Thick-wall pre-cut insulation sections for 35 kV busbars, verified at 105 kV power frequency withstand.
| Models | MPG35 |
|---|---|
| Operating temp | -40 to +105 °C |
| Voltage class | 35 kV |
| Standards | GB/T 12706, UL 94 V-0, RoHS |
MPG35 is the highest voltage grade of the MPG busbar tubing family: a thick-wall radiation-crosslinked polyolefin product formulated for insulating copper and aluminum busbars in 35 kV distribution equipment. Its 2.0+ mm recovered walls and 105 kV power frequency withstand capability bring shrink-to-fit insulation to primary distribution switchgear that previously required large air clearances or custom-molded covers.
MPG35 is supplied as pre-cut 1 m sections sized to standard busbar widths, which are slipped over the busbar before joint assembly. Upon heating to 110-130°C, each section recovers to grip the busbar surface without adhesive, relying on mechanical shrink force to maintain permanent contact. Busbar joint protection boxes are available per customer requirements for T-joints, L-joints and cross-overs.
| Property | Test Method | Requirement |
|---|---|---|
| Limited oxygen index (LOI) | — | >30 |
| Low-temperature flexibility | -40°C | No cracking |
| Flame retardancy | UL 94 | V-0 equivalent |
| Tracking resistance | IEC 60587 | 1A 4.5 kV (typical for crosslinked PO) |
| Property | Test Method | Typical Value |
|---|---|---|
| Long-term operating temperature | — | 105°C |
| Tensile strength | ASTM D638 | 11 MPa |
| Elongation at break | ASTM D638 | 300% |
| Volume resistivity | IEC 93 | 2×10¹⁴ Ω·cm |
| Water absorption | ISO 62 | <0.5% |
| Tensile after aging (158°C, 7 d) | ASTM D638 | 11 MPa |
| Elongation after aging (158°C, 7 d) | ASTM D638 | 310% |
| Dielectric strength | IEC 243 | 23 kV/mm |
| Power frequency withstand | — | 105 kV, 60 s, no flashover |
| Wall bias | — | 15% |
| Longitudinal change (200°C, 3 min) | — | -5% |
Internal test data. Questions on parameters? Contact our engineers.
| Model | Busbar Width (mm) | Recovered ID (mm) | Section (mm) |
|---|---|---|---|
| MPG35-XX-25/10 | 20-30 | <10 | Φ25 × 1000 |
| MPG35-XX-30/12 | 30-40 | <12 | Φ30 × 1000 |
| MPG35-XX-40/16 | 40-50 | <16 | Φ40 × 1000 |
| MPG35-XX-50/20 | 50-60 | <20 | Φ50 × 1000 |
| MPG35-XX-65/25 | 60-70 | <25 | Φ65 × 1000 |
| MPG35-XX-75/30 | 80-90 | <30 | Φ75 × 1000 |
| MPG35-XX-85/35 | 90-100 | <35 | Φ85 × 1000 |
| MPG35-XX-100/45 | 120 | <45 | Φ100 × 1000 |
| MPG35-XX-120/50 | 140 | <50 | Φ120 × 1000 |
| MPG35-XX-150/60 | 180 | <60 | Φ150 × 1000 |
| MPG35-XX-200/60 | 240 | <60 | Φ200 × 1000 |
Standard color: black. Custom colors available — contact our sales team.
Cover main, distribution and tie busbars in 35 kV metal-clad switchgear. Pre-cut sections and joint boxes replace custom-molded boots at every busbar joint.
Insulate isolated phase bus and non-segregated phase bus runs in power generation facilities. The tracking-resistant formulation handles thermal cycling and vibration in rotating machine connections.
Insulate LV bushing leads and delta connections in dry-type and oil-filled transformer enclosures. The 105°C continuous rating matches Class A and Class B insulation systems.
Still deciding? Contact our engineers.
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