ULTRA-K Series 600K-he (15 kVA - 500 kVA) Three Phase

Yes! Efficiency for a given kVA size will vary from transformer to transformer, but the ULTRA-K’s design allows its efficiency to still exceed the minimum DOE-mandated level.rnrnExample: Energy savings are easily seen when comparing the power losses of the ULTRA-K to a transformer only meeting the DOE minimum efficiency. More specifically, our 150 kVA ULTRA-K tested 99% efficient at 35% load; that’s only 530 W of losses, compared to the minimum required efficiency of 98.83% which represents 621 W of losses. The ULTRA-K power losses were 17% lower, which reflect a decrease in operating costs over the life of the transformer.

Electrical noise is a high frequency, low energy signal that travels on the power and ground lines of an electrical distribution system. This electrical noise can harm digital circuitry because the high frequencies can easily be coupled into the signal path and cause data corruption. This corruption often results in system upset, unexpected restarts, and nuisance equipment behavior.

While conditions external to a facility can cause electrical noise and impulses, the majority of these disturbances are generated by electronic and electrical equipment within the facility. Examples of this equipment include photocopiers, lighting controls, variable speed drives, and motor loads.

Noise attenuation is a function of the transformer itself and its ability to attenuate common mode noise (noise between the line and ground conductors) and transverse mode noise (noise between the line conductors). To address common mode noise, the ULTRA-K is manufactured using full-length electrostatic shields to minimize the capacitance between the primary and secondary of the transformer.rnrnProviding two shields greatly reduces this capacitance. Adding a third shield reduces the capacitance even more. By reducing this capacitive value, the electrical noise attenuation increases! The design and application of these shields are critical to the noise attenuation achieved. As for transverse mode noise, it is primarily the inductance of the transformer that determines the attenuation level, which is frequency-dependent.

No, not necessarily. A typical SPD is designed to protect against high-energy voltage transients, not electrical noise.

An SPD is designed to protect against high energy voltage transients by clamping them at a safe voltage level. It will ensure that dangerous high energy (and high voltage) transients never reach critical downstream equipment. The SPD is a perfect complement to the ULTRA-K transformer. Together, your critical equipment will be protected from both disruptive electrical noise and damaging high energy transients!

It is a value used to determine how much harmonic current a transformer can handle without exceeding its maximum temperature rise level. K-factor values range from 1 to 50. K-factor of 1 is used for linear loads only, and a K-factor of 50 is used for the harshest harmonic environment possible. A K-factor of 7 to 13 is typical. When transformers use a K-factor value, they are said to be K-rated.

A K-rated transformer is one which is used to accommodate harmonic generating loads. Harmonics generate additional heat in the transformer and cause non-K-rated transformers to overheat, possibly causing a fire. K-rated transformers are sized appropriately to handle this additional heat, and are tested to UL 1561 rigorous standards.

To handle increased internal temperatures, either the geometry of the coil conductor is changed or multiple conductors are used to minimize the heating effect caused by load-generated harmonics. In addition, a double-sized neutral conductor is used to accommodate the increased neutral current resulting from non-linear loads. Quality transformers are also manufactured with a high grade silicon steel, copper windings, and more air ducts.

Anywhere non-linear loads are present. New construction, renovations, factory automation, computer rooms, and office buildings are prime locations for K-rated transformers because of the type of equipment being used which generates harmonics.

Typically a K-13 rated transformer is sufficient for most applications. Loads approaching 100% non-linear or more than 75% THD should incorporate a K-20 rated transformer.

Copper has a higher current carrying capacity than aluminum, which is an important factor when designing K-rated transformers for harmonic-rich loads. Copper allows you to minimize the conductor used and optimize its geometry by using flat, rectangular wire to increase the surface area of the conductor. This reduces stray losses within the transformer, thus the heating effect from harmonics. Less power losses lead to higher efficiency.