CN102721903A - Device and method for detecting turn-to-turn insulation failure of rotor winding of generator - Google Patents
Device and method for detecting turn-to-turn insulation failure of rotor winding of generator Download PDFInfo
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- CN102721903A CN102721903A CN2012101398089A CN201210139808A CN102721903A CN 102721903 A CN102721903 A CN 102721903A CN 2012101398089 A CN2012101398089 A CN 2012101398089A CN 201210139808 A CN201210139808 A CN 201210139808A CN 102721903 A CN102721903 A CN 102721903A
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Abstract
The invention discloses a device and a method for detecting a turn-to-turn insulation failure of a rotor winding of a generator. The detection device comprises a signal generator and a digital oscilloscope which are connected to two ends of the rotor winding respectively. Excitation signals are applied to one end of the rotor winding by using the signal generator, and response signals are outputted at the other end of the rotor winding. The response signals are received and displayed by using the digital oscilloscope, and the excitation signals and the response signals are recorded and stored by using the digital oscilloscope at the same time. Determining whether a rotor winding insulation failure exists by comparing the response signals outputted from the two ends of the rotor winding which are recorded and stored by using the digital oscilloscope. According to the invention, generator rotor insulation failure detection can be performed at project site, problems in the rotor turn-to-turn short circuit failure detection in generator maintenance at the project site are solved, and the device and the method can also be applied to rotor winding insulation detection in motor manufacturing phase at the same time.
Description
Technical field
The pick-up unit and the detection method of the relevant a kind of insulation fault of the present invention are meant a kind of pick-up unit and detection method to generator amature winding inter-turn insulation fault especially.
Background technology
Reason such as bad owing to workmanship, that maintenance is improper, operation maintenance is untimely; Insulation faults such as rotor ground fault, winding interturn short-circuit often take place in the generator amature winding; To the rotor ground fault fault; The general measurement insulation resistance of passing through is just tested and can be detected, for the generator rotor interturn short-circuit fault, though more existing detection methods; Like methods such as air gap coil method, AC impedance and power attenuation method, dc resistance method, zero load and short circuit curve test method(s)s, but all there is certain deficiency.Respectively as follows:
(1) AC impedence method and power attenuation method
The principle of the method is: when having turn-to-turn short circuit in the rotor winding; The short-circuit current of under the alternating voltage effect, flowing through in the short-circuited coil is big more many than normal current; This short-circuit current has strong demagnetizing effect, though the short circuit number of turn seldom the time effect also fairly obvious, in when, in the winding turn-to-turn short circuit taking place when; Its AC impedance descends greatly, and power attenuation obviously increases.Therefore,, or compared, can judge promptly whether winding exists turn-to-turn short circuit with former measured value through mutual comparison to each magnetic pole AC impedance value in the rotor winding.But the test of rotor winding AC impedance and power attenuation receives many factor affecting; The tightness degree that contacts with cell wall like the material of rotor slot wedge and slot wedge; Apply the influence of various factors such as height, experiment power supply frequency, Harmonic Waves component of voltage when also receiving stator added losses under the rotary state, rotor body remanent magnetism, test; To judging that slighter shorted-turn fault can not obtain accurate conclusion sometimes, especially the initial stage of turn-to-turn short circuit, can't detect; And the AC impedance of generator is huge especially because of the difference of when operation wriggling of causing of the centrifugal force that receives of coil etc. when dispatching from the factory in its back of putting into operation of dispatching from the factory; Generally can reach 5%, so high person even can reach 10% is AC impedence method even can't judge accurately whether generator rotor inter-turn short circuit takes place sometimes.
(2) dc resistance method
The direct current resistance of measuring the rotor winding also can detect generator rotor interturn short-circuit; Regulation in China's " power equipment preventive trial rules "; Should under cold conditions, measure the direct current resistance of rotor winding during the generator overhaul; With first (handing-over or overhaul) result that surveys of institute comparison, its difference should be above 2%.In theory, when winding generation turn-to-turn short circuit, the dc resistance of rotor winding can reduce; But because of the total number of turns of generator amature winding more, if wherein have only one, two circle short circuits, even measure very accurate; Direct current resistance reduces value and also is no more than 1%, and therefore, the sensitivity of dc resistance method is very low comparatively speaking; Can not be as the main method of diagnosis turn-to-turn short circuit, the reference in the time of can only be as comprehensive diagnos.
(3) air gap coil probe method
This method is that the Albright by the U.S. put forward in 1971 the earliest.It is detecting coil to be contained in the stator and rotor air gap (also claim air gap coil), so both can measure the radial component of magnetic flux, also can measure the tangential component of magnetic flux.Its ultimate principle is to carry out differential to the rotating magnetic field in the power generator air gap through air gap coil, then this differential signal is introduced oscillograph and analyzes.Because the waveform behind the different rotating magnetic field signal differentiations is different; Particularly normal and failure condition has very big difference; So to differentiated waveform analysis is diagnosablely to go out the rotor winding and whether have shorted-turn fault, the auxiliary position that can also accurately demonstrate the fault groove of positioning signal in addition.
Under the generator belt loading condition, because armature reaction is disturbed, Effect on Detecting is also not obvious, and accuracy in detection is also relatively poor, and the air gap coil probe method can only carry out under the situation of generator zero load and three-phase shortcircuit.This method can only be under the rotation status at rotor to be measured, and stationary state can not adopt, so can not adopt before rotor is installed and during semi-manufacture, this method is fit to the motor on-line monitoring.Reach in the newly-designed motor but domestic most power plant is existing, this measurement coil seldom is housed, and also more complicated of this coil is installed, the stop time that needs is also very long.
(4) unloaded and short circuit curve test method(s)
Utilize generator unloaded with the short circuit curve test normal and malfunction following the parameter value of surveying and characteristic curve different judge whether to take place the rotor interturn short-circuit fault.When rotor winding generation turn-to-turn short circuit, its three phase short circuit characteristic, no-load characteristic and do not compare before the short circuit, slope will descend; But owing to receive the restriction of measuring accuracy, generally surpass 3%～5% o'clock of total number of turns, could on unloaded and short-circuit characteristic, reflect in the rotor short circuit in winding number of turn.So, similar with dc resistance method, unloaded also sensitive inadequately to the detection of shorted-turn fault with the short circuit curve method, can only have or not one of method of turn-to-turn short circuit as comprehensive judgement generator amature winding.
The sensitivity of above-mentioned several kinds of detection methods, complexity, the order of accuarcy of localization of fault and the overall performance of detection method that test detects are assessed; Dc resistance method and AC impedence method can be shut down Static Detection, but detection accuracy, sensitivity are not high.Unloaded and short circuit curve test method(s), air gap coil probe method are adapted at rotation status and detect, because influence factor is many, accuracy and sensitivity are not high yet.Generally do not take out rotor when especially genset is shut down light maintenance, in the stator thorax, seal, can only carry out simple straight resistance and AC impedance and power attenuation measurement, if detect inaccurate, will be totally unfavorable to generator operation safety.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide under a kind of shutdown quiescent conditions, generator amature no matter in the stator thorax with thorax outside, the pick-up unit and the detection method of the generator amature winding inter-turn insulation fault that can both accurately carry out.
For achieving the above object; The present invention provides a kind of pick-up unit of generator amature winding inter-turn insulation fault, and it includes signal generator and digital oscilloscope, and this signal generator and digital oscilloscope are connected in rotor winding two ends; This signal generator applies pumping signal to rotor winding one end; And at rotor winding other end output response signal, and by digital oscilloscope reception and this response signal of demonstration, the digital oscilloscope recording storage should encourage and response signal simultaneously; Through the difference by the response signal of rotor winding two ends output of comparative figures oscillograph recording storage, judge whether this rotor winding exists insulation fault.
Said signal generator one road output terminal is connected in said rotor winding one end and applies pumping signal; And from said rotor winding other end output response signal; Said digital oscilloscope one tunnel input channel connects the said rotor winding other end; The output line shield terminal of signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection; Said digital oscilloscope receives, shows and recording storage excitation and response signal; Utilize the mathematical operation function of digital oscilloscope, the two groups of response signal waveforms when rotor winding two ends add pumping signal respectively that obtain for twice are carried out mathematical subtraction obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
Preferably; Said digital oscilloscope is the digital oscilloscope of binary channels input pattern; The two ends of said rotor winding connect the two-way output terminal of said signal generator; The two ends of said rotor winding connect the two-way input channel of said digital oscilloscope simultaneously, the output line shield terminal of said signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection, and said signal generator applies synchronous identical pumping signal simultaneously by the two ends of rotor winding; The pumping signal that said each end of rotor winding applies is by rotor winding other end output response signal; And gather the response signal Wave data simultaneously through digital oscilloscope at rotor winding two ends, and two response signal Wave datas are subtracted each other obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
Said signal generator can produce the synchronous low pressure high-frequency pulse signal of two-way, and this pulse signal is a square wave, and the low pressure amplitude is 10V.
The present invention also provides a kind of detection method of generator amature winding inter-turn insulation fault, and it comprises the steps:
(1) connects signal generator and digital oscilloscope at the rotor winding two ends of motor;
(2) this signal generator applies pumping signal to rotor winding one end, and at rotor winding other end output response signal, and by digital oscilloscope reception and this response signal of demonstration, the digital oscilloscope recording storage should encourage and response signal simultaneously;
(3) through the difference by the response signal of rotor winding two ends output of comparative figures oscillograph recording storage, judge whether the rotor winding exists insulation fault.
In said step (1) and step (2); Said signal generator one road output terminal is connected in said rotor winding one end and applies pumping signal; And from said rotor winding other end output response signal; Said digital oscilloscope one tunnel input channel connects the said rotor winding other end, and said digital oscilloscope receives, shows and recording storage excitation and response signal, the output line shield terminal of said signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection; Position at said rotor winding two ends exchange signal generator and digital oscilloscope repeats one-shot measurement; In said step (3); Utilize the mathematical operation function of digital oscilloscope; The two groups of response signal waveforms when rotor winding two ends add pumping signal respectively that obtain for twice are carried out mathematical subtraction obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
Preferably; Said digital oscilloscope is the digital oscilloscope of binary channels input pattern; In said step (1), the two ends of said rotor winding connect the two-way output terminal of said signal generator, and the two ends of said rotor winding connect the two-way input channel of said digital oscilloscope simultaneously; In said step (2); Said signal generator applies synchronous identical pumping signal simultaneously by the two ends of rotor winding; The pumping signal that said each end of rotor winding applies is by rotor winding other end output response signal; And gather the response signal Wave data simultaneously through digital oscilloscope, the output line shield terminal of said signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection at rotor winding two ends; In said step (3), utilize the mathematical operation function of digital oscilloscope, two response signal Wave datas that collect are simultaneously subtracted each other obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
If rotor insulation is good; Two response signals are basic identical, and the signature waveform that waveform subtracts each other is a level and smooth straight line, during rotor interturn short-circuit; Promptly have certain projection in the trouble spot, and the amplitude size of projection is just represented the order of severity of shorted-turn fault.
Said signal generator can produce the synchronous low pressure high-frequency pulse signal of two-way, and this pulse signal is a square wave, and the low pressure amplitude is 10V.
Whether the pick-up unit of generator amature winding inter-turn insulation fault of the present invention and detection method can exist fault to detect to generator rotor insulation at engineering site; Directly carry out at the collector ring of generator both positive and negative polarity; No matter rotor is in the stator thorax or outside the thorax, and motor light maintenance rotor also can carry out in thorax, need not shut down and tear end cap open, take out rotor; Detect directly accurately; Convenient and practical, the difficult problem of rotor inter-turn short circuit fault detect when having solved the engineering site generator maintenance, but also application of motor fabrication phase rotor winding insulation detection simultaneously.
Description of drawings
Fig. 1 is the structure principle chart of the pick-up unit embodiment one of generator amature winding inter-turn insulation fault of the present invention;
Fig. 2 is the structure principle chart of the pick-up unit embodiment two of generator amature winding inter-turn insulation fault of the present invention.
Embodiment
For ease of structure of the present invention, method and the effect that reaches are had further understanding, combine the accompanying drawing preferred embodiment that develops simultaneously to specify as follows at present.
The pick-up unit of rotor winding inter-turn insulation fault of the present invention; Comprise signal generator 3 and digital oscilloscope 4; Signal generator 3 and digital oscilloscope 4 are connected in the two ends of rotor winding 2, and this signal generator 3 applies pumping signal to rotor winding 2 one ends, and at rotor winding 2 other end output response signals; And by digital oscilloscope 4 receptions and this response signal of demonstration; Simultaneously digital oscilloscope 4 recording storage should excitation and response signal, through the difference by the response signal of rotor winding 2 two ends output of comparative figures oscillograph 4 recording storage, judges whether rotor winding 2 exists insulation fault.
As shown in Figure 1; The single-ended single-ended reception response signal of pumping signal that applies; Signal generator 3 one road output terminals are connected in rotor winding L 2 ends and apply pumping signal, and from rotor winding L 1 end output response signal, digital oscilloscope 4 one tunnel input channels connect rotor winding L 1 end; The output terminal shielding of signal generator 3 and shielding of digital oscilloscope 4 output terminals and rotor body 1 ground connection, digital oscilloscope 4 receive, show and recording storage excitation and response signal; Same method; Signal generator 3 one road output terminals are connected in rotor winding L 1 end and apply pumping signal; And from rotor winding L 2 end output response signals, digital oscilloscope 4 one tunnel input channels connect rotor winding L 2 ends, the output terminal shielding of signal generator 3 and shielding of digital oscilloscope 4 input ends and rotor body 1 one end ground connection; Digital oscilloscope 4 receives, shows and recording storage excitation and response signal, the Wave data of digital oscilloscope 4 twice recording storage response signal.Utilize the mathematical operation function of digital oscilloscope; The two groups of response signal waveforms when rotor winding two ends add pumping signal respectively that obtain for twice are carried out mathematical subtraction obtain signature waveform, if rotor insulation is good, two response signals are basic identical; The signature waveform that waveform subtracts each other is a level and smooth straight line; When having fault, promptly there is certain projection in the trouble spot, thereby can judges whether rotor insulation exists fault.
As shown in Figure 2; Both-end applies the pumping signal both-end and receives response signal; Rotor winding L 1, L2 two ends connect the two-way output terminal of signal generator 3; Rotor winding L 1, L2 two ends connect two defeated road input channels of digital oscilloscope 4 simultaneously; The output terminal shielding of signal generator 3 and shielding of digital oscilloscope 4 input ends and rotor body 1 one end ground connection, signal generator 3 applies synchronous identical pumping signal simultaneously by the two ends of rotor winding 2, and the pumping signal that rotor winding 2 each end apply is by rotor winding 2 other end output response signals; Gather the response signal Wave data at rotor winding 2 two ends through digital oscilloscope 4 simultaneously, and two Wave datas are subtracted each other the signature waveform that obtains under the binary channels input pattern.If rotor insulation is good, the two ends response signal is basic identical, and the signature waveform that waveform subtracts each other also is a level and smooth straight line, when having fault, promptly has certain projection in the trouble spot, thereby can judge whether rotor insulation exists fault.
The variation that the essence of above-mentioned two methods is based on the wave impedance of rotor winding detects; The degree of short circuit of turn-to-turn short circuit reflects through the variation size of the wave impedance at place, trouble spot; The projection degree that is detected two waveform composite diagrams is judged; It is unusual that bossed place explains that promptly turn-to-turn exists, and the amplitude size of projection is just represented the order of severity of shorted-turn fault.
Signal generator among the present invention is a multifunctional signal generator, can produce the synchronous low pressure high-frequency pulse signal of two-way, and type is a square wave, and the low pressure amplitude is to get final product about 10V, and in second kind of scheme, digital oscilloscope is the digital oscilloscope of binary channels input pattern.
The detection method of the generator amature winding inter-turn insulation fault among the present invention is based on the ripple transmission theory; Utilize the continuous repetition pulse of multifunctional signal generator output low pressure respectively in the two ends incident of rotor winding; The method of utilizing digital oscilloscope to receive respectively at the other end; Compare the difference that receives response signal for twice through digital oscilloscope, relatively judge rotor insulation fault degree and position; Utilize signal generator to apply synchronous same pulse simultaneously at the generator amature two ends in addition; Utilize digital oscilloscope in two response signals of two ends of rotor survey record simultaneously; And utilize oscillograph to carry out necessary mathematical operation; Obtain signature waveform, compare and judge whether the rotor winding exists insulation fault.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (9)
1. the pick-up unit of a generator amature winding inter-turn insulation fault; It is characterized in that it includes signal generator and digital oscilloscope, this signal generator and digital oscilloscope are connected in rotor winding two ends; This signal generator applies pumping signal to rotor winding one end; And at rotor winding other end output response signal, and by digital oscilloscope reception and this response signal of demonstration, the digital oscilloscope recording storage should encourage and response signal simultaneously; Through the difference by the response signal of rotor winding two ends output of comparative figures oscillograph recording storage, judge whether this rotor winding exists insulation fault.
2. the pick-up unit of generator amature winding inter-turn insulation fault as claimed in claim 1; It is characterized in that; Said signal generator one road output terminal is connected in said rotor winding one end and applies pumping signal; And from said rotor winding other end output response signal, said digital oscilloscope one tunnel input channel connects the said rotor winding other end, the output line shield terminal of signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection; Said digital oscilloscope receives, shows and recording storage excitation and response signal; Utilize the mathematical operation function of digital oscilloscope, the two groups of response signal waveforms when rotor winding two ends add pumping signal respectively that obtain for twice are carried out mathematical subtraction obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
3. the pick-up unit of generator amature winding inter-turn insulation fault as claimed in claim 1; It is characterized in that; Said digital oscilloscope is the digital oscilloscope of binary channels input pattern; The two ends of said rotor winding connect the two-way output terminal of said signal generator; The two ends of said rotor winding connect the two-way input channel of said digital oscilloscope simultaneously, the output line shield terminal of said signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection, and said signal generator applies synchronous identical pumping signal simultaneously by the two ends of rotor winding; The pumping signal that said each end of rotor winding applies is by rotor winding other end output response signal; And gather the response signal Wave data simultaneously through digital oscilloscope at rotor winding two ends, and two response signal Wave datas are subtracted each other obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
4. the pick-up unit of generator amature winding inter-turn insulation fault as claimed in claim 1 is characterized in that, said signal generator can produce the synchronous low pressure high-frequency pulse signal of two-way, and this pulse signal is a square wave, and the low pressure amplitude is 10V.
5. the detection method of a generator amature winding inter-turn insulation fault is characterized in that it comprises the steps:
(1) connects signal generator and digital oscilloscope at the rotor winding two ends of motor;
(2) this signal generator applies pumping signal to rotor winding one end, and at rotor winding other end output response signal, and by digital oscilloscope reception and this response signal of demonstration, the digital oscilloscope recording storage should encourage and response signal simultaneously;
(3) through the difference by the response signal of rotor winding two ends output of comparative figures oscillograph recording storage, judge whether the rotor winding exists insulation fault.
6. the detection method of generator amature winding inter-turn insulation fault as claimed in claim 5; It is characterized in that; In said step (1) and step (2); Said signal generator one road output terminal is connected in said rotor winding one end and applies pumping signal, and from said rotor winding other end output response signal, said digital oscilloscope one tunnel input channel connects the said rotor winding other end; Said digital oscilloscope receives, shows and recording storage excitation and response signal; The output line shield terminal of said signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection, the position at said rotor winding two ends exchange signal generator and digital oscilloscope repeats one-shot measurement; In said step (3); Utilize the mathematical operation function of digital oscilloscope; The two groups of response signal waveforms when rotor winding two ends add pumping signal respectively that obtain for twice are carried out mathematical subtraction obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
7. the detection method of generator amature winding inter-turn insulation fault as claimed in claim 5; It is characterized in that; Said digital oscilloscope is the digital oscilloscope of binary channels input pattern; In said step (1), the two ends of said rotor winding connect the two-way output terminal of said signal generator, and the two ends of said rotor winding connect the two-way input channel of said digital oscilloscope simultaneously; In said step (2); Said signal generator applies synchronous identical pumping signal simultaneously by the two ends of rotor winding; The pumping signal that said each end of rotor winding applies is by rotor winding other end output response signal; And gather the response signal Wave data simultaneously through digital oscilloscope, the output line shield terminal of said signal generator and digital oscilloscope incoming line shield terminal and rotor body ground connection at rotor winding two ends; In said step (3), utilize the mathematical operation function of digital oscilloscope, two response signal Wave datas that collect are simultaneously subtracted each other obtain signature waveform, judge according to signature waveform whether rotor insulation exists fault.
8. like the detection method of claim 6 or 7 described generator amature winding inter-turn insulation faults; It is characterized in that if rotor insulation is good, two response signals are basic identical; The signature waveform that waveform subtracts each other is a level and smooth straight line; During rotor interturn short-circuit, promptly have certain projection in the trouble spot, and the amplitude size of projection is just represented the order of severity of shorted-turn fault.
9. the pick-up unit of generator amature winding inter-turn insulation fault as claimed in claim 5 is characterized in that, said signal generator can produce the synchronous low pressure high-frequency pulse signal of two-way, and this pulse signal is a square wave, and the low pressure amplitude is 10V.
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| CN2012101398089A CN102721903A (en) | 2012-05-08 | 2012-05-08 | Device and method for detecting turn-to-turn insulation failure of rotor winding of generator |
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| CN2012101398089A CN102721903A (en) | 2012-05-08 | 2012-05-08 | Device and method for detecting turn-to-turn insulation failure of rotor winding of generator |
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