Composite insulator structure composite insulator
is also known as or porcelain insulator, composite insulator, rubber insulator material it is made of organic synthesis of composite insulator, mainly have a core rod, hardware, umbrella skirt of sheath and adhesive layer.
Hardware is the transmission of composite insulator pin type mechanical load components, it and core rod assembly together constitute the fittings of composite insulator.
The stand or fall of structure affect the core strength of the play and the mechanical properties of the insulator.
Umbrella skirt is sheathed composite external insulation pin insulator, its role is to make high voltage insulator has a high enough resistance to wet flash external insulation performance and the pollution flashover, protect the mandrel from atmospheric corrosion.
Composite insulator mandrel is mechanical load bearing parts, but it is also a major part of the internal insulation.
Part of adhesive layer is to use glue to complete the connection between sheath and core rod;
Another part of the potting glue is used to complete the connection between the umbrella skirt.
Within the bonding quality is directly related to the level of insulation.
Pin insulator electrical properties along the surface of insulation of destructive discharge called flashover, pin insulator flashover characteristics is the main electrical performance.
For different voltage grade, pin insulator the withstand voltage requirements vary, the indicators are dry, wet power frequency withstand voltage, thunder lightning impact bearability, shock wave pressure, impact operating pressure, etc.
To avoid a breakdown in the operation, the breakdown voltage is higher than the flashover voltage of insulator.
In factory test, generally through the spark test can be breakdown of porcelain insulator, the sparks of high-voltage insulating surface occurs frequently, to maintain a certain period of time, look to whether be breakdown.
Also need some insulator corona test, radio interference test, partial discharge test and dielectric loss test, etc.
High altitude insulator, make electric intensity drops by air density decreased, therefore, the withstand voltage conversion to standard atmospheric conditions should be increased accordingly.
Polluted insulator flashover voltage of be affected with damp be affected with damp is much lower than dry, wet flashover voltage, therefore, impurity region must be reinforced insulation or USES the fouling resistance type insulator, the creepage distance (
Creepage distance and the ratio of the rated voltage)
Should be higher than normal type.
Dc pin insulator compared with ac insulator, the electric field distribution is poorer, and the adsorption fouling and electrolysis, flashover voltage is low, have a special structure design and general requirements more creepage distance.
Mechanical properties (2 pin insulator, composite insulator in run by gravity, wind, ice and tension of the wire weight, weight of insulator and conductor vibration, equipment operation mechanical force, short-circuit electrodynamic force, the action of earthquake and other mechanical force.
Relevant standards have strict requirements on mechanical properties of regulations.
(3) pin insulator thermal performance: outdoor insulator requirements has the ability to tolerate temperature leaps.
Such as porcelain insulator requirements without cracking a few times of psychro-thermal cycles.
Insulation casing because of an electric current passes through, its components and the temperature rise of insulated parts and allow the short-time current value must comply with the provisions of the relevant standards'
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