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If you have a phase to phase fault, the voltages of the two faulted phases get pulled together Even with the fault, the network is still symmetric. In a single line to ground fault, the voltages magnitudes and angles, with respect to ground change.
Draw the sequence networks for the following power system It is a symmetrical one Assume the generator is operating at rated voltage
Reduce the sequence networks to their thévenin equivalents for a fault occurring half of the way along the transmission line.
If a phase a or c ground fault occurs, the relay voltage increases by about 1.73 v to cause the relay to operate on overvoltage Either undervoltage or overvoltage operation usually sets off an alarm to alert the operators of a ground fault so that they can arrange an orderly or convenient shutdown. Power system protection devices, such as circuit breakers, rely on phase information to determine the type of fault and take appropriate action The change in phase angle can help the protection system identify the fault and quickly isolate the fault area.
Assume the fault current for a phase to phase fault on the delta side to be 3pu The relative current magnitudes on the various phases on the wye side are shown in the figure below. A novel realizable and effective method of faulty phase selection based on transient current similarity measurements is presented when spgs occur in resonantly grounded distribution systems in this paper. We will develop connections between the sequence networks for each fault type and apply them to our example
A three phase fault has all three phases connected to each other and to ground
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