Due to the proximity of the VSC-HVDC converter station to residential areas, if the equipments of the converter station are improperly arranged, it will have a great noise impact on the surrounding residents. Therefore, in order to comprehensively consider the heat dissipation and noise impact of the bridge arm reactor, the bridge arm reactor can be arranged semi indoors. Under the semi indoor arrangement, there are multiple steel structure walls around the bridge arm reactor, and the bridge arm reactor will produce strong alternating magnetic field during operation. If it is not arranged properly, it will have eddy current overheating impact on the steel beam structural parts of the surrounding wall. In this paper, the typical steel beam structure nearest to the bridge arm reactor is selected, and the three-dimensional finite element magnetothermal field simulation calculation model is established. The temperature field calculation of steel beam structure under four working conditions: rated working condition, 50Hz temperature rise current working condition, 100Hz AC load current working condition and 1.2 times rated working condition is carried out. The calculation results show that the temperature rise of the hottest spot of steel beam structure is 1.67k, and the temperature rise can be ignored. At the same time, the  test scheme of bridge arm reactor and surrounding steel structures based on field layout simulation is formulated, and the temperature rise test under 50Hz temperature rise current condition and 100Hz AC load current condition is carried out. The hot spot temperature rise result does not exceed 1.5K. By design, it shows that the influence of dry-type air core bridge arm reactor with semi indoor layout on the heating of surrounding steel beam structures can be ignored. After the bridge arm reactor is actually arranged in the VSC-HVDC converter station, the on-site full power system operation test is carried out. The hottest spot temperature of the surrounding steel beam structure is 33.6℃, and the hot spot temperature rise is 7.6K, which does not exceed the limit requirements of equipment specification and industrial standard. The above simulation and experimental research show that the dry-type air core bridge arm reactor with semi indoor layout has little effect on the heating of the surrounding steel beam structures, which provides a technical reference for the safe and reliable operation of the bridge arm reactor.
 

bridge arm reactor, semi indoor layout, steel beam structural parts, temperature field, temperature rise