Our engineers are specifically trained on all aspects of electrical switchgear, from the routine maintenance and repair of the mechanical aspect of the equipment to the periodic testing of the protection systems and associated relays.
• Complete analysis of medium voltage circuit breakers
• SF6 gas leek detection using highly sensitive leak detection equipment
• Contact resistance measurement
• Insulation resistance measurement
• High voltage DC impulse testing
• Vacuum chamber inspections
• Correct mechanism operation
Vacuum circuit breaker
With rated current up to 3000 A, these breakers interrupt the current by creating and extinguishing the arc in a vacuum container. These are generally applied for voltages up to about 35,000 V, which corresponds roughly to the medium-voltage range of power systems. Vacuum circuit breakers tend to have longer life expectancies between overhaul than do air circuit breakers
Air circuit breaker
Rated current up to 10,000 A. Trip characteristics are often fully adjustable including configurable trip thresholds and delays. Usually electronically controlled, though some models are microprocessor controlled via an integral electronic trip unit. Often used for main power distribution in large industrial plant, where the breakers are arranged in draw-out enclosures for ease of maintenance.
SF6 circuit breakers
A sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur hexafluoride gas to quench the arc. They are most often used for transmission-level voltages and may be incorporated into compact gas-insulated switchgear. In cold climates, supplemental heating or de-rating of the circuit breakers may be required due to liquefaction of the SF6 gas.