Temperature control and monitoring system for power transformer windings using fiber optic sensors
On-line monitoring of function and condition parameters and the efficiency of the cooling system are key elements in determining the working condition of transformers. This paper presents the implemented hardware and software solutions for carrying out the winding temperature on-line monitoring system using fiber optic sensors. The actual winding temperature is a measurand which defines the condition, load capacity and operating life of transformers. By carrying out the temperature control and monitoring system for power transformer windings using fiber optic sensors, ICMET Craiova aligned itself to the requirements of the international standards.
Thermal stress monitoring and pre-fault detection system in power transformers using fibre optic technology
As a major and most efficient equipment in electrical power system, power transformers requires more concentration on its fault monitoring and protection. The main cause of faults in power transformers are the stress due to both thermal and mechanical effects. The monitoring of the thermal stress/temperature of transformer oil and other parts can be used as a prime step to identify fault. Not only the temperature measurement, but identifying the measuring locations is also of greater importance. In this paper, a pre-fault detection system using optical fibre sensing technology has been proposed. Phosphorescence of the material has been used for the temperature sensing. Temperature of the selected hotspots of the transformers will be monitored continuously and fed back to the protection system including cooling systems. The protection equipments of the transformer can be activated well before the circuit breaker operates and the reliability of the system can be maintained. The proposed method of thermal stress monitoring and fault detection has been tested and validated on a 16 MVA transformer.
A Method Used for Measuring Temperature of Transformer Windings
The temperature of transformer windings is a main reason to effect the transformer life and is not directly measured with temperature detectors. This paper introduces an indirect simulated method to measure the temperature of transformer windings. The method can be used to monitor transformer effectively.