System and method for testing GIS electronic transformer

Abstract

The invention discloses a system for testing a GIS electronic transformer based on a small connecting and disconnecting capacity current of a disconnecting switch. The system comprises a high-voltage testing transformer connected to a BSG sleeve, a capacitive voltage divider, a load capacitor arranged on the other BSG sleeve, the disconnecting switch arranged between the two sleeves, a calibration primary transient state testing system and the electronic transformer to be tested, one end of a secondary converter is connected with the electronic transformer to be tested, the other end of the secondary converter is connected with a merging unit, and the other end of the merging unit is connected with a fault recorder. When the disconnecting switch is connected or disconnected, voltage values and current values of a high-voltage bus are tested and compared with the output values of the electronic transformer to be tested. According to the testing system, the electromagnetic environment at the voltage levels of 110KV, 220KV, 500KV and the like in the process of electricity connection and electricity disconnection can be simulated, the site disconnecting switch connecting and disconnecting hollow conducting wire and capacity small current loading process is simulated, similar site transient sate strong-interference is generated, and the electromagnetic protective performance of the electronic transformer under the condition is examined.

Description

technical field [0001] The invention relates to a GIS electronic transformer testing system and a method thereof, in particular to a GIS electronic transformer testing system and a testing method based on an isolating switch for separating and closing capacitive small currents. Background technique [0002] With the construction of the smart grid, electronic transformers are widely used in the smart grid. The strategic goal of "building a unified and strong smart grid" proposed by the State Grid Corporation of China's scientific and technological development plan has put forward higher requirements for the quality and performance of electronic transformer products, and the reliability, stability and accuracy of product operation. Among them, electromagnetic interference is an important factor affecting the reliability and stability of electronic transformers. [0003] At present, the detection understanding of EMC of electronic transformers at home and abroad is still based...

AI Technical Summary

Problems solved by technology

[0004] From the types and characteristics of common electromagnetic interference in substations and its interference coupling path to electronic transformers, it can be seen that in the substation environment, the reason why electronic transformers are susceptible to interference is mainly because their equipment is closer to the primary circuit. , Under the condition of system short circuit, it is more susceptible to interference through direct conduction and electromagnetic field coupling, and its layout, merging unit and its power supply module are also very easy to cause interference through electromagnetic radiation or ground potential rise

The intensity of these interferences far exceeds the interference level specified in the current electromagnetic compatibility standards, which is also the main reason why the electronic transformer has passed the electromagnetic compatibility test and the electromagnetic protection failure occurs on site.

Images