Total harmonic distortion in current (THDi) is a growing concern in cooling applications for data centers. It arises when non-linear loads in an electrical power system draw non-sinusoidal currents, distorting the current waveform and introducing inefficiencies.

In data centers, common sources of non-linear loads include rectifiers, inverters, drives, computers, and even lighting systems like fluorescent and LED lights. As the number of drives increases, so does the Total Harmonic Distortion (THD), resulting in higher RMS currents. This requires electrical components such as fuses and cables to be oversized, driving up capital expenditures. Furthermore, elevated THDi levels stress the overall electrical system, reducing efficiency and shortening the lifespan of critical components.

To address these challenges and comply with the IEEE 519 standard, data centers must ensure that the THDi for individual pumps or pump systems remains below 5%. Grundfos intelligent pumps equipped with IE5 motors or CUE drives meet this requirement when paired with active harmonic filters, which are available as accessories. These filters mitigate harmonic distortion, ensuring the electrical system operates efficiently and reliably.

By incorporating advanced harmonic mitigation strategies, we can help you and your customers optimise cooling systems, protect electrical infrastructure, and reduce overall costs while maintaining compliance with industry standards.