Open type disconnecting switch mechanical fault diagnosis method based on rotating speed observation

Abstract

The invention relates to an open-type disconnecting switch mechanical fault diagnosis method based on rotating speed observation, and belongs to the technical field of high-voltage disconnecting switch mechanical fault diagnosis. According to the method, the input current and voltage of the isolation switch driving motor are collected at the input end of the motor, the input power of the driving motor is calculated, the rotating speed of the driving motor is observed by designing a motor rotating speed observer, slip power is compensated to obtain the output power of the driving motor, and the output power of the driving motor is calculated according to the energy balance theory. Therefore, the calculation of the output power of the motor is realized on the premise of not arranging a speed sensor, and the on-line monitoring of the mechanical fault of the open-type disconnecting switch is realized.

Description

technical field [0001] The invention belongs to the technical field of mechanical fault diagnosis of a high-voltage isolating switch, and in particular relates to a method for diagnosing a mechanical fault of an open type isolating switch based on rotational speed observation. Background technique [0002] The high-voltage isolating switch is a key switching device in the power system. It is used in a large amount and plays an important role in isolating voltage to ensure the safety of maintenance personnel. Monitoring its mechanical status is a necessary condition to ensure the safe and stable operation of the power system and the personal safety of operation and maintenance personnel. , which is also a necessary condition for the one-button sequential control double confirmation criterion of the power system. The on-line diagnosis of switch mechanical faults based on the monitoring of the electrical signal characteristics of the high-voltage isolating switch drive motor is...

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Problems solved by technology

[0003] However, in actual operation, because the driving motor of the high-voltage isolation switch is mostly open-loop operation, that is, only the three-phase access station of the motor stator is powered, and the start and stop of the motor are controlled by the three-phase front-end contactor and the travel limit switch, and there is no speed. The sensor can only obtain the input power of the motor by measuring the voltage and current at the input end of the motor. Considering the non-linear factors of the motor transmission loss, its input power is difficult to directly represent the operating torque of the spindle, and there are obvious deficiencies in the diagnostic accuracy.

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