ShF-20G1 Ceramic Pin Insulator 400mm Creepage
Pin Type Insulators
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.
Key benefits
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
Application scenarios
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 is for
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
Problems it solves
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
Technical features
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
Specifications
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
Materials
- Electrical porcelain body
- Stringing sleeve
- Metal pin fitting
Manufacturing
Process
- Forming
- Glazing
- Firing
- Sleeve assembly
- Electrical and bending test
Quality control
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
Certifications
Certification
- ISO 9001 quality management system
Customisation
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
Comparison
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. |
Use guide
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
Questions
ShF-20G1 Ceramic Pin Insulator 400mm Creepage Questions
How does this differ from the 325 mm creepage ShF-20G1?
Creepage rises to 400 mm nominal, dry withstand from 75 kV to 85 kV, wet from 60 kV to 65 kV and impulse withstand from 125 kV to 135 kV. Bending load stays at 13 kN minimum.
What is the creepage tolerance?
400 mm plus or minus 10 mm.
What is the puncture voltage?
180 kV in insulating medium.
What is the quoted failure rate?
An average of not more than 0.0005 failures per year.
What weight should I allow per unit?
The published weight figure for this listing is inconsistent, so ask us on WhatsApp and we will confirm the shipping weight before you book freight.
Does it come with the stringing sleeve?
Yes, the stringing sleeve is part of this listing.
Related
Related Products
QS11404 QS11405 IEC Pin Post Insulator 22kV 12.5kN
- Cantilever Strength On Both 12.5 kN
- Dry Power Frequency Withstand Voltage 90 kV
- Wet Power Frequency Withstand Voltage 65 kV
ALP22-450 Pin Type Porcelain Insulator 22kV
- Creepage Distance 450 mm
- Lightning Impulse Withstand Voltage 150 kV
- Wet Power Frequency Withstand Voltage 50 kV
ShF-10MO Pin Type Ceramic Insulator
ANSI 57-14 Line Post Porcelain Insulator 1015mm Creepage
- Creepage Distance 1015 mm
- Dry Arcing Distance 368 mm
- Cantilever Strength 12.5 kN
Quote For ShF-20G1 Ceramic Pin Insulator 400mm Creepage
Send the quantity and any drawing you have. Enquiries are answered within 24 hours, and we produce to customer drawings and samples.