Power Transformers

Part Number	Description / PDF	Quantity
229D20 Hammond Manufacturing	PWR XFMR SEMI-TORO 48VA TH	7
3FD-548 Tamura	PWR XFMR LAMINATED 12VA TH	20
R8235NLT PulseR (iNRCORE	TRANSFORMER PLANAR 85UH	0
DST-5-36 Signal Transformer	PWR XFMR LAMINATED 12VA TH	391
R8306NLT PulseR (iNRCORE	TRANSFORMER PLANAR 153UH	0
70031K Talema	XFRMR TOROIDAL 7VA THRU HOLE	0
166E12 Hammond Manufacturing	XFRMR LAMINATED 1.8VA CHAS MOUNT	22
162H56 Hammond Manufacturing	PWR XFMR LAMINATED 20VA TH	36
AH30028 Zettler Magnetics	PWR XFMR LAMINATED 2.4VA TH	27
1182J110 Hammond Manufacturing	PWR XFMR TORO 120VA CHAS MT	3
PC-120-85 Signal Transformer	PWR XFMR LAMINATED 10VA TH	0
162E36 Hammond Manufacturing	XFRMR LAMINATED 2.4VA THRU HOLE	26
A41-25-28L Signal Transformer	PWR XFMR LAMINATED 25VA CHAS MT	0
TCT50-05E07AB-B Triad Magnetics	PWR XFMR LAMINATED 50VA CHAS MT	0
F5-28 Triad Magnetics	PWR XFMR LAMINATED 12VA CHAS MT	559
XF-10248 Amgis	PWR XFMR TORO 50VA CHAS MT	0
PHC25KGA Hammond Manufacturing	PWR XFMR LAMINATED 25VA CHAS MT	10
DPC-20-1200 Signal Transformer	PWR XFMR LAMINATED 24VA TH	36
182M30 Hammond Manufacturing	PWR XFMR TORO 160VA CHAS MT	0
186B28 Hammond Manufacturing	PWR XFMR LAMINATED 5.6VA CHAS MT	40

Power Transformers

1. Overview

Power transformers are static electrical devices that transfer energy between circuits through electromagnetic induction. They enable voltage conversion (step-up/step-down) while maintaining galvanic isolation. These components are fundamental in power distribution systems, renewable energy integration, and industrial equipment, ensuring efficient energy transmission and voltage level adaptation.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Distribution Transformers	Medium voltage conversion (1kV-36kV), compact design	Urban power grids, residential areas
Transmission Transformers	High voltage (66kV-800kV), grid stability focus	Substations, long-distance power lines
Instrument Transformers	Measurement and protection (CT/VT types)	Energy metering, relay protection
Specialty Transformers	Custom configurations (furnace, traction, marine)	Industrial furnaces, railway systems

3. Structure and Components

Typical construction includes:

Core: Grain-oriented silicon steel laminations for magnetic flux path
Windings: Primary/secondary copper/aluminum coils with insulation layers
Insulation: Mineral oil, synthetic esters, or solid materials (e.g., epoxy)
Cooling System: Radiator tanks, fans, or forced-oil circulation
Tap Changer: On-load/off-load voltage regulation mechanism
Protection: Buchholz relay, pressure relief valves, temperature sensors

4. Key Technical Parameters

Parameter	Typical Range	Significance
Rated Voltage	230V-800kV	Determines system compatibility
Power Capacity	50kVA-1000MVA	Defines energy throughput
Voltage Ratio	1:1 to 1:20	Specifies transformation ratio
Efficiency	95%-99.5%	Impacts operational costs
Short Circuit Impedance	4%-20%	Affects fault current limitation
Insulation Class	A (105 C) to C (220 C)	Determines thermal endurance

5. Application Areas

Major sectors include:

Electricity distribution networks (urban/rural)
Renewable energy systems (wind/solar grid-tied inverters)
Industrial machinery (CNC, smelters, compressors)
Railway traction systems (15kV-25kV conversion)
Data centers (HVDC conversion systems)

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Siemens Energy	Blue Transformers	Environmentally friendly synthetic ester insulation
Asea Brown Boveri (ABB)	550kV UHV Transformer	500kV DC transmission capability
General Electric (GE)	Premier Series	Smart monitoring with Predictivity analytics
Mitsubishi Electric	330MVA Traction Transformer	Compact design for Shinkansen trains

7. Selection Guidelines

Key considerations:

Voltage levels (primary/secondary requirements)
Load profile (continuous vs. intermittent duty)
Cooling requirements (ONAN/ONAF/OFAF modes)
Environmental conditions (temperature, altitude, seismic zones)
Protection features (IP rating, fire resistance)
Smart grid compatibility (IoT sensor integration)

Case Study: Wind farm grid connection selected 33/132kV ONAF-cooled transformer with 12% impedance to meet fault ride-through requirements.

8. Industry Trends

Current development directions:

Smart transformers with real-time monitoring (IEEE C57.163 compliant)
Amorphous metal core adoption (50% core loss reduction)
Hydrogen-cooled systems for offshore applications
Modular solid-state transformer (SST) prototypes (DOE GRID DATA initiative)
Increased demand for 132kV+ mobile transformers in disaster recovery

Market forecasts indicate 6.2% CAGR through 2030, driven by grid modernization and EV charging infrastructure expansion.