Wortai High-voltage composite hollow insulators are insulating components widely used in high-voltage power transmission and transformation systems. The following is a detailed introduction:
Structural Composition
They are mainly composed of an insulating core rod inner cylinder, end flanges, and a silicone rubber shed cover. The silicone rubber shed cover is formed by connecting multiple shed cover sections, and a stepped lap joint structure is adopted between adjacent shed cover sections, which can enhance the connection strength, ensure electrical performance, and extend the service life.
Technical Parameters
• Rated Voltage: Common ones include 110 kV, 220 kV, 500 kV, 1000 kV, etc. Different voltage levels are applicable to different power transmission lines and electrical equipment.
• Mechanical Load: It includes tensile load, bending load, torsional load, etc., and is usually expressed in kN, such as 70 kN, 100 kN, etc., to ensure that conductors and electrical equipment can be reliably supported under different working conditions.
• Creepage Distance: Generally in units of mm. For example, the creepage distance of the 10 kV level may be about 200 mm, and that of the 110 kV level is more than 2000 mm. The specific value depends on the voltage level and the application environment.
• Lightning Impulse Withstand Voltage: For example, for high-voltage composite hollow insulators of 110 kV, the lightning impulse withstand voltage is generally about 550 kV, and that of 220 kV is about 1050 kV.
• Switching Impulse Withstand Voltage: The switching impulse withstand voltage of 110 kV is usually about 450 kV, and that of 220 kV is about 850 kV.
Production Standards
Internationally commonly used standards include IEC 61462, IEC 61109, etc. Domestic standards include GB/T 22707, GB/T 22079, etc. These standards clearly stipulate the materials, performance, test methods and other aspects of high-voltage composite hollow insulators.
Application Scenarios
• SF6 Gas-Insulated Switchgear (GIS): As the inlet and outlet bushings of GIS equipment, it can provide reliable insulation and support within a limited space to ensure the safe operation of GIS equipment.
• Oil-Immersed and SF6 Instrument Transformers: They are used for the high-voltage side outgoing lines of instrument transformers to prevent current leakage and discharge to the ground and ensure the normal measurement and protection functions of instrument transformers.
• Circuit Breakers: Installed at the inlet and outlet ends of circuit breakers, they can withstand the high voltage and large current impacts when the circuit is opened and closed to ensure the insulation performance and mechanical stability of circuit breakers.
• Transformer Inlet and Outlet Bushings: They connect the windings of transformers with external power transmission lines, play the role of insulation and support, and at the same time bear the high voltage and large current when the transformers are in operation.
Advantages
Compared with traditional porcelain or glass insulators, they have the advantages of being explosion-proof and resistant to damage, having good seismic resistance, being small in size and light in weight, having good pollution resistance, having strong anti-aging properties, and being maintenance-free.
Wortai 1 - 1100kV Hollow Composite Insulators possess numerous outstanding features, especially its silicone rubber housing:
In terms of performance, it has excellent anti-pollution capabilities. Even in heavily polluted environments, it can still ensure stable insulation effectiveness. It has strong seismic resistance. When an earthquake occurs or it is subjected to strong vibration interference, it can effectively maintain its structural integrity and ensure the safety of power transmission. It has a relatively high mechanical strength and can withstand external forces under various complex working conditions. Moreover, it is lightweight, which facilitates transportation and installation and can significantly reduce construction difficulties and costs. Particularly noteworthy is that it also has explosion-proof characteristics, which greatly enhance its safety in use. Coupled with its nearly maintenance-free nature, it can effectively reduce the energy and cost of later operation and maintenance.
Based on the above advantages, this type of insulator is widely used in many special scenarios: in heavily industrial polluted areas with high pollution levels, or in remote areas where transportation is inconvenient and it is difficult for maintenance materials and manpower to arrive quickly, as well as in high-risk areas where earthquakes occur frequently. It can play a significant role and safeguard the stable and reliable operation of the power system.
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