Current transformers for transient error performance requirements are needed for quick action to protect

In the power system , transformer is the most important measurement and protection equipment. In the low voltage grid, aperiodic component of short-circuit current decay fast, short-circuit current quickly reaches a steady state , so the use of general protective current transformers to meet the requirements . In UHV power system short-circuit current cyclical component of a longer decay time , asking for  Electric transformer  fault for a short time , then the current transformer in the transition state, so you must use protective current transformers for transient .  air circuit breaker  for transient error performance requirements for fast protection action is required to prevent the development of grid instability fault current transformer transient error is a direct manifestation of this transient performance . Most electronic current transformer  Voltage stabilizer or principles of optics , which has no core , no magnetic saturation , frequency bandwidth and dynamic measurement range, measurement accuracy , the measurement within the scope of protection is completely linear transfer good performance . Characterization of transient protection electronic transformers for transient error characteristics of accuracy class of TPE, is defined as the precise limits , rated primary time constant and the maximum rated operating cycle peak instantaneous error is 10%.