Standard Rogowski coils are of universal specifications with fixed measuring range, size and bandwidth, featuring fast delivery and high cost performance. However, TFY custom Rogowski coil sensors not only have the above characteristics, but can also be tailor‑designed according to requirements such as kA‑level measuring range, 0.1Hz–1MHz bandwidth, installation space, protection grade, terminal interface and communication mode. Their flexible open structure and electrical parameters are more suitable for special working conditions. With fully automatic precision winding technology, they have better consistency and stability than standard Rogowski coil sensors. In addition, TFY Rogowski coil sensors feature extremely high accuracy with an error as low as ±0.1mA, so they can meet the customized demands of special applications such as high‑end equipment and smart grids.
Rogowski coils have a wide range of application scenarios and fields. Engineers can refer to the key parameters of the following indicators for selection according to their own needs and different operating environments:
Key Parameters for Rogowski Coil Selection
1.Rated current/range: Match the measured current and reserve overload margin.
2.Output type: Integrating type (voltage output) or non-integrating type (current output).
3.Accuracy and linearity: Determine measurement accuracy; Class 0.5 and Class 0.2 are commonly used.
4.Frequency bandwidth: Affects the ability to measure harmonics, transients, and impulse currents.
5.Phase error: Critical for power metering and relay protection.
6.Structure type: Split/closed, flexible/rigid, which determines installation convenience.
7.Insulation and withstand voltage: Meet the system voltage level and safety distance.
8.Operating temperature and protection grade: Adapt to on-site environments.
9.Size and installation method: Whether live installation or disconnection-free wiring is required.
10.Anti-interference capability: Stability in strong industrial electromagnetic environments.
First, the customer needs to communicate the required key electrical parameters with TFY engineers, such as measuring range, accuracy, transformation ratio, power supply mode, load capacity, communication method, output signal requirements, terminal and interface definition, cable length, and operating environment. TFY engineers will carefully listen to your requirements, provide reasonable suggestions and design solutions. After customer approval, TFY engineers will issue a formal specification for the customer to confirm before proceeding with prototype production. The prototype samples will be tested and qualified by TFY's testing laboratory, then submitted to the customer for testing and approval. After finalization and control of various documents, mass production can be carried out.
A Rogowski coil sensor is essentially a hollow toroidal solenoid structure. Operating based on the law of electromagnetic induction and Ampere's circuital law, it is a specialized sensor for measuring alternating current. According to the magnitude of the primary current, the sensor outputs a voltage signal with a fixed transformation ratio on the secondary side. When a Rogowski coil sensor is not equipped with an integrator, it outputs a differentiated voltage signal. After passing through an integrator and amplification, it outputs an integrated voltage signal with a 90° phase shift. Customer engineers and technicians choose whether to configure an integrator according to their different applications and requirements.
