Sumary:
Stray 50Hz voltages that upset cows in the dairy have in the past been rectified by ensuring adequate power supply and earthing. The more recent installation of Variable Speed Drives (VSDs) on the various cowshed electric motors has created much higher frequency currents with different characteristics that cause similar problems with stock. The stray voltages are difficult to detect but relatively easy to rectify. A draft Code of Practice for the supply, installation and operation of variable speed drives, which includes a section on farm dairies, is being prepared by a Ministry of Economic Development working group. Steve Corkill is a member of the group.
Stray 50Hz voltages that upset cows in the dairy have in the past been rectified by ensuring adequate power supply and earthing. The more recent installation of Variable Speed Drives (VSDs) on the various cowshed electric motors has created much higher frequency currents with different characteristics that cause similar problems with stock. The stray voltages are difficult to detect but relatively easy to rectify. A draft Code of Practice for the supply, installation and operation of variable speed drives, which includes a section on farm dairies, is being prepared by a Ministry of Economic Development working group. Steve Corkill is a member of the group.
Corkill Systems Ltd.
5 Tasman St, PO Box 16,Opunake 4616,
Taranaki, New Zealand.
Ph 06 761 7531. Fax 06 761 7336
Freephone 0800 10 7006 NZ ISDN CODE (0064)
Email; info@corkillsystems.co.nz
5 Tasman St, PO Box 16,Opunake 4616,
Taranaki, New Zealand.
Ph 06 761 7531. Fax 06 761 7336
Freephone 0800 10 7006 NZ ISDN CODE (0064)
Email; info@corkillsystems.co.nz
Specialists in Dairy Automation Solutions
Segment on Stray Voltage from the TVNZ "Rural Delivery" Programme 21/5/2011
