14. Self-supervision
The relay’s built-in self-supervision system continuously
monitors the state of the relay hardware and the operation of
the relay software. Any fault or malfunction detected is used for
alerting the operator.
A permanent relay fault blocks the protection functions to
prevent incorrect operation.
15. Fuse failure supervision
In the standard configuration B, the relay includes fuse failure
supervision functionality. The fuse failure supervision detects
failures between the voltage measurement circuit and the relay.
The failures are detected either by the negative sequence-
based algorithm or by the delta voltage and delta current
algorithm. Upon the detection of a failure, the fuse failure
supervision function activates an alarm and blocks voltage-
dependent protection functions from unintended operation.
16. Current circuit supervision
The relay includes current circuit supervision. Current circuit
supervision is used for detecting faults in the current
transformer secondary circuits. On detecting of a fault the
current circuit supervision function activates an alarm LED and
blocks certain protection functions to avoid unintended
operation. The current circuit supervision function calculates
the sum of the phase currents from the protection cores and
compares the sum with the measured single reference current
from a core balance current transformer or from separate cores
in the phase current transformers.
17. 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 levels. The access control applies to the local
HMI, the Web HMI and PCM600.
18. Inputs and outputs
The relay is equipped with three phase-current inputs, three
unbalance-current inputs and one residual-current input for
non-directional earth-fault protection.
In the standard configuration B, the relay is additionally
equipped with three phase-voltage inputs, one residual voltage
input for directional earth-fault protection and one voltage input
(Uob) that can be used for voltage based unbalance protection.
The rated level of the current inputs is 1/5 A and selectable in
the relay software. The three phase-voltage inputs and the
residual-voltage inputs cover the rated voltages 60-210 V. Both
phase-to-phase voltages and phase-to-earth voltages can be
connected. The binary input thresholds 16…176 V DC are
selected by adjusting the relay’s parameter settings.
All binary input and output contacts are freely configurable with
the signal matrix or application configuration functionality of
PCM600.
See the Input/output overview table and the terminal diagrams
for more information about the inputs and outputs.
Optionally, a binary input and output module can be selected. It
has three high speed binary outputs (HSO) and it decreases the
total operate time with typically 4...6 ms compared to the
normal power outputs.
Capacitor Bank Protection and Control
1MRS757952 D
REV615
Product version: 5.0 FP1
14
ABB
Summary of Contents for RELION REV615
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