Specialty Transformers

Part Number	Description / PDF	Quantity
78253/35C Murata Power Solutions	XFRMR MAX250 4KVDC 2.5 MH DIP	1
78253/55MC-R Murata Power Solutions	MAX 253 TX 5V INPUT 5V OUT SMD	906
78250C Murata Power Solutions	XFRMR MAX250 1.5KVDC 2.5 MH DIP	198
78253/55JVC Murata Power Solutions	XFRMR 1:1.33 4KV SMD MAX253	2049
782100/55JVC Murata Power Solutions	TRANSFORMER, 5.0V-5.0V, 4KVDC, 1	191
78250JVC Murata Power Solutions	XFRMR 1:1 4KV SMD MAX250	0
78250JC-R Murata Power Solutions	XFRMR 1:1 SMD MAX250	500
78253/55JVC-R Murata Power Solutions	XFRMR 1:1.33 4KV SMD MAX253	48
78250JC Murata Power Solutions	XFRMR 1:1 SMD MAX250	0
782100/33VC Murata Power Solutions	TRANSFORMER, 3.3V-3.3V, 4KVDC, 1	46
78253/35JC-R Murata Power Solutions	XFRMR 1:2.27 SMD MAX253	647
782485/35C Murata Power Solutions	XFRMR 1:2.2 T/H ADM2485 ANLG DEV	0
78253/35MVC-R Murata Power Solutions	MAX 253 TX 4KVDC 3.3V IN 5V OUT	0
782100/53VC Murata Power Solutions	TRANSFORMER, 5.0V-3.0V, 4KVDC, 1	45
78250MC Murata Power Solutions	XFRMR MAX250 1.5KVDC 2.5 MH SMD	5503
78253/55JC Murata Power Solutions	XFRMR 1:1.31 SMD MAX253	3445
78253/35JC Murata Power Solutions	XFRMR 1:2.27 SMD MAX253	1453
78250MVC Murata Power Solutions	XFRMR MAX250 4KVDC 2.5 MH SMD	5478
78253/35MVC Murata Power Solutions	MAX 253 TX 4KVDC 3.3V IN 5V OUT	2183
78250MVC-R Murata Power Solutions	XFRMR MAX250 4KVDC 2.5 MH SMD	0

Specialty Transformers

1. Overview

Specialty Transformers are customized electromagnetic devices designed for specific applications requiring non-standard electrical parameters, isolation requirements, or environmental adaptability. Unlike general-purpose transformers, they are engineered to meet precise technical specifications in voltage conversion, signal isolation, impedance matching, and power conditioning. These transformers play critical roles in advanced power systems, medical equipment, industrial automation, and emerging technologies like renewable energy integration.

2. Major Types and Functional Classification

Type	Functional Characteristics	Application Examples
Isolation Transformers	Provide galvanic isolation with 1:1 turns ratio	Medical imaging equipment, industrial safety systems
Auto-transformers	Shared winding design for variable voltage adjustment	Voltage regulators in power distribution networks
Current Transformers (CTs)	Accurate current measurement with stepped-down output	Protective relaying in substations, energy meters
Potential Transformers (PTs)	Precise voltage scaling for metering and protection	Grid monitoring systems, circuit breaker controls
High-Frequency Transformers	Operate at 20kHz+ with ferrite cores	Switch-mode power supplies, wireless charging systems
Grounding Transformers	Create neutral points in ungrounded systems	Renewable energy plants, offshore platforms

3. Structure and Components

Typical construction includes:

Core: Cold-rolled grain-oriented silicon steel (CRGO) or ferrite materials
Windings: Copper/aluminum conductors with epoxy/polyester insulation
Insulation System: Combination of paper, varnish, and synthetic resins
Housing: Corrosion-resistant steel/aluminum enclosures with IP23-IP54 ratings
Cooling System: Air-natural (AN), air-forced (AF), or oil-immersed (ONAN) configurations

4. Key Technical Parameters

Parameter	Typical Range	Importance
Rated Power (kVA)	0.1-10,000	Determines load capacity and thermal performance
Voltage Ratio	1:1 to 1:100	Defines input/output voltage relationship
Frequency Range (Hz)	50/60, 400, 20k-100k	Dictates application suitability
Efficiency (%)	95-99.5	Impacts operational cost and thermal management
Insulation Class	A (105 C) to H (155 C)	Determines lifespan and safety margins
Short-Circuit Impedance (%)	4-15	Affects fault current limitation and voltage regulation

5. Application Fields

Power Systems: Grid substations, HVDC converter stations
Industrial: CNC machines, welding robots
Telecom: 5G base stations, fiber optic networks
Medical: MRI scanners, X-ray machines
Transportation: High-speed rail traction systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
ABB	Triton Isolation Transformer	Cast-resin design for marine environments
Siemens	SITRANS CT Family	0.1% accuracy class for energy metering
GE Grid Solutions	TXpert Smart Transformer	Integrated IoT sensors for condition monitoring
Schneider Electric	Harmonium HF Series	40kHz operation for data center UPS systems
Toshiba	H85-GT Grounding Transformer	Designed for 132kV renewable energy grids

7. Selection Guidelines

Key considerations:

Define exact voltage/current transformation ratio
Assess environmental conditions (temperature, humidity, vibration)
Verify compliance with standards (IEC 60076, IEEE C57.12)
Evaluate cooling requirements and installation space
Consider future expansion needs (15-20% capacity margin)

8. Industry Trends

Emerging developments include:

Adoption of amorphous metal cores for 80% lower no-load losses
Integration of fiber-optic sensors for real-time thermal monitoring
Development of planar transformers for EV charging stations
Implementation of digital twin technology for predictive maintenance
Advancements in nanodielectric insulation materials