PDU (HMT) Power Transformer

The increasing use of switch mode power supplies and non-linear loads means that power transformers have to cope more frequently with the effects of harmonic load currents. Power Transformers if not designed to handle the additional heat caused by harmonic currents are liable to overheat leading to premature failure.

Typical characteristics of our PDU transformers are to have low voltage distortion, low inrush currents, no phase shift between input and output, and multi-Faraday earth screening together is various ratings of K Factor ratings.

Our ranges of power distribution unit transformers are specifically designed to overcome the heating effects of harmonic load currents. The use of delta to interconnected star (zig-zag) connection not only has the benefit of no phase shift between input and output, which allows simple by-pass systems to be employed when matched voltages are used, but also the cancellation of the balanced portion of triplen harmonics; thus avoiding the problems that can be experienced when using delta to star connected transformers. The Multi-Faraday screening arrangement we use attenuates high frequency electrical noise through the transformer and provide similar characteristics between input and output and vice versa.

For more information on power distribution unit transformers look at our K-Factor Harmonic Mitigating Transformers page.

Typically manufactured for indoor environments and for inclusion within client's bespoke control panels, these power distribution unit transformers are three phase isolation power transformers. The windings are produced using Nomex insulated copper conductor for Class H thermal rating. Cores are manufactured using high quality low loss grain oriented silicon steel.

Termination is either via DIN rail mounted power terminals or copper busbars for higher ratings. Thermal monitoring devices and Faraday screens are terminated in DIN rail mounted terminals situated between the primary and secondary connections or on top of the transformer.

When specified with underbase channels these are positioned for ease of movement using pallet truck or similar.

The standard finish is a final spray coat of black electrical varnish which enhances the appearance whilst giving slightly improved heat radiation.