Operation Principle - ABB RELION REX640 Technical Manual

1MRS759142 C
5.14.5
REX640
Technical Manual
See the preprocessing function blocks in this document for the
possible signal sources.
There are a few special conditions which must be noted with the configuration.
Table 1105: Special conditions
Condition
U3P connected to real measurements
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "on" and "off".
The operation of DPSRDIR can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
I
I3P 1
U
U3P
1
BLOCK
GUID-D7BF92A3-47F1-4D59-9A4A-743E8B9317A2 V1 EN
Figure 640: Functional module diagram
Directional detector
The Directional detector module compares the angle of the positive-sequence current
I1 to the angle of the positive-sequence voltage V1. Using the positive-sequence
voltage angle as reference, the positive-sequence current angle is compared to the
Characteristic angle setting. If the angular difference is within the operating sector
selected with the Directional mode setting, the On signal is sent to Timer.
Protection related functions
Description
The function can work with any two phase voltage
channels connected but it is recommended to
connect all three voltage channels.
Timer
Directional
t
detector
Low level
blocking
Blocking
logic
Section 5
DIRECTION
RELEASE
1185