Schweitzer Engineering Laboratories SEL-351 - IRIG-B Time-Code Input

2-16 Installation Date Code 20001006
SEL-351 Instruction Manual
IRIG-B Time-Code Input
The SEL-351 Relay accepts a demodulated IRIG-B time signal to synchronize the relay internal
clock with some external source. The demodulated IRIG-B time signal can come via the
SEL-2020 or SEL-2030 Communications Processors, or the SEL-2100 Protection Logic Processor
listed in Table 2.1.
A demodulated IRIG-B time code can be input into Serial Port 2 on any of the SEL-351 Relay
models (see Table 10.2). This is handled adeptly by connecting Serial Port 2 of the SEL-351
Relay to an SEL-2020, SEL-2030, or SEL-2100 with Cable C273A.
A demodulated IRIG-B time code can be input into the connector for Serial Port 1 on models
0351x0, 0351x1, and 0351xY (see Table 10.3). If demodulated IRIG-B time code is input into
this connector, it should not be input into Serial Port 2 and vice versa.
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