The Origin and Necessity of DC Smoothing 6mA
As we have mentioned in previous articles, the rise of the new energy automobile industry has brought earth-shaking changes to the automobile industry around the world. Automobiles powered by new energy sources will be the pioneers of the global automobile industry. The growth of the new energy vehicle market is inseparable from the construction of basic charging facilities. How to ensure the safety of electricity during the charging process, especially to prevent leakage current from causing harm to life and property, is a problem worthy of attention.
For leakage current monitoring equipment, such as our ACDC leakage current sensor, not only can monitor the AC leakage current monitoring, but also have high sensitivity and accuracy for the DC leakage monitoring. To be able to detect the cause of DC leakage, the charging of electric vehicles needs a residual current monitor to detect the leakage, so as to avoid the danger that the car battery (DC) is connected to the main power supply (AC). The DC component generated by the charging pile or control box during the charging process will affect the quality of the power grid, and the DC leakage will also have the risk of arcing on the electrical appliance itself.
If there is a smooth DC leakage current of IΔn DC ≥ 6 mA in the charging pile, the response time and sensitivity of the A-type leakage protector (RCD) will be disturbed during the long-term charging process (the high-permeability ring is under the influence of direct current Will produce magnetic offset). Since this kind of leakage cannot be detected, the protection threshold of the TypeA leakage current sensor will no longer be reliable. In order to prevent false detection, you can choose to add a DC 6mA DC residual current monitor to the charging pile. Such as our ACDC leakage current sensor.
In the process of charging with AC charging piles, when the insulation between the internal circuit board of the charging pile and the equipment casing is damaged, a pulsating DC residual current may be generated in the rectifier part. When the DC leakage is greater than 6mA, the magnetic core will be pre-magnetized due to the DC residual current, which will increase the trip value and cause the A-type RCD to fail to operate normally. Therefore, the A-type RCD must add a DC6mA DC residual current monitor or use a B-type RCD Protect it. And our ACDC leakage current sensor, whether it is type A or type B, can meet the monitoring function of RCD.
For the Type A and Type B monitoring involved in the charging pile, including the monitoring of AC leakage and DC leakage, our ACDC leakage current sensors are doing well in many countries’ markets. Knowledge about leakage current and ACDC leakage sensors For more information, you can also check through our website: www.ivy-metering.com
