ABB 615 Series - Page 267

The voltage slope characteristic is achieved by assigning different values to Voltage high
limit and Voltage low limit. The effective pickup value calculation is based on the
equations.
Voltage level
Effective pickup value (I> effective)
V < Voltage low limit Pickup value low
V ≥ Voltage high limit Pickup value
If Voltage low limit ≤ V < Voltage high limit,
I effective A
A I
C D
C V> = −
− >
−






⋅ −
( )






( )
GUID-4236A6A6-504B-4A1B-B91D-263066A187B4 V1 EN (Equation 6)
A
set Pickup value low
I> set Pickup value
C set Voltage high limit
D set Voltage low limit
Here V represents the measured input voltage. The voltage slope characteristic is
graphically represented.

Voltage
low limit
Pickup value
V
Voltage
high limit
Starting
current
Pickup value low
GUID-E3667B8C-7352-4970-BE53-56EA702DAA47 V1 EN
Figure 129: Effective pickup value or voltage slope characteristic
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 261
Technical Manual