"World's recognized authority in power treatment"

ULTRA-K Series 600K-he (5kVA - 500kVA)


High Efficiency K-Rated Power Conditioning Transformers

Green_LeafMeets and Exceeds DOE 2016 Minimum Efficiency Standards!

Subjecting commercial and industrial electrical systems to a harsh, "polluted" electrical environment increases downtime, maintenance costs, and lost productivity. Maintaining spike-free voltage and keeping electrical noise away from sensitive digital circuitry controls, increases the reliability of electronic equipment, contributes to the overall integrity of data, and enhances workflow and productivity.

The ULTRA-K Series 600K-he is a high-efficiency, K-rated, power conditioning transformer, specifically designed to provide a high degree of electrical noise attenuation and transient voltage suppression to sensitive electronic loads. Offered with (4) different K-factor ratings (K4, K7, K13, and K20), the ULTRA-K is fully-compatible with non-linear loads … handling the high harmonic currents associated with such loads.

The ULTRA-K meets and exceeds the high efficiency levels defined by the U.S. Department of Energy (DOE) 2016 Standard, thus providing energy savings under both linear and non-linear loads.

As an owner or specifying engineer … when you select the ULTRA-K Series 600K-he over competing brands, you’re simply choosing the very best high-efficiency, K-rated, power conditioning transformer available!

Need convincing? Read our Features & Benefits, and our FAQ’s below! For more details, download our General and/or Guide Specifications, as well as our product Brochure. Feel free to contact one of our Application Specialists to help you select the correct kVA size and K-rated product for your given application!

Single Phase Sizes: 5kVA, 8kVA, 10kVA, 15kVA, 20kVA, 25kVA

Three Phase Sizes: 15kVA, 30kVA, 45kVA, 75kVA, 112.5kVA, 150kVA, 225kVA, 300kVA, 500kVA

Features & Benefits
Technical Specs

General Specifications

Guide Specifications

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Features & Benefits

  • Transformer power losses are lower than mandated by the DOE 2016 Standard, yielding a direct decrease in operating costs over the life of the transformer
  • Double or triple shielded for high common mode noise attenuation from input to output; and also prohibits system back feed from noise generating load
  • Optional output category B3 SPD (40kA per mode) with high frequency filter provides critical loads with optimum protection from noise, impulses, and high-energy voltage transients
  • Optional output SPD ( 50 kA to 200 kA per phase), UL 1449 Listed, Type 2, including EMI/RFI filtering, Form C relay contacts, and LED status indicators
  • Multiple K-factor ratings (K4, K7, K13, K20) allow proper application for both linear and non-linear loads … the higher the K-factor rating, the more harmonic current the transformer can handle
  • Designed specifically to handle the harmonics, heating effects, and increased output neutral current created by non-linear loads
  • Removes load-generated triplen harmonics from the incoming power source
  • All-copper wound transformer construction allows the optimization of conductor size and geometry, to enhance harmonic-handling capability and transformer efficiency
  • Standard, floor mounted enclosure: NEMA 2 up to 225 kVA; NEMA 1 at 300kVA and 500kVA; optional NEMA 3R outdoor enclosure available up to 225kVA
  • Optional input and/or output circuit breaker(s) provided in a separate NEMA 1 enclosure for external mounting and installation
  • Optional high / over temperature alarm contacts provided for tripping upstream breakers if required
  • Optional industrial-grade IR scanning window(s) for safe, routine thermal scanning of transformer connections under load, without exposing personnel to arc flash hazards
  • Optional lug kit available … mechanical (screw-type) lugs shipped for installer convenience
  • Special voltage configurations available, including "high leg delta" designs

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Technical Specs

  • Efficiency: U.S. — Meets and exceeds U.S. Department of Energy (DOE) 2016 minimum efficiency standards identified under DOE 10 CFR Part 431 Canada — Meets and exceeds CSA Standard C802.2-12
  • Multiple Voltage Compensation Taps: Full capacity above / below nominal; both single and three phase models
  • Output Impedance: 2% - 3.5% typical
  • Output Distortion: Less than 1.0% THD added under linear load
  • Load Regulation: 2% typical, no load to full load
  • Overload: Up to 500% for 10 seconds, 1000% for 1 cycle
  • Isolated Neutral: Establishes a new neutral to ground bond on the transformer’s output
  • Common Mode Noise Attenuation: 126 dB (standard double shielding); 146 dB (optional triple shielding)
  • Transverse Mode Noise Attenuation: 3 dB down at 10kHz, decaying 20 dB per decade; decaying 40 dB with "SPD With High Frequency Filter" option
  • Operating Temperature: -25°C to +40°C
  • Audible Noise: 45 to 55 dBA @ 1 meter (kVA size dependent)
  • Neutral Size: Twice the ampacity of the secondary phase conductor on the three phase models
  • Temperature Rise: 135°C rise above ambient, under non-linear loading per UL 1561 standard
  • UL 1561 Listed, labeled for operation at or below a specific K-factor rating
  • C-UL Listed to CSA Standard C22.2, No 47-13

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  • Audio / Video Recording Equipment
  • IT Systems / Computers
  • VFD Controls
  • Automated Scanning Electronics
  • Isolation For Uninterruptible Power Systems
  • Laboratory Instrumentation
  • Electronic Measurement
  • Key Facilities / Industries Include: Schools, Recording Studios, Performing Arts / Theaters, Waste Water Treatment, Pharmaceutical, Automated Manufacturing

  • Does the ULTRA-K exceed the DOE 2016 minimum efficiency standard?

  • 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. EXAMPLE: Energy savings are easily seen when comparing the power losses of the ULTRA-K to a transformer only meeting the DOE minimum efficiency. For example, 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.

  • What is electrical noise, and what problem does it cause?

  • 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.

  • How is electrical noise generated?

  • 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.

  • How does the ULTRA-K attenuate electrical noise?

  • 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. Providing 2 shields greatly reduces this capacitance. Adding a 3rd 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 which determines the attenuation level, which is frequency-dependent.

  • Will a Surge Protection Device (SPD) alone attenuate electrical noise?

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

  • Why add a Surge Protection Device (SPD) to the output of the ULTRA-K?

  • 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!

  • What is a K-factor?

  • 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.

  • What is a K-rated transformer?

  • 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.

  • How does a K-rated transformer deal with the heat generated by harmonics?

  • 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.

  • Where would I use a K-rated transformer?

  • 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.

  • How much K-rating do I need?

  • 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.

  • Why are copper wound transformers better than aluminum?

  • 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.