How To Calculate The Power Of Capacitors - Alpes Technologies Page 2
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3A Group brand
rEaCTivE COmPENSaTiON Of aSyNCHrONOuS mOTOrS
(COmPENSaTiON aT mOTOr TErmiNalS)
The table below gives, for information purposes
if qc ≤ 90% io 3 u
only, the maximum power of the capacitor that
can be connected directly to the terminals of an
Power supply
asynchronous motor with no risk of self-excitation.
It will be necessary to check in all cases that the
C.1
maximum current of the capacitor does not exceed
90% of the magnetising current (off-load) of the motor.
Qc
M
Maximum power of the
Maximum speed rpm
3±
motor
3000
1500
1000
HP
kW
Max. power in kVAr
11
8
2
2
3
if qc > 90% io 3 u
15
11
3
4
5
20
15
4
5
6
25
18
5
7
7.5
Power supply
30
22
6
8
9
40
30
7.5
10
11
50
37
9
11
12.5
C1
60
45
11
13
14
100
75
17
22
25
150
110
24
29
33
180
132
31
36
38
C2
218
160
35
41
44
M
274
200
43
47
53
3±
Qc
340
250
52
57
63
380
280
57
63
70
Io: motor off-load current
482
355
67
76
86
U: supply voltage
If the capacitor power required to compensate
the motor is greater than the values given in the
above table or if, more generally: Qc > 90% Io 3 U,
compensation at the motor terminals will however
remain possible by inserting a contactor (C.2),
controlled by an auxiliary contact of the motor
contactor (C.1), in series with the capacitor.
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