Load Flow & Short Circuit Analysis for Company in New Zealand | Carelabs

Two questions matter most when a New Zealand facility's electrical demand grows: can the existing network actually carry the new load without exceeding equipment ratings, and can the existing protective devices still safely interrupt a fault under the new configuration? Load flow and short-circuit analysis answer each in turn, and both matter for the same underlying reason — equipment sized and protected for a facility's original load doesn't automatically stay adequate as that load changes.

Load flow analysis solves the network's steady-state operating condition for a specified generation and load configuration — node voltages, real and reactive power flow on each branch, and system losses — which is how planning questions get answered concretely: whether a line can be taken out for maintenance without overloading the remainder, and whether transformer taps and reactive power compensation are placed correctly for current demand. Short-circuit analysis answers a different question at each point in the network: how much fault current would actually flow there, and whether the breakers, fuses, and cabling in place can interrupt or withstand it. Growth that increases generation or adds significant load usually increases available fault current too, which is why a facility that only checks load flow can still be carrying an under-protected fault risk it doesn't know about.

Carelabs performs both studies in ETAP and delivers findings aligned with AS/NZS 3000, giving a documented basis for equipment and protection decisions rather than relying on assumptions about a system's original design. Contact our engineering team if your facility's electrical demand has grown since its last review.