Method for detecting transformer direct-current magnetic bias capacity

Abstract

The invention discloses a method for detecting the transformer direct-current magnetic bias capacity. The method for detecting the transformer direct-current magnetic bias capacity includes the steps of setting up a transformer direct-current magnetic bias simulation model, changing the numerical value of a direct current which is injected into a transformer neutral point under the condition that a transformer is set to be under a rated load, changing load parameters of the transformer in the simulation model, changing bus voltage value parameters to calculate a total harmonic distortion rate, and determining the largest neutral point direct-current magnetic bias current borne by the transformer. The method for detecting the transformer direct-current magnetic bias capacity has the advantages that when the transformer neutral point direct-current bias current bearing magnetic bias capacity is analyzed under different load conditions and different voltage regulator tapping conditions by setting up the simulation model and using a harmonic wave as a representation magnitude of the transformer direct-current bias bearing magnetic bias capacity, the method better conforms to the actual running condition compared with an existing method and has guiding significance in practical engineering.

Description

technical field [0001] The invention relates to a method for detecting the DC bias capability of a transformer. Background technique [0002] As an important equipment in the power system, the transformer's stable operation is directly related to the stability of the entire system. With the formation of the coexistence situation of AC and DC transmission in Shandong Power Grid, it is of great theoretical significance and engineering significance to study the operating characteristics of the transformer under the condition of DC bias, analyze its ability to withstand DC bias, and then provide effective DC bias suppression measures. value. [0003] The characterization quantities of DC bias effects include harmonics, vibration, noise and neutral point current. The influence of transformer vibration, noise and neutral point current on the transformer itself can only be seen through accumulation; the harmonic content of the transformer busbar can be accurately calculated throu...

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Problems solved by technology

[0004] The article "Analysis of DC Bias Capability of Transformer Under Power Quality Constraints" puts forward the criterion for determining the maximum DC bias current that a transformer can withstand based on the voltage adjustment rate and voltage total harmonic distortion rate, but the total harmonic distortion rate of the transformer is calculated The method of this patent is different from that of this patent, and the ability of the transformer to withstand the DC bias magnetic field obtained by it is low, which is inconsistent with the actual operation data.

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