Medium Voltage Switchgear
1. Metal-Clad Compartmental Construction: Grounded metal barriers separate major primary circuit components to support safe operation and maintenance.
2. Draw-Out Vacuum Circuit Breakers: Vacuum interruption and draw-out construction provide reliable switching, isolation and service access.
3. Project-Specific Protection and Control: Protective relays, CTs, VTs, metering, communication and control schemes are engineered to the approved single-line diagram.
4. Flexible Indoor or Outdoor Configurations: Lineups can be configured for utility, industrial, infrastructure and renewable-energy applications.
5. Standards-Based Designs: IEEE/ANSI or IEC configurations are available when specified and within the applicable design and test scope.
Product Details
Medium-Voltage Metal-Clad Switchgear
This medium-voltage switchgear is engineered for the switching, protection, control and isolation of distribution circuits in utility, industrial, infrastructure and renewable-energy applications. Each lineup is configured around the project single-line diagram, system voltage, available fault current, protection philosophy and installation environment.
Typical Configuration Range
• Maximum Voltage Classes: 4.76 kV, 8.25 kV, 15 kV, 27 kV and 38 kV
• Continuous Current: Typically 600–4,000 A, depending on voltage class and design
• Short-Circuit Rating: Typically 16–63 kA, subject to the approved configuration
• Circuit Breaker: Draw-out vacuum circuit breaker
• Bus: Copper or aluminum, with insulation and plating selected for the application
• Construction: Indoor or outdoor metal-clad lineup
• Accessibility: Front-access or front-and-rear-access arrangements
• Control Power: AC or DC control-power configurations
• Frequency: 50 or 60 Hz
Protection, Metering and Control Options
• Microprocessor-based protective relays
• Current transformers and voltage transformers
• Revenue or utility metering provisions
• Arc-flash detection and high-speed protection schemes
• SCADA, communication and remote-control interfaces
• Automatic transfer, bus differential and feeder-protection schemes
• Space heaters, lighting, receptacles and environmental controls for outdoor enclosures
Standards and Testing
IEEE/ANSI metal-clad configurations are available for applicable requirements of IEEE C37.20.2. Circuit breakers and switching duties are coordinated with applicable IEEE C37 series requirements. Arc-resistant construction is available only when specifically designed, tested and documented to IEEE C37.20.7. IEC configurations may be engineered to IEC 62271-200 when specified.
Final voltage class, BIL, continuous current, short-circuit rating, breaker duty, bus rating, enclosure type and protection scheme are established through project-specific engineering and confirmed on approved drawings and test documentation.
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