Ultra-K Transformer (5kVA - 500kVA) |
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Description The Ultra-K is an all copper wound, K-rated, multi-shielded, high efficiency, computer grade, low impedance, isolation transformer. The Ultra-K provides voltage transformation as well as harmonic handling and attenuation plus a new ground-neutral reference for isolating equipment in buildings with high ground noise. The Ultra-K also provides high common mode and transverse mode noise attenuation, and fits perfectly in environments where there is a need for spike and ground noise protection. The Ultra-K meets NEMA TP 1-2002 dry type distribution transformer efficiency standards under a linear load and is designed to achieve Table 4-2 efficiencies under a K13 non-linear load at or between 35% to 50% of its rating on models 30kVA and higher. Single Phase Sizes: 5kVA, 8kVA, 10kVA, 15kVA, 20kVA, 25kVA Three Phase Sizes: 15kVA, 30kVA, 50kVA, 75kVA, 100kVA, 112kVA, 125kVA, 150kVA, 225kVA, 300kVA, 500kVA Features & Benefits Technical Specs Applications FAQ |
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 Features & Benefits
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Technical Specs
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Applications
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FAQ
It is a value used to determine how much harmonic current a transformer can handle without exceeding it’s 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 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 deal with harmonic generating loads. Harmonics generate additional heat in the transformer and cause non-K-rated transformers to overheat possibly causing a fire, also reducing the life of the transformer. K-rated transformers are sized appropriately to handle this additional heat and tested to UL 1561 rigid standards for K-factor rated transformers. K-rated transformers use a double sized neutral conductor and either change the geometry of their conductors or use multiple conductors for the coils. Quality transformers are 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 high harmonic content in these areas. 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. Aluminum has a tendency to creep due to change in temperature. Creeping is the contraction and expansion of the aluminum conductors. When they creep: the terminal connections loosen, creating a hazard; they eventually burn clear; and shorten the life of the transformer. Copper is more efficient than aluminum. Copper wound transformers general save money; in many cases they pay for themselves over time. Yes. There is a 30° phase shift between input and output waveforms. When this shifted waveform is applied against a non-shifted waveform, the 5th and 7th harmonics are greatly reduced. Also, in three phase applications, the triplen harmonics are trapped in the primary of the transformer and are not reflected through the building’s distribution grid. The properly coordinated impedance of the Ultra-K makes it a perfect solution for THD reduction and coordination of fault clearing devices. The Ultra-K is 98% efficient. This high efficiency results in a low operating cost and the transformer is capable of convection cooling eliminating any cost and maintenance needed for fans or any other cooling devices. The Ultra-K meets NEMA TP 1-2002 dry type distribution transformer efficiency standards under a linear load, and is designed to achieve Table 4-2 efficiencies under a K13 non-linear load at or between 35% to 50% of its rating on models 30kVA and higher. In single phase applications, the Ultra-K has three distribution options: Top panel receptacles, flexible extension cord with receptacle termination, and flexible extension cord with field wired termination. The three phase Ultra-K is hardwired in and out. Power distribution is accomplished by means of a Remote Power Distribution center (RPD) which incorporates a 42 pole board, input circuit breaker, and bottom access for flexible conduit. |
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