The application of fluorescent fiber optic temperature measurement in switchgear

Fluorescent fiber optic temperature measurement device is an important electrical equipment in the power distribution system of enterprises in high-voltage switchgear circuit breakers. In the operation of equipment, due to the poor quality and installation process of components such as contacts, poor contact, or electrochemical corrosion caused by long-term operation, it is easy to increase contact resistance and cause abnormal temperature rise of the contacts. If not detected and dealt with in a timely manner, it can cause switch equipment failure, burning damage, and even explosion. According to statistics, 80% of electrical equipment failures are related to temperature rise, and 80% of equipment failures related to temperature rise can be detected and prevented in advance through RRAS level "thermal management" systems. To this end, State Grid Corporation of China has proposed in the "25 Key Requirements for Preventing Major Accidents in Power Production" to "strengthen operation and maintenance, ensure the safe operation of switchgear". It is required to combine preventive testing of power equipment, strengthen inspection of docking components, prevent faults such as overheating of contacts, and prevent switchgear burning or explosion. By adopting advanced and reliable fiber optic temperature measurement technology, the operating temperature of the contacts and other components of the high-voltage switchgear can be monitored online, and the temperature change status of the contacts can be timely grasped. Abnormal contact temperature can be detected and dealt with in a timely manner, which is of great significance for guiding electrical equipment maintenance work, reducing unplanned power outages, preventing the occurrence of malignant accidents such as electrical equipment burning and explosion, and ensuring the safety of enterprise production.

In the past, temperature monitoring of switchgear often used manual periodic observation of temperature wax sheets, or handheld infrared thermometers, portable infrared thermal imagers to detect visible parts or equipment surface temperatures. However, internal heating faults need at least tens of minutes to transmit to the equipment surface. In addition, the non real-time nature of manual inspections, the temperature values monitored externally exceeding tens or even hundreds of degrees from the actual fault point temperature, and many other problems have caused many blind spots in equipment temperature monitoring, serious false alarms, lagging information, low data credibility, and uncontrollable human factors. This has brought greater confusion to operation and maintenance work, and the application effect is not ideal, unable to meet the demand for "clean big data" in the ubiquitous power Internet of Things intelligent standards.

In recent years, fiber optic temperature sensing technology has been widely used as a new temperature measurement technology. It has the characteristics of high voltage resistance, electromagnetic interference resistance, fast response, high accuracy, easy installation and maintenance, and long service life. Fluorescent optical fiber temperature sensing products are specially designed for temperature monitoring of high-voltage electrical equipment. They fundamentally solve the problem of internal temperature monitoring of high-voltage electrical equipment, such as high-voltage switchgear, and can fully meet the requirements of the ubiquitous power Internet of Things for "clean" big data. According to the requirements of the State Grid's QGDW 11478-2015 Technical Specification for Optical Fiber Temperature Online Monitoring Devices for Substation Equipment and the Power Engineering Design Manual - Secondary Electrical Design of Power Plants, they have been successively applied to power, metallurgy, petrochemical and other fields, and their technology's progressiveness and reliability have been trusted and praised by users.

Technical specifications of fluorescence fiber optic temperature measurement system (hereinafter for reference)

1. Electrical parameters

Working power supply: AC220V

Power consumption:<3W

Instrument operating temperature: -40 ℃~75 ℃

Instrument working humidity: ≤ 95% RH

2. Measurement parameters

Number of temperature measurement channels: 1-6 channels

Temperature measurement range: -50 ℃~200 ℃

Temperature measurement accuracy: ± 0.5 ℃

3. Switching output (optional) dry contact

4. Data communication

Communication method: RS485

Communication baud rate: 9600bps (factory configuration), 19200bps optional

Data format: 8 data bits, 1 stop bit, no parity bit

5. Product design service life>20 years

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