and be assigned to the remote relay’s binary outputs or internal
logics.
The protection communication supervision continuously
monitors the protection communication link. The relay
immediately blocks the line differential protection function in
case that severe interference in the communication link, risking
the correct operation of the function, is detected. An alarm
signal will eventually be issued if the interference, indicating
permanent failure in the protection communication, persists.
The two high-set stages of the overcurrent protection are
further by default released.
GUID-12C57326-6CB9-4FA9-B9F4-3D8F21015DCF V2 EN
Figure 11. Pilot wire protection communication link
18. Access control
To protect the relay from unauthorized access and to maintain
information integrity, the relay is provided with a four-level, role-
based authentication system with administrator-programmable
individual passwords for the viewer, operator, engineer and
administrator level. The access control applies to the front-
panel user interface, the Web browser-based user interface
and PCM600.
19. Inputs and outputs
Depending on the standard configuration selected, the relay is
equipped with three phase-current inputs and one residual-
current input for non-directional earth-fault protection and
current circuit supervision, or three phase-current inputs, one
residual-current input and one residual voltage input for
directional earth-fault protection and current circuit
supervision.
The standard configuration E includes one conventional
residual current (Io 0.2/1 A) input and three sensor inputs for the
direct connection of three combi-sensors with RJ-45
connectors. As an alternative to combi-sensors, separate
current and voltage sensors can be utilized using adapters.
Furthermore, the adapters also enable the use of sensors with
Twin-BNC connectors.
The phase-current inputs are rated 1/5 A. Two optional
residual-current inputs are available, that is, 1/5 A or 0.2/1 A.
The 0.2/1 A input is normally used in applications requiring
sensitive earth-fault protection and featuring core-balance
current transformers. The residual-voltage input covers the
rated voltages 60...210 V.
The phase-current input 1 A or 5 A, the residual-current input 1
A or 5 A, alternatively 0.2 A or 1 A, and the rated voltage of the
residual voltage input are selected in the relay software. In
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