splitcore

Splitcore refers to a type of magnetic core used in current measurement devices, most commonly split-core current transformers (CTs). The core is divided along a plane into two halves, allowing the device to be opened and clamped around a conductor without disconnecting the circuit. When closed, the halves form a complete magnetic path around the conductor, which acts as the primary winding.

In a split-core CT, the conductor whose current is to be measured passes through a window in the core. The secondary winding surrounds the core; the voltage or current derived from the secondary is proportional to the primary current, scaled by the turns ratio. The device is typically used with a burden resistor to convert secondary current into a measurable voltage for meters, relays, or data loggers. Split-core CTs are available in various ratios and are designed for different current ranges and accuracy requirements.

Advantages of split-core CTs include easy installation in existing systems without disconnecting components, non-intrusive retrofits for energy monitoring and load analysis, and the ability to measure current in tight spaces or around multiple conductors with adapters. They are widely used in electrical panels, building management systems, renewable energy installations, and industrial metering.

Limitations and considerations include potential reductions in accuracy due to the mechanical split, tolerance, and core material, especially at higher frequencies or very low currents. The secondary must always be loaded (short of open-circuit) to prevent high voltages and core saturation. Proper sizing, installation alignment, and adherence to safety standards are important.

See also: current transformer, energy metering, electrical instrumentation.