Date Code 20011112
Introduction and Specifications
1-13
SEL-311L Instruction Manual
Environmental
Cold:
IEC 60068-2-1–1990, Test Ad;
16 hr. @ –40°C
Dry Heat:
IEC 60068-2-2–1974, Test Bd;
16 hr. @ +85°C
Damp Heat, Cyclic:
IEC 60068-2-30–1980, Test Db; 55°C,
6 cycles, 95% humidity
Vibration:
IEC 60255-21-1–1988, Class 1
IEC 60255-21-2–1988, Class 1
IEC 60255-21-3–1993, Class 2
Object Penetration:
IEC 60529–1989, IP30
Safety
Dielectric Strength:
IEC 60255-5–1977; IEEE C37.90–1989
2500 Vac for 10 seconds on analog inputs;
3100 Vdc for 10 seconds on power supply,
optoisolated inputs, and output contacts;
1500 Vac on isolated EIA-422 and G.703
ports.
Impulse:
IEC 60255-5–1977, 0.5 J, 5000 V
Laser Safety:
IEC 60825-1–1993; 21 CFR 1040.10;
ANSI Z136.1–1993; ANSI Z136.2–1988,
eye-safe Class 1 laser product
Certifications:
ISO: Relay is designed and manufactured using ISO 9001 certified
quality program.
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.
Current Differential Processing
16 times per power system cycle for line current differential
protection and tripping logic.
Backup Protection
and Control Processing
4 times per power system cycle.
Summary of Contents for SEL-311L
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