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Requirements for Residual Current Devices Intended for Electric Vehicle Charging Systems

Czapp Stanislaw

Automatyka, Elektryka, Zakłócenia

2023

Vol. 14, nr 4(54)

10--20

The properties of residual current devices have been presented from the point of view of their ability to detect a specific shape of the residual current waveform. Moreover, the standard requirements relating to residual current protection used in electric vehicle charging installations have been pointed out. The operating characteristics of the IC-CPD and RDC-DD protections, which are intended for charging electric vehicles in mode 2 and mode 3, respectively, have been also discussed.

Przedstawiono właściwości zabezpieczeń różnicowoprądowych z punktu widzenia ich zdolności do wykrywania określonego kształtu przebiegu prądu różnicowego. Podano wymagania norm odnoszące się do zabezpieczeń różnicowoprądowych stosowanych w instalacjach ładowania pojazdów elektrycznych. Omówiono charakterystyki działania zabezpieczeń IC-CPD oraz RDC-DD, które są przeznaczone do instalacji zapewniających ładowanie pojazdu elektrycznego odpowiednio w trybie 2 oraz 3.

Electrical safety in low-voltage DC microgrids with B-type residual current devices

Czapp Stanislaw, Tariq Hanan, Szultka Seweryn, Szultka Agata, Zaitseva Elena, Levashenko Vitaly

Eksploatacja i Niezawodność

2022

Vol. 24, no. 2

346--358

Residual current devices (RCDs) are most popular devices used in low-voltage installations for protection against electric shock and fire. In cases of high risk of electric shock the application of RCDs is mandatory. Currently, the spread of local direct current (DC) microgrids is widely considered. This creates new challenges for protective systems, in particular those based on RCDs. The main purpose of the research is to test the operation of B-type RCDs by simulating the conditions that may occur in DC microgrids as well as assessment of the effectiveness of electrical safety with the use of such RCDs. The research has revealed that theoretically identical RCDs in terms of technical data can have different tripping properties, including no reaction to residual direct current, which poses a risk of electric shock. This signalizes the necessity of extension of the normative tests performed by manufacturers. The scope of these additional RCDs tests is indicated, from the point of view of the persons’ safety in DC microgrids.