Chen Kun, Li Chao
HIMALAYAL - SHANGHAI - CHINA
Abstract: Whether the turn ratio of current transformer is correct has a direct impact on electricity measurement and protection accuracy while the capacitive current transformer is extensively applied to measure and protect the substation system and equipment. This paper presents the application of three-phase turn ratio & group tester to test the capacitive voltage transformer and illustrates the problems which occur in the on-site measurement and its solutions.
Key words: Three-phase transformer ratio, capacitive voltage transformer
The voltage transformer can be classified into two categories according to its structure, working principle and application: EVT and CVT. The full name of EVT is electromagnetic voltage transformer, working principle of which is the same as transformer. Its basic structure is composed of iron core, primary winding and secondary winding. This type of transformer has small capacity and is very constant. When running normally, it is close to no-load condition.
HIMALAYAL provides innovative products that comprise high voltage test equipment, full-set high voltage test instruments, on-site test systems and on-line monitoring systems, and services regarding tests, diagnostics and asset monitoring for clients in power industry. We help to ensure safety and reliability in the power generation, transmission and distribution.