-07-17 | 2020-11-20 | 浙江理工大学 | Voltage transient disturbance detection method based on segmented differential waveform effective value |
| CN112578221A (en) * | 2020-11-26 | 2021-03-30 | 广东电网有限责任公司电力科学研究院 | Power transmission line fault positioning method and system |
-
2008
- 2008-07-23 CN CNA2008100318555A patent/CN101354424A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245870A (en) * | 2013-05-08 | 2013-08-14 | 长沙理工大学 | Transient state traveling wave signal detection method for transformer substation |
| CN104297643A (en) * | 2014-09-23 | 2015-01-21 | 国网河南省电力公司濮阳供电公司 | Electric power circuit insulation fault early warning device |
| CN104297636A (en) * | 2014-10-23 | 2015-01-21 | 广东电网有限责任公司电力科学研究院 | Pole-mounted distribution substation traveling wave detection method |
| CN104297636B (en) * | 2014-10-23 | 2017-02-15 | 广东电网有限责任公司电力科学研究院 | Pole-mounted distribution substation traveling wave detection method |
| CN104730418A (en) * | 2015-03-24 | 2015-06-24 | 国网河南省电力公司电力科学研究院 | Travelling wave sensing device for measuring voltage travelling waves |
| CN105929303A (en) * | 2016-04-18 | 2016-09-07 | 国网山东省电力公司郓城县供电公司 | Power-supply network fault traveling wave positioning device |
| CN106841877A (en) * | 2017-03-28 | 2017-06-13 | 海南电网有限责任公司 | Transformer hidden danger on-line monitoring method based on travelling wave current |
| CN111886819A (en) * | 2018-03-13 | 2020-11-03 | Abb瑞士股份有限公司 | Intelligent electronic device comprising a cellular radio module |
| CN111886819B (en) * | 2018-03-13 | 2022-02-18 | Abb瑞士股份有限公司 | Intelligent electronic device comprising a cellular radio module and communication method |
| US11665563B2 (en) | 2018-03-13 | 2023-05-30 | Abb Schweiz Ag | Intelligent electronic device comprising a cellular radio module |
| CN109375063A (en) * | 2018-11-26 | 2019-02-22 | 广东电网有限责任公司 | Fault traveling wave signal coupling sensor for online fault location device |
| CN111965409A (en) * | 2020-07-17 | 2020-11-20 | 浙江理工大学 | Voltage transient disturbance detection method based on segmented differential waveform effective value |
| CN112578221A (en) * | 2020-11-26 | 2021-03-30 | 广东电网有限责任公司电力科学研究院 | Power transmission line fault positioning method and system |
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Open date: 20090128 |