ABB Relion REC615 - Negative-Sequence Overvoltage Protection NSPTOV

4.4.3.10 Technical revision history
Table 458: ROVPTOV Technical revision history
Technical revision Change
B Added a setting parameter for the "Measured
Uo" or "Calculated Uo" selection
C Internal improvement
D Internal improvement
4.4.4 Negative-sequence overvoltage protection NSPTOV
4.4.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Negative-sequence overvoltage
protection
NSPTOV U2> 47O-
4.4.4.2 Function block
Figure 217: Function block
4.4.4.3 Functionality
The negative-sequence overvoltage protection function NSPTOV is used to detect
negative sequence overvoltage conditions. NSPTOV is used for the protection of
machines.
The function starts when the negative sequence voltage exceeds the set limit.
NSPTOV 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.
4.4.4.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of NSPTOV can be described using a module diagram. All the modules
in the diagram are explained in the next sections.
Protection functions
1MRS758755 C
440 REC615 & RER615
Technical Manual