After an unexpected outage, the goal is not simply the fastest restart but a safe one. Protect people and the site, then give qualified responders accurate event information.
This guide is general information. HV/MV intervention and testing must be carried out by qualified personnel under the equipment manual and facility safety procedures.
Safety in the first minutes
If there is smoke, fire, leaking oil or unusual noise, prevent unauthorized access and follow the facility emergency procedure. Only authorized staff should perform switching or intervention. Never touch or approach equipment to confirm a suspected fault.
- Secure the area
- Follow the site's emergency procedure
- Record event time and visible symptoms
- Preserve relay and breaker logs
What to tell the technical team
Provide the location, transformer nameplate, tripped protection device, last maintenance date and available test history. A 24/7 phone line is a contact channel, not a promise of instant arrival; response and travel time are agreed after reviewing the case.
Safe return to service
The cause may lie in the transformer, switchgear, cable or protection chain. Inspection and selected tests guide the repair. Do not re-energize until relevant functions and safety conditions have been verified.
Prepare the facts for the first call
Share the precise facility location, authorized site contact, nameplate, tripped protection and visible hazards. Preserve relay events; images and time records taken from a safe position may assist diagnosis. A telephone assessment never replaces on-site safety verification. Arrival and work scope depend on location, access and team availability. Re-energization is planned only after the fault cause and required checks are assessed.
Decision checklist
- Keep people clear and control access
- Follow the facility emergency procedure
- Preserve relay, breaker and event records
- Give location and asset details to the qualified team
Related service
Emergency Transformer and MV Response →
Request technical support →Frequently asked questions
Does a 24/7 line mean immediate on-site arrival?
No. The phone line is available around the clock; on-site response is arranged case by case.
Should power be restored immediately after a trip?
Not before the cause and necessary checks are addressed.
Does a 24/7 phone line mean immediate site arrival?
No. The line supports initial assessment; the field plan and arrival time are agreed separately.
