ALP/33/720 Pin-Type Insulator Porcelain – AS2947.2-2002 Compliant for 33kV Overhead Power Lines
The ALP/33/720 Pin-Type Insulator Porcelain is a rugged and dependable solution for insulation and conductor support in 33kV overhead transmission and distribution lines. Manufactured to meet the rigorous requirements of AS2947.2-2002, the ALP/33/720 insulator ensures seamless integration into power networks across Australia, New Zealand, and other markets that follow Australian Standards.
The ALP/33/720 features a durable grey glazed porcelain finish, providing excellent weather resistance and long-term durability in outdoor environments. With its robust design, high creepage distance, and superior electrical strength, this insulator offers reliable pollution performance, exceptional mechanical strength, and competitive cost.
ALP/33/720 Pin-Type Insulator Porcelain – Designation Breakdown
The designation ALP/33/720 follows a logical product coding system:
| Code | Meaning |
| ALP | Product series / Manufacturer designator |
| 33 | Typical operating voltage (33 kV) |
| 720 | Nominal creepage distance (720 mm) |
ALP/33/720 Pin-Type Insulator Porcelain – Technical Specifications
| Parameter | Value |
| Model | ALP/33/720 |
| Standard | AS2947.2-2002 |
| Typical Application Voltage | 33 kV |
| Creepage Distance | 720 mm |
| Cantilever Strength | 11 kN |
| Power Frequency Puncture Voltage | 165 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/33/720 Pin-Type Insulator Porcelain – Key Features
Superior Electrical Performance – The ALP/33/720 insulator delivers reliable electrical performance for 33kV systems, with a nominal creepage distance of 720 mm that effectively increases leakage distance and reduces the risk of pollution flashover, guaranteeing safe operation of 33kV lines even under rain, fog, and 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 165 kV, providing an extra margin of safety against electrical breakdown under severe overvoltage conditions.
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.
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/33/720 Pin-Type Insulator Porcelain – Application Scenarios
The ALP/33/720 high‑voltage pin‑type insulator is ideal for:
- Insulation and conductor support in 33kV overhead distribution and transmission lines
- Outdoor installations with exposure to all atmospheric factors
- AC overhead power lines with frequencies not exceeding 100 Hz
- Power distribution networks in normal to moderately 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
ALP/33/720 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/33/720 Pin-Type Insulator Porcelain – Manufacturer
The ALP/33/720 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/33/720 | Standard: AS2947.2-2002 | Rated Voltage: 33 kV | Creepage Distance: 720 mm
Why Choose ALP/33/720 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
- Superior creepage distance – 720 mm ensures reliable operation in normal to moderately contaminated environments
- Proven reliability – engineered with high mechanical strength (11 kN cantilever strength) and robust electrical performance (200 kV lightning impulse withstand, 165 kV puncture voltage)
- 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 with reliable performance across diverse environmental conditions
ALP/33/720 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
This page is optimized for search engines with relevant keywords for the power equipment market.
