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The NOJA Power GMK is trusted worldwide as reliable way to protect and control underground electrical equipment. Whether it’s a renewable generation connection, industrial three phase load, or even rolling stock, the NOJA Power GMK has delivered reliability and cost savings.
Key to its success are the varied GMK build options. With these options integrated into the GMK and factory tested in Brisbane Australia, commissioning and on-site engineering becomes much more simple.
“The beauty of our GMK product is its flexibility to provide the complete medium voltage grid interface solution in one, easily customised to meet customers’ exact requirements,” says NOJA Power Group Managing Director Neil O’Sullivan.
In this article, we explore 5 of the most commonly requested build options for a NOJA Power GMK.
Any consideration of asset ownership should consider works practices. When using a GMK, engineers often integrate many components of a single line diagram into the single assembly.
Adding an Earth Switch is a welcome addition on most GMK projects, as it allows operators to use the circuit breaker for current interruption, then the earth switch for equipment earthing, followed by unplugging the DIN Terminals for isolation.
The NOJA Power GMK Earth Switch Option incorporates a pad-lockable, mechanically interlocked earth switch within the GMK assembly. This ensures the earth switch cannot be closed while the breaker is closed, meeting works practices requirements and enhancing operator safety.
With the GMK’s most common application being private infrastructure and renewable generation, metering equipment is high on the list of build options.
Metering CT’s can be specified by the procuring engineer, and NOJA Power build these CT’s into the connection bay. Connections are wired back to a terminal block in the Low Voltage compartment, and the inclusion of an optional Revenue Meter completes the meter installation.
Some GMK sites require a self powered design.
In these cases, NOJA Power can fit an additional step down transformer in the GMK, providing auxiliary supply for the control and instrumentation. This addition makes the GMK more versatile and mobile through removing reliance on an external low voltage supply.
Of course, if onsite DC or LV AC is available, the control instrumentation can be powered from this source too.
