Transformer capacitor replacement pictures

What happens if a capacitor is replaced in a power transformer?

When a capacitor (C1) is replaced in a power transformer with another capacitor stack connected in series, the large voltage drop occurs across the stack of capacitors that replaced the first capacitor, resulting in a comparatively small voltage drop across the second capacitor (C2) and the secondary terminal.

How much capacitance does an IF transformer have?

In some IF transformers there are integrated capacitors internal to the enclosure. These capacitors are parallel to the primary and secondary of the coils. The range of capacitance, from what I have seen, range from about 70pf up to 250 pf. After years of service, the silver becomes tarnished where the spring metal contacts touch the silver.

How do you identify a transformer or capacitor?

In general, it is easy to identify a transformer or capacitor by analyzing the data on its identification plates: The insulating liquid is identified by its commercial name: Inerten, Clophen, Pyralène, Arochlor, Apirolio, which are the most common brands found in Latin American transformers.

Should I Mark a transformer if the schematic is not coded?

If your schematic is not coded, or the transformer has no marks, it's a good idea to mark the transformer, and your schematic, and possibly even the chassis (for orientation) so as to make the reassembly easier. (Especially if you have to wait a while for the capacitors, and have a tendancy to forget like I do!) pulled apart.

How do I find the value of a silver mica capacitor?

Find the value on the schematic or measure the capacitor value with a capacitor tester. See images below. I also have marked which coil (upper or lower) is connected to which contacts. This is in the event that the coils must be removed from the base. It also aids in determining where to connect the replacement silver mica capacitors.

How do I re-install a transformer?

Document, take pictures, sketch a diagram of the IF connections. Mark a reference point on the base of the IF can so you can re-install the transformer in its proper orientation. Often there is a spot of red paint already by a contact. Then desolder and remove the connecting wires. Remove the metal cover.