Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Any Ideas ??????????
"WJF" wrote in message ... I am trying to locate or help with a circuit that will monitor the current on a mains cable and sound a short alarm should the current change. The basic idea is for remote monitoring of a set of PIR controlled security lights up to 10 seperate units at 500W each. I don't want to run a seperate cable for each sensor so I thought this could be one solution. Any help or ideas would be apreciated thanks for reading this post I would start with a current transformer. One of the feed legs passes through the center of the CT then the secondary of the CT goes to the monitoring circuit which could be as simple as a current relay. A more accurate circuit could be made using a suitable load resistor on the secondary and measuring the voltage drop across the resistor, the amplitude of the voltage corresponds to the load current. A simple comparator circuit could determine the alarm point. Just remember to ALWAYS LOAD THE SECONDARY! An open CT secondary will produce high voltages that can destroy both the CT and anyone in its path!!! |
#2
|
|||
|
|||
Any Ideas ??????????
I am trying to locate or help with a circuit that will monitor the current
on a mains cable and sound a short alarm should the current change. The basic idea is for remote monitoring of a set of PIR controlled security lights up to 10 seperate units at 500W each. I don't want to run a seperate cable for each sensor so I thought this could be one solution. Any help or ideas would be apreciated thanks for reading this post |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Chain tensioner ideas | Metalworking | |||
Any Ideas For Organizing A Contractors Work Van? | Woodworking | |||
question on air compressors and Xmas gift ideas | Woodworking | |||
question on air compressors and other xmas gift ideas | Woodworking | |||
Ideas for fixing up driveway | UK diy |