How is a transformer rated?
From the maximum demand with allowance for growth, the load profile, vector group, impedance, losses and the grid operator's terms. The choice is then checked against the fault level of the network.
Electrical
Electrical Panels & Power Distribution
Transformers, switchgear, panels, busbars, cables, generators and UPS: the complete power chain, engineered, supplied and commissioned by one team.
01Overview
Supply and engineering from one team
The electrical department covers the power chain from the grid connection to the final circuit. Powersense supplies each element and engineers the whole: network study, protection coordination, panel design and verified installation.
Request a quote →02We supply
Equipment for the whole power chain
Seven product groups, each rated for the fault level, load and environment of the project.
Low-Voltage Switchgear & Protection
Circuit breakers, contactors, motor starters, power-factor correction and metering, selected as one coordinated low-voltage protection system.
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Medium-Voltage Switchgear & Transformers
Power and distribution transformers, MV switchgear and prefabricated substations, rated for load, fault level and the grid operator's connection terms.
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Busbar Trunking Systems
Copper and aluminium busbar trunking for feeders, rising mains and plug-in distribution, rated for current, fault level and future growth.
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Power, Control & Data Cables
Power, control, signal and data cables specified by current, route, environment and reaction to fire.
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Cable Trays & Cable Management
Galvanised cable trays, ladders and accessories, sized for cable weight, fill and support spacing.
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Generator Sets & Standby Power
Diesel, gas, gasoline, marine and solar generator sets with transfer and synchronisation panels, sized for the load that starts, not only the load that runs.
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UPS Systems, Rectifiers & Solar Inverters
UPS systems, rectifiers and solar inverters sized for the critical load, the required autonomy and the connection point.
View details →03We engineer
Engineering around the equipment
Studies, panel manufacturing and installation, so the delivered equipment works as designed.
Electrical Project Planning & Design
Concept, basic and detailed electrical design supported by calculations, studies and specifications, with the specified equipment supplied by Powersense.
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Low-Voltage Switchboards & Control Panels
Low-voltage switchboards and control panels, designed and verified to IEC 61439, built and wired by Powersense with the devices supplied.
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Turnkey Electrical Contracting
Turnkey installation of power, low-current and automation systems, with equipment supplied, verified to IEC 60364-6 and handed over with full documentation.
View details →04Delivery process
From requirements to handover
- 01
Network study
Load flow and short-circuit currents are calculated to IEC 60909 at every busbar, which fixes the ratings of all downstream equipment.
DeliverableNetwork study report - 02
Grid connection and transformer rating
The transformer is rated from maximum demand, growth, losses and the grid operator's connection terms under IEC 60076-1.
DeliverableConnection data sheet, transformer specification - 03
Protection coordination
MV relays and LV breakers are coordinated so that only the device nearest to a fault trips (IEC 60947-2 for LV devices).
DeliverableCoordination curves, settings list - 04
Distribution design
Busbars, cables and trays are sized for current, voltage drop and fault withstand, and assemblies are verified to IEC 61439.
DeliverableCable and busbar schedules - 05
Backup power
Generators and UPS are sized for the critical load, starting currents and autonomy, and connected through transfer or synchronisation panels.
DeliverableBackup power sizing note, transfer logic - 06
Testing and handover
Insulation, earthing and protection tests are completed to IEC 60364-6 and the as-built documents are issued.
DeliverableTest records, as-built documents
05Standards
International standards applied
These standards form the technical basis for design and equipment selection. The exact set is confirmed for each project against the national regulations in force.
- IEC 60909-0Short-circuit currents in three-phase AC systems: calculation of initial, peak and breaking currents.
- IEC 60076-1Power transformers: general requirements, ratings, temperature rise and tests.
- IEC 62271-200AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to 52 kV.
- IEC 60947-2Low-voltage circuit-breakers: ratings, breaking capacity, tripping characteristics and selectivity.
- IEC 61439-1Low-voltage switchgear and controlgear assemblies: general rules and design verification.
- ISO 8528-1Reciprocating internal combustion engine driven generating sets: application, ratings and performance.
06Project types
Typical project types
- Substations and utility connections
- Industrial plants
- Large commercial developments
- Hospitals and hotels
- Data centres
- Renewable-energy connections
07Technical notes
Technical notes and FAQ
Why does selectivity matter?
Only the device closest to a fault should trip. Discrimination limits of the breakers are checked against the fault levels of the network study, so that one faulty circuit does not shut down the building.
