Harmonics are disturbances on the AC electricity network that are primarily caused by modern electronic equipment such as variable speed drives (VSDs), uninterruptible power supplies (UPSs) and many other forms of electrical device.

These disturbances not only reduce the operating life of sensitive electronic devices, but in extreme cases can cause catastrophic failures in the form of fire and/or explosion. Electricity distributors often apply penalties or require remedial measures if harmonic levels are causing issues with the local electrical grid.

Energy NZ’s Power Quality Audits look at the nature, severity and impact of harmonics in both the voltage and current waveforms at your site to determine whether further action is required. If harmonics are an issue, mitigation measures such as blocking chokes can be used to minimise the danger and cost of electronics failures and grid disturbances.