3.75
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Basic Relay Operations
Configuring Timekeeping
tion of the corresponding inputs to sustain appropriate operation when there is a
loss of communication. You may also want to map these bits to an alarm so
someone is notified of the loss of communication.
Configuring Timekeeping
The relay features high-accuracy timekeeping when supplied with an IRIG-B or
Ethernet PTP signal. When the supplied clock signal is sufficiently accurate,
most SEL-400 series relays can act as a phasor measurement unit (PMU) and
transmit synchrophasor data representative of the power system at fixed time
periods to an external data processor. The relay can also record COMTRADE
event report data using the high-accuracy time stamp. See Oscillography on
page 9.9 and Time-Synchronized Triggers on page 11.9 for details on these appli-
cations.
IRIG-B and PTP
The relay has two input connectors that accept IRIG-B (Inter-Range Instrumenta-
tion Group-B) demodulated time-code format: the IRIG-B pins of Serial Port 1,
and the IRIG-B BNC connector. In relays with Ethernet, Precision Time Protocol
(PTP) can also be used to provide high-accuracy time. See Section 11: Time and
Date Management for more information on using IRIG-B and PTP.
Monitoring High-Accuracy Time Source Status
The purpose of the procedure in the following steps is to show one method for
deriving the TIME Q Time Source information from Relay Word bits TSOK and
TIRIG when using an IRIG Time Source. The TSOK Relay Word bit is at logical
1 when the relay is in HIRIG time mode. For this application example, use a pro-
tection SEL
OGIC variable (PSV) to monitor timekeeping status.
PSV02 asserts when the relay is synchronized to the HIRIG source. A departure from
this condition asserts the relay alarm output (OUT108 for this application example).
This example assumes that you have successfully established communication
with the relay (see Making an EIA-232 Serial Port Connection on page 3.4). In
addition, you must be familiar with relay access levels and passwords (see
Changing the Default Passwords in the Terminal on page 3.10 to change the
default access level passwords). Also, you should be familiar with QuickSet (see
Section 2: PC Software).
Step 1. Start QuickSet and establish a connection with the relay. See Step 1
and Step 2 of Checking Relay Status in QuickSet on page 3.12 for
detailed steps.
Step 2. Read the present configuration in the relay. Click File > Read.
The relay sends all configuration and settings data to QuickSet.
Step 3. Access the protection free-form SEL
OGIC settings.
a. Click the arrow next to Group 1 in the Settings tree view.
b. Click the Protection Logic 1 settings (see Figure 3.67).
Step 4. Enter the two lines of SEL
OGIC control equation programming in the
Protection Free-Form Logic Settings shown in Figure 3.67.
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