1. Over-tightening of the capacitor mounting screw can damage the capacitor.       

The following are the maximum allowed torques for capacitors mounting.

C700T M8

C700T M6

C500T

CSM Type

CSP Type

Model

10Nm

5Nm

15Nm

15Nm

5Nm

(Mmax (Nm

 

2. When mounting several capacitors in parallel, current collecting must be done in such a way that no one of the capacitors will be in the magnetic field of the current of other capacitors. See pictures below..     Conduction Cooled capacitors have to be mounted with a thermal conductive paste in the interface between the capacitor and the bus bar. Paste could be the same as the paste that is used for mounting IGBT’s. The paste does not have to be electrically conductive. The paste improves the heat removal efficiency without affecting the electrical current.


3.  Bus bars for CSP / CP / CPRI / C500T capacitors must be thin and flexible. We recommend using 2mm thick copper to ensure proper flexibility. The flexibility ensures proper thermal and electrical contact and prevents undesired pulling of the electrodes while mounting. If the above torque does not create proper electrical and thermal contact, it means that the gap between the bus bars is not accurate or that the bus bars are not flat. It is recommended to validate proper installation with a filler gauge. Insufficient contact between capacitor and busbar will result in cool outlet water and cool busbar while the capacitor is overheating.

4.  Mounting a CSM capacitor on the top of another CSM capacitor is absolutely not recommended.  It causes an overheating of the upper capacitors.

5.  Both sides of a Conduction Cooled capacitor must be connected to water cooled bus bar.

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Celem Passive components Ltd.

Celem Passive Components Ltd.

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