Capacitor Reformer Schematic

Once the reforming process is complete switch off the reforming supply discharge the capacitor with a resistor not a short circuit disconnect it from the reforming supply and reconnect it to its original circuit. This wonderful antique tests everything one can test on a capacitor and provides a special re forming circuit.

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New electrolytic capacitor reformer and capacitor leakage tester project you can copy the 11 magazine front panel artwork and either laminate it then cut a piece of 3mm clear acetate sheet widely available in the uk for glazing i assume also in the us to cover and protect the laminated panel as its a bit flimsy otherwise.

Capacitor reformer schematic. A friend of mine lent me a sprague model to 5 tel ohmike capacitor analyzer. Design of a practical capacitor reformer the full circuit for a capacitor reformer is hown in fig2. The capacitor bank is reformed the bus capacitors may fail destroying the drive.

If an item of equipment with capacitors in this state. This deterioration takes the form of reduced capacitance and greatly increased leakage current. Switch sw2 to c switch sw1 to charge observe the leakage current read on the meter 1 volt 1 ma.

Select a voltage of about 25 of the capacitors voltage rating and monitor with sw2 at a. High voltage electrolytic capacitor reformer. The bonitron m3628pcf is ideal for reforming capacitors providing a portable variable voltage dc power supply capable of quickly charging capacitor banks to any voltage within its range and holding them at that voltage for any length of time desired.

The high voltage electrolytic capacitors in valve equipment tend to deteriorate if the equipment is not used for an extended period. Say we have a 200uf 450v smoothing capacitor and its drawing 10ma at 400v its really pretending to be a 40k resistor and its going to start to dissipate power power voltage x current 400 x 0010 4 watts and not only that but its probably not being much of a capacitor either. In some cases the capacitor will become virtually short circuit.

Set sw1 to discharge. A simple dc supply using a voltage doubler rectifier arrangement turns a 250v ac output of the transformer into approximately 520 volts dc across c1 and c2. This deterioration takes the form of reduced capacitance and greatly increased leakage current.

As soon as any further inspections or tests on the equipment are completed then it may be powered up. The power rating must be sufficient to withstand the capacitor being short circuit. This power is going to be dissipated as heat.

Which has been adapted from the radio constructor article already mentioned. The high voltage electrolytic capacitors in valve equipment tend to deteriorate if the equipment is not used for an extended period. The reformer circuit is designed so that no damage can occur if the capacitor connected to it is short circuit or has very high leakage or is even connected back to front ie with reverse polarity.

If you should ever run across such an instrument collect it if at all possible.

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