Complete Range of Power Equipment
From generation to last-mile distribution — every product engineered to IEC, IS, and IEEE standards, manufactured in-house, and type-tested at CPRI-accredited laboratories.
Power Transformers
High-capacity oil-immersed transformers for transmission and grid applications
NSM Power Transformers are oil-immersed, naturally or forced-cooled units designed for transmission and sub-transmission applications. Built to IEC 60076 and IS 2026, they are available in ONAN, ONAF, OFAF, and ODAF cooling configurations. Each unit is custom-engineered to client specifications and type-tested at CPRI.
Key Features
- Custom-engineered to client load flow and short-circuit studies
- OLTC with AVR for voltage regulation in grid applications
- Buchholz relay, PRD, WTI, OTI, MOG standard protection fittings
- Radiator-type or corrugated fin tank construction
- Nitrogen blanketing option for sealed conservator designs
- Factory acceptance testing per IEC 60076-1 routine test schedule
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Capacity Range | 1 MVA – 100 MVA |
| Voltage Class | Up to 220 kV |
| Cooling | ONAN / ONAF / OFAF / ODAF |
| Vector Group | Dyn11, YNyn0, YNd11, Yd11 |
| Frequency | 50 Hz |
| Insulation Class | Class A (Mineral Oil) |
| Tap Changer | OLTC / OCTC |
| Losses | As per IS / IEC Star-1 / Star-2 |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
Distribution Transformers
Oil-immersed distribution transformers for utility and industrial feeders
NSM Distribution Transformers serve utility distribution networks and industrial step-down applications. Manufactured to IS 1180 and IEC 60076-1, they are available in three-phase and single-phase configurations with CRGO or amorphous core options for reduced no-load losses.
Key Features
- Amorphous core option for up to 70% reduction in no-load losses
- Hermetically sealed and conservator-type designs available
- Off-circuit tap changer ±2×2.5% standard
- Corrugated fin tank for compact footprint
- Anti-theft hardware and tamper-proof terminal covers
- Suitable for outdoor installation up to 2000 m altitude
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Capacity Range | 16 kVA – 5000 kVA |
| HV Voltage | Up to 33 kV |
| LV Voltage | 433 V / 11 kV |
| Core Material | CRGO / Amorphous |
| Vector Group | Dyn11 / YNyn0 |
| Cooling | ONAN |
| Mounting | Plinth / Pole / Pad |
| Loss Level | IS 1180 Part-1 / Star-1 / Star-2 |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
Dry-Type / Cast Resin Transformers
Fire-safe, maintenance-free transformers for indoor and sensitive environments
NSM Dry-Type Transformers use vacuum pressure impregnated (VPI) or cast resin (CRT) insulation systems, making them ideal for indoor installations where oil-filled equipment is prohibited. Suitable for hospitals, data centres, high-rise buildings, and offshore platforms.
Key Features
- No oil — zero fire risk, suitable for occupied buildings
- Maintenance-free operation with no oil sampling or filtration
- Integrated temperature monitoring with PT100 sensors
- Forced-air cooling fans for cyclic overload capacity
- Enclosure options from IP00 to IP31 for dusty environments
- Suitable for harmonic-rich loads (K-factor rated)
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Capacity Range | 25 kVA – 10 MVA |
| HV Voltage | Up to 36 kV |
| LV Voltage | 433 V – 11 kV |
| Insulation System | VPI / Cast Resin (CRT) |
| Insulation Class | Class F (155°C) / Class H (180°C) |
| Cooling | AN / AF |
| Enclosure | IP00 / IP21 / IP23 / IP31 |
| Fire Behaviour | F1 (self-extinguishing) |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
Medium Voltage Switchgear
VCB, SF6, and RMU panels for 11 kV to 36 kV distribution networks
NSM MV Switchgear panels are designed for primary and secondary distribution at 11 kV, 22 kV, and 33 kV. Available in vacuum circuit breaker (VCB), SF6 gas-insulated, and ring main unit (RMU) configurations for indoor and outdoor installations.
Key Features
- Draw-out VCB with truck mechanism for safe maintenance
- Arc flash protection with pressure relief flaps
- Numerical protection relays (SEL, ABB, Siemens, Schneider)
- Interlocking schemes — mechanical and electrical
- SCADA-ready with IEC 61850 GOOSE messaging option
- Anti-condensation heaters and IP4X internal segregation
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Voltage Class | 11 kV / 22 kV / 33 kV / 36 kV |
| Rated Current | Up to 2500 A |
| Short-Circuit Rating | Up to 40 kA / 3 sec |
| Interrupting Medium | Vacuum / SF6 |
| Busbar System | Single / Double Busbar |
| Protection | Numerical / Electromechanical Relays |
| Metering | CT / PT / Energy Meter |
| Installation | Indoor / Outdoor (GIS) |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
LV Switchboards & Motor Control Centres
Main distribution boards, MCCs, and PFC panels up to 6300 A
NSM LV Switchboards cover the full range of low-voltage distribution — from main LV panels (MLVPs) and sub-distribution boards (SDBs) to motor control centres (MCCs) and automatic power factor correction (APFC) panels. Designed to IEC 61439 and IS 8623.
Key Features
- Type-tested assembly (TTA) per IEC 61439-2
- Fully withdrawable or fixed feeder modules
- Integrated APFC relay with capacitor duty contactors
- Bus coupler and bus section arrangements for N+1 redundancy
- Energy metering with Modbus / BACnet communication
- Powder-coated RAL 7032 / custom colour options
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Rated Voltage | 415 V / 440 V AC |
| Rated Current | Up to 6300 A |
| Short-Circuit Rating | Up to 85 kA (1 sec) |
| Busbar Material | Copper / Aluminium |
| Incomer | ACB / MCCB / Fuse Switch |
| Outgoing | MCCB / MCB / RCCB / Fuse |
| Enclosure | IP41 / IP54 / IP65 |
| Form of Separation | Form 1 to Form 4b |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
Control & Relay Panels
Protection, metering, and SCADA-ready control panels for substations
NSM Control and Relay Panels provide complete protection and control solutions for HV/MV substations and industrial power systems. Panels are engineered with numerical protection relays, mimic diagrams, and IEC 61850 communication capability for integration with SCADA and DCS systems.
Key Features
- Numerical protection relays with event logging and disturbance recording
- IEC 61850 GOOSE and MMS for substation automation
- Integrated DC distribution with battery charger and DCDB
- Mimic diagram with LED indication for switchgear status
- Factory Acceptance Testing (FAT) with secondary injection
- As-built drawings and relay setting calculations supplied
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Panel Type | Simplex / Duplex / Marshalling |
| Protection Relays | SEL / ABB / Siemens / Schneider |
| Communication | IEC 61850 / Modbus / DNP3 |
| DC Supply | 110 V DC / 220 V DC |
| Mimic Diagram | Engraved / LED Mimic |
| Enclosure | IP42 / IP54 |
| Wiring | Ferruled, colour-coded per IEC |
| Testing | FAT at works + SAT at site |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
Bus Ducts & Rising Mains
Sandwich and non-segregated bus ducts for high-current power distribution
NSM Bus Ducts provide a compact, safe alternative to cable trays for high-current distribution in industrial plants and commercial buildings. Available in sandwich (isolated phase), non-segregated, and segregated phase configurations in aluminium or copper conductors.
Key Features
- Plug-in tap-off boxes at any point along the run
- Flexible joints for thermal expansion and building movement
- Fire-rated enclosures for riser shafts (2-hour fire rating)
- Low inductance sandwich design for reduced voltage drop
- Pre-fabricated sections for fast site installation
- Suitable for outdoor installation with IP65 enclosure
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Current Rating | 800 A – 6300 A |
| Voltage Rating | 415 V / 11 kV |
| Conductor Material | Aluminium / Copper |
| Type | Sandwich / Non-segregated / Segregated |
| Short-Circuit Rating | Up to 85 kA (1 sec) |
| Enclosure | Aluminium / GI Sheet |
| IP Rating | IP54 / IP65 |
| Installation | Horizontal / Vertical / Riser |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
Capacitor Banks & APFC Panels
Automatic power factor correction systems for industrial and utility networks
NSM Capacitor Banks and APFC Panels improve power factor, reduce reactive power penalties, and release system capacity. Available in fixed, switched, and automatic configurations for LV and MV networks, with detuned reactor options for harmonic-rich environments.
Key Features
- Detuned reactor banks for safe operation in harmonic environments
- Microprocessor-based APFC relay with 12-step switching
- Capacitor duty contactors with pre-charge resistors
- Harmonic analysis and filter design service available
- MV capacitor banks with VCB switching for 11 kV / 33 kV
- Payback calculation and energy audit support provided
Typical Applications
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Voltage | 415 V LV / 11 kV – 33 kV MV |
| KVAR Range | 10 KVAR – 10 MVAR |
| Control | Automatic (APFC Relay) / Manual |
| Switching | Capacitor Duty Contactor / VCB |
| Reactor Tuning | 5.67% / 7% / 14% detuned |
| Target PF | 0.95 – 0.99 lagging |
| Discharge | Discharge resistors standard |
| Enclosure | IP42 / IP54 / Outdoor IP55 |
Specifications shown are standard ranges. Custom ratings available on request — contact our engineering team with your project requirements.
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