Detection system and detection method of mixed current transformer

Abstract

The invention provides a detection system of a mixed current transformer. A low-voltage side, a medium-voltage side and a high-voltage side of a transformer physical simulation unit of the system arerespectively connected with a load physical simulation unit, an infinite system physical simulation unit and one end of a busbar through three of current transformer physical simulation units constituting a current transformer physical simulation unit group. The other end of the busbar is connected with an equivalent generator set physical simulation unit and a transmission line physical simulation unit respectively through another two current transformer physical simulation units in the current transformer physical simulation unit group. The detection system of the mixed current transformer provided by the invention is equivalent to an actual system, can simulate a mixed operation mode and operation characteristics of the mixed current transformer in the actual system, and can improve thereliability and sensitivity of differential protection actions.

Description

technical field [0001] The invention relates to a detection system and a detection method of a current transformer, in particular to a detection system and a detection method of a hybrid current transformer. Background technique [0002] In order to reduce the impact of current transformer unbalanced current on differential protection and improve the reliability and sensitivity of differential protection action, not only should a single current transformer meet the requirements of the transmission system, but also the current mutual inductance of each side of the transmission system should be considered. The characteristics of the device and the mutual cooperation. "Eighteen Major Power Grid Anti-Accident Measures of the State Grid Corporation" stipulates that the relevant characteristics of the current transformers on each side of the differential protection of the main equipment should be consistent, so as to avoid the transient characteristics of the current transformers ...

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Problems solved by technology

"Eighteen Major Power Grid Anti-Accident Measures of the State Grid Corporation" stipulates that the relevant characteristics of the current transformers on each side of the differential protection of the main equipment should be consistent, so as to avoid the transient characteristics of the current transformers on each side when encountering a large short-circuit current. Inconsistencies lead to incorrect action of protection

However, in the process of substation expansion and transformation, in order to reduce the amount of engineering and reduce costs, the characteristics of the current transformers for differential protection are actually difficult to be completely consistent, and it is often the case that different types of current transformers are operated in parallel.

In line longitudinal protection, busbar differential protection, and transformer differential protection, the mixed use of conventional transformers and electronic transformers will lead to misoperation of differential protection, reduce the reliability and sensitivity of differential protection operations, and affect power transmission. normal operation of the system

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