Three Phase Isolation Transformer

We are a reputed firm engaged in offering precision-engineered Three Phase Isolation Transformer. It is a continuous duty rated, 600 volt class, convection cooled, dry type, isolation transformer to support harmonic rich non-linear loads while maintaining safe operating temperatures. This transformer includes superior transverse and common mode noise attenuation. Designed as per NEMA TP 1-2002 dry type transformer efficiency standards, our transformer is acknowledged for high performance and reliability. We provide Three Phase Isolation Transformer in variegated specifications to meet diverse applications.

Standards :

• The power conditioning system is designed in accordance with applicable portions of the following standards

• NEMA TP 1-2002 Dry Type Distribution Transformer Efficiency Standards
• American National Standards Institute (ANSI C57.110 & C62.41-1991)
• Institute of Electrical and Electronic Engineers (IEEE 519-1992)
• National Fire Protection Association (NFPA) 70, National Electrical Code (NEC)
• Federal Information Processing Standards Publication 94 (FIPS Pub 94)
• UL Listed to Standard 1561
• C-UL listed to CSA Standard C22.2, No. 47-M90

 
Input Specifications :

• Nominal AC input voltage ratings: 600 VAC, 480 VAC, 240 VAC or 208 VAC, 3 phase for transformers below 225kVA,and 600 VAC or 480 VAC, 3 phase for transformers 225kVA and above. All are designed with sufficient margin tosustain a constant input of +10% without saturation.
• The nominal operating frequency: 60 hertz + 3 hertz.
• The power conditioning system’s primary is configured in a three phase delta. Transformers below 500kVA include full capacity taps at 2½ % increments, two (2) above and four (4) below the nominal voltage tap. 500kVA transformers include full capacity taps at 2½ % increments, one (1) above and two (2) below the nominal voltage tap.
• Energizing inrush current will not exceed 10 times the full load input current for ½ cycle.

 
Output Specifications :

• Output Voltage : Sinusoidal with no flat topping when high crest factor (3.0 : 1), non-linear loads are present at the output.

• Audible Noise Measured at 1 Meter from the Unit :
  
  • ≤ 50dBA for 15 KVA to 112 KVA
  • ≤ 55dBA for 150 KVA to 225 KVA
  • ≤ 60dBA for 300 KVA to 500 KVA

• Electrostatic Shielding : Incorporates two, or an optional three, solid copper foil electrostatic shields which minimize inner winding capacitance, transients, and noise coupling between primary and secondary windings.
• Common Mode Noise Attenuation : 126 dB with two shields, or 146dB with optional three shields.
• Transverse Mode Noise Attenuation : 3 dB down at 10kHz, decaying 20 dB per decade.
• Efficiency : 98% typical and meets NEMA TP 1-2002 dry type transformer efficiency standards on models 15kVA and
• above.
• The power conditioning transformer is designed to achieve NEMA TP 1-2002 Table 4-2 efficiencies listed below under a
• K-4, K-7, or K-13 non-linear load at or between 35% to 50% load and at an operating temperature of 75 degrees C.

• KVA Efficiency :
  
  • 15*
  • 30
  • 97.00%
  • 97.50%
  • 50 97.70%
  • 75 98.00%
  • 112 98.20%
  • 150 98.30%
  • 225 98.50%
  • 300 98.60%
  • 500 98.70%

*15kVA model efficiency applicable to K4 and K7 loading only.
 

• Optional TVSS : Incorporates a fused (with front panel mounted, blown fuse lamp indicator) 3 phase, secondary connected, 6 mode spike suppression network. The TVSS is comprised of high energy metal oxide varistors with less than a 5 nanosecond response time and a maximum peak current handling capability of 40,000 amps (8x20μsec) per mode.
• The suppression network system will remain functional when subjected to ANSI/IEEE C62.41 Category B-3 waveforms.
• The spike suppression network increases the transverse mode noise attenuation to 3 dB down at 10kHz, decaying 40 dB per decade.

 
Main Transformer :

• Transformer Windings : All copper conductor construction, with separate primary and secondary, isolated windings.
• The transformer conforms to NEC article 250, that specifies a separately derived power source.
• The neutral conductor is sized for 200% of the ampacity of the phase conductor.
• Terminals are provided for isolated three phase output conductors, neutral conductor and ground.
• All leads, wires and terminals are labeled to correspond with the circuit wiring diagram.
• Basic Impulse level : No less than 10,000 Volts.
• MTBF : ≥ 200,000 hours.
• Transformer Steel : Grain oriented, M6 grade, silicon steel.
• Flux Density : ≤ 15k gauss.
• Core Losses :  ≤ 0.6% of the KVA rating.
• Insulation : Class N, 200^OC with a maximum temperature rise of 115^OC above ambient, not exceeding 130^OC under nonlinear loading per UL 1561.
• Cooling : Natural convection.

 
Cabinet :

• Enclosure : NEMA type 2 general purpose, floor mounted, and indoor enclosure.
• Construction : Cabinets are manufactured from 14 gauge steel with base sub-structure suitable for fork lifting.