Important electrical equipment such as high-voltage switchgear, high-voltage cable connectors, and knife switch switches are prone to surface oxidation and corrosion, loose fastening bolts, aging of electrical connection equipment, and other problems during long-term operation. In addition, many electrical equipment operate under overload for a long time, causing the temperature at the contact point of the problem to gradually rise, thereby accelerating oxidation and creating a vicious cycle. Even various safety accidents such as melting, combustion, and explosion may occur, resulting in irreparable losses.

At present, the monitoring methods for contact temperature of high-voltage cabinets are limited to manual inspection or traditional active temperature measurement of joints, body temperature and other parts, and there is no good online monitoring method for hidden dangers such as switch cabinet circuit breaker contacts; And there are a large number of equipment in the distribution room or substation, requiring a large number of high-quality maintenance personnel for equipment management.

• 2016year6moon18Day, ShaanxiExplosion Site of 330KV Nanjiao Substation

Cause of explosionThe temperature rise and explosion at the intermediate joint of the cable caused a flash explosion of combustible gas in the cable trench, resulting in a fault escalation;

After this accident, State Grid issued a safety accident report

• 2018year01The jumper wire on the overhead line of a substation in Jiangxi Province was burnt out, causing the line to trip.

• 2015year4moon20late8At that time, a certain person from HunanExplosion occurred at 220KV substation; Analysis suggests that insulation breakdown may be caused by aging of the cable head and circuit.

• 2014year11moon16Sunday evening7At that time, a fire broke out in a certain food company, causing18Death of people13 People are injured. The direct cause of the accident was the poor contact of the power supply line connector of the cooling fan laid along the wall in the fresh-keeping and constant temperature storage of the company, which led to overheating and short circuit, and ignited the polyurethane foam insulation material on the wall, causing a fire.

• 2012A fire broke out in the home of a villager in Bangchuigou Village, Zhuanghe City, Liaoning Province in,cause3Human death,The cause of the fire was poor contact in the electrical circuit of the knife switch in the villager's house.

……

For similar accident cases mentioned above, it is recommended to monitor the temperature of common hotspots in electrical equipment, and there are many common temperature measurement methods available

•Traditional temperature detection methods

•Innovative testing methods-Advantages of passive wireless temperature measurement

(IP68+EH power supply+low power consumption+contact type+wireless transmission)

Wireless temperature measurement solution for unmanned substations and box transformers

Real time monitoring of power equipment temperature, fault warning and alarm

◆ 3A current self powered, low power consumption, no heat generation, small size

◆Reliable communication, waterproof, dustproof, easy to install, maintenance free

Reduce system operation and maintenance costs, improve automation management level

• Comparison of service life with traditional active temperature measurement

• With2.4GComparison of Communication Distance for Transmission