I need help in understanding the mechanism to measure/estimate health of DC contactors and DC relays used in industrial grade power systems. What are the mechanisms and tools used for this purpose ?
Please share links for the material or the material itself.
Thanking in advance.
Hello Ahmad Usman ,
There are only three things of importance with respect to a contactor or a relay: 1) the contact resistance of the closed contacts 2) the resistance of the coil used to pull-in the armature, and 3) the mechanical linkage between the contacts/armature and the stator (the fixed portion made up the coil, its pole piece, etc.). The contact resistance of the closed contacts is the most important thing.
Regards,
Tom Cuff
Dear you can estimate it by using the mechanical linkage between the armature and the stator (the fixed portion made up the coil for measuring the health of the dc relay system.
Hello Ahmad Usman ,
Sorry, I forgot to mention some of the instrumentation you will need. For contact resistance measurements, you will need a milli-ohm meter with Kelvin leads (4-wire measurement with one pair for drive current and one pair for voltage sensing), and a small, portable microscope to visually check the contacts for pitting and material transfer. The resistance of the coils can probably be measured with a normal ohm meter. And the closing and opening times can be measured with an oscilloscope and some fixturing to provide test signals.
Regards,
Tom Cuff
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