President Steyn 3 Shaft
MV Oil Circuit Breaker Service & Repairs
Project Overview
Welkom Winder Services successfully completed the servicing, refurbishment and repair of Medium Voltage Oil Circuit Breakers (OCBs) for President Steyn 3 Shaft during 2010. The project focused on restoring the operational integrity, protection performance and reliability of critical medium-voltage circuit breakers responsible for protecting mine electrical infrastructure from faults and overload conditions. Through comprehensive inspection, oil testing, component refurbishment, electrical testing and mechanical servicing, the breakers were returned to full operational condition, ensuring reliable protection of mining equipment and improved system safety. Medium Voltage Oil Circuit Breakers are essential protection devices within mining electrical distribution systems. Welkom Winder Services carried out a complete maintenance programme that included detailed inspection, oil analysis, refurbishment of electrical components, replacement of worn parts, operational testing and recommissioning. The work ensured that the circuit breakers continued to operate safely under fault conditions while extending equipment lifespan and reducing the risk of catastrophic electrical failures. The refurbishment programme restored reliable fault interruption capability while maintaining compliance with mining electrical standards and OEM requirements.
Engineering Challenge
Medium Voltage Oil Circuit Breakers required comprehensive servicing and refurbishment to restore operational integrity, protection performance and reliability of critical mining electrical infrastructure
Solution Delivered
Completed comprehensive maintenance programme including inspection, oil analysis, component refurbishment, replacement of worn parts, operational testing and recommissioning to OEM standards
Result
Restored reliable fault interruption capability, extended equipment lifespan and reduced risk of catastrophic electrical failures while maintaining compliance with mining electrical standards
Long-Term Client Partnership
Medium Voltage Oil Circuit Breakers play a vital role in protecting mining electrical networks from overloads, short circuits and catastrophic equipment failures. By carrying out professional servicing, refurbishment and testing, Welkom Winder Services ensured that the President Steyn 3 Shaft electrical protection system continued operating safely, reliably and in accordance with OEM and mining safety standards.
Scope of Services
What is a Medium Voltage Oil Circuit Breaker?
A Medium Voltage Oil Circuit Breaker (OCB) is a specialised electrical protection device designed to interrupt high fault currents within medium-voltage electrical distribution systems. The breaker uses specially formulated insulating oil to extinguish electrical arcs created when interrupting fault currents. During normal operation, the oil provides excellent dielectric insulation while also cooling and quenching electrical arcs generated during switching. Over time, the insulating oil deteriorates through carbonisation, contamination and moisture absorption, reducing its dielectric strength and increasing the risk of equipment failure. Routine servicing is therefore essential and typically includes dielectric oil testing, oil filtration or replacement, contact inspection, arc chamber cleaning, mechanical servicing, insulation resistance testing and operational verification. Proper maintenance significantly extends breaker lifespan while ensuring safe, reliable protection of transformers, motors, switchgear and critical mining infrastructure.
Engineering Gallery
System Benefits
Improved Electrical Protection
Restored breakers provide reliable protection against overloads and short circuits.
Reliable Fault Interruption
Serviced breakers ensure dependable fault clearing under all operating conditions.
Extended Equipment Lifespan
Professional refurbishment extends operational life without requiring full replacement.
Increased Personnel Safety
Properly maintained breakers protect personnel working near electrical equipment.
Reduced Risk of Electrical Failure
Proactive maintenance minimises the risk of catastrophic electrical equipment failure.
Improved System Reliability
Restored breakers improve the overall reliability of the mining electrical distribution system.
Enhanced Dielectric Performance
Oil testing and filtration restore insulating oil to optimal dielectric strength.
Reduced Unplanned Downtime
Reliable protection systems minimise unplanned production interruptions.
Cost-Effective Asset Preservation
Refurbishment provides a cost-effective alternative to full equipment replacement.
OEM-Compliant Maintenance
All work completed in accordance with recognised OEM specifications and mining standards.
