CN105203912A - Steep front edge index repeat pulse generating device used for generator rotor inter-turn short circuit - Google Patents
Steep front edge index repeat pulse generating device used for generator rotor inter-turn short circuit Download PDFInfo
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- CN105203912A CN105203912A CN201510707741.8A CN201510707741A CN105203912A CN 105203912 A CN105203912 A CN 105203912A CN 201510707741 A CN201510707741 A CN 201510707741A CN 105203912 A CN105203912 A CN 105203912A
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Abstract
The invention discloses a steep front edge index repeat pulse generating device used for generator rotor inter-turn short circuit. The steep front edge index repetitive pulse generation device comprises an AC power socket, an industrial frequency transformer, a repeat pulse generation unit and a load resistor; a contact point N and a contact point L on the AC power socket are respectively connected with two ends of a primary side winding in the industrial frequency transformer, and a contact point G on the AC power socket is grounded; a secondary side winding in the industrial frequency transformer is connected with the input end of a repeat pulse generation unit; the output end of the repeat pulse generation unit is connected with two ends of the load resistor; the repeat pulse generation unit comprises a pulse front edge adjusting capacitor for adjusting high-frequency repeat pulse front edge and a pulse back edge adjusting capacitor for adjusting high-frequency repeat pulse back edge. Through the adoption of the device, the detection accuracy for generator rotor inter-turn short circuit and the positioning accuracy are higher.
Description
Technical field
The invention belongs to Electric Power Equipment Insulation monitoring technical field, relate to a kind of steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings.
Background technology
Now, world's generated energy about 80% is provided by turbodynamo.Along with developing rapidly of China's power industry, large turbo-type generator has become main force's unit of domestic a few bulk power grid at present.According to document display, in national installed gross capacity of generating equipments in 2009, the fired power generating unit of 100MW and above capacity accounts for 80.38% of thermoelectricity installation total volume.But the maximization of generating set must cause single-machine capacity to account for the increase of electrical network total volume ratio, and large-scale steamer generating set reliability of operation and security are particularly important and outstanding, and it directly affects the stable operation of generating plant.Once such unit breaks down, particularly pernicious fault, brings huge economic loss will to electric system and national economy.
In each ingredient of large turbo-type generator, rotor is in High Rotation Speed state, subjects very large mechanical stress and thermal load, just seems particularly important to the fault detect of rotor.Because the processing technology in manufacture process is bad and the impact of all kinds of electromechanics effect in running, the rotor windings of large turbo-type generator often there will be the contact between circle and circle, namely causes the generation of rotor interturn short-circuit fault.Operating rotor interturn short-circuit fault is one more common in all kinds of fault of generator at the scene, is also one of major reason affecting safe operation.
Rotor windings exists slight turn-to-turn short circuit will cause that exciter current of generator raises, reactive power declines relatively, bearing unbalance vibration increases.Once the order of severity of rotor inter-turn short circuit increases, will cause the generation of rotor a bit even two points ground fault fault, make rotor main shaft's magnetizing, severe patient also will be burnt axle journal and bearing shell, form grave danger to the safe and stable operation of unit itself.In view of the foregoing, industry member has carried out correlative study to rotor of steam turbo generator shorted-turn fault.
The information that patent of invention 03148934.6 is generated by magnetic flux detector identifies Short Circuit Between Generator Rotor Windings automatically, and sends relevant information by alarm function to teleoperator.Patent of invention CN201310153154.X discloses a kind of Short Circuit Between Generator Rotor Windings method for diagnosing faults and system, carries out assessment of failure and judgement according to the feature difference under generator amature normal condition and malfunction.CN102721903 discloses a kind of pick-up unit and detection method thereof of generator amature insulation between coils fault, carries out Site Detection using signal generator and digital oscilloscope as nucleus module.Patent of invention CN102809727A proposes a kind of Short Circuit Between Generator Rotor Windings fault detection method based on Frequency Response Analysis, the transition-line analogy pulse propagation characteristic in the rotor consisted of a RLC, analyzes rotor turn-to-turn fault.Patent of invention CN103823150A proposes a kind of rotor of steam turbo generator interturn short-circuit failure diagnosing method based on multisensor associating, the various faults characteristic parameter utilizing the dissimilar sensor being installed on the multiple position of generator to gather and respective threshold value calculate respectively, obtain fault eigenvalue when diagnosing according to often kind of Failure Characteristic Parameter, then the reliability according to different diagnostic method assigns weight to each fault eigenvalue, rotor interturn short-circuit fault whether is there is eventually through the size identification turbodynamo comparing this weighted sum and composite thresholds.Patent of invention CN104155567 discloses a kind of localization method of double-fed type Short Circuit Between Generator Rotor Windings abort situation, to be numbered and to determine localization of fault by detecting coil and electrooptical device to generator amature groove.Patent of invention CN104808142A discloses a kind of device and method of simulating double-fed generator amature short trouble, the each short trouble type of double-fed generator amature can be simulated, and the structure of generator used is identical with the structure of true double-fed generator, achieves the simulation of controlled each short trouble.
From technical characteristic disclosed in above-mentioned patent, its research emphasis is mainly means and the diagnostic method of Site Detection, but rising edge steepness and the pulse width of current generator rotor inter-turn short circuit trouble-shooter can not adjust and cause turn-to-turn fault position to locate the problem of misalignment, but achievement in research for detecting instrument performance boost aspect own in prior art is less, but how is improved by the design of detecting instrument and detect data accurately and lack scarcity very.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings, this device to the detection of Short Circuit Between Generator Rotor Windings and positioning precision higher.
For achieving the above object, the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings of the present invention comprises AC power supplies socket, Industrial Frequency Transformer, repetition pulse generating unit and pull-up resistor; Contact point on AC power supplies socket and contact point are connected with the two ends of limit, Industrial Frequency Transformer Central Plains winding respectively, contact point ground connection on AC power supplies socket, vice-side winding in Industrial Frequency Transformer is connected with the input end of repetition pulse generating unit, repetition pulse generating unit output terminal is connected with the two ends of pull-up resistor, comprises for regulating the pulse front edge control capacittance in high frequency repetition pulse forward position and for regulating the pulse back edge control capacittance on edge after high frequency repetition pulse in repetition pulse generating unit.
Described repetition pulse generating unit also comprises thyristor, the first diode, the second diode, the 5th diode, the 4th diode, the 3rd diode, resistance and electric capacity;
In Industrial Frequency Transformer, the two ends of vice-side winding are connected with the anode of the first diode and the anode of the second diode respectively, one end of resistance and the negative electrode of the first diode, the negative electrode of the second diode, one end of electric capacity is connected, the other end of resistance and one end of pulse front edge control capacittance, the anode of the 5th diode and the anode of thyristor are connected, the negative electrode of the 5th diode is connected with the negative electrode of the 4th diode, the gate pole of thyristor is connected with the anode of the 4th diode, the negative electrode of thyristor and one end of pulse back edge control capacittance, the anode of the 3rd diode and one end of pull-up resistor are connected, the other end of pull-up resistor and the negative electrode of the 3rd diode, the other end of pulse back edge control capacittance, the other end of pulse front edge control capacittance and the other end of electric capacity are connected.
Described Industrial Frequency Transformer adopts racetrack core structure.
The voltage effective value at winding two ends, limit, Industrial Frequency Transformer Central Plains is 220V, and in Industrial Frequency Transformer, the voltage effective value at vice-side winding two ends is 80V.
Former limit winding in described Industrial Frequency Transformer and electrical isolation between vice-side winding.
The class of insulation of described Industrial Frequency Transformer is more than or equal to 2kV.
The present invention has following beneficial effect:
Steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings of the present invention in the course of the work, by the index rising edge of pulse front edge control capacittance and pulse back edge control capacittance adjustment high frequency repetition pulse, negative edge and pulse width, thus realize the adjustment of paired pulses rising edge steepness and pulse width, detection efficiency is high, improved the judgement order of accuarcy of initial time simultaneously by the leading-edge steepness of regulating impulse, and then realize the high precision test of Short Circuit Between Generator Rotor Windings and accurately locate.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is the circuit diagram of repetition pulse generating unit G in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings of the present invention comprises AC power supplies socket, Industrial Frequency Transformer T, repetition pulse generating unit G and pull-up resistor R2, contact point N on AC power supplies socket and contact point L is connected with the two ends of limit, Industrial Frequency Transformer T Central Plains winding respectively, contact point G ground connection on AC power supplies socket, vice-side winding in Industrial Frequency Transformer T is connected with the input end of repetition pulse generating unit G, repetition pulse generating unit G output terminal is connected with the two ends of pull-up resistor R2, the pulse front edge control capacittance C2 for regulating high frequency repetition pulse forward position is comprised in repetition pulse generating unit G, and for regulating the pulse back edge control capacittance C3 on edge after high frequency repetition pulse, described repetition pulse generating unit G also comprises thyristor S1, first diode D1, second diode D2, 5th diode D5, 4th diode D4, 3rd diode D3, resistance R1 and electric capacity C1, in Industrial Frequency Transformer T, the two ends of vice-side winding are connected with the anode of the first diode D1 and the anode of the second diode D2 respectively, one end of resistance R1 and the negative electrode of the first diode D1, the negative electrode of the second diode D2, one end of electric capacity C1 is connected, the other end of resistance R1 and one end of pulse front edge control capacittance C2, the anode of the 5th diode D5 and the anode of thyristor S1 are connected, the negative electrode of the 5th diode D5 is connected with the negative electrode of the 4th diode D4, the gate pole of thyristor S1 is connected with the anode of the 4th diode D4, the negative electrode of thyristor S1 and one end of pulse back edge control capacittance C3, the anode of the 3rd diode D3 and one end of pull-up resistor R2 are connected, the other end of pull-up resistor R2 and the negative electrode of the 3rd diode D3, the other end of pulse back edge control capacittance C3, the other end of pulse front edge control capacittance C2 and the other end of electric capacity C1 are connected.
In addition, described Industrial Frequency Transformer T adopts racetrack core structure, the voltage effective value at winding two ends, limit, Industrial Frequency Transformer T Central Plains is 220V, in Industrial Frequency Transformer T, the voltage effective value at vice-side winding two ends is 80V, former limit winding in Industrial Frequency Transformer T and electrical isolation between vice-side winding, the class of insulation of Industrial Frequency Transformer T is more than or equal to 2kV.
Concrete use procedure of the present invention is:
High frequency repetition pulse is sent by the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings of the present invention, and described repetition high-frequency impulse is acted on generator, the impulse response waveform of the generator inner ring collected, gather the impulse response waveform of generator outer shroud, the difference of the impulse response waveform of the impulse response waveform of generator inner ring and generator outer shroud is denoted as characteristic curve; When the peak value of characteristic curve or valuation are less than 5% of the peak value of generator outer shroud response wave shape, then generator amature non-fault is described, when the peak value of characteristic curve or valuation, there is single peak value and be greater than 5% of the peak value of generator outer shroud response wave shape when this peak-to-valley value, then illustrating that generator amature exists Single Point of Faliure; The peak value of characteristic curve or valley have multiple peak-to-valley value, and when the peak-to-valley value of characteristic curve is greater than 5% of the outer shroud peak value of response of generator, then what generator was described exists multipoint fault.
The present invention can carry out Site Detection to Short Circuit Between Generator Rotor Windings fault, and by regulating the circuit parameter of repetition pulse generating unit G easily, the forward position and the rear edge that realize high frequency repetition pulse regulate, and improve Site Detection effect and positioning precision.
Claims (6)
1. the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings, it is characterized in that, comprise AC power supplies socket, Industrial Frequency Transformer (T), repetition pulse generating unit (G) and pull-up resistor (R2), contact point N on AC power supplies socket and contact point L is connected with the two ends of Industrial Frequency Transformer (T) limit, Central Plains winding respectively, contact point (G) ground connection on AC power supplies socket, vice-side winding in Industrial Frequency Transformer (T) is connected with the input end of repetition pulse generating unit (G), repetition pulse generating unit (G) output terminal is connected with the two ends of pull-up resistor (R2), the pulse front edge control capacittance (C2) for regulating high frequency repetition pulse forward position is comprised in repetition pulse generating unit (G), and for regulating the pulse back edge control capacittance (C3) on edge after high frequency repetition pulse.
2. the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings according to claim 1, it is characterized in that, described repetition pulse generating unit (G) also comprises thyristor (S1), the first diode (D1), the second diode (D2), the 5th diode (D5), the 4th diode (D4), the 3rd diode (D3), resistance (R1) and electric capacity (C1);
In Industrial Frequency Transformer (T), the two ends of vice-side winding are connected with the anode of the first diode (D1) and the anode of the second diode (D2) respectively, one end of resistance (R1) and the negative electrode of the first diode (D1), the negative electrode of the second diode (D2), one end of electric capacity (C1) is connected, the other end of resistance (R1) and one end of pulse front edge control capacittance (C2), the anode of the 5th diode (D5) and the anode of thyristor (S1) are connected, the negative electrode of the 5th diode (D5) is connected with the negative electrode of the 4th diode (D4), the gate pole of thyristor (S1) is connected with the anode of the 4th diode (D4), the negative electrode of thyristor (S1) and one end of pulse back edge control capacittance (C3), the anode of the 3rd diode (D3) and one end of pull-up resistor (R2) are connected, the other end of pull-up resistor (R2) and the negative electrode of the 3rd diode (D3), the other end of pulse back edge control capacittance (C3), the other end of pulse front edge control capacittance (C2) and the other end of electric capacity (C1) are connected.
3. the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings according to claim 1, it is characterized in that, described Industrial Frequency Transformer (T) adopts racetrack core structure.
4. the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings according to claim 3, it is characterized in that, the voltage effective value at winding two ends, Industrial Frequency Transformer (T) limit, Central Plains is 220V, and in Industrial Frequency Transformer (T), the voltage effective value at vice-side winding two ends is 80V.
5. the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings according to claim 3, is characterized in that, the former limit winding in described Industrial Frequency Transformer (T) and electrical isolation between vice-side winding.
6. the steep-front index repetition pulse generating means for Short Circuit Between Generator Rotor Windings according to claim 3, it is characterized in that, the class of insulation of described Industrial Frequency Transformer (T) is more than or equal to 2kV.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510707741.8A CN105203912A (en) | 2015-10-27 | 2015-10-27 | Steep front edge index repeat pulse generating device used for generator rotor inter-turn short circuit |
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| CN201510707741.8A CN105203912A (en) | 2015-10-27 | 2015-10-27 | Steep front edge index repeat pulse generating device used for generator rotor inter-turn short circuit |
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| CN201510707741.8A Pending CN105203912A (en) | 2015-10-27 | 2015-10-27 | Steep front edge index repeat pulse generating device used for generator rotor inter-turn short circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106569080A (en) * | 2016-10-27 | 2017-04-19 | 国家电网公司 | Transformer inter-turn short circuit fault positioning method based on low-voltage pulse signals |
| CN106707093A (en) * | 2016-12-26 | 2017-05-24 | 国网甘肃省电力公司刘家峡水电厂 | Synchronization generator stator turn-to-turn short circuit detection method based on RSO method |
| CN112098891A (en) * | 2020-09-17 | 2020-12-18 | 国网新源控股有限公司北京十三陵蓄能电厂 | Repetitive pulse parameter optimization method and device for generator rotor turn-to-turn short circuit diagnosis |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106569080A (en) * | 2016-10-27 | 2017-04-19 | 国家电网公司 | Transformer inter-turn short circuit fault positioning method based on low-voltage pulse signals |
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| CN112098891A (en) * | 2020-09-17 | 2020-12-18 | 国网新源控股有限公司北京十三陵蓄能电厂 | Repetitive pulse parameter optimization method and device for generator rotor turn-to-turn short circuit diagnosis |
| CN112098891B (en) * | 2020-09-17 | 2023-06-30 | 国网新源控股有限公司北京十三陵蓄能电厂 | Repeated pulse parameter optimization method and device for generator rotor turn-to-turn short circuit diagnosis |
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Application publication date: 20151230 |