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The need for gas analysis

The quality of SF₆ is affected by gas handling, by electrical discharges ranging from partial discharge up to power faults, and by gas compartment leaks. Consequently, SF₆ gas analysis may be required for a number of reasons:

• To measure the quality of the gas in operating equipment, or in storage vessels for reuse with respect to the international standard IEC 60480
• To determine the appropriate safety procedures for maintenance work based on the level of decomposition by-products
• To provide diagnostic information on the nature of partial discharges and other deterioration of the insulation system
• To locate an electrical fault

Strategy for gas sampling and analysis

In consultation with the client, Kinectrics’ experts will select the appropriate tests to be performed. The type of test chosen determines the type and size of gas sample required. We can provide sample bottles, or recommend specifications for sample containers. Kinectrics also offers assistance with procedures for taking and shipping gas samples.

Some gas analyses can be performed on site using portable analyzers and Kinectrics can provide two types of portable analyzers complete with instructions:

• A humidity meter to determine water content
• A decomposition analyzer for fault location

Training is available, or we can provide a complete service at your location.

The standard analysis measures the concentration of two decomposition products, SOF₂ and SO₂F₂, and the concentration of CF₄, to the part per million level.

Previous investigations have shown that these compounds are indicative of the total level of contamination as a result of electrical discharge; they provide the necessary diagnostic information for most situations. Additional analysis can determine the air content, measured as the concentration of nitrogen and oxygen. Other gaseous contaminants can be detected on request.

Every report of analysis includes an interpretation of the results, linking the measurements to the operation of your equipment.

For more information, contact

Hugh Morrison, 416.207.6000 x6731, hugh.morrison@kinectrics.com