ABB RET670 - Setting Parameters

tIResetn: Reset time for step n if inverse time delay is used, given in s. The default
value is 25 ms.
TDn: Time multiplier for inverse time characteristic. This parameter is used for co-
ordination between different inverse time delayed undervoltage protections.
ACrvn, BCrvn, CCrvn, DCrvn, PCrvn: Parameters to set to create programmable under
voltage inverse time characteristic. Description of this can be found in the technical
reference manual.
CrvSatn: When the denominator in the expression of the programmable curve is equal
to zero the time delay will be infinity. There will be an undesired discontinuity.
Therefore a tuning parameter CrvSatn is set to compensate for this phenomenon. In the
voltage interval Pickup> up to Pickup> · (1.0 + CrvSatn/100) the used voltage will be:
Pickup> · (1.0 + CrvSatn/100). If the programmable curve is used, this parameter must
be calculated so that:
0
100
CrvSatn
B C× - >
EQUATION1448 V1 EN (Equation 403)
HystAbsn: Absolute hysteresis set in % of VBase. The setting of this parameter is
highly dependent of the application. If the function is used as control for automatic
switching of reactive compensation devices the hysteresis must be set smaller than the
voltage change after switching of the compensation device.
3.8.2.3 Setting parameters
Table 126: OV2PTOV (59) Group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
VBase 0.05 - 2000.00 kV 0.05 400.00 Base voltage
OperationStep1 Disabled
Enabled
- - Enabled Enable execution of step 1
Characterist1 Definite time
Inverse curve A
Inverse curve B
Inverse curve C
Prog. inv. curve
- - Definite time Selection of time delay curve type for step 1
OpMode1 1 out of 3
2 out of 3
3 out of 3
- - 1 out of 3 Number of phases required for op (1 of 3, 2 of
3, 3 of 3) from step 1
Pickup1 1 - 200 %VB 1 120 Voltage pickup value (Definite-Time & Inverse-
Time curve) in % of VBase, step 1
Table continues on next page
1MRK504116-UUS C Section 3
IED application
519
Application manual