CN1560639A - Voltage mutual inductor ferromagnetic resonant diagnosis and deresonant method - Google Patents
Voltage mutual inductor ferromagnetic resonant diagnosis and deresonant method Download PDFInfo
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- CN1560639A CN1560639A CNA2004100061514A CN200410006151A CN1560639A CN 1560639 A CN1560639 A CN 1560639A CN A2004100061514 A CNA2004100061514 A CN A2004100061514A CN 200410006151 A CN200410006151 A CN 200410006151A CN 1560639 A CN1560639 A CN 1560639A
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Abstract
The invention is a voltage mutual inductor ferromagnetic resonance diagnosing and eliminating method, which belongs to control technology field, which is used to overcome the problem that the traditional resonance diagnosis is apt to occur error. It uses the base supplementary coil, assistant supplementary coil of the voltage mutual inductor to measure the line voltage, phase voltage and the voltage of the assistant coil of the system, according to the value of the voltage mutual inductor aperture triangle voltage, and uses the shortcut triangle windings aperture as the path for eliminating the ferromagnetic resonance, the improved project leads in a value of A, B, C three phases voltage in a electric system as another gist parameter, if the voltage of the aperture triangle is 30-100V, the three phases voltage of A, B, C surpasses the normal value, then, judges there has ferromagnetic occurrence.
Description
Technical field:
The present invention relates to a kind of ferroresonance Fault Diagnosis and removing method that is used for mutual inductor, belong to the control technology field.
Background technology:
Voltage transformer (VT) is an equipment commonly used in the electric system, and the electric capacity that exists in its access meeting and the system is formed the oscillation circuit of numerous complicated.Because the nonlinear characteristic of electromagnetic potential transformer when satisfying certain condition, just might excite ferro-resonance over-voltage.The frequency of ferroresonance can be a first-harmonic, also can be higher hamonic wave (being generally 3 frequencys multiplication) or subharmonic (being generally 3 frequency divisions, 2 frequency divisions etc.).When the electric system generation ferroresonance at mutual inductor place, often cause voltage transformer (VT) to burn or explode, cause serious accident.For this reason, traditional solution is that serial connection bulb or resistance are decayed on mutual inductor open delta winding.This method is that a complicated problems is packed simply, so that can't make diagnosis accurately at particular problem, can not tackle the problem at its root.
For this reason, a kind of analog harmonic elimination apparatus arises at the historic moment, and it can eliminate the ferroresonance of a certain characteristic frequency, yet but often because of the arc grounding misoperation.Subsequently, people propose a kind of harmonic elimination method of microcomputer-based intelligentization again, and so the foundation of its judgement is still the numerical value of voltage transformer (VT) open delta voltage.During voltage transformer (VT) generation ferroresonance, it only is one of fault feature that voltage appears in open delta, when high-pressure side fuse blows or generation systems resonance take place for system's generation single-phase earthing, voltage transformer (VT), open delta all voltage will occur, and this moment, this harmonic elimination apparatus as criterion inevitably also misoperation, false alarm will take place.
In addition,, cause the diversity of resonance frequency, show as resonance, industrial frequency resonance, the frequency tripling resonance of three frequency division resonance, two divided-frequency and near frequency thereof owing to the complicacy of the resonant tank and the resonance origin cause of formation, or the like.And common harmonic elimination apparatus only can be eliminated the resonance of a certain frequency and can not eliminate the resonance of various frequencies fully, so that produces malfunction or tripping.
Summary of the invention
Provide a kind of thereby the present invention is used to overcome the defective that traditional resonance diagnosis is easy to report by mistake and can accurately diagnose the diagnosis of voltage transformer (VT) ferroresonance and the harmonic elimination method that can reliably carry out harmonic elimination ferroresonance.
The technical scheme that addresses the above problem is:
A kind of diagnosis of voltage transformer (VT) ferroresonance and harmonic elimination method, it utilizes the basic secondary coil of voltage transformer (VT), auxiliary secondary coil comes the line voltage of measuring system, phase voltage, with auxiliary secondary coil be the voltage of open delta winding, numerical value with the voltage transformer (VT) open delta voltage is foundation, and with the approach of short circuit triangle winding opening as the elimination ferroresonance, it is improved to, it also introduces the A of electric system, B, the numerical value of C three-phase voltage is another parameter, if detecting the voltage of open delta is 30～100V, A, B, the C three-phase voltage exceeds normal value, then is judged as ferroresonance and takes place.
The diagnosis of above-mentioned voltage transformer (VT) ferroresonance and harmonic elimination method raise simultaneously as if detection A, B, C three-phase voltage, and superpotential is that electric current is little more than 3 times, then is judged as frequency tripling resonance.
The diagnosis of above-mentioned voltage transformer (VT) ferroresonance and harmonic elimination method, two phase voltages raise in A, B, the C three-phase if detect, and a phase voltage reduces, and superpotential is 2～3 times, then is judged as first-harmonic resonance.
The diagnosis of above-mentioned voltage transformer (VT) ferroresonance and harmonic elimination method, if detect A, B, the rising of C three-phase voltage, its numerical value is the twice overvoltage, overcurrent reaches 30-50 doubly, then is judged as Subharmonic Resonance.
The diagnosis of above-mentioned voltage transformer (VT) ferroresonance and harmonic elimination method if detect A, B, C three-phase voltage value is constant, the open delta voltage value is constant, and have the negative sequence voltage greater than 8 volts, then are judged as only voltage transformer (VT) high-pressure side fuse blows; If it is zero, open delta no-voltage that detection A, B, C three-phase voltage have a phase phase voltage mutually, then be judged as only voltage transformer (VT) low-pressure side fuse blows; If detect A, B, C three-phase voltage, calculate 30～100 residual voltages, the open delta no-voltage then is judged as only open delta loop fuse blows.
According to diagnosis provided by the invention and harmonic elimination method, on the basis of introducing the voltage transformer (VT) open delta voltage, introduced the variable of system A, B, C three-phase voltage again, by detecting this two variablees, greatly standard the criterion of fault type diagnosis, report to the police, trigger the harmonic elimination apparatus correct operation for accurately making ferroresonance, eliminate the action mistaken ideas that exist the assurance on the principle is provided.
Embodiment
Below with the invention will be further described.
The present invention is on the basis of abundant research ferroresonance mechanism, is fully recognized that Subharmonic Resonance is subjected to certain disturbance and causes under the excitation of the electromotive force that produces at the power supply neutral point.After deliberation, the frequency of resonance can be power frequency divided by certain integer, being 1/2nd frequency divisions and not being integral multiple of the easiest generation wherein, but, often be 24-24.5-24.8Hz, viewing system ratio of damping and deciding a little less than 1/2nd power frequencies.Three-phase voltage raises simultaneously during Subharmonic Resonance; But superpotential is not high, is about the twice overvoltage, and the electric current of mutual inductor often can reach 30-50 doubly, and voltage transformer (VT) is exploded because of overheated.First-harmonic resonance shows as two phase voltages and raises, and a phase voltage reduces, and phenomenon by turns can take place, and superpotential is generally 2-3 doubly, and amplitude is not too high.Frequency tripling resonance three-phase voltage raises simultaneously, and general electric current is little, but superpotential is very high, often makes the voltage transformer (VT) insulation damages.Through above analysis, be not difficult to find: the drawing-in system three-phase voltage provides strong assistant criteria for the different resonance frequency of difference.
Common electromagnetic potential transformer comprises primary winding, basic secondary coil, auxiliary secondary coil, is used for line voltage, the phase voltage of measuring system and the residual voltage that occurs when single-phase earthing, and the present invention is no exception.Auxiliary secondary coil is the residual voltage that the open delta winding occurs when being used for measuring single-phase earthing, and voltage is zero when electric system normally moves.In order to protect voltage transformer (VT) itself to a certain extent; in its high-pressure side high-tension fuse often is housed; if because of some reason causes these fuse blows; a disconnected phase or two-phase insurance will make auxiliary secondary coil higher voltage value occur; this voltage has surpassed the setting valve of general protective device, directly causes these error action of device.Auxiliary secondary coil is that the open delta winding also is the unique channel that general electric resonance cancellation element is used for detecting resonance and harmonic elimination, and the situation of this kind situation open delta reflection during with industrial frequency resonance is identical, causes these harmonic elimination apparatus malfunctions.After introducing A, B, C three-phase voltage and detecting, then itself and resonance difference can be come, reason is: 1, being reflected to basic secondary coil during the fuse blows of high-pressure side is phase-deficient operation only, and the voltage of normal phase is constant, and open delta voltage also is a fixed value.But will follow A, B, C three-phase voltage during resonance with respect to just often marked change.2, will cause the negative sequence voltage that can from A, B, C three-phase, calculate, the fault signature that this just has when being the high-pressure side fuse blows during fuse blows greater than 8 volts.Therefore, utilize these 2 can be correct with clear and definite the making a distinction of this fault of high-pressure side fuse blows with ferroresonance, and accurately report to the police, prompting Operation of Electric Systems personnel in time change the high-pressure side insurance, eliminate operation hidden danger.
The low-pressure side A of voltage transformer (VT), B, C three-phase are equipped with fuse equally; though open delta voltage can not occur during their fusing; but some table meters, protection, the automation equipment of transformer station can not normally be used, can not ignore equally so in time find the importance of this fault.Its fault signature shows as the open delta no-voltage, the phase voltage that fuse does not fuse is a normal value, the phase voltage of fusing is zero, can accurately report to the police to low-pressure side A, B, the fusing of C three-phase fuse of voltage transformer (VT) accurately with above this device of principle, prompting Operation of Electric Systems personnel in time change the low-pressure side insurance, eliminate operation hidden danger.
The system that has also is equipped with insurance in voltage transformer (VT) open delta one side; and common harmonic elimination apparatus promptly utilizes the open delta winding as the unique channel that detects resonance and harmonic elimination fully; if this insurance is in case fusing; this class device will lose its harmonic elimination effect at once; voltage transformer (VT) will lose protection, be placed in breakneck condition.This method detects by introducing A, B, C three-phase voltage and has just solved this problem very easily.We know; when electric system is broken down (during phase fault; the open delta no-voltage does not promptly have zero-sequence network, but this fault will can excise faulty line by protected device immediately owing to some other notable attribute from system, and system recovery is normally moved.So this kind situation does not influence the correct warning of harmonic elimination apparatus, can not consider.For example during single-phase earthing, the voltage of 30-100 volt will appear in open delta, and this voltage is residual voltage, and device can be collected by open delta, also can be calculated and be got by A, B, C three-phase, and these two values should equate.If calculate residual voltage by A, B, C three-phase, open delta does not collect any voltage then can judge open delta loop fuse melting.With above principle, this method can accurately be reported to the police to voltage transformer (VT) open delta one side fuse blows accurately, and prompting Operation of Electric Systems personnel in time change insurance, eliminate operation hidden danger.
Be not difficult to find by above analysis, after introducing A, B, C three-phase voltage, this method even this situation that can all fuse to all fuses of voltage transformer (VT) are reported to the police, it shows as the open delta no-voltage, A, B, C three-phase no-voltage, this situation is identical with the type of alarm of low-pressure side A, B, the fusing of C three-phase fuse.
Another situation that makes general harmonic elimination apparatus malfunction easily is system's single-phase earthing, during electric system generation single-phase earthing, the voltage of 30-100 volt appears in open delta, this voltage is residual voltage, for with the harmonic elimination apparatus of open delta voltage as the unique channel that is used for detecting resonance and harmonic elimination, the inevitable malfunction of this situation undoubtedly, this method is introduced A, B, C three-phase voltage and then this fault type can be rejected and accurately report to the police, reason is: when 1, single-phase earthing taking place, the voltage that open delta occurs is the 30--100 volt; 2, the voltage that collects of the residual voltage that calculates of A, B, C three-phase and open delta is basic identical; 3, the negative sequence voltage that is calculated by A, B, C three-phase is less than 8 volts.Judgement by above three aspects can be with clear and definite being diagnosed, accurately reporting to the police of single-phase earthing.
From above analysis as can be seen, this method by introduce A, B,, the C three-phase voltage, successful solution the series of technical that exists in the existing diagnosis harmonic elimination method, be the brand new technical solution that instructs the various voltage transformer (VT) ferroresonances diagnosis of design, harmonic elimination apparatus.
Claims (5)
1. the diagnosis of a voltage transformer (VT) ferroresonance and harmonic elimination method, it utilizes the basic secondary coil of voltage transformer (VT), auxiliary secondary coil comes the line voltage of measuring system, phase voltage, with auxiliary secondary coil be the voltage of open delta winding, numerical value with the voltage transformer (VT) open delta voltage is foundation, and with the approach of short circuit triangle winding opening as the elimination ferroresonance, it is characterized in that, it introduces the A of electric system, B, the numerical value of C three-phase voltage is another parameter, if recording the voltage of open delta is 30～100V, A, B, the C three-phase voltage exceeds normal value, then is judged as ferroresonance and takes place.
2. the diagnosis of voltage transformer (VT) ferroresonance according to claim 1 and harmonic elimination method is characterized in that, if record A, B, the rising of C three-phase voltage, its numerical value is the twice overvoltage, and overcurrent reaches 30-50 doubly, then is judged as Subharmonic Resonance.
3. the diagnosis of voltage transformer (VT) ferroresonance according to claim 1 and harmonic elimination method is characterized in that, if record A, B, the C three-phase voltage raises simultaneously, superpotential is that electric current is little more than 3 times, then is judged as frequency tripling resonance.
4. the diagnosis of voltage transformer (VT) ferroresonance according to claim 1 and harmonic elimination method is characterized in that, two phase voltages raise in A, B, the C three-phase if record, and a phase voltage reduces, and superpotential is 2～3 times, then is judged as first-harmonic resonance.
5. the diagnosis of voltage transformer (VT) ferroresonance according to claim 1 and harmonic elimination method, it is characterized in that, if record A, B, C three-phase voltage value is constant, the open delta voltage value is constant, and the negative sequence voltage greater than 8 volts is arranged, then be judged as only voltage transformer (VT) high-pressure side fuse blows; Have mutually that a phase phase voltage is zero, the open delta no-voltage if record A, B, C three-phase voltage, then be judged as only voltage transformer (VT) low-pressure side fuse blows; If record A, B, C three-phase voltage, calculate 30～100 volts of residual voltages, the open delta no-voltage then is judged as only open delta loop fuse blows.
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| CNA2004100061514A CN1560639A (en) | 2004-03-04 | 2004-03-04 | Voltage mutual inductor ferromagnetic resonant diagnosis and deresonant method |
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| CNA2004100061514A CN1560639A (en) | 2004-03-04 | 2004-03-04 | Voltage mutual inductor ferromagnetic resonant diagnosis and deresonant method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323647A (en) * | 2013-06-07 | 2013-09-25 | 国家电网公司 | Device and method for monitoring classified insulation electromagnetic type PT primary side current |
| CN106324407A (en) * | 2016-09-28 | 2017-01-11 | 国家电网公司 | Voltage transformer's second harmonic elimination device detector |
| CN108318762A (en) * | 2018-02-28 | 2018-07-24 | 南京南瑞继保电气有限公司 | The method of discrimination of voltage transformer power frequency ferromagnetic resonance |
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
| CN113176475A (en) * | 2021-06-03 | 2021-07-27 | 南通通明集团有限公司 | Distributed power supply power transmission and distribution line fault detection method |
| CN116706839A (en) * | 2023-06-08 | 2023-09-05 | 深圳瑞能电气设备有限公司 | Microcomputer electric power resonance diagnosis eliminating device and eliminating method thereof |
-
2004
- 2004-03-04 CN CNA2004100061514A patent/CN1560639A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323647A (en) * | 2013-06-07 | 2013-09-25 | 国家电网公司 | Device and method for monitoring classified insulation electromagnetic type PT primary side current |
| CN103323647B (en) * | 2013-06-07 | 2015-12-09 | 国家电网公司 | Graded insulation Electromagnetic PT primary side current monitoring device and method |
| CN106324407A (en) * | 2016-09-28 | 2017-01-11 | 国家电网公司 | Voltage transformer's second harmonic elimination device detector |
| CN106324407B (en) * | 2016-09-28 | 2023-07-25 | 国家电网公司 | Detector for secondary resonance elimination device of voltage transformer |
| CN108318762A (en) * | 2018-02-28 | 2018-07-24 | 南京南瑞继保电气有限公司 | The method of discrimination of voltage transformer power frequency ferromagnetic resonance |
| CN108318762B (en) * | 2018-02-28 | 2020-09-08 | 南京南瑞继保电气有限公司 | Method for judging power frequency ferromagnetic resonance of voltage transformer |
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
| CN110007261B (en) * | 2019-03-14 | 2024-03-19 | 国网新疆电力有限公司昌吉供电公司 | Device and method for judging fusing of primary side high-voltage fuse of voltage transformer |
| CN113176475A (en) * | 2021-06-03 | 2021-07-27 | 南通通明集团有限公司 | Distributed power supply power transmission and distribution line fault detection method |
| CN116706839A (en) * | 2023-06-08 | 2023-09-05 | 深圳瑞能电气设备有限公司 | Microcomputer electric power resonance diagnosis eliminating device and eliminating method thereof |
| CN116706839B (en) * | 2023-06-08 | 2024-02-06 | 深圳瑞能电气设备有限公司 | Microcomputer electric power resonance diagnosis eliminating device and eliminating method thereof |
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