ABB REX 521 - Outgoing Feeder, Basic B02; Features

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1MRS751802-MUM

REX 521

163

Protection Relay

Technical Reference Manual, Standard Configurations

Fig. 9.3.5.-1 Phase overcurrent blocking signal overview diagram for the first

three application examples with trip signals from the different

overcurrent stages

9.4. Outgoing feeder, Basic B02

9.4.1. Features

This application example describes an outgoing feeder of a single busbar including:

• Auto-reclosure function

• Overcurrent protection

• Non-directional earth fault protection

• Phase discontinuity protection

• Thermal overload protection for cable/line

The network is either resistance or solidly earthed. Three-phase current

measurement is established with a set of current transformers and the neutral current

is measured in a residual connection.

3I>

3I>>

3I>>>

3I>

3I>>

3I>>>

3I>

3I>>

3I>>>

REX521

START 3I>>

TRIP

Application

example 1

(8.1.)

Application

example 3

(8.3.)

Application

example 2

(8.2.)

PhaseOverCurr

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