Current transformer_ring network cabinet special transformer professional manufacturer!
Release time:
Sep 27,2021
Source:
Current transformer is a kind of commonly used equipment. The function is to convert a large primary current into a small secondary current through a certain transformation ratio for protection, measurement and other purposes. For example, a current transformer with a ratio of 400/5 can convert an actual current of 400 amperes into a current of 5 amperes.
So what principle does this current transformer work on?
Especially those who study physics know that it is made by the principle of electromagnetic induction. Sometimes the large current in the circuit cannot be measured directly. The function of the current transformer is to convert a large current into a small current and then measure it. However, the current transformer will be burned in the work, which is a lot of people confused, the following for everyone to analyze the causes and measures of burning.
The principle of current transformer is based on the principle of electromagnetic induction. The current transformer is composed of a closed core and a winding. The number of turns of its primary winding is very small, and it is connected in the line of current to be measured, so it often has all the current of the line flowing through. The number of turns of its secondary winding is relatively large, and it is connected in series in the measuring appearance and maintenance circuit. When the current transformer is in operation, its secondary circuit is always closed, so the impedance of the series coil of the measuring appearance and maintenance circuit is very small, the operation state of the current transformer is close to short circuit.
The current transformer converts a large current on the primary side into a small current on the secondary side for use, and the secondary side cannot be opened.
There are many reasons for the burning of current transformers, the common ones are the following. The secondary open circuit of the current transformer generates high voltage, causing the current transformer to burn out; The insulation is aged for a long time, and local breakdown or discharge occurs, resulting in overvoltage, causing the current transformer to heat up and burn out. The contact surface of the primary connection aluminum row of the current transformer is too oxidized, the contact resistance is too large, and the heat causes the current transformer to burn out. The user's overload operation time is long, causing the current transformer to heat and burn out.
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