What is the best temperature monitoring technology for medium voltage switchgear

Faseroptischer Temperatursensor, Intelligentes Überwachungssystem, Verteilter Glasfaserhersteller in China

Why does Central Asia switchgear require temperature measurement

With the development of the national economy, the demand for electricity in various industries is increasing. The temperature of the contact points inside the high-voltage switchgear in power plants and substations increases with the increase of current. If the temperature of the contact points inside the high-voltage switchgear continues to rise, it will cause the temperature of the contact points inside the high-voltage switchgear to overheat, leading to overheating accidents of the switchgear temperature and resulting in fires and large-scale power outages. Deshalb, the workload of monitoring the safe operation of electrical equipment in the power system is rapidly increasing. The operation of units in power plants and substations is not independent of each other, but requires the coordination of various links in order to work safely, effectively, and reliably. The power supply of electrical equipment is mostly achieved through switchgear groups for transmission and distribution. If one of the switchgear fails, it will inevitably affect the operation of the entire substation or substation. Based on this, as the main parameter for the safe operation of electrical equipment in the power system, the monitoring task of the contact temperature of high-voltage switchgear in substations is becoming increasingly heavy.

Disadvantages of infrared thermometer for switchgear

Excessive temperature of power equipment will directly affect its reliability. If not detected and controlled in a timely manner, the severity of overheating will have a significant impact on the performance of insulation materials and equipment life. Low voltage equipment, due to its low voltage level, typically has a higher current and higher temperature compared to high voltage equipment. In the hot summer, higher environmental temperatures and higher loads are likely to cause a sudden increase in the temperature of low-voltage equipment, leading to equipment aging, insulation degradation, and in severe cases, equipment damage, short circuits, and ultimately power outages. At present, all public distribution rooms operate in an unmanned manner, and operators only use infrared thermometers to measure the temperature of the internal busbar and outlet cable heads of the low-voltage cabinet during regular inspections. They cannot monitor equipment temperature in real time online and cannot detect safety hazards of the equipment. In recent years, some power companies have begun to attempt online temperature measurement of high-voltage equipment in distribution networks. In fact, in the actual operation of distribution networks, there are much more equipment failures caused by high equipment temperatures in low-voltage networks than in medium voltage networks.

The necessity of monitoring devices for medium voltage switchgear

The medium voltage switchgear is an important electrical equipment in the transmission system. External current enters the main control switch inside the cabinet through wires, and then enters the sub control switch to connect with each branch; Each branch needs to be equipped with instruments, control and protection components, monitoring components, various AC circuit breakers and other control components to control, protect, measure, measure, and monitor the circuit.

As the usage time increases, the operating status of the switchgear will gradually deteriorate, and various signs of faults will gradually appear; For example, the conductive connections inside the switchgear may deteriorate the contact conditions due to electrical wear, mechanical vibration, and hidden defects in the equipment manufacturing process, causing an increase in contact point temperature. The temperature increase will further intensify the oxidation of the contact surface, forming a vicious cycle until insulation damage occurs, ultimately leading to arc discharge and equipment accidents. The insulation components inside the cabinet, due to long-term exposure to high voltage and strong electromagnetic fields, can also cause insulation aging and surface dust, ultimately leading to a decrease in insulation performance and causing accidents. The circuit breaker, due to being in operation for a long time without action, causes a decrease in the lubrication function of the moving parts of the operating mechanism, changes in mechanical characteristics, and affects the ability to open and close normal or fault currents, which can lead to accidents in severe cases.

Fluorescent fiber optic temperature measurement technology for switchgear

Fiber optic technology has its unique physical characteristics. The unique physical characteristics of fiber optic sensors are manifested in their fine diameter, resistance to electromagnetic interference, corrosion, high temperature resistance, and signal attenuation ratio, lightweight, and the integration of information sensing and transmission. They can effectively solve measurement problems that cannot be solved by conventional detection technologies. Fiber optic itself is a good insulation material, which can isolate the high voltage between the power system and electrical temperature measurement equipment, avoiding electrical equipment safety accidents caused by temperature measurement devices. Meanwhile, fiber optic devices are also excellent carriers for transmitting and sensing signals, solving the problem of electromagnetic interference in data transmission in the power system environment, making measurement results more accurate and reliable. In addition, due to the small diameter, light weight, and good flexibility of optical fibers, they can detect areas that ordinary sensors cannot detect. Fiber optic has these advantages, making fiber optic sensors increasingly widely used in online temperature measurement of electrical equipment in power systems. FJINNO’s independently developed switch cabinet fiber optic temperature measurement system is the most important temperature measurement technology for online temperature measurement of electrical equipment in high, medium, and low voltage switch cabinets.