Schweitzer Engineering Laboratories SEL-351A, Руководство пользователя

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3.23
Date Code 20080213
Instruction Manual SEL-351A Relay
Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Time-Overcurrent Elements
Settings Ranges
See Section 9: Setting the Relay for additional time-overcurrent element
setting information.
Accuracy
Pickup:
±0.05 A secondary and ±3% of setting
(5 A nominal channel
IN
current input)
±0.01 A secondary and ±3% of setting
(1 A nominal channel
IN current input)
±5 mA secondary and ±3% of setting
(0.2 A nominal channel
IN
current input)
±1 mA secondary and ±5% of setting
(0.05 A nominal channel
IN current input)
Curve Timing:
±1.50 cycles and ±4% of curve time for currents between (and including)
2 and 30 multiples of pickup
±3.50 cycles and ±4% of curve time for currents between (and including)
2 and 30 multiples of pickup for 0.05 A nominal channel
IN
current input
Residual-Ground
Time-Overcurrent
Element(s)
One or two residual-ground time-overcurrent elements are available. The
element(s) are enabled with the E51G enable setting as shown in
Table 3.5 .
Table 3.4 Neutral-Ground Time-Overcurrent Element Settings
Setting Definition Range
51NP pickup 0.500–16.000 A secondary
(5 A nominal channel
IN current input)
0.100–3.200 A secondary
(1 A nominal channel
IN current input)
0.005–0.640 A secondary
(0.2 A nominal channel
IN current input)
0.005–0.160 A secondary
(0.05 A nominal channel
IN current input)
51NC curve type U1–U5 (US curves) see Figure 9.1 – Figure 9.10
C1–C5 (IEC curves)
51NTD time dial 0.50–15.00 (US curves) see Figure 9.1 – Figure 9.10
0.05–1.00 (IEC curves)
51NRS electromechanical
reset timing
Y, N
51NTC SEL
OGIC
control
equation torque
control setting
Relay Word bits referenced in Table 9.5 or set directly
to logical 1 (= 1)
a
a
SEL
OGIC
control equation torque control setting (e.g., 51NTC) cannot be set directly to
logical 0.
Courtesy of NationalSwitchgear.com