Positive, negative and zero sequence overcurrent functions, which can optionally be
made directional and/or voltage controlled, provide further alternative backup
protection. Thermal overload, overexcitation, over/under voltage
and over/under
frequency protection functions are also available.
Breaker failure protection for each transformer breaker allows high speed back-up
tripping of surrounding breakers.
A built-in disturbance and event recorder provides valuable data to the user about
status and operation for post-fault disturbance analysis.
The IED can optionally be provided with full control and interlocking functionality
including a synchrocheck function to allow integration of the main or local back-up
control functionality.
A pole slip protection function is also available in the IED to detect, evaluate, and take
the required action for pole slipping occurrences in the power system. The electrical
system parts swinging to each other can be separated with the line(s) closest to the
centre of the power swing, allowing the two systems to be stable when separated.
Logic is prepared with a graphical tool. The advanced logic capability allows for
special applications such as automatic opening of disconnectors in multi-breaker
arrangements, closing of breaker rings and load transfer logic. Logic can be monitored
and debugged online in real time for testing and commissioning.
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, IOM & SOM) 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.
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.
M11788-3 v10
Communication via optical connections ensures immunity against disturbances.
Section 2 1MRK 504 163-UUS A
Application
44 Transformer protection RET670 2.2 ANSI
Application manual
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