Online oil filtering device with intelligent frequency conversion function for main transformer load switch and method

Abstract

The invention relates to an online oil filtering device with an intelligent frequency conversion function for a main transformer load switch and a method. The device comprises an oil pump driven by using a variable-frequency motor, and a particle density detector for detecting transformer oil in an oil storage bucket, wherein the oil inlet of the oil pump is connected with an oil inlet pipe which goes deep into the oil storage bucket; the oil inlet pipe is provided with an oil inlet valve; the oil outlet of the oil pump is connected with an oil outlet pipe leading to the oil storage bucket; the oil outlet pipe is provided with an oil outlet valve, a filtering tank and an electric contact pressure gauge; the electric contact pressure gauge is connected to the variable-frequency motor and a pressure alarm; a frequency converter of the variable-frequency motor and the particle density detector are electrically connected to a control module. By adopting the online oil filtering device, the rotating speed and running time of the oil pump of the load switch online oil filtering device can be lowered and shortened greatly, the working efficiency is increased, and the maintenance workload is lowered. In particular, the times of power failures caused by overhauling of failure of the load switch online oil filtering device in the main transformer can be reduced greatly.

Description

technical field [0001] The invention relates to the field of on-line oil filtering control of an on-load switch, in particular to an on-line oil filtering device and method for an on-load switch of a main transformer with an intelligent frequency conversion function. Background technique [0002] During the operation of the main transformer, when the load changes to a certain range, it is necessary to use the on-load switch to switch the secondary winding taps of the main transformer without power failure to adapt to the change of the load. The on-load switch contact is installed in an oil storage tank with oil inlet and outlet pipes and filled with transformer oil. When the switch is live, the high-temperature arc caused by the on-load switch contact will rapidly heat the transformer oil around the contact and cause it to decompose. Free carbon particles, these solid particles are suspended in the oil, if not removed in time, it may lead to serious accidents such as burning...

AI Technical Summary

Problems solved by technology

The on-load switch contact is installed in an oil storage tank with oil inlet and outlet pipes and filled with transformer oil. When the switch is live, the high-temperature arc caused by the on-load switch contact will rapidly heat the transformer oil around the contact and cause it to decompose. Free carbon particles, these solid particles are suspended in the oil, if not removed in time, it may cause serious accidents such as on-load switch burning and main transformer tripping

The traditional on-line oil filter device with on-load switch cannot automatically control the operation according to the presence of free carbon or other impurity particles in the oil. The motor is easily damaged, and the oil pump runs at high speed for a long time. Even if a small leakage occurs in the oil flow system, air bubbles may be generated, which may cause serious consequences such as tripping of the main transformer due to the heavy tile action of the on-load switch gas relay.

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