Abstract
The noise and vibration of large oil-immersed reactor is usually controlled and reduced by using high-strength pretensioned steel rods to fasten iron cores. But the effect of uneven temperature increase in the reactor on the pretension relaxation of steel rods is rarely discussed in previous literatures. A combined fastening device of high-strength steel rod and disc spring is designed to conduct temperature experiment in this paper. And three-dimensional (3D) finite element model is developed to reproduce the experiment process. After the numerical simulation method is verified, finite element analysis of a real BKD-6700/20 oil-immersed reactor is performed. The prestress loss proportion of the high-strength pretensioned steel rods in the oil-immersed reactor under practical operating state is 17.91 % owing to its uneven temperature rise, which can result in significantly weakening of its vibration and noise reduction function.
Highlights
A shunt reactor, which compensates for long-distance line capacitance and suppressing the increase of power frequency, is one of the important items of equipment in AC transmission projects [1]
Oil-immersed reactor is mainly composed of core limb, windings, iron yokes, oil-tank, cooling device and protection device
Based on the temperature increase experiment of combined high-strength prestressed rod and disc spring model and the numerical simulation results of the BKD-6700/20 oil-immersed reactor, the stress loss of high-strength pretensioned rods is checked in term of practical operating state of the reactor
Summary
A shunt reactor, which compensates for long-distance line capacitance and suppressing the increase of power frequency, is one of the important items of equipment in AC transmission projects [1]. The core limb includes core discs and air gaps (marble or ceramics) It is fixed between the upper and lower iron yokes with high-strength pretensioned steel rods running through all the laminated core discs, air gaps. Local temperatures near windings and core discs arise, leading to the expansion and stress relaxation of the high-strength pretensioned rods. EFFECT OF THE TEMPERATURE INCREASE IN OIL-IMMERSED ELECTRIC REACTOR ON THE STRESS LOSS OF THE FASTENING RODS OF CORE LIMB. Based on the temperature increase experiment of combined high-strength prestressed rod and disc spring model and the numerical simulation results of the BKD-6700/20 oil-immersed reactor, the stress loss of high-strength pretensioned rods is checked in term of practical operating state of the reactor
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