Address: Dongjiao Development Zone, Fenghua City, Zhejiang Province
71 Tianfeng Road
The power equipment is affected by production quality, installation quality, operating time, frequency of use, and working environment, resulting in unreliable contact at the installation site, and the temperature rise exceeds the allowable range specified by the country, making the cable terminal insulation aging and even breakdown damage. Serious consequences. The temperature of the cable waterproof joint is an important parameter reflecting its operating status. The direct cause of the temperature rise of the cable waterproof joint is the long running time of the joint, the tightness of the compression joint, and the excessive contact resistance. Overheating, burning through insulation and other phenomena caused by long-term operation of the joint are likely to cause fire, which will cause major safety accidents and economic losses.
The cable joint is overheated to the occurrence of an accident. Its development speed is slow and it takes a long time. The traditional manual inspection method has low reliability and poor real-time performance, and it is difficult to find equipment safety risks in time. Therefore, how to effectively monitor and control the temperature of the cable joint effectively has important practical significance.
In the power system, the temperature of the joint is too high due to factors such as excessive contact resistance and overload of the cable joint, which causes poor insulation at the joint or a sudden accident caused by fire, which causes serious safety risks to industrial production and even causes Severe accidents in which the equipment is forcibly shut down and production cannot be resumed in a short period of time reduce the reliability of safe operation of the power grid and cause significant economic losses.
The cable waterproof joint is the weakest link of the power cable. The longer the running time, the more prone to overheating and burn-through accidents. The joint temperature is an important indicator to measure whether the insulation status of the cable joint is good during operation, and its temperature change is caused by the current passing through the internal conductor under normal operating conditions. When the cable is running under normal load, the temperature inside the connector is about 90 ° C; when the cable is running at full load, the temperature of the connector will reach about 250 ° C; when the temperature increases again, the oxide film at the connector thickens, and the contact resistance varies with If it is increased, the insulation medium of the joint will be decomposed and carbonized into non-insulators under the effect of a certain energizing time, resulting in failure. Therefore, accurately understanding the temperature of the core of the cable connector is of great significance for monitoring the normal operation of the cable connector.