CN106549371A - The method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction - Google Patents
The method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction Download PDFInfo
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- CN106549371A CN106549371A CN201610982923.0A CN201610982923A CN106549371A CN 106549371 A CN106549371 A CN 106549371A CN 201610982923 A CN201610982923 A CN 201610982923A CN 106549371 A CN106549371 A CN 106549371A
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- ufls
- ferromagnetic
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- malfunction
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
A kind of method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction is embodiments provided, methods described includes：Obtain negative sequence voltage U2With comprehensive harmonic information Uxb；Judge negative sequence voltage U2With comprehensive harmonic information UxbIt is whether abnormal, if there is PT ferromagnetic resonances, locking UFLS；Otherwise there is no PT ferromagnetic resonances, open UFLS.Above-mentioned technical proposal proposes a kind of method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction, can utilize negative sequence voltage amplitude and feature identification PT of comprehensive harmonic information that PT ferromagnetic resonances or failure occur, and then realize to UFLS locking.The embodiment of the present invention can make up the defect of traditional low-frequency off-load logic, can effectively prevent PT ferromagnetic resonances from causing UFLS malfunction.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, referring in particular to one kind prevents PT (voltage transformer) ferromagnetic
The method and apparatus that resonance causes UFLS malfunction.
Background technology
Frequently with electromagnetic potential transformer in 35kV and following electric pressure power system.Electromagnetic potential transformer
Including inductance over the ground and bus direct-to-ground capacitance, and constitute oscillation circuit.(for example switch and close suddenly when electrical network occurs shock vibration
There is moment arc grounding phenomenon etc. in lock or bus), may all make one mutually or biphase voltage-to-ground moment improves so that mutual inductance
The exciting current of device increases suddenly and saturation occurs, and its equivalent magnetizing inductance L accordingly reduces, and resonance occurs.Ferromagnetic resonance can draw
The voltage waveform distortion for rising, may cause UFLS malfunction.
The content of the invention
Low frequency can be caused when electrical network occurs shock vibration for electromagnetic potential transformer present in prior art
Off-load malfunction, embodiment of the present invention technical problem to be solved are to propose that one kind prevents PT ferromagnetic resonances from causing UFLS malfunction
Method and apparatus.
In order to solve the above problems, the embodiment of the present invention proposes one kind prevents PT ferromagnetic resonances from causing UFLS malfunction
Method, including：
Obtain negative sequence voltage U2With comprehensive harmonic information Uxb；
Judge negative sequence voltage U2With comprehensive harmonic information UxbIt is whether abnormal, if there is PT ferromagnetic resonances, locking low frequency
Off-load；Otherwise there is no PT ferromagnetic resonances, open UFLS.
Wherein, judge negative sequence voltage U2Whether exception is specifically included：
Judge U2>Κ2Whether set up, PT ferromagnetic resonances if it is occur；Wherein K2For negative sequence voltage threshold value.
Wherein, judge comprehensive harmonic information UxbWhether exception is specifically included：
Judge Uxb>ΚUjbWhether set up, PT ferromagnetic resonances if it is occur；Wherein UxbSynthesis for frequency measurement voltage is humorous
Wave voltage, UjbFor the fundamental voltage of frequency measurement voltage, K is comprehensive harmonic wave and fundamental wave ratio threshold value.
Wherein, the comprehensive harmonic wave and the value of fundamental wave ratio threshold value K are 0.15～0.2.
Meanwhile, the embodiment of the present invention also proposed a kind of device for preventing PT ferromagnetic resonances from causing UFLS malfunction, bag
Include：
Parameter acquisition module, for obtaining negative sequence voltage U2With comprehensive harmonic information Uxb；
Breakdown judge module, for judging negative sequence voltage U2With comprehensive harmonic information UxbIt is whether abnormal, if there is PT
Ferromagnetic resonance, locking UFLS；Otherwise there is no PT ferromagnetic resonances, open UFLS.
The above-mentioned technical proposal of the present invention has the beneficial effect that：Above-mentioned technical proposal proposes one kind prevents PT ferromagnetic humorous
Shake the method and apparatus for causing UFLS malfunction, can utilize feature identification PT of negative sequence voltage amplitude and comprehensive harmonic information
Generation PT ferromagnetic resonances or failure, and then realize to UFLS locking.The embodiment of the present invention can make up traditional low-frequency off-load
The defect of logic, can effectively prevent PT ferromagnetic resonances from causing UFLS malfunction.
Description of the drawings
Fig. 1 prevents the flow chart that PT ferromagnetic resonances cause the method for UFLS malfunction for the embodiment of the present invention.
Specific embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
The embodiment of the present invention proposes a kind of method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction, utilizes
The amplitude information of negative sequence voltage and the comprehensive harmonic information of three-phase voltage are differentiating ferromagnetic resonance；When there is PT ferromagnetic resonances
The reliable locking UFLS of energy, and when there is no PT ferromagnetic resonances, can quickly open UFLS.
Based in PT ferromagnetic resonances possibly subharmonic resonance or higher harmonic resonance, therefore the embodiment of the present invention simultaneously
Measurement negative sequence voltage amplitude information and three-phase voltage comprehensive harmonic information, and with this come discriminate whether occur ferromagnetic resonance；
The locking UFLS if generation PT ferromagnetic resonances, otherwise opens UFLS.Can so prevent from drawing due to the ferromagnetic harmonic waves of PT
The UFLS of the mistake for rising, prevents malfunction.Wherein, negative sequence voltage U can be adopted during subharmonic resonance2Amplitude sentencing
Not, can be using comprehensive harmonic information U during higher harmonic resonancexbTo differentiate；Negative sequence voltage U when normal2Amplitude is humorous with comprehensive
Ripple information UxbEqual very little.
Therefore, the PT ferromagnetic resonances that prevent of the embodiment of the present invention cause the method for UFLS malfunction to include：
Obtain negative sequence voltage U2With comprehensive harmonic information Uxb；
Judge negative sequence voltage U2With comprehensive harmonic information UxbIt is whether abnormal, if there is PT ferromagnetic resonances, locking low frequency
Off-load；Otherwise there is no PT ferromagnetic resonances, open UFLS.
Further, judge negative sequence voltage U2Whether exception is specifically included：
Judge U2>Κ2Whether set up, PT ferromagnetic resonances if it is occur；Wherein K2For negative sequence voltage threshold value.
Further, judge comprehensive harmonic information UxbWhether exception is specifically included：
Judge Uxb>ΚUjbWhether set up, PT ferromagnetic resonances if it is occur；Wherein UxbSynthesis for frequency measurement voltage is humorous
Wave voltage, UjbFor the fundamental voltage of frequency measurement voltage, K is comprehensive harmonic wave and fundamental wave ratio threshold value.
Wherein, comprehensive harmonic wave and the value of fundamental wave ratio threshold value K are 0.15～0.2.
Meanwhile, the embodiment of the present invention also proposed a kind of device for preventing PT ferromagnetic resonances from causing UFLS malfunction, bag
Include：
Parameter acquisition module, for obtaining negative sequence voltage U2With comprehensive harmonic information Uxb；
Breakdown judge module, for judging negative sequence voltage U2With comprehensive harmonic information UxbIt is whether abnormal, if there is PT
Ferromagnetic resonance, locking UFLS；Otherwise there is no PT ferromagnetic resonances, open UFLS.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of without departing from principle of the present invention, some improvements and modifications can also be made, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of method for preventing PT ferromagnetic resonances from causing UFLS malfunction, it is characterised in that include：
Obtain negative sequence voltage U2With comprehensive harmonic information Uxb；
Judge negative sequence voltage U2With comprehensive harmonic information UxbIt is whether abnormal, if there is PT ferromagnetic resonances, locking UFLS；
Otherwise there is no PT ferromagnetic resonances, open UFLS.
2. the method for preventing PT ferromagnetic resonances from causing UFLS malfunction according to claim 1, it is characterised in that judge
Negative sequence voltage U2Whether exception is specifically included：
Judge U2>Κ2Whether set up, PT ferromagnetic resonances if it is occur；Wherein K2For negative sequence voltage threshold value.
3. the method for preventing PT ferromagnetic resonances from causing UFLS malfunction according to claim 1, it is characterised in that judge
Comprehensive harmonic information UxbWhether exception is specifically included：
Judge Uxb>ΚUjbWhether set up, PT ferromagnetic resonances if it is occur；Wherein UxbFor the comprehensive harmonic wave electricity of frequency measurement voltage
Pressure, UjbFor the fundamental voltage of frequency measurement voltage, K is comprehensive harmonic wave and fundamental wave ratio threshold value.
4. the method for preventing PT ferromagnetic resonances from causing UFLS malfunction according to claim 3, it is characterised in that described
Comprehensive harmonic wave is 0.15～0.2 with the value of fundamental wave ratio threshold value K.
5. a kind of device for preventing PT ferromagnetic resonances from causing UFLS malfunction, it is characterised in that include：
Parameter acquisition module, for obtaining negative sequence voltage U2With comprehensive harmonic information Uxb；
Breakdown judge module, for judging negative sequence voltage U2With comprehensive harmonic information UxbIt is whether abnormal, if it is ferromagnetic that PT occurs
Resonance, locking UFLS；Otherwise there is no PT ferromagnetic resonances, open UFLS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610982923.0A CN106549371A (en) | 2016-11-09 | 2016-11-09 | The method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610982923.0A CN106549371A (en) | 2016-11-09 | 2016-11-09 | The method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction |
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| Publication Number | Publication Date |
|---|---|
| CN106549371A true CN106549371A (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610982923.0A Pending CN106549371A (en) | 2016-11-09 | 2016-11-09 | The method and apparatus for preventing PT ferromagnetic resonances from causing UFLS malfunction |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2702502Y (en) * | 2004-03-04 | 2005-05-25 | 保定浪拜迪电气股份有限公司 | A ferromagnetic resonance diagnostic eliminator of voltage transformer |
| EP1995856B1 (en) * | 1997-06-11 | 2014-02-26 | Abb Ab | A method for communication between a low potential level and a valve located on high voltage potential in a high voltage converter station as well as a device for such a communication |
| CN104375025A (en) * | 2014-10-31 | 2015-02-25 | 国家电网公司 | Diagnostic method for ferromagnetic resonance in neutral non-grounding 10kV system |
| CN105552867A (en) * | 2015-12-21 | 2016-05-04 | 中国西电电气股份有限公司 | Device and method for inhibiting ferromagnetic resonance in high-voltage grid GIS |
-
2016
- 2016-11-09 CN CN201610982923.0A patent/CN106549371A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1995856B1 (en) * | 1997-06-11 | 2014-02-26 | Abb Ab | A method for communication between a low potential level and a valve located on high voltage potential in a high voltage converter station as well as a device for such a communication |
| CN2702502Y (en) * | 2004-03-04 | 2005-05-25 | 保定浪拜迪电气股份有限公司 | A ferromagnetic resonance diagnostic eliminator of voltage transformer |
| CN104375025A (en) * | 2014-10-31 | 2015-02-25 | 国家电网公司 | Diagnostic method for ferromagnetic resonance in neutral non-grounding 10kV system |
| CN105552867A (en) * | 2015-12-21 | 2016-05-04 | 中国西电电气股份有限公司 | Device and method for inhibiting ferromagnetic resonance in high-voltage grid GIS |
Non-Patent Citations (2)
| Title |
|---|
| 苏智东等: "10KV线路低频减载保护误动原因分析", 《内蒙古电力技术》 * |
| 鲁铁成: "《电力系统过电压》", 30 June 2009, 中国水利水电出版社 * |
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Application publication date: 20170329 |