Elastimold® 35kV GAD (grounding aid device): Utilities industry case study
Thomas & Betts
Thomas & BettsThe Customer
One of the largest clean- energy companies in the United States, the customer provides electricity to commercial and residential consumers, as well as manages clean utility project development and construction.
The company required a permanent, reliable and direct 600A continuous grounding device that could accommodate up to momentary 25,000 amps-rated ground connection for a 35kV system.
There were no products available in the 35kV system for grounding devices that could accommodate 600 amps continuous or a momentary fault current up to 25,000 amps-rated ground connection. The only products available were for grounding devices that accommodate 200 amps continuous and a momentary fault current up to 10,000 amps-rated ground connection. These grounding products also were available for temporary installation only; there were no products available for permanent installation.
The Elastimold® 35kV Grounding Aid Device (GAD) provides a permanent, reliable and direct 600A or 900A, 25kA-rated ground connection with a removable insulated cap that features a capacitive test point for safer operation. The GAD can be used as a permanent installation on the system, and eliminates the need to install temporary grounding adapters and a reducing tap plug for a 200A grounding device.
The 35kV GAD connects into the back interface of 600-amp or 900-amp series elbow connectors (T-body) to provide means to ground the circuit. The GAD is installed using a torque wrench with a torque value of 50-60 foot-pounds. Once the circuit is completely de-energized, it is grounded through a grounding cable to the grounding system. The GAD can remain installed permanently onto the back interface of the 600-amp or 900-amp series elbow connector, but it must be installed with the protective insulated cap when not being used to ground the circuit.
Photo courtesy of Thomas & Betts