Lightning Proof Fuse
Function
The Lightning Proof Fuse (LPF) protects your distribution Line from over current damage, by isolation of the fault. It is a convenient and cost effective method of over current protection, with the advantage of eliminating nuisance fuse blows.
Conventional Fuse Cut-outs are simply removed and replaced with the Lightning proof fuse. The Lightning proof fuse is not to be used as a line fuse and should only be placed within the vicinity of the pole mounted transformer. According to research 90% of fuse callouts are caused by nuisance Fuse blowing. Both Direct and Indirect lightning strikes are the cause of nuisance fuse blowing.
By utilizing the LPF, Lightning will not cause nuisance outages, as with the use of the conventional fuse-cutout.
Another advantage of utilizing the LPF, is that point location will be achieved when a transformer is down. By simply replacing existing line fuses with links and utilizing the Lightning proof fuse at the Pole mounted transformer , multiple customers can be provided with faster fault recovery, improving power quality during Lightning storms.
Available from sales
Tel : +2718 468 5080
Mobile: +2784 701 3354
Email : sales@liveline.co.za
Operation
- By removing the conventional fuse carrier and replacing it with a Lighting proof fuse, nuisance fuse blows are eliminated. When lightning strikes a line either indirectly or directly, it induces extremely high frequencies on a distribution line which would even traditionally blow , a standard fuse rated to 100A.
- The Lightning proof fuse, is not to be used as a line fuse , and is only to be installed at the Transformer.
- The Power frequency flows through the inductance coil and the standard fuse link, the inductance coil can take a continuous current of 15A.
- The Coil allows the system frequency current to operate through it, but blocks high frequency transients (ie Lightning), not allowing these high transients to flow through the fuse. The fuse thus remains healthy during electric storms.
- The High frequency transient is by-passed via an arching horn.
- Should a fault current occur, it will blow the fuse and cause the unit to fall open as any standard fuse holder would open. This isolates the faulty transformer. Replacement of the fuse is as normal.
Inductance Coil
The Power frequency flows through the inductance coil and then the standard fuse. The inductance coil can take a continuous current of 15A.
The coil allows the system frequency current to operate through it but blocks high frequency transients, not allowing these high frequencies to flow through the fuse. The High frequency transient is by-passed via an arching horn.
Should a fault current occur, it will blow the fuse and cause the unit to fall open as any standard fuse holder would open thus isolating the faulty transformer. Replacement of the fuse is as usual.
Arching Horn
Lightning cannot blow the fuse as it jumps over the Arching horn, which is in place to provide an easy exit for the Lightning. Operators are to ensure that healthy Arrestors are in place so as to provide the Transformer with protection.
Standard Eskom Fuse 5A 15A
The Lightning proof fuse carrier houses a standard fuse element from 5A to 15A.
Accessories for a complete Installation
LLT-DPF
The LLT-FC100 Fuse carrier is a standard 100A maximum rated unit
LLTDPF-HB
Cycloaliphadic insulators are lightweight and easy to install.
LLT-PRF
The expulsion fuse link is available in amperages ranging from 1A-100A.
Two speeds of operation are available:
Type K (Fast operating) & type T (Slow operating)
Specifications
| Operating Voltage | – | Distribution lines 3kv = 22kv |
| Fuse Cutout Material | – | Cycloaliphadic Material |
| Fuse Carrier Rating | – | Maximum 15A |
| Fuse (Operating Amperage) | – | Standard Expulsion Links (Type K) Fast expulsion (Type T) Slow operation |
| Product Category | – | Over-current Line protection |
| Specification | – | Eskom specification |
