What is CT monitoring?
CT Monitoring. Current transformers or (CT) measures alternating current (AC) power. These sensors are best for measuring the generation or consumption of an entire building. The sensors work similar to nerve endings of the human body. They send information back to the controller.
What is the function of CT?
A Current Transformer (CT) is used to measure the current of another circuit. CTs are used worldwide to monitor high-voltage lines across national power grids. A CT is designed to produce an alternating current in its secondary winding that is proportional to the current that it is measuring in its primary.
How are CT sensors used in a circuit?
CT sensors, also known as current transformers or current sensors, are devices that measure the current running through a wire by using the magnetic field to detect the current and generate a proportional output. CT sensors can be used to measure both AC (Alternating current) and DC (Direct current) of a circuit.
What is the current output ratio of a CT sensor?
Normally, this ratio is written in terms of currents in Amps e.g. 100:5 (for a 5A meter, scaled 0 – 100A). The ratio for the CT above would normally be written as 100:0.05. A “current output” CT needs to be used with a burden resistor. The burden resistor completes or closes the CT secondary circuit.
Why does my CT sensor have no output?
The primary winding of the CT is the wire carrying the current you want to measure. If you clip your CT around a two or three core cable that has wires carrying the same current but in opposite directions, the magnetic fields created by the wires will cancel each other, and your CT will have no output.
What happens to the winding of a CT sensor?
The primary winding of the CT is the wire carrying the current you want to measure. If you clip your CT around a two or three core cable that has wires carrying the same current but in opposite directions, the magnetic fields created by the wires will cancel each other, and your CT will have no output. [3] & [4]