What is EN 61643-22:2011?

EN 61643-22:2011 is a technical standard that specifies requirements and testing methods for devices known as surge protective devices (SPDs) or surge arrestors. These devices are designed to protect electrical and electronic equipment from transient overvoltages caused by lightning strikes or other voltage surges.

Surge Protective Devices

Surge protective devices are essential components in modern electrical installations, especially in areas prone to lightning activity or unstable power grids. They provide a safeguard against electrical damage by diverting excessive voltage away from sensitive equipment. SPDs can be installed at various points in an electrical distribution system, such as at the main incoming power supply, sub-distribution boards, or even individual equipment.

EN 61643-22:2011 Requirements

The standard sets forth detailed requirements for SPDs, ensuring their reliability and performance under various conditions. Some key aspects covered by EN 61643-22:2011 include:

Maximum discharge current: Specifies the highest surge current that the SPD can safely dissipate without failure.

Voltage protection level: Defines the maximum voltage that the SPD must limit itself during a surge event, thereby protecting downstream equipment.

Response time: Sets limits on how quickly the SPD should respond when a surge occurs.

Endurance: Ensures that the SPD can withstand repeated surges without degradation of its performance.

Testing Methods

To verify compliance with EN 61643-22:2011, SPDs undergo rigorous testing. These tests simulate various electrical surge conditions to evaluate the device's performance. Some common tests performed on SPDs include:

Surge current test: Measures the SPD's ability to handle high magnitude surges.

Combination wave test: Evaluates the SPD's response to a standardized waveform simulating lightning strikes.

Pulse current test: Assesses the device's capability to handle repetitive pulses of specified magnitude.

Endurance test: Subjects the SPD to multiple surge events to assess its long-term reliability.

EN 61643-22:2011 provides a comprehensive framework for evaluating and certifying the quality and performance of surge protective devices. Compliance with this standard ensures that these devices effectively mitigate the risks associated with transient overvoltages, safeguarding our electrical and electronic systems.