 Model Number |
Ultra-K |
| Brand Name |
Controlled Power |
ULTRA-K ISOLATION TRANSFORMER
K-Rated Shielded, Isolation Transformer
TECHNICAL SPECIFICATIONS
Scope
This specification describes the features and design of the K-rated shielded isolation transformer. All systems are designed and manufactured to assure maximum reliability, serviceability and
performance. The overall function of the isolation transformer is to support harmonic rich non-linear loads while maintaining safe temperature restrictions. The Ultra-K also isolates sensitive electronic equipment loads from electrical noise and voltage impulses.
1.0 General
The Ultra-K is a copper wound, K-rated, multi-shielded isolation transformer. The shielded isolation transformer will step the secondary voltage to provide the correct output voltage and offer superior common mode and transverse mode noise attenuation.
2.0 Standards
Ultra-K systems are designed and manufactured in accordance with the following:
American National Standards Institute (ANSI C57.110)
Energy Act of 1992, H.R. 776 DOE defined in NEMA Standard TP-1-1996
Institute of Electrical and Electronic Engineers (IEEE 519-1992 and C62.41-1991)
National Fire Protection Association (NFPA) 70 National Electrical Code (NEC)
Underwriters Laboratories (UL) 1449 and 1561
Energy Act of 1992, Efficiency Standard H.R. 776 DOE defined in NEMA Standard TP-1-1996.
Federal Information Processing Standards Publication 94 (FIPS Pub 94)
2.1 ENVIRONMENT
2.1.1 Humidity: Transformers operate in a relative humidity of 0 to 95% non-condensing.
Altitude: Sea level to 5000 feet without de-rating.
3.0 Ratings
3.01 The Ultra-K is designed for K ratings of K-4, K-7, K-13, and K-20.
K = ？/FONT> Ih(pu)2 h2 h = harmonic, I = RMS current at harmonic.
Transformers will provide at continuous duty, full load output power.
Model number shall include an identity to: input, phase, output, frequency,
KVA, Series, Shielding, Filtering and Surge Protection. i.e. 8DLX-75K6-13-BSF
Standard transformers
Single Phase KVA Sizes: 5, 8, 10, 15, 20, 25
Three Phase KVA Sizes: 15, 30, 50, 75, 100, 112, 125, 150, 225, 300, 500
3.02 Input
The transformer is designed for an input of 208 or 240 for single phase and 208,240, 480 or 600 volts AC 3 phase delta with sufficient margin to sustain a constant input of +10% without saturation. (300-500Kva transformers are 480 or 600 volts input only.)
3.03 Operating Frequency: 60 Hertz + 3 Hertz
3.04 Voltage Compensation Taps
The transformer is configured with input taps provided at 2 1/2 % increments with (2) above and (4) below the nominal input rating. 500Kva is supplied with one 5% tap above and two 5% increment taps below nominal rating.
3.05 Turn-On Characteristics
When energized the current inrush shall not exceed 20 times the full load input current for 1/2 cycle or less.
3.06 Output
The output of three phase transformers are configured as a 5 wire wye 208/120 or 480/277 volts AC 3 phase with neutral and ground (other voltages available). Single Phase transformers
are configured 4 wire, 2 hot, neutral and ground.
3.07 Output impedance 3% to 4 % , depending on size.
3.08 Load Regulation
The output voltage will maintain to within +2.5%, or less, from no load to full load.
3.1 OVERLOAD RATING
500 % for ten seconds. 1,000 % for one cycle.
3.2 HARMONIC DISTORTION
The Ultra-K system shall add no more than 1% total harmonic distortion to the output waveform. Output voltage remains sinusoidal with no flat topping when high crest factor (3.0), non-linear loads are present at the output.
3.3 EFFICIENCY
No less than 98 %.
3.4 AUDIBLE NOISE
Less than 50 dB for 15 KVA to 112 KVA units measured from 1 meter.
Less than 55 dB for 150 KVA to 225 KVA units measured from 1 meter.
Less than 60 dB for 300 KVA to 500 KVA units measured from 1 meter.
3.5 NOISE ATTENUATION
3.5.1 Common mode noise is attenuated to -126 dB for dual shielded transformers. Triple shield to -146dB. (Optional)
3.5.1.1 The transformer incorporates a dual or triple copper electrostatic shield to minimize inner winding capacitance, transient and noise coupling between primary and secondary windings. Inner winding capacitance is limited to .005 pf or (.0005 pf for triple shield) between
primary and secondary windings.
3.5.2 Transverse mode noise attenuation shall decay 20 dB down per decade under full resistive load.
3.5.2.1 Transverse mode noise attenuation shall be 3 dB down at 10K Hertz, decaying 40 dB per decade with a resistive load. (Optional )
3.5.3 Transient Suppression Network: The Ultra-K will incorporate a fused (with blown fuselamp indicator) 3 phase, secondary connected, 6 mode spike suppression network designed
to attenuate high speed, high energy transients. The suppresser is comprised of high energy
metal oxide varistors with less than 5 nanosecond response time and a peak current handling capability of 40,000 amps max (8x20m sec) per mode. Conforms to UL 1449 rating 330 volts
when tested with ANSI/IEEE C62.41 Cat. B3 waveform. (Optional)
3.6 OPERATING TEMPERATURE
-20° C to +40° C.
4.0 Main Transformer
The Ultra-K is designed as a dry type, convection air cooled , 600 volt class shielded isolation transformer.
4.01 The transformer windings are all copper conductor construction, with separate primary and secondary, isolated windings. The transformer conforms to NEC article 250-5D
compliance, that specifies a separately derived power source. The neutral conductor is provided at 2 times the ampacity of the phase conductor.
4.02 Terminals are provided for isolated three phase output conductors, neutral conductor and
ground.
4.03 All leads, wires and terminals are labeled to correspond with circuit wiring diagram.
4.04 Basic Impulse level will be no less than 10,000 Volts.
4.05 Mean Time Between Failure (MTBF) 200,000 hours.
4.1 MAGNETIC
Grain oriented, M6 grade, silicon transformer steel is utilized for minimum losses and maximum efficiency. Flux density will not exceed 15k gauss. Core losses are
limited to 0.6% or less of the KVA rating.
4.2 INSULATION
Class H, 200 ° insulation system
Class N, 200° C system.
4.3 COOLING
4.3.1 The transformer is designed for natural convection cooling. The full load operating temperature rise shall be less than 115 degrees C above ambient.
5.0 Cabinet
5.01 Cabinets are general purpose NEMA type 1 indoor type. NEMA type 2 optional.
5.02 Cabinets are manufactured from 14 gauge steel. Base sub-structure adequate for fork lifting.
5.03 The cabinet shall have a baked on paint finish with proper pre-treatment
5.04 All 3 phase transformer cabinets are constructed with bolt down sub structures and for hard wiring the input and output.
5.05 Single phase transformer cabinets include castors and 7 optional distribution panels for breaker/receptacle, drop cabling, field wiring or hard wiring. (Seismic restraints optional)
5.06 Termination - Termination shall be rear access with input and output connections made of copper stand off bus.
5.07 Ventilation shall originate from the bottom of the cabinet
KVA Single Phase Only Cabinet (inches)
5-25 21.5W - 29D - 30H
KVA 3 Phase Only Cabinet (inches)
15-30 23W - 20D - 28.5H
50-75 35W - 25D - 39.5H
100-150 41.5W 27.5D - 39H
225-300 56W - 41.5D - 48H
500 56W 41.5D 77H
5.08 Btu output - VA x 0.03 x 3.41 = Btu/hr
6.0 Warranty
Controlled Power guarantees all transformers to be free from material defects and workmanship for a period of 2 years following delivery.
7.0 Distribution Options
7.1 MAIN INPUT BREAKER
A main input molded case thermal magnetic circuit breaker, rated at 125 % of the full load input current, will be furnished in a wall mounted enclosure.
7.2 OUTPUT BREAKER
Output molded case thermal magnetic circuit breaker, rated at 125 % of the full load output current, will be furnished in a wall mounted enclosure.
7.3 RPD REMOTE POWER DISTRIBUTION CENTER
The RPD shall incorporate a main disconnect breaker and a 42 pole panel, pre- assembled in a NEMA type 1 enclosure. The cabinet shall offer the option of an additional feed breaker and 42 pole panel. The cabinet shall be on casters for ease of installation. Input and output cabling shall be bottom feed.
Weight: 310 lbs.
Dimensions: 21.5" W - 29.0" D - 44" H
Optional -Second 42 pole panel board with main disconnect
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