1.11
Date Code 20060320 Instruction Manual SEL-311C Relay
Introduction and Specifications
Specifications
Frequency and Rotation
System Frequency: 50 or 60 Hz
Phase Rotation: ABC or ACB
Frequency
Tracking Range: 40.1–65 Hz
Note: V
A
required for frequency tracking.
Communications Ports
EIA-232: 1 Front and 2 Rear
EIA-485: 1 Rear, 2100 Vdc isolation
Baud Rate: 300–38400
(Port 1 Baud Rate 300–19200)
Terminal Connections
Rear Screw-Terminal Tightening Torque:
Terminal Block
Minimum: 8-in-lb (0.9 Nm)
Maximum: 12-in-lb (1.4 Nm)
Connectorized
Minimum: 4.4-in-lb (0.5 Nm)
Maximum: 8.8-in-lb (1 Nm)
Terminals or stranded copper wire. Ring terminals are
recommended. Minimum temperature rating of 105°C.
Routine Dielectric Test
Voltage/Current inputs: 2500 Vac for 10 s
Power supply,
optoisolated inputs,
and output contacts: 3000 Vdc for 10 s
The following IEC 60255-5 Dielectric Tests–1977 are performed
on all units with the CE mark:
2500 Vac for 10 s on analog inputs
3100 Vdc for 10 s on power supply, optoisolated inputs, and
output contacts.
Time-Code Input
Relay accepts demodulated IRIG-B time-code input at Port 1 or 2.
Synchronization (specification is with respect to the accuracy
of the time source)
Synchrophasor: ±10 µs
Other: ±5 ms
Operating Temperature
–40° to +85°C (–40° to +185°F)
Note: LCD contrast impaired for temperatures below –20°C.
Weight
2U Rack unit: 13 lbs. (5.92 kg)
3U Rack unit: 16 lbs. (7.24 kg)
Type Tests
Environmental Tests
Cold: IEC 60068-2-1:1990, Test Ad;
16 hr. @–40°C
Damp Heat Cyclic: IEC 60068-2-30:1980, Test Db;
55°C, 6 cycles, 95% humidity
Dry Heat: IEC 60068-2-2:1974; Test Bd;
16 hr. @ +85°C
Object Penetration: IEC 60529:1989, IP30, IP54
Electrostatic Discharge Test
ESD: IEC 60255-22-2:1996, Severity Level 4
(8 kV contact, 15 kV air)
Fast Transient
Disturbance:
IEC 60255-22-4:1992
IEC 61000-4-4:1995, Severity Level 4
(4 kV on power supply, 2 kV on
inputs and outputs)
Radiated Radio
Frequency:
IEC 60255-22-3:1989
IEEE C37.90.2-1995, 35 V/m
Surge Withstand: IEEE C37.90.1-1989
3.0 kV oscillatory; 5.0 kV transient
1 MHz Burst
Disturbance:
IEC 60255-22-1:1988, Severity Level 3
(2.5 kV common and 1 kV differential
mode)
Vibration and Shock Tests
Vibration: IEC 60255-21-1:1988, Class 1
IEC 60255-21-2:1988, Class 1
IEC 60255-21-3:1993, Class 2
Impulse: IEC 60255-5:1977, 0.5 J, 5 kV
Certifications
ISO: Relay designed and manufactured using ISO 9001 certified
quality program.
UL: Listed
CSA: Certified
CE Mark
Processing Specifications
AC Voltage and Current Inputs
16 samples per power system cycle, 3 dB low-pass filter cut-off
frequency of 560 Hz.
Digital Filtering
One-cycle cosine after low-pass analog filtering. Net filtering
(analog plus digital) rejects dc and all harmonics greater than the
fundamental.
Protection and Control Processing
4 times per power system cycle
Relay Element Settings Ranges and Accuracies
Metering Accuracy
Voltages
V
A
, V
B
, V
C
, V
S
, V
1
,
V
2
, 3V
0
:
±2% (33.5–150 V)
Currents
I
A
, I
B
, I
C
, I
P
: ±1% (0.5 to 100.0 A) (5 A nominal)
±1% (0.1 to 20.0 A) (1 A nominal)
I
1
, 3I
0
, 3I
2
: ±3% (0.25 to 100.0 A)(5 A nominal)
±3% (0.05 to 20.0 A) (1 A nominal)
Phase Angle Accuracy: ±1°
MW/MVAR: ± 3%
Synchrophasor Accuracy
(Specification is with respect to MET PM command and
SEL Fast Message Synchrophasor Protocol.)
Voltages (33.5–150 V; 45–65 Hz)
Magnitudes: ±2%
Angles: ±1°
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