• Product
  • Suppliers
  • Manufacturers
  • Solutions
  • Free tools
  • Knowledges
  • Experts
  • Communities
Search


MENU

What is are the Type of Temperature Indicator of Transformer?

Encyclopedia
Field: Encyclopedia
0
China

What is are the Type of  Temperature Indicator of Transformer?

Temperature Indicator Definition

A temperature indicator in transformers is defined as a precision device used for protection, temperature indication, and cooling control.

Construction of Temperature Indicator of Transformer

These indicators are provided with a sensing bulb. This sensing bulb is placed in a pocket on the roof of transformer tank. The pocket is filled with transformer oil. The bulb is connected to the instrument housing by means of flexible connecting tubing consisting of two capillary tubes. One capillary tube is connected to the operating bellow of the instrument and other to a compensating bellow. Compensating bellow compensates variation of ambient temperature. The pointer is fixed with a steel carriage on which normally four mercury switches are mounted. The make and break temperature of these mercury switches can be adjusted separately. One mercury switch is use to operate cooling fans, one mercury switch is used to switch on oil pumps, one mercury switch is for high temperature alarm and last switch is used to inter trip the transformer in extremely high temperature condition.


c13aaf2cbe0310c2b38d5cea18e6ca75.jpeg

Types of Temperature Indicator of Transformer

  • Oil temperature indicator (OTI)

  • Winding temperature indicator (WTI)

  • Remote temperature indicator (RTI)

Oil Temperature Indicator (OTI)

OTI measures the top oil temperature using a sensing bulb and liquid expansion to drive a pointer indicating temperature.

Operating Principle of Oil Temperature Indicator

This device measures top oil temperature with the help of sensing bulb immersed in the pocket by using liquid expansion in the bulb through a capillary line to operating mechanism. A link and lever mechanism amplifies this movement to the disc carrying pointer and mercury switches. When volume of the liquid in operating mechanism changes, the bellow attached to end of capillary tube expands and contracts. This movement of bellow is transmitted to the pointer in temperature indicator of transformer through a lever linkage mechanism.

Winding Temperature Indicator (WTI)

WTI measures winding temperatures using a sensing bulb heated by a coil, reflecting the current through the transformer winding.

d95ac9026423c79230dbe4ebb71a7f04.jpeg


Operating Principle of Oil Temperature Indicator

The basic operating principle of WTI is same as OTI.

Remote Temperature Indicator (RTI)

RTI uses a potentiometer as a transmitter to relay temperature data to a remote repeater.

Give a tip and encourage the author!
About experts
Encyclopedia
0
China
Expertise area
Encyclopedia
Professional article
1566
Recommended
More
Strange Devices on Transmission Lines: 5 Little-Known Practical Functions（1）
1 Aviation Warning SpheresAviation warning spheres, also known as reflective safety spheres, are used on overhead transmission lines near airports, especially on extra-high-voltage (above 220kV) lines and river-crossing transmission lines. Highly visible aviation marker spheres (aviation warning spheres) must be installed along the lines to provide warning signals.The aviation marker sphere (aviation warning sphere) has a diameter of ф=600mm. The sphere can be manufactured in various bright colo
Leon
09/04/2025
Transmission Line
In transmission lines, a "π" connection involves breaking the original line from Substation A to Substation B and inserting Substation C, forming a "π" configuration. After the "π" connection, the original single line is divided into two independent transmission lines. Following the "π" connection, Substations B and C may both be powered by Substation A (in this case, Substation C receives power via a feeder from Substation B's busbar, or possibly from another voltage point within Substation B);
Encyclopedia
09/04/2025
What are the principles of forced re-energization of transmission lines?
Principles of Forced Re-energization of Transmission LinesRegulations for Forced Re-energization of Transmission Lines Correctly select the forced re-energization end of the line. If necessary, change the connection configuration before forced re-energization, taking into account the reduction of short-circuit capacity and its impact on grid stability. There must be a transformer with its neutral point directly grounded on the busbar at the forced re-energization end. Pay attention to the impact
Edwiin
09/04/2025
Analysis of Accident Handling in Transmission Lines
Analysis of Transmission Line Fault HandlingAs a fundamental component of the power grid, transmission lines are widely distributed and numerous, often exposed to diverse geographical and climatic conditions, making them highly susceptible to faults. Common causes include overvoltage, pollution flashover, insulation damage, tree encroachment, and external damage. Line tripping is one of the most frequent faults in power plant and substation operations, with fault types including single-phase-to-
Leon
09/04/2025
About experts
Encyclopedia
0
China
Expertise area
Encyclopedia
Professional article
1566
Source professional electrical partners, experts, and explore smart grid & energy solutions.
Seed Inquiry
Download
Get the IEE Business Application
Use the IEE-Business app to find equipment, obtain solutions, connect with experts, and participate in industry collaboration anytime, anywhere—fully supporting the development of your power projects and business.
App Store App Store App Store App Store App Store App Store App Store App Store
App Store