Power oil discharge and nitrogen injection device of extra-high voltage converter transformer, control system and control method

Abstract

The invention discloses a power oil discharge and nitrogen injection device of an extra-high voltage converter transformer, a control system and a control method and belongs to the field of the poweroil discharge of extra-high voltage converter transformers. A body oil tank oil discharge device comprises an oil pump; the oil pump is connected with a body oil tank through a pipeline; the first port of a body tee joint is connected with the bottom of an oil conservator through a pipeline; the second port of the body tee joint is connected with an oil conservator oil discharge device through a pipeline; the third port of the body tee joint is provided with a stop valve; the output port of the stop valve is connected with the body oil tank through a pipeline; the body oil tank oil discharge device is connected to the bottom of the body oil tank through a pipeline; and the output ends of the body oil tank oil discharge device and the oil conservator oil discharge device are connected withan accident oil pool through pipelines; a plurality of inflation inlets are formed in the upper middle portions of the two sides of the body oil tank and connected with a plurality of nitrogen injection devices; the oil pump is started to discharge oil, the speed is greatly increased, nitrogen is injected into the body oil tank through the nitrogen injection devices while power oil discharging isconducted, and the situation that air enters the emptied converter transformer body oil tank, and consequently makes fire spread in the converter transformer body oil tank is avoided.

Description

technical field [0001] The invention belongs to the technical field of UHV converter oil discharge technology, and in particular relates to an UHV converter converter power oil discharge nitrogen injection device, a control system and a method. Background technique [0002] UHV refers to the voltage level of AC 1000 kV and above and DC plus or minus 800 kV and above. The main characteristics of UHV transmission are high voltage, large transmission capacity, and narrow line corridors, which are suitable for high-power and long-distance power transmission. [0003] The converter station is a system for mutual energy conversion between DC and AC in UHV transmission projects. In addition to the same equipment as the AC substation, such as the AC field, the converter station also has the following equipment: converters, converter transformers, AC and DC Filters and reactive power compensation equipment, smoothing reactors, etc. [0004] The converter transformer is a crucial key...

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Problems solved by technology

[0020] The technical problem to be solved by the present invention is how to solve the problem of too long oil discharge time caused by the natural oil discharge mode of both the oil conservator and the main body oil tank relying on gravity, and prevent the air outside the main body oil tank of the converter transformer from flowing from the transformer The gap enters the oil tank of the converter body

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