ROA: Relay operate angle for zero sequence directional feature. It is used to
differentiate an internal fault and an external fault based on measured zero sequence
current and neutral current.
CTFactorPri1
: A factor to allow a sensitive function also at multi-breaker arrangement
where the rating in the bay is much higher than the rated current of the transformer
winding. The stabilizing can then be high so an unnecessary high fault level can be
required. The setting is normally 1.0 but in multi-breaker arrangement the setting shall
be CT primary rating/IBase.
CTFactorPri2: A factor to allow a sensitive function also at multi-breaker arrangement
where the rating in the bay is much higher than the rated current of the transformer
winding. The stabilizing can then be high so an unnecessary high fault level can be
required. The setting is normally 1.0 but in multi-breaker arrangement the setting shall
be CT primary rating/IBase.
CTFactorSec1: See setting CTFactorPri1. Only difference is that CTFactorSec1 is
related to W2 side.
CTFactorSec2: See setting CTFactorPri2. Only difference is that CTFactorSec2 is
related to W2 side.
1MRK 502 071-UUS A Section 7
Differential protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 193
Application manual
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