Tap changer position transmitter
Tap changer position transmitter
(OP)
Hi....
I have a transformer installed with an MR tap changer. The position of the tap changer is measured by resistance. I'd like to take the resistance measurement and convert to 4...20mA for input to the control system for display purpose. Any consideration I should have for selecting such a resistance transmitter? Any recommended types to use?
Rgds,
Calvin
I have a transformer installed with an MR tap changer. The position of the tap changer is measured by resistance. I'd like to take the resistance measurement and convert to 4...20mA for input to the control system for display purpose. Any consideration I should have for selecting such a resistance transmitter? Any recommended types to use?
Rgds,
Calvin






RE: Tap changer position transmitter
I suggest using an optic encoder with a digital output on the insulated shaft before going into oil if possible.
I tried using one on a 34.5Kv voltage regulator 33 positions, feeding a 76 Mva Arc Furnace Xfmr for the furnace manual control only. The old way was a bidirectional pulse counter that was never correct. The operator had to always look at the voltage meters, when the tap changer was changing manually about 300-400 times per day. When the furnace controls were automated in 1990 with A-B PLC-5, I used the optic encoder for controlling the tap motor along with the positive mechanical locking device on the tap changer. I do not remember the name of the manufacture of the optic encoder.
Hope this helps and good luck!
Dave
RE: Tap changer position transmitter
Regards
Marmite
RE: Tap changer position transmitter
RE: Tap changer position transmitter