Input data
Allocated and required capacity, connection point, continuity category, cadastral data, loads, operating modes and future development.
POWER-DISTRIBUTION INFRASTRUCTURE · LV / MV
Cable lines, overhead lines and substations with clearly separated engineering scopes.
We separate distribution infrastructure into five distinct services: LV cable lines, MV cable lines, packaged substations, MV overhead lines and LV overhead lines. Each service can include assessment, calculations, design, coordination, construction, testing and commissioning.
Shared engineering basis
Every installation is defined by its operating duty, route and grid-connection conditions.
Voltage, conductor or cable, transformer, protection and construction method are selected for the actual site rather than from a generic configuration.
Electrical studies
Current capacity, voltage drop and losses, short circuits, thermal withstand, selectivity, protection, grounding and power quality.
Route and structural solution
Terrain, crossings, easements, access, mechanical loads, foundations, poles, cable infrastructure, clearances and construction method.
Separate services
Five infrastructure types with a defined purpose and activity scope.
01
Low-voltage cable lines — 0.4 kV to 1 kV
Underground or exposed LV cable systems distributing electricity between substations, main and distribution boards, industrial, public, residential and energy facilities.
- Route, easement and crossing studies
- Cable sizing for current, voltage drop, short circuit and installation method
- Design of trenches, ducts, chambers, channels, protection and grounding
- Supply, laying, jointing, labelling, measurements, protocols and as-built records
02
Medium-voltage cable lines — above 1 kV to 35 kV
MV cable connections for substations, PV, ESS, industrial capacity, switchgear and other energy facilities.
- Connection-point and topology assessment
- Cable, cross-section, screen, accessory and screen-bonding selection
- Routes, crossings, easements, terminations and joints
- Laying, installation, phasing, testing, protection setup and commissioning records
03
Packaged substations — 20/0.4, 20/0.6 and 20/0.8 kV
Packaged or concrete packaged substations converting 20 kV to 0.4, 0.6 or 0.8 kV according to the loads, technology and connected power converters.
- Transformer rating, quantity, reserve and operating-mode definition
- MV switchgear, transformer, LV main board, auxiliary supply and cable design
- Protection, metering, automation, remote communications and interlocks
- Civil works, foundation, grounding, supply, installation, testing and commissioning
04
Medium-voltage overhead lines — up to 35 kV
MV overhead networks using bare or covered conductors for grid links, branches and connection of substations and energy facilities.
- Route profile, easement, crossing and access studies
- Electrical and mechanical calculations for conductors, spans, sag and loads
- Pole, insulator, fitting, disconnector and surge-protection selection
- Foundations, construction, grounding, tests, protocols and as-built records
05
Low-voltage overhead lines — up to 1 kV
LV overhead distribution, typically using aerial bundled conductors, for consumers, street lighting and local networks.
- Sizing for demand, voltage drop, short circuit and permitted length
- Conductor, pole, bracket, fitting, branch and connection-box selection
- Mechanical checks, clearances, crossings, protection, grounding and repeated grounding
- Construction, connection, measurement, protocols and handover
Completed work
Engineering solutions delivered on site.
The selected photographs show actual project stages and completed Power Design Engineering systems. Each image is included for its clear technical relevance and execution detail.
01 / LV
Electrical boards and protection
Distribution, protection and control boards for photovoltaic and electrical-power systems.
02 / MV/LV
Substations and power infrastructure
Packaged equipment and infrastructure for grid connection, transformation and distribution.
Complete lifecycle
From technical concept to reliable operation.
For each of the five services, we can provide the complete scope or selected stages: survey and feasibility, connection alternatives, detailed design, geodetic and coordinated disciplines, bills of quantities, approval support, supply, construction, testing, commissioning, as-built documentation and contract-based maintenance. The required test protocols are prepared following inspections.
Technical enquiry
Information for an initial engineering assessment.
Missing information can be established through a site survey, measurements and coordination with the relevant operators and authorities.
- 01Installation type — LV cable, MV cable, substation, MV overhead line or LV overhead line
- 02Site location and use
- 03Required and DSO-allocated capacity
- 04Voltage, connection point and connection conditions
- 05Approximate length and route start/end points
- 06Available cadastral data, opinions, agreements and approvals
- 07Loads, transformers, switchgear, boards and protection
- 08Available drawings, single-line diagrams, photographs and technical documents
Frequently asked questions
Key questions about cables, overhead lines and substations.
01What is the difference between LV and MV cable lines?+
LV cable lines operate up to 1 kV and typically supply end users and boards. MV cable lines operate above 1 kV and up to 35 kV, connecting substations, switchgear, generation and energy facilities.
02When is a packaged substation required?+
A substation is used when the site connects at medium voltage and conversion to the operating low voltage is required. Type, rating and configuration depend on the grid conditions, loads, operating mode and reserve.
03Why are 0.4, 0.6 and 0.8 kV secondary voltages listed?+
0.4 kV is standard for general LV loads. 0.6 and 0.8 kV are used for specific industrial or energy solutions, including certain large converters. The final voltage follows the equipment and connection conditions.
04What is included in an overhead-line design?+
Route and profile, electrical and mechanical calculations, conductor, pole, insulator and fitting selection, foundations, grounding, protection, crossings, easements, specifications and the required approvals.
05Can you provide design only or construction only?+
Yes. The scope may be full engineering or an individual stage: assessment, design, coordination, supply, construction, testing, commissioning or maintenance, depending on available documentation and customer responsibilities.
06How are tests documented?+
Inspections and measurements are recorded in the applicable protocols. Construction projects also receive as-built drawings, technical records and handover and commissioning documentation.