ABB REU615, Product Manual, Page: 6 / 60

Table 2. Supported functions, continued
Functionality A B
RTD/mA measurement - o
Frequency measurement ● -
● = included, o = optional at the time of order
1) The instances of a protection function represent the number of identical function blocks available in a standard configuration. By setting the
application specific parameters of an instance, a protection function stage can be established.
2) U
0
selectable by parameter, U
0
measured as default.
3) Light only.
4) Multi-purpose protection is used for, for example, RTD/mA based protection.
5) Available in IED and SMT but not connected to anything in logic.
3. Protection functions
Standard configuration A
Standard configuration A is intended for busbar
voltage supervision, load shedding
(disconnection) and restoration (reconnection)
applications. It is also used for overfrequency and
underfrequency protection of power generators
and for other AC equipment, e.g. capacitor
banks, requiring three-phase overvoltage
protection, three-phase undervoltage protection,
residual overvoltage protection, positive phase
sequence undervoltage protection, negative
phase sequence overvoltage protection and
frequency supervision.
The integrated load shedding and restoration
functionality offers five instances for
disconnection and reconnection of less-important
loads in network overload situations. The five
instances enable the connected feeders to be
more thoroughly prioritized and grouped thus
facilitating the securing of critical applications.
If the restoration process is coordinated by an
automation system or process control system, the
IED’s load shedding and restoration function can
send a signal to the system when the
prerequisites for network restoration are fulfilled.
Enhanced with optional hardware and software,
standard configuration A also features three light
detection channels for arc fault detection in the
metering cubicle or busbar compartment of metal-
enclosed switchgear. The arc-fault detection
sensor interface is available on the optional
communication module.
When an arc arises the detection signal is sent to
the protection IED(s) of the incoming feeder(s) as
a binary signal using either hardwired signalling or
horizontal GOOSE messaging. By simultaneous
utilization of the overcurrent condition of the
incoming feeder protection IED and the received
arc detection signal, the circuit breakers of the
incoming feeders can selectively be tripped thus
isolating the fault.
The arc detection/protection schemes of the IEDs
increase personnel safety and limit material
damage within the switchgear in an arc fault
situation.
Standard configuration B
Standard configuration B is intended for
automatic voltage regulation of power
transformers equipped with an on-load tap-
changer. It also features three-stage three-phase
non-directional overcurrent protection, three-
phase undervoltage and overvoltage protection.
The IED also incorporates a thermal overload
protection function, which supervises the thermal
stress of the transformer windings to prevent
premature aging of the winding's insulation.
The use of the multi-purpose protection function
requires that the optional RTD/mA input module
has been chosen when ordering. The multi-
purpose protection function enables protection
based on analog values from the IEDs RTD/mA
input module, or from other IEDs using analog
horizontal GOOSE messaging. The protection
function includes three instances, and the used
analog values may, for example, consist of
temperature, current, voltage or pressure values.
By using the analog values, the set limit values
Voltage Protection and Control 1MRS757058 D
REU615
Product version: 4.0
6 ABB