I.L. 40-386.3
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1. 2. REL 301/302 FEATURES
1.2.1 Standard Features for REL 301 (Non-Pilot)
• 3-Zone distance phase and ground relay, with reversible Zone3 phase and ground;
4 impedance units per zone: 3 phase-to-ground; 1 phase-to-phase.
• T1 timer (0 to 15 cycles)
• Independent timers for phase and ground
• Overcurrent supervision of phase and ground distance
• Selectable Zone2 torque controlled overcurrent (phase or ground)
• Inverse time directional or non-directional (selectable) overcurrent ground backup
logic
• Loss of potential supervision
• Loss of current monitoring
• Instantaneous forward directional phase and ground high set overcurrent trip
• Close Into Fault Trip
• Unequal-pole-closing load pickup logic
• Selectable Loss-of-Load accelerated trip logic
• Selectable Zone1 extension
• Current change fault detector (∆I)
• Voltage change fault detector (∆V)
• Fault data can be re-accessed by moving down to the Last Fault or Previous Fault
display mode
• Line voltage, current and phase angle monitoring
• Selectable polarizing for directional overcurrent ground units (zero sequence, nega-
tive sequence and dual
• Programmable Reclose initiation and reclose block outputs
• 100% Numerical processing
• Fault location capability
• Self-checking software
• Breaker trip circuit test
• Push-to-close test for output contacts
• Binary input test of contact input circuits
• Software switches for functional tests, e.g., (Carrier Send and Carrier Receivers)
• Trip contact sealed in by trip current, and selectable dropout delay of 0 or 50 ms
• 16 fault records with setting selectable data capture choices which trigger fault re-
cording
• Real-time clock
• Low voltage pickup setting for weakfeed logic and close into fault trip
• Setting positive sequence to zero sequence ratio
• Double blinder logic for out of step blocking
• RS-232C PONI or INCOM/PONI
• 16 sets of oscillographic data and intermediate target data. Each set includes 7 an-
alog graphic inputs and 24 digital. Each oscillographic target contains 1 prefault
and 7 fault cycles of data. Data collection can be started by TRIP, Z2 and trip, Z2Z3
and trip or ∆V ∆I
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