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IC697CPM790-FD Gas turbine module

Pick-up ratio v The pick-up ratio "v" is decisive for the stability of the protection during through-faults. This is the section of the operating characteristic for restraint currents higher than 1.5 IN. The value of "v" defines the pick-up current ID for a restrain current IH in the moderately sloped region of the operating characteristic. In the case of generator differential protection, "b" has a fixed setting of 1.5 (compare this with Figures 3.5.2.2 and 3.5.2.3 for transformer differential protection). The "v" setting should be low enough to make the protection sensitive to faults when load current is flowing without maloperating during through-faults. A typical setting is v = 0.25. A higher setting v = 0.5 is chosen in cases where the transient behaviour of the c.t's during through-faults can cause large differential currents. This is normally the result of under-sized c.t's or widely differing c.t. burdens. Typical settings: g-Setting 0.1 IN v-Setting 0.25

Transformer differential (Diff-Transf) 

A. Application Differential protection of two and three-winding power transformers and generator/transformer units. B. Features
non-linear current-dependent tripping characteristic (see Fig. 3.5.2.1)
high stability during through-faults and c.t. saturation
short operating times
three-phase measurement
inrush restraint
evaluation of the ratio of 2nd harmonic to fundamental
detection of the largest phase current
detection of energised transformers using the load current
compensation for group of connection
compensation for current amplitude (c.t. ratio)
measurement for three-winding transformers:
comparison of the greatest current with the sum of the currents of the other two windings (per phase measurement)
suppression of DC off-set
suppression of harmonics C. Inputs and outputs I. C.t./v.t. inputs:
current (2 or 3 sets of 3 inputs) II. Binary inputs:
blocking III. Binary outputs:
tripping
R phase trip
S phase trip
T phase trip