Line Differential Protection, 3 Or 6 Ct Sets L3Cpdif, L6Cpdif; Example Of Application On A Conventional Two-Terminal Line - ABB RED670 Product Manual

Line differential protection RED670 ANSI
Customized
Product version: 1.2

Line differential protection, 3 or 6 CT sets L3CPDIF, L6CPDIF

(87L)
Line differential protection applies the Kirchhoff's law and
compares the currents entering and leaving the protected multi-
terminal circuit, consisting of overhead power lines, power
transformers and cables. It offers phase-segregated true
IED
ANSI05000039 V2 EN
Figure 1.

Example of application on a conventional two-terminal line

The six terminal versions are used for conventional two-terminal
lines with breaker-and-a-half circuit breaker arrangements in
10
Protected zone
Communication Channel
current differential protection with high sensitivity and provides
phase selection information for single-pole tripping.
The three terminal version is used for conventional two-terminal
lines with or without breaker-and-a-half circuit breaker
arrangement in one end, as well as three terminal lines with
single breaker arrangements at all terminals.
IED
ANSI05000039_2_en.vsd
both ends, as well as multi terminal lines with up to five
terminals.
1MRK505226-BUS D
ABB