Field test system and method for excitation device

Abstract

A system and method for an on-site test of an excitation device. The system comprises an excitation device, wherein the excitation device comprises an AI interface, a DI interface, an AO interface and an AI debugging interface. It is characterized in that the system also comprises an interface box connected to the AI interface of the excitation device. The interface box comprises an interface terminal and a signal conditioning module which are connected to an external signal required to be coordinated. The signal conditioning module processes the external signal required to be coordinated and converts same into a signal which can be directly received by the AI interface. The AO interface is connected with the AI debugging interface via a soft switch. The system not only makes full use of the existing capability of the excitation device, but also simplifies wiring and test operations, so that analogue quantity and on-off quantity signals can be compatible at the same time, thereby realizing flexible configuration of input channels, and reducing requirements and test risks for on-site overhaul personnel. The present invention facilitates the early discovery of a possible hidden danger of a loop related to excitation, thus improving the overall reliability of the excitation device.

Description

technical field [0001] The invention relates to a field test system and method for an excitation device. Background technique [0002] The "Evaluation Standards for Grid-connected Safety of Generator Sets" stipulates that "the excitation system newly put into operation or after overhaul should be subjected to disturbance tests such as load shedding, step, zero-start voltage boost, and de-excitation according to national and industry standards. It should be able to reliably demagnetize the generator under various working conditions." Among them, in order to ensure the rapidity and reliability of demagnetization for large-scale units, the logic of the demagnetization circuit is often more complicated, and the timing requirements are stricter. In order to verify whether the demagnetization circuit meets the design requirements, it is necessary to measure dry nodes, low-voltage pulses, and high-voltage DC voltage at the same time. and other types of multi-channel signals. Howe...

AI Technical Summary

Problems solved by technology

However, the user lacks a special debugging system for testing the de-excitation logic. The on-site test is very cumbersome and requires high requirements for the test personnel; when the excitation device is performing a functional simulation test, it needs to be connected to an external protection calibrator and other special equipment to input analog signals. It needs to be carried out step by step according to the operation steps. During the test, it is necessary to record data and record waveforms. After the test is completed, it is necessary to write a test report. It is easy to miss steps or data. These are difficult to meet the needs of modern power plants; in the no-load characteristics of generators When testing the short-circuit characteristics and short-circuit characteristics, it is necessary to connect a special instrument on the side of the excitation device to record data and store waveforms of the required machine terminal voltage and current, rotor voltage and current, and other signal quantities. The external wiring includes AC signals and DC signals of voltage and current. , on-site wiring is more troublesome

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