CN206975158U - A kind of detection means of generator rotor interturn short-circuit situation - Google Patents
A kind of detection means of generator rotor interturn short-circuit situation Download PDFInfo
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- CN206975158U CN206975158U CN201720839369.0U CN201720839369U CN206975158U CN 206975158 U CN206975158 U CN 206975158U CN 201720839369 U CN201720839369 U CN 201720839369U CN 206975158 U CN206975158 U CN 206975158U
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Abstract
The utility model discloses a kind of detection means of generator rotor interturn short-circuit situation, it includes being periodically sent out the repetition pulse detection unit of the precipitous repetition pulse waveform signal of low pressure and forward position, the search coil being placed between the stator of generator and rotor, the oscillograph being electrically connected with repetition pulse detection unit and search coil.When turn-to-turn short circuit occurs for generator amature winding, oscillograph shows the real-time characteristic response wave shape for characterizing rotor the two poles of the earth when turn-to-turn short circuit occurs for generator amature winding by receiving the output signal of repetition pulse detection unit, real time voltage waveforms of the air-gap flux when turn-to-turn short circuit occurs for generator amature winding characterized between stator and rotor also are shown by receiving the output signal of search coil, oscillograph also shows the target signature response wave shape and target voltage waveform being previously stored.Operating personnel is quickly compared by four waveforms of oscilloscope display, judges whether generator amature winding occurs turn-to-turn short circuit in time.
Description
Technical field
It the utility model is related to a kind of detection means, more particularly to a kind of inspection of generator rotor interturn short-circuit situation
Survey device.
Background technology
In large turbo-type generator electric fault, rotor interturn short-circuit failure is one of relatively common failure,
Shared large percentage.Influence of the slight rotor interturn short-circuit failure to unit normal operation less and fault signature not
Substantially, it is not easy to be run personnel's discovery, therefore such failure is often ignored.Once but Short Circuit Between Generator Rotor Windings failure
Continue to develop and deteriorate, the air-gap flux waveform of generator will distort, and cause the imbalance of stator side voltage, and generating electricity
Higher hamonic wave circulation is produced between two parallel branches of stator of machine, aggravates the heat condition of stator winding, influences the nothing of generator
Work(is contributed, and so as to cause the generation of the mechanical breakdowns such as unit vibration, shaft voltage rise is finally occurred, calcination rotor end bell, is occurred
Support and main shaft's magnetizing and and then the serious consequence of burn bearing shell and big axle.Therefore, how Accurate Diagnosis large-scale steamer is sent out for research
Motor rotor winding interturn short-circuit failure ensures power plant electricity for the potential safety hazard for power system stability operation of eliminating the effects of the act
The service life of main equipment is significant.
At present in power industry, for rotor of large turbo-type generator winding interturn short-circuit failure, main offline inspection
Survey method has following several.
(1) DC resistance method
According to existing DL/T 596《Power equipment preventive trial code》Regulation, in generator handing-over and each overhaul
When, the D.C. resistance for all tackling rotor windings measures (under cold conditions), and with initial data (factory data or handing-over data)
It is compared, its changing value is not to be exceeded 2%.In theory, when turn-to-turn short circuit occurs for rotor windings, DC resistance can drop
It is low.But because the total number of turns of rotor of large turbo-type generator is more (typically more than about 160 circles), if wherein there was only one or two circle hair
Raw short circuit, even if measurement is accurate enough, D.C. resistance reduced value is not more than 1%.Therefore, the shortcomings that DC resistance method it is spirit
Sensitivity is relatively low, and only when the short-circuit number of turn is more, DC resistance just shows obvious change.
(2) unloaded and short circuit curve test method(s)
Tested using generator is unloaded with short circuit curve, by comparing surveyed parameter value and indicatrix in normal or failure
Difference under state judges whether rotor interturn short-circuit failure occurs.But due to being limited by Instrument measuring precision, typically
When the rotor windings short-circuit number of turn exceedes the 3%~5% of total number of turns, could be reflected on unloaded and short-circuit characteristic,
The sensitivity of detection method is low.
(3) voltage drop method
Alternating current is passed through in rotor windings, the pole tension of rotor windings two is measured, if two pole tensions are equal, illustrates winding not
Turn-to-turn short circuit be present；If two pole tensions are unequal, illustrate that winding inter-turn has short trouble.For Wound-rotor type and with radial logical
The rotor of air holes, very easily it can be measured using the method, and for the generator amature of other forms, only tearing open
Could adopting said method during lower ferrule.I.e. detection method is poor for applicability, is not suitable for the popularization and application in power industry.
(4) be open transformer method
Rotor is placed in outside stator thorax, led to alternating current in rotor windings by slip ring, in the presence of alternating current, is turned
Alternating flux is produced on pilot trench tooth, utilizes the change of institute's induced potential size on opening transformer coil and supply voltage angle
Change to judge rotor windings turn-to-turn with the presence or absence of short circuit.This method may not apply to examining for rotary state lower rotor part turn-to-turn short circuit
Disconnected, need to shut down can just be carried out after extracting rotor out, performance difficulty.
(5) AC impedance and power attenuation method
When using rotor normal condition and shorted-turn fault be present, the change of rotor windings AC impedance and power attenuation
Change to realize the diagnosis of rotor inter-turn short circuit failure.This method have the advantages that it is easy, practical, can also be under static and dynamic
Measure, but the test result of AC impedence method is more by external condition influence factor, detection method has great limitation
Property.In addition to the tightness degree contacted by the material of rotor slot wedge and slot wedge with cell wall is influenceed, also by rotary state
Under stator added losses, rotor body remanent magnetism, experiment when apply the harmonic wave point of alive height, experiment power supply frequency, waveform
The influence of many factors such as amount, accurate conclusion can not be obtained during to judging slighter shorted-turn fault.
Several offline Short Circuit Between Generator Rotor Windings detection methods more than, born available for i.e. generator band online
The method of rotor turn-to-turn insulation condition detection is few when lotus runs, and mainly has following 2 kinds：
(1) exciting current amplification detection method
This method need not increase new equipment, by generator in same or like operating mode (active power and idle
Power) under exciting current change size analysis, realize the assessment to generator turn-to-turn insulation situation.Although this method implements letter
It is single, but accuracy deficiency, it is impossible to reflect that generator amature turn-to-turn whether there is short trouble.
(2) Current in Stator Winding Parallel Branches analytic approach
During generator normal operation, symmetrically, two parallel branch parameters per phase stator winding are also near for air-gap field
Patibhaga-nimitta etc., each branch road obtain the induced potential of same size, same-phase in corresponding harmonic field, circulation are not present between branch road.
But when rotor windings turn-to-turn has short trouble, the circulation of even-order harmonic between two branch roads that stator is often in parallel be present,
Its size is gradually increasing with the turn-to-turn short circuit order of severity.But current sensor need to be installed additional when actually using the method, system is more multiple
It is miscellaneous, and single Y shape winding generator can not be judged.
In summary, it is used for the online or offline inspection for detecting generator amature turn-to-turn insulation situation in power industry at present
Method is from the point of view of Cleaning Principle and practical application effect, in diagnostic sensitivity, diagnostic accuracy and diagnostic test enforcement difficulty
The shortcomings that different degrees of and deficiency be present, that is, there is no and can be achieved to carry out generator rotor interturn short-circuit situation standard in real time
The ways and means really detected.
Utility model content
To solve to carry out generator rotor interturn short-circuit situation the real-time technical problem accurately detected, this practicality is new
Type provides a kind of detection means of generator rotor interturn short-circuit situation, and it can be in generator load carrying or generator
During maintenance down, generator amature winding inter-turn can be detected with the presence or absence of short trouble.
Solution of the present utility model is：A kind of detection means of generator rotor interturn short-circuit situation, it is wrapped
Include and be periodically sent out the repetition pulse detection unit of the precipitous repetition pulse waveform signal of low pressure and forward position, be placed on generator
Search coil between stator and rotor, show with what the repetition pulse detection unit and the search coil were electrically connected
Ripple device；
When turn-to-turn short circuit occurs for generator amature winding, on the one hand, cause the repetition pulse waveform signal in failure
Reflection and refraction occur at point and is captured by the repetition pulse detection unit and thus exports the real-time waveform letter for producing change
Number, on the other hand, cause the air-gap flux between the stator of generator and rotor to be distorted and produce the real-time voltage of change
Signal；The oscillograph by receive real-time waveform signal display characterize rotor the two poles of the earth of generator generator amature around
Real-time characteristic response wave shape during turn-to-turn short circuit occurs for group, also characterizes generator by receiving the real-time voltage signal display
Real time voltage waveforms of the air-gap flux when turn-to-turn short circuit occurs for generator amature winding between stator and rotor, the oscillography
Device also display simultaneously be previously stored rotor the two poles of the earth of generator target signature response wave shape in normal operation and
The target voltage waveform of air-gap flux in normal operation between the stator and rotor of generator.
As the further improvement of such scheme, the detection means also includes the display being electrically connected with the oscillograph
Screen, the display screen show four waveforms of the oscilloscope display.
As the further improvement of such scheme, repetition pulse detection unit, search coil, oscillograph are integrated in outside one
In shell.
Further, three binding posts drawn from the repetition pulse detection unit are set on the shell, respectively
Generator switches through sub- positive pole slip ring, rotor negative pole slip ring, the big axle of rotor.
Further, set on the shell respectively from double-end two binding posts of the search coil.
Further, set what the repetition pulse detection unit and the search coil were powered respectively in the shell
Power supply, the power supply draw ground terminal and 220V ac power supply terminals from the shell.
Preferably, the power switch of the power supply is set on the shell.
Once more than oscilloscope display four waveforms, operating personnel's can are sentenced by the different wave shape in observation oscilloscope
Whether disconnected generator amature winding occurs turn-to-turn short circuit.Specifically, if it is observed that target signature response wave shape and real-time characteristic
Response wave shape substantially differs, or not overlapping, it is possible to which there occurs turn-to-turn short circuit for artificial judgement generator amature winding；If mesh
Mark voltage waveform and real time voltage waveforms substantially differ, or it is not overlapping can also artificially judge generator amature winding there occurs
Turn-to-turn short circuit., can also be by manually subtracting each other the maximum of wave amplitude in actual operation in order to simplify the workload of artificial judgment
It is worth and subtracts each other time shaft position corresponding to wave amplitude maximum come the fault message for rotor inter-turn short circuit of analyzing and researching.
Brief description of the drawings
Fig. 1 is the structural representation for the detection means that the utility model leads generator rotor interturn short-circuit situation.
Fig. 2 is the wiring schematic diagram of repetition pulse detection unit in Fig. 1.
Fig. 3 is the wiring schematic diagram of search coil in Fig. 1.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
Referring to Fig. 1, the detection means of generator rotor interturn short-circuit situation of the present utility model includes repeating arteries and veins
Rush detection unit 1, search coil 2, oscillograph 3.
Repetition pulse detection unit 1 is periodically sent out the precipitous repetition pulse waveform signal of low pressure and forward position, the repetition
When turn-to-turn short circuit occurs for generator amature winding 4 in fault point reflection and refraction occur for pulse waveform signal, and by described
Thus output signal characterizes the real-time characteristic response wave shape at the two poles of the earth of rotor 6 of generator after the capture of repetition pulse detection unit 1.Weight
The specific connected mode of recovering pulse detection unit 1 is as shown in Fig. 2 repetition pulse detection unit 1 has three connection terminals：End
Sub- A switches through sub- positive pole slip ring 9, and terminal B switches through sub- negative pole slip ring 10, and terminal C switches through sub big axle 11；When terminal C is periodically sent out
The precipitous repetition pulse waveform signal of low pressure and forward position, terminal A and terminal B are when turn-to-turn short circuit occurs for generator amature winding 4
Capture characterizes the signal of the real-time characteristic response wave shape at the two poles of the earth of rotor 6 of generator.
As shown in figure 3, search coil 2 is placed between the stator 5 of generator and rotor 6, the both ends of the search coil 2
When turn-to-turn short circuit occurs for generator amature winding 4, thus output signal characterizes the gas between the stator 5 and rotor 6 of generator
Thus gap magnetic flux Φ is distorted and produces the real time voltage waveforms of change.Search coil 2 has two binding posts：Respectively from
Both ends the leading-out terminal F and terminal G of coil.
When turn-to-turn short circuit occurs for generator amature winding 4, on the one hand, cause the repetition pulse waveform signal in failure
Occur to reflect at point with refraction and captured by the repetition pulse detection unit 1 and thus export the real-time waveform letter for producing change
Number, on the other hand, cause the air-gap flux between the stator 5 of generator and rotor 6 to be distorted and produce the real-time electricity of change
Press signal.
The oscillograph 3 characterizes the two poles of the earth of rotor 6 of generator in generator by receiving the real-time waveform signal display
Real-time characteristic response wave shape during turn-to-turn short circuit occurs for rotor windings 4, is also characterized by receiving the real-time voltage signal display
Real-time voltage ripple of the air-gap flux when turn-to-turn short circuit occurs for generator amature winding 4 between the stator 5 and rotor 6 of generator
Shape, the oscillograph 3 also show the target signature of the two poles of the earth of rotor 6 for the generator being previously stored in normal operation simultaneously
The target voltage ripple of air-gap flux in normal operation between response wave shape and the stator 5 and rotor 6 of generator
Shape.Target signature response wave shape, target voltage waveform not necessarily with characteristic response waveform, voltage waveform simultaneous display oscillograph again
In 3, it can also be shown in advance in oscillograph 3, or be shown in always in oscillograph 3.
That is, oscillograph 3 shows four waveforms, four waveforms include：The hair being previously stored in the oscillograph 3
The target signature response wave shape of rotor the two poles of the earth of motor in normal operation, the hair being previously stored in the oscillograph 3
The target voltage waveform of air-gap flux in normal operation between the stator 5 and rotor 6 of motor is described heavy by receiving
The output signal of recovering pulse detection unit 1 is simultaneously consequently formed the two poles of the earth of rotor 6 of generator in the generation turn-to-turn of generator amature winding 4
Real-time characteristic response wave shape when short-circuit, by receiving the output signal of the search coil 2 and being consequently formed determining for generator
Real time voltage waveforms of the air-gap flux when turn-to-turn short circuit occurs for generator amature winding 4 between son 5 and rotor 6.
Once more than the display of oscillograph 3 four waveforms, operating personnel's can pass through the different wave shape in observation oscilloscope
Judge whether generator amature winding occurs turn-to-turn short circuit.Specifically, if it is observed that target signature response wave shape and in real time spy
Sign response wave shape substantially differs, or not overlapping, it is possible to which there occurs turn-to-turn short circuit for artificial judgement generator amature winding；If
Target voltage waveform and real time voltage waveforms substantially differ, or it is not overlapping can also artificially judge generator amature winding occur
Turn-to-turn short circuit.Certainly, in the present embodiment, all it is to use manually to go to judge, manually goes to judge although the present embodiment uses, no
It is related to any software section, but in other embodiments, program can also be designed and realize intellectual judgement, realized intelligentized
Full-automatic detection function.
In addition, in order to simplify the workload of artificial judgment, can also be by manually subtracting each other wave amplitude in actual operation
Maximum and subtract each other time shaft position corresponding to wave amplitude maximum come the fault message for rotor inter-turn short circuit of analyzing and researching.
Meanwhile for four waveforms of display become apparent from, so that operating personnel preferably can manually compare, detection dress
The display screen being electrically connected with the oscillograph 3 can also be set by putting, and the display screen shows four that the oscillograph 3 is shown
Waveform.The screen of oscillograph 3 is smaller after all, and display screen can do big more directly perceived.
Status indicator lamp 7 can be set on the shell of repetition pulse detection unit 1 and on the shell of search coil 2, used
In the working condition for indicating respectively repetition pulse detection unit 1 and search coil 2.Whole detection means can integrate when making
Together, may also set up overall power supply to power to repetition pulse detection unit 1 and search coil 2 respectively, power supply draws earth terminal
Sub- D and 220V ac power supply terminals E.Whole detection means can also set the power switch 8 of the power supply.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (7)
- A kind of 1. detection means of generator rotor interturn short-circuit situation, it is characterised in that：It includes being periodically sent out low The repetition pulse detection unit of the precipitous repetition pulse waveform signal of pressure and forward position, it is placed between the stator of generator and rotor Search coil, the oscillograph that is electrically connected with the repetition pulse detection unit and the search coil；When turn-to-turn short circuit occurs for generator amature winding, on the one hand, cause the repetition pulse waveform signal in fault point Reflection occurs with refraction and is captured by the repetition pulse detection unit and thus exports the real-time waveform signal for producing change, separately On the one hand, the air-gap flux between the stator of generator and rotor is caused to be distorted and produce the real-time voltage signal of change； The oscillograph is sent out by receiving rotor the two poles of the earth that the real-time waveform signal display characterizes generator in generator amature winding Real-time characteristic response wave shape during raw turn-to-turn short circuit, the stator of generator is also characterized by receiving the real-time voltage signal display Real time voltage waveforms of the air-gap flux when turn-to-turn short circuit occurs for generator amature winding between rotor, the oscillograph is also The rotor the two poles of the earth for the generator being previously stored target signature response wave shape in normal operation is shown simultaneously and is generated electricity The target voltage waveform of air-gap flux in normal operation between the stator and rotor of machine.
- 2. the detection means of generator rotor interturn short-circuit situation as claimed in claim 1, it is characterised in that：The inspection The display screen that device also includes being electrically connected with the oscillograph is surveyed, the display screen shows four ripples of the oscilloscope display Shape.
- 3. the detection means of generator rotor interturn short-circuit situation as claimed in claim 1, it is characterised in that：Repeat arteries and veins Detection unit, search coil, oscillograph is rushed to be integrated in a shell.
- 4. the detection means of generator rotor interturn short-circuit situation as claimed in claim 3, it is characterised in that：It is described outer On shell set from the repetition pulse detection unit draw three binding posts, respectively generator switch through sub- positive pole slip ring, Rotor negative pole slip ring, the big axle of rotor.
- 5. the detection means of generator rotor interturn short-circuit situation as claimed in claim 3, it is characterised in that：It is described outer Set on shell respectively from double-end two binding posts of the search coil.
- 6. the detection means of generator rotor interturn short-circuit situation as claimed in claim 3, it is characterised in that：It is described outer The power supply powered respectively to the repetition pulse detection unit and the search coil is set in shell, and the power supply is from the shell Upper extraction ground terminal and 220V ac power supply terminals.
- 7. the detection means of generator rotor interturn short-circuit situation as claimed in claim 6, it is characterised in that：It is described outer The power switch of the power supply is set on shell.
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| CN108872856A (en) * | 2018-07-16 | 2018-11-23 | 山东固特电气有限公司 | Generator amature winding state detection device and method |
| CN108919040A (en) * | 2018-05-15 | 2018-11-30 | 国网河北省电力有限公司电力科学研究院 | Fault detection method, fault detection means and the electronic equipment of reactor winding |
| CN108957317A (en) * | 2018-06-06 | 2018-12-07 | 广东核电合营有限公司 | Detection method, device, computer and the storage medium of pressurized-water reactor nuclear power plant generating set bearing shell |
| CN110346685A (en) * | 2019-07-16 | 2019-10-18 | 杭州核诺瓦科技有限公司 | The device and method of large-size machine stator winding turn-to-turn state-detection |
| CN110470957A (en) * | 2019-08-16 | 2019-11-19 | 国网河北省电力有限公司电力科学研究院 | A kind of generator insulating fault comprehensive detection and diagnosis system |
| CN113433453A (en) * | 2021-05-20 | 2021-09-24 | 大唐信阳发电有限责任公司 | Generator rotor turn-to-turn short circuit diagnosis method based on RSO method |
| WO2021227837A1 (en) * | 2020-05-15 | 2021-11-18 | 杭州核诺瓦科技有限公司 | Device and method for nondestructive test of transient characteristics of conductive screw of rotor of turbo generator |
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| CN108919040A (en) * | 2018-05-15 | 2018-11-30 | 国网河北省电力有限公司电力科学研究院 | Fault detection method, fault detection means and the electronic equipment of reactor winding |
| CN108957317A (en) * | 2018-06-06 | 2018-12-07 | 广东核电合营有限公司 | Detection method, device, computer and the storage medium of pressurized-water reactor nuclear power plant generating set bearing shell |
| CN108957317B (en) * | 2018-06-06 | 2021-01-26 | 广东核电合营有限公司 | Method and device for detecting bearing bush of generator set of pressurized water reactor nuclear power station, computer and storage medium |
| CN108872856A (en) * | 2018-07-16 | 2018-11-23 | 山东固特电气有限公司 | Generator amature winding state detection device and method |
| CN113678007A (en) * | 2019-04-12 | 2021-11-19 | 三菱电机株式会社 | Short circuit detection device and short circuit detection method |
| CN113678007B (en) * | 2019-04-12 | 2024-06-04 | 三菱电机株式会社 | Short circuit detection device and short circuit detection method |
| CN110346685A (en) * | 2019-07-16 | 2019-10-18 | 杭州核诺瓦科技有限公司 | The device and method of large-size machine stator winding turn-to-turn state-detection |
| CN110470957A (en) * | 2019-08-16 | 2019-11-19 | 国网河北省电力有限公司电力科学研究院 | A kind of generator insulating fault comprehensive detection and diagnosis system |
| CN110470957B (en) * | 2019-08-16 | 2021-11-12 | 国网河北省电力有限公司电力科学研究院 | Generator insulation fault comprehensive detection and diagnosis system |
| WO2021227837A1 (en) * | 2020-05-15 | 2021-11-18 | 杭州核诺瓦科技有限公司 | Device and method for nondestructive test of transient characteristics of conductive screw of rotor of turbo generator |
| US11971452B2 (en) | 2020-05-15 | 2024-04-30 | Hangzhou Henuova Technology Co., Ltd. | Device and method for nondestructively detecting transient characteristic of conductive screw of turbo-generator rotor |
| CN113433453A (en) * | 2021-05-20 | 2021-09-24 | 大唐信阳发电有限责任公司 | Generator rotor turn-to-turn short circuit diagnosis method based on RSO method |
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