7.43
Date Code 20170927 Instruction Manual SEL-751 Relay
Communications
Communications Protocols
For more information on metering and example responses for each meter
class, see Section 5: Metering and Monitoring.
On issuing the MET c R command for resetting metering quantities in class c,
the relay responds:
Reset Metering Quantities (Y,N)? Upon
confirming (pressing Y), the metering quantities are reset and the relay
responds with
Reset Complete.
OPEN Command (Open Breaker)
The OPE (OPEN) command asserts Relay Word bit OC for 1/4 cycle when it
is executed. Relay Word bit OC can then be programmed into the TR
SEL
OGIC control equation to assert the TRIP Relay Word bit, which in turn
asserts an output contact (e.g., OUT103 = TRIP) to open a circuit breaker (see
Table 4.52 and Figure 4.34 for factory-default setting TR and trip logic).
To issue the OPE command, enter the following.
Typing N <Enter> after the previous prompt aborts the command.
The main board breaker jumper (see Tabl e 2.17) supervises the OPE
command. If the Breaker jumper is not in place (Breaker jumper = OFF), the
relay does not execute the OPE command and responds with the following.
Table 7.32 Meter Class
c
Meter Class
F (or MET) Fundamental Metering
E
a
a
Reset Metering Available.
Energy Metering
M
a
Maximum/Minimum Metering
RMS RMS Metering
T Thermal and RTD Metering
AI Analog Input (transducer) Metering
DE
a
Demand Metering
PE
a
Peak Demand Metering
PM Synchrophasor Metering
L Light Metering for Arc-Flash Detection (AFD)
MV SEL
OGIC Math Variable Metering
RA Remote Analog Metering
HIF High-Impedance Fault (HIF) Metering
=>>OPE <Enter>
Open Breaker (Y,N)? Y <Enter>
=>>
=>>OPE <Enter>
Command Aborted: No Breaker Jumper
=>>
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