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Service Manual for Medium Frequency Sine-wave Filters
2.4.2
Measurements at the capacitor
Unscrew and mark connections of the capacitor at the terminal strip.
The capacity measurement must be executed as follows:
The high-voltage test is made dependent on the insulation tester with the following test
voltages:
2.4.3
Measurement of the insulation strength
The choke can be checked with a high-voltage test on its insulation strength. The test is
done without capacitor.
Unscrew connections of the capacitor at the terminal strip
The high-voltage test is made dependent on the insulation tester with the following test
voltages:
Test voltage phase <-> phase
2.4.4
Connection of the capacitor lines
The capacitor lines must be connected again in accordance with the marking if the tests are
without complaint. The terminals must be tightened with the following tightening torque:
• It is measured between two phases of the delta-connected
capacitors.
• The following capacity value C
C
= 1,5 • C
Meas
• A failure may occur if one of this three measured values
differs to the other.The capacitor must be exchanged in
accordance with chapter 3.
Test voltage phase <-> ground
2,5 kV ac
3,5 kV dc
Terminal strip
WFF 35
WFF 70
WFF 120
WFF 185
WFF 300
±7,5 %
rated
2,5 kV ac
3,5 kV dc
Test voltage phase <-> housing
Tightening torque terminal strip
must result.
Meas
2,5 kV ac
3,5 kV dc
3,0...6,0 Nm
6,0...12 Nm
10...20 Nm
14...31 Nm
25...60 Nm
GB-5
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