News

What is a DC Current Transformer?

Posted by mb

We design DC current transformers as mutual inductance devices specifically for DC current conversion. They leverage the nonlinearity and asymmetry of the core coil when both DC and AC currents magnetize the core. Additionally, through a rectifier circuit, these transformers convert large DC currents flowing through the primary coil into proportional small DC currents, where the current ratio maintains an inverse relationship with the number of coil turns.

Primarily, DC current transformers measure large DC currents. They also serve as key components for current feedback, control, and protection in rectifier systems. In contrast to shunts, they offer distinct advantages: lower power loss and effective electrical isolation.

### Working Principle of a DC Current Transformer

As dedicated devices for DC current conversion, DC current transformers operate based on the nonlinear and asymmetric characteristics of their core coils under combined DC and AC magnetization. Specifically, they step down large primary DC currents to smaller secondary DC currents via a rectifier circuit, with the current ratio following an inverse relationship with the number of primary and secondary turns.

Beyond large DC current measurement, their main applications include providing current feedback, control, and protection in rectifier systems. In contrast to shunts (refer to ammeters), they feature lower power consumption and reliable electrical isolation.

Under ideal operating conditions, the secondary winding (wound around the unsaturated core) bears the voltage difference between the supply voltage U and the voltage across the load resistor Rx. The relationship N₁I₁ = N₂I₂ (or I₁/I₂ = N₂/N₁, where I₂ denotes the secondary current) holds true, meaning the ratio of primary to secondary current is inversely proportional to the turn ratio. After rectification, we can directly measure the secondary current I₂ using a DC ammeter, or calculate it by measuring the voltage drop across the load resistor Rx.

What is a DC Current Transformer?

Recent Posts

Indoor vs Outdoor Current Transformer Differences

Split Core vs Solid Core Current Transformer

Combined Instrument Transformer Working Principle

If you are interested in our products, feel free to contact us anytime!

What is a DC Current Transformer?

Recent Posts

Indoor vs Outdoor Current Transformer Differences

Split Core vs Solid Core Current Transformer

Combined Instrument Transformer Working Principle

If you are interested in our products, feel free to contact us anytime!

We value your privacy

Customise Consent Preferences