Current Limiting Protection Devices for reliable electricity distribution Overhead lines can be both cost-effective and reliable in terms of electricity distribution. This is achieved by using covered conductor technology and advantageous line and system design. One important way to improve the quality of electricity is to use new protection devices.

The advantages of new current limiting devices compared to traditional arc-protection methods are as follows: • Operation of the protection device does not require high-speed auto re-closure operation (no automatic switching operations at substation) - short (< 1 s) interruptions in distribution are eliminated! • The protection devices are not dependent on the direction of power supply - the devices can be placed on different sides of the crossarm, which increases the distance between the bare parts under tension. This reduces, for instance, the probability of failures caused by tree branches...

SDI3143.2 Protection of small distribution transformers Using current limiting devices for transformer proection is as beneficial as using them to protect covered conductors. The number of highspeed automatic reclosures can be reduced significantly compared to the widely used power arc devices – thus, a resistant and maintenance-free protection method is achieved. Ensto has renewed the product range of its current limiting devices for small transformers (< 200 kVA). A special attention has been given to easy usability: • all necessary parts with one product code • easy to adjust surge arrester...

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