Monitored Data; Operation Principle - ABB RET650 Technical Manual

Section 8
Current protection
Name
CurrMult_OC2
tDef_OC2
DirMode_OC2
DirPrinc_OC2
ActLowVolt2_VM
Table 127: DNSPTOC Non group settings (basic)
Name
GlobalBaseSel
8.9.6
8.9.7
200
Values (Range) Unit
1.0 - 10.0 -
0.00 - 6000.00 s
Non-directional -
Forward
Reverse
I&U -
IcosPhi&U
Non-directional -
Block
Values (Range) Unit
1 - 6 -

Monitored data

Table 128: DNSPTOC Monitored data
Name
CURRENT
VOLTAGE
UIANGLE

Operation principle

Negative sequence based overcurrent function (DNSPTOC) has two settable current
levels, setting parameters StartCurr_OC1 and StartCurr_OC2. Both features have
definite time characteristics with settings tDef_OC1 and tDef_OC2 respectively. It is
possible to change the direction of these steps to forward, reverse or non-directional
by setting parameters DirMode_OC1 and DirMode_OC2. At too low polarizing
voltage the overcurrent feature can be either blocked or non-directional. This is
controlled by settings ActLowVolt1_VM and ActLowVolt2_VM.
Step Default
0.1 2.0
0.01 0.50
- Non-directional
- I&U
- Block
Step Default
1 1
Type Values (Range)
REAL -
REAL -
REAL -
1MRK 504 135-UEN A
Description
Multiplier for current operate level for step
2 (OC2)
Independent (definite) time delay for step
2 (OC2)
Directional mode of step 2 (non-
directional, forward, reverse)
Measuring on I & U or IcosPhi & U for step
2 (OC2)
Low votlage level action for step 2 (Non-
directional, Block, Memory)
Description
Selection of one of the Global Base Value
groups
Unit Description
A Measured current value
kV Measured voltage value
deg Angle between voltage
and current
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