On-line Monitoring Device for Dissolved Gases in Transformer Oil

1 Overview

    Under normal circumstances, the insulating oil and organic insulating materials within an oil-filled electrical equipment gradually age and decompose under the influence of heat and electricity, producing a small amount of various low-molecular hydrocarbons and carbon dioxide.One Oxygen.CarbonWait for gas, these Most of the gas dissolves in the oil. When there is latent overheating or discharge faults, it accelerates the production of these gases. As the failure progresses, the gases released form bubbles that disperse and diffuse through the oil, continuously dissolving. Gas Dissolved in Oil. Within transformers, when the gas generation rate exceeds the dissolution rate, a portion of the gas will enter the gas relay. The composition and concentration of the fault gas are closely related to the type and severity of the fault. Therefore, Analyze gases dissolved in oil to detect latent faults within equipment early and maintain real-time control of potential issues. Development of barriers.

    When gas is detected in the gas relay of a transformer, analyzing the gas can also help assess the condition of the equipment.

2 Scope of Application

    This guide applies to oil-filled electrical equipment, including transformers, reactors, current transformers, voltage transformers, and oil-filled bushings.

3 Inspection Cycle

    Pre-delivery inspections are conducted in accordance with relevant regulations and test data is provided.

    Equipment in operation and during commissioningSD 187—86Guidelines for Dissolved Gas Analysis and Judgment in Transformer Oil are now in effect.

2 Sample

1 Oil samples taken from oil-filled electrical equipment

1 Overview

    Ensure that the oil sample taken represents the oil in the entire oil tank. Generally, oil samples should be taken from the sampling valve at the lower part of the equipment. In special cases, samples can be collected from different sampling points.

    Sample size, for transformers and reactors with large oil volumes, etc.50～250mLFor equipment requiring minimal oil, take as little as possible, just enough to suffice.

2 Oil Sample Collection Container

    Please use glass with a tight seal.Note.RifleCollect oil samples.Note.RifleWhen filled with oil, the core can move freely. The movement can compensate for the volume change of oil with temperature, thereby balancing the internal and external pressures.

3 Method of Oil Sample Collection

    Typically, oil samples can be taken from power transformers and reactors while they are in operation. When sampling is required after shutdown, it should be done as soon as possible following the power-off. For sealed equipment that may generate a vacuum, precautions should be taken to prevent vacuum intake.

    The sampling valve should be equipped with a connector featuring a small nozzle, to which a hose is attached. Prior to sampling, air and "dead oil" within the sampling pipeline and valve should be expelled, and the pipeline should be flushed with oil from the equipment itself.(Reduce oil amount; this step can be skipped for the equipment.)When extracting oil samples, the oil flow should be gentle.