Why Substation Maintenance Matters
Substation equipment often runs for decades with little attention until something fails. A failed breaker, transformer or battery can cause long outages, costly emergency repairs and serious hazards to workers. Most of these failures show warning signs long before they occur, if the right tests are performed and understood.
Maintenance expectations are also rising. NFPA 70B is now a standard rather than a recommended practice, and owners are moving from fixed time-based schedules to condition-based maintenance driven by test data. Many maintenance teams are losing experienced staff and need new personnel to become productive quickly.
This course connects test procedures with sound maintenance decisions. You will learn which tests to perform, what normal and abnormal results look like, and when to repair, monitor or replace equipment.
Learning Outcomes
By the end of this course, you will be able to:
- Identify substation types, major components and the hazards of substation maintenance work
- Apply NFPA 70B and ANSI/NETA MTS to set maintenance tasks and intervals
- Inspect and maintain disconnect switches, interlocks and motor operators
- Test oil, vacuum and SF6 circuit breakers using insulation resistance, contact resistance, power factor and timing tests
- Inspect switchgear insulation, connections and torque, and apply thermography and partial discharge checks
- Perform and interpret transformer winding resistance, turns ratio, power factor and excitation tests
- Sample insulating oil and interpret oil quality tests and dissolved gas analysis
- Test CT and VT ratio, polarity and excitation characteristics
- Measure ground grid and earth resistance and recognize unsafe step and touch potentials
- Maintain and test station batteries and chargers, and support relay maintenance under NERC PRC-005
You will leave able to plan maintenance, interpret test results and make confident repair, monitor or replace decisions.
Course Objectives
- Build a practical understanding of how to maintain and test each major piece of substation equipment
- Help participants interpret test data, not just collect it
- Support the move from time-based to condition-based maintenance
- Reduce unplanned outages, equipment failures and maintenance-related hazards
Course Approach
The course is vendor-neutral and based on real maintenance practice in utility and industrial substations. Each module ties equipment construction and failure modes to the tests that detect them.
Worked examples use actual test results, including breaker timing traces, transformer power factor data, DGA results and ground test readings. Live polls and discussion keep participants engaged and let the instructor focus on the equipment your team maintains.
Related Training and Resources
To enhance your understanding of electrical infrastructure, see our related courses and guides: