Settings For Each Step (X = 1 And 2) - ABB RER670 Applications Manual

1MRK 506 375-UEN A
8.4.3.1
Railway application RER670 2.2 IEC
Application manual
is required, it is important to set the definite time delay for that step
to zero.
The parameters for the two step residual overcurrent protection, zero sequence
direction EF2PTOC is set via the local HMI or PCM600.
The following settings can be done for the two step residual overcurrent protection.
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
Operation: Sets the protection to On or Off.

Settings for each step (x = 1 and 2)

DirModex: The directional mode of step x. Possible settings are Off/Non-
directional.
Characterist1: Selection of time characteristic for step 1. Definite time delay and
different types of inverse time characteristics are available.
Inverse time characteristic enables fast fault clearance of high current faults at the
same time as selectivity to other inverse time phase overcurrent protections can be
assured. This is mainly used in radial fed networks but can also be used in meshed
networks. In meshed networks the settings must be based on network fault
calculations.
To assure selectivity between different protections, in the radial network, there
have to be a minimum time difference Dt between the time delays of two
protections. The minimum time difference can be determined for different cases.
To determine the shortest possible time difference, the operation time of
protections, breaker opening time and protection resetting time must be known.
These time delays can vary significantly between different protective equipment.
The following time delays can be estimated:
Protection operate time:
Protection resetting time:
Breaker opening time:
The different characteristics are described in the technical reference manual.
INx>: Operate residual current level for step x given in % of IBase.
kx: Time multiplier for the dependent (inverse) characteristic for step x.
IN1Min: Minimum operate current for step 1 in % of IBase.
Current protection
15-60 ms
15-60 ms
20-120 ms
Section 8
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