Why do power substations need to monitor temperature

Fiberoptisk temperatursensor, Intelligent övervakningssystem, Tillverkare av distribuerad fiberoptik i Kina

The development of the national economy has led to a rapid increase in electricity demand, and the scale of China’s power system construction has also been rapidly expanding. The coverage and circuits of the power supply network continue to increase, and a large number of substations are constantly being built. The development status of the power grid requires further reduction of substation construction costs, improvement of economic benefits and labor productivity, and assurance of power supply safety and quality to improve service levels for users while expanding capacity. For this purpose, the substation needs to adopt advanced technology to improve its automation level, and achieve unmanned duty and dispatch automation through the “fyra fjärrkontroll” function. While improving the safe operation level of substations, it is also necessary to ensure the stable performance and high reliability of substation automation equipment.

The primary equipment in the substation, especially the moving and stationary contact parts of the isolation switch and the cable head, have prominent thermal phenomena and a high failure rate. Especially due to the poor quality of cable joint production, loose crimping, and high contact resistance, equipment overheating can occur when the load increases, and in severe cases, it can lead to fire. Currently, most of the temperature monitoring of primary equipment joints still relies on regular completion by staff, which is time-consuming, labor-intensive, and extremely inefficient. Some temperature monitoring points or joints of power equipment are located in difficult to reach positions, and hidden dangers cannot be detected in a timely manner. To avoid such accidents, appropriate sensor technology should be used to monitor the temperature of primary equipment in a timely manner and improve power supply reliability.

During the expansion of the power grid, when primary equipment in the substation, such as isolation switch contacts, busbar transition points, and power cable incoming and outgoing lines, generate heat due to poor contact at the joints, it can cause insulation aging at the joints and lead to accidents. In actual operation, the gradual process of insulation degradation faults is also accompanied by abnormal heating at the fault point, specifically manifested as an abnormal increase in temperature at the fault point. Monitoring the operating status of a device by measuring the temperature of its isolation switch contacts and cable terminal joints is of great significance for ensuring the normal operation of the power system, improving operational reliability and automation.

In substations, plugs are generally used to connect busbars, isolating switches, high-voltage switchgear, circuit breakers, and cables. During the long-term operation of these primary equipment, the wire clamps and connecting plugs are prone to overheating due to poor manufacturing, transport, installation, and aging, which can cause excessive contact resistance. If the temperature of these heating parts cannot be monitored and timely maintenance is not carried out, it may ultimately lead to high contact temperature rise and even cause equipment fire accidents. Under de senaste åren, there have been incidents of blade cutting and cable head overheating in many power plants and substations, resulting in fires, large-scale power outages, and even “fire incidents”. Once a power outage occurs due to a malfunction, it first brings inconvenience to the people’s lives and interferes with the normal production and operation of the enterprise; Secondly, it causes significant losses to the power supply company; Furthermore, there are numerous tap joints for switchgear, samlingsskenor, and cables in the substation, forming a mesh and enclosed structure, making it very difficult to identify potential faults and wasting a lot of manpower and resources.

The functional characteristics of the fluorescent fiber optic temperature measurement system for power equipment:

① The fiber optic temperature measurement system can be practically applied in switchgear and ring main unit, and the temperature control implementation method has a reasonable structure;

② The fluorescent fiber optic temperature measurement system is easy to install and has an appropriate volume;

③ Fiber optic temperature measurement has good cost-effectiveness and meets the accuracy requirements for use;

④ The fiber optic temperature measurement system has strong anti-interference ability and can operate stably and reliably;

⑤ The fiber optic temperature measurement device has customizable temperature alarm temperature and functions such as over temperature alarm;

⑥ Real time display of multi-channel monitoring temperature;

⑦ Realize the display of over temperature action time, facilitating the recall of over temperature history in the operating environment;

⑧ Adapt to temperature measurement in various harsh environments.