The use of resin (polymer, polymeric, composite) insulated bushings for high voltage applications is common, although most high-voltage bushings are usually made of resin impregnated paper insulation around the conductor with porcelain or polymer weather sheds, for the outdoor end and occasionally for the indoor end.

Bushing vs bearing

Insulated bushings can be installed either indoor, or outdoor, and the selection of insulation will be determined by the location of the installation and the electrical service duty on the bushing.

The design of any electrical bushing must ensure that the electrical strength of the insulated material is able to withstand the penetrating 'electrical energy' passing through the conductor, via any highly stressed areas. It must also be capable of enduring, occasional and exceptional high voltage moments as well as the normal continual service withstand voltage, as it is the voltage that directs and controls the development of leakage paths and not current.

Bushing definition engineering

Condenser bushings produce electric stress fields which are significantly less potent around the fixing flange than designs without foils and, when used in conjunction with resin impregnation, produce bushings which can be used at service voltages over one million volts with great success.

All materials carrying an electric charge generate an electric field. When an energized conductor is near a material at earth potential, it can form very high field strengths, especially where the field lines are forced to curve sharply around the earthed material. The bushing controls the shape and strength of the field and reduces the electrical stresses in the insulating material.

The inside of the porcelain bushing is often filled with oil to provide additional insulation and bushings of this construction are widely used up to 36 kV where higher partial discharges are permitted.

At the stage of designing a motor, choosing the right bearings is one of the key factors in ensuring its performance and reliability. The selection of electric motor bearings not only affects the operating efficiency of the motor, but is also directly related to the service life and maintenance costs of the motor.

The earliest bushing designs use porcelain for both indoor and outdoor applications. Porcelain was originally used due to its properties of being impervious to moisture once sealed by fired glaze, and low manufacturing cost. The main disadvantage with porcelain is that its small value of linear expansion has to be accommodated by using flexible seals and substantial metal fittings, both of which present manufacturing and operational problems.

Noise and vibration are important factors affecting motor performance and operating experience.The design should fully consider the impact of bearings on motor vibration and operating noise, and targeted optimization. Generally, ball bearings are less noisy than roller bearings.

Since the 1965s, resin materials have been used for all types of bushing up to the highest voltages. The flexibility of using a castable form of insulation has replaced paper insulation in many product areas and dominates the existing insulated bushing market.

electric motor bearings are a type of rolling bearing mounted on the rotor shaft of an electric motor, and are also a type of bearing specifically designed for use in electric motors, where their main function is to support and locate the rotor, keep the air gap small and consistent, and transfer the load from the shaft to the motor. electric motor bearings are able to operate at both low and high speeds while minimizing friction losses to ensure smooth, accurate operation of the shaft.

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Our bearings are made of high-quality materials to ensure that they perform well under various working conditions; we use advanced manufacturing technology and strict quality control, as well as continuous R&D and innovation, customized production to meet the changing needs of the market and customers. At the same time, the use of high-performance materials and lubrication technology to reduce friction and wear, improve operational efficiency, but also to ensure the high reliability of the bearing.

To improve the performance of paper insulated bushings, metallic foils can be inserted during the winding process. These act to stabilize the generated electrical fields, homogenising the internal energy using the effect of capacitance. This feature resulted in the condenser/capacitor bushing.

As a fhd bearing company, we know that the performance and quality of the electric motor are very useful, and choosing us allows customers to enjoy the high quality and technical advantages of our products.

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What isbushing in transformer

As with paper insulation, the control of electric stress fields remains important. Resin insulation has greater dielectric strength than paper and requires less stress control at voltages below 25 kV. However, some compact and higher rated switchgear designs, have earthed materials closer to bushings than in the past and these designs may require stress control screens in resin bushings operating as low as 12 kV Fixing points are often integral with the main resin form, and present fewer problems to earthed materials than the metal flanges used on paper bushings.

A basic porcelain bushing is a hollow porcelain shape that fits through a hole in a wall or metal case, allowing a conductor to pass through its center, and connect at both ends to other equipment. Bushings of this type are often made of wet-process fired porcelain, which is then glazed. A semi-conducting glaze may be used to assist in equalizing the electrical potential gradient along the length of the bushing.

What is bushingsused for

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First of all, bearing size determines its load capacity. Generally speaking, the larger the diameter and wider the width of the bearing, the stronger its load carrying capacity. Because the larger size can provide a larger radius of curvature of the rolling element raceway and more rolling element action area.For example, a deep groove ball bearing with a diameter of 55mm has a basic static load rating of 13.9kN, while a diameter of 100mm is 44.3kN. Sufficient load capacity ensures that the bearing will not be overloaded when the motor is running, and avoids premature wear.

For a bushing to work successfully over many years, the insulation must remain effective both in composition and design shape and will be key factors in its survival. Bushings can therefore vary considerably in both material and design style.

Bushings sometimes fail due to partial discharge. This is sometimes due to the slow and progressive degradation of the insulation over many years of energized service; however, it may also be a rapid degeneration which destroys a good bushing in a matter of hours. At present, there is great interest by the electricity supply industry in monitoring the condition of high-voltage bushings. However, some bushings failing early in service are due to failures to control voltage or carry out essential maintenance, while others relate to incipient failure mechanisms built in at manufacture. This view is evidenced by the minority of bushing failures worldwide.

SRBP insulated bushings are typically used up to voltages around 72.5 kV. However, above 12 kV, there is a need to control the external electrical field and to even out the internal energy storage which marginalises the dielectric strength of paper insulation.

A typical bushing design has a conductor, usually of copper or aluminium, occasionally of other conductive material, surrounded by insulation, except for the terminal ends.

Therefore, in the motor design stage, it is especially important to choose a reasonable bearing size. On the one hand, it is necessary to provide sufficient load capacity for the bearings according to the actual load condition of the motor; on the other hand, it is also necessary to consider the working speed of the motor, and the size should not be too large to avoid affecting the high-speed performance.

However, care must be observed in resin insulated bushings designs which use internally cast screens such that the benefit of electrical stress field control is not off set by increasing partial discharge caused by the difficulties of eliminating micro voids in the resin around the screens during the casting process. The need to eliminate voids in resin becomes more sensitive as voltages increases, and it is normal to revert to resin impregnated, foiled paper insulation for bushings rated over 72.5 kV.

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What is bushingson a car

The dimensions and internal layout of the motor must also be taken into account to avoid interference and constraints between the bearing selection and the motor.Compact needle roller bearings and deep groove ball bearings offer certain advantages in this respect. At the same time, the assembly tolerances of the bearings have to be met to ensure that they can be fitted accurately.

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Bushing vs ball bearing

Bearing size not only determines its load carrying capacity, but is also closely related to the maximum permissible speed of the motor. Choosing the right size of bearings is essential to maximize the performance of the motor.

Finally, the ease of maintenance and replacement of bearings should also be taken into account. Removable outer or inner rings are designed to facilitate maintenance, and lubrication of the bearings should be taken into account to ensure the overall maintainability of the motor.

In electric power, a bushing is a hollow electrical insulator that allows an electrical conductor to pass safely through a conducting barrier such as the case of a transformer or circuit breaker without making electrical contact with it. Bushings are typically made from porcelain, though other insulating materials are also used.

First of all, it is necessary to evaluate the load condition of the motor under working condition, including radial load, axial load and dynamic load, etc. Different types of bearings have different load carrying capacity and characteristics, which should be matched with the actual load. Different types of bearings have different load carrying capacity and characteristics, and should be selected to match the actual load.For example, tapered roller bearings are suitable for large combined loads, while angular contact ball bearings are mainly used for axial loads.

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Typically, paper insulation is later impregnated either with oil (historically), or more commonly today with resin. In the case of resin, the paper is film coated with a phenolic resin to become synthetic resin bonded paper (SRBP), or impregnated after dry winding with epoxy resins, to become resin impregnated paper or epoxy resin impregnated paper (RIP, ERIP).

Another early form of insulation was paper, however, paper is hygroscopic and absorbs moisture which is detrimental and is disadvantaged by the inflexible linear designs. Cast resin technology has dominated insulated products since the 1960s, due to its flexibility of shape and its higher dielectrical strength.

Types ofbushings

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Where partial discharge is required to conform to IEC 60137, paper and resin insulated conductors are used in conjunction with porcelain, for unheated indoor and outdoor applications.

Secondly, for the same type of bearing, the larger the size, the lower the maximum permissible speed. This is because an increase in size leads to an increase in centrifugal force and non-linear vibration of the rolling elements, thus limiting the maximum speed. Take 623 type deep groove ball bearing as an example, when the size is 17×40×12mm, the limiting speed is 33000rpm, while the limiting speed decreases to 18000rpm when the size is increased to 40×90×23mm. moderate size is favorable for the bearing to meet the demand of high speed motor.

A bushing must be designed to withstand the electrical field strength produced in the insulation, when any earthed material is present. As the strength of the electrical field increases, leakage paths may develop within the insulation. If the energy of the leakage path overcomes the dielectric strength of the insulation, it may puncture the insulation and allow the electrical energy to conduct to the nearest earthed material causing burning and arcing.

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A Finite element method analysis is usually performed before qualifying a bushing for use in a new equipment/location. This is specially true of bushings around high-voltage conductors. The electrical analysis usually focusses on the creation of the electric field around the conductor and how the shape of the bushing effects that field. The structural analysis considers the loads (wind, snow, earthquakes, rain, etc.) that the bushing is expected to survive.

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Bushing bearing

For buyers of global brand electric motor bearings, high-performance bearings can not only ensure stable and efficient operation of motors, but also effectively extend the maintenance cycle and reduce life cycle costs. At the same time, customized bearing design solutions will better meet the special needs of different application scenarios, which will help improve product competitiveness.

Motor in the actual application of the working environment environment on the bearing selection also has a significant impact.If it is high temperature, dustproof, anti-corrosion and other harsh environments, it is necessary to use special materials or special design of bearings to ensure good adaptability. Sealed bearings provide protection against contaminants, while ceramic bearings offer excellent resistance to high temperatures.

The operating speed of the motor is another important consideration. Higher speeds place higher demands on the thermal stability and lubrication properties of the bearings.Needle roller bearings and angular contact ball bearings usually have good high-speed performance and are suitable for high-speed motors. For low-speed large motors, more attention should be paid to the bearing capacity.

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The condenser bushing is made by inserting very fine layers of metallic foil into the paper during the winding process. The inserted conductive foils produce a capacitive effect which dissipates the electrical energy more evenly throughout the insulated paper and reduces the electric field stress between the energised conductor and any earthed material.

In the case of a busbar, the conductor terminals will support the busbar in its location. In the case of a bushing, a fixing device will also be attached to the insulation to hold it in its location. Usually, the fixing point is integral or surrounds the insulation over part of the insulated surface. The insulated material between the fixing point and the conductor is the most highly stressed area.

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