Insulation Resistance And Performance Of The Insulating Material Used
Jun 08, 2018

The Transformer is a device that changes the AC voltage using the principle of electromagnetic induction. The main components are a primary coil, a secondary coil, and a core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulator (magnetic saturation transformer) and so on. According to the use, it can be divided into: power transformers and special transformers (electrical furnaces, rectifiers, power frequency test transformers, voltage regulators, mining transformers, audio transformers, intermediate frequency transformers, high frequency transformers, impact transformers, instrument transformers, electronic transformers , reactors, transformers, etc.). Circuit symbols are commonly used as the beginning of a number. Examples: T01, T201, etc.

Transformer core loss is related to the frequency, so it should be designed and used according to the frequency of use. This frequency is called the operating frequency.

Refers to the transformer primary voltage and secondary voltage ratio, there is no load voltage ratio and load voltage ratio difference.

When the transformer secondary is open, the primary still has a certain current. This part of the current is called the no-load current. The no-load current consists of a magnetizing current (flux producing) and an iron loss current (caused by the core loss). For a 50Hz power transformer, the no-load current is substantially equal to the magnetizing current.

Refers to the power loss measured at the primary when the transformer secondary is open. The main loss is the core loss, followed by the loss (copper loss) of the no-load current on the copper resistance of the primary coil. This part of the loss is very small.

Indicates the insulation performance between the transformer coils and between the coils and the iron core. The level of insulation resistance is related to the performance of the insulating material used, the temperature and the degree of humidity.

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