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5 for schemes 1 and 5S. 9 to 1. This same ratio holds for fault current less than maximum. 95 A. The ratio for this relay is 24 to 1. 95 A. 78 to 1. 4. For problems associated with voltage transformer grounding on GFNs scheme 6, see [B36] . 101-1993 Annex B Ground protection example to determine the percent coverage of a highimpedance differential relay (Informative) The example below illustrates a procedure used to determine the percent coverage of a high-impedance differential relay. 085 MVA is protected using high-impedance differential relays connected per figure 18a.

S) Device 87H. This is a high-impedance phase or ground differential relay: whose sensitivity is independent of the load current and requires no coordination with external relays and devices. t) Device 87N. This is basically a sensitive, short-time, product-type time overcurrent relay with two coils—an operating coil and a polarizing coil. The relay operates when the current in the two coils have the proper relative phase angle, and the magnitude of the product of the current in the two coils exceeds the pickup setting.

And Johnson, A. , “Y-Connected Potential Transformers as Generator Neutral Grounding Devices,” IEEE Transactions on Power Apparatus and Systems, vol. 73, pp. /Feb. 1954. [B26] Brown, P. , Johnson, I. , and Stevenson, J. , “Generator Neutral Grounding. Some Aspects of Application for Distribution Transformer with Secondary Resistor and Resonant Types,” IEEE Transaction on Power Apparatus and Systems, vol. 97, no. 3, pp. 683-694, May/Jun. 1978. [B27] Johnson, A. , “Generator Grounding,” Electric Light and Power, Mar.

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