High voltage installations - electrical design above 10 kV

Electrical design at medium and high voltage levels demands specialist knowledge, familiarity with international standards and a detailed understanding of network operators' technical requirements. Our scope covers everything from plant design, grid connections and component selection through to specification, testing and commissioning of complete high voltage installations.

NIRAS as your consultancy partner

Working with NIRAS gives you a consultancy partner who:

• understands complex high voltage systems and their interfaces
• ensures optimal sizing and component selection
• manages technical requirements from network operators and authorities
• delivers solutions that are robust, future-proof and documented to applicable standards

What does electrical design above 10 kV cover?

We design complete electrical systems, including cable sizing, switchgear, transformers, protection equipment, earthing systems and short-circuit protection. NIRAS prepares detailed technical specifications for high voltage equipment, so the solution is documented and compatible with the existing grid.

Technical specifications for high voltage equipment

Power transformers (10 to 150 kV)

Technical specifications for power transformers at the relevant voltage levels.

Switchgear

Specification of switchgear with a focus on operational reliability and interface management.

High voltage cables, joints and terminations

Design and specification of HV cables, joints and terminations in accordance with applicable requirements and standards.

Reactors, capacitor banks and filter solutions

Specification of equipment for regulation and harmonic filtering where relevant.

Protection and monitoring systems

Specification of protection and monitoring systems, including relay and control functions.

Technical aspects we document in the design

Short-circuit currents and fault levels

Determination and documentation of short-circuit conditions as the basis for sizing and safe operation.

Selectivity and protection coordination

Coordination of protection and selectivity, so that faults are handled correctly and their consequences limited.

Power quality

Assessment of power quality as part of the overall robustness of the installation.

Harmonic filtering

Assessment of harmonic conditions and the need for filtering where relevant.

Stability and compatibility with the existing grid

Documentation of stability and compatibility, so the solution operates correctly alongside the existing grid.

Tendering, procurement and contract management

We handle the full process, from technical specifications and tender documents through to evaluation, contract award and supplier management.

Hvad er elektrisk design over 10 kV?

Elektrisk design over 10 kV omfatter projektering, dimensionering og teknisk specificering af højspændingsanlæg og -systemer. Arbejdet inkluderer valg og dimensionering af primære og sekundære komponenter, beskyttelses- og kontrolsystemer samt grænseflader til elnettet. Der stilles særligt høje krav til driftssikkerhed, personsikkerhed og anlæggets tilgængelighed, ligesom designet skal leve op til gældende nationale og internationale standarder. En central del af opgaven er desuden udarbejdelse af entydig, konsistent og sporbar teknisk dokumentation, som understøtter både myndighedsgodkendelse, idriftsættelse, drift og vedligehold.

Hvilke komponenter indgår typisk i et højspændingsanlæg?

Et højspændingsanlæg kan omfatte kabler, koblingsanlæg (switchgear), transformere, beskyttelsesudstyr, jordingssystemer og relaterede grænseflader, afhængigt af anlæggets formål og gældende nettilslutningskrav.

Hvordan arbejder I med netselskabernes tekniske krav?

Vi indarbejder netselskabernes tekniske krav og relevante standarder i design og kravspecifikationer, så løsningen bliver dokumenteret og robust.

Hvad betyder selektivitet i beskyttelse?

Selektivitet er et grundlæggende princip i elektriske beskyttelsessystemer, hvor beskyttelsesfunktioner på forskellige niveauer er tids- og/eller strømkoordineret. Formålet er, at fejl frakobles så tæt på fejlkilden som muligt for at minimere udkoblet effekt, reducere driftsforstyrrelser og opretholde forsyningssikkerheden i resten af anlægget.

Kan I hjælpe med udbud og leverandørstyring?

Ja. Vi kan udarbejde kravspecifikationer og udbudsmateriale samt støtte evaluering, kontraktindgåelse og leverandørstyring.