PROJECT SNAPSHOT:
MIRUS Solution Resolves Solar Connection Stand-off with Utility
Failure to connect to the grid
In 2013, Sean Hammond, VP of Operations at Barrie, Ontario-based EthoSolar found himself in a bit of a tight spot when a 500 kW solar installation in Southern Ontario was not allowed by the utility to connect to the grid. The non-MIRUS supplied transformer was deemed insufficient because of the utility’s interpretation of Hydro One Network Inc.’s Transformer Interconnection Requirements (HONI TIR). Without the ability to connect to the grid, the project remained incomplete, putting a strain on EthoSolar’s construction financing.
Fortunately for Sean, MIRUS International began working in this sector. After some initial discussion, it became apparent that the only solution to save the existing transformer was to install a zigzag autotransformer and neutral grounding inductor (NGI) designed to meet the HONI TIR requirements. The team at MIRUS came to the rescue with a very quick turn-around, shipping these devices to site two weeks later.
What were the benefits of MIRUS’ solution?
The zigzag autotransformer (an adaptation of MIRUS’ NCE™) and NGI were added to the existing transformer to address the utility’s requirement for effective grounding during islanded operation, without introducing a low impedance path for circulating common-mode currents. Another option was to replace the existing transformer with one from MIRUS’ new line of ULLTRA™ Solar Transformers that have the HONI TIR requirements built-in.
READ THE COMPLETE SNAPSHOT.
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