Basics for protection against transient and surge voltages

This PDF document from HPM Legrand will provide you with the latest information for Surge protection devices and technical tips you need to know for effective installations. The aim of this presentation is to educate electrical contractors about surge and transient voltages and how to protect properties with surge protection devices.

Key Points to be covered in the webinar:

What is transient and surge voltages?
Why surge voltages are dangerous?
What standards are involved?
Basic principles of surge protection
Legrand offer of surge protection devices

Published: 4 July 2016 Category: White Papers

Topics

Power

HPM Legrand

Basics for protection against transient and surge voltages

Published: 4 July 2016 · Category: White Papers

Key Points to be covered in the webinar:

What is transient and surge voltages?
Why surge voltages are dangerous?
What standards are involved?
Basic principles of surge protection
Legrand offer of surge protection devices

From this document

29/06/2016 SURGE PROTECTIVE DEVICES SUITABLE SOLUTIONS FOR ALL TYPES OF INSTALLATIONS AND ALL RISK LEVELS 1 29/06/2016 CONTENT: • Introduction •Theory and principles •Installation rules •Legrand offer Legrand Australia- Energy Distribution and Industrial applications 2 2 29/06/2016 INTRODUCTION • • • • • Lightning facts Average annual thunder-day and lightning flash density Electrical overvoltage, characteristics Origin of transient overvoltage Damage caused by lightning Legrand Australia- Energy Distribution and Industrial applications 3 3 29/06/2016 INTRODUCTION Overvoltage caused by lightning are responsible for 25% to 40% of all damage to equipment. If the transient over voltages caused by other phenomena (e.g Power network switching) are added to this, close to 60% of all electrical damage could be avoided by installing surge protective devices (SPDs). Legrand Australia- Energy Distribution and Industrial applications 4 4 29/06/2016 LIGHTNING FACTS Average strike: 2000 – 200,000 Amps Time length of strike: 10 – 100 uS Voltage: 6KV up to 2MV, depends on earth resistance e.g. strike of 100KA, earth at 10Ώ = 1MV Energy: can be up to 100MW/m Lightning is caused by electrical charges in the atmosphere that are unbalanced with regards to the earth Around one quarter of lightning is from cloud to ground The average temperature of lightning is around 20000 °C Legrand Australia- Energy Distribution and Industrial applications 5 5 29/06/2016 AVERAGE ANNUAL THUNDER-DAY AND...

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