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2 CALCULATION OF SETTINGS
1201: PICKSCHEME - Select Scheme Logic
Any one of the following schemes can be selected:
1. STEPDST - Step Distance
2. PUTT - Permissive Underreaching Transfer Trip
3. POTT1 - Permissive Overreaching Transfer Trip (uses traditional transient blocking for current reversals)
4. POTT2 - Permissive Overreaching Transfer Trip (uses blocking functions to establish transient blocking)
5. HYBRID - Hybrid Scheme (uses channel repeat circuitry and weak infeed tripping if desired)
6. BLOCK - A directional comparison Blocking scheme
Set PICKSCHEME to the desired scheme.
1202: NUMRCVR - Select Number Of Receivers
Set NUMRCVR equal to the number of receivers to be used with the selected scheme.
1203: TRIPMODE - Select 1-Phase / 3-Phase Trip Mode (Single Phase Tripping model only)
Any one of the following modes of tripping can be selected:
1. 3POLE -with this selection, three phase tripping will be initiated for all faults regardless of the fault type
2. 1POLE -with this selection, single phase tripping will be initiated for single line to ground faults and three-
pole tripping will be initiated for all multi-phase faults
3. 1POLEZ2 - with this selection, tripping will be the same as with the 1POLE setting with the additional fea-
ture that single phase tripping will also be initiated for Zone 2 time delayed single-line-to-ground faults
1204: CARRSTART - Function to Start Carrier in BLOCKING Scheme
This setting determines the function that will be used to start carrier (in addition to the phase and ground dis-
tance blocking functions) when a BLOCKING scheme is selected. Any one of the following can be selected:
1. DIR - with this selection, carrier will be started by the operation of the NB and IPB functions.
2. IPB - with this selection carrier will be started by the operation of the IPB function.
3. FD - with this selection will be started by the operation of the fault detector (FD) function.
1205: WKINFTRIP - Select Weak Infeed Tripping in HYBRID Scheme
This setting determines if the Weak Infeed Trip logic will be used when a HYBRID scheme is selected. One of
the following can be selected:
1. YES - with this selection, the Weak Infeed Tripping logic is enabled.
2. NO - with this selection, the Weak Infeed Tripping logic is disabled, but the Channel Repeat (Echo) logic
remains in service.
GE Power Management
LPS-D Line Protection System
2.3 PROTECTION SETTINGS
2.3.13 SCHEME
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