During the long-term operation of the contacts and connection points of electrical equipment such as switches, switches, cables, etc., due to aging, looseness, pollution, substandard equipment installation process, overload operation and other problems, the gap or contact resistance of the connection parts increases. Under the action of electric current, it causes heating and temperature rising. The mechanical strength and physical properties of electrical equipment will decrease due to long-term high temperature and overheating, while the continuous through-current state will accelerate the oxidation of the connecting parts, resulting in further increase of contact resistance and temperature. This vicious cycle process, seriously affects the service life of electrical equipment, and brings a great threat to the safe and stable operation of the power grid. Therefore, it is very necessary to monitor and forewarn the temperature change of power equipment, especially the electrical connection point in real time.

 

Technical characteristics

 

         SAQE switch cabinet temperature rise warning arc explosion-proof system real-time monitors the temperature of bus bar, dynamic and static contact of breaker, cable head and other connections in the switch cabinet. When the heating temperature of each connection exceeds the set value, the system will send a temperature alarm signal to effectively prevent the temperature rise failure of the switch cabinet. At the same time, install the arc light sensor in the cable room. The arc light sensor is facing each connection point to detect the arc light signal. In case of arc light, the fault source can be cut off within 7 ms to minimize the harm of arc light to the equipment. The protection action logic of the whole system can be programmed by three criteria logic: "temperature", "overcurrent" and "arc light". In the shortest time, the arc fault caused by normal heating aging or sudden reasons can be removed, and the arc light explosion-proof function of temperature rise warning of the switch cabinet can be fully realized.

 

Scope of application

 

transformer substation：It is suitable for on-line temperature monitoring of outgoing switch cabinet, main transformer switch cabinet, knife gate of buscouple switch cabinet, bus connection point, breaker contact and Outdoor Disconnector.

 

distribution network：It is suitable for on-line temperature monitoring of distribution network switching station, ring network cabinet, line switch, distribution transformer, cable branch box and cable intermediate joint.