MV Switchgear
MV Switchgear
Indoor air-insulated medium-voltage switchgear up to 36 kV — vacuum circuit breaker based, withdrawable truck construction, with metal-clad / metal-enclosed cubicles to IEC 62271-200.
Cubicle construction
Metal-clad and metal-enclosed designs with segregated busbar, circuit breaker and cable compartments. Sheet-steel construction with bolted modular assembly, earthed metallic partitions between functional units, and inter-cubicle isolation as required by the application.
- Withdrawable truck construction with service / test / disconnected positions
- Mechanical and electrical interlocks against unsafe operation
- Earthing switch with making capacity for cable and busbar earthing
- Pressure-relief flaps directing arc gases away from operator front
Vacuum circuit breaker
Vacuum interrupters operated by stored-energy spring mechanism with motor charging, trip and close coils. Long mechanical and electrical life with maintenance-free interrupters across the rated operating cycle.
Protection & control
Numerical relay-based protection with configurable software for over-current, earth-fault, differential, distance and bus-bar protection schemes — coordinated with upstream and downstream devices and integrated with substation SCADA where required.
- IEC 61850 ready protection IEDs (where specified)
- Configurable LCD-HMI on cubicle for status, metering and alarms
- Anti-pumping, trip-circuit supervision and breaker-fail logic
Type-tested designs
Designs supported by type-test certificates from accredited laboratories (CPRI / equivalent) for short-circuit, temperature rise, and dielectric performance. Internal arc classification available against IEC 62271-200 where opted by the customer.
Typical Ratings
- Rated voltageup to 36 kV
- Rated currentup to 4000 A
- Short-circuitup to 40 kA / 3 s
- Lightning impulse75–170 kV (BIL)
- Frequency50 Hz
Standards
- IEC 62271-1 (general)
- IEC 62271-100 (HV CBs)
- IEC 62271-200 (AC metal-enclosed)
- IEC 62271-102 (earthing switches)
- IS / IEC equivalents
Typical Applications
- Power generation step-up bays
- Industrial primary distribution
- Cement, steel, refinery captive plants
- Data-centre incoming HT
- Utility substations & PCC
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