Ensuring Reliability and Optimal Performance of Substation Assets
006Our Maintenance of Electrical Substations service ensures the safe, reliable, and efficient operation of critical power infrastructure throughout its lifecycle. By combining scheduled preventive maintenance, advanced condition-based monitoring, and responsive corrective interventions, we minimize the risk of failures and extend asset longevity.
The service includes:
Preventive Maintenance
(scheduled)
- Visual inspections: Check for corrosion, oil leaks, unusual noise, cracks in insulators.
- Cleaning: Dust, salt, or bird droppings can cause tracking and flashovers.
- Tightening connections: Prevent overheating and arcing at busbars, terminals, and grounding points.
- Testing protective relays: Ensuring protection systems (overcurrent, differential, distance relays) work correctly.
- Lubrication: Moving parts of disconnectors and circuit breakers.
Predictive Maintenance
(condition-based)
- Thermographic inspections (infrared cameras): Detect hot spots in connections and transformers.
- Oil analysis of power transformers: Dissolved gas analysis (DGA) reveals insulation aging or faults.
- Partial discharge (PD) testing: Identifies insulation defects in cables and switchgear.
- Online monitoring: SCADA systems track load, voltage, breaker operations, and alarms.
Corrective Maintenance
(unscheduled)
- Replacing failed fuses, surge arresters, or transformers.
- Repairing protection/control equipment after faults.
Maintenance Intervals
- Monthly/Quarterly: Visual checks, SCADA data review, thermography.
- Annually: Protection relay testing, transformer oil sampling, breaker mechanism tests.
- Every 3–5 years: Comprehensive transformer diagnostics, circuit breaker overhauls.
24/7 monitoring
Continuous 24/7 monitoring, year-round.
Ensuring immediate detection of anomalies and uninterrupted oversight of turbine performance.
Real-time fault management
Real-time fault detection and elimination.
Enabling rapid response and proactive intervention to minimize downtime and maintain stable performance.
Data Analysis & Optimization
Comprehensive data analysis and performance evaluation.
Transforming operational data into actionable insights for improved efficiency, reliability, and performance optimization.
Transparent Reporting
Transparent and up-to-date client reporting.
Ensuring clear visibility into performance, actions taken, and ongoing system status at all times.
Critical Equipment
we maintain
001
Power transformers:
Oil levels, bushings, tap changers.
002
Gas-insulated switchgear (GIS) or Air-insulated switchgear (AIS):
SF₆ gas monitoring (for
GIS), breaker mechanism tests.
003
Circuit breakers:
Timing tests, contact resistance checks.
004
Protection relays & SCADA systems:
Firmware updates, calibration.
005
Grounding system:
Measure soil resistance, inspect ground connections.
006
Auxiliary systems:
Auxiliary systems: Batteries, chargers, HVAC for control rooms.
why zephiros
we are Reliable and efficient
We combine deep domain experience with a service mindset to support your MV substation needs with clarity, consistency and reliability.
24/7/365
TECHNICAL SUPPORT ALL YEAR ROUND
Continuous monitoring & rapid response capability that ensures operational continuity for mission-critical MV substations.
27+
YEARS OF EXPERIENCE
Long-term involvement in complex wind farm and MV substation environments.
7+
PARTNERS IN 7 COUNTRIES
Expanding our activities across countries around the world.
experts
Your direct point of contact for MV substation maintenance