STATION MODERNISATION AND EQUIPMENT


I


granic Control Systems specialises in the refurbishment of old and obsolete low-


voltage and medium-voltage equipment, including VCBs and OCBs, that are no long- er safe and/or reliable. Considerable cost savings can be achieved by replacement of the old equipment leaving the existing site cabling in place.


The owner of a hydroelectric power station asked Igranic Control Systems to help them with the replacement of 16kV line isolators and earth switches, which were becoming unreliable.


The line isolator provides isolation between the SF6 circuit breaker and the generator transformer.


The ABB line isolators to be replaced were rated at 16kV, 4500A, Power Frequency


“Considerable cost savings can be achieved by replace- ment of the old equipment leaving the existing site ca- bling in place.”


Withstand 64kV for 1 minute, with a short time rating of 40kA for 3 seconds.


The scope of work, which had to be com- pleted during a critical shutdown period, comprised a detailed site survey of the ex- isting equipment, design of the interfaces between the existing pneumatic isolation and control system, design of all replace- ment equipment for the line isolator and earth switches, completing a HAZOP in conjunction with the purchaser to verify the replacement design, installation of the new isolator and earth switch and steel- work on each unit, site commissioning and training of site staff.


The new design, using a motorised isola- tor, allowed for visual confirmation on the isolator and earth switch that each indi- vidual phase had operated correctly from outside the SF6 circuit breaker cell.


FOR MORE INFORMATION


T: 01234 267242 E: info@igranic.com W: www.igranic.com


78 | rail technology magazine Apr/May 11


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