LV/MV Current Transformers (CT)

How does a CT work?

• The ampere-turns principle is the fundamental operating theory of a current transformer (CT), which states that under normal conditions, the primary ampere-tuns are balanced by the secondary ampere-turns.

• A CT steps down high primary currents to a lower, measurable secondary current (usually 1A or 5A) by maintaining this magnetic balance, ensuring the net flux in the core remains low.

• Metering

• Protection

• Summation

• Interposing

• Split-core

• Core Balance (Earth Leakage)

• Specialty CTs for unique applications

Current Transformer Types

• Looking for a specific LV or MV CT?

• The equivalent circuit model of a CT incorporates the ideal transformer and loss components.

• Using the CT model, we can specify a CT to meet your specific requirements and have it manufactured to suit your installation requirements.

LV Instrument Current Transformers

• Provide a scaled, isolated current signal for metering, protection, and PQ analysis, allowing safe instrumentation on LV feeders without interrupting the circuit.

• Iron core allows for tight coupling and high accuracy.

MV Instrument Current Transformers

• Provide a scaled, isolated replica of primary current so meters can record load, demand, and energy consumption from MV feeders.

• Let you observe, meter, and protect MV feeders without ever exposing equipment or personnel to MV potential

• If you’re planning new switchgear, upgrading metering, or resolving protection issues, see how we can support you with the right LV or MV CTs.

• Not sure about what CT you require? Give us a call to discuss at +61 0402 414 145

• Not sure about when to use a specific CT?

• Want to learn more about the principles of CTs?

• We also offer a training workshop that gives a deep look into current transformers and applications

Training Workshop