POLIMET POWER FACTOR CORRECTION CAPACITORS

Capacitor Selection

When applying static correction to induction motors, it is important not to over correct the motor. The best method of static correction is to select the correction based on the magnetizing current of the motor. The capacitive current should be no more than 80% of the magnetizing current. If you do not know the magnetizing current, you can measure the open shaft current of the motor which is essentially equal to the magnetizing current.

Use the magnetizing (open shaft) current to select the correction from table 1.

example. Motor KW = 18KW. Magnetizing current = 13 Amps

From table, power factor correction = 7.2 KVAR.

With static correction, it is best to undersize rather than oversize.

If the magnetizing current is not known, and the open shaft current can not be measured, use table 2. This should be the last resort and can be much too low, especially with submersible pumps.

Technical Description

Selfhealing capacitors with low loss metallized polypropylene dielectric. Capacitors mounted in cylindrical aluminium cans with M12 stud for fixing and earthing and fitted internally with discharge resistors. Connection is made through Faston terminals (POLT version) or by terminal block (POLB version). These capacitors are specially suitable for the individual compensation of small inductive loads such as induction motors. These capacitors should not be used for compensation of electronic loads such as VSDs.

POLT40010 
POLT40015
POLT40020

1.0
1.5
2.0

400
400
400

1.4
2.2
2.9

50 x 158
50 x 158
50 x 158

0.4
0.4
0.4

POLB40030
POLB40040
POLB40050
POLB40075
POLB40100
POLB40125
POLB40150
POLB40200
POLB40250

3.0
4.0
5.0
7.5
10.0
12.5
15.0
20.0
25.0

400
400
400
400
400
400
400
400
400

4.3
5.8
7.2
10.9 
14.5
18.0
21.7
18.9
36.1

85 x 210
85 x 210
85 x 210
85 x 280
85 x 280
85 x 280
85 x 280
110 x 280
110 x 280

0.9
1.0
1.0
1.8
1.8
1.8
1.8
2.2
2.2