ABB RELION 620 Series Technical Manual page 668

Section 4
Protection functions
4.5.6
4.5.6.1
4.5.6.2
4.5.6.3
4.5.6.4
662
Negative-sequence overvoltage protection NSPTOV
Identification
Function description
Negative-sequence overvoltage
protection
Function block
GUID-F94BCCE8-841F-405C-B659-3EF26F959557 V1 EN
Figure 335: Function block
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.
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.
GUID-0014077D-EEA8-4781-AAC7-AFDBAAF415F4 V1 EN
Figure 336: Functional module diagram
IEC 61850 IEC 60617
identification identification
NSPTOV U2>
1MRS757644 F
ANSI/IEEE C37.2
device number
47O-
620 series
Technical Manual