Composite insulator metal accessories metal accessories is composite insulator
at both ends of the connecting parts.
Composite insulator metal accessories generally use galvanized steel and must have the appropriate extensibility to connected to the mandrel.
Technical requirements, test methods and inspection rules must comply with JB/T 8178 and the relevant provisions of the JB/T 9677.
In addition to the stainless steel of all iron metal accessories should be carried out in accordance with the JB/T 8177 hot dip galvanized.
Composite insulator metal accessories all the surface should be smooth, no sharp corners, burrs or irregularity case caused by corona.
Such as forging shall be no cracks, thin layer, scar, wrinkled skin, silver, etc.
Before the end fittings galvanized, all burrs are carefully removed, and the components of conform to the requirements of the standard size.
Under the condition of normal operation, metal accessories visible corona voltage should be within the permissible value, the radio interference level should satisfy the special part of the requirements of the technical parameter table.
Metal attachment size should comply with the provisions of GB/T 4056.
4 lock pin ball and socket connection of composite insulator should be equipped with R type locking pin.
Locking pin should be able to maintain in the position of locking and loosening, and should be the end of the two separate to prevent it from inside the steel cap out completely.
Locking pin should accord with the requirement of JB/T 8181.
Locking pin should be made of austenitic stainless steel should not adopt a anti-corrosion surface and itself is not corrosion resistant materials, and supply of complete sets of composite insulator.
In separate the locking pin at the end of the 180 & deg;
And then back to its original position with the naked eye examination should not appear crack.
Locking pin assembly should use special tools, so as not to damage the zinc coating of metal accessories.
5 of composite insulator equalizing device must be installed on both ends of the composite insulator equalizing device, the equalizing device materials should be used aluminium alloy, and has enough mechanical strength.
Diameter of pressure ring, ring diameter and shielding depth should meet the tenderee requirements, whether to adopt the sound proof type chosen by the buyer (
See the special technical part)
6 assembly of more than 66 kv voltage grade insulator, the metal attachment connection with mandrel pressure welding process must be used.
Composite insulator metal accessories and sheath should be * * sealed, its permeability test should comply with the GB/T 19519 & ndash;
Article 4 and 7.
The provisions of article 4.
Metal accessories shall ensure that the design ideal of stress distribution, pressure welding process must be detected by acoustic emission method with other effective means of quality control tests, put an end to end connection overvoltage and undervoltage problems.
Pressure after processing of galvanized layer metal accessories in accordance with the JB/T 8177, and pressure welding parts (
Including pressure and border areas)
The galvanized layer can not have defects such as peeling, delamination, crack or zinc.
Such as pressure or move hardware, mandrel outsourcing materials, performance, size, appearance and processing technology should be strictly management and into the factory inspection.
When outsourcing is not the same, must be test and destruction test (
Including pressure welding parts autopsy)
New * better suppress procedures and control parameters, and the final validation report (
Autopsy color photo attached)
Insulator metal accessories meet original record pressure welding operation, and convenient for quality tracking.
Long-term preservation of original records should be documented.
7 nameplate nameplate must be maintained for each a composite insulator to mark manufacturer name or trademark, manufacturing date, rated voltage, rated mechanical load and the product serial number.
Nameplate should adopt anaglyph moulded or in order to more good manufacturing process.
8 certificate each composite insulator should be hung with certificate, certificate of approval on should include the manufacturer name, product number, inspection date and inspector.
9 composite insulator composite insulator should be suitable for operation maintenance of charged maintenance technology, in order to make the general charged operation can be convenient, fast and safely.
In this paper, information from: http://www.
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