High-Voltage Switchgear Temperature Monitoring System
High-voltage switchgear is important electrical equipment in power plants and substations. During long-term operation, contacts and busbar joints can heat up because of aging or excessive contact resistance. These temperatures are difficult to monitor, potentially leading to fires. Loose disconnector connections, oxidized or corroded switch surfaces and loose fastening bolts may go undetected during operation, causing overheating or serious accidents. Online temperature monitoring is therefore important for preventing accidents. Monitoring switchgear contact temperatures can effectively prevent fires, but cramped internal spaces prevent manual inspection and temperature measurement, making online monitoring essential for safe operation. FBG online temperature monitoring uses optical fiber for temperature sensing and signal transmission. Its excellent insulation isolates the high voltage inside the switchgear, allowing fiber-optic temperature sensors to be installed directly on high-voltage contacts for accurate online measurement. This addresses the difficulty of monitoring operating contact temperatures. The sensors use ceramic packaging, and the transmission cable is an outdoor fiber-optic cable with metal-free cladding for excellent insulation. AC power-frequency withstand-voltage tests were completed at Wugaosuo to meet switchgear withstand-voltage requirements. Lightning-impulse withstand-voltage tests were completed at the Beijing Electric Power Research Institute to meet the corresponding switchgear requirements. Spacing between adjacent sensors is controlled to prevent tracking and electrical breakdown even when the transmission cable is contaminated.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Temperature Measurement Accuracy | ±1℃ |
| Resolution | -0.1℃ |
| Temperature Measurement Range | -20~150℃ |
| Sensor Lifetime | 20 yr |
Datasheet
Supplier Information
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