Ct Earthing Direction; Railway Specific Applications For Refpdif Function; Setting Guidelines; Setting And Configuration - ABB RER670 Applications Manual
Relion 670 series, railway application
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Also See for RER670:
- Commissioning manual (216 pages) ,
- Installation manual (112 pages) ,
- Communication protocol manual (48 pages)
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1MRK 506 375-UEN A
6.1.2.2
6.1.2.3
6.1.3
6.1.3.1
Railway application RER670 2.2 IEC
Application manual
CT earthing direction
To make the restricted earth fault protection REFPDIF operate correctly, the main
CTs are always supposed to be star -connected. The main CT's neutral (star)
formation can be positioned in either way, ToObject or FromObject. However,
internally REFPDIF always uses reference directions towards the protected
transformers, as shown in Figure 29. Thus the IED always measures the primary
currents on all sides and in the neutral of the power transformer with the same
reference direction towards the power transformer windings.
The main CT's connection type can be freely selected for each of the involved
current transformers.
Railway specific applications for REFPDIF function
If appropriate configuration and settings are applied, the REFPDIF function can
also be used for the following special applications in the railway supply system:
•
Defrost protection, when a single phase differential protection is temporary
arranged among two CTs during de-icing operation of the catenary contact line
wires.
•
Single phase differential protection applied across one winding (i.e. either over
one single-phase transformer winding or a generator winding).
Setting guidelines
Setting and configuration
Recommendation for analog inputs
ISI: Neutral current input.
I2P: Phase currents from winding HV side current transformer set.
Recommendation for Binary input signals
BLOCK: The input will block the operation of the function. It can be used, for
example, to block the operation during special service conditions for a limited time.
Recommendation for output signals
START: The start output indicates that Idiff is in the operate region of the operate-
restraint characteristic.
TRIP: The trip output is activated when all operating criteria are fulfilled.
DIROK: The output is activated when the directional criteria has been fulfilled.
BLK2H: The output is activated when the function is blocked due to high level of
second harmonic.
Section 6
Differential protection
GUID-F8184D63-C28F-4016-BDE8-CD1B081105CA v1
M13048-29 v13
IP14942-1 v1
M13052-3 v3
M13052-8 v10
M13052-17 v8
M13052-21 v9
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