Translated Abstract
The energy production centers and electricity load centers show a reverse distribution in our country. The EHV and UHV power technology need developing to achieve long-distance, large-capacity transport. With the substantial increase of the voltage level of the electrical equipment, 750kV EHV power grid have been built in the west high altitudes. Due to environmental characteristics at high altitudes, network equipment corona noise is relatively prominent. The main harm of the corona is the consumption of electricity, radio interference, making the grid security and reliability.
In this paper, the corona noise and radio interference in 750kV EHV substation have been test, and factors have been analyzed according to the corona threshold voltage. numerical simulation of electromagnetic field has been applied by solving electromagnetic boundary value problems for the distribution of the finite element method to build 750kV and 330kV grid equipment structure optimization model analysis. By comparing the results of numerical simulation of the electromagnetic field, the high-altitude anti-corona noise EHV substation optimization is formed. As for different conductor forms, method of reducing the corona is focused, such as the application of tubular busbar and the 2 - bundle conductor lead to 4 - bundle conductor. As for angular clamp device, the corona is serious. Anti-corona-type fittings have been developed, such as fittings equipment is enclosed in a pressure equalization within the scope of the shield ring protection. As for the original anti-corona design, methods have been applied, such as increasing the diameter of the shielding ring, optimizing the shielding ring number and form. In addition, improvements in the manufacturing and construction process equipment have also been proposed to form a complete anti-faint noise reduction program.
The methods in the field of corona noise and radio interference have been used in the 750kV Riyueshan High Altitude EHV substation. The practical application shows that the surface electrical field of the optimized annihilation device controlled below 30 kV/cm and the noise is below 55dB. Anti-corona noise substation and various technical indicators have been better than national standards.
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