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.
Excitation level M
=
⋅
=
12490
49 98
11000
50
1 05
1 0818
.
.
.
GUID-3422B6EB-4564-4EFD-B60A-50CB18850054 V1 EN
(Equation 11)
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.
Section 4
1MRS240050-IB C
Protection functions
258
REF615R
Technical Manual
Summary of Contents for RELION REF615R
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