Completed with the optional synchrocheck func-
tion, voltage remant protection, and process bus
with sampled values of analog phase voltages, re-
lays with standard config. L ensure a safe intercon-
nection of two networks.
The standard configuration N provides the highest
functionality level of all standard configurations. It
is delivered as preconfigured, in the same way as
other 615 standard configurations. It is typically re-
configured when taken into use. This allows flexibil-
ity in standardizing one type of REF615. Depending
on the specific feeder application the appropriate
functionality can be selected and own configura-
tions can be created with the Application Configu-
ration tool in PCM600. Standard configuration N is
not designed for using all the available functional-
ity content in one relay at the same time. In order to
ensure the performance of the relay the user spe-
cific configuration load is verified with Application
Configuration tool of PCM600.
In addition to directional ground-fault protection,
one of these three functions can be ordered as an
option: admittance-based, harmonics-based or
wattmetric-based earth-fault protection. Admit-
tance- and wattmetric-based earth-fault protec-
tion functions are available for standard configura-
tions L and N. Harmonics-based earth-fault
protection is available for standard configurations
D, F, L and N. The admittance-based earth-fault
protection ensures a correct operation of the pro-
tection even though the connection status informa-
tion of the Petersen coil is missing. The standard
configurations L and N additionally offer multifre-
quency admittance-based ground-fault protection.
The configuration P provides the ideal functionality
for the implementation of Main-Tie-Main and Main-
Tie-Tie-Main Automatic Transfer Schemes. With Di-
rectional and non-directional overcurrent protec-
tion, for one breaker, and six voltage inputs for
undervoltage, overvoltage, negative-sequence volt-
age, and voltage remnant protection. The voltage
remnant protection is ideal for the implementation
Automatic Transfer schemes with motor loads con-
nected to the bus, where supervision is required to
prevent re-energizing the motors, before the power
is at an acceptable level. The configuration P is
completed with synchro-check functionality for the
implementation of Automatic Transfer Schemes
where the incoming sources would be paralleled
momentarily to increase reliability.
16 REF615 ANSI 5.0 FP1 FEEDER PROTECTION AND CONTROL
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