The main causes of overheating in high-voltage vacuum circuit breakers can be summarized into the following five categories, covering aspects such as load, contact quality, installation process, and equipment maintenance:
Sudden Load Changes or Short-Circuit Impacts
When the power load changes abruptly (e.g., a sudden increase) or the circuit is subjected to a short-circuit current surge, the connection parts such as the circuit breaker's sprite contacts heat up due to the rapid increase in current. Under normal load, the temperature rise should be controlled below 75℃.
Contact Quality Issues
Material and Workmanship Defects: Low conductivity of contact materials, thin or peeling silver plating, and substandard spring material all increase contact resistance.
Poor Contact
Dimensional deviations between moving and stationary contacts (e.g., greater than 3mm), insufficient insertion depth, or insufficient spring tension in the Phillips head contact reduce the contact area.
Installation Process Issues
Assembly deviations between moving and stationary contacts, such as poor fit between the Phillips head and stationary contact, can lead to arcing and burning of the contact surfaces after prolonged operation.
Loose or insufficiently tightened fixing bolts affect contact stability.
Improper equipment maintenance
Dirty or oxidized contact surfaces increase contact resistance.
Aging spring performance leads to decreased contact pressure and accelerated temperature rise.
Other potential factors
Loose or oxidized connections (such as conductive rods and junction boxes).
Prolonged overload operation exceeding the design temperature rise range.
Summary
Overheating of high-voltage vacuum circuit breakers is the result of multiple factors. It is crucial to focus on checking contact quality, installation workmanship, and operation and maintenance. Promptly identify and address issues such as poor contact and material defects to prevent equipment failure.
Shaanxi West Power Tongzhong Electrical Co., Ltd.
Our address
Nanpo Village, Chencang Avenue Jintai District Baoji City, Shaanxi Province, China.
Phone Number
+86 18091767067(WhatsApp/Wechat/Telegram)
