Keeping the Flow Stable
Professional MV Substation Maintenance.
Why cleaning matters:
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.
Critical equipment we maintain:
Power transformers
Oil levels, bushings, tap changers.
Gas-insulated switchgear (GIS) or Air-insulated switchgear (AIS)
SF gas monitoring (for GIS), breaker mechanism tests.
Circuit breakers
Timing tests, contact resistance checks.
Protection relays & SCADA systems
Firmware updates, calibration.
Grounding system
Measure soil resistance, inspect ground connections.
Auxiliary systems
Batteries, chargers, HVAC for control rooms.
MAINTENANCE INTERVALS
Defined Maintenance Frequencies:
001
Monthly/Quarterly:
Visual checks, SCADA data review, thermography.
002
Annually:
Protection relay testing, transformer oil sampling, breaker mechanism tests.
003
Every 3–5 years:
Comprehensive transformer diagnostics, circuit breaker overhauls.
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