Power Transformers

Part Number	Description / PDF	Quantity
70062K Talema	XFRMR TOROIDAL 25VA THRU HOLE	397
0800MD-1-003 Talema	PWR XFMR TORO 800VA CHAS MT	0
62045 Talema	PWR XFMR TORO 10VA CHAS MT	0
62035 Talema	PWR XFMR TORO 7VA CHAS MT	0
70085K Talema	XFRMR TOROIDAL 50VA THRU HOLE	0
70032K Talema	XFRMR TOROIDAL 7VA THRU HOLE	130
0400MD-1-003 Talema	PWR XFMR TORO 400VA CHAS MT	0
62065 Talema	PWR XFMR TORO 25VA CHAS MT	0
70024K Talema	XFRMR TOROIDAL 5VA THRU HOLE	0
62043 Talema	PWR XFMR TORO 10VA CHAS MT	0
70014K Talema	XFRMR TOROIDAL 3.2VA THRU HOLE	0
62053 Talema	PWR XFMR TORO 15VA CHAS MT	98
70025K Talema	XFRMR TOROIDAL 5VA THRU HOLE	0
62041 Talema	PWR XFMR TORO 10VA CHAS MT	0
70060K Talema	XFRMR TOROIDAL 25VA THRU HOLE	373
70021K Talema	XFRMR TOROIDAL 5VA THRU HOLE	0
62080 Talema	PWR XFMR TORO 50VA CHAS MT	0
70044K Talema	XFRMR TOROIDAL 10VA THRU HOLE	313
3000MD-1-003 Talema	PWR XFMR TORO 3000VA CHAS MT	0
62063 Talema	PWR XFMR TORO 25VA CHAS MT	20

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.