Method for simulating fatigue test of inter-pole connection wire

Abstract

The invention discloses a method for simulating a fatigue test of an inter-pole connection wire, wherein a periodic load can be applied to an actual assembly of the inter-pole connection wire by usinga low cycle fatigue tester, and an alternating load generated by the circumferential relative displacement between the two magnetic poles can be simulated when a hydraulic generator is operated in arated running state and a runaway state; meanwhile, the inter-pole connection wire can be heated to simulate the actual temperature rise in the unit operation, so that the startup and shutdown times prediction of the inter-pole connection wire of the hydraulic generator in the rated running or the runaway state are obtained through the number of fatigue cycles of the corresponding inter-pole connection wire under different loads; and the structural optimization of the inter-pole connection wire is guided, so that the data support is provided for the service life prediction of reliable startupand shutdown times of the large hydraulic generator including the pumped-storage unit.

Description

technical field [0001] The invention relates to a method for simulating a fatigue experiment of an interpolar connection line. Background technique [0002] The connecting wire between the poles is the key component of the hydro-generator, and its function is to connect the rotor magnetic pole coils to form the rotor winding. For hydro-generators, especially pumped-storage hydro-generators, they face the problem of periodic startup and shutdown due to the need for peak regulation. The conversion of power generation and water pumping conditions will not only generate a large mechanical load on the structure of the inter-electrode connection, but also the constant temperature rise of the inter-electrode connection will affect its fatigue life. During the start-up and shutdown phase of the unit, the alternating mechanical load caused by the circumferential deformation difference of adjacent magnetic poles may cause fatigue damage to the connecting wire material between poles a...

AI Technical Summary

Problems solved by technology

The conversion of power generation and water pumping conditions will not only generate a large mechanical load on the structure of the inter-electrode connection line, but also the constant temperature rise of the inter-electrode connection line will also affect its fatigue life.

During the start-up and shutdown phase of the unit, the alternating mechanical load caused by the circumferential deformation difference of adjacent magnetic poles may cause fatigue damage to the connecting wire material between poles and affect the safety of the unit operation.

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