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t s B TD

ipickup

= + ×

æ ö

ç ÷

æ ö

ç ÷

è ø

EQUATION1722 V1 EN-US (Equation 38)

Further description can be found in the technical reference manual.

tPRCrvx, tTRCrvx, tCRCrvx: Parameters for user programmable of inverse reset time

characteristic curve. Further description can be found in the technical reference

manual

8.4.3.6 Line application example

M15282-184 v8

Four step residual overcurrent protection can be used in different ways. Below is

described one application possibility to be used in meshed and effectively grounded

systems.

The protection measures the residual current out on the protected line. The protection

function has a directional function where the polarizing voltage (zero-sequence

voltage) is the polarizing quantity.

The polarizing voltage and current can be internally generated when a three-phase set

of voltage transformers and current transformers are used.

Section 8 1MRK 511 401-UUS A

Current protection

178 Bay control REC670 2.2 ANSI

Application manual

ABB rec670 Applications Manual

Other manuals for ABB rec670