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CrestWatt

Maintenance and fault response for operational plant.

CrestWatt maintains the electrical systems it commissions, and takes on operational plant built by others. Maintenance is delivered against a defined visit schedule with structured records, so that the asset owner can evidence compliance and track condition over time.

Standards and methods cited

  • BS 7671
  • ENA TS 41-24
  • Thermographic survey
  • HV authorised person
O&M technician carrying out a thermographic survey on operational electrical plant.

Planned preventive maintenance

  • HV switchgear inspection, contact resistance and operational checks
  • Transformer inspection, oil sampling and protection device function testing
  • Protection relay re-verification and settings audit against the current relay schedule
  • Thermographic survey of switchgear, transformer stations, combiner boxes and DC connectors under load
  • Earthing system continuity and electrode resistance re-testing
  • LV distribution periodic inspection and testing to BS 7671
  • String level performance verification and DC re-testing on a sample plan
  • Communications and SCADA link verification

Corrective maintenance and fault response

  • HV cable fault location by TDR and thumper, excavation coordination, joint repair and re-testing
  • DC string fault finding, connector replacement and re-certification
  • Protection and control fault diagnosis, relay replacement and re-commissioning
  • Inverter and transformer station electrical fault support to OEM procedure
  • Communications and fibre fault location, re-splicing and re-certification

Operational support

  • HV authorised person and senior authorised person cover for switching and permits
  • Annual condition reporting against the asset register
  • Support to asset managers on warranty claims and OEM interface

Contract forms

Fixed-term PPM contracts with defined visit schedules and reporting, call-off corrective maintenance, and combined commissioning plus first-year O&M for new plants.

Operations and Maintenance — common questions

What does planned preventive maintenance cover?

HV switchgear inspection and contact resistance, transformer inspection, oil sampling and protection device testing, protection relay re-verification against the current relay schedule, thermographic survey under load, earthing continuity and electrode resistance re-testing, LV periodic inspection to BS 7671, sample DC re-testing and communications verification.

Does CrestWatt maintain plant it did not build?

Yes. CrestWatt maintains the systems it commissions and takes on operational plant built by others, working from the asset register and the existing O&M schedule.

Is HV fault response available?

Yes. HV cable fault location by TDR and thumper with excavation coordination, joint repair and re-testing; DC string fault finding and connector replacement; protection and control fault diagnosis and re-commissioning; and fibre fault location, re-splicing and re-certification.

What contract forms are available?

Fixed-term PPM contracts with defined visit schedules and reporting, call-off corrective maintenance, and combined commissioning plus first-year O&M for new plants.

Terms used on this page

Full glossary →

Next step

Send the asset register and the current O&M schedule. We will propose a maintenance programme and a fixed annual price.

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