A Winding Temperature Indicator (WTI) for Transformer is an essential transformer monitoring instrument used to measure the simulated hottest winding temperature of oil-filled transformers. Since transformer windings are enclosed inside the tank and cannot be measured directly during operation, the WTI combines the transformer oil temperature with heat generated by a Current Transformer (CT) operated heater to accurately indicate the winding hot-spot temperature. This enables operators to monitor transformer loading, control cooling equipment, and protect valuable electrical assets from overheating.
A reliable Transformer Winding Temperature Indicator plays an important role in transformer protection by providing continuous temperature monitoring. It helps prevent insulation damage, unexpected breakdowns, excessive loading, and costly maintenance while improving the overall safety and efficiency of the transformer. WTIs are widely installed on power transformers, distribution transformers, furnace transformers, renewable energy transformers, and industrial electrical systems where dependable temperature monitoring is essential.
 
Key Features
Accurate winding hot-spot temperature indication
CT-operated heater simulation for reliable measurement
Adjustable alarm, trip, and cooling fan control contacts
Clear analog temperature display
Rugged and weather-resistant construction
High-quality capillary and sensing bulb system
Long operational life with minimal maintenance
Stable performance in demanding industrial environments
Easy installation on new and existing transformers
Suitable for continuous operation
 
Technical Specifications
Our Winding Temperature Indicators are available in various configurations to meet different transformer requirements.
Application: Oil Filled Power & Distribution Transformers
Temperature Measurement: Simulated Winding Temperature
Operating Principle: Oil Temperature + CT Heater Simulation
Display Type: Analog Dial
Contacts: Alarm, Trip & Fan Control
Mounting: Transformer Tank Mounted
Enclosure: Weather Resistant
Capillary System: Stainless Steel
Accuracy: High Precision
Suitable for Indoor & Outdoor Applications
 
Applications
The Winding Temperature Indicator for Transformer is widely used in numerous industries and electrical installations where transformer protection is critical.
Typical applications include:
Power Transformers
Distribution Transformers
Utility Substations
Solar Power Plants
Wind Energy Projects
Transformer Manufacturing Companies
EPC Projects
Electrical Contractors
Steel Plants
Cement Plants
Chemical Industries
Paper Mills
Railways
Data Centres
Commercial & Industrial Power Systems
 
Benefits of Winding Temperature Indicator
A high-quality Transformer Winding Temperature Indicator helps improve transformer reliability by continuously monitoring operating temperature and warning operators before dangerous overheating occurs. Early temperature detection reduces insulation ageing, minimizes transformer failures, extends equipment life, and lowers maintenance costs.
 
Frequently Asked Questions
What is a Winding Temperature Indicator?
A Winding Temperature Indicator (WTI) measures the simulated hottest winding temperature of an oil-filled transformer by combining oil temperature with heat generated by a CT-operated heater.
 
Why is a WTI required in transformers?
A WTI helps prevent transformer overheating, protects insulation, extends transformer life, controls cooling systems, and improves overall operational safety.
 
Can a WTI control cooling fans?
Yes. Most WTIs are equipped with adjustable contacts that automatically operate transformer cooling fans or pumps based on temperature settings.
 
Where is the WTI installed?
The instrument is mounted on the transformer tank and connected through a sensing bulb, capillary tube, and CT-operated heater arrangement.
 
What transformers use WTI?
WTIs are commonly installed on power transformers, distribution transformers, generator transformers, furnace transformers, renewable energy transformers, and industrial transformers.