What is a control transformer?
The control transformer is a device used to transform or "grading" of the high voltage of the main circuit to the lower voltage, which is then used to control control or switching components of the main circuit. These devices are commonly used in industrial starting circuits, where the main circuit voltage is not suitable for use in the control circuit and where separate feed for the control circuit would not be practical. For example, on a starter panel designed to start a 500 volt electric motor, contactor and relay used to turn on or off the engine, they would usually use electromagnetic coils evaluated for a much lower voltage. To deliver this voltage without the need for a separate power supply, the power supply is clicking on the main coming 500 in the feed and undergoing a control transformer, which would then add a lower voltage of the control circuit.
heavy electric machines that start automatically notBO, at a distance, uses contactors that rely on the electromagnetic power to close and start the machine. This force is formed by an electric coil located in the center of the laminated steel core. These coils are usually designed to work at relatively low voltages, from 110 volts to 12 volts. Since these machines themselves usually run on a much higher voltage, it creates the need for separate administration of the control voltage. Instead of having to start separate cables or install other bus sets, it is much easier to use the main circuit voltage and put it down by the control transformer to the appropriate control voltage.
The low voltage of the control circuit is used for various reasons, including the fact that parts of the control circuit include the buttons in the remote control room, the startor panel door and the machine itself. It would not be wise to have high voltages in these applications for obvious security reasons. Is also undesirable to have a dayEssely wrapped control cabling, which carries very high voltage inside the starting panel. For these reasons, a lower voltage in control circuits is usually used.
Another advantage of using the control transformer is inherent stability of the voltage supplied from the transformer and its ability to handle extreme peaks in demand. When the Start button on the engine starter is pressed and the coil contactor is disrupted, it is very short (usually 30 to 50 milliseconds) in the current demand known as the "predominant current". This peak can exceed 10 times the normal current and transformers process these peaks more efficiently than conventional power supply.
The use of a control transformer to control the power supply allows the use of a lower, more safer and more efficient voltage of the control circuit in high -work applications. Excellent characteristics of current handling for the transformer supplied power also cause more efficient power supply. And finally, the use of lower voltages in the control obsWater allows much safer use of workers using the stop and start buttons in a dangerous environment.