What could be the cause of the burnout of the control transformer?

In today's machinery industry, almost every machine tool requires a control transformer. The role of the control transformer is often used as the local lighting power supply, signal lamp or indicator power supply for machinery and equipment, and can also be used as the control circuit power supply in electrical equipment. However, when using the control transformer, many people may encounter the problem of the control transformer being burnt out. In general, what causes the control transformer to burn out?

(1) The overloaded use of the control transformer transformer causes the temperature rise to be too large, which has exceeded the temperature resistance level of the insulating material, thereby burning the transformer.

(2) The inter-turn insulation of the primary and secondary coils is damaged or aged, there is a short circuit between turns, and local overheating leads to burnout.

(3) The welding part of the lead-out wire is virtual welding, and the contact resistance is large, resulting in a high local current density, and even the wire can be fused.

(4) If the iron core has through-hole bolts, the bolts must be insulated from at least one side to the iron core. Otherwise, if a magnetic short circuit is caused, the bolts will be burned red.

The above 4 points are the main reasons why the control transformer is prone to burn out! After we understand these 4 factors, when we need to use the control transformer, we can avoid the control transformer with a little attention. burnt condition.

Response measures to control transformer burnout:

(1) For the control transformer to be burned out due to overload, it is required to replace a control transformer with a larger capacity. The power rating of the applied control transformer must be greater than that of the driven appliance.

(2) The cause of the circuit failure causes the short circuit of the low-voltage control circuit, which makes the secondary coil current of the control transformer too large, which exceeds the rated current of the transformer and burns the machine tool control transformer. In this regard, the current limit insurance can be added in front of the transformer for protection.

(3) It is usually necessary to check the insulation of the line. When the insulation of the control transformer is found to be damaged or aged, the transformer should be replaced in time to avoid leakage and short circuit.

(4) Check whether there is jamming in the rotating part of the machine to avoid overcurrent.