Power Transformers

Part Number	Description / PDF	Quantity
266J25 Hammond Manufacturing	PWR XFMR LAMINATED 25.2VA CHAS	2
187E10 Hammond Manufacturing	XFRMR LAMINATED 50VA CHAS MOUNT	7
229D24 Hammond Manufacturing	PWR XFMR SEMI-TORO 48VA TH	2
182S30 Hammond Manufacturing	PWR XFMR TORO 625VA CHAS MT	0
269GX Hammond Manufacturing	PWR XFMR LAMINATED 48VA CHAS MT	5
266L14 Hammond Manufacturing	PWR XFMR LAMINATED 28VA CHAS MT	10
185G10 Hammond Manufacturing	PWR XFMR LAMINATED 175VA CHAS MT	4
270EX Hammond Manufacturing	PWR XFMR LAMINATED 118VA CHAS MT	1
739A Hammond Manufacturing	PWR XFMR LAMINATED 1400VA CHAS	1
165U11 Hammond Manufacturing	PWR XFMR LAMINATED 165VA CHAS MT	3
166L28 Hammond Manufacturing	PWR XFMR LAMINATED 56VA CHAS MT	3
166J25C Hammond Manufacturing	PWR XFMR LAMINATED 25VA CHAS MT	26
166G12 Hammond Manufacturing	PWR XFMR LAMINATED 6.3VA CHAS MT	10
261G6 Hammond Manufacturing	PWR XFMR LAMINATED 45VA CHAS MT	6
229A120 Hammond Manufacturing	PWR XFMR SEMI-TORO 6VA TH	31
186B10 Hammond Manufacturing	PWR XFMR LAMINATED 6VA CHAS MT	32
182T117 Hammond Manufacturing	PWR XFMR TORO 1500VA CHAS MT	0
162D56 Hammond Manufacturing	PWR XFMR LAMINATED 1.1VA TH	50
BE2F Hammond Manufacturing	PWR XFMR LAMINATED 40VA CHAS MT	25
229E230 Hammond Manufacturing	XFRMR SEMI-TORO 2VA THRU HOLE	124

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.