Overview
Modern grid demands require switchgear that can withstand rigorous duty cycles while maintaining a minimal physical footprint. This 35kV
SF6 GIS fulfills these requirements by replacing traditional air insulation with a high-dielectric gas medium, allowing for a compact
design that fits into standard freight elevators or small basement rooms. The internal busbar system and switching components are shielded
from oxidation, making the unit an ideal candidate for long-term deployment in harsh industrial zones or coastal regions. Integrated with
digital protection relays and precision sensing technology, the equipment supports remote monitoring and automated fault isolation.
This versatility ensures it serves as a reliable cornerstone for both utility-scale substations and private high-voltage distribution networks,
adapting seamlessly to various feeder configurations.
Core Components and Features
The operational heart of the SF6 Ring Main Unit (RMU) is its high-end vacuum circuit breaker, designed for rapid arc quenching and mechanical
durability. Each unit features a triple-pole busbar arrangement crafted from electrolytic copper, ensuring high conductivity and thermal stability
during short-circuit events. A critical feature is the temperature-compensated density monitor, which provides real-time diagnostics of the gas
environment inside the hermetically sealed tank. For operator safety, the front panel is equipped with a mechanical mimic diagram and an
integrated earthing switch with a foolproof interlock system. The cable termination compartment is generously spaced for easy plug-in connection,
while the outer cabinet utilizes heavy-duty galvanized plating with an epoxy finish to prevent structural corrosion over decades of operation.
Design and Compliance
Design:
Structural integrity is prioritized through an Internal Arc Classification (IAC) design, which safely vents overpressure gases through dedicated
relief channels. This 35kV High Voltage SF6 Switchgear implements a "Sealed-for-Life" strategy, meaning the primary circuit is entirely isolated
from the atmosphere, preventing the buildup of moisture or dust. Mechanical interlocks are strictly enforced to prevent improper switching
sequences, ensuring compliance with global utility safety standards.
Compliance:
Engineering and testing phases are conducted in strict accordance with the IEC 62271-200 framework. Every Indoor SF6 Gas Filling Cabinet
35kV undergoes rigorous type-testing, including lightning impulse withstand and partial discharge analysis. These benchmarks verify the
equipment's capability to operate at rated voltages and frequencies in diverse global markets, guaranteeing that it meets the most demanding
technical specifications required by international grid operators.
Key Advantages
Optimized Spatial Efficiency
The use of gas insulation allows for a significant reduction in phase-to-phase clearance. This enables the 35kV Gas Insulated Switchgear (GIS)
to occupy up to 60% less volume than air-insulated alternatives, facilitating installation in high-density urban environments.
Atmospheric Immunity
Because the switching occurs in a controlled gas environment, the system is unaffected by salt spray, dust, or wildlife. This makes the High
Voltage Gas Insulated Switchgear particularly effective in mining operations or coastal wind farms where standard gear would suffer from
accelerated insulation degradation.
Low Total Cost of Ownership
As a Maintenance-Free SF6 Insulated Switchgear, the primary contacts are protected from the elements, eliminating the need for periodic
cleaning or internal lubrication. This translates to decades of reliable service with minimal onsite intervention.
Total Personnel Protection
The Metal-Clad Gas Insulated Switchgear 35kV design provides a continuous grounded metallic shield. All live parts are fully enclosed, ensuring
a "touch-safe" exterior for technicians working in the vicinity of the equipment.
Parameter
Insulation Medium |
SF6 Gas |
Rated Voltage |
35kV / 40.5kV |
Rated Current |
630A / 1250A |
Rated Frequency |
50Hz / 60Hz |
Customization |
Available |
Gas Leakage Rate (Annual) |
≤ 0.1% |
International Standard |
IEC 62271-200 |
Application Scenarios
Metropolitan Utility Hubs
In high-density cities, this 35kV Gas Insulated Switchgear (GIS) facilitates the construction of compact indoor substations. By reducing the
footprint by 60%, these units are easily installed in underground vaults or high-rise equipment levels. This enables utilities to deploy
infrastructure within commercial districts, ensuring stable power for skyscrapers without occupying premium street-level real estate.
Renewable Energy Integration
Wind and solar farms often operate in remote, salt-heavy or dusty environments. These systems are typically deployed within prefabricated
E-houses to manage power output from renewable clusters. The robust design provides a resilient grid interface while shielding internal
components from abrasive atmospheres and extreme weather fluctuations.
Industrial and Chemical Plants
Facilities requiring ultra-reliable power, such as semiconductor foundries or refineries, utilize this equipment to ensure an uninterrupted supply.
The hermetically sealed design protects sensitive primary components from corrosive process gases common in heavy industry. This isolation
guarantees long-term operational integrity and enhances personnel safety within hazardous zones.
Electrified Rail Systems
High-speed rail traction stations rely on the robust switching capabilities of the SF6 Ring Main Unit (RMU). Its ability to handle frequent load
variations and its small footprint make it ideal for the narrow corridors along electrified railway lines, ensuring modern locomotive fleets
operate with maximum efficiency.
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