Reliable 35kV Outdoor Isolator Switch for Overhead Lines – HGW9-35

The HGW9-35 outdoor isolator switch is a single-pole, 35kV isolator designed for medium-voltage overhead lines, used for visible disconnection during inspection, maintenance, or system isolation. It provides reliable mechanical performance and high insulation clearance, especially in rural or suburban distribution systems.

🔧 Product Overview

The HGW9-35 AC Isolator switch is manually operated and installed on outdoor steel structures or concrete poles. It ensures clear physical disconnection between live conductors, preventing accidental energization. The rotating knife-type contact mechanism offers fast operation and minimal contact wear.

Key Features:

• Designed for 35kV systems (single-pole)

• Suitable for overhead line sectionalizing and transformer isolation

• High creepage distance for contaminated areas

• Rugged galvanized steel and porcelain construction

• Easy to install and maintain

📐 Technical Specifications

🌍 Typical Applications

• Sectionalizing overhead rural power lines

• Disconnecting transformers or capacitor banks

• Outdoor substation bay disconnection

• Temporary line isolation for maintenance

• Renewable energy collection lines (e.g., wind or solar farms)

📊 Real Case Study

🔷 Vietnam EVN Rural Distribution Upgrade (2021)
In a 2021 initiative by EVN (Vietnam Electricity), HGW9-35 Isolatorswitches were deployed in over 300 remote distribution points across northern Vietnam.
Results:

• Improved worker safety during live-line maintenance;

• Simplified transformer replacement in rural zones;

• Reliable performance under high humidity and monsoon conditions.

Source: EVN North Grid Project Report, 2021

🛠 Installation Guide

1. Mount the switch on a concrete pole or steel cross-arm.

2. Connect the line conductors with flat aluminum terminal pads.

3. Ground the base if required by the design.

4. Use an insulated hookstick or operating lever for disconnection.

5. Test the mechanical movement before energizing.

Note: Phase spacing should follow local utility standards (typically 600–1000mm).

❓ Frequently Asked Questions (FAQ)

1. What is the difference between HGW9-35 and GW4/GW5 switches?
HGW9 is a single-pole vertical opening switch, while GW5 is typically three-pole with double breaks. HGW9 is simpler and more suitable for pole-mounted systems.

2. Can it be used in coastal or polluted areas?
Yes. Its porcelain insulators have an extended creepage distance to resist flashovers.

3. Is the switch motorized?
No. HGW9-35 is a manual switch. Motorized or remote versions are available in other models.

4. What type of maintenance is required?
Visual check and greasing of the contact blade mechanism every 1–2 years is recommended.

5. Does it include a grounding switch?
This model is a disconnect only. Grounding switches can be integrated in the GW22 or GW4 series.

📞 Request Drawing, Quote, or Custom Design

Looking for installation drawings, type test reports, or OEM options?

Get in touch with our engineer directly:

• Engineer: Thor

• Company: Wei Shoe Elec

• Phone: +86-0577-62788197

• WhatsApp: +86 159 5777 0984

• Email: [email protected]

We support custom pole brackets, terminal configurations, and fast delivery for utility clients worldwide.