Read Online or Download IEEE Std C37.110-1996 Guide for the Application of Current Transformers Used for Protective Relaying Purposes PDF
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Additional resources for IEEE Std C37.110-1996 Guide for the Application of Current Transformers Used for Protective Relaying Purposes
With the higher fault current supplied by the larger transformer, the cts on the distribution breakers may saturate for feeder faults. 110-1996 Figure 12ÑNondirectional phase and ground overcurrent relays Assume a worst case condition such as a close-in line-to-ground fault on a distribution feeder and an inÞnite system source behind the transformer. 8 kV. From table 1, the effective ct burden seen by the feeder breaker's cts for a line-to-ground fault is Z = RS + 2RL + ZR. 50 = 149 V If the feeder breaker cts are rated C200 with a knee point of about 100 V then they will saturate, produce distorted secondary current, and therefore, cause slower operation of the feeder electromechanical overcurrent relay.
13-1993 classiÞes protection cts with a speciÞed secondary terminal voltage across a standard impedance (Zb). 4 for details). For example, a ct with ANSI accuracy classiÞcation T400 would be classiÞed in IEC terminology as a 100 VA, Class 10P20 ct, because V acr 400 Z b = ---------- = --------- = 4 W 20I n 100 where Sb 10 P 20 is Zb ´ In2 = 100 VA is the percentage composite error limit deÞnes the ct as a protection ct is the accuracy limit factor The standard IEC values for the error limit are 5 or 10.
B2] Blackburn, J. , "Ground Relay Polarization," AIEE Transactions, vol. 71, Part III, pp. 1088Ð1093, Dec. 1952. [B3] Blackburn, J. , Chapters 5 and 8, 1987. [B4] Conner, E. , Wentz, E. , and Allen, D. , "Methods for Estimating Transient Performance of Practical Current Transformers For Relaying," IEEE Transactions on Power Apparatus and Systems, vol. 1, pp. /Feb. 1975. [B5] Douglas, D. , "Current Transformer Accuracy with Asymmetric and High Frequency Fault Currents," IEEE Transactions on Power Apparatus and Systems, vol.