Current Transformer Saturation: Causes, Effects & How to Avoid It
Current transformer saturation is one of the most common causes of metering errors, protection misoperation, and distorted current waveforms in power systems. When a current transformer (CT) saturates, its secondary output no longer accurately reflects the primary current — and in a protection or metering circuit, that can mean a false trip, a missed fault, […]
How to Choose a Current Transformer for Energy Metering: PCB-Mount, Miniature & Precision CT Guide
Current transformers (CTs) are the sensing heart of every energy meter, watt-hour meter, and smart metering system. A well-chosen PCB current transformer or miniature current transformer determines metering accuracy, dynamic range, and long-term stability. This guide walks through the key specifications you must evaluate — accuracy class, burden, turns ratio, frequency, and mounting — and […]
Current Transformer Accuracy Class: Metering vs Protection CT Guide
What Is a Current Transformer Accuracy Class? A current transformer (CT) steps down high line currents to a measurable, safe level for meters, relays and instruments. Its accuracy class defines the maximum error the CT is allowed to introduce under specified conditions. Choosing the right accuracy class is essential: a metering application needs a small […]
Mini PCB Current Transformer: How It Works & Selection Guide
Mini PCB current transformers are tiny magnetic components that measure AC current directly on the printed circuit board – no isolation amplifier, no shunt resistor heat, no galvanic isolation worries. They are the standard solution for metering, monitoring, and protection circuits in compact electronic products. This guide explains how mini PCB current transformers work, their […]
Hall Effect Current Sensor: Working Principle & Key Specs
Hall effect current sensors measure both AC and DC current without breaking the circuit, using the magnetic field generated by the current itself. They are the standard solution for motor drives, EV chargers, battery management, and industrial monitoring where galvanic isolation and wide bandwidth matter. This guide explains how Hall effect current sensors work, the […]
Current Transformer: Working Principle, Types & Selection Guide
Current transformers (CTs) measure alternating current safely by scaling high currents down to levels instruments and relays can handle. They are essential in power metering, protective relaying, energy monitoring, and industrial automation – and choosing the right one depends on accuracy class, burden, frequency, and installation type. This guide explains how current transformers work, the […]
Zero Sequence Current Transformer: Working Principle, Specs & Selection Guide
What Is a Zero Sequence Current Transformer? A zero sequence current transformer (ZSCT) — also called a residual current transformer, zero phase current transformer or earth leakage current transformer — detects unbalanced (residual) current in three-phase and single-phase systems. When the three phase conductors (and neutral, where present) are passed together through its core, the […]
Mini PCB Current Transformers: How They Work, Key Specs & Selection Guide
Mini PCB current transformers are compact, low-cost components used to measure alternating current in electronic circuits without breaking the circuit. They are widely used in energy meters, power monitoring, protection circuits and smart devices. This guide explains how PCB current transformers work, their key specifications, and how to select the right one. What Is a […]