ABB Relion 670 Series Technical Reference Manual page 346

Line differential protection ansi

Hide thumbs Also See for Relion 670 Series:

Table of Contents

Impedance protection

ANSI00000545 V3 EN

Composition on non-directional phase selection signals

Composition of the directional (forward and reverse) phase selective signals is

presented schematically in figure

as a condition for the correct phase selection in order to secure a high phase selectivity

for simultaneous and evolving faults on lines within the complex network

configurations. Internal signals DFWLn and DFWLnLm present the corresponding

directional signals for measuring loops with phases Ln and Lm. Designation FW

(figure 113) represents the forward direction as well as the designation RV (figure 112)

represents the reverse direction. All directional signals are derived within the

corresponding digital signal processor.

presents additionally a composition of a PHSELZ output signal, which is

created on the basis of impedance measuring conditions. This signal can be configured

to PHSEL functional input signals of the distance protection zone and this way

influence the operation of the phase-to-phase and phase-to-ground zone measuring

elements and their phase related pickup and tripping signals.

and figure 113. The directional criteria appears

1MRK505222-UUS C

ANSI00000545-3-en.vsd

Technical reference manual

Relion red670