Leakage current sensor is an indispensable and important component in DC systems, which detects the DC leakage current of equipment. Widely used in industries such as DC transmission, power storage detection, DC screens, power supplies, large medical and health equipment, photovoltaics, wind power generation, communication base stations, etc., timely feedback on equipment leakage is provided, and relevant measures will be taken for back-end leakage protection and other components at * * time. Prevent accidents, ensure safe use and production operations.

Due to the fact that capacitors are considered "simple" devices, some design engineers do not pay enough attention to them and therefore do not understand the unique characteristics of MLCC. In an idealized scenario, when selecting capacitors, it is sufficient to mainly consider two parameters: capacity and withstand voltage. However, for MLCC, considering only these two parameters is far from enough.

The technical principle of leakage current sensor:
The flow sensor is installed around the positive and negative output lines of the DC circuit, and when the device is running, it detects the signals output by each branch sensor in real time. When the insulation condition of the branch is normal, the current flowing through the sensor is equal in magnitude and opposite in direction, and its output signal is zero. When the branch is grounded, there is differential current flowing through the leakage current sensor, and the output of the sensor is not zero. Therefore, by detecting the output signals of each branch sensor, the grounding branch of the DC system can be determined. This principle has high line selection accuracy and is not affected by the distributed capacitance of the line.

Technical performance of leakage current sensor:
1. Using magnetic modulation (also known as Flux Gate) technology, the compensation current generated by the internal square wave oscillator compensates for the primary current to achieve magnetic field balance. At this point, the output value VM accurately reflects the primary current and is mainly used for detecting small DC currents and differential currents.
2. Adopt an integrated design to replace the traditional splitter+transmitter approach. The detection method for other components is small in size and easy to install. To avoid usage issues caused by a small spatial structure.