Download IEEE Std C37.110-1996 Guide for the Application of Current 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

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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.

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