Incoming Feeder, High H02; Features - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
11.2.
11.2.1.
172
Protection Relay
Technical Reference Manual, Standard Configurations

Incoming feeder, High H02

Features

This application example describes an incoming feeder to a single busbar with
parallel incoming feeders including:
• directional overcurrent protection
• non-directional overcurrent protection
The network is either compensated earthed or isolated. The directional overcurrent
protection is used because of the parallel incoming 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 current transformers and
the residual voltage is measured with a set of voltage transformers in an open-delta
connection. Phase-to-phase voltage measurements are established with voltage
transformers.
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Application Example 9
REX 521 H02
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