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Figure 48. The Setup>Protection>General Profile 1>Direction 1 Current>Testing After Initial

Trip>Sensitive Fault Protection Elements screen.

Three-Phase Trip for Multiple Phase Faults

When set to the Yes option and the second faulted pole reaches at least 20% of the

milestone (or trip sequence) before the rst faulted pole reaches the Overcurrent Trip

state, the IntelliRupter fault interrupter will trip all three phases for the present Test

operation and all subsequent Test operations. When set to the No option, each phase

will trip independently.

Retain Source Side for Test Sequence

Select the No option to allow the IntelliRupter fault interrupter to respond to faults

in both directions at any time. Select the Yes option to restrict circuit testing for the

rest of the test sequence to the fault direction identied by the Initial Trip operation.

Simultaneous bi-directional overcurrent protection is maintained for the Initial Trip

operation for either option. The No option is the default and recommended option for

general applications.

This feature prevents backfeeding a substation caused by a restoration event return-

ing voltage from the opposite side. When set to the Yes option, the source side is deter-

mined at the time of the Initial Trip operation and is the side that is not faulted. If the

Directionality element determines the fault is on the Direction 1 terminals, then the

Direction 2 terminals are the source side for the duration of the test sequence. If direc-

tionality cannot be determined, the test sequence is ended and goes to the Lockout state.

If source-side voltage is not present for the duration of the Test Sequence or Pulse

Finding Loss-of-Source Timeout Timer, the IntelliRupter fault interrupter goes to

the Lockout state.

Single-Phase Current Restraint, Phase

Specify a phase current above which a Single-Phase Trip operation will not be allowed,

and all Trip operations will be performed three-phase. (Range: 10-800; Step: 1 amp;

Default: None)

Single-Phase Current Restraint, Ground

Specify a ground current above which a Single-Phase Trip operation will not be

allowed and all Trip operations will be performed three-phase. (Range: 10-800;

Step: 1 amp; Default: None)

Sensitive Earth Fault Protection Elements

The SEF element will always trip three-phase and will always close after each time delay

preceding an SEF trip. See Figure 48.

76 S&C Instruction Sheet 766-530

Protection Setup

S&C IntelliRupter PulseCloser User Manual

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