Difference between Hall Current Sensor and Instrument Transformer

Hall current sensor, DC and AC current can be measured, ordinary Current Transformer can only measure AC current, common current transformer, when used, the secondary side can not open circuit, Hall current sensor can be open circuit. The output current of the Hall current sensor is proportional to the current flowing through the primary side, and the polarity of the primary side current change also changes, so that AC and DC power can be measured, and there is no special requirement for the waveform; the applicable frequency range is also wide. Generally used in electronic circuits, such as inverters. AC transformer can only measure AC, and the frequency must be rated frequency, such as 50Hz transformer measurement 60Hz error is relatively large, the output signal can not be directly into the electronic detection circuit.

The traditional current and voltage transformers are special transformers that measure the current and voltage using the principle of electromagnetic induction, and provide physical or analog quantities. Hall voltage and current sensors use the Hall effect principle to measure electrical parameters such as voltage, current, power, frequency, impedance, or waveform. The combination of optoelectronic technology and digital technology can achieve digital control of electrical parameters, which is the future direction of development.

Hall sensors have other advantages:

High accuracy: The accuracy in the operating temperature range is better than 1%, which is suitable for any waveform measurement. The common transformer is generally 3% to 5% accurate and suitable for 50Hz sinusoidal waveforms.

Good linearity: better than 0.1%

Good dynamic performance: The response time is less than 1μs. The tracking speed di/dt is higher than 50A/μs. This excellent dynamic performance of the Hall Sensor module provides a key basis for improving the performance of modern control systems. Compared with ordinary transformer's response time is 10-12ms, it can not meet the needs of the development of the work control system.
Work frequency bandwidth: 1% accuracy in the frequency range 0-100kHz. Accuracy is 0.5% in the 0-5kHz frequency range.

Large measuring range: Hall sensor module is a system product, current measurement up to 50KA, voltage measurement up to 6400V.

Strong overload capacity: When the primary current is overloaded, the module will reach saturation and can be automatically protected. Even if the overload current is 20 times of the rated value, the module will not be damaged.

In addition, Hall sensors also have the advantages of small size, light weight, high sensitivity, and strong resistance to electromagnetic interference. This makes Hall sensors more and more used in the industrial field, and the market space is gradually increasing.

Energy Meter For Base Stations

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