ALP/33/920 Pin-Type Insulator Porcelain – Designation Breakdown
The designation ALP/33/920 follows a logical product coding system:
| Code | Meaning |
| ALP | Product series / Manufacturer designator |
| 33 | Typical operating voltage (33 kV) |
| 920 | Nominal creepage distance (920 mm) |
ALP/33/920 Pin-Type Insulator Porcelain – Technical Specifications
| Parameter | Value |
| Model | ALP/33/920 |
| Standard | AS2947.2-2002 |
| Typical Application Voltage | 33 kV |
| Creepage Distance | 920 mm |
| Cantilever Strength | 11 kN |
| Power Frequency Puncture Voltage | 185 kV |
| Lightning Impulse Withstand Voltage | 200 kV |
| Wet Power Frequency Withstand Voltage | 70 kV |
| Thread Type | “C” thread with zinc sleeve |
| Color | Grey |
| Surface Finish | Full glaze, except where marked |
| All Dimensions | In millimeters |
| Applicable Standard | AS2947.2-2002 |
ALP/33/920 Pin-Type Insulator Porcelain – Key Features
Superior Electrical Performance – The ALP/33/920 insulator delivers reliable electrical performance for 33kV systems, with an extended nominal creepage distance of 920 mm that effectively increases leakage distance and significantly reduces the risk of pollution flashover, guaranteeing safe operation of 33kV lines even under heavy rain, fog, and highly contaminated conditions.
High Mechanical Strength – With a cantilever strength of 11 kN, the insulator reliably withstands conductor tension, wind loads, and ice accretion, ensuring long‑term stability in overhead line installations.
High Puncture Resistance – The insulator features a power frequency puncture voltage of 185 kV, providing a substantial margin of safety against electrical breakdown under severe overvoltage conditions – 20kV higher than the ALP/33/720 model.
Superior Impulse Withstand – With a lightning impulse withstand voltage of 200 kV and wet power frequency withstand voltage of 70 kV, the insulator offers robust protection against lightning strikes and harsh weather conditions.
Extended Creepage for Pollution Performance – The 920mm creepage distance makes this insulator particularly suitable for areas with moderate to heavy pollution levels, including coastal regions, industrial zones, and agricultural areas with high dust or salt exposure.
Corrosion-Resistant Thread – The “C” thread with zinc sleeve eliminates galling and ensures long-lasting, maintenance-free assembly with metal fittings.
Glazed Porcelain Finish – The insulator features a durable grey glaze coating that provides excellent weather resistance, UV protection, and self‑cleaning properties, ensuring long‑term performance in harsh outdoor environments.
Reliable Design – Engineered for long‑term reliable operation with minimal maintenance requirements – regular visual inspections and cleaning are typically sufficient to ensure continued performance.
ALP/33/920 Pin-Type Insulator Porcelain – Application Scenarios
The ALP/33/920 high‑voltage pin‑type insulator is ideal for:
- Insulation and conductor support in 33kV overhead distribution and transmission lines, particularly in areas with higher pollution levels
- Outdoor installations with exposure to all atmospheric factors, including coastal, industrial, and agricultural environments
- AC overhead power lines with frequencies not exceeding 100 Hz
- Power distribution networks in normal to heavily contaminated environmental conditions
- Installation on wooden, reinforced concrete, and metal poles
- Medium voltage distribution networks in Australia, New Zealand, and other AS‑standard markets
- Mounting options – can be used vertically or horizontally
- Projects requiring extended creepage distance for enhanced pollution flashover protection
ALP/33/920 Pin-Type Insulator Porcelain – Standards Compliance
| Standard | Description |
| AS2947.2-2002 | Insulators for overhead power lines – Porcelain and glass – Part 2: Pin insulators |
| AS/NZS 2947.1 | Test methods – Insulator units |
| AS 1824.1 | Insulation co‑ordination – Definitions, principles and rules |
| AS 4436 | Guide for the selection of insulators in respect of polluted conditions |
ALP/33/920 Pin-Type Insulator Porcelain – Manufacturer
The ALP/33/920 Pin-Type Insulator Porcelain is manufactured by Bonle (Fujian) Insulator Co., Ltd., a leading Chinese insulator manufacturer with decades of experience in power line products. The manufacturer holds ISO 9001 certification and produces insulators in accordance with IEC, ANSI, ASTM, AS, BS, DIN, and ISO standards. All products undergo rigorous electrical and mechanical testing before shipment, ensuring the highest quality standards.
Designer: Wu Ren Guo
Model: ALP/33/920 | Standard: AS2947.2-2002 | Rated Voltage: 33 kV | Creepage Distance: 920 mm
Why Choose ALP/33/920 Pin-Type Insulator Porcelain for Your Power Grid?
- Full AS compliance – meets AS2947.2-2002 standard, ensuring smooth acceptance by grid operators and regulatory bodies in Australia and New Zealand
- Extended creepage distance – 920 mm provides superior pollution performance, making it ideal for coastal, industrial, and high-contamination areas
- Higher puncture voltage – 185 kV puncture voltage offers 20kV higher safety margin compared to standard 33kV insulators
- Proven reliability – engineered with high mechanical strength (11 kN cantilever strength) and robust electrical performance (200 kV lightning impulse withstand)
- Corrosion-resistant design – “C” thread with zinc sleeve eliminates galling and ensures maintenance-free assembly
- Weather‑resistant – grey glazed porcelain finish provides excellent weather resistance and UV protection
- Cost‑effective – high performance at competitive pricing, reducing total project costs
- Versatile – suitable for 33kV applications in diverse environmental conditions, from clean rural areas to heavily polluted industrial zones
ALP/33/920 Pin-Type Insulator Porcelain – References & Authoritative Resources
For certification, standard compliance, and procurement specifications, refer to:
- AS2947.2-2002 – Insulators for overhead power lines – Porcelain and glass – Part 2: Pin insulators
- AS/NZS 2947.1 – Test methods – Insulator units
- AS 4436 – Guide for the selection of insulators in respect of polluted conditions
- Full Range of Pin Insulators – explore our complete product portfolio for transmission and distribution lines
Comparison: ALP/33/720 vs ALP/33/920
| Parameter | ALP/33/720 | ALP/33/920 |
| Creepage Distance | 720 mm | 920 mm |
| Puncture Voltage | 165 kV | 185 kV |
| Cantilever Strength | 11 kN | 11 kN |
| Lightning Impulse | 200 kV | 200 kV |
| Wet Power Frequency | 70 kV | 70 kV |
| Thread Type | “C” with zinc sleeve | “C” with zinc sleeve |
| Color | Grey | Grey |
| Standard | AS2947.2-2002 | AS2947.2-2002 |
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