ShF-20G1 SDI37 Porcelain Pin Insulator With Stringing Sleeve
Pin Type Insulators
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.
Key benefits
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
Application scenarios
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 is for
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
Problems it solves
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
Technical features
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
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 | 125 kV |
| Creepage Not Less Than | 325 mm |
| Minimum Bending Mechanical Failing Load | 13 kN |
| Weight | 2.1 kg |
Materials
Materials
- Electrical porcelain body
- Stringing sleeve
- Metal pin fitting
Manufacturing
Process
- Forming
- Glazing
- Firing
- Sleeve and fitting assembly
- Bending and puncture testing
Quality control
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
Certifications
Certification
- ISO 9001 quality management system
Customisation
Customisation Options
- Marked to ShF-20G1 or SDI37 as your drawing requires
- Pin thread matched to your spindles
- Produced to drawing or sample
Comparison
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. |
Use guide
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
Questions
ShF-20G1 SDI37 Porcelain Pin Insulator With Stringing Sleeve Questions
What does the stringing sleeve do?
It holds the conductor in place while the line is being pulled in, so the crew is not making the permanent tie under tension.
What creepage distance does it give?
Not less than 325 mm nominal.
What is the minimum bending failing load?
13 kN.
What is the weight?
2.1 kg.
Are ShF-20G1 and SDI37 the same item?
They are the two designations under which this insulator is listed. Tell us which one appears on your drawing and we will mark it accordingly.
What is the impulse withstand voltage?
125 kV, with 180 kV puncture voltage in insulating medium.
Related
Related Products
ZS-770 Pin Post Porcelain Insulator 770mm Creepage
- Creepage Distance 770 mm
- Rated Electromechanical Failing Load 16 kN
- Lightning Impulse Withstand Voltage 190 kV
ShF-20G1 Ceramic Pin Insulator 400mm Creepage
- Nominal Voltage 20 kV
- Puncture Voltage In Insulating Medium 180 kV
- Impulse Withstand Voltage 135 kV
P-33-Y Pin Type Porcelain Insulator 900mm Creepage
- Recommended Pin Height 305 mm
- Cantilever Strength 10 kN
- Type Application Voltage 36 kV
N95-4 Pin Type Ceramic Insulator 13.6kN
- Top Diameter D1 80 mm
- Minimum Inner Diameter D 100 mm
- Minimum Spindle Diameter D1 25.4 mm
Keep reading
Related Cases Guides And Applications
Guide
The Five Jobs An Insulator Does Inside A High Voltage Transformer
GuideHow To Choose Creepage Distance For A Polluted Site
GuideToughened Glass And Porcelain Insulators Compared
IndustryPower Utilities And Substations
IndustryOverhead Line Contractors
SolutionManufacturing To Your Drawing Or Sample
SolutionSelecting Creepage For The Pollution At Your Site
Quote For ShF-20G1 SDI37 Porcelain Pin Insulator With Stringing Sleeve
Send the quantity and any drawing you have. Enquiries are answered within 24 hours, and we produce to customer drawings and samples.