S&C IntelliRupter PulseCloser Manual page 59

Identical Delay Time settings should be configured in the "Testing After Initial Trip"
section for all configured tests in all the series connected devices that are set up for the
PulseFinding technique with TCC shifting. For example, if there are three configured
tests and device 1 has a Delay Time setting of 2 seconds for Test 1, 5 seconds for Test 2,
and 10 seconds for Test 3, then, devices 2 and 3 should also have Delay Times settings
of 2 seconds for Test 1, 5 seconds for Test 2, and 10 seconds for Test 3.
Also, the Test 1 Delay Time setting must be less than the Test 2 Delay Time, which
must be less than Test 3 Delay Time setting.
Follow these steps to use TCC shifting with the PulseFinding technique.
STEP 1. Configure the "Initial Trip" section for each direction of the selected General
Profile.
STEP 2. Check the PulseFinding technique check box.
STEP 3. Check the TCC Shifting check box.
STEP 4. Set the Test TCC Hold setpoint.
This setting must be shorter than the shortest Delay Time setting in the
"Testing After Initial Trip," "Overcurrent," and "IFS Element" sections. It must
also be 100 ms longer than the longest Definite Time Min. Time settings for
TCC for Test Sequence Test 1 through Test 4
For this example, faults will reinitiate after five cycles. So, the Test for
TCC Hold setting time should be a minimum of 84 ms + 100 ms, or 184 ms.
Therefore, the shortest Delay Time setting for Testing After Initial Trip must
greater than or equal to 185 ms. That also defines the longest Definite Time
Min. Time setpoint as less than or equal to 84 ms.
STEP 5. Set the Inverse Segment setpoint to "none" for each of the TCC for Test
Sequence Test-n sections.
STEP 6. Set the Definite Time Min. Time setpoint as indicated in Step 4.
STEP 7. Set the "Testing After Initial Trip," "Overcurrent," and "IFS Element "sections
making sure the Delay Time settings are set as indicated in Step 4.
Sensitive Earth
Trip on Current Spikes
When enabled, the Sensitive Earth Trip on Current Spikes setting causes the
IntelliRupter fault interrupter to trip and immediately lock out if the user-specified
number of current spikes occurs within the user-specified time period. The Current
Spike counter is incremented each time current goes above the Sensitive Earth Min
Trip value. The timer is a constant rolling window, so when no current spikes occur
within the user-specified trip within time, the Current Spike Counter element is fully
reset. The Sensitive Earth Current Spike Trip element and the Sensitive Earth
Overcurrent element can both be enabled and will operate independently of each other.
(Default: Disabled) See the Minimum Time Between SEF Current Spikes setting on
the Setup>Protection>Advanced Setup screen.
Protection Setup
S&C Instruction Sheet 766-530 59