EV 6mA Type B RCD Leakage Current Protection Sensor
With a worldwide total of only 7.3 million EV charging points, of which 6.5 million were private in 2019, the lack of an extensive charging infrastructure is a key impediment to the growth of the global electric vehicle market. To support the massive deployment of EVs, driven by ambitious policies to phase out sales of internal combustion engine (ICE) vehicles, the charging infrastructure must increase by thirteen times.
Due to this high expected demand, manufacturers of electric chargers must develop solutions that are competitive, affordable and capable of being industrialized at high volume. As well as being easy to install for the end user, they must meet many standard criteria, both for safety and robustness of the product.
Since 2016, IEC standards and more specifically IEC 62955 / IEC 62752, require the detection of a Direct Leakage current at 6 mA DC to avoid the home Residual Current Device (RCD) Type A being ineffective. This effect, called “the blinding effect”, appears when an EV develops an insulation fault.
EV architecture integrates a battery pack, powered by Direct Current (DC), which can generate a leakage current that can deactivate a home RCD. To protect the RCD and avoid the need to install an RCD type B in the electrical panel of home EV owners, EV chargers include a device to detect the DC leakage current. This detection is the md0630t01a rcd sensor of the IVY.
MD0630T01A is a high sensitive residual current detection RCD which has the characteristics of accurate measurement, small size and integration. The leakage current sensor can be set separately for AC and DC leakage. An alarm signal is generated when the set current is reached. The leakage sensor has a digital output function, which can directly read the current value of DC and AC. This residual current sensor will detect DC and AC residual currents in 50Hz/60Hz AC installations according to IEC62955. It's primarily intended for use in Electric Vehicle charging stations to disconnect the supply to the Electric Vehicle under a DC residual fault current condition. As a single phase type B RCD It will protect against DC (6mA) and AC (30mA) residual currents, and will signal to the Smart EVSE if a fault occurs.
MD0630T01A Type B RCD provide protection against residual fault currents / earth leakage in AC supply applications with specific waveform characteristics. Type B RCDs are used where smooth and/or pulsating DC residual currents can occur, non-sinusoidal waveforms are present or frequencies greater that 50Hz; for example, Electric Vehicle Charging, certain 3-phase devices, micro generation or SSEGs (Small Scale Electricity Generators), solar panels, wind generators, industrial automation, smart home, IOT field etc.
