Custom Medium Voltage Switchgear: Engineering, Options, and Delivery

Custom Medium Voltage Switchgear: Engineering, Options, and Delivery

Introduction

Custom MV switchgear is often required when standard catalogs do not fit site constraints, protection needs, or integration requirements. A clear specification and staged engineering process reduce risk.

Engineering Options

• Form factor: Indoor/outdoor, aisle depth, rear/front access, cable top/bottom entry.
• Ratings: Voltage/BIL, short-time kA, bus current, and altitude corrections.
• Arc safety: Arc-resistant construction, arc detection relays, pressure relief ducting, remote racking.
• Protection/controls: Numerical relays with IEC 61850/GOOSE, Modbus, or DNP3; fast transfer schemes; breaker failure logic.
• Auxiliaries: Space heaters, anti-condensation, CT/VT class selection, metering, and PQ.

Workflow from Spec to Delivery

1. Data gathering: One-line, fault levels, grounding method, environmental conditions, and layout constraints.
2. Preliminary design: Cell arrangement, breaker types, CT/VT ratios, relay I/O mapping.
3. Protection study: Coordination, arc-flash study, and relay settings proposal.
4. Drawings and approvals: GA, schematics, cable schedules, and interlock diagrams for review.
5. Factory acceptance test: Witness tests for dielectric, contact resistance, functional checks, and relay schemes.
6. Logistics and commissioning: Shipping, lifting plans, SAT, and on-site training.

Quality and Compliance

• Compliance with IEC 62271-200 or ANSI C37.20.2; request type-test evidence.
• Routine tests per standard; documentation of FAT and SAT results.
• Traceability for breakers, CT/VT, and relays; spares list.

Applications

• Critical facilities needing custom footprints or retrofits.
• Industrial plants integrating specialized protection (e.g., transformer differential, bus differential, motor protection).
• Utilities and renewables requiring specific communication and SCADA schemes.

Why Choose Enwei Electric

Enwei Electric engineers custom MV switchgear with vacuum breakers, configurable layouts, and full relay suites. Arc-resistant options, remote operation, and 61850 integration support modern safety and automation goals. Explore Enwei MV switchgear for tailored solutions.

Conclusion

Custom MV switchgear succeeds when ratings, protection, and layout are defined early and verified through FAT/SAT. Partner with Enwei Electric to align engineering, testing, and delivery with your site requirements.

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