Application - ABB Relion 650 Series Product Manual

Transformer protection RET650
Version 2.2

2. Application

The RET650 provides fast and selective protection,
monitoring and control functions for two- and three-winding
transformers, autotransformers, generator-transformer units
and shunt reactors. The IED is designed to operate
correctly over a wide frequency range in order to
accommodate power system frequency variations during
disturbances and generator startup and shutdown.
Apparatus control for 3 circuit breakers is included.
A fast differential protection function with built-in
transformer 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 waveform-blocking 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 internal turn-to-turn winding
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.
Tripping from pressure relief/Buchholz and temperature
devices can be implemented through the IED's binary
inputs, where trip signal conditioning can be performed
(pulsing, lockout, additional logics, etc.). The binary inputs
are thoroughly stabilized against disturbances in order to
prevent incorrect operations due to DC system capacitive
discharges or DC earth faults, for example.
Versatile phase, earth and zero sequence overcurrent
functions with directional capability provide further
alternative backup protections. Thermal overload with two
time-constants and breaker failure protection is also
available.
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A built-in disturbance and event recorder provides valuable
data to the user about status and operation for post-fault
disturbance analysis.
Two pre-configured packages have been defined for the
following applications:
• Single breaker, 2 winding transformer (A01)
• Single breaker, 2/3 winding transformer (A05)
The package is configured and ready for direct use. Analog
and control circuits have been predefined and other signals
need to be applied as required for each application. The
pre-configured IED can be changed and adapted to suit
specific applications with the application configuration tool.
IED supports COMTRADE1999 and COMTRADE2013
formats which can be selected in Parameter Setting Tool
(PST) of PCM600 or via LHMI.
The IED can be used in applications with the IEC/UCA
61850-9-2LE process bus with up to four Merging Units
(MU). Each MU has eight analogue channels, four current
and four voltages. Conventional input transformer module
and Merging Unit channels can be mixed freely in your
application.
Forcing of binary inputs and outputs is a convenient way to
test wiring in substations as well as testing configuration
logic in the IEDs. Basically it means that all binary inputs
and outputs on the IED I/O modules (BOM, BIM and IOM)
can be forced to arbitrary values.
Central Account Management is an authentication
infrastructure that offers a secure solution for enforcing
access control to IEDs and other systems within a
substation. This incorporates management of user
accounts, roles and certificates and the distribution of such,
a procedure completely transparent to the user.
The Flexible Product Naming allows the customer to use an
IED-vendor independent IEC 61850 model of the IED. This
customer model will be used as the IEC 61850 data model,
but all other aspects of the IED will remain unchanged (e.g.,
names on the local HMI and names in the tools). This offers
significant flexibility to adapt the IED to the customers'
system and standard solution.
1MRK 504 172-BEN G
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