When the grounding is good, a low-resistance channel is formed, and a lightning current is discharged, both the conventional arrester and the “equipotential†arrester will satisfy the need for discharge first, and a channel for the lightning current to leak into the ground first is advocated. In this way, overvoltage and overcurrent will not flow into the device as much as possible. Make the device protected.
However, when the equipment system is not equipped with a grounding condition, that is, when there is no ground discharge, the conventional arrester will not work after the grounding path is obstructed, and only the lightning current flowing in the equipment will be damaged and the equipment will be damaged.
The design of the "equipotential" arrester has a distinctive mindset. Firstly, a mechanism for limiting the pressure and current limiting is set up on each path leading to the equipment, and the system is clamped on the arrester's various paths to form a horizontal and vertical all-round “isopotential†state, and excessive lightning current inflow is blocked. equipment. At the same time, it can provide a low-resistance channel to the grounding grid, so that when the grounding is good, it is given priority to discharge through the grid to reduce the impact of lightning current on the equipment and on the relevant lines. If there is no ground discharge or the ground net is changed to a straight high-impedance state and cannot be discharged, we will make other relatively low-resistance or low-voltage lines or metal bodies connected to the lightning arrester bypass circuit and the arrester. The location, that is to force the lightning current to pass through the path allowed by the arrester to the low impedance, low voltage port circuit, or part of the metal object with “equipotential†connection to form a lightning current path, allowing the lightning current to flow outside the device. In places or locations, they may leak part of a grounded network that is well grounded when they are routed elsewhere, or they may be consumed as heat when other metal bodies and resistors pass through.
Vesconite Sheet Rod Bushing (Standard Vesconite - Black) is a specialized thermoplastic made from internally lubricated polymers. Proved since the 1960's as an exceptional bearing material in demanding conditions, Vesconite gives low wear even in dirty or unlubricated conditions. Up to 10 times the life of bronze in dirty conditions. Vesconite has high dimensional stability and does not swell in water, in contrast to most synthetic materials which swell in water. For example, nylon swells up to 3% in water and softens.
Vesconite Tube Rod are produced in Standard 1 meter lengths (39.37 inch = 3.28 feet)
Vesconite Sheet Rod Bushing is available in Hollow bar (Bushing), Solid bar (Rod) and Plate (Sheet) form. It is easily machined and we also provide a fully finished machined bush/component service.
Vesconite Rod Sheet Features :
High Load Bearing Strength - VESCONITE has very low creep rates under design loadings of 4,351 psi (30 Mpa). Much higher load capacity than nylon and elastomers.
Dimensional Stability - The thermal expansion factor of VESCONITE is only 2.5 times that of bronze, lower than many of the competitors. HDPE and nylon is 5 and 10 times greater, respectfully.
No Water Swell - Only 0.5% at ambient. Negligible in sizing calculations. Most of the competition is way above this. Nylon has a 9-10% water swell. Elastomers have a 1.3 - 3% water swell. Phenolics are at generally at 1.6 - 2% water swell. Water swell is one of the primary causes leading to shaft seizure.
Low Friction - Dynamically, about half that of bronze and nylon. This allows for greater combinations of loads and speeds. Greasing of VESCONITE further deceases friction, allowing higher speeds and improved performance. Water is also an excellent lubricant for VESCONITE bushings.
Abrasion Resistance - VESCONITE provides outstanding abrasion resistance resulting in many times longer service life, when compared to bronze. It is also outperforms other products in poor lubrication and dirty conditions.
Longer Life of the Mating Surfaces - The wear of metal pins and shafts is reduced by up to 90% when VESCONITE bushings are used. This fact, alone, justifies the use of VESCONITE ΓÇô less maintenance.
Chemical Resistance Vesconite is highly resistant to diluted acids, organic solvents, oils, and petrol. It has limited resistance to strong acids and strong alkalis.
Temperature Resistance -Vesconite can withstand continuous temperatures up to 212°F (100°C) dry and 176°F (80°C) wet, with momentary peaks above this. Above 158°F (70°C) an expansion gap must be incorporated into the bearing design for a proper use.
Industries we supply Vesconite to:
- Marine
- Mining
- Railways
- Agriculture
- Earth Moving
- Heavy Transport
- Food & Beverage
- Materials Handling
- Bottling & Processing
- Steel, Paper & Textiles
- Hydraulics & Pneumatics
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Hony Engineering Plastics Co.,Ltd. , https://www.honyplastic.com