Functional Diagrams For Protection - ABB RELION 615 Series Applications Manual

Section 3
RED615 standard configurations
3.4.3.1
72
The signal marked with VA, VB and VC represents the three phase voltages.
The protection relay offers six different setting groups which can be set based on
individual needs. Each group can be activated or deactivated using the setting group
settings available in the protection relay.
Depending on the communication protocol the required function block needs to be
instantiated in the configuration.

Functional diagrams for protection

The functional diagrams describe the relay's protection functionality in detail and
according to the factory set default connections.
Line differential protection with in-zone power transformer LNPLDF1_87L-1 is intended
to be the main protection offering exclusive unit protection for the power distribution lines
or cables. The stabilized low stage can be blocked if the current transformer failure is
detected. The trip value of the instantaneous high stage can be multiplied by predefined
settings if the ENA_MULT_HS input is activated. In this configuration, it is activated by
the open status information of the remote-end circuit breaker and ground switch, and if the
disconnector is not in the intermediate state. The intention of this connection is to lower
the setting value of the instantaneous high stage by multiplying with setting High Op value
Mult in case of internal fault.
Alarm LED3 informs when the line differential is not available possibly due to a failure
in protection communication, or if the function is set in a test mode.
1MAC807603-MB A
RED615 ANSI
Application Manual