Transformer protection RET670
RET670 provides fast and selective protection, monitoring
and control for two- and three-winding transformers,
autotransformers, generator-transformer units, phase shifting
transformers, special railway transformers and shunt reactors.
The transformer IED is designed to operate correctly over a
wide frequency range in order to accommodate power
system frequency variations during disturbances and
generator start-up and shut-down.
A very fast differential protection function with settable CT
ratio matching and vector group compensation makes this
IED the ideal solution even for the most demanding
applications. Since RET670 has very low requirements on the
main CTs, no interposing CTs are required.It is suitable for
differential applications with multi-breaker arrangements with
up to six restraint CT inputs. The differential protection
function is provided with 2nd harmonic and wave-block
restraint features to avoid tripping for magnetizing inrush
current, and 5th harmonic restraint to avoid tripping for
overexcitation.
The differential function offers a high sensitivity for low-level
internal faults. The unique and innovative sensitive differential
protection feature of the RET670 provides the best possible
coverage for winding internal turn-to-turn faults, based on the
theory of symmetrical components .
A low impedance restricted earth-fault protection function is
available as a complimentary sensitive and fast main
protection against winding earth faults. This function includes
a directional zero-sequence current criterion for additional
security.
Additionally a high impedance differential function is available.
It can be used as restricted earth fault or, as three functions
are included, also as differential protection on
autotransformers, as differential protection for a tertiary
connected reactor, as T-differential protection for the
transformer feeder in a mesh-corner or ring arrangement, as
tertiary bus protection and so on.
Tripping from pressure relief/Buchholz and temperature
devices can be done through the transformer IED where
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