Schweitzer Engineering Laboratories SEL-300G - Page 33

Introduction and Specifications 1-23
SEL-300G Instruction Manual Date Code 20020206
Relay Element Setting Ranges and Accuracies
Demand Ammeter Elements:
Demand Ammeter Time Constants:
5, 10, 15, 30, or 60 min
Demand Ammeter Threshold Range
5 A Model: 0.5–16.0 A
1 A Model: 0.1–3.2 A
Steady-State Pickup Accuracy
5 A Model: ±0.05 A, ±3%
1 A Model: ±0.01 A, ±3%
Inadvertent Energization Logic:
Time-Delay Pickup and
Dropout Timers: 0.00–400.00 s
Maximum Definite-Time
Delay Accuracy: ±0.1%, ±4.2 ms at 60 Hz
Breaker Failure Protection:
Implement using nondedicated overcurrent element and
SEL
OGIC Control Equation Variable Timer.
Phase Overcurrent Pickup (A secondary)
5 A Model: 0.25–100.00 A
1 A Model: 0.05–20.00 A
Steady-State Pickup Accuracy
5 A Model: ±0.05 A, ±3%
1 A Model: ±0.01 A, ±3%
Time-Delay Pickup and
Dropout Timers: 0.00–3000.00 s
Maximum Definite-Time
Delay Accuracy: ±0.1%, ±4.2 ms
SELOGIC Control Equation Variable Timers:
16 Time-Delay Pickup and
Dropout Timers: 0.00–3000.00 s
Maximum Definite-Time
Delay Accuracy: ±0.1%, ±4.2 ms at 60 Hz
Substation Battery Voltage Monitor:
Station Battery Voltage
Monitor Pickup Ranges: 35–300 Vdc
Measuring Accuracy: ±2%
Metering Accuracy:
Accuracies are specified at 20°C and at nominal system
frequency unless noted otherwise.
Voltages:
V
A
, V
B
, V
C
, V
N
, V
S
, 3V
0
,
V
1
, V
2
, V
AB
, V
BC
, V
CA
: ±0.1% (33.5–150.0 V)
Currents I
A
, I
B
, I
C
: 5 A Nominal:
±1 mA or ±0.1% (0.5–10.0 A)
1 A Nominal:
±0.2 mA or ±0.1% (0.1–2.0 A)
Temperature
coefficient: [(0.0002%)/(°C)
2
] * (__°C–20°C)
2
(see example below)
Phase Angle Accuracy: ±0.5°
5 A Nominal:
±0.05 A or ±3% (0.5–100.0 A)
Currents I
N
, I
A87
, I
B87
, I
C87
,
I
1
, 3I
0
, 3I
2
:
1 A nominal:
±0.01 A or ±3% (0.1–20.0 A)
MW / MVAR (A, B, C, and 3-phase; 5 A nominal;
wye-connected voltages):
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°
6.00% / 0.40% ±82° or ±98°
– / 0.35% ±90° (power factor = 0)
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%