35kV High-Altitude Drop-Out Fuse Cutouts
PRWG2-35 / HPRWG2-35 – 35-40.5kV – 100/200A – <=3000m Altitude
35kV expulsion cutout rated for high-altitude operation up to 3000m. Extended creepage distance (935-1122mm), porcelain or composite insulator, 185kV BIL. For 35kV distribution lines, substation feeders and transformer protection.
OEM / ODM – Low-MOQ samples – Type-test reports
Overview
The PRWG2-35 series is the outdoor expulsion fuse cutout purpose-designed for 35kV medium-voltage distribution systems — a voltage class common in Chinese regional grids, mining operations, and long-distance rural feeders. The “P” prefix designates plateau (high-altitude) compatibility, with insulation coordinated for operation up to 3,000 meters above sea level.
At 35kV, insulation requirements jump substantially from the 10kV class: BIL rises from 110kV to 185kV, power-frequency withstand from 42kV to 95kV, and creepage distance from ~260mm to 870-935mm minimum (1,122mm at 2,000m altitude per GB/T 11022 altitude correction). The insulator body is correspondingly larger — a glazed porcelain column ~800mm tall, or a composite silicone-rubber shed profile of similar length but half the weight.
Weight and dimensions make proper mounting critical: the porcelain version weighs ~15-18 kg per phase, requiring a robust crossarm and careful lifting during installation. The composite (HPRWG2-35) variant uses a fiberglass core rod with HTV silicone sheds, reducing weight to approximately 10-14 kg while maintaining the same electrical ratings — strongly recommended for high-altitude sites where transport and handling are challenging.
Technical Specifications
| Rated Voltage | 35 kV (40.5 kV max) |
|---|---|
| Rated Current | 100 A / 200 A |
| Breaking Capacity | 5-8 kA sym. |
| BIL to ground | 185 kV |
| BIL across contacts | 215 kV |
| Power Freq Dry Withstand | 95 kV rms |
| Power Freq Across Contacts | 118 kV rms |
| Creepage (standard) | 870-935 mm |
| Creepage (2,000m altitude) | 1,122 mm (GB/T 11022 correction x1.2) |
| Weight (Porcelain) | 15-18 kg |
| Weight (Composite HPRWG2) | 10-14 kg |
| Operating Temp | -40 to +40 C |
| Altitude | <=1,000m (standard) / <=3,000m (plateau P-type) |
| Wind | <=700 N/m2 |
| Seismic | <=8 degrees |
| Standards | GB 15166 / IEC 60282-2 / DL/T 640 |
Range
| Model | Voltage | Current | Insulator | Altitude | Weight |
|---|---|---|---|---|---|
| PRWG2-35/100 | 35 kV | 100 A | Porcelain | <=1000m | ~15 kg |
| PRWG2-35/200 | 35 kV | 200 A | Porcelain | <=1000m | ~18 kg |
| HPRWG2-35/100 | 35 kV | 100 A | Composite (Polymer) | <=3000m | ~10 kg |
| HPRWG2-35/200 | 35 kV | 200 A | Composite (Polymer) | <=3000m | ~14 kg |
Plateau-type (P) models have altitude-corrected creepage and BIL ratings per GB/T 11022. 3-phase kits with mounting frame available.
Key Features
Insulation coordinated for 35kV systems with full lightning impulse withstand. Suitable for areas with high isokeraunic levels.
Altitude-corrected creepage per GB/T 11022 ensures reliable performance in thin-air conditions where flashover distance must increase to compensate for reduced air density.
Fiberglass core + HTV silicone sheds reduce weight by ~30% vs porcelain and eliminate cement-joint failure modes at altitude where thermal cycling is extreme.
Tested and certified for 3,000m operation. Standard models can be used up to 1,000m without derating.
At 35kV, the dropped-tube gap provides a clearly visible open point for safe line-crew isolation — more critical at this voltage than at 10kV.
Full breaking-test suite at independent labs (KEMA, XIHARI). Reports available for 35kV substation tender packages.
Applications
Primary protection for 35/10kV step-down transformers in regional substations.
35kV overhead lines covering 50-100km distances where fault current levels are moderate (5-8kA) and sectionalizing protection is needed.
35kV supplies to remote mining operations, quarries, and processing plants — often at altitude where the plateau-rated insulation is essential.
35kV collector lines in wind farms where compact, passive protection is preferred over circuit breakers at each turbine tap-off.
Frequently Asked Questions
What is the altitude correction for 35kV cutouts?
Porcelain or composite for 35kV?
What breaking capacity do I need at 35kV?
How is 35kV mounting different from 10kV?
Need 35kV Cutouts for a Plateau Installation?
Tell us altitude, voltage, and current — we will recommend the right model with altitude-corrected creepage.
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