In the “West-to-East Electricity Transmission†power transmission project in China, ±1100 kV DC transmission has become the core technology for supporting more distant distances and larger-scale power transmission because of its outstanding advantages such as long transmission distance, large transmission capacity, and low transmission loss. The ±1100 kV DC wall bushing is the only electrical connection device for connecting high-voltage and large-capacity electrical equipment inside and outside the converter station hall. The single unit carries the voltage and current of the whole system and the transmission capacity reaches 6 million kilowatts (comparable The 1/3 of the total electricity load in Beijing can be called the "throat" of the HVDC transmission system. It is characterized by high complexity and high reliability requirements, and it is a technical bottleneck restricting the development of the ±1100 kV HVDC transmission project in China. In the "12th Five-Year Plan" 863 Plan advanced energy technology field, "±1000kV DC SF6 Gas Insulated Wall Bushing Core Technology Research and Device Development" project made significant progress in ±1100 kV DC wall bushings, breaking through the casing A series of key technologies such as materials, design, technology, and tests are domestically pioneered and internationally advanced. The four topics to which the project belongs have passed the technical acceptance in the near future. The project was undertaken by the China Electric Power Research Institute and jointly completed by units such as Xi'an Jiaotong University, Tsinghua University, Pinggao Group Co., Ltd., and Xi'an West Electric High-voltage Bushing Co., Ltd. The project successfully developed the ±1100kV/5523A DC wall bushing with the world's first "epoxy core SF6 gas composite insulation" and "pure SF6 gas insulation" insulation structure, and developed a casing insulating material formula with independent intellectual property rights. The system has overcome the technical problems of bubble-free impregnation of super-sized epoxy cores and thermal stress suppression during the curing process, and established a comprehensive test platform and test technology system for electrical, thermal and mechanical properties of ±1100 kV UHV DC bushings. Internationally, it has taken the lead in completing a full set of ±1100 kV DC wall bushing tests for both structures. The DC wall bushing developed by the project will be put into operation in the world's first ±1100 kV DC transmission project Changji-Guquan UHV DC transmission project. The implementation of this project has broken through the core technology of ±1100 kV DC wall bushing development and successfully developed a ±1100 kV DC wall bushing. The related technology has been back-fed to DC sets of ±800 kV and below voltage classes. The development of the tube enables China to lead the core technology in the history of high-end electrical equipment R&D. It is of great significance to realize the full localization of UHV DC equipment, reduce the project cost, guide the upgrading of China's electrical equipment manufacturing industry, and enhance international competitiveness. Rectangular Magnets are six-sided magnet with straight sides where all angles are right angles (90°). Opposite sides of the magnet are parallel. They are commonly used in holding applications where they fit within a channel to increase their holding force. We carry a selection of different shapes and sizes and can manufacture magnets to our customers' specifications. Rectangular Magnets Rectangular Magnets,Neodymium Rectangular Magnets,N35 Rare Earth Ndfeb Neodymium Rectangular Magnet Jinyu Magnet (Ningbo) Co., Ltd. , https://www.magnetbonwin.com
These Sintered NdFeB magnets are particularly suitable for high volumn production of a wide variety of shape and size ranges. Ni, Zn or customized coated surface protection. Precise dimensional control is achieved in both processed and usually the component does not require futher machining. NdFeb magnets have been widely used in high performance stepper, DC, servo, and linear motors, actuators, loudspeakers, headphones, instrumentation, switches, relays, magnetic imaging for medical and geophysical applications, holding systems, magnetic bearings, magnetic couplings, hard disk drives, etc.
Neodymium Rectangular Magnets are very strong, but very sensitive to temperature and corrosion. To combat temperature we can help you to select the grade that is appropriate for the operating temperature that you may require. To combat corrosion, neodymium magnets are coated on the outside. Most commonly they will be coated with nickel-copper-nickel, but can also be coated with epoxy, gold and parylene.
It is important to know that neodymium magnets are very hard and brittle and can break if they are dropped. Neodymium magnets can be assembled into products that use strong adhesives, but contact surfaces should all be clean and dry before bonding.
Block (or bar) magnets have completely flat surfaces that are perpendicular (at right angles) to each other, and are available in all scales from cubes through to long rectangular prisms.
The dimensions for blocks are Length x Width x Height (mm).
Block magnets feature straight edges and are available in all proportions from cubes through to flat rectangular bars. Rare Earth blocks are available in sizes from approx 6mm length up to 100mm length, with pull strengths exceeding 100kg.