Dichlorodifluoromethane (R12)/CO2/Air Gas Mixtures a Competent Gaseous Insulator as Surrogate of SF6

Dichlorodifluoromethane (R12)/CO2/Air Gas Mixtures a Competent Gaseous Insulator as Surrogate of SF6

H.Shafqat Kharal*
Muhammad Kamran
Suhail A. Qureshi
Waqas Ahmad

Department of Electrical Engineering University of Engineering & Technology, Lahore 3600, Pakistan

Corresponding Author Email: 
April 25, 2018
| |
December 08, 2018
| | Citation

This work encompasses testing and manufacturing of a unique composite gaseous insulating material alongside its various valuations with the properties of existing insulating materials. Main objectives include the development of novel composite insulating mate-rial with enhanced insulating properties, reduced cost and supplementary ecological traits. Sulphur hexafluoride (SF6) is commonly used in current electrical insulation network but suffer sake recognized downside of having Global Warming Potential (GWP) 23,800 times larg-er than CO2. This alarming metric prompted investigation for substitute gases with minor environmental influences. The emerging con-tenders substantiated were dichlorodifluoromethane (R12) and its fusions with Carbon dioxide (CO2.) at different pressure and density mix for high-voltage applications. Gaseous mixtures containing R12 gas demonstrate good dielectric properties with low-temperature usage possibilities. Dielectric strength underneath quasi-uniform field demonstrated results in descending order (e.g. SF6> R12> CO2> Air) into direct current (DC) alternating current (AC) and impulse response examination. Density mixtures of (80:20%) for R12:CO2 reaches over 0.92–0.96 times to SF6 at 50 lbs./in2 keen on AC and (70:30%) for R12:Air mixtures bestow 0.80–0.90 times of sole SF6 properties. R12 offers wonderful self-recoverability and CO2 is instantly good in arc-quenching capabilities. The optimal ratio established for surrogates to SF6 gas is (70:30%) for R12: Air and (80:20%) for R12: CO2. All establishment and analysis are based on the authors’ experimental conditions and setup.


R12/CO2 mixtures; insulating material; dielectric properties; environment friendly

1. Introduction
2. Properties of SF6 and R12/CO2 GAS Mixtures
3. Laboratory Experimental Setup, Technrueand Assembly of Testelectrodes
4.1 Pure R12 and FS6
5. Conclusions
6. The Future of This Investigation
7. Acknowledgments

The authors thank HEC Pakistan for financial support to this work’s commencement. A statement of graceful acknowledgment is to our most respectful Prof. Dr. Rasheed (late) COMSATS Paki-stan for his guidance and project work support.


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