Quick Details
Description
- Place of Origin: Zhejiang, China (Mainland)
- Brand Name: Saip/Saipwell
- Model Number: FZSW4-12/8
- rated voltage: 12kv
- rated bending load: 8kn
- structure height(mm): 265_+10mm
- insulating distance(mm): 155mm
- Min normal creepage distance(mm):430mm
- Lighting current impulse: 75kv
- PF wet withstand voltage 1min: 45kv
Insulators used for high-voltage power transmission are made from glass, porcelain or composite polymer materials. Porcelain insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4–10 kV/mm.Glass has a higher dielectric strength, but it attracts condensation and the thick irregular shapes needed for insulators are difficult to cast without internal strains.
The electrical breakdown of an insulator due to excessive voltage can occur in one of two ways:
A puncture arc is a breakdown and conduction of the material of the insulator, causing an electric arc through the interior of the insulator. The heat resulting from the arc usually damages the insulator irreparably.Puncture voltage is the voltage across the insulator (when installed in its normal manner) that causes a puncture arc.
A flashover arc is a breakdown and conduction of the air around or along the surface of the insulator, causing an arc along the outside of the insulator. They are usually designed to withstand this without damage.Flashover voltage is the voltage that causes a flash-over arc.
Most high voltage insulators are designed with a lower flashover voltage than puncture voltage, so they flash over before they puncture, to avoid damage.
Suspension insulator - For voltages greater than 33 kV, it is a usual practice to use suspension type insulators, consisting of a number of glass or porcelain discs connected in series by metal links in the form of a string. The conductor is suspended at the bottom end of this string while the top end is secured to the cross-arm of the tower. The number of disc units used depends on the voltage.
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Model
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U70B/140
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minimum mechanical failing load,kn
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70
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minimum mechanical residual strength, kn
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35
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diameter of the insulator part,D, mm
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290
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spacing, H, mm
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140
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nominal creepage distance, mm
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320
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conditional size of spherical joint according to GOST 27396-93,IEC 120-84
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16
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puncture voltage in insulating medium, kv
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130
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50 Hz withstand voltage (dry), kv
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100
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50Hz withstand voltage (wet), kv
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40
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radio interference voltage(μv)
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50
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weight, kg
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3.6
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Our company specializes in the design, production and sales of electric equipment. Our head office is located in the largest manufacturing base of electric equipment China.
We have six specialized branches and over 333 specialized cooperative partners. As an ISO9001 certificated enterprise, our company owns modern production lines and high quality controlling equipment with scientific administration, professional engineers, highly trained technicians and skilled workers.
Our products cover low-voltage apparatus, welding equipment, instruments and meters, photoelectron products and electrical products for construction and new energy. Our products are sold to more than 120 countries and regions. All exported products have passed the evaluation of CE certification, and some have also attained RoHS, TUV, UL, KEMA and other certifications.
