xx05000053_ansi.vsd
352
452
252
152
ANSI05000053 V1 EN-US
three–winding power transformer with two
circuit breakers and two CT-sets on one side
xx05000057_ansi.vsd
552
152
252
352
452
ANSI05000057 V1 EN-US
Autotransformer with two circuit breakers
and two CT-sets on two out of three sides
Figure 32: CT group arrangement
for differential
protection
The setting facilities cover the application of the differential protection to all types of power
transformers and auto-transformers with or without load tap changer as well as shunt reactors
and local feeders within the station. An adaptive stabilizing feature is included for heavy through-
fault currents.By introducing the load tap changer position, the differential protection pick-up can
be set to optimum sensitivity thus covering internal faults with low fault current level.
Harmonic restraint is included for inrush and overexcitation currents respectively, cross-blocking
is also available. Adaptive stabilization is also included for system recovery inrush and CT
saturation during external faults. A high set unrestrained differential current protection element is
included for a very high speed tripping at high internal fault currents.
Included is an sensitive differential protection element based on the theory of negative sequence
current component. This element offers the best possible coverage of power transformer
windings turn to turn faults.
1MRK 502 066-UUS B
Section 6
Differential protection
107
Technical manual
Содержание Relion 670 series
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