Abstract
Quality taking and analysis of gas and oil samples upon actuation of gas protection is an essential component of transformer operation, in making a prompt decision on its admissibility to operation after an emergency shutdown. Existing conventional systems for taking, storage and transportation of gas samples from gas relays have a number of significant drawbacks. At the same time, the devices in use at present often fail to ensure the representative nature of samples; besides, when used in line with established rules, they are inconvenient in sampling and “combustibility” checks.To solve the aforesaid problem, a study has been performed at the facilities of the physical-chemical and chromatographic analysis laboratory of the diagnostics directorate of the branch of PJSC “IDGC of North-West” on a number of advanced technologies that could be used for taking, transportation and storage of gas samples. In the experimental study, 0.5 l gastight bags made by SKC (США) (models No.237-02 and No.232-02, differing in the design of the sampling system) and 0.5 l bags made by Elchrom (model EL-PACK G-300) were used. Experimental work on examination of gas-tight bags was carried out in two stages. At the first stage, gas-tightness was assessed at room temperature, and at the second stage, the effect of negative temperatures on gas-tightness was investigated.In the course of the experimental studies, the feasibilility was confirmed of using advanced Russian and foreign technologies for taking, storage and transportation of gas samples from transformer gas relays. The models of gas-tight bags under investigation are found to be appropriate for taking, storage and transportation of gas samples, both at positive temperatures of the ambient air, and at temperatures as low as minus 15–18°С (the effects of still lower temperatures was beyond the scope of the study). To establish the feasibility of repeated use of gas-tight bags, it is proposed to continue experimental studies.
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