Recent Development of Two Alternative Gases to SF6 for High Voltage Electrical Power Applications

For many years, SF6 has been the preferred dielectric medium in electrical power applications, particularly in high voltage gas-insulated equipment. However, with the recognition that SF6 has an extremely long atmospheric lifetime and very high global warming potential, governments have pursued emission reductions from gas-filled equipment. The electrical power industry has responded to this environmental challenge applying SF6-free technologies to an expanding range of applications which have traditionally used SF6, including gas-insulated switchgear, gas-insulated circuit breakers and gas-insulated lines or bus bars. Some of these SF6-free solutions include gas mixtures containing fluorinated compounds that have low climate impact, among them, a fluoronitrile and a fluoroketone developed as 3M™ Novec™ 4710 Insulating Gas and 3M™ Novec™ 5110 Insulating Gas, respectively. Both fluoronitrile and fluoroketone mixtures are successfully used in gas-insulated equipment currently operating on the grid where they reduce greenhouse gas emissions by more than 99% versus SF6. This paper reviews these leading components of alternative-gas mixtures with updates on the performance, safety and environmental profiles in electrical power applications.

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Performance of SF6 Gas Mixtures in High-Voltage Circuit Breakers

Gaseous Dielectrics IX ◽

10.1007/978-1-4615-0583-9_62 ◽

2001 ◽

pp. 455-460

Author(s):

Hartmut Knobloch ◽

Bernd-Ulrich Habedank

Keyword(s):

High Voltage ◽

Gas Mixtures ◽

Circuit Breakers

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Future 400 kV Algerian network and radio electric disturbances in dry weather and under rain

Serbian Journal of Electrical Engineering ◽

10.2298/sjee0702207b ◽

2007 ◽

Vol 4 (2) ◽

pp. 207-221

Author(s):

M. Brahami ◽

A. Tilmatine ◽

A. Kanssab ◽

A. Bendaoud

Keyword(s):

Electric Fields ◽

High Voltage ◽

Electrical Power ◽

Radio Interference ◽

Power Networks ◽

High Electric Fields ◽

Simulation Programme ◽

Harmful Effects ◽

Very High ◽

Disturbance Field

The development of the electrical power networks to very high voltage (V.H.V) reveals problems involved in the high electric fields; it is essential to consider it in the design of installations in order to avoid or to mitigate some problematic or dangerous effects. Among the most important harmful effects, we can note the "radio interference disturbances". The principal aim of this paper is the use of a simulation programme using an analytical method based on the theory of propagation modes, made by one of the authors, for determination and calculation of the exact profile of disturbance field of actual high voltage lines (220 kV) and in project (400 kV) in dry weather and under rain. Specific software called "effect corona" was developed for this purpose.

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Analysis of Last Development Results for High Voltage Circuit-breakers Using New G3 Gas

Plasma Physics and Technology Journal ◽

10.14311/ppt.2017.2.157 ◽

2017 ◽

Vol 4 (2) ◽

pp. 157-160 ◽

Cited By ~ 3

Author(s):

P. Robin-Jouan ◽

K. Bousoltane ◽

Y. Kieffel ◽

J. Y. Trepanier ◽

R. Camarero ◽

...

Keyword(s):

Global Warming ◽

High Voltage ◽

Global Warming Potential ◽

Gas Mixture ◽

Test Results ◽

Chemical Behavior ◽

Circuit Breakers ◽

Simulation Tools ◽

Environmental Friendly

Among many alternative gases proposed to replace SF6 as insulating gas, g3 (green gas for grid), fluoronitril based component officially introduced at CIGRE 2014, can be now used for insulation projects and new environmental friendly circuit breakers. This gas mixture g3, presents a reduction of the global warming potential by 98% compared to SF6 gas and shows quite good dielectric withstand capability. Many new investigations about thermal and chemical behavior have been done and are precised in this paper. Last switching test campaigns will be presented for 145 kV applications. Simulation tools should be updated to be applicable to these projects. Developments and comparisons with last test results will be analyzed.

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