CN106501665A - Hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil - Google Patents
Hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil Download PDFInfo
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
The invention discloses a kind of hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil, it is included in the U-shaped detection coil that generator installs radial direction across stator core segment, the output port parallel connection high resistance measurement of U-shaped detection coil, using online data collection and the voltage signal of real-time analyzer processing detection coil output；In generator operation, the voltage signal exported using on-line acquisition system Real-time Collection U-shaped detection coil, and real-time data processing is carried out to the voltage signal for collecting, during U-shaped detection coil that the same position of relatively different magnetic poles is inswept in detection coil induced voltage deviation, when voltage difference exceeds given threshold, judge that the hydrogenerator has rotor interturn short-circuit failure.The present invention can improve the deficiencies in the prior art, improve the diagnostic level of such failure.
Description
Technical field
The present invention relates to technical field of generators, especially a kind of hydraulic generator rotor winding turns based on detection coil
Between short-circuit diagnostic method.
Background technology
In recent years, many hydrogenerators there occurs rotor interturn short-circuit failure, and reported turn-to-turn together is short
Road failure even causes the action of hydrogenerator transverse differential protection, therefore, the rotor interturn short-circuit event of hydrogenerator
Barrier should cause enough attention.
The rotor windings of hydrogenerator are for centralized, completely different with the distributed winding of steam turbine generator.Once water
There is shorted-turn fault in turbine generator, and the magnetic field of failure pole is weakened, and the magnetic field of two magnetic poles extremely adjacent with failure also can
It is affected by weakened, causes the unilateral magnetic force of whole generator failure side to decline, rotor is made by unbalanced magnetic pull
The high vibration of hydrogenerator may be caused with, serious turn-to-turn short circuit, this phenomenon some hydraulic generators at home
Occur in that on machine.
In recent years, commonly used hydraulic generator rotor winding interturn short-circuit diagnostic method also in offline horizontal, often
Use D.C. resistance relative method, AC impedance and power attenuation method, alternating current-direct current branch pressure voltage method etc..These methods are required for
Tested on each magnetic pole of rotor windings, by contrasting D.C. resistance, AC impedance and power attenuation of each magnetic pole etc.
Data judge hydrogenerator with the presence or absence of rotor interturn short-circuit failure, and diagnostic method falls behind, and process is time-consuming longer, causes
The unit outage time is long, wastes water resource.It is therefore proposed that the hydraulic generator rotor winding with high sensitivity and reliability
Turn-to-turn short circuit inline diagnosis method is very urgent.
In terms of the rotor interturn short-circuit fault diagnosis of steam turbine generator, have already been proposed some on-line checkings
Method, but these methods are not particularly suited for hydrogenerator, this is because：Hydrogenerator is up to tens of to pole, and rotating speed is low, empty
Between size big, the branch of stator winding is more.The rotor windings of a certain magnetic pole occur shorted-turn fault only affects the phase of local
Powered-down tolerance, the impact to whole electromotor are relatively small, therefore, traditional exciting current method, fictitious power method, desired potential
Method, shaft voltage method and brow leakage etc. are difficult the rotor interturn short-circuit failure for delicately detecting hydrogenerator.Water wheels
The rotor of electromotor is salient-pole structure, and winding is centralized, and the conventional detection coil method that steam turbine generator is most frequently with is also uncomfortable
For hydrogenerator, because the real work part of conventional detection coil is its probe, probe size is less, from stator ferrum
Gap is reached near rotor in the heart, detects the leakage magnetic flux at each teeth groove mouth of rotor, and the pole dimension of hydrogenerator is big, without picture
, just there is no slot leakage flux in the same tooth slot structure of steam turbine generator, therefore, conventional detection coil is not particularly suited for water wheels and sends out yet
The detection of motor rotor winding interturn short-circuit.Also after having part document analysis hydraulic generator rotor winding interturn short-circuit failure
Stator current and exciting current harmonic characteristic, it is believed that rotor interturn short-circuit failure can be diagnosed by features described above,
The shortcoming of the method is without fault location function, yet there are no and is applied on hydrogenerator.In addition some documents
The stator parallel branch circulation problem that rotor interturn short-circuit causes is paid close attention to, some hydrogenerators are in stator parallel branch
On be mounted with current transformer, but be only used at present providing data to transverse differential protection, have no which is applied to rotor windings turn-to-turn short
The inline diagnosis of road failure.
In a word, although attaching great importance to the rotor interturn short-circuit fault diagnosis of hydrogenerator at present, practical and
The online test method of excellent performance is seriously deficient, therefore, it is necessary to further improve the diagnostic level of such failure, exploitation is new
Hydraulic generator rotor winding interturn short-circuit online test method.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of hydraulic generator rotor winding inter-turn based on detection coil
Short-circuit diagnostic method, can solve the problem that the deficiencies in the prior art, improve the diagnostic level of such failure.
For solving above-mentioned technical problem, the technical solution used in the present invention is as follows.
A kind of hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil, it is characterised in that include with
Lower step：
A, the U-shaped detection coil for installing radial direction in generator across stator core segment, the outfan of U-shaped detection coil
Mouth high resistance measurement in parallel, using online data collection and the voltage signal of real-time analyzer processing detection coil output；
B, in generator operation, using on-line acquisition system Real-time Collection U-shaped detection coil export voltage letter
Number, and real-time data processing is carried out to the voltage signal for collecting, compare the inswept U-shaped detection line of same position of different magnetic poles
During circle in detection coil induced voltage deviation, when voltage difference exceeds given threshold, judge that the hydrogenerator is present and turn
Sub- winding interturn short-circuit failure.
Preferably, during the inswept U-shaped detection coil of the same position of different magnetic poles in detection coil induced voltage inclined
Difference is directly proportional to rotor interturn short-circuit fault degree.
Preferably, using different magnetic poles same position inswept U-shaped detection coil when in detection coil induced voltage
Deviation as failure criterion.
Preferably, the real-time magnitude of voltage of collection is compared with the historical data of the integral multiple for being separated by 0.02S, partially
Difference is：
A=v (t)-v (t-k × 0.02)
Can determine that hydrogenerator has rotor interturn short-circuit failure when a exceedes given threshold；
Wherein, v is magnitude of voltage, and t is acquisition time, and k is positive integer.
Preferably, failure determination threshold is set as 0.15V.
It is using the beneficial effect brought by above-mentioned technical proposal：The diagnostic method of the present invention can be realized sending out water wheels
The on-line monitoring of motor rotor winding interturn short-circuit failure, it can be found that slighter shorted-turn fault.Detection coil is being sent out
Motor manufacturing or overhaul stage install, and reliability is high and does not disturb electromotor normally to run, and this turns for preventing hydrogenerator
Sub- winding interturn short-circuit failure deteriorates, reduces economic loss and raising stability of power system that the unplanned outage time causes
Suffer from significance.
Description of the drawings
Fig. 1 is the excitation magnetic potential schematic diagram after rotor interturn short-circuit；
Fig. 2 is hydrogenerator two-dimensional simulation model；
Fig. 3 is hydrogenerator zero load main field Local map；
Fig. 4 is hydrogenerator nominal load main field Local map；
Fig. 5 is new detection coil structure and scheme of installation；
Fig. 6 is detection coil induced voltage Local map when hydrogenerator zero load rotor windings are short-circuit in various degree；
Fig. 7 is detection coil induced voltage Local map when hydrogenerator nominal load rotor windings are short-circuit in various degree；
Detection coil output voltage and electricity of front 0.04S moment when Fig. 8 is nominal load rotor magnetic pole short circuit in winding 10%
The deviation of pressure.
In figure：1st, failure magnetic pole, 2, normal magnetic pole, 3, normal pole magnetic flux density, 4, failure pole magnetic flux density, 5, damping
Bar, 6, rotor magnetic pole unshakable in one's determination, 7, stator winding, 8, stator core, 9, rotor windings, 10, high resistance measurement, 11, detection coil.
Specific embodiment
The standardized element arrived used in the present invention can commercially, and shaped piece is according to description and accompanying drawing
Recording can carry out customized, and the concrete connected mode of each part is using ripe bolt in prior art, rivet, weldering
The conventional meanses such as connect, paste, will not be described in detail herein.
In text, each symbol inventory is：ωr, rotor rotation mechanical angular velocity；ω, the angular rate of rotor rotation, ω=2
π f=314 (rad/S)；L, the axial effective length of detection coil；R, the length of the probe distance rotor center of detection coil；P、
The number of pole-pairs of hydrogenerator；I, odd number, i.e. i=1,3,5 ...；Bi, the close amplitude of i subharmonic magnetic；θr, along rotor circumference
Mechanical angle；Ff, excitation magnetic potential after rotor interturn short-circuit failure；T, time；K, positive integer, 1≤k≤P-1；V, detection
Coil output voltage.
A specific embodiment of the invention is comprised the following steps：
A, the U-shaped detection coil for installing radial direction in generator across stator core segment, the outfan of U-shaped detection coil
Mouth high resistance measurement in parallel, using online data collection and the voltage signal of real-time analyzer processing detection coil output；
B, in generator operation, using on-line acquisition system Real-time Collection U-shaped detection coil export voltage letter
Number, and real-time data processing is carried out to the voltage signal for collecting, compare the inswept U-shaped detection line of same position of different magnetic poles
During circle in detection coil induced voltage deviation, when voltage difference exceeds given threshold, judge that the hydrogenerator is present and turn
Sub- winding interturn short-circuit failure.
During U-shaped detection coil that the same position of different magnetic poles is inswept in detection coil the deviation of induced voltage and rotor around
Group shorted-turn fault degree is directly proportional.
Use different magnetic poles same position inswept U-shaped detection coil when in detection coil induced voltage deviation conduct
Failure criterion.
Use different magnetic poles same position inswept U-shaped detection coil when in detection coil induced voltage deviation conduct
Failure criterion.
The real-time magnitude of voltage of collection is compared with the historical data of the integral multiple for being separated by 0.02S, deviation is：
A=v (t)-v (t-k × 0.02)
Can determine that hydrogenerator has rotor interturn short-circuit failure when a exceedes given threshold；
Wherein, v is magnitude of voltage, and t is acquisition time, and k is positive integer.
Failure determination threshold is set as 0.15V.
The rotor windings of hydrogenerator are centralized configuration, when the part winding of rotor magnetic pole occurs turn-to-turn short circuit
Afterwards, it is zero to be shorted winding internal current, and the effective turn of the magnetic pole is reduced, and produced excitation magnetic potential is significantly less than normal magnetic flux
Pole, sees Fig. 1.
The imbalance of generator excitation magnetic potential will further result in the imbalance of main field, as hydrogenerator is inequality
Even gap structure, and there is saturation, fluting phenomenon, therefore, mmf wave differs larger with the waveform of main field, in order to accurately count
The each harmonic that calculates in hydrogenerator main field is needed by numerical analysis methods such as finite elements.Below with certain 550MW water wheels
Electromotor is shown in Table 1 as example, parameter.
1 Parameters of Hydro-generator of table
Fig. 2 is shown in by the dimension phantom of hydrogenerator 2 that builds.
Emulation is divided into two kinds of operating modes to be carried out, i.e. the operation of electromotor zero load rated voltage and band rated load operation, sets respectively
Put normal rotor magnetic pole winding, short circuit 5%, short circuit 10%, short circuit 15% and short circuit 20%, obtained power generator air gap master
Magnetic field is as shown in Figure 3 and Figure 4：
Can see from Fig. 3 and Fig. 4：No matter hydrogenerator is unloaded or load running, when rotor windings are normal, respectively
The magnetic field size of magnetic pole is essentially identical；After certain magnetic pole winding occurs shorted-turn fault, the magnetic field of the magnetic pole is just significantly less than
The magnetic field of normal pole, the magnetic field of two magnetic poles adjacent with the magnetic pole has also been weakened.
The general stator core of high-rating generator adopts hydrogen-cooled structure, stator core to be axially subdivided into some sections, Duan Yuduan
Between circulate hydrogen.The said structure of hydrogenerator provides sensor installation for the diagnosis of rotor interturn short-circuit failure
Space, is set forth below a kind of novel electricity generator magnetic field detection coil, and its structure and mounting means are as shown in Figure 5.
The detection coil presents U-shaped, radially surrounds a stack of lamination of hydraulic generator stator, that U-shaped bottom is located at is fixed,
Air gap between rotor.In rotor rotation process, stator iron yoke flows through main flux, and detection coil surrounds stator iron yoke, therefore, inspection
The induced voltage of test coil reflects the main field of hydrogenerator.When hydrogenerator magnetic pole winding occurs turn-to-turn short circuit
Afterwards, the magnetic field of the magnetic pole is substantially weakened, and the voltage signal of detection coil sensing can reflect this phenomenon, and then be diagnosed to be water wheels
The rotor interturn short-circuit failure of electromotor.
By taking hydrogenerator no-load running as an example, power generator air gap magnetic flux density can be expressed as：
It is assumed that initial time detection coil is located just at rotor some N pole axis line position, through the magnetic flux of detection coil
It is zero.As rotor rotates, the magnetic flux through detection coil starts to increase, and after the t times, the magnetic flux through detection coil can
To be expressed as：
The exchange potential sensed by detection coil can be expressed as：
Knowable to above formula：The detection coil is substantially a kind of magnetic-field measurement coil, the electromotive force sensed by detection coil
It is of similar shape with power generator air gap magnetic field.
After hydrogenerator occurs in that Exciting Windings for Transverse Differential Protection short circuit, the magnetic field of rotor fault magnetic pole is obviously reduced, therefore, when the event
During the detection coil that barrier magnetic pole is inswept to be fixed in stator core, the voltage magnitude sensed by detection coil also will be less than other magnetic
The situation of extremely inswept detection coil.
By taking aforementioned 550MW hydrogenerators as an example, electromotor zero load rated voltage operation, be respectively provided with rotor magnetic pole around
Group is normal, short circuit 5%, short circuit 10%, short circuit 15% and short circuit 20%, detection coil induced voltage is as shown in Figure 6.
As seen from Figure 6：After the rotor windings of hydrogenerator magnetic pole occur shorted-turn fault, when the magnetic pole
When detection coil, the voltage for being sensed is significantly lower than the magnitude of voltage of normal magnetic pole, and degree of short circuit is more serious, and above-mentioned deviation is got over
Greatly.
During electromotor band nominal load, detection coil induced voltage is as shown in Figure 7.As seen from Figure 7：Work as hydraulic generator
After the rotor windings of machine magnetic pole occur shorted-turn fault, when the magnetic pole is through detection coil, the voltage for being sensed is obvious
Voltage less than normal magnetic pole.
According to above-mentioned phenomenon, it is possible to use during U-shaped detection coil that the same position of different magnetic poles is inswept in detection coil
The deviation of induced voltage specifically can be implemented according to the following steps as failure criterion：
Acquisition testing coil output voltage signal is simultaneously preserved, by the real-time magnitude of voltage and the integer for being separated by 0.02S of collection
Historical data again is compared, and deviation is：
A=v (t)-v (t-k × 0.02)
Can determine that hydrogenerator has rotor interturn short-circuit failure when a exceedes given threshold.
For example, by electromotor rated load operation and as a example by rotor magnetic pole short circuit in winding 10%, detection coil is exported
Current voltage value be compared with the detection coil output voltage values of front 0.04S moment (k=2), obtain the rotation of rotor one
In cycle (0.42S), the deviation of two groups of voltages is shown in Fig. 8.There is a larger direct impulse of amplitude in Fig. 8 and an amplitude is larger
Negative-going pulse, wherein direct impulse is the moment of the inswept detection coil of failure groove, at this moment detection coil induced voltage and 0.04S
The voltage that the normal magnetic pole at front moment is sensed in detection coil has obvious deviation；After 0.04S, normal magnetic pole is inswept
Detection coil, the voltage that at this moment failure magnetic pole is sensed in the detection coil be as historical data (moment before 0.04S) with current
Data compare, and therefore there is also an obvious deviation.
It can be seen that, when hydraulic generator rotor winding has shorted-turn fault, in a swing circle of rotor
(0.42S), in, above-mentioned voltage difference waveform will produce 2 larger pulses of amplitude, a direct impulse and a negative-going pulse,
The distance of positive and negative pulse is equal to 0.02k, and k value is bigger, and the distance between positive and negative pulse is bigger.If it is short to there is no turn-to-turn in rotor windings
Road failure, the then pulse that voltage difference waveform will not have amplitude larger occur.Hydraulic generator can be diagnosed according to features described above
Whether machine there is rotor interturn short-circuit failure.
Using detection coil, the amplitude difference of induced voltage can go out hydrogenerator with efficient diagnosis at the different magnetic poles
Rotor interturn short-circuit failure, it can be found that the slighter rotor interturn short-circuit failure of hydrogenerator, with rotor
Winding interturn short-circuit degree increases, and detection coil difference in magnitude mutation of induced voltage at the different magnetic poles is big, therefore, this method
The order of severity and development trend of rotor interturn short-circuit failure can also be reflected.
In describing the invention, it is to be understood that term " longitudinal direction ", " horizontal ", " on ", D score, "front", "rear",
The orientation of instruction such as "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward " or position relationship are based on accompanying drawing institute
The orientation for showing or position relationship, are for only for ease of the description present invention, rather than indicate or imply that the device or element of indication must
Therefore must be not considered as limiting the invention with specific orientation, with specific azimuth configuration and operation.
The ultimate principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not restricted to the described embodiments, simply explanation described in above-described embodiment and description this
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement is both fallen within scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (5)
1. a kind of hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil, it is characterised in that including following
Step：
A, the U-shaped detection coil for installing radial direction in generator across stator core segment, the output port of U-shaped detection coil is simultaneously
Connection high resistance measurement, using online data collection and the voltage signal of real-time analyzer processing detection coil output；
B, in generator operation, using on-line acquisition system Real-time Collection U-shaped detection coil export voltage signal, and
Real-time data processing is carried out to the voltage signal for collecting, compare different magnetic poles same position inswept U-shaped detection coil when
The deviation of induced voltage in detection coil, when voltage difference exceed given threshold when, judge the hydrogenerator exist rotor around
Group shorted-turn fault.
2. the hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil according to claim 1, its
It is characterised by：During U-shaped detection coil that the same position of different magnetic poles is inswept in detection coil the deviation of induced voltage and rotor
Winding interturn short-circuit fault degree is directly proportional.
3. the hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil according to claim 2, its
It is characterised by：During U-shaped detection coil inswept using the same position of different magnetic poles, in detection coil, the deviation of induced voltage is made
For failure criterion.
4. the hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil according to claim 3, its
It is characterised by：The real-time magnitude of voltage of collection is compared with the historical data of the integral multiple for being separated by 0.02S, deviation is：
A=v (t)-v (t-k × 0.02)
Can determine that hydrogenerator has rotor interturn short-circuit failure when a exceedes given threshold；
Wherein, v is magnitude of voltage, and t is acquisition time, and k is positive integer.
5. the hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil according to claim 1, its
It is characterised by：Failure determination threshold is set as 0.15V.
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| CN201611156461.3A CN106501665B (en) | 2016-12-15 | 2016-12-15 | Hydraulic generator rotor winding interturn short-circuit diagnostic method based on detection coil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107876936A (en) * | 2017-11-03 | 2018-04-06 | 唐山松下产业机器有限公司 | Arc-welding equipment, electric arc welding controller and control method |
| CN108490294A (en) * | 2018-04-03 | 2018-09-04 | 中国重汽集团济南动力有限公司 | A kind of generator of heavy truck failure detector and method |
| CN112034344A (en) * | 2020-09-09 | 2020-12-04 | 北京华科同安监控技术有限公司 | Real-time online diagnosis method for turn-to-turn short circuit fault of rotor winding of hydraulic generator |
| CN116231972A (en) * | 2023-01-17 | 2023-06-06 | 华南理工大学 | System and method for detecting temperature of winding of rotor of wound induction hydraulic generator |
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| CN108490294B (en) * | 2018-04-03 | 2024-07-19 | 中国重汽集团济南动力有限公司 | Heavy-duty car generator fault detection device and method |
| CN112034344A (en) * | 2020-09-09 | 2020-12-04 | 北京华科同安监控技术有限公司 | Real-time online diagnosis method for turn-to-turn short circuit fault of rotor winding of hydraulic generator |
| CN116231972A (en) * | 2023-01-17 | 2023-06-06 | 华南理工大学 | System and method for detecting temperature of winding of rotor of wound induction hydraulic generator |
| CN116231972B (en) * | 2023-01-17 | 2023-12-19 | 华南理工大学 | System and method for detecting temperature of winding of rotor of wound induction hydraulic generator |
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| CN106501665B (en) | 2019-07-09 |
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