A New 3D Method for Reactor Core Vibration Based on Silicon Steel Lamination Rules and Application in UHV Shunt Reactors

Abstract

A new three-dimensional (3D) analysis method is proposed as the existing two-dimensional (2D) method has low accuracy in analysing the vibration characteristics of oil-immersed shunt reactors, such as ultrahigh-voltage (UHV) shunt reactors. First of all, a set of 3D laminated coordinate systems was defined based on silicon steel lamination rules, in which the anisotropy of magnetic properties for laminated silicon steel in the rolling direction (RD), the transverse direction (TD), and the lamination direction (LD) were considered. Then, the mapping between laminated coordinate systems and space rectangular coordinate system was established to unify the parameters in different laminated coordinate systems. With the mapping, the anisotropy of the magnetic properties in the laminated coordinate systems was transformed into a rectangular coordinate system. Next, two sets of comparative studies between the new 3D method and the traditional 2D method were carried out, which show that the 3D method has high precision and a wide application range. Finally, the relationship between air gap number and core vibration of UHV shunt reactors was studied by the new 3D method. The results show that, as the number of air gaps increases, the magnetic flux density and the total force area of Maxwell force are increased, resulting in the intensification of core vibration. The conclusions of this paper are helpful for the design of large oil-immersed reactors.

Effect of the temperature increase in oil-immersed electric reactor on the stress loss of the fastening rods of core limb

“…According to the temperature values provided in references [6] and [7], the maximum temperature near the windings may be 90 ℃-105 ℃. Therefore, four loading cases are determined: (1) The rod is heated to 90 ℃ and the disc spring is heated to 50 ℃; (2) Temperature of the rod is increased from 90 ℃ to 105 ℃, and the disc spring is maintained at 50 ℃; (3) After the test device is cooled to room temperature, only the rod is heated to 90 ℃; (4) The temperature of the rod is increased from 90 ℃ to 105 ℃, and all other parts of the test device are still at room temperature.…”

“…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.…”

A vibration monitoring signal processing method for shunt reactor

“…With the rapid development of power system and the increasement of power load, the performance and reliability requirements of power equipment are getting higher and higher. As a common reactive power compensation device in power system, shunt reactor plays an important role in improving the stability of power system and reducing power loss [1][2]. However, due to the long-term operation of shunt reactor and the influence of environmental factors, it may fail or operate abnormally, which brings potential risks to the safe operation of the power system [3][4].…”

Operating State Evaluation Method of UHV Oil Immersed Shunt Reactors

“…The oil-immersed shunt reactor is one of the most important reactive power compensation equipment in the UHV long-distance transmission and transformation system, which can solve the problem of large power and long-distance transmission that makes the capacitance effect of transmission lines obvious. Therefore, the safe and stable operation of the oil-immersed shunt reactor is directly related to whether the UHV power grid can transmit electric energy with high reliability [4][5][6][7] .…”