Founded in 1998, Tianrui Electronics is a power signal acquisition and transmission solution provider integrating scientific research, production, sales and service. The main products include: current transformer, current sensor, Rogowski coil, Digital panel meter etc.

The company's current three major business areas are: relay protection and automation, smart grid, and new energy. Among them, the main target markets in the field of relay protection are: power sensors and GPS synchronization clock sources; the main target markets in the field of smart grid are: digital power meters and high-voltage electric energy metering devices; the main target markets in the field of new energy are: solar and wind power conversion devices, New energy battery monitoring devices, etc.

A split core current transformer (CT) is a type of current sensor designed to measure alternating current without disconnecting the circuit. Unlike solid core CTs, it has a hinged or separable core that can be easily opened and clamped around an existing conductor, making installation quick and non-intrusive. It works by transforming the high current flowing through the conductor into a smaller, proportional current for monitoring and metering. Split core current transformer(CTs) are widely used in energy management, power monitoring, and protection systems. They are ideal for retrofitting existing electrical systems, offering convenience, accuracy, and safety in applications such as smart grids, building energy management, and industrial automation.

A current sensor is an electronic device that detects and measures the flow of electric current in a conductor, either alternating current (AC) or direct current (DC). It converts the current into a proportional signal, such as voltage or digital output, which can be used for monitoring, control, or protection. Current Transducer(Current sensors) are commonly based on technologies like Current transformers, Hall effect sensors, or Rogowski coils. They are widely applied in power systems, industrial equipment, renewable energy, smart grids, and electronic devices, helping improve energy efficiency, ensure safety, and provide accurate data for automation and management.

A Hall effect current sensor is a device that measures electric current using the Hall effect principle. When current flows through a conductor, it generates a magnetic field. The sensor’s Hall element detects this magnetic field and produces a voltage proportional to the current. This output signal can be processed to monitor AC or DC currents accurately. Hall effect current sensors provide isolation between the measured conductor and the sensing circuit, ensuring safety. They are widely used in power electronics, electric vehicles, renewable energy systems, industrial automation, and battery management due to their high accuracy, reliability, and versatility.

The working principle of a current transformer (CT) is based on electromagnetic induction. When alternating current flows through the primary conductor, it generates a magnetic field around it. This magnetic flux passes through the CT’s magnetic core and induces a proportional current in the secondary winding. The secondary current is a scaled-down version of the primary current, allowing safe measurement and monitoring of high currents without directly connecting measuring instruments to the power line. CTs are essential in metering, monitoring, and protection within electrical power systems.

A current sensing circuit is designed to measure the flow of current and convert it into a readable signal for monitoring or control. It can be built in several ways depending on the application. The simplest method uses a shunt resistor, where the voltage drop across the resistor is proportional to the current. For higher isolation and safety, current transformers or Hall effect sensors are used to detect the magnetic field created by the current. The output signal is then amplified or converted into digital form for microcontrollers, meters, or protection systems.

A Current Transformer (CT) and a Core Balance Current Transformer (CBCT) are both used for current measurement and protection, but they serve different purposes. A CT measures the current in a single conductor by stepping it down to a safer, measurable level, often used for metering and protection. A CBCT, also called a zero-sequence CT, surrounds all three phase conductors (and sometimes neutral) together. It detects imbalance or leakage currents, mainly for earth fault protection. In short, CT focuses on measuring line current, while CBCT focuses on detecting ground faults.

Current sensors are devices that detect and measure the flow of electric current in a conductor, converting it into a signal for monitoring or control. They come in several types based on technology and application. Current transformers (CTs) step down high AC currents for metering and protection. Hall effect sensors use magnetic fields to measure both AC and DC. Rogowski coils provide flexible, non-intrusive measurement for high-frequency AC. Each type differs in accuracy, range, isolation, and cost.

A Rogowski coil is a specialized device designed to measure alternating currents (AC), especially where accuracy, safety, and wide dynamic range are required. Unlike traditional current transformers, it is built without a ferromagnetic core, making it lightweight, flexible, and free from magnetic saturation. These unique characteristics make Rogowski coils highly valuable across industries where monitoring and analyzing electrical current is essential.