1.19
Date Code 20171021 Instruction Manual SEL-421 Relay
Introduction and Specifications
Specifications
Time-Delay Accuracy: ±0.1% ±0.0042 s
Pickup Range,
Undervoltage Blocking: 20–200 V
LN
(Wye)
Pickup Accuracy,
Undervoltage Blocking: ±2% ±0.5 V
Optional RTD Elements
(Models Compatible With SEL-2600 RTD Module)
12 RTD Inputs Via SEL-2600 RTD Module and SEL-2800 Fiber-Optic
Transceiver
Monitor Ambient or Other Temperatures
PT 100, NI 100, NI 120, and CU 10 RTD-Types Supported, Field
Selectable
As long as 500 m Fiber-Optic Cable to SEL-2600 RTD Module
Breaker Failure Instantaneous Overcurrent
Setting Range
5 A Model: 0.50–50.0 A, 0.01 A steps
1 A Model: 0.10–10.0 A, 0.01 A steps
Accuracy
5 A Model: ±0.05 A plus ± 3% of setting
1 A Model: ±0.01 A plus ± 3% of setting
Transient Overreach: <5% of setting
Maximum Pickup Time: 1.5 cycles
Maximum Reset Time: 1 cycle
Timers Setting Range: 0–6000 cycles, 0.125 cycle steps
(All but BFIDOn, BFISPn)
0–1000 cycles, 0.125 cycle steps
(BFIDOn, BFISPn)
Time Delay Accuracy: 0.125 cycle plus ± 0.1% of setting
Synchronism-Check Elements
Slip Frequency
Pickup Range: 0.005–0.500 Hz, 0.001 Hz steps
Slip Frequency
Pickup Accuracy: ±0.0025 Hz plus ± 2% of setting
Close Angle Range: 3–80°, 1° steps
Close Angle Accuracy: ±3°
Load-Encroachment Detection
Setting Range
5 A Model: 0.05–64 secondary, 0.01 steps
1 A Model: 0.25–320 secondary, 0.01 steps
Forward Load Angle: –90° to +90°
Reverse Load Angle: +90° to +270°
Accuracy
Impedance
Measurement: ±3%
Angle Measurement: ±2°
Out-of-Step Elements
Blinders (R1) Parallel to the Line Angle
5 A Model: 0.05 to 70 secondary
–0.05 to –70 secondary
1 A Model: 0.25 to 350 secondary
–0.25 to –350 secondary
Blinders (X1) Perpendicular to the Line Angle
5 A Model: 0.05 to 96 secondary
–0.05 to –96 secondary
1 A Model: 0.25 to 480 secondary
–0.25 to –480 secondary
Accuracy (Steady State)
5 A Model: ±5% of setting plus ± 0.01 A for SIR
(source to line impedance ratio) < 30
±10% of setting plus ±0.01 A for
30 SIR 60
1 A Model: ±5% of setting plus ± 0.05 A for SIR
(source to line impedance ratio) < 30
±10% of setting plus ±0.05 A for
30 SIR 60
Transient Overreach: < 5% of setting plus steady-state accuracy
Positive-Sequence Overcurrent Supervision
Setting Range
5 A Model: 1.0–100.0 A, 0.01 A steps
1 A Model: 0.2–20.0 A, 0.01 A steps
Accuracy (Steady State)
5 A Model: ±3% of setting plus ± 0.05 A
1 A Model: ±3% of setting plus ± 0.01 A
Transient Overreach: <5% of setting
Bay Control
Breakers: 2 (control), 3rd indication
Disconnects (Isolators): 10 (maximum)
Timers Setting Range: 1–99999 cycles, 1-cycle steps
Time-Delay Accuracy: ±0.1% of setting, ±0.125 cycle
Timer Specifications
Breaker Failure: 0–6000 cycles, 0.125 cycle steps
(All but BFIDOn, BFISPn)
0–1000 cycles, 0.125 cycle steps
(BFIDOn, BFISPn)
Communications-Assisted
Tripping Schemes: 0.000–16000 cycles, 0.125 cycle steps
Out-of-Step Timers
OSBD, OSTD: 0.500–8000 cycles, 0.125 cycle steps
UBD: 0.500–120 cycles, 0.125 cycle steps
Pole-Open Timer: 0.000–60 cycles, 0.125 cycle steps
Recloser: 1–99999 cycles, 1 cycle steps
Switch-Onto-Fault
CLOEND, 52AEND: OFF, 0.000–16000 cycles,
0.125 cycle steps
SOTFD: 0.50–16000 cycles, 0.125 cycle steps
Synchronism-Check Timers
TCLSBK1, TCLSBK2: 1.00–30.00 cycles, 0.25 cycle steps
Zone Time Delay: 0.000–16000 cycles, 0.125 cycle steps
Station DC Battery System Monitor Specifications
Rated Voltage: 15–300 Vdc
Sampling Rate: DC1: 2 kHz
DC2: 1 kHz
Processing Rate: 1/8 cycle
Operating Time: Less than 1.5 cycles (all elements except
ac ripple)
Less than 1.5 seconds (ac ripple element)
Setting Range
15–300 Vdc, 1 Vdc steps (all elements except ac ripple)
1–300 Vac, 1 Vac steps (ac ripple element)
Accuracy
Pickup Accuracy: ±3% ±2 Vdc (all elements except ac ripple)
±10% ±2 Vac (ac ripple element)
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