What are the USES and advantages of composite insulator?
composite insulator advantages: small volume, easy to maintain. Light weight, easy installation; High mechanical strength, not easy and broken; Good seismic performance is excellent, fouling resistance; Quick production cycle, high quality stability.
use composite insulator: early years insulator for pole, with the development of science and technology, gradually develop from one end of the high type high voltage wires hung up the many disc insulators, in order to increase the creepage distance, it is usually made of glass or ceramic call insulator. Insulator in overhead transmission lines with two basic role, namely support wire and prevent the current back, these two functions must be guaranteed, insulator should not change due to environmental and electrical load conditions lead to various electrical and mechanical stress and failure, or else there won't have a significant role in the insulator, will damage the whole line of use and operating life.( The composite insulator image)
due to its excellent composite insulator pollution flashover resistance is more and more widely applied to the transmission line, especially the uhv line, the use of the composite insulator has to more more, at present a lot of basic transmission line project is to use composite insulator. Firstly, it introduces the development, the development of composite insulator in our country and its application, and selection method of composite insulator is presented practical, also should pay attention to the installation of the insulator string form and installation method. Composite insulator according to the use of different characteristics, its end hardware structure is different, the domestic used for synthesis of the transmission line insulator most used 'ball head - Bowl of head 'structure. Metal end design in addition to meet zhang qiang degree resistance, meet the requirements, reliable connection and a mandrel, also need to meet the special requirements of under high voltage application. Composite insulator are generally made from bar, small capacitance. In normal work, the corona will bring harm, so you need to adopt measures of equalizing, synthetic insulation material intolerance to tens of thousands of arc current, Ann in fault worsened the umbrella of near the wires and tower plate burning, so need to adopt measures arc starting, both at home and abroad generally adopt the method of adding equalizing ring to end electric field, corona, away arc fault. Composite insulator is need long-term operation of external insulation devices, design requirements for the general service life for at least 30 ~ 50 years.
the overall composite insulator rod type design, compact structure, high quality, the weight is the same level of porcelain and glass insulator 1/10, transportation is extremely convenient installation. Suitable for polluted area, high mechanical tensile load, large span and compact circuit.
the dirt lightning ratio increased by 30% - with porcelain and glass insulator 50%. In - 60℃- - - - - - - 200 ℃ ambient temperature stable performance; The breakdown type design, don't need to test in the operation of the zero value.
the advantages of composite insulator are:
( 1) The filth of the excellent performance. Silicon rubber umbrella cover material surface is not only in the new time is hydrophobic, and under the condition of the line running, when hydrophobic temporarily lost, also can restore its hydrophobic. Water formed in the surface water, liquid silicone rubber is very thin film basically engulfed unclean, thus inhibiting the ionic substances dissolved in the water, provides high surface resistance, reduce the leakage current, improve the defiled flashover voltage. This performance even remain silicone rubber materials aging. Thus increasing the reliability of power transmission, significantly reduced the insulator of cleaning and maintenance costs.
( 2) Excellent uv resistance ability, resistance to erosion, xiamen recycling doesn't mark.
( 3) Small size, light weight 110 kv / 100 kn composite long rod insulator weight was only about 70 kn porcelain insulator correspondingly by 12%. Such a light weight greatly save the installation transportation cost, it tends to be no crane, and particularly suitable for emergency repair and transport line can't close to mountain line erection, maintenance; Can simplify the structure of tower, the larger span is allowed ( Reduce the number of poles) ; And provide the conditions for the development of compact line.
( 4) The production and delivery time is much shorter than porcelain insulator.
( 5) Don't need to zero insulation resistance testing.
( 6) Without this brittle faults characteristics is not only beneficial to the installation of transport, but also makes it to arc resistance ability of washing machine is much higher than the porcelain insulator.
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