CN105425100B - A kind of rotor inter-turn short circuit fault degree measurement and pinpoint method - Google Patents
A kind of rotor inter-turn short circuit fault degree measurement and pinpoint method Download PDFInfo
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- CN105425100B CN105425100B CN201510740474.4A CN201510740474A CN105425100B CN 105425100 B CN105425100 B CN 105425100B CN 201510740474 A CN201510740474 A CN 201510740474A CN 105425100 B CN105425100 B CN 105425100B
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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 rotor inter-turn short circuit fault degree measurement and pinpoint methods, it is characterized in that, apply the constant-current dc voltage of a safety on static slip ring or axial lead, then each group coil voltage is measured, the voltage or voltage difference at each corresponding position of its two poles of the earth winding of the rotor without shorted-turn fault are suitable, and then the group number of coil where can tentatively judging short circuit, the voltage condition for measuring every turn-to-turn again calculates short dot position and degree of short circuit according to the voltage value between short-circuit circle.Kirchhoff's current law (KCL) is introduced into the lookup of rotor inter-turn short circuit fault point by the present invention, the specific location of fault point can be determined before rotor disintegrates and repairs, subsequent programme of work scientifically and rationally, is targetedly formulated according to position of failure point, repair cost and period are greatly reduced, to save a large amount of human and material resources and financial resources, huge economic loss is retrieved.
Description
Technical field
The present invention relates to a kind of rotor inter-turn short circuit fault degree measurement and pinpoint methods.
Background technology
Generator rotor interturn short-circuit failure accounts for larger proportion in rotor electrical insulation fault, and turn-to-turn occurs in rotor
Short trouble needs timely processing to fall, and such as can determine that the specific location of fault point in advance, it is possible at the processing cost of very little
Reason falls shorted-turn fault.In addition, shorted-turn fault is happened at the different parts of rotor, processing scheme and processing cost are just
It might have prodigious difference.If the position of fault point is determined before repairing, so that it may scientifically and rationally, targetedly to make
Fixed subsequent programme of work, repair cost and period are greatly reduced, to save a large amount of human and material resources and financial resources, retrieve huge
Big economic loss.And common rotor windings direct current resistance m easurem ent method, AC impedance and loss test, the two poles of the earth in current industry
Balance experiment, RSO test method(s)s, voltage's distribiuting method etc. all can not or be difficult position and the turn-to-turn short circuit that fault point is accurately positioned
Degree.Therefore, the positioning of shorted-turn fault point is an important technology, and " a kind of rotor inter-turn short circuit fault point is fixed for patent
The method of position " proposes good technical solution.
It can reflect shorted-turn fault on rotor windings direct current resistance m easurem ent law theory, but electric caused by when turn-to-turn short circuit
The variation of resistance slippage may be also smaller than the error that tester or temperature are converted and can only be qualitatively judged；AC impedance and damage
Consumption experiment, the two poles of the earth balance experiment, RSO test method(s)s can only be qualitatively judged whether there is or not turn-to-turn short circuit but can not be positioned；Voltage's distribiuting method
It can position in some cases and the turn-to-turn fault of dead short is positioned, but measured deviation is big.
Invention content
It is to be solved by this invention to be to provide a kind of rotor inter-turn short circuit fault degree measurement and pinpoint method.
To solve the above-mentioned problems, the present invention provides a kind of rotor inter-turn short circuit fault degree measure and it is pinpoint
Method, which is characterized in that apply the constant-current dc voltage of a safety on static slip ring or axial lead, then measure each
Group coil voltage, the voltage or voltage difference at each corresponding position of its two poles of the earth winding of the rotor of no shorted-turn fault are suitable,
And then the group number of coil where can tentatively judging short circuit, then the voltage condition of every turn-to-turn is measured, according to the electricity between short-circuit circle
Pressure numerical computations go out short dot position and degree of short circuit.
Preferably, following steps are specifically included：
The first step：The alternating current that 100V~200V constant pressures are inputted at rotor leading wire, measures the voltage's distribiuting of every group of coil,
By comparing the voltage difference of the two poles of the earth jack per line coil, the group number of the preliminary place coil for judging shorted-turn fault point；
Second step：The direct current of 10A~20A constant currents is inputted at rotor leading wire, group number coil where measuring fault point is each
The voltage value between voltage value and another extremely same every circle of group coil between circle, while record current direction；
Third walks：Calculate the specific location of fault point, i.e. rotor inter-turn short circuit position：
Any four point of winding on rotor is chosen as voltage measurement point 1,2,3,4, the length of a circle coil is L, because
The section of copper bar is the same, and D.C. resistance is directly proportional to copper bar length, resistance per unit length RL, the turn-to-turn voltage of short-circuit circle is
U23, the turn-to-turn voltage adjacent with short-circuit circle along current direction is U12, normal turn-to-turn voltage is U, short circuit current Id, short circuit
The distance of point and measurement point is Ld, along from the point of view of current direction：
1) measurement point and fault point distance LdThe calculating of/L：
U23=IRLLd+(I-Id)RL(L-Ld)=IRL L-Id RL(L-Ld)
U12=(I-Id)RL Ld+IRL(L-Ld)=IRL L-Id RL Ld
∴Id=(IRL L-U12)/RL Ld
U23=IRL L-(IRL L-U12)(L-Ld)/Ld
U23Ld=IRL L Ld-IRL L L-U12Ld+U12L+IRL L Ld
(2I RL L-U23-U12)Ld=(IRL L-U12)L
∴(2U-U23-U12)Ld=(U-U12)L
Ld/ L=(U-U12)/(2U-U23-U12)
Wherein, U is the voltage of not short-circuit circle；
2) rotor inter-turn short circuit point degree of short circuit (I-IdThe calculating of)/I：
U23+U12=IRLLd+(I-Id)RL(L-Ld)+(I-Id)RL Ld+I RL(L-Ld)
U23+U12=IRLL+(I-Id)RL L
U23+U12-IRLL=(I-Id)U/I
(I-Id)/I=(U12+U23-U)/U
Wherein, U is the voltage of not short-circuit circle.
Preferably, the normal turn-to-turn voltage U can be measured by measuring another pole same location coil.
It is an advantage of the invention that method is simple and convenient to operate, accurate positioning, and it can be adapted for any gas cooling mode
Rotor inter-turn short circuit failure judgement.
The design feature of present invention combination rotor of steam turbo generator rationally utilizes Kirchhoff's current law (KCL), passes through substep
Lookup, scientific algorithm, precise positioning come achieve the purpose that search fault point, it is crucial that computational methods will be at turn-to-turn short circuit
Electric current is taken into account, and the shortcomings that existing method can only calculate dead short and can not calculate degree of short circuit has been abandoned, and accurate can calculate
Go out the specific location and degree of short circuit of rotor inter-turn short circuit.
Kirchhoff's current law (KCL) is introduced into the lookup of rotor inter-turn short circuit fault point by the present invention, can be disintegrated in rotor and be repaiied
The specific location that fault point is determined before reason, subsequent work side scientifically and rationally, is targetedly formulated according to position of failure point
Case, repair cost and period are greatly reduced, and to save a large amount of human and material resources and financial resources, retrieve huge economic loss.
Description of the drawings
Fig. 1 is the circuit diagram of winding on rotor.
Specific implementation mode
In order to make the present invention more obvious and understandable, hereby with preferred embodiment, and attached drawing is coordinated to be described in detail below.
Embodiment
A kind of rotor inter-turn short circuit fault degree measurement and pinpoint method, specifically include following steps：
The first step：As shown in Figure 1, inputting the alternating current of 100V~200V constant pressures at rotor leading wire, every group of coil is measured
Voltage's distribiuting, by comparing the voltage difference of the two poles of the earth jack per line coil, the group of the preliminary place coil for judging shorted-turn fault point
Number；
Second step：The direct current of 10A~20A constant currents is inputted at rotor leading wire, group number coil where measuring fault point is each
The voltage value between voltage value and another extremely same every circle of group coil between circle, while record current direction；
Third walks：Calculate the specific location of fault point, i.e. rotor inter-turn short circuit position：
Any four point of winding on rotor is chosen as voltage measurement point 1,2,3,4, the length of a circle coil is L, because
The section of copper bar is the same, and D.C. resistance is directly proportional to copper bar length, resistance per unit length RL, the turn-to-turn voltage of short-circuit circle is
U23, the turn-to-turn voltage adjacent with short-circuit circle along current direction is U12, normal turn-to-turn voltage is U, short circuit current Id, short circuit
The distance of point and measurement point is Ld, along from the point of view of current direction：
1) measurement point and fault point distance LdThe calculating of/L：
U23=IRLLd+(I-Id)RL(L-Ld)=IRL L-Id RL(L-Ld)
U12=(I-Id)RL Ld+IRL(L-Ld)=IRL L-Id RL Ld
∴Id=(IRL L-U12)/RL Ld
U23=IRL L-(IRL L-U12)(L-Ld)/Ld
U23Ld=IRL L Ld-IRL L L-U12Ld+U12L+IRL L Ld
(2I RL L-U23-U12)Ld=(IRL L-U12)L
∴(2U-U23-U12)Ld=(U-U12)L
Ld/ L=(U-U12)/(2U-U23-U12)
Wherein, U is the voltage of not short-circuit circle；
2) rotor inter-turn short circuit point degree of short circuit (I-IdThe calculating of)/I：
U23+U12=IRLLd+(I-Id)RL(L-Ld)+(I-Id)RL Ld+IRL(L-Ld)
U23+U12=IRLL+(I-Id)RL L
U23-+-U12-IRLL=(I-Id)U/I
(I-Id)/I=(U12+U23-U)/U
Wherein, U is the voltage of not short-circuit circle, can be measured by measuring another pole same location coil.
It is that turn-to-turn short circuit accident occurs for certain power generator unit rotor below, turn-to-turn short circuit is searched by the above method
Point.
1,200V alternating currents are passed through at rotor the two poles of the earth using testing transformer.
| P1 is upward | P1 is towards a left side | P1 is towards the right side | P1 is downward | |
| Total input | 199.7 | 199.2 | 200.1 | 200.1 |
| P1 | 107.8 | 102.1 | 107.7 | 107.5 |
| P2 | 91.9 | 92.2 | 92.2 | 92.8 |
| Difference | 15.9 | 14.9 | 15.5 | 14.7 |
Judge that there are turn-to-turn short circuit points for the poles P2 by data above.
2, using testing transformer 100V is passed through at the two poles of the earth.
Unit：V
| A-C | C-E | E-G | G-I | |
| P1 | 9.4 | 13.9 | 14.8 | 14.7 |
| P2 | 9.3 | 13.6 | 9.1 | 13.8 |
| Difference | 0.1 | 0.3 | 5.7 | 0.9 |
By above-mentioned experiment, 5#, 6# coil of the poles P2 are suspected malfunctions coil.
3, the two poles of the earth are passed through using constant current source (10A), the distribution of 5#, 6# coil one turn voltage is measured from disposed at air vent.
5# coil turn-to-turns voltage's distribiuting (measurement point is encouraging end) unit：V
| P1 | P2 | |
| U12 | 6.4 | 6.4 |
| U23 | 6.4 | 6.3 |
| U34 | 6.3 | 6.2 |
| U45 | 6.2 | 6.1 |
| U56 | 6.2 | 6.1 |
| U67 | 6.3 | 6.2 |
| U78 | 6.1 | 6.2 |
By above-mentioned experiment, 5# coils are without exception.
6# coil turn-to-turns voltage's distribiuting (measurement point is encouraging end) unit：V
| P1 | P2 | |
| U12 | 6.4 | 6.5 |
| U23 | 6.3 | 1.8 |
| U34 | 6.3 | 5.7 |
| U45 | 6.2 | 6.4 |
| U56 | 6.2 | 6.2 |
| U67 | 6.3 | 6.3 |
| U78 | 6.2 | 6.8 |
By above-mentioned experiment, 6# coils the 2nd circle to the 4th circle is abnormal position.
According to the formula of test data and reckoning --- Ld/ L=(U-U12)/(2U-U23-U12) short dot that can calculate
Position is 0.88L (L is a circle coil perimeter), and according to design drawing size, computable fault point approximate location is away from measurement
Point 520mm is encouraging end end position.
According to result of calculation trouble-shooting point after rotor disintegration.Actual fault point in 6# coils the 3rd circle to the 4th turn-to-turn,
Distance measurement point 590mm.
Claims (2)
1. a kind of rotor inter-turn short circuit fault degree measures and pinpoint method, which is characterized in that in static slip ring or
The constant-current dc voltage for applying a safety on axial lead, then measures each group coil voltage, and no shorted-turn fault turns
The voltage or voltage difference at each corresponding position of its sub the two poles of the earth winding are suitable, and then can tentatively judge short circuit place coil
Group number, then the voltage condition of every turn-to-turn is measured, short dot position and short-circuit journey are calculated according to the voltage value between short-circuit circle
Degree；Specifically include following steps：
The first step：The alternating current that 100V ~ 200V constant pressures are inputted at rotor leading wire, measures the voltage's distribiuting of every group of coil, passes through
Compare the voltage difference of the two poles of the earth jack per line coil, the group number of the preliminary place coil for judging shorted-turn fault point；
Second step：The direct current that 10A ~ 20A constant currents are inputted at rotor leading wire measures where fault point between each circle of group number coil
Voltage value and another extremely with group coil per voltage value between circle, while record current direction；
Third walks：Calculate the specific location of fault point, i.e. rotor inter-turn short circuit position：
Any four point of winding on rotor is chosen as voltage measurement point 1,2,3,4, the length of a circle coil is L, because of copper bar
Section it is the same, D.C. resistance is directly proportional to copper bar length, resistance per unit length RL, the turn-to-turn voltage of short-circuit circle is U23, suitable
It is U the current direction turn-to-turn voltage adjacent with short-circuit circle12, normal turn-to-turn voltage is U, short circuit current Id, short dot and
The distance of measurement point is Ld, along from the point of view of current direction：
1）Measurement point and fault point distance LdThe calculating of/L：
U23=IRLLd+(I-Id) RL ( L- Ld) =I RL L- Id RL (L- Ld）
U12=(I-Id) RL Ld +I RL (L- Ld)=I RL L- Id RL Ld
∴ Id=（I RL L- U12）/ RL Ld
U23=I RLL-（I RL L- U12）（L- Ld）/ Ld
U23 Ld =I RL L Ld -I RL L L - U12 Ld+ U12L+I RL L Ld
（2I RL L- U23- U12）Ld=（I RL L- U12）L
∴（2U- U23- U12）Ld=（U- U12）L
Ld/L = （U- U12）/（2U- U23- U12）
Wherein, U is the voltage of not short-circuit circle；
2）Rotor inter-turn short circuit point degree of short circuit（I-Id）The calculating of/I：
U23+ U12=IRLLd+（I-Id） RL（ L- Ld） +（I-Id） RL Ld +I RL（L- Ld）
U23+ U12= IRLL+（I-Id） RL L
U23+ U12 -IRLL = （I-Id） U/I
（I-Id）/ I=（ U12 + U23-U）/ U
Wherein, U is the voltage of not short-circuit circle.
2. rotor inter-turn short circuit fault degree as described in claim 1 measures and pinpoint method, which is characterized in that institute
Stating normal turn-to-turn voltage U can be measured by measuring another pole same location coil.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107731067B (en) * | 2017-09-29 | 2019-07-02 | 中广核核电运营有限公司 | A kind of any circle short circuit simulator of generator amature and simulation system |
| CN110346685B (en) * | 2019-07-16 | 2020-08-04 | 杭州核诺瓦科技有限公司 | Device and method for detecting turn-to-turn state of stator winding of large motor |
| CN112415433A (en) * | 2019-08-21 | 2021-02-26 | 华东师范大学 | Long-lead short-circuit fault point positioning device and method |
| CN114417574B (en) * | 2021-12-29 | 2023-01-20 | 广东电网有限责任公司 | Method and device for calculating severity of turn-to-turn short circuit |
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