Protection and substation equipment need care after commissioning too. ENP provides technical support both case by case (troubleshooting after a trip or outage) and under periodic contracts, so faults are noticed early and downtime costs stay low.

Troubleshooting and fault analysis

Collecting disturbance records (COMTRADE format) and sequence of events (SOE) from relays
Reconstructing the event sequence and finding the cause: real fault, settings, trip circuit or CT/VT
Fault location on lines using distance relay data
Root cause report and recommended corrective actions
Relay retest and setting review after an incident

Periodic maintenance

Activity	Typical interval
Visual inspection and thermography	Annual or six-monthly
Protection relay testing	Every 2 to 4 years (digital relays)
Circuit breaker and contact resistance test	Every 2 to 4 years
Oil sampling and DGA	Annual
Battery and charger test	Six-monthly to annual
Earth resistance	Annual
Cable test (VLF / tan δ)	Every 3 to 5 years

Intervals are typical examples and are adjusted to substation criticality, environment and the operator's procedures.

Support contract (SLA)

Defined response time for incidents
Periodic visits per an annual plan
Recommended spare parts list
Equipment condition and trend reports

Retrofit and relay replacement

Replacing electromechanical or old relays with digital relays, including circuit review, new settings, rewiring, testing and commissioning without a long substation outage.

Training and consulting

Practical relay testing and setting training for operation teams
Equipment selection advice and tender technical specifications
Substation design review before execution

Scope of work

Disturbance record (COMTRADE) analysis and trip cause finding
Periodic inspection and maintenance on a plan
Support contract with defined response time (SLA)
Substation retrofit and old relay replacement
Operation team training
Equipment selection advice and design review

Technical Support & Consulting