ground fault current sensor in current monitoring of fast EV charging piles and slow EV charging piles

Based on HEYI HYCA-10-PD

With the rapid adoption of new energy vehicles, the construction of charging infrastructure has entered a period of rapid development.

EV Charging piles, as core equipment for power transmission and metering, necessitate crucial functions, including current sensors and residual current monitoring units.

These sensors not only impact the accuracy of energy billing but also directly impact personal and equipment safety.

This article, based on the HEYI HYCA-10-PD ground fault current sensor , will delve into the differences between current sensors used in fast and slow EV charging piles.

Basic characteristics of fast charging piles and slow charging piles

Slow charging pile (AC slow charging)

Power range: 3.5–22kW

Current range: 16–32A (single-phase/three-phase AC)

Main function: Nighttime charging for home users , focusing on household power consumption metering accuracy and AC leakage protection .

Fast EV charging pile (DC fast charging)

Power range: 60–350kW

Current range: typically 200–500A , sometimes higher

Main functions: Rapid energy replenishment, requiring vehicle charging to be completed within tens of minutes, focusing on heavy current monitoring , DC residual current detection and system safety.

residual current sensor in slow charging pile

In AC slow charging scenarios, the core tasks of current sensors are accurate measurement and basic protection:

Electricity billing accuracy

Slow charging stations are commonly used for low- power charging in homes or public places , where accuracy in electricity billing is crucial. The HYCA-10-PD provides 32–40A RMS current monitoring capability, ensuring high accuracy and low temperature drift within this range , making it suitable for long-term stable operation monitoring.

AC residual current detection

Slow EV charging piles are primarily exposed to the risk of AC leakage. The HYCA-10-PD has a built-in AC/DC sensitive detection module that can quickly detect a typical AC current of 30mA, meeting IEC 62752 requirements and ensuring personal safety.

Advantages of small size and low cost

HYCA-10-PD is installed on a PCB board, with a small size and low power consumption (≤110mW), making it very suitable for the application requirements of integrated and low-cost slow charging piles.

Application of ground fault current sensor in fast charging pile

requirements of fast charging piles are to monitor high current and ensure adequate safety:

High current DC fast charging monitoring

Fast charging piles typically output currents of hundreds of amperes, and the HYCA-10-PD’s 40A range is insufficient for monitoring the primary current.

Fast charging piles typically use Hall sensors, shunts + isolation amplifiers, or fluxgate current sensors to accurately monitor DC and high currents.

DC residual current detection (RDC-PD)

Under high DC current conditions , if a DC residual current of 6mA or greater occurs, traditional AC leakage protectors will fail.

Therefore, the HYCA-10-PD provides DC component detection capabilities for this scenario and complies with the IEC 62955 standard, providing safe and redundant protection for fast EV charging piles .

Fast response and strong reliability

Fast charging piles have higher requirements for safety protection time. When the HYCA-10-PD detects a residual current of 30mA~100A, it can act within 8.5–60ms, significantly improving system safety.

Differences between standards and regulations

AC slow charging pile:

mainly complies with IEC 62752, emphasizing the protection of AC leakage current ≤ 30mA.

DC fast charging piles:

must comply with IEC 62955 and require a sensitive response to DC residual current ≥6mA to avoid AC-RCD failure.

HYCA-10- PD is perfectly adaptable to both standards , especially under DC fast charging conditions , and can serve as a safety device for RDC-PD (DC residual current detection device) .

Summary of Application Differences

project	Slow charging pile	Fast charging pile
power	3.5–22kW	60–350kW
Current range	16–32A	200–500A
Sensor core tasks	Accurate metering and electricity bill settlement	High current monitoring, system safety
Key points of leakage detection	AC residual current (IEC 62752)	AC+DC residual current (IEC 62955)
HYCA-10-PD Effects	Main current monitoring + AC leakage protection	Assist RDC-PD to detect DC residual current

Summarize

In the field of new energy vehicle charging piles, the application of residual current sensors varies significantly with the charging power.

AC slow charging pile:

HYCA-10-PD can be used as the core component for main current monitoring and leakage protection, taking into account both accuracy and cost.

DC fast charging pile:

HYCA-10-PD is mainly responsible for the safety protection of DC residual current detection (RDC-PD). It needs to be used in conjunction with high-current Hall/fluxgate sensors to build a complete safety system.

Therefore, HYCA-10-PD is not only suitable for core current monitoring of slow charging piles, but can also be used as a key safety module in fast EV charging piles to provide comprehensive, accurate monitoring and safety assurance for new energy vehicle charging systems.

Compay：HEYI Electrical Co., Ltd.

Brand: HEYI/ASCT

Contact: Bethy

E-mail: heyi@heyiele.com             

Tel: 86-13968747975

 

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