What is BS EN IEC 61643‑352 - Components for low-voltage surge protection about?
BS EN IEC 61643 is a series on components for low-voltage surge protection. Components for low-voltage surge protection is an appliance or device intended to protect electrical devices from voltage spikes in alternating current (AC) circuits. BS EN IEC 61643‑352 covers the application of surge isolation transformers (SITs) that are used in telecommunication transformer applications with signal levels up to 400 V Peak to peak. These transformers have a high rated impulse voltage with or without a screen between the input and output windings. SITs are components for surge protection and are used to mitigate the onward propagation of common-mode voltage surges. This document describes SITs' selection, application principles and related information.
Note: BS EN IEC 61643‑352 does not cover power line communication transformers.
Who is BS EN IEC 61643‑352 - Components for low-voltage surge protection for?
BS EN IEC 61643‑352 on components for low-voltage surge protection is useful for:
- Telecommunication equipment manufacturers
- Telecommunication equipment manufacturers
- Design engineers
- Quality control personnel
Why should you use BS EN IEC 61643‑352 - Components for low-voltage surge protection?
Surge isolation transformers are transformers used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons or to reduce transients and harmonics. BS EN IEC 61643‑352 covers surge isolation transformers whose rated impulse withstand voltage coordinates with the expected surge environment of the installation. This type of surge protective component, SPC, isolates and attenuates transient voltages and is often used in conjunction with current diverting components (e.g., GDT, MOV, etc.) or in SPDs.
Surge isolation transformer couples a service across the transformer insulation by magnetic induction. When common-mode surges occur on the incoming service the insulation is voltage stressed. The insulation has three physical paths, solid insulation – insulation material interposed between the two windings, creepage distance and clearance. Differential-mode surges are typically caused by system asymmetry converting what should be common-mode surges to differential ones. Surge isolation transformer action occurs on differential-mode surges and the surge isolation transformers do little to mitigate them. In some cases, surge isolation transformers’ bandwidth will result in the filtering of the output surge frequency spectrum. Signal surge isolation transformers may suffer core saturation, which truncates the secondary voltage. Some standards specify testing for differential power faults, requiring the signal surge isolation transformers to have a primary winding current rating. Using BS EN IEC 61643‑352 you can understand the application of surge isolation transformers that are used in telecommunication transformer applications with signal levels up to 400 V Peak to the peak.
