Located on Melbourne’s renowned Collins Street, Rialto is at the heart of the city’s emerging mid-town. It is the location for many of Melbourne’s big names in finance, law, media, investment, consulting and technology.
System Size800 kVAr
Key EquipmentThyristor Switched Power Factor Correction System
Project Warranty3 years
Quality Energy’s long history at the Rialto dates back almost 20 years. Given the electrical load profile of the Rialto because of the large lifts in the building, this project required engineering intervention not seen on most commercial sites.
The ProblemA low power factor was causing large current surges on the lift switchboards and tripping the circuit breakers. CitiPower also stated that the power factor of each supply had to meet a minimum requirement of 0.8.
The ConsequencesThe lift switchboard was tripping and shutting down areas of the building. There was also the risk that CitiPower would shut down the supply due to their poor power factor issue with power authority regulations.
The SolutionQuality Energy installed a thyristor-switched capacitor bank on the lift switchboard to cope with the rapidly changing load of the lift circuits. If a standard contactor switched capacitor bank is used on such a rapidly varying load, the capacitor bank response would be too slow to maintain the correct power factor and combat the large surging of the load. A Thyristor switched unit will react in milliseconds, maintain the power factor at the predetermined level and keep the load fluctuations as low as possible.
Ensuring the Rialto complied with electrical code was the primary outcome and with the building now compliant, business could continue as normal. A power Factor of over 0.98 ensure no further action was required.