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4-26
Component Definition and Maintenance
D.C. Link / Fan / Control
Components (cont.)
7000A-UM151E-EN-P - October 2018
e.g. - the capacitor under test is rated at 400 kVAR, 6600V, 50Hz, 29.2 µF.
You are using 200V, 50Hz test power and have recorded the values of
voltage and current for each test as given in the table below.
Phase - Neutral
Test Voltage
Measured Current
Let us calculate the capacitance using the first reading. In this case:
V = 200V, I = 1.87 for L1-N
Xc = V/I = 200/1.87 = 106.95
1
C
=
π
2
1
C
=
2
×
. 3
C
µ
=
29
7 .
Where, f = frequency of the applied voltage.
Similarly, you can calculate the capacitance for the remaining two
measurements for L2-N and L3-N.
L1-N
200V
1.87A
f
Xc
14
×
50
×
106
.
95
F
L2-N
L3-N
200V
200V
1.866A
1.861A
7000 "A" Frame
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