1. 650 series overview
The 650 series IEDs provide optimum 'off-the-
shelf', ready-to-use solutions. It is configured
with complete protection functionality and
default parameters to meet the needs of a
wide range of applications for generation
transmission and sub-transmission grids.
The 650 series IEDs include:
• Complete ready-made solutions optimized
for a wide range of applications for
generation, transmission and sub-
transmission grids.
• Support for user-defined names in the local
language for signal and function
engineering.
• Minimized parameter setting based on
default values and ABB's new global base
value concept. You only need to set those
parameters specific to your own
application, such as the line data.
• GOOSE messaging for horizontal
communication.
• Extended HMI functionality with 15
dynamic three-color-indication LEDs per
page, on up to three pages, and
configurable push-button shortcuts for
different actions.
• Programmable LED text-based labels.
• Settable 1A/5A -rated current inputs.
2. Application
RET650 provides fast and selective
protection, monitoring and control for two-
and three-winding transformers,
autotransformers, generator-transformer units
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 automatic CT ratio matching and vector
group compensation, makes this IED the
ideal solution even for the most demanding
applications. Since RET650 has very low
requirements on the main CTs, no
interposing CTs are required. 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 RET650 provides the
best possible coverage for winding internal
turn-to-turn faults, based on well-known
theory of symmetrical components .
Low impedance restricted earth-fault
protection function are available as
complimentary sensitive and fast main
protection against winding earth faults. This
function includes a directional zero-sequence
current criterion for additional security.
Tripping from Pressure relief/Buchholz and
temperature devices can be done through the
transformer IED where pulsing, lock-out
contact output and so on, is performed. The
binary inputs are heavily stabilized against
disturbance to prevent incorrect operations at
for example, dc system capacitive discharges
or DC earth faults.
Versatile phase, earth, negative and zero
sequence overcurrent functions, which can be
made directional, provide further alternative
backup protection. Thermal overload with
two time-constants, volts per hertz, over/
under voltage are also available.
A built-in disturbance and event recorders
provide valuable data to the user about status
and operation for post-fault disturbance
analysis.
Breaker failure protection allows high speed
back-up tripping of surrounding breakers.
Transformer protection RET650
1MRK 504 127-BEN -
Product version: 1.1
Issued: February 2011
Revision: -
ABB
3
