Device and method for detecting state of generator rotor winding

Abstract

The invention discloses a device and method for detecting the state of a generator rotor winding, and belongs to a product in the field of single-end lossless detection of a large-size generator rotorwinding. In the device, a time sequence circuit generates full-cycle pulses, and a high-voltage full-cycle pulse matching generator enables the full-cycle pulses generated by the time sequence circuit to be coupled into a corresponding transient bidirectional rotating magnetic field pulse. The transient bidirectional rotating magnetic field pulse is conducted to two ends of the generator rotor winding and a big shaft through an impedance matching connection line. The transient bidirectional rotating magnetic field pulse and each big coil in a rotor perform a resonant effect. A pulse signal coupling feedback collection circuit enables all waveforms reflected by the generator rotor to be coupled into a magnetic field waveform, and the magnetic field waveform is transmitted to the data collection system through an operational amplifier. A central processing unit transmits a digital information flow to an upper computer. The device can achieve the lossless measurement of the health conditions of each big coil of a big-size generator I or a rotor with a plurality of pole-pairs under the condition of single-end wiring measurement.

Description

technical field [0001] The invention relates to a generator rotor winding state detection device and method, belonging to the field of single-end nondestructive detection of large generator windings. Background technique [0002] Existing domestic and foreign large-scale generators, such as large-scale hydraulic and thermal power generators, large-scale nuclear power generators, the rotor needs to be overhauled regularly, and the main content of the overhaul is the internal winding. It is regular. If the fault occurs between the two inspections, the normal operation of the generator cannot be guaranteed, which will greatly affect the production. At present, the primary parameter detection is generally used for the detection of the rotor winding state of large generators at home and abroad, and the secondary parameters are only the AC impedance voltage divider method and the RSO traveling wave method. The generator is detected, and the change of the rotor of the generator is...

AI Technical Summary

Problems solved by technology

However, the existing methods are relatively rough for the detection accuracy of the winding, and can only have a rough judgment on the rotor. The detection of the details of the winding cannot be achieved by existing instruments.

If each large coil is inspected in detail, and there are probes touching the windings, there are hidden dangers caused by various factors to the windings. The value of the rotor of a large generator can easily be tens of millions or even hundreds of millions, so use the probes to touch the windings for detailed inspection. Checking this method is unscientific and does not conform to operating procedures

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