Converter transformer oil paper insulation trap charge density measuring and calculating method
A technology for converter transformers and oil-paper insulation, which is applied to instruments, calculations, and measuring devices. It can solve the problems of harsh experimental conditions, difficulty in application, and inability to quantitatively calculate the internal trap charge density of oil-paper insulation. The effect of strong interference ability and convenient experimental conditions
Active Publication Date: 2020-12-11
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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Problems solved by technology
[0006] In order to overcome the shortcomings of the existing technology: the present invention provides a method for calculating the trap charge density of the oil-paper insulation of the converter transformer, which is used to solve the problem that the existing technology cannot quantitatively calculate the trap charge density inside the oil-paper insulation and the experimental conditions are relatively harsh, which is difficult to implement on site Applied Technical Issues
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[0036] Below in conjunction with accompanying drawing, specific embodiment of the present invention is described in detail
[0037] attached by Figure 1~4 Shown: a method for calculating the charge density of oil-paper insulation traps in converter transformers, including the following steps, and the following steps are carried out in sequence,
[0038] Step 1. At a constant temperature, use the frequency domain dielectric response tester 1 to test the dielectric loss factor data of the oil-paper insulation structure 3, and obtain the real part ε' and imaginary part ε" of the dielectric constant of the product to be tested at different frequencies. Data, the temperature is the oil temperature of the oil-immersion environment where the oil-paper insulation structure 3 is located; the frequency is the angular frequency of the alternating voltage;
[0039] Step 2. Considering the conductance loss of the oil-paper insulation during the frequency domain dielectric response test, ...
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The invention discloses a converter transformer oil paper insulation trap charge density measuring and calculating method, and belongs to the technical field of converter transformer oil paper insulation aging state evaluation. The method comprises the steps: testing dielectric loss factor data of the oil paper insulation structure through a frequency domain dielectric response tester, and correcting the Coole-Cole model; obtaining an expression of a dielectric constant related to the free charge conductivity, obtaining a characterization equation of the free charge conductivity, obtaining thefree charge density in unit time under different frequencies, obtaining a difference value of the free charge density between the highest frequency and the lowest frequency, and testing the oil paperinsulation trap charge density. The effects of quantitatively calculating the trap charge density in the oil paper insulation in the converter transformer so as to effectively evaluate the aging state of the oil paper insulation in the transformer and facilitating field implementation through nondestructive testing are achieved.
Description
technical field [0001] The invention belongs to the technical field of evaluating the aging state of oil-paper insulation in the operation and maintenance technology of converter transformers, and in particular relates to a method for measuring and calculating the charge density of oil-paper insulation traps in converter transformers. Background technique [0002] The converter transformer is the core key equipment of the UHV DC converter station, and its safe and stable operation is an important guarantee for the reliability of the power grid. Compared with the traditional oil-paper insulated AC transformer, the oil-paper insulation on the valve side of the converter transformer is not only subjected to thermal stress for a long time to cause insulation degradation, but also suffers from complex electric fields such as AC and DC superposition and polarity reversal, which is easy to accumulate space charges and withstand higher Much DC field strength component. Due to the d...
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IPC IPC(8): G06F30/20G01N27/22G06F119/04
CPCG06F30/20G01N27/221G06F2119/04
Inventor 谷裕徐攀腾朱博李冬冬李建勋陈弘基顾硕铭胡覃毅
Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION