Version Changes
DIFF The minimum setting value for the characteristic
gradients m1 and m2 have been modified to 0.10
(previously 0.15).
The starting condition for the saturation discriminator
was modified so that the DIFF protection testing may
now be carried out again with conventional test sets
(which do not provide correct transient signals).
Along with the new CTS function, an additional
threshold, (080 000) DIFF: Idiff>(CTS) PSx, is
provided in order to de-sensitize differential protection
in case there is a fault in the CT's secondary circuit. For
more information about this feature please refer to CTS
description.
Bug fixing:
●
In some cases the overreaching inrush
stabilization function did not operate properly. In
addition the signal from the inrush stabilization
was sometimes immediately reset when a
differential protection trip was issued.
REF_x If the new current transformer supervision (CTS)
function is used, the ground fault differential protection
function associated with the faulted end was blocked
when a CT fault was detected. For more information
about this feature please refer to CTS description.
CTS First implementation of a current transformer
secondary wiring supervision which operates fast
enough to prevent differential protection from tripping
under load in case of a CT failure.
This function can only be used if the new processor
board with DSP coprocessor is fitted!
MCM_x The existing measuring-circuit monitoring functions,
based on the phase currents per end, have been
enhanced and can now be used to detect broken
conductors (“broken conductor protection”) on the CTs'
primary sides.
Note: This software version is compatible to all
previous hardware versions.
P634
‑304
‑403/404
‑610
Release: 2006-03-02
Hardware
No changes.
Diagram
No changes.
Software
P634 A5 P634 Version History
A5-8 P634/EN M/R-42-A // P634‑311‑653
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