Name: Three Phase Electrical Power Isolation Transformer
Brand: Prima Transformers

Industrial Grade Isolation

3 Phase Electrical Power Isolation Transformer (0.5kVA – 5000kVA)

In high-demand industrial electrical distributions, unexpected transients, voltage surges, and common-mode harmonic noise can degrade sensitive electronics, disrupt automation networks, or cause catastrophic insulation failure. Prima Transformers engineers and manufactures high-efficiency Three Phase Electrical Power Isolation Transformers that establish complete electrical and physical separation between the input power grid and downstream branch circuits.

Built upon a rigid, precision-stacked three-legged core structure using premium cold-rolled grain-oriented (CRGO) lamination steel, our transformers feature dedicated primary and secondary windings on each limb. By floating output windings safely from supply ground references (bonding configured per installation requirements), these units eliminate ground loops, suppress electrical spikes, and deliver pure, uninterrupted power to downstream machinery.

Engineered for Stringent Export Standards

Fully certified to IEC 61558-2-4, IEC 60076, and IS 2026/11171 standards with genuine CE compliance, vacuum pressure impregnation (VPI), and stringent computerised routine tests before dispatch.

3 Phase Power Isolation Transformer manufactured by Prima Transformers

General Purpose Isolation Transformers

General Purpose Isolation transformers step down primary distribution lines (up to 750V) to localized service voltages inside commercial complexes, heavy data centres, and industrial processing floors. These dual-winding inductive isolators eliminate hazardous ground-fault feedback while significantly minimizing required runs of bulky, low-voltage power cables, thereby mitigating line losses and infrastructure costs.

Recommended Application Loads:

Industrial facility general lighting and low-noise auxiliary panels
Standard induction motors and compressors (direct online or soft-started)
Precision resistive furnace and process heating configurations
Laboratory automation instruments and cleanroom equipment

Drive Isolation Transformers (DIT)

Modern Variable Frequency Drives (VFDs) and Silicon Controlled Rectifier (SCR) controls inject massive non-linear harmonic distortion, thermal stress, and mechanical switching forces into electrical infrastructure. Prima's custom-engineered Drive Isolation Transformers (DIT) are explicitly tailored to mitigate these challenges without core saturation.

High Harmonic Tolerance: Robust core dimensioning handles elevated flux density without overheating.
Mechanical Coil Bracing: Reinforced winding structures resist severe mechanical forces caused by cyclical high inrush currents.
Stray Loss Minimization: Optimized conductor transposition keeps eddy current losses exceptionally low.
Enhanced Thermal Dissipation: Generous axial cooling ducts ensure prolonged thermal life under elevated THD.

Robust Engineering

Advanced Mechanical & Electrical Construction

Every isolation transformer manufactured at our 5,500 m² Santej facility incorporates high-reliability components engineered for 24/7 continuous industrial endurance.

Acoustic Isolation Pads: Core and coil assemblies mounted on anti-vibration damping pads to minimize operational hum and noise.
Bolted Heavy-Duty Terminations: Precision-machined, copper/tin-plated busbars and terminals suited for copper or aluminium lugging.
Robust Protective Enclosures: Standard IP00 open frames up to IP23/IP42 ventilated sheet steel (powder coated) with lifting lugs and bi-directional wheels.
Stainless Steel Enclosure Options: Custom 304 or 316 grade stainless steel housings available for corrosive, marine, or chemical processing plants.
Seismic Qualified Bracing: Certified structural framing engineered to withstand earthquake seismic shock spectrum requirements.
High-Conductivity Conductors: Electrolytic-grade continuous Copper (Cu) or premium Aluminium (Al) wire/strip windings.
Dedicated Grounding Infrastructure: Continuous copper, aluminium, or galvanized iron grounding bus bar integrated into the core chassis.
Vacuum Pressure Impregnation (VPI): Deep polyester/epoxy solvent-free resin impregnation curing protects coils against moisture and atmospheric contaminants.
Primary Voltage Matching Taps: Standard ±2.5%, ±5% de-energized off-circuit taps provided to match unstable incoming network voltages.
100% Comprehensive Routine Inspection: Automated testing for winding resistance, turns ratio, polarity, load/no-load loss, DVDF, and insulation integrity.

Technical Parameters

Technical Specifications

Engineered to deliver high operating efficiency and comprehensive galvanic isolation across versatile power ratings.

Power Rating

0.5kVA – 5000kVA

Primary Voltage

Up to 750V (Customized)

Secondary Voltage

Up to 750V (Customized)

Frequency

50 Hz / 60 Hz

Vector Groups

Dyn11 / Dyn5 (Others on request)

Ingress Protection

IP00 to IP23 / IP42

Insulation Class

Class F (155°C) / Class H (180°C)

Operating Ambient

Up to 50°C Max.

Efficiency Range

90% to 99%

Design Compliance

IEC 61558-2-4 / IEC 60076 / IS 2026

Standard Range Sizes

Dimensional Data & Mechanical Footprint

Reference dimensions for standard industrial ratings. Tailored enclosure footprints and terminal configurations are available upon request.

Rating (kVA)	Length (mm)	Width (mm)	Height (mm)	Mounting X (mm)	Mounting Y (mm)	Slot Size (mm)	Weight (kg)	Frame Type
0.5	180	125	200	160	90	8 x 20	11	Type A
0.75	240	121	240	160	75	8 x 20	13	Type A
1.0	240	120	240	160	75	8 x 20	14	Type A
1.25	240	135	240	160	90	8 x 20	19	Type A
1.5	240	145	240	160	100	8 x 20	21	Type A
2.0	300	150	300	180	90	10 x 25	26	Type A
2.5	300	160	300	180	100	10 x 25	30	Type A
3.0	300	170	300	180	110	10 x 25	34	Type A
4.0	300	180	300	180	120	10 x 25	41	Type A
5.0	360	200	360	200	135	13 x 28	53	Type A
6.0	360	210	360	200	145	13 x 28	61	Type A
7.5	360	210	360	200	145	13 x 28	65	Type A
10.0	360	215	360	200	150	13 x 28	72	Type A
12.5	360	215	360	200	150	13 x 28	83	Type A
16.0	420	250	420	220	170	13 x 28	110	Type A
20.0	420	260	420	220	180	13 x 28	127	Type A
25.0	480	285	460	220	200	13 x 28	161	Type A
30.0	520	315	520	220	200	13 x 28	201	Type A
35.0	520	315	520	220	205	13 x 28	222	Type A
40.0	550	320	550	220	210	13 x 28	232	Type A
45.0	550	350	550	220	210	13 x 28	261	Type A
50.0	550	400	550	220	265	13 x 28	260	Type A
60.0	600	400	600	400	270	17 x 35	285	Type B
75.0	600	500	600	400	265	17 x 35	329	Type B
100.0	600	500	600	400	270	17 x 35	400	Type B
125.0	750	450	700	400	240	17 x 35	500	Type B
150.0	750	450	700	400	240	17 x 35	550	Type B
200.0	1050	500	950	300 - 300	400	17 x 35	750	Type C
250.0	1200	500	950	350 - 350	400	17 x 35	825	Type C
300.0	1200	500	950	350 - 350	400	17 x 35	900	Type C
400.0	1250	600	1050	400 - 400	400	17 x 35	1200	Type C
500.0	1400	600	1050	400 - 400	500	17 x 35	1450	Type C
750.0	1500	700	1200	450 - 450	500	17 x 35	1650	Type C
1000.0	1620	990	1500	450 - 450	500	17 x 35	2100	Type C
1250.0	1800	990	1500	450 - 450	500	17 x 35	2800	Type C

Engineering Note: Units larger than 1000kVA to 5000kVA are engineered on a project-specific basis. Physical dimensions and total weights represent standard manufacturing baselines and may be adjusted based on enclosure IP rating, temperature rise class, and terminal cubicle requirements.

Mounting Diagram - Type A

Type A Isolation Transformer Construction Drawing

Mounting Diagram - Type B

Type B Isolation Transformer Construction Drawing

Mounting Diagram - Type C

Type C Isolation Transformer Construction Drawing

Isolation Transformer