ABB Relion 670 Series Applications Manual page 124

Hide thumbs Also See for Relion 670 Series:

Table of Contents

Differential protection

Series resistor thermal capacity

The series resistor is dimensioned for 200 W. Preferably, the

always be lower than 200 W to allow continuous activation during testing. If this value is

exceeded, testing should be done with a transient faults.

IEC05000427 V2 EN-US

Figure 50: The high impedance principle for one phase with two current transformer

Protected Object

a) Through load situation

b) Through fault situation

c) Internal faults

1MRK 511 401-UEN Rev. K

SEMOD54734-336 v6

/SeriesResistor should

IEC05000427-2-en.vsd

Bay control REC670

Application manual

Relion rec670