Measurement; Disturbance Recorder; Event Recorder; Trip-Circuit Supervision - ABB REM610 Product Manual

Motor Protection
REM610
Product version: C

5. Measurement

The IED physically measures the phase
currents and the residual current. From the
phase currents, the IED calculates the thermal
overload and the negative-phase-sequence
current of the protected motor or generator.
REM610 also measures a number of
characteristic currents of the protected object
during startup and duty operation. Further,
by means of an optional measurement card,
the IED can directly measure up to eight
temperatures via six RTD and two thermistor
type sensors.
The values measured can be accessed locally
via the user interface on the IED front panel
or remotely via the serial communication
interface on the rear panel of the IED.

6. Disturbance recorder

The IED is provided with a built-in battery
backed-up digital disturbance recorder for
four analog signal channels 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 IED signals, e.g.
the start or trip signals of IED stages, external
blocking or control signals. Any digital IED
signal such as a protection start or trip signal,
or an external IED control signal can be set
to trigger the recording. The recordings are
stored in a non-volatile memory from which
the data can be uploaded for subsequent fault
analysis.

7. Event recorder

To provide network control and monitoring
systems with bay level event logs, the IED
incorporates a non-volatile memory with
capacity of storing 100 event codes including
8
the time stamps.The non-volatile memory
retains its data also in case the IED
temporarily loses its auxiliary supply.The
event log facilitates detailed pre- and post-
fault analyses of the faults and disturbances.
8. 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 and in its open position. It also
detects the loss of circuit-breaker control
voltage.

9. Self-supervision

The IED's built-in self-supervision system
continuously monitors the state of the IED
hardware and the operation of the IED
software. Any fault or malfunction detected
will be used for alerting the operator.

10. Inputs/Outputs

• Four current transformers
• Two digital inputs
• Three additional digital inputs on an
optional RTD module
• Three normally open heavy duty output
contacts
• Two change-over signal output contacts
• One dedicated IRF contact
• Input/output contacts freely configurable
1MRS756304 C
Issued: 30.10.2009
ABB