Name: ShF-20G1 Ceramic Pin Insulator 400mm Creepage
Brand: Pingxiang Risheng Electric Porcelain Co., Ltd.

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ShF-20G1 Ceramic Pin Insulator 400mm Creepage

Product Overview

The long-creepage listing of the ShF-20G1 pin insulator with stringing sleeve, built to a nominal creepage of 400 mm plus or minus 10 mm. The extra leakage path raises the dry 50 Hz withstand to 85 kV, the wet figure to 65 kV and the impulse withstand to 135 kV, against the same 180 kV puncture voltage in insulating medium and 13 kN minimum bending failing load.

Why Buyers Choose This Part

400 mm nominal creepage for lines through polluted or coastal air
85 kV dry and 65 kV wet 50 Hz withstand voltage
135 kV impulse withstand for lightning-exposed corridors
Same 13 kN bending rating as the standard version, so pole design does not change

Where It Is Used

20 kV lines crossing industrial or coastal areas
Sections with a record of pollution flashover on standard pin insulators
New line construction specified at a higher pollution class
Replacement programmes upgrading insulation without changing spindles

Who It Suits

Line engineers raising the insulation class on an existing route
Contractors building 20 kV lines in dirty air
Utilities reducing pollution-related outage counts

What Goes Wrong Without The Right Part

Flashover on 325 mm creepage insulators at polluted sites
Upgrade projects that would otherwise need new pole hardware
Lightning trips on lines with too little impulse margin
Uncertain failure rates in bulk pin insulator deliveries

How It Is Built

20 kV nominal voltage
Nominal creepage 400 mm plus or minus 10 mm
180 kV puncture voltage in insulating medium
85 kV dry and 65 kV wet 50 Hz withstand voltage
135 kV impulse withstand voltage
Minimum bending mechanical failing load 13 kN
Average annual failures not more than 0.0005 per year
Supplied with stringing sleeve

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	135 kV
Minimum Bending Mechanical Failing Load	13 kN

Materials

Electrical porcelain body
Stringing sleeve
Metal pin fitting

Process

Forming
Glazing
Firing
Sleeve assembly
Electrical and bending test

Testing

Creepage measured against the 400 mm plus or minus 10 mm figure
Impulse withstand verification at 135 kV
Bending failing load proof test at 13 kN minimum

Certification

ISO 9001 quality management system

Customisation Options

Standard 325 mm creepage version available from the same family
Pin thread and sleeve type to your specification
Produced to drawing or sample

How It Compares

ShF-20G1 SDI37 at 325 mm creepage	This version adds 75 mm of creepage and lifts the dry withstand from 75 kV to 85 kV and the impulse withstand from 125 kV to 135 kV, at the same bending rating.
ZS-770 pin post insulator	The ZS-770 goes much further at 770 mm creepage and 16 kN. Use it only where pollution is severe enough to justify the larger body.

Before You Order And After It Arrives

Select creepage from the measured site pollution severity, not from voltage alone
Use the stringing sleeve during pull-in and complete the permanent tie afterwards
Check that a 400 mm creepage body clears neighbouring phases on the crossarm
Keep bending loads within 13 kN at angle and terminal poles