Power Transformers

Part Number	Description / PDF	Quantity
275X Hammond Manufacturing	PWR XFMR LAMINATED 167VA CHAS MT	0
166K6B Hammond Manufacturing	PWR XFMR LAMINATED 7.56VA CHAS	20
183F36 Hammond Manufacturing	PWR XFMR LAMINATED 5VA TH	36
187D10 Hammond Manufacturing	PWR XFMR LAMINATED 30VA CHAS MT	32
185F28 Hammond Manufacturing	PWR XFMR LAMINATED 130VA CHAS MT	7
182J117 Hammond Manufacturing	PWR XFMR TORO 120VA CHAS MT	0
186C120 Hammond Manufacturing	PWR XFMR LAMINATED 12VA CHAS MT	16
370BX Hammond Manufacturing	PWR XFMR LAMINATED 55VA CHAS MT	8
369AXP Hammond Manufacturing	PWR XFMR LAMINATED 40VA CHAS MT	2
379X Hammond Manufacturing	PWR XFMR LAMINATED 193VA CHAS MT	1
162G48 Hammond Manufacturing	PWR XFMR LAMINATED 12VA TH	2
372KX Hammond Manufacturing	PWR XFMR LAMINATED 432VA CHAS MT	3
182M110 Hammond Manufacturing	PWR XFMR TORO 300VA CHAS MT	0
164E28 Hammond Manufacturing	XFRMR LAMINATED 2.4VA THRU HOLE	50
266P18 Hammond Manufacturing	PWR XFMR LAMINATED 90VA CHAS MT	6
370DX Hammond Manufacturing	PWR XFMR LAMINATED 86VA CHAS MT	7
291AEX Hammond Manufacturing	PWR XFMR LAMINATED CHAS MT	1
186D12 Hammond Manufacturing	PWR XFMR LAMINATED 31.5VA CHAS	33
373HX Hammond Manufacturing	PWR XFMR LAMINATED 369VA CHAS MT	2
161F34 Hammond Manufacturing	PWR XFMR LAMINATED 4.4VA TH	3

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.