Looking for variable frequency power supply.
Looking for variable frequency power supply.
(OP)
I'm looking for a Variable Frequency / Variable Voltage Power Supply to test an old electromechanical relay used in a generator protection scheme. The relay requires voltages between 0-69VAC at 0-60Hz. Since the relay is an old solenoid type electromechanical relay has a large coil and armature that requires a significant VA to operate. I try testing the relay with a wave(function) generator type with no success. The supply did not have enough VA output to operator the relay. Anyone have any suggestions for a variable frequency power supply for this application. A fairly light and portable unit would be preferable due to the mobile nature of the testing.






RE: Looking for variable frequency power supply.
RE: Looking for variable frequency power supply.
RE: Looking for variable frequency power supply.
If standard relays testers are not applicable.
Maybe ( VFD duys, please don't LOL on me
Regards.
Slava
RE: Looking for variable frequency power supply.
Always good to state that you've tried the obvious and why it didn't work for you. You could well be surprised how often the obvious hasn't been tried.
RE: Looking for variable frequency power supply.
Pacific Power have an excellent range of variable frequency, variable voltage sources. Their products occasionally pop up on ebay, and some of the larger rental outfits have the smaller types on their books. http://www.pacificpower.com/products/index.html
You'll probably find it is less trouble to rent a larger relay test set.
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If we learn from our mistakes I'm getting a great education!
RE: Looking for variable frequency power supply.
I think the 40 HZ is based on a limitation of older equipments that have still a transformer based design. Most modern test sets have MOSFET amplifiers, although there are limitations on the available output powers.
As you mentioned this was generator protection, I wonder why it is needed to go much below 40Hz, especially for e/m technology - unless I miss something in your application.
RE: Looking for variable frequency power supply.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...