1.12
SEL-351A Relay Instruction Manual Date Code 20080213
Introduction and Specifications
Specifications
1 A nominal IN
channel:
0.050–20.000 A, 0.001 A steps
(neutral ground)
0.2 A nominal IN
channel:
0.005–2.500 A, 0.001 A steps (neutral
ground)
0.05 A nominal IN
channel:
0.005–1.500 A, 0.001 A steps (neutral
ground)
Steady-State Pickup Accuracy
5 A Model: ±0.05 A, ±3%
1 A Model: ±0.01 A, ±3%
0.2 A IN Model: ±0.001 A, ±3%
0.05 A IN Model: ±0.001 A, ±5%
Transient Overreach: ±5% of pickup
Time Delay: 0.00–16,000.00 cycles,
0.25–cycle steps
Timer Accuracy: ±0.25 cycle, ±0.1%
Time Overcurrent Elements (51)
Current Pickup (A secondary)
5 A nominal phase
channels:
0.25–16.00 A, 0.01 A steps (phase &
negative-sequence)
0.10–16.00 A, 0.01 A steps (residual
ground)
1 A nominal phase
channels:
0.05–3.20 A, 0.01 A steps (phase &
negative-sequence)
0.02–3.20 A, 0.01 A steps (residual
ground)
5 A nominal IN
channel:
0.500–16.000 A, 0.005 A steps
(neutral ground)
1 A nominal IN
channel:
0.100–3.200 A, 0.001 A steps (neutral
ground)
0.2 A nominal IN
channel:
0.005–0.640 A, 0.001 A steps (neutral
ground)
0.05 A nominal IN
channel:
0.005–0.160 A, 0.001 A steps (neutral
ground)
Pickup Accuracy
5 A Model: ±0.05 A, ±3%
1 A Model: ±0.01 A, ±3%
0.2 A IN Model: ±0.005 A, ±3%
0.05 A IN Model: ±0.001 A, ±5%
Time Dials: ±5% of pickup
US: 0.5–15.0, 0.01 steps
IEC: 0.05–1.00, 0.01 steps
Timing: ±1.50 cycles, ±4% between 2 and 30
multiples of pickup
0.05 A IN Model: ± 3.50 cycles, ±4% between 2 and 30
multiples of pickup
Under- (27)/Overvoltage (59) Elements
Pickup Ranges: 0.00–300.00 V, 0.01 V steps
(most elements)
Steady-State
Pickup Accuracy: ± 0.5 V, ±1% for 12.5–300.00 V
Transient Overreach: ±5%
Under-/Overfrequency Elements (81)
Frequency: 40.1–65.00 Hz, 0.01 Hz steps
Time Delays: 2.00–16,000.00 cycles, 0.25-cycle steps
Timer Accuracy: ±0.25 cycle, ±0.1%
Steady-State plus
Transient Overshoot: ±0.01 Hz
Undervoltage Frequency
Element Block Range: 25.00–300.00 V
SELOGIC Control Equation Variable Timers
Pickup Ranges
0.00–999,999.00
cycles:
0.25-cycle steps (reclosing relay and
some programmable timers)
0.00–16,000.00 cycles: 0.25-cycle steps (some programmable
and other timers)
Pickup/Dropout
Accuracy: ± 0.25 cycle, ±0.1%
Substation Battery Voltage Monitor (Not in SEL-351A-1)
Pickup Ranges: 20–300 Vdc, 1 Vdc steps
Measuring Accuracy: ±2%, ±2 Vdc
Metering Accuracy
Accuracies specified at 20°C and at nominal system frequency
unless otherwise noted.
Voltages
V
A
, V
B
, V
C
: ±0.2% (67.0–300 V; wye-connected)
V
AB
, V
BC
, V
CA
: ± 0.4% (67.0–300 V; delta-connected)
V
S
: ±0.2% (67.0–300 V)
V
1
, V
2
, 3V
0
*: ±0.6% (67.0–300 V)
* not available when delta-connected
Currents I
A
, I
B
, I
C
5 A Nominal: ±2 mA, ±0.1% (0.5–100.0 A)
1 A Nominal: ±0.5 mA, ±0.1% (0.1–20 A)
Currents I
N
, I
1
, 3I
0
, 3I
2
5 A Nominal: ±0.05 A, ±3% (0.5–100.0 A)
1 A Nominal: ±0.01 A, ±3% (0.1–20.0 A)
Currents I
N
0.2 A IN Nominal: ±0.08 mA, ±0.1% (0.005–4.5 A)
0.05 A IN Nominal: ±1 mA, ±5% (0.01–1.5 A)
Temperature Coefficient: [(0.0002%)/(°C)
2
] • (__°C–20°C)
2
(see example below)
Phase Angle Accuracy: ±0.5°
MW/MVAR (A, B, C {wye connected only} and 3-phase;
5 A nominal accuracy (MW / MVAR) at load angle for
0.5 A ≤ phase current < 1.0 A:
0.70% / – 0° or 180° (unity power factor)
0.75% / 6.50% ±8° or ±172°
1.00% / 2.00% ±30° or ±150°
1.50% / 1.50% ±45° or ±135°
2.00% / 1.00% ±60° or ±120°
6.50% / 0.75% ±82° or ±98°
– / 0.70% ±90° (power factor = 0)
for phase current ≥ 1.0 A:
0.35% / – 0° or 180° (unity power factor)
0.40% / 6.00% ±8 or ±172°
0.75% / 1.50% ±30° or ±150°
1.00% / 1.00% ±45° or ±135°
1.50% / 0.75% ±60° or ±120°
Courtesy of NationalSwitchgear.com
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