High-lightning-resistance horizontal insulated cross arm used for power distribution network of 10 kV
A technology with insulating cross-arm and lightning-resistant level, which is applied in the field of power grid construction, can solve the problems of being unable to stand on people, low mechanical strength, and low mechanical strength of shed sheds, and achieve the effect of solving lightning strike disconnection and improving safety
Pending Publication Date: 2019-03-19
STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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Problems solved by technology
But these two kinds of insulating cross-arms have shortcomings. The silicone rubber insulating cross-arm has the disadvantages of low mechanical strength of the shed, unable to stand on people, and is easy to be infested by insects and birds; the ceramic insulating cross-arm has the disadvantages of low mechanical strength, easy damage or fracture.
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[0019] The specific implementation of a high-level lightning-resistant insulating cross-arm used in a 10kV distribution network of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0020] The 10kV distribution network insulation cross arm of the present invention includes an inner core, mandrel, shed, surface coating and metal connectors, such as figure 1 shown. The inner core is made of polyurethane foam material, and the inside of the mandrel is filled with foam, which not only prevents internal water seepage, improves the internal insulation level, but does not increase the overall quality of the cross-arm; the traditional manual foaming process is adopted.
[0021] The mandrel is the main load-bearing part of the entire cross arm, so it has high requirements on the mechanical properties of the material. Bisphenol A epoxy with high strength is used as the resin matrix, and E glass fiber is used as the reinforcing mater...
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The invention provides a high-lightning-resistance horizontal insulated cross arm used for a power distribution network of 10 kV. The high-lightning-resistance horizontal insulated cross arm comprisesan inner core, a core rod, an umbrella skirt, a surface coating and a metal connecting part; the inner core is made from polyurethane foaming materials, and the core rod is filled with foams; bisphenol A epoxy with high strength is adopted as a resin matrix of the core rod, and E glass fibers are used as reinforcing materials; the umbrella skirt is made from HCEP series resin of the HUTSMAN company, and an automatic pressure gelatin (APG) forming technology is adopted; a fluorocarbon coating is adopted for the surface coating; lightning impulse withstand voltage is larger than or equal to 350kV, and creep distance below 1,000 m altitude is larger than or equal to 750 mm. A more reasonable insulating material is selected for the high-lightning-resistance horizontal insulated cross arm, itis tried to improve the insulated cross arm to be of an umbrella skirt structure having certain strength and a good function, and therefore the safety of lines is improved; in addition, the high-lightning-resistance horizontal insulated cross arm effectively solves the problems that the power distribution network trips under lightning, and insulating wires are broken under lightning through insulation coordination altitude correction.
Description
technical field [0001] The invention belongs to the technical field of power grid construction, and in particular relates to a high lightning-resistant horizontal insulating cross arm for a 10kV power distribution network. Background technique [0002] The cross arm is a common fitting in the power distribution network. It is mainly used to support the insulators, conductors and power distribution equipment on the column to ensure a sufficient safety distance between the conductors. In recent years, with the rapid development of live-line work in distribution networks and the continuous improvement of technical levels, there are more and more live-line projects that operators can carry out. Many of these projects include the step of live-line installation or replacement of cross-arms. At present, the cross-arms used in distribution networks in many areas are mainly iron cross-arms. In actual operation, operators mainly rely on arm strength to support the cross-arms, and fact...
Claims
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IPC IPC(8): E04H12/24E04H12/02
CPCE04H12/02E04H12/24
Inventor 王栋季润阳毛艳芳瞿佥炜张迈
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH