Life monitoring and fault diagnosis method for oil immersed power transformer
A technology for fault diagnosis of power transformers, applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve problems such as inability to accurately evaluate transformer life, overall status, and failure rate
Inactive Publication Date: 2019-01-11
广州致新电力科技有限公司 +2
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Problems solved by technology
These monitoring methods can only provide protection or alarm after a problem occurs in the oil transformer, and at the same time cannot accurately evaluate the life, overall state and failure rate of the transformer
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[0063] The invention is mainly applied to oil-immersed power transformers of 110kV and above.
[0064] The main protection objects of the present invention are the life monitoring and fault diagnosis device for the oil-immersed power transformer realized by the method, and the algorithm, sensor integration and realization form adopted in the device.
[0065] see Figure 1 to Figure 3 , the oil-immersed power transformer life monitoring and fault diagnosis method embodiment of the present invention comprises the following steps:
[0066] 1. Sensor layout and data collection
[0067] Generally, the secondary coil of the transformer is arranged close to the iron core. At the same time, the secondary side of the oil-immersed power transformer has a large load current and serious heat generation, and hot spots are prone to appear here. The higher the temperature of the hot spot, the faster the insulation aging speed of the coil, so the The oil top temperature sensor is arranged n...
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The invention discloses a life monitoring and fault diagnosis method for an oil immersed power transformer. The method comprises following steps: S1, arranging sensors and collecting data; S2, processing data: S2.1 filtering data, S2.2 calculating the aging rate of the oil immersed power transformer: S2.2.1 calculating the secondary side hot spot temperature of the oil immersed power transformer,S2.2.2 calculating the temperature rise delta theta TO of the top oil temperature relative to the ambient temperature, S2.2.3 calculating the aging rate, the life loss equivalent time of the oil immersed power transformer during this time period can be calculated by multiplying the aging time during normal operation by the relative aging rate at the location, and the remaining life of the transformer can be calculated by subtracting the life loss equivalent time from the design life of the oil immersed power transformer; and S2.3 calculating the fault diagnosis of the oil immersed power transformer. According to the life monitoring and fault diagnosis method for an oil immersed power transformer, the remaining life and the state type of the oil immersed power transformer in operation can be evaluated and calculated in real time; previous planned overhaul is changed into condition-based overhaul; the initiative of life monitoring and fault diagnosis of an oil immersed power transformeris improved.
Description
technical field [0001] The invention relates to a method for life monitoring and fault diagnosis of an oil-immersed power transformer. Background technique [0002] Existing oil-immersed power transformer monitoring is mainly passive monitoring, which can obtain little information about the transformer's operating status and its own health, such as DGA oil chromatography monitoring commonly used in oil transformers, heavy gas protection, light gas protection, etc. These monitoring methods can only provide protection or alarm after a problem occurs in the oil transformer, and at the same time cannot accurately evaluate the life, overall state and failure rate of the transformer. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a life monitoring and fault diagnosis method for an oil-immersed power transformer, which can identify the equipment change trend in real time, and at the same time provide the remaining life...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 盛健银星茜彭曼韩燕东廖权保王亚东谭冠岗
Owner 广州致新电力科技有限公司