IEC 62955

Abstract

This International Standard applies to residual direct current detecting devices (RDC-DD) for permanently connected AC electric vehicle charging stations (mode 3 charging of electric vehicles, according to IEC 61851-1 and IEC 60364-7-722), hereafter referred to as RDC-MD (residual direct current monitoring device) or RDC-PD (residual direct current protective device), for rated voltages not exceeding 440 V AC with rated frequencies of 50 Hz, 60 Hz or 50/60 Hz and rated currents not exceeding 125 A. NOTE 1 This document can also be used as guidance for devices for voltages up to and including 690 V AC 50 Hz, 60 Hz or 50/60 Hz, at a rated current not exceeding 250 A. RDC-DDs are intended to remove or initiate removal of the supply to the EV in cases where a smooth residual direct current equal to or above 6 mA is detected. NOTE 2 The value of 6 mA for smooth residual direct current was chosen to prevent impairing the correct operation of an upstream type A or type F RCD. This document covers two different classes of residual direct current detecting device (RDCDD) to be used for mode 3 charging of electric vehicles (see classification in 4.1): RDC-MD (monitoring devices), and RDC-PD (protective devices). This document applies to devices performing simultaneously the functions of detection of the residual direct current, of comparison of the value of this current with the residual operating value, and initiating the opening of the circuit when the residual direct current exceeds 6 mA. RDC-PDs according to this document are suitable for isolation. RDC-DDs are intended to be used for single-phase or multi-phase circuits in TN-, TT- and ITsystems. RDC-DDs are intended to be used within the fixed installation. RDC-DDs are intended to be used in AC circuits only. RDC-DDs according to this document are not intended for bilateral power flow between electric vehicle and fixed installation. For RDC-DDs with integrated AC, pulsating DC and 6 mA DC detection, evaluation and mechanical switching in one unit, Annex O applies. For RDC-MD consisting of a RDC-M-unit with a mechanical interface to a separate protective device (circuit breaker or RCD), Annex M applies. For RDC-MD consisting of a RDC-M-module with separated residual current detection and evaluation with an electrical interface to a switching device (e.g. contactor) or a protective device (circuit breaker or RCD), Annex N applies.