Original
By certification 
1. Product Introduction
Transformers winding hot points is the highest temperature in the insulation system of the winding. It is well known that the short-term effects of transformers overheat are reduction in insulation, temporary deterioration of mechanical characteristics, and reductions in short circuit intensity. In the long run, the life of the transformer will be shortened, aging of the Insulation materials will be accelerated, and sealant will become brittles. That is to say, winding overheat during operation affects the safety and life of transformers.
Cooling control of power transformers is traditionally provided by a winding temperature indicator (WTI) that is based on a measurement of the top-oil temperature and a simulation of the winding hottest spot temperature. This method has some drawbacks and utilities are now applying more fiber optic temperature sensors & monitoring system for this critical function.
The fiber optic temperaturesensors are of extremely high di-electrical strength and can be installed directly onto windings without causing insulation or PD issues. The monitors are of up to 16 channels, can communicate directly with SCADA system through RS485 or other smart communication protocols. It also allows users to control the cooling efficiency and provide trends/alarms in real-time.
2.Product Specification
Model No. |
HQ-E116 |
Temperature Range |
-40℃-260℃ |
Temperature Accuracy |
±1℃ |
Temperature Resolution |
0.1℃ |
Number of Channels |
Upto 16 channels |
Temperature Unit |
℃ or ℉ |
Display Mode |
Digital tube display, display directly if less than 8 channels, display in turn if more than 8 channels |
Response Frequency |
2 seconds per channel (Depend on probes’ position) |
Power Supply |
24V DC |
Digital Interface |
Two RS-485 USB Analogue ouput: 4-20mA 8 relays |
Memory |
1GB memory space, flash drive (USB port) accessible |
Power Consumption |
≤10W |
Communication Protocol |
Modbus (IEC 61850 customizable) |
Fiber Optic Length |
Per requirement |
3. Installation diagram
4. Main advantages of using fiber optic temperature sensors in transformers are:
● Accurate, direct temperature reading of winding hot spots
● Predicts or adjusts the dynamic loading of high voltage transformers
● Prevents premature failures
● Provides cost effective monitoring of transformers temperature
● Extends transformer life and helps estimate the insulation degradation rate
● Complements predictive hot-spot algorithm simulations
5. Project Reference
http://www.herchopto.com/
