Analysis of the composition and content of dissolved gases in oil is one of the most effective measures to monitor the safe operation of oil-filled electrical equipment. Transformer oil chromatography online monitoring system (multi-component principle) is a transformer oil chromatography online monitoring product based on gas chromatography technology. The system can detect the contents of all components such as H ₂ , CO, CO ₂ , CH ₄ , C ₂ H ₂ , C ₂ H ₄ , C ₂ H ₆ and micro water in the transformer oil online according to the set period. Then, through the expert system, it is judged whether there is a latent fault, whether it is an overheat fault or a discharge fault, and an audible and visual alarm is performed according to the set alarm value.

        The working principle is as follows: in the gas separation module, the gas flows through the column to realize separation of a plurality of gases, and the separated gas is converted into a signal from a chemical signal to an electrical signal in a chromatographic detection system. The electrical signal is collected by the data acquisition module and then uploaded to the data and spectrum analysis software system through the communication port and the communication network. The system can perform spectrum analysis and calculation, and automatically calculate the concentration value of each gas according to the gas calibration data. According to the gas concentration value, the fault diagnosis system automatically diagnoses the transformer running state by using the transformer fault diagnosis algorithm in the software system. If the abnormal system is found, the internal fault type of the transformer can be diagnosed and the maintenance suggestion is given.

Third, the process standard

        (1) Check that the pressure indications are normal, and there is no leakage of gas in each gas pipeline.

        (2) The oil leakage site is clean and does not leak.

Fourth, the work process

        (1) Replace the cylinder

        Preparation work

        Prepare a sufficient amount of tools, such as combination wrenches, cylinders, soapy water, etc., as needed.

        2. Replacement process

        (1) Turn off the power of the field data collector first.

        (2) Close the carrier gas cylinder valve, remove the fixed carrier gas hoop, and loosen the connection between the carrier gas cylinder outlet and the pressure reducing valve (counterclockwise loosening) (see Figure 3-5-55).

        (3) Take out the cylinder and take out the new carrier gas cylinder (note that the newly replaced carrier gas meets the requirements).

        (4) Wipe the newly replaced carrier gas cylinder outlet and check if there is any abnormality in the interface. If there is no abnormality, connect the pressure reducing valve to the carrier gas cylinder outlet and tighten it (clockwise tighten).

        (5) First loosen the pressure reducing valve regulating valve completely (counterclockwise), then open the carrier gas cylinder valve, and check the pressure gauge of the high pressure side of the pressure reducing valve to adjust the pressure regulating valve slowly (clockwise) Make the pressure gauge low pressure side pressure gauge indication reach 0.4MPa (see Figure 3-5-56).

        (6) Check the presence or absence of air bubbles on the joints of the carrier gas cylinder and the carrier gas circuit with soapy water to check whether the carrier gas circuit joint is leaking when replacing the carrier gas. If there is no air bubble in each joint, the description The joints of the gas circuit are not leaked, and the replacement of the carrier gas is completed.

        (2) Oil leakage treatment

        Preparation work

        Prepare a sufficient amount of tools, such as combination tools, cleaning agents, rags, etc., as needed.

        2. Process

        (1) Turn off the power to the field data collector.

        (2) Close the inlet and outlet ports.

        (3) Treatment of oil leakage points.

        (4) If the oil pipe is seriously leaking or the oil pipe is broken, the responsible person should be notified.

Five, cleaning precautions

        (1) Pay attention to the leak detection of the newly replaced carrier gas cylinder to prevent air leakage at the interface of the carrier gas cylinder itself.

        (2) Leak detection is required after any operation of the carrier gas circuit to prevent air leakage from the carrier gas circuit.

        (3) After replacing the carrier gas, please ensure that the carrier gas cylinder valve is open and the pressure reducing valve regulating valve is in the working state of 0.4MPa.

        (4) When closing the inlet and outlet ports, the data collector must be powered off first.