Negative-Sequence Overvoltage Protection Nsptov - ABB RELION REC615 Technical Manual

Protection functions
4.4.3.10 Technical revision history
Table 458: ROVPTOV Technical revision history
Technical revision
B
C
D
4.4.4

Negative-sequence overvoltage protection NSPTOV

4.4.4.1 Identification
Function description
Negative-sequence overvoltage
protection
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
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.
440
Change
Added a setting parameter for the "Measured
Uo" or "Calculated Uo" selection
Internal improvement
Internal improvement
IEC 61850 IEC 60617
identification identification
NSPTOV U2>
Operation setting. The
1MRS758755 C
ANSI/IEEE
C37.2 device
number
47O-
REC615 & RER615
Technical Manual