The best temperature measurement system manufacturer in Asian power equipment-INNO

Why do high-voltage power systems need misurazione della temperatura
The reliability of high-voltage switchgear under high voltage and high current conditions is closely related to the temperature rise of the isolation switch contacts. Durante il funzionamento della rete elettrica, vibrazioni meccaniche, erosione da contatto, e altri motivi possono peggiorare le condizioni di contatto, aumentare la resistenza di contatto, provocare un aumento della temperatura dei punti di contatto, aggravare l'ossidazione della superficie di contatto, e provocare saldature locali o scarica dell'arco nei punti di contatto allentati, provocando infine danni alle apparecchiature elettriche, interruzioni di corrente, o incidenti gravi come gli incendi. Questo tipo di incidente dovuto a surriscaldamento dei contatti non è dovuto solo al problema di qualità dell'interruttore dell'armadio ad alta tensione stesso, ma soprattutto, a causa della mancanza di metodi di monitoraggio efficaci per l'aumento della temperatura dei contatti dell'interruttore di isolamento. With the rapid development of the national economy, the scale of engineering construction is increasing year by year, and urban supporting facilities are improving year by year. Di conseguenza, the demand for power cables will increase year by year. Tuttavia, the current power cables on the market lack online temperature monitoring function.

With the development of the power system, the voltage and current of cable loads are constantly increasing, which inevitably leads to the temperature rise of cables approaching the limit temperature during operation; During abnormal operation of cable joints and power systems (such as overload, short circuit tripping, ecc.), abnormal temperature rise of cables may also occur; How to effectively monitor the temperature changes of cables during operation and operation is an important issue to ensure the safety of the power system, and it is of great significance for the production and daily life of using electricity.

The 66kV-500kV high-voltage power cable line is the backbone transmission line of our country. Its stable operation, safety and reliability are directly related to the national economy, people’s livelihood, and social development. The structure of high-voltage cables is mainly composed of conductors, isolamento, metal shielding, and non-metallic outer sheaths. Traditional ultra-high voltage temperature measuring optical fibers are placed on the surface of the insulated fiber core, and the measured temperature is the surface temperature of the insulation, rather than the actual operating temperature of the conductor, and the metal shielding is mostly made of wrinkled aluminum sheaths. Negli ultimi anni, the proportion of power system power supply interruptions caused by cable fires has been on the rise in power system fire accidents, which have caused huge losses to the national economy, people’s property, and personal safety.

Power equipment generates a large amount of heat during high load operation. If the temperature inside the equipment is not timely understood and corresponding measures are not taken when the external temperature is too high, the normal operation of power equipment will be affected due to high temperature, and even equipment damage may occur,

Accidents in the power system often occur due to overheating of critical parts of high-voltage live equipment or high load sections of wires. The hazards of such accidents are extremely high, ranging from minor damage to equipment and affecting usage
Household electricity can cause a short circuit in the transmission line, resulting in a large short-circuit current and burning out the main transformer. Perciò, real-time online monitoring of the temperature of the transmission line is an important aspect of ensuring the safe operation of the power grid.

Temperature measurement methods for power equipment

1. Resistance temperature measurement method

According to the principle that the resistance of a wire increases as the wire temperature increases. To measure the temperature rise of the motor winding.

2. Using handheld infrared thermometer or thermal imaging thermometer

The handheld thermometer is severely affected by the professional quality and environmental conditions of the photographer, and cannot monitor the operation status of power equipment in real time. The temperature measurement data cannot truly reflect the status of the equipment under specific environmental conditions, and there are also problems in accurately locating the detection parts of the equipment; Attualmente, online infrared temperature monitoring is being carried out both domestically and internationally, but the temperature measurement method is rough and cannot achieve the goal of accurate temperature measurement of key parts of power equipment. Inoltre, these temperature measurement methods are often limited to thermal image capture, post analysis, or limited to measuring a fixed number of temperature objects in the same image. Traditional temperature measurement methods generally use thermocouples or infrared monitoring, but in high-voltage cable applications, thermocouples that transmit signals through metal wires have high-voltage safety issues; Non contact temperature measurement based on infrared technology is inconvenient to install and has high temperature
Degree measurement is susceptible to environmental interference and other issues.

3. Misurazione della temperatura senza fili

The biggest drawback of wireless is the lifespan of the battery and its susceptibility to external interference.

4. Misurazione della temperatura in fibra ottica

I sensori di temperatura in fibra ottica sono principalmente sensori di temperatura a fluorescenza distribuiti e in fibra ottica. Utilizzo della fibra ottica per trasmettere segnali di temperatura, la fibra ottica ha buone prestazioni di isolamento e non è influenzata dall'alta tensione all'interno del quadro. Il sensore di temperatura a fibra ottica può essere installato direttamente sui contatti ad alta tensione all'interno del quadro, misurare con precisione la temperatura di lavoro dei contatti ad alta tensione e completare il monitoraggio online della temperatura di lavoro dei contatti del quadro.