U.1.17
Date Code 20090715 User’s Guide SEL-421 Relay
Introduction and Specifications
Specifications
Sensitivity
5 A Model: 0.5 A secondary
1 A Model: 0.1 A secondary
(Minimum sensitivity is controlled
by the pickup of the supervising
phase and residual overcurrent
elements for each zone.)
Accuracy (Steady State): ±3% of setting at line angle for SIR
<30
±5% of setting at line angle for
30 ≤SIR ≤ 60
Transient Overreach: <5% of setting plus steady-state
accuracy
Instantaneous/Definite-Time Overcurrent Elements
Phase, Residual Ground, and Negative-Sequence
Pickup Range
5 A Model: OFF, 0.25–100.00 A secondary,
0.01 A steps
1 A Model: OFF, 0.05–20.00 A secondary,
0.01 A steps
Accuracy (Steady State)
5 A Model: ±0.05 A plus ±3% of setting
1 A Model: ±0.01 A plus ±3% of setting
Transient Overreach: <5% of pickup
Time Delay: 0.00–16000.00 cycles,
0.125 cycle steps
Timer Accuracy: ±0.125 cycle plus ±0.1% of setting
Maximum
Operating Time: 1.5 cycles
Time-Overcurrent Elements
Pickup Range
5 A Model: 0.25–16.00 A secondary, 0.01 A steps
1 A Model: 0.05–3.20 A secondary, 0.01 A steps
Accuracy (Steady State)
5 A Model: ±0.05 A plus ±3% of setting
1 A Model: ±0.01 A plus ±3% of setting
Time Dial Range
US: 0.50–15.00, 0.01 steps
IEC: 0.05–1.00, 0.01 steps
Curve Timing Accuracy: ±1.50 cycles plus ±4% of curve time
(for current between 2 and 30
multiples of pickup)
Reset: 1 power cycle or Electromechanical
Reset Emulation time
Ground Directional Elements
Neg.-Seq. Directional Impedance Threshold (Z2F, Z2R)
5 A Model: –64 to 64 Ω
1 A Model: –320 to 320 Ω
Zero-Seq. Directional Impedance Threshold (Z0F, Z0R)
5 A Model: –64 to 64 Ω
1 A Model: –320 to 320 Ω
Supervisory Overcurrent Pickup 50FP, 50RP
5 A Model: 0.25 to 5.00 A 3I0 secondary
0.25 to 5.00 A 3I2 secondary
1 A Model: 0.05 to 1.00 A 3I0 secondary
0.05 to 1.00 A 3I2 secondary
Undervoltage and Overvoltage Elements
Pickup Ranges: Phase elements: 1–200 V secondary,
1 V steps
Phase-to-Phase
Elements: 1.0–300.0 V secondary, 0.1 V steps
Accuracy (Steady State): ±1 V plus ±5% of setting
Transient Overreach: <5% of pickup
Optional RTD Elements
(Models Compatible With SEL-2600A 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
Up to 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 Ω secondary, 0.01 Ω steps
1 A Model: 0.25–320 Ω secondary, 0.01 Ω steps
Forward Load Angle: –90° to +90°
Reverse Load Angle: +90° to +270°
Accuracy
Impedance
Measurement: ±3%
Angle Measurement: ±2°
Courtesy of NationalSwitchgear.com
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