Detailed explanation of Rogowski coil types and application scenarios

The Rogowski Coil is a sensor used for measuring alternating current, based on the principle of electromagnetic induction, and has the characteristics of non-contact, wide frequency response, and high linearity. According to different design and application requirements, Roche coils can be divided into the following categories:

1. Classify by structure

Split core Rogowski coil

Features: The coil is designed as an open-ended circular structure, making it easy to install onto running wires without disconnecting the circuit.

Application: Commonly used for on-site power system monitoring, fault diagnosis, or temporary measurement.

Disadvantages: The opening may introduce slight errors, and the long-term stability is slightly lower than that of the closed type.

Solid core Rogowski coil

Characteristic: The coil is a complete closed loop, and the wire needs to be disconnected and passed through the coil during installation.

Application: Laboratory, high-precision measurement, or fixed installation scenarios.

Advantages: High precision, good stability, but low installation flexibility.

2. Classify by material

Air core Rogowski coil

Features: The coil has no magnetic core inside, relies entirely on air medium, has excellent linearity, and is suitable for high-frequency measurement (MHz level).

Application: High frequency current detection (such as power electronic switches, RF equipment).

Magnetic core Rogowski coil

Features: The coil is wound on a magnetic core (such as ferrite), which can improve low-frequency sensitivity, but high-frequency performance is limited.

Application: Low frequency current measurement (such as power frequency power systems).

Hybrid Rogowski coil

Features: Combining hollow core and magnetic core design, balancing high-frequency and low-frequency performance.

Application: Broadband scenarios (such as testing new energy inverters).

3. Classify by application scenario

Rogowski coils for power systems

Features: High voltage resistance, high current (kA level), strong resistance to electromagnetic interference.

Applications: power grid current monitoring, relay protection, fault recording, etc.

Roche coil for electronic devices

Features: Small size, high sensitivity, suitable for high-frequency signals (such as MHz level).

Application: Switching power supply, frequency converter, semiconductor device testing, etc.

4. Classify by signal processing method

Passive Rogowski coil

Features: Directly output induced voltage signal, requiring external integration circuit or dedicated integrator processing.

Advantages: Simple structure and low cost.

Active Rogowski coil (integrated)

Features: Built in integrator and amplifier, directly outputting standard current or voltage signals.

Advantages: Easy to use, stronger anti-interference ability, suitable for long-distance transmission.

5. Special types

PCB Rogowski coil

Features: Made through printed circuit board (PCB) technology, high precision, small size, suitable for integrated equipment.

Application: Embedded current detection in electronic devices (such as server power management).

Flexible Rogowski coil

Features: The coil is made of flexible materials (such as silicone wrap) and can be bent to adapt to complex spaces.

Application: Narrow spaces or temporary measurements (such as electric vehicle battery monitoring).