Protection Functions - ABB REF630 Product Manual

Feeder Protection and Control
REF630
Product version: 1.0
Table 2. Supported functions, continued
Functionality
Residual voltage
Power monitoring with P, Q, S, power factor, frequency
Sequence current
Sequence voltage
Metering
Pulse counter for energy metering
Disturbance recorder function
Analog channels 1-10 (samples)
Analog channel 11-20 (samples)
Analog channel 21-30 (samples)
Analog channel 31-40 (calc val)
Binary channels 1-16
Binary channels 17-32
Binary channels 33-48
Binary channels 49-64
1) Optional functions, to be specified at ordering

4. Protection functions

The IED offers selective short-circuit and
overcurrent protection including three-phase
non-directional overcurrent protection with
four independent stages, and three-phase
directional overcurrent protection with three
independent stages. In addition, the IED
includes three-phase current inrush detection
for blocking selected overcurrent protection
stages or temporarily increasing the setting
values. The included thermal overload
protection function uses thermal models of
overhead lines and cables. The negative-
sequence overcurrent protection, with two
independent stages, is used for phase-
unbalance protection. In addition, the IED
offers phase discontinuity protection.
8
A B
1 1
1 1
1 1
1 1
- -
1 1
- -
- -
- -
1 1
1 1
1 1
1 -
Further, the IED features selective earth-fault
and cross country fault protection for isolated
neutral, and for resistance and/or impedance
earthed neutral systems including solidly
earthed neutral systems. The earth-fault
protection includes non-directional earth-fault
protection with three independent stages and
directional earth-fault protection with four
independent stages.
The included transient/intermittent earth-fault
protection is based on detection of earth-fault
transients related to continuous or
intermittent faults. Intermittent earth-fault is
special type of earth-fault encountered in
compensated networks with underground
cables. In solidly earthed or compensated
networks the transient earth-fault protection
function detects earth-faults with low fault
resistance. The residual overvoltage
1MRS756380 A
Issued: 15.09.2009
C D N
1 - 1
1 1 1
1 1 1
1 1 1
- - 4
1 1 1
- - 1
- - 1
- - 1
1 1 1
1 1 1
1 1 1
1 - 1
ABB