Research on Erosion of Main Contact of Vacuum On-Load Tap Changer
The vacuum on-load tap changer(OLTC)is a key component of the converter transformer in DC transmission projects,which compensates for AC voltage fluctuations on the grid side of the converter transformer and achieves DC voltage reduction operation mode.The OLTC main contact requires frequent operation during operation,and the surface of the main contact is eroded due to mechanical and electrical stress during long-term operation.Therefore,this paper analyzes the physical properties of the main contact material,the dynamic model of arc magnetohydrodynamics(MHD)in contact gap,and the mathematical model of contact resistance,providing useful references for the operation and electrical ablation mechanism analysis of vacuum OLTC main contacts.
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