Name: ShF-20G1 SDI37 Porcelain Pin Insulator With Stringing Sleeve
Brand: Pingxiang Risheng Electric Porcelain Co., Ltd.

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ShF-20G1 SDI37 Porcelain Pin Insulator With Stringing Sleeve

Product Overview

A 20 kV nominal pin insulator with a stringing sleeve, supplied to the ShF-20G1 and SDI37 designations. The sleeve holds the conductor during stringing so the crew is not fighting the tie while the line is under tension. Nominal creepage is not less than 325 mm, minimum bending failing load is 13 kN, and the unit weighs 2.1 kg. Puncture voltage in insulating medium is 180 kV.

Why Buyers Choose This Part

Stringing sleeve holds the conductor while the line is pulled in
13 kN minimum bending failing load on a 2.1 kg body
180 kV puncture voltage in insulating medium against a 20 kV nominal rating
Quoted average annual failure rate of no more than 0.0005 per year

Where It Is Used

20 kV distribution line construction where crews string by hand
Line sections rebuilt after storm damage under time pressure
Networks specified against ShF or SDI designations
Straight-line conductor support on pin spindles

Who It Suits

Overhead line construction crews at 20 kV
Utilities standardising on pin insulators with stringing sleeves
Distributors supplying ShF and SDI pattern insulators

What Goes Wrong Without The Right Part

Conductors that slip during stringing before the tie is made
Pin insulators that break in bending when the line is pulled off axis
Two designations, ShF-20G1 and SDI37, that buyers otherwise source separately
Failure rates that make line maintenance unpredictable

How It Is Built

20 kV nominal voltage
180 kV puncture voltage in insulating medium
75 kV dry and 60 kV wet 50 Hz withstand voltage
125 kV impulse withstand voltage
Nominal creepage not less than 325 mm
Minimum bending mechanical failing load 13 kN
2.1 kg weight
Average annual failures not more than 0.0005 per year

Published Figures For This Product

Every value below comes from the manufacturer data for this item. Figures not listed are confirmed against the drawing before an order is placed.

Nominal Voltage	20 kV
Puncture Voltage In Insulating Medium	180 kV
Impulse Withstand Voltage	125 kV
Creepage Not Less Than	325 mm
Minimum Bending Mechanical Failing Load	13 kN
Weight	2.1 kg

Materials

Electrical porcelain body
Stringing sleeve
Metal pin fitting

Process

Forming
Glazing
Firing
Sleeve and fitting assembly
Bending and puncture testing

Testing

Bending failing load proof test at 13 kN minimum
Puncture voltage test in insulating medium at 180 kV
Creepage verified against the 325 mm minimum

Certification

ISO 9001 quality management system

Customisation Options

Marked to ShF-20G1 or SDI37 as your drawing requires
Pin thread matched to your spindles
Produced to drawing or sample

How It Compares

ShF-20G1 with 400 mm creepage	The longer-creepage version raises the dry withstand to 85 kV and the impulse withstand to 135 kV. Choose it where the line runs through dirtier air.
ShF-10G	The 10G is the 10 kV class part with 256 mm creepage and a 12.5 kN bending load. The 20G1 is the 20 kV step up.

Before You Order And After It Arrives

Use the stringing sleeve as intended during pull-in, then complete the permanent tie
Keep bending load within 13 kN, particularly at angle poles
Confirm the spindle thread before ordering quantity
Inspect the sleeve seating at the first maintenance round after commissioning