152
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Using the HMI:
To change the settings for Trip 1 go to
Output SWGRP\Trip 1
and press the
[E]-button. The different protection functions are displayed one at a time. By
pressing the [
→
] or [
←
] navigation push button, it is possible to scroll between the
different protections. By pressing the [
↑
] or [
↓
] navigation push button, the specific
protection function trip signal can be connected or disconnected. When the three-
stage overcurrent (3I> 3I>> and 3I>>>), two-stage earth fault (Io> and Io>>)
protection is selected the checksum for Trip 1 is 31.
9.2.3.4.
Indication and control connections
All the necessary settings for the indication and control signals of the circuit breaker
and the disconnector for the incoming feeder can be set as described in the first
application example on Section 9.1. Outgoing feeder, Basic B01 onwards for the
outgoing feeder (except for the earth switch). The settings are made by means of the
Relay Setting Tool or the local HMI. The settings can be found in:
Main menu\Configuration\Input Signals\
Main menu\Configuration\Input SWGRP\
Main menu\Configuration\Output Signals\
Main menu\Configuration\Output SWGRP\
.
9.2.4.
Implementations
In the sections below a few implementation examples for the standard configuration
B01 are presented.
9.2.4.1.
Blocking signal received from the outgoing feeder
The start signals from the overcurrent protection of the outgoing feeder can be
connected in order to block the overcurrent protection stages on the incoming feeder.
There are two input blocking signals, Blocking 1 and Blocking 2, which can have
different functions depending on the different protections.
The Blocking 1 input signal is connected to the BS1 input and the Blocking 2 input
signal is connected to the BS2 input of the overcurrent stages 3I>, 3I>> and 3I>>>.
The BS1 in this application example will stop the DT or IDTM timer and the BS2
will block the trip signal. Refer to the CD-ROM
Technical Descriptions of Functions
(see Section 1.5. Related documents) for more information.
In this application example, the digital input DI9 is connected to the input signal
Blocking 1 and then routed to the BS1 input of the overcurrent stage 3I>>>. The
Blocking 1 signal can be found in
Main menu\Configuration\Input
Signals\Blocking 1\
where the DI9 is selected. The checksum for the
switchgroup in
Main menu\Configuration\Input SWGRP
\Blocking 1\
should be 4 to block 3I>>>.
9.2.4.2.
Outgoing blocking signal to the overcurrent relay on the HV side
The start signals from the overcurrent protection function can be routed to an output
relay to provide a blocking signal. The overcurrent stages 3I>> and 3I>>> have also
a separate BSOUT signal for blocking purpose.
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