Should we choose GIS or AIS switchgear?
GIS needs the least floor area and is sealed against dust and humidity. AIS and metal-clad designs suit rooms with space for clearances and routine access. The choice follows space, environment and budget.
Products we supply
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.
01Overview
Supply and engineering from one team
Powersense supplies power transformers from 2,500 to 63,000 kVA, distribution transformers from 10 to 2,500 kVA, dry-type transformers up to 630 kVA, MV switchgear and concrete kiosks, and engineers the connection: rating, fault level, protection and earthing.
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02Scope and process
Engineering scope and deliverables
- 01
Connection terms and load profile
Grid operator requirements, maximum demand, growth allowance and voltage level are collected and documented.
DeliverableConnection data sheet - 02
Transformer rating
Power rating, vector group, impedance, losses and cooling are selected under IEC 60076-1, and the unit is checked for short-circuit withstand.
DeliverableTransformer specification - 03
Switchgear technology
GIS, AIS or metal-clad switchgear to IEC 62271-200 is selected with vacuum or SF6 breakers (IEC 62271-100), rated for the busbar fault level.
DeliverableSwitchgear specification, single-line diagram - 04
Protection and earthing
Relay settings, fuses, instrument transformers and the earthing system are designed for installations above 1 kV (IEC 61936-1, EN 50522).
DeliverableProtection settings, earthing design - 05
Substation layout
Room or kiosk dimensions, ventilation, cable entries and clearances are defined, with prefabricated substations to IEC 62271-202 where used.
DeliverableLayout drawing, foundation requirements - 06
Factory tests and energisation
Routine tests are witnessed or reviewed, and delivery, installation and commissioning checks are completed before energisation.
DeliverableTest reports, commissioning record
03Standards
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 60076-1Power transformers: general requirements, ratings, temperature rise and tests.
- IEC 60076-11Dry-type power transformers: requirements and tests.
- IEC 62271-200AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to 52 kV.
- IEC 62271-100High-voltage alternating-current circuit-breakers.
- IEC 62271-202High-voltage/low-voltage prefabricated substations.
- IEC 61936-1Power installations exceeding 1 kV AC: common rules for design and erection.
04Products
Products we supply
- Power transformers, 2,500 to 63,000 kVA
- Distribution transformers, 10 to 2,500 kVA
- Dry-type transformers up to 630 kVA
- GIS, AIS and metal-clad MV switchgear
- Vacuum and SF6 breakers, fuses and disconnectors
- Concrete kiosks and measuring transformers
05Project types
Typical project types
- Substations and utility connections
- Industrial plants
- Large commercial developments
- Renewable-energy connections
- Hospitals and data centres
- Infrastructure and campuses
06Technical notes
Technical notes and FAQ
Why choose a dry-type transformer?
A dry-type unit contains no liquid dielectric, which suits indoor sites and buildings with stricter fire-safety requirements. In our range, dry-type transformers are available up to 630 kVA.
07Keep exploring
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