Opmizaon of work on taking gas samples from transformer gas relays

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.

1. Power transformers: a reference book. Ed. S. D. Lizunov, A. K. Lokhanin. Moscow: Energoizdat 2004;: 1–616.

2. A manual for the study of the Rules for the Technical Exploitation of Electric Stations and Networks (electrical equipment). ed. by F. L. Kogan. Moscow: NC ENAS 2007;: 1–352.

3. Vysogorets S., Daryan L., Obraztsov R., Osipov L. Emergency set for gas protection of the transformer. Magazine "Electricity. Transmission and Distribution» 2015; 5 (32): 106–111.

4. РД 153-34.0-35.518-2001. Instruction for exploitation of gas protection. Moscow: SPO ORGRES 2001;: 1–45.

5. РД 34.46.502. Instruction for determining the nature of transformers internal damages by analyzing gas from a gas relay. Moscow: Glavtechupravlenie 1979;: 1–7.

6. РД 153-34.0-46.302-00. Methodical instructions for the diagnosis of developing defects in transformer equipment based on chromatographic analysis of gases dissolved in oil. Moscow: Technormativ 2007;: 1–30.

7. Instruction for sampling of transformer oils. Approved by the decree of the "Komienergo" branch of JSC "IDGC of the North-West" from 10.09.2012 №469. Syktyvkar 2012;: 1–45.

8. RD 34.46.501 (SO 153-34.46.501). The instruction on transformers exploitation. I72 Compiled by: Fufurin N. P. 2nd ed. Moscow: Energia 1978;: 1–80.

9. Daryan L. A., Korobeinikov S. M., Bychkov A. L. Modeling of as leakage from sampling containers with a fl exible shell. ELEKTRO. Electrical engineering, electric power industry, electrotechnical industry 2013; 1: 28–31.

10. МКХА 03-03. Methodics for quantitative chromatographic analysis of gases dissolved in transformer oil and determination of the total gas content of degassed oil. Part 1. Determination of diagnostic gases dissolved in transformer oil, 2003 (Certifi cate of attestation of МВИ No. 2420 / 150-03 from 22.05.2003);: 1–20.