Functionality - ABB REG650 Technical Manual

Section 9
Voltage protection
9.4.2
9.4.3
9.4.4
272

Functionality

When the laminated core of a power transformer or generator is subjected to a
magnetic flux density beyond its design limits, stray flux will flow into non-laminated
components not designed to carry flux and cause eddy currents to flow. The eddy
currents can cause excessive heating and severe damage to insulation and adjacent
parts in a relatively short time. The function has settable inverse operating curves and
independent alarm stages.
Function block
OEXPVPH (24)
V3P* TRIP
BLOCK BFI
RESET ALARM
ANSI09000008-1-en.vsd
ANSI09000008 V1 EN
Figure 125: OEXPVPH (24) function block
Signals
Table 155: OEXPVPH (24) Input signals
Name Type
V3P GROUP
SIGNAL
BLOCK BOOLEAN
RESET BOOLEAN
Table 156: OEXPVPH (24) Output signals
Name Type
TRIP BOOLEAN
BFI BOOLEAN
ALARM BOOLEAN
Default Description
- Three phase group signal for voltages
0 Block of function
0 Reset of function
Description
Common trip signal
General pickup signal
Overexcitation alarm signal
1MRK 502 043-UUS B
Technical Manual