In terms the duration the earth fault the following applies:
– terd TEW
If the regulator was tuned when the earth fault occurred and the zero sequence
voltage returned its initial value within the transient earth fault time, as-
sumed that the P-coil successfully extinguished the arc. The P-coil
does not have readjusted.
– terd TEW
If the earth fault lasts longer than the transient earth fault time, might neces-
sary switch off the lines order solve the earth fault. new search process always started the end -
earth fault even the earth fault time smaller than the set transient earth fault time TEW. This probably happened
without adjusting the P-coil and without switching off the line sections.Page 106 Detailed description REG-DP/ REG-DPA parameters
We take care it. ensure that the P-
coil set the right value, search started even the zero sequence voltage
has returned its initial value.
Default settings: 7s
TEW 7s
.
If the regulator searching for new resonance point when the earth fault occurs, the
search immediately aborted
