Power industry solutions

Enterprise power system / thermal power / hydropower / nuclear power / State Grid

On-line monitoring of distributed power temperature

Application background

In recent years, China's sustained economic growth and rapid development of urban power grid demand the safety and reliability of power supply in modern society. As the most important part of the power supply chain, the high-voltage cable is the most important part of its safe operation. "Power production, safety first"

Article 1 the principle of "safety first and prevention first" must be adhered to in electric power safety production.

The goal of the second electric power safety production is to maintain the safety and stability of the power system, ensure the normal supply of power, prevent and stop the death of the human body, the large area blackout, the serious damage of the main equipment, the dam collapse, the major fire and other heavy accidents, as well as the accident which has a great impact on the society.

The third countries advocate and encourage the use, development and continuous promotion of electric power enterprises to ensure the safety and reliability of the power system and the advanced and applicable technical equipment and the use of scientific management methods to achieve technological innovation and management innovation in electric power safety production.

The distributed optical fiber on-line monitoring system (HG-DTS) developed by Hui sensing photoelectric can effectively monitor the temperature state of power cables in real time. Distributed optical fiber temperature sensing technology is the cutting-edge technology of modern optoelectronic technology, and is the latest achievement of photoelectric technology applied to industrial monitoring. The greatest advantage of this technology is to realize all optical transmission from the whole process of data collection to transmission, with high sensitivity and precision, with high insulation, small volume, light quality, radiation resistance, high temperature resistance, corrosion resistance, and no influence on the equipment to be measured. Single, safe, reliable, explosion-proof, fire resistant, high voltage resistant and strong electromagnetic interference.

System Architecture

software interface

On-line temperature monitoring of fiber Bragg grating power switchgear

Application background

According to statistics, the failure of power supply mainly appears in the following aspects:

The temperature and temperature of the three phase circuit of the high voltage switchgear in power plants and substations are abnormal.

The abnormal temperature of high voltage cables, cable ends and intermediate heads of power plants and substations.

The shaft temperature and temperature anomalies of large generators such as generating units and steam turbines in power plants.

The traditional temperature monitoring methods are mainly used by thermocouples, thermal resistance, semiconductor and other temperature sensing elements. These methods either have metal or need metal wires to transmit signals. In the compact switchgear, it is very difficult to realize the reliable edge of the system. But for non-contact infrared temperature measurement, it is easily disturbed by the environment and the surrounding electromagnetic field. At present, it is commonly used to make artificial non on-line temperature measurement by hand held infrared thermal imager or point measuring instrument. When the on-line monitoring is needed, the installation of the probe and the transmission of the temperature signal are also very difficult because the infrared thermometer needs to keep a certain distance from the measured point.

Fiber Prague grating (Fiber Bragg Grating, FBG) is used as a temperature sensing element for fiber Bragg grating temperature sensor. Because of its excellent insulation performance and electromagnetic interference resistance, the sensor can be installed directly on the exposed contact of the switch cabinet.

System Architecture