High Voltage and Low Voltage Distribution Services
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Power Testing is a leading specialist in high voltage and low voltage distribution services, including switchgear maintenance, installation, commissioning, repairs, cable installation, condition monitoring and trend analysis. Power Testing offers an unrivalled service within the electrical engineering and contracting industry.
We pride ourselves on solving client problems and are known throughout the industry for our immediate reactive emergency services. This, coupled with our excellent project management and planned works management services, makes us an excellent partner in servicing your electrical distribution system and ensuring your electrical supply.
Installation services for distribution networks
Power Testing carries out all types of installation works associated with distribution networks, from package substation installation feed pillar changes, control cabling and relay works through to the provision of high-voltage ring-main systems and private networks, grid transformers, network cabling and earthing / lightning protection.
Upon completion of all the installation works, we also undertake all necessary commissioning testing prior to energisation.
Maintenance services for electrical distribution equipment
Power Testing has tailored its maintenance reports to ensure all key parts are inspected and recorded. Our report sheets have been designed to meet and exceed manufacturers' recommendations for carrying out electrical maintenance in accordance with BS 6626. All reports are entered onto our computer database and stored so that previous reports can be viewed within seconds.
We have staff trained and conversant with equipment ranging from distribution boards up to 132kV circuit breakers, and maintain a library of manufacturers' information regarding electrical distribution equipment. Many modification and repair circulars issued by manufacturers to our clients are passed on to us, as it is usually Power Testing that will carry out any modifications or checks detailed in such circulars.
Frequency response analysis for transformers
Frequency response analysis (FRA) is a non-destructive, diagnostic test used to verify the condition of the active part in a transformer (windings and core), by comparison with reference data from the same unit or results from similar units. The goal of FRA is to test if physical changes in the active part of the transformer have occurred after a particular event (e.g. refurbishment, repair, accident, etc.).
Authorised persons for high / low voltage system operation
Power Testing employs fully trained authorised persons who carry out all duties relating to the safe operation and running of our clients' high voltage / low voltage systems / networks. These duties range from a full on-site presence to daily requirements.
For clients with private networks we offer a senior authorised person call-out facility with a response time of between two to four hours. Our SAPs will attend site and assist in determining the cause of failure and restoration of supply.
Cable fault location service
Buried cables can, at any time, be subject to damage. Damage sustained may not cause the cable to fail immediately – some cables have lasted a number of years after being damaged – while some cables may fail without having been damaged.
When a cable fails someone, somewhere loses their electrical supply. We can provide a cable fault location service that includes:
- Taking full control of electrical safety
- Pinpointing the position of the fault
- Repair of the cable
- Testing of the repaired cable and return to service
- Reinstatement of the ground service
Inspection services for electrical distribution equipment
Power Testing carries out regular substation inspections for many of its existing clients. This work consists of inspections of the tripping batteries and charger, visual inspection of all substation equipment, checking of the building security, testing of transformer insulating oil samples, and, where fitted, replacement of transformer desiccants.
These inspections are designed to complement our preventative maintenance programme by highlighting potential problems.
Hazardous area equipment inspection
Power Testing has extensive experience carrying out visual, close and detailed inspection of hazardous area equipment. These inspections are designed to complement our preventative maintenance programme by highlighting potential problems. A fully computerised records and reporting system is used for inspection activities.
Our full-time dedicated team of inspectors specialises in the inspection of electrical power equipment installations with emphasis on BSEN 60079 (electrical equipment in hazardous areas).
Testing services for electrical distribution equipment
Power Testing offers a full commissioning service. This facility is complemented by our range of other testing services available, which include the following:
- Cable fault location
- Pressure testing equipment and cables both using AC and DC test sets
- Protection testing - both primary and secondary
- Earth installation testing - in accordance with BS 7430 (without disconnection)
- Power factor correction equipment testing and installation
Available White Papers
Supporting the World with Electrical Solutions and Resources The solution to prevent power outages: General industry awareness is that STR/ST relays are known to fail due to low loadings resulting in unwanted, costly power outages.