Transient sampling pre-unit for transient testing of electronic transformer and merging unit

Abstract

The invention provides a transient sampling pre-unit for transient testing of an electronic transformer and a merging unit. The transient sampling pre-unit is composed of a precision current converter, a signal processing circuit, a synchronous AD converter, a constant-temperature crystal oscillator and an FPGA (field-programmable gate array). The signal processing circuit comprises is used for performing signal conditioning on a standard source transient current signal converted by the precision current converter, signal conditioning on the transient low voltage signal of the standard source and signal conditioning on the low voltage signal of an electronic transformer test object; the three signals conditioned are sent into the synchronous AD converter; the synchronous AD converter is connected with the FPGA and outputs signals via an optical fiber serial transmitter. The transient sampling pre-unit has the characteristics of high-speed sampling, high testing precision, good saturation characteristic, good real-time testing property, excellent anti-interference performance, good safety and the like. The transient sampling pre-unit is capable of accurately testing the transient precision of the digital quantity transmitted by the merging unit based on discrete data and providing detection basis for large-area promotion of intelligent substations.

Description

technical field [0001] The invention relates to an electronic transformer and a transient sampling pre-unit for the transient test of an merging unit, belonging to the technical field of electric power metering and testing. Background technique [0002] At present, the development of smart substations and digital substations has entered the stage of large-scale engineering applications. With the extensive application of electronic transformers, traditional transformers + merging unit models, the merging unit will officially become smart equipment for smart substations and digital substations. With the release of State Grid Corporation of China Q / GDW 441-2010 "Technical Specifications for Relay Protection of Smart Substations", the characteristic test of the merging unit has become extremely important. At present, the domestic merging unit is mainly tested at the steady state level, even the transient test is basically based on the transient process test of small curren...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the test requirements of intelligent substations and digital substations on the merging unit and the transient transmission characteristics of electronic transformers in transient conditions, and aim at the existing electronic transformers and merging units. Based on the current technical status of the application, the transient pre-unit for the transient test of the electronic transformer and the merging unit has been developed to meet the transient transmission characteristics of the merging unit tester for the electronic transformer and the merging unit of the smart substation under fault conditions test

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