Fixed Type Switchgear
Product Overview
The Fixed Type Switchgear is a metal-enclosed medium-voltage switchgear assembly engineered for electrical power distribution, circuit protection, measurement, and control in industrial, utility, and infrastructure power systems.
Unlike withdrawable switchgear, the main switching device is secured in a fixed position inside the circuit breaker compartment. This fixed configuration is tailored for applications where the circuit breaker does not require a withdrawable mechanism for routine connection, testing, or isolation, thereby providing a rigid, high-integrity structural setup.
The switchgear integrates fixed-mounted vacuum circuit breakers with busbars, current transformers, earthing switches, protection relays, metering devices, and auxiliary control components within a compartmentalized metal enclosure.
Construction & Configuration
The switchgear enclosure consists of precision-formed steel panels and structural components. Al-Zn coated steel or other specified material configurations can be selected according to project requirements and installation environments. The cabinet is divided into functional compartments to isolate main electrical assemblies and control components:
Busbar Compartment: Accommodates the main copper busbar system processed to specified current ratings and electrical arrangements. Supported by high-strength insulating components and installed per approved drawings.
Circuit Breaker Compartment: Houses the fixed-mounted vacuum circuit breaker, current transformers, and operating mechanisms, eliminating the need for a withdrawable breaker truck or primary sliding disconnect contacts.
Cable Compartment: Provides adequate space for cable termination and medium-voltage components, accommodating XLPE cable connections, surge arresters, and optional top or bottom cable entry.
Low-Voltage Compartment: Houses protection relays, energy meters, terminal blocks, auxiliary components, and control wiring, separated entirely from medium-voltage zones.
Internal Partitioning: Metal partitions separate main functional areas to prevent fault propagation and ensure operational safety.
Key Features
Fixed-Mounted Vacuum Circuit Breaker: The main circuit breaker is bolted in a fixed position, ensuring stable, long-term low circuit resistance without contact wear from sliding parts.
Compartmentalized Construction: Designated functional compartments separate busbars, circuit breakers, cables, and low-voltage controls.
Medium-Voltage Adaptability: Configurations support 12 kV and 24 kV systems based on specific network requirements.
Mechanical Interlocking: Robust interlocking functions coordinate the operational sequence between circuit breakers, earthing switches, and compartment access.
Flexible Cable Arrangement: Top or bottom cable entry routes coordinate smoothly with project layout plans.
Protection & Measurement Integration: Incorporates CTs, protection relays, meters, and auxiliary controls according to the intended electrical scheme.
Project-Specific Engineering: Dimensions, busbar layouts, and feeder arrangements are custom-coordinated based on approved engineering documents.
Technical Specifications & Engineering Downloads
|
Parameter |
Specification |
|
Product Type |
Fixed Type Metal-Enclosed Switchgear |
|
Rated Voltage |
12 kV / 24 kV |
|
Rated Frequency |
50 Hz / 60 Hz |
|
Rated Normal Current |
630 A / 1250 A / 2500 A |
|
Rated Short-Time Withstand Current |
20 kA / 25 kA / 31.5 kA (up to 3s depending on configuration) |
|
Rated Peak Withstand Current |
50 kA / 63 kA / 80 kA (depending on configuration) |
|
Main Switching Device |
Fixed-mounted vacuum circuit breaker |
|
Busbar Material |
Electrolytic copper (Conductivity >= 98% IACS) |
|
Internal Arc Classification |
IAC AFLR 25 kA / 1 s (where supported by test documentation) |
|
Enclosure Protection Degree |
IP4X (Main enclosure) / IP2X (Between specified compartments) |
|
Cable Entry Direction |
Top or bottom (configurable) |
|
Main Product Standard |
IEC 62271-200 |
|
Circuit Breaker Standard |
IEC 62271-100 |
Applications
Utility & Distribution Substations:
Integration into medium-voltage regional distribution grids for transformer feeders, incoming circuits, and line protection.
Commercial & Infrastructure Facilities:
Reliable power feed distribution for large commercial complexes, hospitals, and public infrastructure projects.
Industrial Power Distribution:
Main and sub-distribution systems in manufacturing plants, steel mills, and process facilities requiring high short-circuit ratings.
Renewable Energy Projects:
Collector and distribution substations for solar PV farms and onshore wind energy balance-of-plant systems.
Manufacturing, Quality Control & Compliance
Manufacturing covers sheet-metal fabrication, structural assembly, busbar processing, electrical component installation, and routine factory testing.
Sheet-Metal Fabrication: CNC laser cutting, punching, and bending processes maintain dimensional tolerances according to approved drawings.
Surface Treatment: Al-Zn coated steel and multi-stage chemical pre-treatment ensure corrosion resistance suitable for designated installation environments.
Busbar Processing: Copper busbars are cut, punched, bent, and plated according to approved electrical designs before installation.
Electrical Assembly: Vacuum circuit breakers, CTs, earthing switches, protection relays, and control wiring are integrated precisely per schematic diagrams.
Routine Factory Inspection: Completed assemblies undergo rigorous factory testing covering mechanical interlocking, operation checks, control wiring insulation, and electrical withstand voltage tests prior to packaging.
Quality Management: Manufactured strictly under ISO 9001 quality management systems, supported by verified type test documentation from accredited independent laboratories.
Customization & Project Support
Electrical Customization:
Tailored to match specified rated voltages, currents, short-circuit levels, feeder arrangements, protection relays, and metering packages.
Mechanical Adaptation:
Configured to fit designated cabinet dimensions, internal layouts, cable entry directions, and site installation constraints.
Comprehensive Submittal Support:
Engineering documentation packages include GA drawings, schematic wiring diagrams, equipment lists, and certified test records.
FAQ