Functional Diagrams; Functional Diagrams For Protection - ABB RED615 Applications Manual

1MRS758127 C
3.3.3
3.3.3.1
RED615
Application Manual

Functional diagrams

The functional diagrams describe the default input, output, alarm LED and function-
to-function connections. The default connections can be viewed and changed with
PCM600 according to the application requirements.
The analog channels have fixed connections to the different function blocks inside the
protection relay's standard configuration. However, the 12 analog channels available
for the disturbance recorder function are freely selectable as a part of the disturbance
recorder's parameter settings.
The phase currents to the protection relay are fed from a current transformer. The
residual current to the protection relay is fed from either residually connected CTs, an
external core balance CT, neutral CT or calculated internally.
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 or via binary input.
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 protection relay's protection functionality in
detail and according to the factory set default connections.
Line differential protection with in-zone power transformer LNPLDF1 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 operate 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
earth 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.
Four non-directional overcurrent stages are offered for overcurrent and short-circuit
protection. Three-phase non-directional overcurrent protection, instantaneous stage,
PHIPTOC1 can be blocked by energizing the binary input X120:BI1. The
instantaneous and first high stages are blocked by activation of line differential
protection.
RED615 standard configurations
Section 3
43