Protection Functions; Application - ABB RELION 615 SERIES Product Manual

Voltage Protection and Control
REU615
Product version: 5.0 FP1
Table 2. Supported functions, continued
Function
Analog value scaling (4 pcs)
Integer value move (4 pcs)
1, 2, ... = Number of included instances. The instances of a protection function represent the number of identical protection function blocks available in the standard
configuration.
() = optional
1) Light only
2) Available only with IEC 61850-9-2
3) Available only with COM0031-0037

3. Protection functions

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 such as capacitor banks requiring three-
phase overvoltage protection, three-phase undervoltage
protection, residual overvoltage protection, positive-sequence
undervoltage protection, negative-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 relay'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 measurement 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 relay(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 relay and the
received arc detection signal, the circuit breakers of the
incoming feeders can selectively be tripped thus isolating the
fault.
The arc detection and protection schemes of the relays
increase personnel safety and limit material damage within the
switchgear in an arc fault situation.
A binary input and output module can be selected as an option -
having three high speed binary outputs (HSO) it further
ABB
IEC 61850 A
SCA4GAPC 4
MVI4GAPC 1
decreases the total operate time with typically 4...6 ms
compared to the normal power outputs.
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 as well as three-phase
undervoltage and overvoltage protection. The relay 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 multipurpose protection function requires that
the optional RTD/mA input module has been chosen at the time
of ordering. The multi-purpose protection function enables
protection based on analog values from the relays' RTD/mA
input module, or from other devices 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 and the timers of the
protection function can be set to operate when the input values
are below or exceeds the set values.

4. Application

The standard configuration A is intended to be used in medium
voltage switchgear supplied with a dedicated voltage
measurement cubicle. The A configuration provides busbar
overvoltage and undervoltage supervision, network residual
overvoltage supervision and frequency supervision. REU615
offers the functionality needed to provide load-shedding or
generation rejection to enhance network stability. In generator
and motor applications REU615 provides supplementary
protection by detecting any deviation from the permitted
frequency and voltage values. An integrated synchrocheck
function ensures a synchronized connection of the equipment
into the network. In distribution networks containing distributed
power generation REU615 can be used for loss-of-mains (LOM)
protection for single power generating units.
The standard configuration B including voltage regulation is
intended for automatic and manual voltage regulation of power
transformers equipped with motor driven on-load tap changers.
In small substations with a single power transformer, REU615
1MRS757058 K
B
4
1
7