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TGBT France

High-voltage substation


“We act for the continuity of your electricity distribution.”

At TGBT France, we possess expertise across various sectors (industrial, commercial, and all types of infrastructure) and offer a range of maintenance solutions to ensure reliable, secure, and high-performing electrical installations.

Explore our entire scope of maintenance activities, including transformer substations, medium-voltage cells and panels, low-voltage panels and cabinets for infrastructure, and more.

TGBT France offers maintenance levels I – II – III – IV according to NFC13-100, NFC13-200, and NFC15-100 standards, in compliance with decree n°88-1056 (NFC12-101).

Ensuring your safety through the maintenance of your installations.

Our maintenance service includes all of the following elements:

Protection cell
Capacitor bank
Main circuit breaker
Creation of a technical file
Free corrective interventions
Results commitment
Rapid troubleshooting
Transformer troubleshooting
High-voltage cell troubleshooting
Separation request at Enedis

Everything you need to know about our maintenance and servicing process for your high-voltage / low-voltage transformer substations.

High/Low Voltage Substation Room

  1. Check for presence of equipment and standardized safety signage
  2. Vacuum cleaning of floors, metal sheets, and ventilation grilles

Medium Voltage (MV) Compartment

We carry out maintenance on your MV compartments:

  1. Visual inspection of the entire compartment (overheating, emissions, oxidation…)
  2. Thorough interior and exterior cleaning
  3. Equipment condition check: insulators, bushings, control dampers, cable heads, and lubrication of the protective flap
  4. Tightening inspection of terminals, screws, and busbar connections using a torque wrench
  5. Restoration and adjustment of main contacts and spark arrestors
  6. Verification of alignment and simultaneity of slow closing contacts across various open devices
  7. Functionality check of mechanisms (linkages, controls, switches, SMALT…)
  8. Manual testing of mechanical trip and close system on fuse-link fuse
  9. Verification using current injection relay test set
  10. Pressure check and reconditioning of SF6 equipment

HVA circuit breaker control

We also take care of the maintenance of your circuit breaker. For this, our TGBT experts perform initial degreasing as well as various checks:

– Inspection of rollers and bearings
– Operational check (trip and close operation), including spring, stopper, and locking mechanisms
– Electrical inspection and wiring examination
– Battery charger inspection for backup power supply
– Tightening inspection of power and control contacts
– Oil level check in oil-insulated circuit breakers and lubrication of moving parts if necessary

    Transformer MV/LV

    Maintenance of MV/LV Transformers is one of our core expertise areas. Our technicians follow these steps:

    – Visual inspection of all equipment
    – Cleaning and dusting
    – Checking HV/LV and auxiliary connection points
    – Tightening inspection of terminals, screws, and busbars using a torque wrench
    – Buzz test
    – Checking for device sealing (tank, valves, terminals) and the condition of seals
    – Dielectric level check and refilling if necessary
    – Insulating component inspection
    – Taking a half-liter sample of dielectric fluid for PCB analysis and dielectric strength tests (excluding pyralene)
    – Safety device tests (DGPT2 or thermostat)
    – Checking security interlocks and LV coverings
    – Inspecting the condition of HV and LV cable terminations and silica gel, replacing if needed

    Once these steps are successfully completed, we proceed with re-energization and testing.

    LV circuit breaker

    • Comprehensive Inspection
    • General Cleaning and Dusting
    • Connection Point Verification
    • Tightening Inspection of Terminals, Screws, and Busbars
    • Checking Locking and Safety Devices
    • Inspection of Visible Disconnect or Cut-off Mechanisms
    • Contact State Verification and Maintenance, Mechanism Operation Check, Differential (for equipped circuit breakers) with a tester and relay check
    • Re-energization and Testing

    Capacitor Bank

    The management of maintenance for your capacitor banks involves an initial visual inspection of all equipment (overheating, emissions, oxidation…), followed by a general cleaning.

    Our experts then carry out a tightening inspection of terminals, screws, and busbars using a torque wrench.

    Numerous tests are conducted manually on each step, followed by a verification of the consumption of each capacitor.

    Other practical information about maintenance

    Following maintenance, our experts ensure the disposal of generated waste, check safety equipment, and issue a maintenance certificate for high-voltage substations to be presented to insurance companies.

    We provide safety posters and regulatory accessories in our vehicles, along with HPC fuses to prevent a second lockout due to replacement (manufacturer validity: 10 years).

    The energy required for our equipment is supplied by a generator. We also conduct dielectric oil analyses for transformers.

    Our interventions are carried out by our team of experts authorized according to UTE C18-510.

    Dielectric oil analysis of the transformer

    As part of the maintenance of your equipment, regular monitoring of the oil within your transformers is essential as the proper functioning of an electrical transformer depends on it!

    We offer you the following analyses:

    – Dissolved gas analysis per transformer
    – Dielectric strength analysis per transformer
    – PCB analysis per transformer
    – Furans analysis per transformer
    – Complete analysis package including: PCB, dielectric strength, dissolved gas, acidity, moisture content, colorimetry, appearance per transformer