tripping scheme with a synchronism check function for manual closing of the low
voltage side breaker. The high voltage breaker is foreseen to always ener
gize the
transformer and be interlocked with an open LV side breaker. High voltage circuit
breaker synchronism check function is optional for system where synchronism check is
required to close the bays/rings.
The differential protection is the main protection function. It provides fast and sensitive
tripping for internal faults. Stabilization against through faults, inrush and
overexcitation are standard features. The function is provided with six stabilized inputs
which allows all CT sets possible with multi-breaker arrangements on several of the
windings to be possible.
Measuring functions for S, P, Q, I, V, PF, f are available for local presentation on the
local HMI and/or remote presentation. The availability of additional analog inputs
allows connection of separate metering cores and a calibration parameter on the
measurement function allows calibration at site to very high accuracy.
Section 3 1MRK 504 163-UUS A
Configuration
64 Transformer protection RET670 2.2 ANSI
Application manual
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