Composite long-rod insulator 3FL3, SML 100 kN, 72.5 – 550 kV, one-piece HTV silicone housing on ECR FRP rod, suspension & tension
3FL3
- Specified mechanical load (SML) 100 kN, routine test load (RTL) 50 kN — every insulator leaves the factory after a routine tensile test at no less than 50% of SML held for at least 10 seconds
- One-piece HTV silicone rubber housing produced in a one-shot injection molding process, overmolding the triple junction point and part of the end fittings — no traditional sealing system, no moisture ingress path
- Boron-free, corrosion-resistant ECR glass FRP core rod with extremely high hydrolysis and acid resistance — eliminates the risk of brittle fracture
- Strongly hydrophobic HTV silicone housing keeps its pollution performance even in salt fog and dust-laden industrial air; no additional grading or corona rings needed up to 170 kV thanks to the integrated grading-ring end-fitting design
- Size-16 socket-and-ball, clevis 16L/16N, tongue 16L/16N, Y-clevis 19 and eye 24 couplings per IEC 60120 / IEC 60471 / IEC 61466-1; 100% exchangeable with existing insulators and line hardware, also available combined with line hardware and line surge arresters
Overhead line suspension stringsOverhead line tension stringsCompact-line applications with low towers and short spansHigh-pollution coastal and industrial areasLine surge arrester assemblies
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3FL3 covers 72.5–550 kV of the long-rod & station post range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product family | 3FL3 |
| Product type | Composite (silicone) long-rod insulator |
| Application | Suspension and tension on overhead lines, incl. compact-line designs with low towers and short spans |
| Housing | One-piece HTV silicone rubber, one-shot injection molding onto the rod |
| Hierarchy load class | 3FL3 insulators ≤ 100 kN (official product hierarchy, Tension and Suspension Insulators 3FL) |
Ratings
| Specified mechanical load (SML) | 100 kN (3FL family spans 70 – 630 kN) |
| Routine test load (RTL) | 50 kN |
| Highest voltage for equipment (Um) | 72.5 – 550 kV (nominal system voltages 60 – 500 kV) |
| Section length | 821 – 6,125 mm (with socket and ball), length increments 52 mm; intermediate, shorter or longer lengths on request |
| Creepage variants | Standard creepage (catalog code 3) or extra-high creepage (catalog code 4) |
| Sealing system | System A (triple point directly overmoulded in the HTV housing, family up to 210 kN) or System B (gap fully sealed with elastic silicone gel, family 100 – 630 kN) |
Representative ratings (socket and ball, standard creepage)
| Um < 72.5 kV | LIWL 449 kV · PFWL 160 kV · arcing 644 mm · creepage 1,706 / 2,291 mm (std / extra-high) · section length 821 mm · ~3.2 kg (3FL3 061-3SB11-1XX1) |
| Um 123 kV | LIWL 690 kV · PFWL 340 kV · arcing 1,112 mm · creepage 3,169 / 4,310 mm · section length 1,289 mm · ~4.1 kg (3FL3 108-3SB11-1XX1) |
| Um 245 kV | LIWL 1,220 kV · PFWL 571 kV · arcing 2,003 mm · creepage 6,096 / 8,348 mm · section length 2,225 mm · Ø210 mm corona ring HV side (3FL3 202-3SB11-1XS1) |
| Um 420 kV | LIWL 1,971 kV · SIWL 1,229 kV · PFWL 732 kV · arcing 3,399 mm · creepage 10,649 / 14,629 mm · section length 3,681 mm · Ø210 / Ø330 mm rings (3FL3 347-3SB11-1SM1) |
| Um 550 kV | LIWL 2,284 kV · SIWL 1,415 kV · PFWL 806 kV · arcing 4,362 mm · creepage 13,739 / 18,892 mm · section length 4,669 mm · Ø210 / Ø420 mm rings (3FL3 446-3SB11-1SL1) |
Mechanical / environment
| Core | ECR glass (boron-free) FRP rod — brittle-fracture resistant, hydrolysis- and acid-resistant |
| End fittings | Hot-dip galvanized forged steel or ductile cast iron, attached by monitored circumferential crimping; couplings: Socket and Ball 16 (IEC 60120), Clevis 16L/16N and Tongue 16L/16N (IEC 60471 / IEC 61466-1), Y-clevis 19, Eye 24 (IEC 61466-1) |
| End-fitting connection lengths V | Ball 16 = 108 mm · Socket 16A = 99 mm · Socket 16B = 103 mm · Clevis 16L = 119 mm · Tongue 16L = 118 mm · Y-clevis 19 = 127 mm · Eye 24 = 128 mm |
| Field control | Integrated grading ring in the end-fitting junction; external corona rings standard above 170 kV: Ø210 mm line end at 245 kV, Ø330 mm at 300/362 kV, Ø210 ground + Ø330 line at 420 kV, Ø210 ground + Ø420 line at 550 kV |
| Pollution performance | Strongly hydrophobic HTV silicone rubber — no conductive film even under salt fog or industrial dust |
Standards & certifications
| Design & type testing | IEC 61109, IEC 62217, IEC 60815, IEC 61466-1/-2; latest flyer additionally states ANSI C29.11, ANSI C29.12, CSA C411.4-16 |
| Routine test | Tensile load ≥ 50% of SML for ≥ 10 seconds on every insulator |
Documents & downloads
Catalog excerpt 3FL silicone long rod insulators — Power Engineering Guide (Edition 7.1) section 4.10 with 3FL2 – 3FL6 ratings and 3FL3/3FL4 technical data tables
Flyer 3FL long rod insulators — Composite technology up to 800 kV
Brochure Our portfolio of surge arresters & composite insulators — overhead line solutions incl. 3FL composite insulators up to 800 kV (current online edition)
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