CN104155567A - Positioning method of turn-to-turn short circuit fault of doubly-fed generator rotor - Google Patents
Positioning method of turn-to-turn short circuit fault of doubly-fed generator rotor Download PDFInfo
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- CN104155567A CN104155567A CN201410435202.9A CN201410435202A CN104155567A CN 104155567 A CN104155567 A CN 104155567A CN 201410435202 A CN201410435202 A CN 201410435202A CN 104155567 A CN104155567 A CN 104155567A
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Abstract
The invention discloses a positioning method of a turn-to-turn short circuit fault of a doubly-fed generator rotor. The positioning method comprises the steps of arranging a detection coil and a photoelectric device, numbering slots of the generator rotor, determining the zero moment of the photoelectric device, collecting normal data, collecting fault data, positioning the fault and the like. By means of the positioning method, the turn-to-turn short circuit fault of the generator rotor can be accurately positioned without disassembling a generator. The positioning method is suitable for motors with small air gaps and wound rotors and has great significance in quickly removing the fault, maintaining efficient operation of a wind power plant and guaranteeing stable power supply of a power grid.
Description
Technical field
The present invention relates to technical field of generators, particularly a kind of method for double-fed type Short Circuit Between Generator Rotor Windings abort situation is positioned.
Background technology
Rotor interturn short-circuit fault is one of operating fault occurred frequently of double-feedback aerogenerator.After generator generation winding interturn short-circuit fault, can cause winding local overheating, unit vibration aggravation, if can not fix a breakdown in time, will cause major accident, threatens grid stability.
The method of monitoring double-feedback aerogenerator rotor interturn short-circuit fault has at present: 1) Spectral Analysis Method: when generator normally moves, stator side electric current and voltage frequency is fundamental frequency, rotor-side is excitation frequency, when occurring after rotor interturn short-circuit fault, there will be (1-2s) f(f in stator side is power frequency) inferior characteristic harmonics, rotor-side there will be characteristic harmonics 3sf time simultaneously.By monitor the characteristic frequency that whether occurs of generator stator and rotor electric current and voltage simultaneously, can judge whether generator rotor interturn short-circuit fault occurs, and can be according to the content failure judgement order of severity of above-mentioned characteristic frequency.2) Park vector method: the rotor current under three phase coordinate systems is transformed to static
under coordinate system.When motor normally moves, Park vector exists
under coordinate system, be a circular trace; In the time that motor winding breaks down, Park vector becomes an ellipse.Can judge according to oval shape the fault degree of turn-to-turn short circuit.3) negative sequence component method: if motor winding interturn short-circuit will destroy the Circuits System of three-phase symmetrical.The in the situation that of three phase supply balance, will in winding, produce negative-sequence current.Can judge according to the size of negative-sequence current the fault degree of turn-to-turn short circuit.
Above-mentioned three kinds of methods are all merely able to detect the generation of shorted-turn fault, but can not determine the particular location of generator generation shorted-turn fault.Find out the particular location that shorted-turn fault occurs as wanted, must split double-fed type generator, process is comparatively loaded down with trivial details.
Present stage, in technical field of generators, the detecting coil method of air-gap field is mainly used in the diagnosis of turn-to-turn short circuit of rotor winding of automobile turbine generator fault and the detection of location and Squirrel Cage Asynchronous Motors rotor bar breaking fault.The ultimate principle of air-gap field detecting coil method is: when generator operation, have the slot leakage flux of rotation in air gap, this swivelling chute leakage flux can produce induced potential in coil.After rotor interturn short-circuit fault occurs, the effective turn of fault winding reduces, and slot leakage flux reduces, and larger variation can occur the induced potential value when induced potential now producing in detecting coil is normal compared with winding.
Air-gap field coil probe method is in the time being applied to the operation of large-scale steamer synchronous generator, rotor of steam turbo generator winding passes into DC excitation electric current, the magnetic flux that rotor current produces is divided into two parts, a part be through air gap and with the main flux of stator winding intersecting chain, another part be not with the leakage flux of stator winding interlinkage.Because rotor winding distributes step by step along rotor circumference, so main flux is stepped in rotor surface distribution, pole surface place magnetic flux density maximum, weakens away from the magnetic flux density of pole surface.Therefore detecting coil is placed in air gap, can reflects by the induced potential in detecting coil the situation of change of air-gap field.To sum up, the design features such as turbodynamo distributed polar rotor structure, DC excitation and larger air gap, are conducive to realize the diagnosis of rotor interturn short-circuit fault and determining of abort situation by detecting coil method.
Air-gap field coil probe method is in the time being applied to cage type asynchronous motor, and the rotor slot of cage type asynchronous motor is open type or half opening formula, and each sliver is evenly distributed in the each groove of rotor and by end ring short circuit.In asynchronous machine operational process, in sliver, flow through low-frequency current, this electric current forms leakage flux at notch, if detecting coil is installed at motor gas-gap, rotating magnetic field can be on detecting coil induction electromotive force.Therefore, detecting coil can be applied to the fault diagnosis of Squirrel Cage Asynchronous Motors rotor broken bar, can failure judgement position by the voltage magnitude Changing Pattern of the inswept consecutive number groove of comparison detection coil.
But, because the structure of double-fed type inductor generator is special, do not possess air gap and the special rotor structure of squirrel cage induction motor that turbodynamo is larger, although rotor slot is uniformly distributed, but rotor winding is the same with stator winding, for three-phase symmetrical exchanges winding, and in rotor slot, winding passes into is AC excitation electric current, and in operational process, excitation frequency changes according to the variation of wind speed.Therefore, in view of structure and the operating characteristic of double-fed type inductor generator are all different from synchronous generator and squirrel cage induction motor, the method that is applied to the employing air-gap field coil probe method location rotor interturn short-circuit abort situation of synchronous generator and squirrel cage induction motor is not suitable for double-fed type generator.
Summary of the invention
The present invention is directed to the limitation of existing rotor interturn short-circuit Fault-Locating Test Fit Models, propose a kind of simple and feasible, accurate positioning and be applicable to double-fed type generator to carry out the method for rotor interturn short-circuit abort situation location.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
A localization method for double-fed type Short Circuit Between Generator Rotor Windings abort situation, comprises the following steps:
A. near the stator slot wedge surface of air gap, detecting coil is set at generator unit stator;
B. on the stator casing of generator outer shaft extending part, electrooptical device is set, and keep detecting coil, electrooptical device, generator rotor shaft three's geometric center in same plane M, its midplane M is vertical with fuselage base plane of living in and crosses the plane of above-mentioned three's geometric center simultaneously;
C. generator amature groove is numbered, and zero moment of definite electrooptical device;
D. gather the induced potential of same model non-fault generator detecting coil generation as the standard induced potential of detecting coil
;
E. gather the induced potential of fault generator detecting coil generation as fault induced potential
;
F. get the phase standard induced potential of detecting coil in the same time
with fault induced potential
it is poor to do, and draws induced potential difference curve
, foundation
the corresponding moment of maximum value
and generator amature rotating speed when signals collecting
can determine the rotor slot number that rotor interturn short-circuit fault occurs
.
The localization method of above-mentioned double-fed type Short Circuit Between Generator Rotor Windings abort situation, described steps A specifically comprises the following steps:
A1. get enamel covered wire identical with generator unit stator winding, that wire diameter is φ and make detecting coil;
A2. at generator unit stator slot wedge near air gap side apart from each 0.5mm place, slot wedge Width both sides, offer respectively along slot wedge length direction the semicircle open slot that diameter is φ, two effective edges of detecting coil are embedded respectively in open slot and fixing;
A3. draw outside generator through stator winding line outlet with shielding line the end of detecting coil.
The localization method of above-mentioned double-fed type Short Circuit Between Generator Rotor Windings abort situation, described detecting coil is arranged in generator on the slot wedge of the stator slot nearest with fuselage base plane vertical range of living in.
The localization method of above-mentioned double-fed type Short Circuit Between Generator Rotor Windings abort situation, described electrooptical device in rapid B comprises reflective photoelectric sensor and reflective paster step by step, for accurately measuring generator amature swing circle, the data that detect for detecting coil in each cycle provide time reference basic point.
The localization method of above-mentioned double-fed type Short Circuit Between Generator Rotor Windings abort situation, the concrete steps of step C are: step C is in the time being numbered generator amature groove, be numbered according to reversing sub-steering direction, setting certain rotor slot is No. 1 groove, in the time that the geometric center lines of No. 1 groove overlaps with the plane M described in step B, under the reflective photoelectric sensor of No. 1 groove geometric center lines, paste reflective paster in generator shaft extension part, and set zero moment point that this moment is electrooptical device.
The localization method of above-mentioned double-fed type Short Circuit Between Generator Rotor Windings abort situation, while gathering generator induced potential in described step D and step e, adopt prime mover that generator amature is dragged to a certain stabilized (steady-state) speed n, zero moment of setting taking electrooptical device is as starting point, gathers generator amature and rotates a circle induced potential that interior each moment detecting coil responds to respectively as standard induced potential
with fault induced potential
.
The localization method of above-mentioned double-fed type Short Circuit Between Generator Rotor Windings abort situation, described step F specifically comprises the following steps;
F1. calculate respectively the induced potential in each moment in non-fault generator and the time-count cycle of fault generator according to formula one
with
,
formula one
Wherein:
for by the magnetic flux of detecting coil,
for average flux density in detecting coil,
for detecting coil useful area,
for number of wire turns in detecting coil;
Calculate target data according to formula two, and draw induced potential difference curve
,
formula two
F2. the induced potential difference curve obtaining according to step F 1
two corresponding fault moments of very big difference while determining generator amature generation turn-to-turn fault
, finally determine according to formula six rotor slot number that rotor inter-turn short circuit fault occurs,
formula six
Wherein,
for fault moment,
for failure rotor groove number,
for rotor slot number, n is rotor speed.
The localization method of above-mentioned double-fed type Short Circuit Between Generator Rotor Windings abort situation, the collection of described induced potential gathers by data collecting instrument; In described data collecting instrument, be also provided with bandpass filter, the induced potential of data collecting instrument output is the power-frequency voltage signal in detecting coil.
Owing to having adopted above technical scheme, the invention technological progress is as follows.
The present invention is by improving existing detecting coil, makes it be more suitable for air gap very little and be the generator of phase-wound rotor, then gathers induced potential signal by detecting coil; Adopt electrooptical device that time reference is provided simultaneously, by corresponding one by one to the induced potential of detecting coil and reference time, obtain complete detection data; The difference of the induced potential after induced potential and rotor interturn short-circuit fault when the generator that then obtains by detecting coil is normal, and draw induced potential difference curve; While finally determining generator generation rotor interturn short-circuit according to induced potential difference curve, fault groove is through the moment of detecting coil below
, in conjunction with generator amature rotating speed
, complete rotor interturn short-circuit fault groove
accurate location.Employing the present invention can also be according to induced potential difference
the size of maximum value judges the order of severity of rotor interturn short-circuit fault, and extreme value is larger, and rotor interturn short-circuit fault is more serious.Application of the present invention can be in the situation that not splitting generator, abort situation to double-fed type Short Circuit Between Generator Rotor Windings is accurately located, be applicable to the motor type of small air gap, wound rotor, for rapidly removing faults, maintain wind energy turbine set and efficiently move, guarantee mains supply is stablized very important meaning.
Brief description of the drawings
Fig. 1 is electrical schematic diagram of the present invention;
Fig. 2 is the opening slot wedge schematic diagram that the present invention installs detecting coil;
Fig. 3 is opening slot wedge installation site schematic diagram;
Fig. 4 is the scheme of installation of electrooptical device of the present invention;
Fig. 5 is Short Circuit Between Generator Rotor Windings fault schematic diagram;
Fig. 6 is generator amature groove numbering and zero moment of electrooptical device rotor-position schematic diagram;
Fig. 7 is the standard induced potential of detecting coil when generator is normal in the present embodiment
curve map;
Fig. 8 is detecting coil induced potential when generator generation rotor inter-turn short circuit fault in the present embodiment
curve map;
Fig. 9 is generator generation shorted-turn fault front and back detecting coil induced potential difference in the present embodiment
curve map.
In figure, each label list is shown: 1. stator, 2. armature spindle, 3. electrooptical device, 31. reflective photoelectric sensors, 32. reflective pasters, 4. data collecting instrument, 5. connection terminal, 6. stator slot wedge, 7. open slot, 8. detecting coil.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The present invention specifically comprises the following steps:
A. detecting coil is arranged:
For the very little special construction of double-fed type power generator air gap, first detecting coil is arranged, to meet the demand of double-fed type electric generator structure.
A1. get enamel covered wire identical with generator unit stator winding, that wire diameter is φ and make detecting coil.
A2. at generator unit stator slot wedge 6 near air gap side apart from each 0.5mm place, slot wedge Width both sides, offer respectively along slot wedge length direction the semicircle open slot 7 that diameter is φ, two effective edges of detecting coil 8 are embedded respectively in open slot and fixed, as shown in Figure 2.This kind of design both ensured that detecting coil can not come off in the time of motor long-time running, made again detecting coil to greatest extent near rotor surface, disturbed away from stator side.
In the present embodiment, consider the faint impact of slotting on its physical strength at slot wedge, detecting coil is arranged in generator on the slot wedge of the stator slot nearest with fuselage base plane vertical range of living in, as shown in Figure 3.
A3. draw outside generator through stator winding line outlet with shielding line the end of detecting coil.
B., electrooptical device is set:
Electrooptical device 3 comprises that reflective photoelectric sensor 31 and the so-called reflective photoelectric sensor of reflective paster 32 refer to that emission phototube and receiving tube are at homonymy.Generator outer shaft extending part, with detecting coil in same geometric center lines, reflective photoelectric sensor is set vertically, this reflective photoelectric sensor is fixedly installed on generator unit stator shell, and paste reflective paster on rotor under reflective photoelectric sensor, as shown in Figure 4.Electrooptical device is used to detecting coil to detect data time reference is provided
, when rotor one week, enter reflective photoelectric sensor once through the light of reflective paster reflection, reflective photoelectric sensor transmitting pulsatile once signal, the time interval between two pulse signals is the rotor cycle.Electrooptical device must keep the geometric center of detecting coil, reflective photoelectric sensor signal receiving end, reflective paster, generator rotor shaft in same plane M, as shown in Figure 1 in installation process.
C. generator amature groove is numbered, and zero moment of definite electrooptical device:
When generator amature groove is numbered, be numbered according to reversing sub-steering direction.Setting certain rotor slot is No. 1 groove, when the geometric center lines of No. 1 groove overlap with the plane M described in step B and reflective paster be positioned at reflective photoelectric sensor under time, setting this moment is zero moment point of electrooptical device.
Taking laboratory double-fed type generator YR132M-4 as example, while normally operation, rotor is rotated counterclockwise, thus when being numbered, rotor slot is numbered according to clockwise direction, as shown in Figure 6.
The basic parameter of double-fed generator YR132M-4 is as shown in table 1:
Table 1
D. the collection of normal data:
The induced potential being produced by detecting coil in collection same model non-fault generator (just dispatched from the factory through the motor of verification experimental verification with generator, or be defined as healthy motor through operation) is as the standard induced potential of detecting coil
.
While gathering non-fault generator induced potential, adopt prime mover that generator amature is dragged to a certain stabilized (steady-state) speed n, the revolutional slip of the present embodiment rotor operation is s=0.2.Zero moment of setting taking electrooptical device is as starting point, gathers generator amature and rotates a circle induced potential that interior each moment detecting coil responds to as standard induced potential
.For ensureing data accuracy, need to gather multi-group data backup.
In the time that generator amature rotates, rotor slot leakage flux is together rotated with rotor, and cuts detecting coil generation induced potential, and its big or small employing formula one is calculated:
formula one
Wherein:
for by the magnetic flux of detecting coil,
for average flux density in detecting coil,
for detecting coil useful area,
for number of wire turns in detecting coil.
Continuity above-described embodiment, right
the data that generator in Shi Renyi complete cycle runs well gather, and obtain the standard induced potential when normal
, as shown in Figure 7.
E. the collection of fault data:
Gather the induced potential that fault generator is produced by detecting coil, and be recorded as fault induced potential
.
While gathering fault generator induced potential, adopt prime mover that the generator amature that rotor inter-turn short circuit fault occurs is dragged to stabilized (steady-state) speed n identical when gathering normal data in step D, zero moment of setting taking electrooptical device is as starting point, gather the numerical value of one week interior each moment detecting coil induced potential of fault generator rotor, as fault induced potential
.For ensureing data accuracy, need to gather multi-group data backup.
Continuity above-described embodiment, right
service data when generator amature generation shorted-turn fault in Shi Renyi complete cycle gathers, and obtains fault induced potential
, as shown in Figure 8.
In step D and step e, the collection of induced potential gathers by data collecting instrument.Consider that the induced potential being produced by rotor slot leakage flux in detecting coil is very little, and after generator generation rotor inter-turn short circuit fault, there will be a series of high-frequency harmonics, therefore bandpass filter is set in data collecting instrument, signal in detecting coil is carried out to noise reduction process, and making the induced potential of data collecting instrument output is the power-frequency voltage signal in detecting coil.
F. localization of fault:
Get the phase standard induced potential of detecting coil in the same time
with fault induced potential
it is poor to do, and draws induced potential difference curve
, according to being somebody's turn to do
the corresponding moment of maximum value
and generator amature rotating speed when signals collecting
can determine the rotor slot number that rotor interturn short-circuit fault occurs
.
When rotor winding is normal, each rotor slot winding effective turn is equal, and rotor slot leakage flux rate of change equates; But when after rotor winding generation turn-to-turn short circuit, the rotor slot effective turn of fault reduces, as shown in Figure 5.Now rotor slot leakage flux rate of change also diminishes, and the induced potential amplitude producing in detecting coil also reduces.Comparison when normal with winding, the induced potential amplitude that failure rotor groove produces in the time of inswept detecting coil in detecting coil will obviously reduce, and calculate target data according to formula two:
formula two
Continuity above-described embodiment, taking the difference of induced potential in detecting coil after rotor interturn short-circuit fault as ordinate, time complete cycle gathering with electrooptical device
for horizontal ordinate is drawn induced potential difference curve
, as shown in Figure 9.
When rotor winding occurs after shorted-turn fault, have effective turn significant change in two rotor slot, so after fault, through type two calculates
have two values and be obviously greater than other value.According to these two maximum value in target data, can determine the moment corresponding in this cycle
, hereinafter
,
represent respectively above-mentioned two moment that maximum value is corresponding,
,
represent respectively by
,
definite failure rotor groove number.
In Fig. 9, there is obviously distortion in arrow indication position, is two maximum points of detecting coil induced potential difference, and the moment that can obtain failure rotor groove correspondence under detecting coil according to Fig. 9 is
,
.
Consider magnetic close variation not as mechanical fault position accurate, be as the criterion with rotor notch geometric center moment under detecting coil, time error exists
inside all belong to this groove fault.Failure rotor groove number
and fault moment
must meet formula three inequality:
formula three
In formula three
for the mistiming of the inswept detecting coil of adjacent two rotor slot geometric center, calculate according to formula four:
formula four
Wherein: n is rotor speed, Z is rotor slot number.
Bringing formula three into formula four can obtain:
formula five
Separate inequality five, can obtain:
formula six
Failure rotor groove number in formula six
get positive integer, can determine the rotor slot number of generator amature generation shorted-turn fault.
In the present embodiment, generator amature is rotated counterclockwise, and when 0 moment No. 1 groove under detecting coil,
the failure rotor groove number that moment is corresponding
meet inequality six, will
bringing formula six into can obtain:
Solve,
.
In like manner,
the failure rotor groove number that moment is corresponding
meet inequality six, will
bringing formula six into can obtain:
Solve
.
The generator of the present embodiment is split, can find that the failure rotor groove number that adopts localization method of the present invention to obtain conforms to the rotor slot number of physical fault.
Respectively for revolutional slip
,
in situation, get arbitrarily many groups not data in the same time carry out check analysis, result of calculation all conforms to physical fault rotor slot number, shows that fault groove localization method of the present invention is accurate, reliably.
Claims (8)
1. a localization method for double-fed type Short Circuit Between Generator Rotor Windings abort situation, is characterized in that, it comprises the following steps:
A. near the stator slot wedge surface of air gap, detecting coil is set at generator unit stator;
B. on the stator casing of generator outer shaft extending part, electrooptical device is set, and keeping detecting coil, electrooptical device, generator rotor shaft three's geometric center in same plane M, its midplane M is vertical with fuselage base plane of living in and crosses the plane of above-mentioned three's geometric center simultaneously;
C. generator amature groove is numbered, and zero moment of definite electrooptical device;
D. gather the induced potential of same model non-fault generator detecting coil generation as the standard induced potential of detecting coil
;
E. gather the induced potential of fault generator detecting coil generation as fault induced potential
;
F. get the phase standard induced potential of detecting coil in the same time
with fault induced potential
it is poor to do, and draws induced potential difference curve
, foundation
the corresponding moment of maximum value
and generator amature rotating speed when signals collecting
can determine the rotor slot number that rotor interturn short-circuit fault occurs
.
2. according to the localization method of a kind of double-fed type Short Circuit Between Generator Rotor Windings abort situation described in claim, it is characterized in that: the concrete operations of described steps A are:
A1. get enamel covered wire identical with generator unit stator winding, that wire diameter is φ and make detecting coil;
A2. at generator unit stator slot wedge near air gap side apart from each 0.5mm place, slot wedge Width both sides, offer respectively along slot wedge length direction the semicircle open slot that diameter is φ, two effective edges of detecting coil are embedded respectively in open slot and fixing;
A3. draw outside generator through stator winding line outlet with shielding line the end of detecting coil.
3. the localization method of a kind of double-fed type Short Circuit Between Generator Rotor Windings abort situation according to claim 2, is characterized in that: described detecting coil is arranged on the slot wedge of the nearest stator slot of generator vertical range interior and fuselage base plane of living in.
4. the localization method of a kind of double-fed type Short Circuit Between Generator Rotor Windings abort situation according to claim 3, it is characterized in that: the described electrooptical device in step B comprises reflective photoelectric sensor and reflective paster, for accurately measuring generator amature swing circle, the data that detect for detecting coil in each cycle provide time reference basic point.
5. the localization method of a kind of double-fed type Short Circuit Between Generator Rotor Windings abort situation according to claim 4, is characterized in that: described step C, in the time that generator amature groove is numbered, is numbered according to reversing sub-steering direction; Setting certain rotor slot is No. 1 groove, in the time that the geometric center lines of No. 1 groove overlaps with the plane M described in step B, under the reflective photoelectric sensor of No. 1 groove geometric center lines, paste reflective paster in generator shaft extension part, and set zero moment point that this moment is electrooptical device.
6. the localization method of a kind of double-fed type Short Circuit Between Generator Rotor Windings abort situation according to claim 5, it is characterized in that: in described step D and step e in the time gathering generator induced potential, adopt prime mover that generator amature is dragged to a certain stabilized (steady-state) speed n, zero moment of setting taking electrooptical device is as starting point, gather the generator amature induced potential that interior each moment detecting coil responds to that rotates a circle, respectively as standard induced potential
with fault induced potential
.
7. the localization method of a kind of double-fed type Short Circuit Between Generator Rotor Windings abort situation according to claim 6, is characterized in that: described step F is undertaken by following operation;
F1. calculate respectively the induced potential in each moment in non-fault generator and the time-count cycle of fault generator according to formula one
with
,
formula one
Wherein:
for by the magnetic flux of detecting coil,
for average flux density in detecting coil,
for detecting coil useful area,
for number of wire turns in detecting coil;
Calculate target data according to formula two, and draw induced potential difference curve
,
formula two
F2. the induced potential difference curve obtaining according to step F 1
two corresponding fault moments of very big difference while determining generator amature generation turn-to-turn fault
, finally determine according to formula six rotor slot number that rotor inter-turn short circuit fault occurs,
formula six
Wherein,
for fault moment,
for failure rotor groove number,
for rotor slot number, n is rotor speed.
8. according to the localization method of a kind of double-fed type Short Circuit Between Generator Rotor Windings abort situation described in claim 1 to 7 any one, it is characterized in that: the collection of described induced potential gathers by data collecting instrument; In described data collecting instrument, be also provided with bandpass filter, the induced potential of data collecting instrument output is the power-frequency voltage signal in detecting coil.
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|---|---|---|---|
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| CN2185899Y (en) * | 1993-08-12 | 1994-12-21 | 湖北省电力试验研究所 | Generator rotor winding dynamic short-circuit in line testing device |
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| CN201535810U (en) * | 2009-07-17 | 2010-07-28 | 哈尔滨亚源电力有限责任公司 | On-line detection device for interturn short circuit in rotor windings of generator |
| CN102355090B (en) * | 2011-10-20 | 2013-02-27 | 清华大学 | Exploring coil arrangement method simultaneously reflecting electric generator stator and rotor internal short circuits |
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| CN113391235A (en) * | 2021-06-04 | 2021-09-14 | 华北电力大学（保定） | System and method for detecting dynamic turn-to-turn short circuit fault of synchronous generator rotor |
| CN113391235B (en) * | 2021-06-04 | 2022-07-19 | 华北电力大学（保定） | System and method for detecting dynamic turn-to-turn short circuit fault of synchronous generator rotor |
| CN113945848A (en) * | 2021-10-15 | 2022-01-18 | 哈尔滨电机厂有限责任公司 | Method for determining flashover discharge path of generator stator winding |
| CN113945848B (en) * | 2021-10-15 | 2023-12-22 | 哈尔滨电机厂有限责任公司 | Method for determining flashover discharge path of generator stator winding |
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