Voltage transformer errors on the impact of distance protection

Current and voltage transformer error on the impact of distance protection, indicating current and voltage transformer protective impedance error will cause the distance  air circuit breaker  accuracy decreased, resulting in shortening of protected areas and other issues. On this basis, summed up the traditional solution saturation current transformer errors and basic methods, such as increasing the transformer ratio, reducing the current transformer secondary load, using the phase comparison principle, increasing the data windows. However, due to the traditional  electric meter  current transformer inherent defects, it is difficult to eradicate from the principle of protection of its lines caused problems. With the computer, optical fiber technology, emerging electronic current transformer is a set of electronics and optical technology as one of the new optical  Air circuit breaker , its precision, high reliability, wide bandwidth, non-magnetic saturation, anti-interference ability and other characteristics, the decision that it will gradually become the traditional electromagnetic current transformer alternatives. Therefore, this paper presents the use of electronic current transformers as a distance measuring element protection proposals demonstrated using optical current transformer on Distance Protection starter components, phase selector, impedance components and other functional elements also brings advantages. Analysis showed that the electronic current transformers distance protection will greatly enhance the accuracy and operation of each component reliability.