1. Ensure environmental benefits

Environmental protection needs of replacing SF6 ‌

As an ideal substitute for SF6, C4F7N has a global warming potential (GWP) of less than 10% of SF6, but it may still cause environmental risks after leakage. Effective monitoring can reduce greenhouse gas escape and ensure that its environmental advantages are transformed into actual emission reduction results.

Stability management of mixed gas ‌

C4F7N is often mixed with CO2. Leakage may cause an imbalance in the proportion of components, which in turn affects the insulation performance. Real-time monitoring can maintain the stability of the gas mixture ratio.

2. Ensure safe operation of equipment

Insulation performance depends on high purity ‌

The insulation strength of C4F7N is more than twice that of SF6, but leakage will cause the purity of the gas to decrease, which directly threatens the insulation capacity of electrical equipment. The monitoring device can quickly identify the leakage point and prevent equipment failure.

Risk control in high-pressure environment ‌

The pressure of C4F7N/CO2 mixed gas in the equipment is as high as 0.14-0.6 MPa. Leakage may cause a sudden drop in pressure and lead to insulation failure. High-sensitivity detection technology can timely warn of abnormal air pressure.

3. Compliance with industry standards and specifications

Mandatory requirements of detection standards ‌
National standards (such as GB/T 37185-2018) and power industry standards (such as DL/T 1482-2015) clearly stipulate the detection accuracy, error range and other indicators of C4F7N and its decomposition products. Leakage monitoring must meet standardized processes to ensure compliance.

Toxicity control of decomposition products ‌
C4F7N may generate toxic decomposition products under the action of electric arc. Portable detectors can achieve rapid on-site identification and ensure the safety of operation and maintenance personnel.

4. Promote technology application and industrial development

Support for the promotion of domestic equipment ‌
China Electric Power Research Institute has achieved the domestic preparation of C4F7N, and the supporting leakage monitoring technology provides safety for the large-scale application of domestic environmental protection equipment.

Intelligent detection technology upgrade ‌
Intelligent leak detectors based on sensors and wireless communications can remotely monitor gas status, support data analysis and predictive maintenance, and promote the transformation of power equipment operation and maintenance mode.

5. How to monitor perfluoroisobutyronitrile (C4F7N) gas leakage?

NDIR non-spectral infrared sensor

Application: Leak detection is achieved through the characteristic absorption peak of C4F7N in the infrared band, supporting a range of 0-3000ppm.

Scenario: Suitable for fixed online monitoring systems, which can be integrated into substations or GIS equipment.

Online monitoring of high-voltage equipment: NDIR infrared perfluoroisobutyronitrile (C4F7N) sensor GC5G1 is preferred. It has a long life of 10 years and has a self-calibration function, meeting the needs of long life, maintenance-free, and continuous monitoring.