Site testing system and method for excitation device

Abstract

The invention discloses a site testing system and method for an excitation device. The site testing system comprises the excitation device which comprises an AI interface, a DI interface, an AO interface and an AI debugging interface. The site testing system is characterized by further comprising an interface box which is connected with the AI interface of the excitation device; the interface box comprises an interface terminal and a signal conditioning module, wherein the interface terminal and the signal conditioning module are connected with external signals needing conditioning, the signal conditioning module processes the external signals needing conditioning and converts the external signals needing conditioning into signals which can be directly received by the AI interface, and the AO interface is connected with the AI debugging interface through a soft switch. Existing capacity of the excitation device is fully utilized, wiring and test operation is simplified, analog quantity signals and switching value signals can be compatible at the same time, an input channel can be flexibly configured, the requirements for site overhaul staff and testing risks are lowered, possible hidden dangers of loops relevant to excitation can be conveniently found out as soon as possible, and therefore whole reliability of the excitation device is improved.

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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