Transformer sampling interface and sampling method

Abstract

The invention discloses a transformer sampling interface and sampling method. The transformer sampling interface comprises a sampling valve mounted at a transformer oil filling port or a dedicated sampling port, wherein the sampling valve comprises a cylindrical sealing core tightly connected to the transformer oil filling port or the sampling port and a needle valve nozzle connected to the frontend of the cylindrical sealing core. The sampling interface of the invention has the needle valve-type sampling valve mounted at the sampling port to ensure complete sealing during sampling, does notcontact air, and does not cause loss of dissolved gas in oil, so that oil sample test data is more accurate and reliable. Moreover, the small sampling valve is small in size and convenient to operate,has high controllability, ensures accurate control of oil flow size during sampling, and prevents waste of transformer oil.

Description

technical field [0001] The invention relates to a transformer sampling interface, in particular to a transformer sampling interface and a sampling method. Background technique [0002] In order to maintain and manage the transformer oil in operation, it is necessary to test periodically or as needed. At this time, oil sampling is required. At present, the sampling of transformer insulating oil in my country is in accordance with the standard of GB / T-7595-2007, but the current Transformer manufacturers have no uniform requirements for the installation of sampling valves. Many transformers do not have dedicated sampling valves. When taking oil samples, oil samples can only be taken at the oil filling valve port through ball valve control. This situation does not meet GB / T-7595 at all. -2007 requirements for transformer insulating oil sampling, and the ball valve is difficult to control accurately, oil leakage and oil sample spraying often occur, which seriously endangers the saf...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing transformer insulating oil sampling is difficult to control the sampling volume, and at the same time it does not meet the requirement that the oil sample is completely isolated from the air during the sampling process. The purpose is to provide a transformer sampling interface and a sampling method. The sampling valve with unique needle valve design can ensure that it is completely sealed during sampling, without contact with the air, without causing the loss of dissolved gas in the oil, so that the test data of the oil sample taken is more accurate and reliable; at the same time, the small sampling valve is small in size and easy to operate , with high controllability, to ensure accurate control of the size of the oil flow during sampling, and to prevent the waste of transformer oil

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