PREFAFRANCE, a French specialist in prefabricated high-voltage (HTA/LV) substations, designs, manufactures and installs solutions compliant with French and European regulatory requirements. Each substation is engineered and manufactured in accordance with applicable decrees, orders and standards, ensuring safety, reliability and legal compliance for operators and owners of electrical installations.
1. Regulatory Framework and Legal Obligations
Owners of HTA substations are subject to strict obligations defined by the Labour Code, national decrees and technical standards applicable to electricity distribution. These texts govern the construction, operation, maintenance and safety of electrical substations connected to the public network.
Key Reference Texts
- Decree No. 2015-1084 of 27 August 2015: defines the conditions for connection to the public network and specifies the owner’s obligations during installation and operation of the HTA substation.
- Order of 17 May 2001: specifies technical requirements for design, operation, maintenance and safety of substations connected to the public distribution network.
- Labour Code (Articles R4226-1 to R4226-21 & R4544-6): requires regular maintenance, periodic verification by authorised professionals, and strict application of safety instructions for all interventions.
- NF C 13-100, NF C 13-200 Standards: set rules for design, operation and maintenance of HTA/LV substations, including obligations to update electrical diagrams and report anomalies.
2. Owner Responsibilities
- Maintain installation compliance with rules in force at the date of commissioning.
- Ensure regular maintenance and monitoring of equipment by qualified technicians.
- Guarantee permanent accessibility of the substation for network managers and emergency services.
- Comply with easement agreements for land crossed by electrical networks.
Any compliance failure may engage the civil and criminal liability of the owner, particularly in the event of an incident endangering persons or property.
3. PREFAFRANCE Commitment: Compliance and Safety
PREFAFRANCE designs and manufactures its prefabricated substations by integrating regulatory and normative requirements from the design stage:
- Full compliance with NF C 13-100, NF C 13-200, NF EN 61330, HN 64-S-52 and IEC 62271-202 standards.
- Systematic quality control in the workshop before dispatch.
- Sealing, dielectric and mechanical resistance tests.
- Technical documentation and certificates of conformity provided with each delivery.
4. Potential Failures and Prevention
Failures in a high-voltage substation mainly concern transformers, switchgear, insulation systems and earthing.
Common Failure Examples
- Short circuit: overcurrent due to accidental contact.
- Insulation fault: current leakage or internal arcing.
- Overheating / overload: deterioration of the transformer or insulating oil.
- Protection failure: non-functional circuit breakers or relays.
- SF6 or oil leaks: loss of insulation and environmental risk.
- Fire or explosion: often linked to a short circuit or overload.
Prevention
- Preventive maintenance plans adapted to operating conditions.
- Periodic insulation and earthing checks.
- Oil and dissolved gas analysis for early fault detection.
- Technical training for operators.
5. Installation of PREFAFRANCE Prefabricated HV Substations
The installation of a prefabricated HTA/LV substation must be carried out according to a precise technical procedure, validated by the network manager and applicable standards.
Main Steps
- Site preparation: excavations, foundations, earth loops and equipotential bonding.
- Delivery and handling: carried out by approved specialists (weight up to 30 tonnes).
- Positioning of the substation on the planned slab or base.
- HTA and LV electrical connections, installation of auxiliaries and safety devices.
- Earthing and final tests: insulation checks, functional tests and validation by self-inspection report.
6. Standards and Key Points
Applicable Standards
- NF C 13-200: safety distances, ventilation, fire protection.
- NF C 17-300: requirements for prefabricated substations (fire resistance, dielectric recovery).
- HN 64-S-52: technical prescriptions for installed equipment.
Essential Points
- Coordination between the manufacturer, network manager and end client.
- Natural or forced ventilation sized according to transformer power.
- Firebreak devices and safety interconnections for industrial sites.
7. Conclusion
Regulatory compliance of HTA substations is not optional — it is a legal obligation and a safety guarantee. Thanks to its expertise in reinforced concrete, prefabrication and electrical engineering, PREFAFRANCE offers operators turnkey solutions that are compliant, reliable and durable, meeting the strictest requirements of the French and European markets.
PREFAFRANCE: your partner for compliant, safe and lasting high-voltage substations.
