Method for evaluating sulfur corrosion state of transformer copper coil

A technology of copper coils and transformers, which is applied in the fields of weather resistance/light resistance/corrosion resistance, instruments, scientific instruments, etc., can solve the safety hazards and detection problems of copper coils, achieve fast methods, avoid transformer damage, good economic benefits and safety benefit effect

Inactive Publication Date: 2015-11-25
STATE GRID CORP OF CHINA +2
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  • Claims
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Problems solved by technology

[0003] Aiming at the defect that the copper coil inside the transformer has potential safety hazards and cannot be detected in the prior art, the purpose of the present invention is to pro

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  • Method for evaluating sulfur corrosion state of transformer copper coil

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Embodiment 1

[0038] (1) The sulfur element content in a 110kV transformer oil was detected twice at intervals of 3 years by plasma emission spectroscopy to be 500mg / kg and 400mg / kg;

[0039] (2) The difference between the two detections of sulfur element concentration is 100 mg / kg;

[0040] (3) The oil weight of this transformer is 20 tons, and the mass of cuprous sulfide can be calculated according to the formula to be 10kg;

[0041] (4) The volume of cuprous sulfide is 1.8L, and the total surface area of ​​the coil copper wire obtained from the query data is 264m 2 , the calculated thickness of cuprous sulfide is 6800nm;

[0042] (5) According to the classification of risk level, the transformer is in high risk level A.

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Abstract

The invention discloses a method for evaluating the sulfur corrosion state of a transformer copper coil. The method includes the steps that during the operation period of a transformer, the sulfur concentration in insulating oil is detected twice successively at a certain time interval, so that the change difference value of the sulfur concentration in the insulating oil at the time interval is obtained; the mass of generated cuprous sulfide is obtained through the change difference value of the sulfur concentration according to the substance conservation principle; then the average thickness of the cuprous sulfide deposited on the surface of the copper coil is calculated through combination of the mass of the cuprous sulfide and the known conditions of the density of the cuprous sulfide and the total surface area of the copper coil after the transformer leaves a factory; the sulfur corrosion state of the transformer copper coil can be determined according to the average thickness of the cuprous sulfide. The method is quick and accurate, and the corrosion state of a transformer copper winding subjected to electrified monitoring can be judged effectively. Through risk grade division and effective decision, safety risks caused by corrosive sulfur in the insulating oil of the transformer can be greatly lowered, and therefore good economic benefits and safety benefits are achieved.

Description

technical field [0001] The invention relates to a method for monitoring the sulfur corrosion state of a transformer copper coil, belonging to the technical field of transformer state monitoring. Background technique [0002] Insulating oil is a petroleum refining product containing straight alkanes, naphthenes and aromatics, and is widely used in transformer equipment. Some sulfides contained in insulating oil can cause corrosion of transformer copper windings. A large number of insulating oils in operation have been tested, and the results show that the corrosion of copper sheets by insulating oil is common. Insulating oil containing corrosive sulfur will generate cuprous sulfide on the surface of copper coil after long-term operation, which will reduce the insulation performance of insulating paper, and in severe cases, it will cause breakdown and burning of the transformer insulation layer. Dozens of transformers at home and abroad have burned down due to corrosive sulfu...

Claims

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Application Information

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IPC IPC(8): G01N17/00G06F19/00
Inventor 万涛周舟冯兵何铁祥龚尚昆李臻
Owner STATE GRID CORP OF CHINA
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