1.13
Date Code 20080213 Instruction Manual SEL-351A Relay
Introduction and Specifications
Specifications
6.00% / 0.40% ±82° or ±98°
– / 0.35% ±90° (power factor = 0)
For delta-connected systems, the stated MW and MVAR
accuracies are for balanced load conditions.
Metering accuracy calculation example for currents I
A
, I
B
, and I
C
due to preceding stated temperature coefficient:
For temperature of 40°C, the additional error for currents I
A
, I
B
,
and I
C
is:
[(0.0002%)/(°C)
2
] • (40°C–20°C)
2
= 0.08%
Synchrophasor Accuracy
(Specification is with respect to MET PM command and SEL Fast
Message Synchrophasor Protocol.)
Voltages (33.5–300 V; 45–65 Hz)
Magnitudes: ±2%
Angles: ±1°
Currents (0.50–1.25 A; 45–65 Hz) (5 A nominal)
(0.10–0.25 A; 45–65 Hz) (1 A nominal)
Magnitudes: ±4%
Angles: ±1.5° at 25°C
±2.0° over the full temperature range
Currents (1.25–7.50 A; 45–65 Hz) (5 A nominal)
(0.25–2.50 A; 45–65 Hz) (1 A nominal)
Magnitudes: ±2%
Angles: ±1.0° at 25°C
±1.5° over the full temperature range
Courtesy of NationalSwitchgear.com
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