ABB RELION REB670, Руководство по эксплуатации продукта

Страница: 4 / 62

Flexible, software based dynamic Zone Selection enables
easy and fast adaptation to the most common substation
arrangements such as single busbar with or without transfer
bus, double busbar with or without transfer bus, one-and-a-
half breaker stations, double busbar-double breaker stations,
ring busbars, and so on. The software based dynamic Zone
Selections ensures:
• Dynamic linking of measured CT currents to the
appropriate differential protection zone as required by
substation topology
• Efficient merging of the two differential zones when
required by substation topology (that is load-transfer)
• Selective operation of busbar differential protection
ensures tripping only of circuit breakers connected to
the faulty zone
• Correct marshaling of backup-trip commands from
internally integrated or external circuit breaker failure
protections to all surrounding circuit breakers
• Easy incorporation of bus-section and/or bus-coupler
bays (that is, tie-breakers) with one or two sets of CTs
into the protection scheme
• Disconnector and/or circuit breaker status supervision
Advanced Zone Selection logic accompanied by optionally
available end-fault and/or circuit breaker failure protections
ensure minimum possible tripping time and selectivity for
faults within the blind spot or the end zone between bay CT
and bay circuit breaker. Therefore REB670 offers best
possible coverage for such faults in feeder and bus-section/
bus-coupler bays.
Optionally available circuit breaker failure protection, one for
every CT input into REB670, offers secure local back-up
protection for the circuit breakers in the station.
Optionally available four-stage, non-directional overcurrent
protections, one for every CT input into REB670, provide
remote backup functionality for connected feeders and
remote-end stations.
It is normal practice to have just one busbar protection IED
per busbar. Nevertheless some utilities do apply two
independent busbar protection IEDs per zone of protection.
REB670 IED fits both solutions.
A simplified bus differential protection for multi-phase faults
and earth faults can be obtained by using a single, one-phase
REB670 IED with external auxiliary summation current
transformers.
The wide application flexibility makes this product an
excellent choice for both new installations and the
refurbishment of existing installations.
Description of 3 ph package A20
Three-phase version of the IED with two low-impedance
differential protection zones and four three-phase CT inputs
A20. The version is intended for simpler applications such as
T-connections, meshed corners, and so on.
Description of 3 ph package A31
Three-phase version of the IED with two low-impedance
differential protection zones and eight three-phase CT inputs
A31. The version is intended for applications on smaller
busbars, with up to two zones and eight CT inputs.
Description of 1 ph packages B20 and B21
One-phase version of the IED with two low-impedance
differential protection zones and twelve CT inputs B20, B21.
• Due to three available binary input modules, the B20 is
intended for applications without need for dynamic Zone
Selection such as substations with single busbar with or
without bus-section breaker, one-and-half breaker or
double breaker arrangements. Three such IEDs offer
cost effective solutions for such simple substation
arrangements with up to twelve CT inputs.
• The B21 is intended for applications in substations
where dynamic Zone Selection or bigger number of
binary inputs and outputs is needed. Such stations for
example are double busbar station with or without
transfer bus with up to 12 CT inputs. Note that binary
inputs can be shared between phases by including the
LDCM communication module. This simplifies panel
wiring and saves IO boards.
• This version can be used with external auxiliary 3-phase
to 1-phase summation current transformers with
different turns ratio for each phase.
Description of 1 ph package B31
One-phase version of the IED with two low-impedance
differential protection zones and twenty-four CT inputs B31.
• The IED is intended for busbar protection applications in
big substations where dynamic Zone Selection, quite
large number of binary inputs and outputs and many CT
inputs are needed. The IED includes two differential
zones and twenty-four CT inputs. Note that binary inputs
can be shared between phases by including the LDCM
communication module. This simplifies panel wiring and
saves IO boards.
• This version can be used with external auxiliary 3-phase
to 1-phase summation current transformers with
different turns ratio for each phase.
Available configurations for pre-configured REB670
Three configurations have been made available for pre-
configured REB670 IED. It shall be noted that all three
configurations include the following features:
Busbar protection REB670 1MRK505212-BEN E
Pre-configured
Product version: 1.2
4 ABB