On-line Monitoring Method for Turn-to-turn Short-Circuit Fault of Generator Motor Rotor Winding
A technology for inter-turn short-circuit faults and generator motors, which is applied in the field of fault monitoring of main equipment in power systems, can solve problems such as short-circuit faults of rotor windings, and achieve high sensitivity and selectivity
Active Publication Date: 2019-01-11
STATE GRID CORP OF CHINA +2
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[0007] The purpose of the present invention is to solve the problem of inter-turn short-circuit fault of the rotor winding of the generator motor with 8 pairs of poles in the pumped storage power plant. On the basis of simulation calculations, the present invention proposes an online monitoring scheme for inter-turn short-circuit faults of rotor windings
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] After a multi-pole, multi-branch synchronous motor has an inter-turn short circuit fault in the excitation winding, a fractional harmonic unbalanced current will be generated inside the stator phase winding, which can be detected by the current mutual inductance for zero-sequence current type transverse difference protection configured by the motor. The reactor reaction will be described in detail through specific calculations below.
[0040] The following is an analysis of the Yixing power station generator motor with 8 pairs of poles, a rated phase current of 10191A, and a total number of turns of 528 excitation windings;
[0041] Using the multi-loop mathematical model, the inter-turn short-circuit fault of the excitation winding with a small number of turns is calculated under the rated power generation condition of the motor network, and the...
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The invention relates to a method for online monitoring on generator rotor winding inter-turn short circuit faults. According to the method, a neutral inter-point current transformer TA0 configured for zero sequence current type transverse differential protection is utilized, 3 / 8 times and 5 / 8 times harmonic components are extracted from an unbalanced current entering the transformer TA0, or 15-35Hz components are acquired through a band-pass filter, the total effective value is taken as a fault monitoring amount Iop; according to the actual operation recording data in the normal operation condition, a monitoring alarm value Ialarm is set. When the monitoring amount Iop is greater than the monitoring alarm value Ialarm, an alarm signal for the rotor excitation winding inter-turn short circuit fault is emitted, and whether downtime maintenance is carried out is determined after an operator checks the recording signal.
Description
technical field [0001] The invention belongs to the technical field of fault monitoring of main equipment in electric power systems, in particular an on-line monitoring method for short-circuit faults between turns of rotor windings, which is proposed for the structural characteristics of generator motors in pumped storage power stations with 8 pairs of poles and common main protection hardware configurations . Background technique [0002] At present, the generator motors of pumped storage power stations have a higher probability of inter-turn faults in the rotor excitation winding than ordinary hydro generators due to more complex operating conditions and frequent starts than ordinary generators. At present, the traditional methods for detecting inter-turn short-circuit faults of motor excitation winding mainly include: open transformer method, AC impedance and power loss method, DC impedance method, no-load and short-circuit characteristic test method, etc. These detectio...
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IPC IPC(8): G01R31/06
CPCG01R31/72
Inventor 朱冠宏王霆于辉徐伟孟繁聪狄洪伟宋晋红蒋洁青蒋程晟陆婷吴闽
Owner STATE GRID CORP OF CHINA