Field suppression and over-voltage performance testing instrument applied to excitation system and testing method thereof

Abstract

The invention discloses a field suppression and over-voltage performance testing instrument applied to an excitation system and a testing method thereof. The testing instrument is composed of a voltage adjusting and boosting unit, a rectifier and filter unit, a detection display unit, a function selection pressing plate, a divider resistance sampling unit, and a display unit. The voltage adjusting and boosting unit consists of a regulator, a change-over switch, a first boosting transformer, and a second boosting transformer. The detection display unit is connected with a testing loop. The function selection pressing plate can be connected to a current-limiting resistor of the testing loop selectively. The divider resistance sampling unit includes a plurality of resistors that are connected in series mutually and are connected into a high-voltage output loop. The display unit is used for displaying a testing voltage value and a testing loop leakage current. The testing instrument is connected to a single-phase power supply and then regulator carries out processing; when the first boosting transformer is collected selectively by the change-over switch, a rectifier circuit and a filter capacitor carry out processing to output a high-voltage direct current; and when the second boosting transformer is collected selectively by the change-over switch, a high-voltage alternant current is outputted and the divider resistance sampling unit is connected. According to the invention, the field suppression performance of the excitation system of the generator can be detected and the motion reliability of the electronic jumper control loop and the over-voltage protection loop can be checked.

Description

technical field [0001] The invention relates to a tester for de-excitation and overvoltage performance applied to an excitation system and a test method thereof, belonging to the technical field of generator microcomputer excitation. Background technique [0002] The function of the generator demagnetization resistor is to quickly consume the magnetic field energy stored in the generator rotor excitation winding, and quickly decay the internal potential of the generator to close to zero, especially when the generator internal or external fault occurs, it can play a role The function of protecting the generator set or reducing the loss of the generator set failure. [0003] When the generator has short circuit at the machine end, step out, loss of excitation, non-synchronous closing and other working conditions, a high overvoltage will be induced in the rotor excitation winding. If this part of the overvoltage energy cannot be absorbed in time, it will cause damage to the in...

AI Technical Summary

Problems solved by technology

Due to the lack of test equipment in most power plants, it is impossible to detect the performance of the demagnetization resistance and the action characteristics of the rotor overvoltage protection circuit, which brings hidden dangers to the long-term safe operation of the unit

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