Live Line Arrestors - Maintenance Replacement made easy

Function

Arrestors are over-voltage protection devices. Download

Surge arrestors are MOV based devices that are designed to protect against the damaging effects of spikes and transients caused by lightning, utility switching, isolation arching, electrical motor cycling, or any other sudden change in the electrical power flow on incoming AC power lines. Lightning damage, is responsible for a large percentage of over-voltage occurrences, these are either direct strikes to a line or induced voltages onto the line. (strikes within 40m of a line).

Live Line Arrestors prevent flashover between phases, prevent damage to poles and protect transformers from lightning damage and surges. Live Line Arrestors can be intelligently placed on lines in problem areas where equipment is consistently damaged.

The placing of LLT Arrestors has proven to be more cost effective than improving the insulation of poor performing lines.

A spent Live Line Arrestor can be exchanged for a new unit with the aid of a link stick and with the system energized.

Operation

• Designed to prevent over-voltage caused by lightning transients or surges.
• On breakdown of the MOV blocks, the system frequency disconnects the faulty surge arrestor via the GLD (Ground lead disconnector). This unit, is placed at the bottom of the surge arrestor and is back in appearance.
• The surge arrestor, falls into the open position and can be replaced live line.

Benefits

1. Changed Live Line.
2. Changed from Ground.
3. Easily identified when blown.
4. Safer
5. Easier maintenance.
6. Easy & Effective replacement.
7. Elimination of outage times.
8. Cost Effective method of protecting an area.
9. Arrestor can effectively be opened when there are Problematic Arrestors or GLDs.
10. Easy isolation during fault finding.
11. Operational Staff relieved of Dangerous situations.
12. Operational Staff response to Arrestor maintenance improved.
13. On the Spot replacement.
14. Building up Staff of attitudes by providing easier maintenance of Arrestor unit.
15. Fear Factor of Operational staff removed when working on high voltage equipment.
16. Line Inspections a pleasure.
17. Spent Arrestor easily noticed for replacement from previous Lightning Incident.
18. Risk of equipment exposure eliminated.
19. Faulty units immediately replaced, no postponing of the maintenance effort.
20. Used at Distribution line ends and T-offs (voltage doubling points)