CN110441688A - Hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection method - Google Patents
Hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection method Download PDFInfo
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- CN110441688A CN110441688A CN201910774477.8A CN201910774477A CN110441688A CN 110441688 A CN110441688 A CN 110441688A CN 201910774477 A CN201910774477 A CN 201910774477A CN 110441688 A CN110441688 A CN 110441688A
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- turn
- winding
- rotor
- stator core
- short circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
Abstract
Hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection method.Traditional detection method is that the AC impedance of the measurement rotor magnetic pole in rotor static state can not then detect data exception to judge failure magnetic pole number, but this method shorted-turn fault dynamic for rotor magnetic pole.Its composition of the invention includes: iron core bracket (5), partition (6), big axis (9), key phase block (10) and key phase (11), one group of screw rod (1) is fixed on iron core bracket, stator core (4) are fixed on screw rod, 3 sections are divided by the partition from bottom to up on stator core, circle detection winding (3) is wound on the silicon steel sheet ventilation hole of the stator core in each section, it connects between two adjacent rings detection winding, every circle detection winding bypasses the silicon steel sheet (2) of multi-layer stator iron core.The present invention is used for the detection of hydraulic generator rotor winding dynamic shorted-turn fault.
Description
Technical field:
The present invention relates to a kind of hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection methods.
Background technique:
When shorted-turn fault occurs for magnet pole of rotor of hydraulic generator, traditional detection method is in static (the i.e. static shape of rotor
State) when measure the AC impedance of rotor magnetic pole, to judge failure magnetic pole number, but this method is only applicable to hydrogenerator and turns
The turn-to-turn short circuit situation of sub- magnetic pole static state, turn-to-turn short circuit dynamic for rotor magnetic pole can not then detect data exception.
Summary of the invention:
Present invention aim to address the turn-to-turn short circuits that current detection method is only applicable to magnet pole of rotor of hydraulic generator static state
Situation, turn-to-turn short circuit dynamic for rotor magnetic pole, then the problem of can not detecting data exception, providing one kind can accurately sentence
Determine the hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection method of failure magnetic pole number.
Above-mentioned purpose is realized by following technical scheme:
A kind of hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device, composition include: iron core bracket, partition, big axis,
Key phase block and key phase are fixed with one group of screw rod on the iron core bracket, are fixed with stator core on the screw rod,
On the stator core 3 sections are divided by the partition from bottom to up, the stator core in each section
It is wound with circle detection winding on silicon steel sheet ventilation hole, connects between detection winding described in two adjacent rings, spy described in every circle
Winding is surveyed around the silicon steel sheet of stator core described in multilayer.
The hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device, detection winding described in every circle bypass 4-
The silicon steel sheet of stator core described in 5 layers.
A kind of detection method of hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device, this method include following step
It is rapid:
(1) search coil is installed in stator core ventilation hole, search coil uses single insulated flexible cord, and search coil is installed respectively
In 3 section series wirings, the number of plies of the stator iron core silicon steel sheet surrounded is 4 layers；The iron core number of plies that search coil surrounds is got over
More, then the amplitude of induced potential is bigger；Search coil should form the winding of closure；Search coil and rotor surface should keep away from
From；
(2) basin end that oils is led in unit water wheel chamber water and cover installation key phase, and viscous in the corresponding position of the big axis of unit
Key phase block is pasted, the installation position of key phase block answers the pole center of face rotor；
(3) signal of search coil and key phase being connected to electricity waveform recording and analyzing instrument, unit is switched on to idle running, from
0 starts to step up rotor windings exciting current, and the exciting current of application is not greater than the rated no-load excitation electricity of rotor windings
Stream, and boost in batches using 10% voltage rating as gradient, each voltage gradient stops 5-10 minutes, stablizes to Wave data
Recording records afterwards.The induced potential that winding is detected when by electricity waveform recording and analyzing instrument to each gradient carries out waveform recording point
Analysis compares according to the characteristic wave peak amplitude size of waveform, judges whether there is some wave crest amplitude obviously than other wave crest amplitudes
Less than normal, if there is the obvious wave crest less than normal of amplitude, then illustrating to generate the magnetic pole of the wave crest, there are Inter-turn Short Circuit Phenomenons, to lead
Electromagnetic force at this is caused to reduce.It after determining amplitude wave crest less than normal, i.e., is positioned using key signal, to accurately determine to turn
There are shorted-turn faults for which sub magnetic pole.
The utility model has the advantages that
1. being divided into 3 sections by partition from bottom to up on stator core of the present invention, twined on the silicon steel sheet ventilation hole in each section
It is wound with circle detection winding, is connected between detection winding described in two adjacent rings, detection winding described in every circle bypasses 4-5 layers of institute
The silicon steel sheet for the stator core stated, it is possible to increase the amplitude of induced potential, while also can guarantee the accuracy of testing result.
The present invention use dynamic instrumentation winding waveform method, on turbine-generator units stator core innovatively installation detection around
Group applies exciting current appropriate when rotor is rotated with rated speed on rotor windings, and each magnetic pole can detect herein
Induced electromotive force is generated on winding, the amplitude of the induced electromotive force is directly proportional to corresponding magnetic pole effective turn, feels by analysis
EMF waveform amplitude size and distortion situation are answered, is positioned according to key signal, to accurately determine failure magnetic pole number.
The rapidity and accuracy of trouble shoot can be improved in detection method of the invention, can be in shortest time internal lock
Determine failure magnetic pole, to formulate the quick handling failure of maintenance solution, reduces electric quantity loss to greatest extent.
Key phase block of the present invention answers some magnetic pole of face rotor, and it is fixed to can be convenient the progress failure magnetic pole in waveform analysis
Position.
Detailed description of the invention:
Attached drawing 1 is structural schematic diagram of the invention；
Attached drawing 2 is dynamic instrumentation winding waveform method schematic diagram；
Attached drawing 3 is search coil Waveform Method waveform diagram；
In figure: 1, screw rod；2, silicon steel sheet；3, winding is detected；4, stator core；5, iron core bracket；6, partition；7, connecting wire；
8, rotor；9, big axis；10, key phase block；11, key phase.
Specific embodiment:
Embodiment 1:
A kind of hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device, composition includes: iron core bracket 5, partition 6, big
Axis 9, key phase block 10 and key phase 11 are fixed with one group of screw rod 1 on the iron core bracket, are fixed on the screw rod
Stator core 4 is divided into 3 sections by the partition from bottom to up on the stator core, in the described of each section
It is wound with circle detection winding 3 on the silicon steel sheet ventilation hole of stator core, connects between detection winding described in two adjacent rings, often
The circle detection winding bypasses the silicon steel sheet 2 of stator core described in multilayer.
Embodiment 2:
According to hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device described in embodiment 1, detection described in every circle around
It organizes around the silicon steel sheet of stator core described in 4-5 layers.
Embodiment 3:
A kind of detection method of hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device, this method comprises the following steps:
1) search coil is installed in stator core ventilation hole, search coil uses single insulated flexible cord, and search coil is installed respectively
In 3 section series wirings, the number of plies of the stator iron core silicon steel sheet surrounded is 4 layers；The iron core number of plies that search coil surrounds is got over
More, then the amplitude of induced potential is bigger；Search coil should form the winding of closure；Search coil and rotor surface should keep away from
From；
(2) basin end that oils is led in unit water wheel chamber water and cover installation key phase, and viscous in the corresponding position of the big axis of unit
Key phase block is pasted, the installation position of key phase block answers the pole center of face rotor；
(3) signal of search coil and key phase being connected to electricity waveform recording and analyzing instrument, unit is switched on to idle running, from
0 starts to step up rotor windings exciting current, and the exciting current of application is not greater than the rated no-load excitation electricity of rotor windings
Stream, and boost in batches using 10% voltage rating as gradient, each voltage gradient stops 5-10 minutes, stablizes to Wave data
Recording records afterwards.The induced potential that winding is detected when by electricity waveform recording and analyzing instrument to each gradient carries out waveform recording point
Analysis compares according to the characteristic wave peak amplitude size of waveform, judges whether there is some wave crest amplitude obviously than other wave crest amplitudes
Less than normal, if there is the obvious wave crest less than normal of amplitude, then illustrating to generate the magnetic pole of the wave crest, there are Inter-turn Short Circuit Phenomenons, to lead
Electromagnetic force at this is caused to reduce.It after determining amplitude wave crest less than normal, i.e., is positioned using key signal, to accurately determine to turn
There are shorted-turn faults for which sub magnetic pole.
Dynamic instrumentation winding waveform method test result waveform diagram is shown in Fig. 3, and analysis waveform is as it can be seen that each cycle (10 magnetic
Pole is alternately produced 10 wave crests) there are the more other 9 wave crest amplitudes of 1 wave crest amplitude obviously less than normal in the period, amplitude phase
Poor 14% or so.It in conjunction with the positional relationship of search coil, key phase block and key phase, is positioned using key signal, confirmation causes
Induced potential amplitude exactly No. 6 magnetic poles less than normal.
After confirming No. 6 magnetic pole failures, Rush Repair Scheme is worked out immediately, under the premise of not hanging out rotor, completes 6 in machine is cheated
Number magnetic pole is removed and new magnetic pole mounts equal system repairing work, is then switched on to rated speed progress stepping up from zero test, is added
It is depressed into 100% voltage rating, unit vibration throw value is all satisfied code requirement.
Turbine-generator units are during operation, it is possible to will appear rotor magnetic pole shorted-turn fault, work as generator excitation
When electric current or vibration amplitude significantly increase and reason is unknown, the diagnosis of Ying Jinhang rotor interturn short-circuit failure.Rotor windings
Static turn-to-turn short circuit is easier to detect, can be true using the symmetry of rotor magnetic pole by static ac impedance measurement
Which fixed magnetic pole there are turn-to-turn short circuit, and the dynamic turn-to-turn short circuit of rotor magnetic pole be it is unstable, it with the revolving speed of rotor and
Variation, when shutting down progress static state electrical test, every test result is again all normal, larger difficulty is brought to trouble shoot,
Trouble shoot work can be even set to have reached an impasse.It, can be with using dynamic communication testing impedance method and dynamic instrumentation winding waveform method
The rapidity and accuracy for improving trouble shoot, can lock failure magnetic pole, to formulate maintenance solution within the shortest time
Quick handling failure, reduces electric quantity loss to greatest extent.
Claims (3)
1. a kind of hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device, composition includes: iron core bracket, partition, big
Axis, key phase block and key phase, it is characterized in that: one group of screw rod is fixed on the iron core bracket, it is solid on the screw rod
Surely there is stator core, 3 sections are divided by the partition from bottom to up on the stator core, described in each section
Stator core silicon steel sheet ventilation hole on be wound with circle detection winding, connect between detection winding described in two adjacent rings,
Detection winding described in every circle bypasses the silicon steel sheet of stator core described in multilayer.
2. hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device according to claim 1, it is characterized in that: every circle
Described detects winding around the silicon steel sheet of stator core described in 4-5 layers.
3. a kind of detection method of hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device claimed in claims 1-2,
It is characterized in that: this method comprises the following steps:
(1) search coil is installed in stator core ventilation hole, search coil uses single insulated flexible cord, and search coil is installed respectively
In 3 section series wirings, the number of plies of the stator iron core silicon steel sheet surrounded is 4 layers；The iron core number of plies that search coil surrounds is got over
More, then the amplitude of induced potential is bigger；Search coil should form the winding of closure；Search coil and rotor surface should keep away from
From；
(2) basin end that oils is led in unit water wheel chamber water and cover installation key phase, and viscous in the corresponding position of the big axis of unit
Key phase block is pasted, the installation position of key phase block answers the pole center of face rotor；
(3) signal of search coil and key phase being connected to electricity waveform recording and analyzing instrument, unit is switched on to idle running, from
0 starts to step up rotor windings exciting current, and the exciting current of application is not greater than the rated no-load excitation electricity of rotor windings
Stream, and boost in batches using 10% voltage rating as gradient, each voltage gradient stops 5-10 minutes, stablizes to Wave data
Recording records afterwards.The induced potential that winding is detected when by electricity waveform recording and analyzing instrument to each gradient carries out waveform recording point
Analysis compares according to the characteristic wave peak amplitude size of waveform, judges whether there is some wave crest amplitude obviously than other wave crest amplitudes
Less than normal, if there is the obvious wave crest less than normal of amplitude, then illustrating to generate the magnetic pole of the wave crest, there are Inter-turn Short Circuit Phenomenons, to lead
Electromagnetic force at this is caused to reduce.It after determining amplitude wave crest less than normal, i.e., is positioned using key signal, to accurately determine to turn
There are shorted-turn faults for which sub magnetic pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774477.8A CN110441688A (en) | 2019-08-21 | 2019-08-21 | Hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774477.8A CN110441688A (en) | 2019-08-21 | 2019-08-21 | Hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection method |
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| CN110441688A true CN110441688A (en) | 2019-11-12 |
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| CN201910774477.8A Pending CN110441688A (en) | 2019-08-21 | 2019-08-21 | Hydraulic generator rotor winding dynamic turn-to-turn short circuit detection device and detection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579991A (en) * | 2020-06-30 | 2020-08-25 | 广东通德电力工程有限公司 | Positioning device for turn-to-turn short circuit fault of generator rotor and using method |
| CN111679192A (en) * | 2020-08-03 | 2020-09-18 | 国家电网有限公司 | Pumped storage generator motor rotor fault off-line detection device |
| CN114200303A (en) * | 2021-11-02 | 2022-03-18 | 华中科技大学 | Fault detection system based on detection coil group |
-
2019
- 2019-08-21 CN CN201910774477.8A patent/CN110441688A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579991A (en) * | 2020-06-30 | 2020-08-25 | 广东通德电力工程有限公司 | Positioning device for turn-to-turn short circuit fault of generator rotor and using method |
| CN111679192A (en) * | 2020-08-03 | 2020-09-18 | 国家电网有限公司 | Pumped storage generator motor rotor fault off-line detection device |
| CN114200303A (en) * | 2021-11-02 | 2022-03-18 | 华中科技大学 | Fault detection system based on detection coil group |
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