Power electrical transformer for urban rail transit

Abstract

The invention discloses a power electrical transformer for urban rail transit. The power electrical transformer structurally comprises a box body, an oil discharge pipe, a box door, a sleeve, a fixing plate and a transformer body, the box door is arranged at a box opening of the box body, the fixing plate is fixedly connected to the inner wall of the box body, the oil discharge pipe penetrates through the fixing plate and extends into the transformer body, and the bottom of the transformer body is sleeved with the sleeve; a strong assistance structure and a top expansion device are arranged in a corrugated layer, a sliding groove in the bottom of the strong assistance structure is matched with a hemispherical pad, the pipeline expands to extrude the top expansion device at the moment that gas in the oil discharge pipe is suddenly increased and cannot be discharged, and then the strong assistance structure is bent along the layer wall due to upward movement of the top expansion device and is clamped in a sharp-tooth-shaped groove of the clamping seat to resist negative pressure in the oil discharge pipe, so that deformation between the corrugated layers is avoided, acceleration dragging, even small-range damage and bursting in the oil discharge pipe are prevented, and the service life of the transformer is prolonged.

Description

technical field [0001] The invention relates to the field of electrical equipment, in particular to a power electrical transformer used in urban rail transit. Background technique [0002] In the subway system, the transformer is an essential equipment. Among them, the locomotive traction transformer is an important part of the AC electric locomotive. Appropriate voltage, the commonly used traction transformer is an oil-immersed transformer with good heat dissipation effect, so that the existing power electrical transformer will have the following disadvantages when used: [0003] Due to the large temperature difference between day and night, the temperature rises rapidly during the day, and the transformer oil in the oil discharge pipe expands when heated, which will cause negative pressure in the oil discharge pipe. At the moment when the gas suddenly increases and cannot be discharged, the corrugated surface will not be able to withstand this high temperature. The deform...

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Problems solved by technology

[0003] Due to the large temperature difference between day and night, the temperature rises rapidly during the day, and the transformer oil in the oil discharge pipe expands when heated, which will cause negative pressure in the oil discharge pipe. At the moment when the gas suddenly increases and cannot be discharged, the corrugated surface will not be able to withstand this high temperature. The deformation caused by air pressure will eventually lead to the twisting of the corrugated layer and the connecting part of the layer, so that the corrugated bushing may experience acceleration dragging and poor acceleration, and may cause small-scale damage and bursting of the corrugated surface, which reduces the use of the transformer. life

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