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By Patryk Janda

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For protection schemes where the possibility of signiÞcant incorrect indication exists, special designs such as modiÞcation of zero-sequence level detectors by portions of positive sequence current may be used. Shunt reactor protection systems may also suffer from incorrect indication of unbalance currents [B7]. Some systems rely on negative or zero sequence current to indicate the presence of turn to turn faults in the reactor. When the reactor is energized, there may be large and long lasting transient dc components in the phase currents (due to the high X/R ratio of the reactor).

For the second iteration, try IE = 2 A. 4%. 6. 1 Saturation effects on electromechanical relays The performance of a relay for nonsinusoidal currents cannot be predicted without a detailed knowledge of the operating principles of the relay. Electromechanical relays operate on a value of current related to the rms value of the applied current. However, relays that develop an operating torque through internal phase-shifted ßuxes may perform differently because of different phase shifts for different component frequencies of the distorted current.

110-1996 IEEE GUIDE FOR THE APPLICATION OF CURRENT TRANSFORMERS Annex C Remanent flux in current transformers (Informative) When a fault occurs on a power system, a dc transient can occur in the current waveform depending on the point of incidence of the fault. When a dc transient occurs, the resulting ßux in the line cts increases to a level substantially higher than that caused by symmetrical currents. Usually, the fault current will be interrupted in a few cycles. The fault current duration can be much shorter than the time constant of the primary circuit.

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