ABB RELION 620 Series Technical Manual page 314

Section 4
Protection functions
308
Usually, the V/f characteristics are specified so that the ratio is 1.00 at the
nominal voltage and nominal frequency. Therefore, the value 100 percent
for the setting Voltage Max Cont is recommended.
If the Voltage Max Cont setting is 105 percent, the excitation level M of the machine is
calculated with the equation.
12490
Excitation level M =
11000
GUID-3422B6EB-4564-4EFD-B60A-50CB18850054 V1 EN
Example 3
In this case, the function operation is according to IDMT. The Operating curve type
setting is selected as "OvExt IDMT Crv2". The corresponding example settings for the
IDMT curve operation are given as: Pickup value = 110%, Voltage Max Cont = 100%,
Time multiplier = 4, Maximum trip time = 1000000 milliseconds and Minimum trip time =
1000 milliseconds.
49 98 .
= 1 0818 .
⋅ 1 05 .
50
1MAC504801-IB E
(Equation 16)
620 series ANSI
Technical Manual