4.4.4.10
Technical revision history
Table 466: NSPTOV Technical revision history
Technical revision
Change
B
Internal change
C
Internal improvement.
D
Internal improvement.
4.4.5
Positive-sequence undervoltage protection PSPTUV
4.4.5.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Positive-sequence undervoltage
protection
PSPTUV
U1<
47U+
4.4.5.2
Function block
Figure 219: Function block
4.4.5.3
Functionality
The positive-sequence undervoltage protection function PSPTUV is used to detect
positive-sequence undervoltage conditions. PSPTUV is used for the protection of
small power generation plants. The function helps in isolating an embedded plant
from a fault line when the fault current fed by the plant is too low to start an
overcurrent function but high enough to maintain the arc. Fast isolation of all the
fault current sources is necessary for a successful autoreclosure from the network-
end circuit breaker.
The function starts when the positive-sequence voltage drops below the set limit.
PSPTUV operates with the definite time (DT) characteristics.
The function contains a blocking functionality. It is possible to block function
outputs, the definite timer or the function itself, if desired.
4.4.5.4
Operation principle
The function can be enabled and disabled with the
Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of PSPTUV can be described using a module diagram. All the modules
in the diagram are explained in the next sections.
Protection functions
1MRS758755 C
444
REC615 & RER615
Technical Manual
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