8.2.7
Operation principle
The Four step phase overcurrent protection OC4PTOC is divided into four different
sub-functions, one for each step. For each step
x
, where x is step 1, 2, 3 and 4, an
operation mode is set by
DirModex
:
Off
/
Non-directional
/
Forward
/
Reverse
.
The protection design can be divided in four parts:
•
The direction element
•
The harmonic Restraint Blocking function
•
The four step over current function
•
The mode selection
If VT inputs are not available or not connected, setting parameter
DirModex
shall be left to default value,
Non-directional
.
en05000740-2-en.vsd
Direction
Element
4 step over current
element
One element for each
step
Harmonic
Restraint
Mode Selection
dirPh1Flt
dirPh2Flt
dirPh3Flt
harmRestrBlock
enableDir
enableStep1-4
DirectionalMode1-4
faultState
Element
faultState
I3P
U3P
START
TRIP
IEC05000740 V2 EN
Figure 158:
Functional overview of OC4PTOC
1MRK502052-UEN B
Section 8
Current protection
345
Technical manual
Содержание Relion REG670
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