Positive-Sequence Undervoltage Protection Psptuv - ABB RELION REC615 Technical Manual

Protection functions
4.4.4.10 Technical revision history
Table 466: NSPTOV Technical revision history
Technical revision
B
C
D
4.4.5

Positive-sequence undervoltage protection PSPTUV

4.4.5.1 Identification
Function description
Positive-sequence undervoltage
protection
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
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.
444
Change
Internal change
Internal improvement.
Internal improvement.
IEC 61850 IEC 60617
identification identification
PSPTUV U1<
Operation setting. The
1MRS758755 C
ANSI/IEEE
C37.2 device
number
47U+
REC615 & RER615
Technical Manual