Version Changes
MAIN The P634 now allows disconnection of individual ends
by assigning functions to binary signal inputs.
Bug fixing:
●
The measured operating values for the positive
sequence currents are now calculated
independently of the DTOC/IDMT protection
functions.
DIFF The starting condition for the saturation discriminator
has been enhanced by the addition of a further
minimum condition for the restraining quantity with
basic filtering. Without this minimum condition, the
saturation discriminator could be incorrectly triggered
during the test of a characteristic using virtual test
signals in the absence of a preload current.
REF_x Blocking of the REF functions while the DIFF protection
(functional enhancement by ‑611 ‑715) has been
triggered can now be enabled/disabled using setting
parameters.
Furthermore the REF_1: Blocking EXT (019 051),
REF_2: Blocking EXT (019 052) and REF_3:
Blocking EXT (019 053) binary signal input functions
are now available to allow for a more flexible
application of the functions. Since operational
readiness is no longer solely dependent on the device
setting, its state is also signaled:
REF_1: Ready (019 054), REF_2: Ready (019 055)
and REF_3: Ready (019 056), i.e. REF_x enabled AND
NOT blocked.
REF_1 The function has been enhanced so that further ends
can be included into the protection reach, e.g. in
ground differential protection for autotransformers.
CBF_x As an option, the loss of load/undercurrent criterion can
now also be used with the residual current.
The external function startup may now occur either
when only the loss of load/undercurrent criterion is
applied or also with the CB contact position scanning
criterion.
P634
‑308
‑407/408
‑621-720
Release: 2009-07-29
Hardware
No changes.
Diagram
No changes.
Software
P634 A5 P634 Version History
A5-22 P634/EN M/R-42-A // P634‑311‑653
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