ABB RELION REX640 Technical Manual page 488

Protection and control

Hide thumbs Also See for RELION REX640:

Table of Contents

Protection functions

the voltage of the faulty phase decreases and the corresponding capacitance is

discharged to earth (→ discharge transients). At the same time, the voltages of

the healthy phases increase and the related capacitances are charged (→ charge

If the fault is permanent (non-transient) in nature, only the initial fault transient

in current and voltage can be measured, whereas the intermittent fault creates

repetitive transients.

Figure 277: Example of earth-fault transients, including discharge and charge

transient components, when a permanent fault occurs in a 20 kV network in phase C

INTRPTEF Input signals

Table 557: INTRPTEF Input signals

INTRPTEF Output signals

Table 558: INTRPTEF Output signals

1MRS759142 F

Residual current

Residual voltage

Block signal for acti-

vating the blocking

Block signal for EF to indicate

opposite direction peaks

Technical Manual