differential current after occurrence of the fault, but condition 2 is not met and the function is therefore
blocked.
[dwinnfel-201112-01.tif, 1, en_US]
Figure 7-58 Curve Plot for Internal Fault with Transformer Saturation (k= 0.65)
[dwextfel-170712-01.tif, 1, en_US]
Figure 7-59 Curve Plot for External Fault with Transformer Saturation (k= 0.65)
Fundamental-Component Method
Parallel to the instantaneous-value method, the fundamental component works with a temporal delay. Here,
the same measured values are processed as with the I-DIFF method. The fundamental component of the
differential current I
diff
and the stabilization value (maximum current of a measuring point) I
rest.
are ordered in
the operate curve according to Figure 7-57 and the trip decision is made.
Figure 7-60 shows the overall logic.
Capacitor Bank Protection
7.8 Differential Protection for Capacitor Banks
1056 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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