GE MIFII GEK-106237P, Instruction Manual

Page: 32 / 245

GEK-106237P MIFII Digital Feeder Relay 2-13
2 PRODUCT DESCRIPTION 2.7 COLD LOAD PICKUP (AVAILABLE ONLY IN OPTION 2 MODELS)
2
2.7COLD LOAD PICKUP (AVAILABLE ONLY IN OPTION 2 MODELS)
This element avoids undesired operation of the overcurrent elements in case of high currents produced when energizing a
line that has been open for a long period of time.
This element detects when the current values of the three phases are lower than 4% of the rated current (In). In this
moment, a timer (T IN) is started.
If the currents return to values above 4% In before the timer has timed out, the unit returns to its original status.
When the timer has timed out, the tap settings of the instantaneous phase elements (50P1 and 50P2) are multiplied by a
constant K50P, and the phase TOC (51P) tap settings are multiplied by a constant K51P. A status signal turns on indicating
that the Cold Load Pickup is enabled, and the corresponding event is generated.
For exiting the CLP status, when the current values of the three phases are above 8% In, a T OUT timer is started.
If the current values fall below 8%In before the timer countdown has finished, the unit remains in CLP status.
If the timeout finishes and current values are still above 8%In, the CLP status is disabled and the relay returns to its original
settings. The CLP status signal is deactivated, and the corresponding event is generated.
The T IN and T OUT timer values, as well as the multiplying constants K50P and K51P, and the function permission are
settings associated to the COLD LOAD PICKUP. These settings are included in the ADVANCED SETTINGS group. They
will be described in detail in the SETTINGS section.