Protection relay technology has advanced dramatically over the years offering the end user a complex array of features. Often the relays will however only require a fraction of the settings available to be utilized. Protection relays whether they are electro-mechanical or microprocessor based are precise measuring devices and require periodic testing to prove correct functionality.
GENERAL REPAIRS
Our workshop engineers will carry out all types of repairs, refurbishments,s and modifications to equipment from circuit breakers to complete switchboards. We also specialize in the refurbishment of fire and flood-damaged switchgear, from the removal and return to our works for repair then the re-installation and re-commissioning of the plant and associated equipment.
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 plants, where the breakers are arranged in draw-out enclosures for ease of maintenance.
VACUUM CIRCUIT BREAKER
With a 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 overhauls than do air circuit breakers.
SF6 CIRCUIT BREAKER
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.
