GCS Low-Voltage Draw-Out Switchgear

Description

GCS low-voltage draw-out switchgear is designed for 50/60 Hz distribution systems rated at 380/400/660 V and up to 4,000 A. It is used for power distribution, motor control center (MCC) applications, and reactive-power compensation.

1. Product Overview and Applications
   • Product Positioning: GCS is a proven low-voltage draw-out switchgear platform for applications requiring high reliability, safety, automation, and frequent maintenance access.
   • Applications: Power plants, substations, oil and gas, chemicals, metallurgy, textiles, high-rise buildings, commercial complexes, data centers, hospitals, and industrial facilities.

2. Core Structural Features

• Modular Design: A combined 8MF or KS frame with 20 mm modular spacing provides high mechanical strength, flexible assembly, component interchangeability, and easy expansion.
• Compartmentalized Construction: Separate horizontal-busbar, functional-unit/drawer, and cable compartments use galvanized steel or high-strength flame-retardant barriers to contain faults and reduce arc propagation.
• Drawer System: Drawer heights are based on a 160 mm module in 1/2, 1, 1.5, 2, and 3-unit sizes. Standardized width and depth provide full interchangeability, while rotary racking and mechanical interlocks control connected, test, isolated, and withdrawn positions.
• Busbar System: Rear-mounted horizontal busbars and L-shaped vertical copper busbars embedded in flame-retardant supports provide high dynamic and thermal stability, with 50-80 kA short-time and 105-176 kA peak withstand ratings.
• Protection Rating: IP30 or IP40 for dust and contact protection in demanding industrial environments.

3. Core Advantages

• Serviceability: Hot-standby drawer replacement allows a single circuit to be serviced without interrupting the entire cabinet, minimizing recovery time.
• Enhanced Safety: Three fully separated compartments contain faults. Mechanical interlocks prevent breaker closing unless the drawer is in the connected or test position and prevent drawer movement while the breaker is closed.
• Efficient Space Utilization: A typical 800 mm cabinet depth accommodates up to eleven 1-unit drawers or twenty-two 1/2-unit drawers per cabinet.
• Flexible Expansion: Standardized components and top/bottom cable-entry combinations simplify procurement and project-specific configuration.

4. Main Technical Specifications

• Rated Voltage: Main circuit AC 380/400/660 V; auxiliary circuit AC 220/380 V or DC 110/220 V.
• Rated Current: Horizontal busbar <=4,000 A; vertical busbar 1,000 A.
• Rated Frequency: 50/60 Hz.
• Insulation Voltage: AC 660/1,000 V.

5. Main Functions

• Power Distribution: Main low-voltage distribution and power conversion.
• Motor Control: Centralized motor control, protection, and monitoring as an MCC.
• Reactive-Power Compensation: Works with capacitor banks to improve power factor and reduce reactive losses.