Application Examples, High; Incoming Feeder, High H01; Features - ABB REX 521 Technical Reference Manual, Standard Configurations

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11.
11.1.
11.1.1.
Protection Relay
Technical Reference Manual, Standard Configurations

Application examples, High

Incoming feeder, High H01

Features

This application example describes an incoming feeder to a single busbar with
parallel feeders including:
• directional overcurrent protection
• non-directional overcurrent protection
• synchro-check and voltage-check
This application example is an optional solution for the application example 9
(chapter 11.2.), if there is a parallel generator feeder connected to the same busbar.
The network is either compensated earthed or isolated. The directional overcurrent
protection is used because of the parallel feeders. There is no earth-fault protection
included in this application example, because residual voltage-based protection can
be located on the measurement cubicle of the busbar.
The three-phase current measurement is established with Rogowski sensors and the
residual voltage is calculated from phase-to-earth voltages which are measured by
the voltage dividers. Phase-to-phase voltage of the busbar for synchro- and voltage-
check is measured by the voltage transformer.
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Application Example 8
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