©2015 Siemens Protection Devices Limited
Chapter 7 Page 18 of 64
2.1.5.1
Example 1 – Further Analysis
Having established settings to ensure stability under load, transient and external fault conditions the following
considers the operating levels for internal faults. The ‘fault setting’ for internal fault conditions is affected by the
ICT Multiplier
and
ICT Connection
settings applied:
W1 Internal Earth Fault
Figure 2-7: Relay Currents - Star Winding Internal Earth
Notes
A- E fault causes current to flow in the A and C elements
The Yd ICT connection reduces current flow by a factor of 1/ 3
Relay may indicate A and C faults
Summary of Contents for 7SR242 Duobias
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