Sel SEL-351S - Page 35

1.13
Date Code 20080103 Instruction Manual SEL-351S Relay
Introduction and Specifications
Specifications
Time-Overcurrent Elements
Pickup Range: 0.25–16.00 A, 0.01 A steps
(5 A nominal)
0.10–16.00 A, 0.01 A steps
(5 A nominal—for residual ground
elements)
0.05–3.20 A, 0.01 A steps
(1 A nominal)
0.02–3.20 A, 0.01 A steps
(1 A nominal—for residual ground
elements)
0.005–0.640 A, 0.001 A steps
(0.2 A nominal neutral channel (IN)
current input)
0.005–0.160 A, 0.001 A steps
(0.05 A nominal neutral channel (IN)
current input)
Steady-State
Pickup Accuracy:
±0.05 A and ±3% of setting
(5 A nominal)
±0.01 A and ±3% of setting
(1 A nominal)
±0.005 A and ±3% of setting
(0.2 A nominal neutral channel (IN)
current input)
±0.001 A and ±5% of setting
(0.05 A nominal neutral channel (IN)
current input)
Time Dial Range: 0.50–15.00, 0.01 steps (US)
0.05–1.00, 0.01 steps (IEC)
0.10–2.00, in 0.01 steps (recloser
curves)
Curve Timing Accuracy: ±1.50 cycles and ±4% of curve time for
current between 2 and 30 multiples of
pickup
±3.50 cycles and ±4% of curve time for
current between 2 and 30 multiples of
pickup for 0.05 A nominal neutral
channel (IN) current input
Under- and Overvoltage Elements
Pickup Ranges:
Wye-connected
(Global setting
PTCONN=WYE):
0.00–200.00 V, 0.01 V steps
(negative-sequence element)
0.00–300.00 V, 0.01 V or 0.02 V steps
(various elements)
0.00–520.00 V, 0.02 V steps
(phase-to-phase elements)
Open-delta connected
(when available, by
Global setting
PTCONN=DELTA):
0.00–120.00 V, 0.01 V steps
(negative-sequence elements)
0.00–170.00 V, 0.01 V steps
(positive-sequence element)
0.00–300.00 V, 0.01 V steps
(various elements)
Steady-State Pickup
Accuracy:
±0.5 V plus ±1% for 12.5–300.00 V
(phase and synchronizing elements)
±0.5 V plus ±2% for 12.5–300.00 V
(negative-, positive-, and zero-
sequence elements, phase-to-phase
elements)
Transient Overreach: ±5% of pickup
Synchronism-Check Elements
Slip Frequency
Pickup Range: 0.005–0.500 Hz, 0.001 Hz steps
Slip Frequency
Pickup Accuracy:
±0.003 Hz
Phase Angle Range: 0–80°, 1° steps
Phase Angle Accuracy: ±4°
Under- and Overfrequency Elements
Pickup Range: 40.10–65.00 Hz, 0.01 Hz steps
Steady-State plus
Transient Overshoot: ±0.01 Hz
Time Delay: 2.00–16,000.00 cycles, 0.25-cycle steps
Timer Accuracy: ±0.25 cycle and ±0.1% of setting
Undervoltage Frequency
Element Block Range:
25.00–300.00 V
LN
(wye)
or V
LL
(open-delta)
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
various timers)
Pickup and dropout
accuracy for all timers: ±0.25 cycle and ±0.1% of setting
Substation Battery Voltage Monitor
Pickup Range: 20–300 Vdc, 1 Vdc steps
Pickup accuracy: ±2% of setting ±2 Vdc
Metering Accuracy
Accuracies are specified at 20°C and at nominal system frequency
unless noted otherwise.
Voltages
V
A
, V
B
, V
C
: ±0.2% (67.0–300 V; wye-connected)
Voltages
V
AB
, V
BC
, V
CA
: ±0.4% (67.0–300 V; delta-connected)
Voltage
V
S
: ±0.2% (67.0–300 V)
Voltages
3V
0
, V
1
, V
2
:
[3V
0
not available with
delta-connected inputs] ± 0.6% (67.0–300 V)
Currents
I
A
, I
B
, I
C
±2 mA and ±0.1% (0.5–100 A)
(5 A nominal)
±0.5 mA and ±0.1% (0.1–20 A)
(1 A nominal)
Temperature coefficient:
[(0.0002%)/(°C)
2
] • (__°C – 20°C)
2
(see example below)
Currents I
N
: ±0.05 A and ±3% (0.5–100 A)
(5 A nominal)
±0.01 A and ±3% (0.1–20 A)
(1 A nominal)
±0.08 mA and ±0.1% (0.005–4.5 A)
(0.2 A nominal channel IN current
input)
±1 mA and ±5% (0.01–1.5 A) (0.05 A
nominal channel IN current input)
Currents I
1
, 3I
0
, 3I
2
: ±0.05 A and ±3% (0.5–100 A)
(5 A nominal)
±0.01 A and ±3% (0.1–20 A)
(1 A nominal)
Phase Angle Accuracy:
I
A
, I
B
, I
C
, V
S
V
A
, V
B
, V
C
(wye-
connected voltages)
V
AB
, V
BC
, V
CA
(delta
connected voltages) ±0.5°