tSOTF: the drop delay of ZCVPSOF is, by default, set to 1.0 seconds, which is suitable
for most applications.
tDLD: The time delay for activating ZCVPSOF by the internal dead-line detection is,
by default, set to 0.2 seconds. It is suitable in most applications. The delay shall not be
set too short to avoid unwanted activations during transients in the system.
Mode: The operation of ZCVPSOF has three modes for defining the criteria for
tripping. The setting of Mode is, by default, UILevel, which means that the tripping
criterion is based on the setting of IPh< and UPh<. The choice of UILevel gives a
faster and more sensitive operation of the function, which is important for reducing the
stress that might occur when energizing onto a fault. However
, the voltage recovery
can be slow in some systems when energizing the line. Therefore, if the timer
tDuration is set too short, ZCVPSOF can interpret this as a fault and release a trip.
When Mode is set to Impedance, the operate criterion is based on the BC input (breaker
closing), which can be the start of the overreaching zone from the impedance zone
measurement or a tOperate-delayed START_DLYD input. A nondirectional output
signal should be used from an overreaching zone. The selection of the Impedance
mode gives increased security.
When Mode is set to UILvl&Imp, the condition for tripping is an ORed between
UILevel and Impedance.
tDuration: The setting of the timer for the release of UILevel is, by default, 0.02
seconds, which has proven to be suitable in most cases from field experience. If a
shorter time delay is to be set, it is necessary to consider the voltage recovery time
during line energization.
tOperate: The time delay for the START_DLYD input to activate TRIP when Mode is
set to Impedance or UILvl&Imp is, by default, set to 0.03 seconds.
8.19 Phase preference logic PPLPHIZ
SEMOD151920-1 v2
8.19.1 Identification
SEMOD151937-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase preference logic PPLPHIZ - -
Section 8 1MRK 504 163-UUS A
Impedance protection
490 Transformer protection RET670 2.2 ANSI
Application manual
To Next Page
Loading...
