On-line monitoring method for inter-turn short circuit fault of pumped-storage generator motor excitation winding
A technology for inter-turn short-circuit fault and generator motor, which is applied in the field of on-line monitoring of inter-turn short-circuit faults of excitation windings of pumped-storage generator motors, and can solve the problems of high difficulty and small harmonic components.
Active Publication Date: 2017-12-15
SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD
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However, considering the actual operation conditions, it is very difficult to accurately and effectively extract these fault characteristics. On the one hand, because the accurate working frequency range of the current transformer for protection is 10-70Hz, it can only reflect the fractional harmonics of certain frequencies. Unbalanced current; on the other hand, when the number of short-circuit turns is small, the harmonic components of the branch (group) unbalanced current are very small
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[0016] The invention relates to an on-line monitoring method for inter-turn short-circuit faults of excitation windings of pumped-storage generator motors, in particular to an on-line monitoring method for inter-turn short-circuit faults of excitation windings of pumped-storage generator motors with seven branches per phase. The invention utilizes the branch group current transformer configured by the main protection to extract a specific harmonic component from each phase current, calculate its total effective value as the fault characteristic quantity, and obtain the harmonic component which is approximately proportional to the excitation current under normal operating conditions of the motor. The inherent fractional harmonic components of the branch current constitute the monitoring alarm value. When the fault characteristic value is greater than the monitoring alarm value, a fault alarm signal for the inter-turn short circuit fault of the excitation winding is issued.
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The present invention is an on-line monitoring method for inter-turn short-circuit faults of excitation windings of pumped-storage generator motors. The present invention utilizes branch group current transformers configured for main protection to extract specific harmonic components from each phase current and calculate its total effective value As the fault characteristic quantity, the monitoring and alarm value is composed of the inherent fractional harmonic component of the branch current that is approximately proportional to the excitation current under normal operating conditions of the motor. When the fault characteristic quantity is greater than the monitoring and alarm value, a short circuit fault between the turns of the excitation winding fault alarm signal. The present invention analyzes the inter-turn short circuit of the excitation winding under the rated grid-connected power generation operation condition of the generator motor, and extracts the unique characteristics of the inter-turn short circuit of the excitation winding that are different from the internal short circuit of the stator and the external short circuit of various machine terminals and other common faults of motors. Features, realize on-line monitoring of turn-to-turn short circuit of field winding of seven-branch generator motor for each phase.
Description
technical field [0001] The invention relates to an on-line monitoring method for inter-turn short-circuit faults of excitation windings of pumped-storage generator motors, in particular to an on-line monitoring method for inter-turn short-circuit faults of excitation windings of pumped-storage generator motors with seven branches per phase, belonging to pumped-storage power generation Innovative technology of online monitoring method for inter-turn short circuit fault of motor excitation winding. Background technique [0002] Since the 1990s, my country's pumped storage power stations have entered a period of rapid development. Especially in recent years, a large number of new units have been put into operation, and domestic units have also been used one after another. However, due to the high speed of pumped storage power generation motors, large unit capacity, complex operating conditions and frequent start-ups, the operating environment is worse than that of general hydro...
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IPC IPC(8): G01R31/06
Inventor 陈满聂靓靓孙宇光黄俊恺陶诗迪
Owner SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATION GENERATING CO LTD