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Feeder Protection
REF610
Product version: C
and eight digital signal channels. The analog channels can be
set to record the curve form of the currents measured. The
digital channels can be set to record external or internal relay
signals, for example the start or trip signals of protection relay's
stages, external blocking or control signals. Any digital relay
signal such as a protection start or trip signal, or an external
relay control signal can be set to trigger the recording. The
recordings are stored in a nonvolatile memory from which the
data can be uploaded for subsequent fault analysis.
7. Event recorder
To provide network control and monitoring systems with feeder
level event logs, the protection relay incorporates a nonvolatile
memory with capacity of storing 100 event codes including the
time stamps.The nonvolatile memory retains its data also in
case the protection relay temporarily loses its auxiliary
supply.The event log facilitates detailed pre- and post-fault
analyses of feeder faults and distribution disturbances.
8. Circuit-breaker monitoring
The protection relay constantly monitors the tear and wear of
the protected feeder's circuit breaker by using a set of built-in
condition monitoring counters. The monitoring counters
provide the circuit breaker with operational history data. This
data can be used for scheduling preventive maintenance
programs for the circuit breaker.
9. Trip-circuit supervision
The trip-circuit supervision continuously monitors the
availability and operability of the trip circuit. It provides open-
circuit monitoring both when the circuit breaker is in its closed
ABB
and in its open position. It also detects loss of circuit-breaker
control voltage.
10. 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.
11. Inputs/Outputs
• Four current transformers
• Two digital inputs
• Three additional digital inputs on an optional I/0 module
• Three normally open heavy duty output contacts
• Two change-over signal output contacts
• Three additional signaling contacts on an optional I/O module
• One dedicated IRF contact
• Input/output contacts freely configurable
12. Communication
The protection relays are connected to the fiber-optic
communication bus directly or via bus connection modules and
gateways. The bus connection module converts the protection
relay's electrical signals to optical signals for the
communication bus and, vice versa, the communication bus'
optical signals to electrical signals for the protection relay.
1MRS756295 G
7
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