English
Detection of AC / DC residual currents is required wherever AC circuits are connected to DC circuits and thus the possibility of leakage currents occurs. Therefore, according to the IEC62752 standard, AC charging stations for electric vehicles also require the detection of DC currents, which requires the use of a significantly more expensive type B circuit breaker, compared to the standard type A circuit breaker. type A, which significantly reduces installation costs.
One measuring submodule S-EV-0001X-RC can be connected to the C-EV-0505M module. It is a submodule equipped with a residual (fault) current sensor type RCMB121-1. The sensor is sensitive to both AC and DC fault current according to the IEC62752 standard and can therefore be used to detect fault currents in IC-CPD (In-Cable Control- and Protection Device) applications, such as in electric vehicle charging station applications.
The sensor installed in the submodule detects both AC and DC currents that pass through the phase conductors and the neutral conductor. If fault currents are detected above the given limits, both relay outputs of the module will be disconnected (blocked) and a fault condition will be signaled simultaneously in the module status variables. The fault condition is simultaneously signaled by the red indicator LEDs on the front panel of the C-EC-0505M module. The module remains in this state until the user intervention, which is realized by resetting the detector in the control variable of the module. If residual sensor operation is not enabled in the C-EV-0505M module configuration, the relay outputs of the module are not functionally affected (blocked).
The sensor responds to exceeding the residual current limits of 6 mA DC and 30 mA RMS, for load (charging) currents up to 3x40A RMS (three-phase distribution).
For the correct function of the sensor, it is absolutely necessary to perform its self-test, which also includes its calibration. The test must be performed each time the sensor power supply is switched on (connection of the C-EV-0505M module to the powered CIB line). During the test (it takes approx. 3 s) it is necessary to ensure that no load (charging) current flows through the sensor. The test is started by the user, in the control variable of the module. The progress and result of the test is signaled in the module status variable. The test can also be run repeatedly, eg each time the electric vehicle is connected to the charging station, or before starting a new electric vehicle charging cycle..