Schweitzer Engineering Laboratories SEL-352-1 - Relay Element Specifications

1-10 Introduction and Specifications Date Code 20010731
SEL-352-1, -2 Instruction Manual
Certifications: ISO: Relay is designed and manufactured using ISO-9001 certified quality program.
Processing
Specifications:
64 samples per power system cycle.
RELAY ELEMENT SPECIFICATIONS
Overcurrent Elements
50FT Fault Current Element with Subsidence Current Logic
setting ranges ................................................0.50–45.00 A secondary, 0.01-A steps (I
nom
= 5 A)
........................................................................0.10–9.00 A secondary, 0.01-A steps (I
nom
= 1 A)
pickup time............................................................. less than 0.55 cycle at 2 multiples of pickup
dropout time..................................................................................................less than 0.75 cycle
pickup and dropout...............................................................±0.025 A secondary ±5% of setting
transient overreach ............................................................................................. ±14% of setting
50MD/50LD MOD and Load/Line Current Elements
setting ranges ................................................0.10–45.00 A secondary, 0.01-A steps (I
nom
= 5 A)
........................................................................0.02–9.00 A secondary, 0.01-A steps (I
nom
= 1 A)
pickup time............................................................... less than 0.9 cycle at 2 multiples of pickup
dropout time................................................................................................ less than 1.35 cycles
pickup and dropout...............................................................±0.025 A secondary ±5% of setting
transient overreach ............................................................................................... ±5% of setting
50MN Minimum Current Element
current threshold (fixed)................................................................ 0.10 A secondary (I
nom
= 5 A)
...................................................................................................... 0.02 A secondary (I
nom
= 1 A)
pickup time............................................................... less than 0.9 cycle at 2 multiples of pickup
dropout time................................................................................................ less than 1.35 cycles
pickup and dropout.........................................................................................±0.03 A secondary
transient overreach ............................................................................................... ±5% of setting
50N Ground Overcurrent Element
setting ranges ................................................0.10–45.00 A secondary, 0.01-A steps (I
nom
= 5 A)
........................................................................0.02–9.00 A secondary, 0.01-A steps (I
nom
= 1 A)
pickup time............................................................... less than 0.9 cycle at 2 multiples of pickup
dropout time................................................................................................ less than 1.35 cycles
pickup and dropout...............................................................±0.025 A secondary ±5% of setting
transient overreach ............................................................................................... ±5% of setting
50RMS RMS Overcurrent Element.......................................... (Only available in the SEL-352-2 Relay)
setting ranges ................................................0.50–45.00 A secondary, 0.10-A steps (I
nom
= 5 A)
........................................................................0.10–9.00 A secondary, 0.02-A steps (I
nom
= 1 A)
pickup time............................................................... less than 0.9 cycle at 2 multiples of pickup
dropout time .............................................................................................. less than 1.125 cycles
pickup and dropout...........................................................±0.01
¼I
nom
A secondary ±5% of setting
transient overreach ............................................................................................... ±5% of setting