A current transformer
is a device used to measure alternating current. For example, in the process of power generation or transmission, the alternating current of different equipment can be converted into the required current of tens of amperes to tens of thousands of amperes. It can not only monitor and measure the current size of these lines, but also Can avoid the danger of high voltage.
In the lines of power generation, transformation, transmission, distribution and power consumption, the currents vary greatly, ranging from a few amperes to tens of thousands of amperes. In order to facilitate measurement, protection and control, it needs to be converted into a relatively uniform current. In addition, the voltage on the line is generally relatively high, such as direct measurement is very dangerous. The current transformer plays the role of current conversion and electrical isolation.
Precautions for using current transformer
1. First of all, current transformers are marked by minus polarity. If the polarity is connected incorrectly, it will not only affect the current measurement value, but also cause a short circuit in the line.
2. When using a current transformer, a grounding point should be set in the secondary circuit to ensure a good connection. Generally, it can be set at the box terminal to avoid the insulation breakdown between the windings and the formation of high voltage and personal safety. In addition, the secondary winding must not be open, otherwise there will be a danger of overheating or high voltage, which will burn out the winding and endanger personal safety.
3. When using a current transformer at last, check the standard value of its rated current. Failure to reach the standard range of use will cause the transformer to burn out. Conversely, a transformer with excessive current cannot be selected, as this will affect its measurement accuracy. It is best to choose and use it according to the specific situation. You can learn more about its installation method and precautions before installation to avoid accidents.