The utility model discloses a protection device for an extra-
high voltage flexible
direct current power transmission system, and solves the problem that in a protection device for a
power transmission system, a
resistor element is easily affected by external force and damaged, or stress is generated in the
resistor element to affect the resistance value, so that the large current deformation resistance and the
high voltage electric field of the
resistor element are not uniform. The device comprises a resistor combination structure and an inter-stack connection pipeline, wherein the resistor combination structure comprises a plurality of resistor boxes; the plurality of resistor boxes comprise a plurality of in-box resistor modules, each in-box resistor module comprises a plurality of resistor units, a plurality of U-shaped
metal resistor bodies are connected in series in each resistor unit to form a continuously bent strip, the through-flow section of the resistor is large, the through-flow capacity of large current is improved, meanwhile, the process of
punching a resistor disc is abandoned, the
utilization rate of a resistor material is improved, and the cost is reduced. The production cost is reduced, the competitiveness of the product is improved, and meanwhile, the insulators are arranged between the resistor units, so that the attraction effect between the resistor units can be prevented.