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Ultra Isolation Transformer & K-Rated Isolation Transformer
Product Description
An Isolation transformer is the best way to establish a new neutral-ground bond, in order to correct common mode and other grounding problems. A transformer can provide conversion of a Delta system (3 wire) to a Wye connected (4 wire) system. The addition of an electrostatic shield adds further protection from some high frequency impulses and noise that might otherwise pass through the transformer via the inter-winding capacitance. A shielded isolation transformer provides excellent protection from all types of N-G disturbances (impulses, RMS voltage, and high frequency noise). It is critical that the transformer be grounded properly or common mode protection will be ineffective. MODERN designs and manufactures the highest quality isolation transformers.
  • »  Integrated in power conditioner at input or output
  • »  Any system requires isolation and shielding
Typical application in power conditioner
(A) Isolation transformer(Delta/Wye) connected at input terminal
  • »  If there is serious 3 rd harmonic and distortion in main supply, these disturbances can be reduced.
  • »  By Delta/Wye connection, producing new neutral line in output. Then prevent normal operation from poor condition of mains neutral.
  • »  The current wave distortion as 3 rd harmonic by non-linear load is isolated and without contaminating main supply.
(B) Isolation transformer Wye/Delta connection at output terminal:
  • »  Current wave distortion by non-linear load is isolated and reduced. The contamination to main supply and stabilizer can be reduced and improved.
  • »  The current wave distortion effects the correction of output voltage sampling. But the signal at the primary of isolation transformer reflects the regular wave and the power conditioner may operate exactly.
  • »  If there is unbalance load, the power conditioner can run regularly.

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 Krated. 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.