Schweitzer Engineering Laboratories, Inc.
SEL-787-2, -3, -4 Data Sheet
39
Inverse-Time Undervoltage (27I)
Setting Range
OFF, 2.00-300.00 V (phase elements,
positive-sequence elements with delta
inputs or synchronism-check voltage
input)
OFF, 2.00-520.00 V (phase-to-phase
elements with wye inputs)
Accuracy:
±1% of setting plus ±0.5 V
Time Dial:
0.00–16.00 s
Accuracy:
±1.5 cyc plus ±4% between 0.95 and
0.1 multiples of pickup
Inverse-Time Overvoltage (59I)
Setting Range:
OFF, 2.00–300.00 V (phase elements,
sequence elements, or phase-to-phase
elements with delta inputs or
synchronism voltage input)
OFF, 2.00–520.00 V (phase-to-phase
elements with wye inputs)
Accuracy:
±1% of setting plus ±0.5 V
Time Dial:
0.00–16.00 s
Accuracy:
±1.5 cyc plus ±4% between 1.05 and
5.5 multiples of pickup
Volts/Hertz (24)
Definite-Time Element
Pickup Range:
100%–200%
Steady-State Pickup
Accuracy:
±1% of set point
Pickup Time:
25 ms @ 60 Hz (Max)
Time-Delay Range:
0.00–400.00 s
Time-Delay Accuracy:
±0.1% plus ±4.2 ms @ 60 Hz
Reset Time Range:
0.00–400.00 s
Inverse-Time Element
Pickup Range:
100%–200%
Steady-State Pickup
Accuracy:
±1% of set point
Pickup Time:
25 ms @ 60 Hz (Max)
Curve:
0.5, 1.0, or 2.0
Factor:
0.1–10.0 s
Timing Accuracy:
±4% plus ±25 ms @ 60 Hz, for V/Hz
above 1.05 multiples (Curve 0.5 and
1.0) or 1.10 multiples (Curve 2.0) of
pickup setting, and for operating times
>4 s
Reset Time Range:
0.00–400.00 s
Composite-Time Element
Combination of definite-time and inverse-time specifications
User-Definable Curve Element
Pickup Range:
100%–200%
Steady-State Pickup
Accuracy:
±1% of set point
Pickup Time:
25 ms @ 60 Hz (Max)
Reset Time Range:
0.00–400.00 s
Directional Power (32)
Instantaneous/Definite-Time, 3 Phase Elements
Type:
+W, –W, +VAR, –VAR
Pickup Settings Range, VA secondary
5 A Model:
1.0–6500.0 VA, 0.1 VA steps
1 A Model:
0.2–1300.0 VA, 0.1 VA steps
Accuracy:
±0.10 A • (L-L voltage secondary) and
±5% of setting at unity power factor
for power elements and zero power
factor for reactive power element (5 A
nominal)
±0.02 A • (L-L voltage secondary) and
±5% of setting at unity power factor
for power elements and zero power
factor for reactive power element (1 A
nominal)
Pickup/Dropout Time:
<10 cycles
Time Delay:
0.00–240.00 seconds, 0.01-second steps
Accuracy:
±0.5% plus ±0.25 cycle
Frequency (81)
Setting Range:
OFF, 15.00–70.00 Hz
Accuracy:
±0.01 Hz (V1 > 60 V) with voltage
tracking
Pickup/Dropout Time:
<4 cycles
Time Delay:
0.00–400.00 seconds, 0.01-second steps
Accuracy:
±0.5% plus ±0.25 cycle
RTD Protection
Setting Range:
OFF, 1°–250°C
Accuracy:
±2
C
RTD Open-Circuit
Detection: >250°C
RTD Short-Circuit
Detection: <–50°C
RTD Types:
PT100, NI100, NI120, CU10
RTD Lead Resistance:
25 ohm max. per lead
Update Rate:
<3 s
Noise Immunity on RTD
Inputs:
To 1.4 Vac (peak) at 50 Hz or greater
frequency
RTD Fault/Alarm/Trip
Time Delay:
Approx. 12 s
Synchronism Check (25)
Pickup Range, Secondary
Voltage:
0.00–300.00 V
Pickup Accuracy,
Secondary Voltage:
±1% plus ±0.5 volts (over the range of
2.00–300.00 V)
Slip Frequency Pickup
Range:
0.05 Hz–0.50 Hz
Slip Frequency Pickup
Accuracy:
±0.02 Hz
Phase Angle Range:
0°–80°
Phase Angle Accuracy:
±4°
Station Battery Voltage Monitor
Operating Range:
0–350 Vdc (300 Vdc for UL purposes)
Pickup Range:
20.00–300.00 Vdc
Pickup Accuracy:
±2% of setting plus ±2 Vdc
Timers
Setting Range:
Various
Accuracy:
±0.5% of setting plus ±1/4 cycle
Metering Accuracy
Accuracies are specified at 20
C, nominal frequency, ac currents
within (0.2–20.0) • I
NOM
A secondary, and ac voltages within
50–250 V secondary unless otherwise noted.
Phase Currents
Magnitude Accuracy:
±1.0% (I
NOM
= 1 A or 5 A)
Phase Accuracy:
±1.0
(I
NOM
= 5 A), ±1.0
at 0.5–20.0
times I
NOM
(I
NOM
= 1 A), ±2.5
at
0.2–0.5 times I
NOM
(I
NOM
= 1 A)
