110kV 145kV 170kV 220kV 363kV RIP Transformer Bushing
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Transformer Bushing
110kV 145kV 170kV 220kV 363kV RIP Transformer Bushing


Bushings history


01 - Porcelain insulation

The earliest casing design uses electrical porcelain for indoor and outdoor use. Once sealed with glaze, ceramic impervious to water, low cost, manufacturing flexibility. The main drawback of porcelain is that its linear expansion of small value must be solved through the use of flexible sealing and a large number of metal parts, both of which have manufacturing and operational problems.

A basic porcelain shell is a hollow porcelain shape that can pass through a hole in a wall or metal shell so that the conductor passes through its center and connects the two ends to other devices. This type of bushing is usually made of porcelain made of wet - fired porcelain and then glazed. A semiconductor glaze can be used to help balance the electric potential gradient along the length of the bushing.

The porcelain sleeve is often filled with oil to provide additional insulation, and the casing of the structure is widely used for up to 36KV, allowing for higher partial discharge.

The paper and resin insulated conductors are used together with China for non-heating indoor and outdoor applications where the local discharge is required to comply with IEC60137.

Although the vast majority of a high-pressure casing is usually made out of resin impregnated paper insulation around the conductor, but ceramic or polymer weather shed can be used for high voltage applications but is often used in a high-pressure application of resin (polymer, polymer, composite materials) insulation casing for indoor.

 

02 -Paper insulation

Another early form of insulation is paper, however, the paper is hygroscopic and absorbs moisture, which is harmful and is detrimental due to inflexible linear design. Since the 1960s, casting resin technology has been dominated by insulation products due to its flexibility and high dielectric strength.

Usually, paper insulation is then impregnated with oil (historically) or more commonly used as the resin. In the case of resin, the paper USES the phenolic resin film as a synthetic resin adhesive paper (SRBP) or impregnated with epoxy resin impregnated paper or epoxy-impregnated paper (RIP, ERIP).

The SRBP insulated sleeve is usually used for voltage up to 72.5kV. However, above 12kV, it is necessary to control the external electric field and balance the internal energy storage, which marginalizes the dielectric strength of paper insulation.

In order to improve the performance of paper insulating sleeve, the metal foil can be inserted during winding. They are used to stabilize the generated electric field and use capacitance to homogenize the internal energy. This function results in condenser/condenser sleeve.

The condenser sleeve is made by inserting a very fine metal foil layer into the paper during winding. The inserted conductive foil produces a capacitive effect that distributes power more evenly across the entire insulating paper and reduces the electric field stress between the electrical conductor and any grounding material.

Condenser casing produced by electrical stress field around the fixed flange than not using foil were much lower efficiency, and when used with resin impregnated, the casing can be used in more than 1 million service voltages and achieved great success.


03 - Resin insulation

Since 1965, resin material has been used in all types of bushings to reach the highest voltage. The flexibility to use castable insulators in many product areas replaces paper insulation and dominates the existing insulated casing market.

As with paper insulation, the control of the electrical stress field is still important. Resin insulators have greater dielectric strength than paper and require less stress control under the voltage of 25kV. However, some switchgear design compact and higher ratings than in the past are closer to the bushing grounding material, and the design may need to be as low as 12 kv resin bushing in stress control panel. The fixed point is usually integrated with the main resin form, and the problem of grounding material is less than the metal flange used on the paper sleeve. Screen mesh in the use of internal casting resin insulated, however, must pay attention to in the design of casing, so that the benefits of electroforming stress field control will not due to eliminate screen during casting resin around the difficulties of the tiny gap and increase the partial discharge and set processing. With the increase of voltage, the need to eliminate voids in the resin becomes more sensitive, and it is normal for the resin-impregnated foil insulation to be restored to the casing with a rating of over 72.5kv.

ChinSun RIP bushing voltage range is 10kV~363kV.


110kV 145kV 170kV 220kV 363kV RIP Transformer Bushing

110kV 145kV 170kV 220kV 363kV RIP Transformer Bushing


110kV 145kV 170kV 220kV 363kV RIP Transformer Bushing

110kV 145kV 170kV 220kV 363kV RIP Transformer Bushing


110kV 145kV 170kV 220kV 363kV RIP Transformer Bushing


  • Electrical data
Technical standardsGB/T 4109-2008 IEC   60137 Ed.6.0
Rated voltage145kV170kV
Rated current630-1250A
1min power frequency dry(wet) voltage withstand305275kV355325kV
Full-wave impulse withstand voltage of lighting650kV750kV
Under 1.05 times of maximum phase voltage tan δ≤0.005
Partial discharge under the rated voltage≤10pC
Bending resistant test load3150N3150N
The minimum nominal creepage distance31mm/kV
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