Comprehensive off-line test platform for generator rotor insulation measurement device

Abstract

The invention discloses a comprehensive off-line test platform for a motor rotor insulation measuring device, which includes a rotating test platform and a console connected to the rotating test platform. The rotating test platform includes a motor installed on the rotating test platform, a slip ring shaft, a slip ring and First carbon brush. The slip ring shaft is connected to the drive shaft of the motor, and the slip ring is sleeved on the slip ring shaft and rotates with the slip ring shaft. During the test, the motor reaches the rated speed, and the first carbon brush contacts the slip ring by lifting the brush and outputs an electrical signal. The console includes motor power distribution and control circuit, carbon brush power distribution and control circuit, and oscilloscope. During the test, use the oscilloscope to record waves to confirm that the waveform of the input electrical signal has no clutter, so as to ensure that when the motor reaches the rated speed, the first A carbon brush is always in contact with the slip ring and the first carbon brush does not jump on the surface of the slip ring. After testing, it can be guaranteed that the first carbon brush will not jump on the surface of the slip ring, thereby solving the problem of false alarm of the generator rotor grounding protection.

Description

technical field [0001] The invention relates to the field of false alarm simulation experiments of a generator rotor insulation measuring device, in particular to a comprehensive off-line test platform for a generator rotor insulation measuring device. Background technique [0002] The generator rotor insulation measurement device uses a pair of electromagnets or spring-type carbon brush contact slip rings to apply power frequency injection signals between one pole of the rotor winding and the ground, and the measurement device measures the injected current to calculate the rotor-to-ground insulation. value. [0003] During operation, because the carbon brush jumps on the surface of the high-speed rotating slip ring, the measurement signal current is interrupted and then turned on again, because the capacitor voltage cannot change suddenly, causing waveform distortion, and the measurement device is wrong, causing false alarms. [0004] It is necessary to ensure that the par...

AI Technical Summary

Problems solved by technology

[0005] The current difficulty is that after the disassembly and assembly of the carbon brushes and slip rings during the overhaul, the generator has not rushed to the rated speed, the static test means are limited, and it is difficult to judge the static installation quality

What is more difficult is that the static test cannot fully guarantee that the carbon brush will not jump on the surface of the slip ring after the generator runs

However, once the generator is running, the carbon brush is in the high-speed rotating equipment accessories, and the slip ring itself is rotating at a high speed, so it cannot be disassembled and adjusted. If an alarm occurs, the adjustment can only be made after the generator is shut down for the next overhaul. Operation causes great disturbance

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