Test device and method for generator rotor winding inter-turn short-circuit fault monitoring device

Abstract

The invention discloses a test device for a generator rotor winding turn-to-turn short-circuit fault monitoring device. The test device comprises an HMI human-machine interface module, a calculation module, two DA conversion modules, two signal amplification output modules and a power supply module. The invention further discloses a test method for the generator rotor winding turn-to-turn short-circuit fault monitoring device. The test method comprises the steps of: firstly, setting fixed value parameters of output waveforms; secondly, calculating simulated key phase signal data and detectioncoil voltage data; thirdly, transmitting a simulated key phase signal and a simulated detection coil voltage signal to a tested rotor winding turn-to-turn fault monitoring device after DA conversion and amplification; and finally, checking whether signal sampling, fault feature calculation and logical judgment results of the tested rotor winding turn-to-turn fault monitoring device are correct. The test device and the test method can generate voltage waveforms similar to voltage waveforms actually measured by means of a field detection coil, simulate normal waveforms and fault waveforms, can verify whether the signal sampling, fault feature calculation and logic judgment of the monitoring device are correct in advance before the installation of equipment.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of power system equipment, in particular to the monitoring of inter-turn short-circuit faults of rotor windings of steam turbine generators. Background technique [0002] With the rapid development of the power system, in some countries and regions, the steam turbine generator set with a rated capacity of 600MW has become the main unit of the power system. Due to the complex structure of the rotor of the turbogenerator and the difficult manufacturing process, the rotor winding is subjected to various dynamic stresses such as centrifugal force during operation. Fault" or "turn-to-turn fault") has a high incidence rate. After a fault occurs, it may cause a decrease in the reactive power of the generator, an increase in bearing vibration, and even cause a grounding fault to magnetize the rotor. In severe cases, it may cause burns Journals and bushings. Regarding the impact of rotor turn-to-turn fa...

AI Technical Summary

Problems solved by technology

However, due to the special shape of the induced voltage waveform of the detection coil, there is often no way to calibrate the monitoring device before the equipment leaves the factory and is put into operation. It is impossible to use a general-purpose relay protection tester or a general-purpose signal generator to generate a similar voltage. Waveform, that is, there is no effective means to input a suitable voltage signal to the detection coil voltage input terminal of the monitoring device, and it is difficult to verify in advance whether the signal sampling, fault feature calculation, and logical judgment of the monitoring device are correct

At present, the monitoring device is always installed and used on site after production. Only when the generator is running and the voltage signal generated by the detection coil on site is input to the monitoring device, the equipment commissioning personnel can observe whether the sampling data of the device is correct; in addition, because the generator is normal If there is no inter-turn fault of the rotor, the voltage signal generated by the detection coil is a normal waveform instead of an abnormal waveform when the rotor inter-turn fault occurs, so it is difficult to check in advance whether the fault feature calculation and logical judgment of the monitoring device are correct

[0005] In short, due to the special shape of the detection coil induced voltage waveform, the monitoring device lacks effective verification methods before the equipment leaves the factory and is put into operation, so problems cannot be found in advance. After the generator is running, it is found that there is a problem with the monitoring device. It will be very passive to replace plug-ins, programs, or even equipment

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