Power engineering

We provide services for transmission and distribution system operators. We have many years of experience in providing support services for high and medium voltage network operating crews.

Construction of an overhead line using an aircraft

Construction of an overhead line using an aircraft

    List of services offered:

  • patrolling and diagnostics of power lines
  • visual inspection
  • thermovision
  • examination of corona discharge
  • recording and laser scanning of the power lines
  • Creating and updating Geographic Information System (GIS)
  • support the acceptance of maintenance services and renovations (e.g. painting)
  • support the construction of new power lines
  • support companies provides live working services
  • „emergency” services

VISUAL INSPECTION OF POWER LINES

We offer one of the annual periodic visual inspection of the power line from the air i.e. from helicopter flying with an average speed of 40-50 km/h by qualified observer which records remarks on specially designed aerial work inspection cards or record route of power line by airborne B-cam Information about damage of the power line demanding immediate intervention is transferred to or from the helicopter during the flight or after the flight.

Visual inspection of the periodic line include:

  • the overall view of the power lines
  • assessment of the chains, insulators with equipment, cables, spacers, silencers, structural columns
  • assessment of the stocking level
  • assessment of the areas and segments at risk (important crossroads, areas affected by mining damages, bird migration routes, etc.)
  • location of the properties on the power line route

Disaster recovery inspection of power line includes:

  • Inspection of a specific segment of the line to determine the causes of the automatic shut-down of line and determine the type of failure

We carry out a visual inspection of the line from the helicopter flying at average speed (to the segment of line) 180 km / h and the average working speed 40 – 50 km / h over the inspected by observer segment with the recording of the cause of the failure on the video tape through the B-cam camera installed on helicopter.

Inspections are carry out as the unit reports such needs, without the previously prepared schedule.
The observer determines precisely the cause and location of the failure and suggests a way to removing the cause of the failure, B-cam tape is an additional documentation of the location and type of failure.

THERMOVISIONAL CHECK OF POWER LINE

Thermography (thermal mapping surface of the object under study) is a modern technique for identifying locations of overheating of electrical components during work.
The helicopter is equipped with a thermal imaging system. It is the latest generation device for long-range observation with the ability to overlay the GPS coordinates, gimbal position.

The apparatus includes a specialized computer system that allows on-screen view of the results and allows to digitally record the image on a magnetic medium. The media capabilities allow to save single images every 1/5 seconds for 2 hours. Geographically coordinates are assigned to each image, which guarantees a fast and error-free correct location of recorded material.

The thermovision measurement allows control of the current connections of the extractors on the power transmission poles and inter-span joints. The assessment of the connection status is made by comparing the measured temperature increments of the connected cable with reference values (depending on: air temperature, surface emissivity, cable cross-section, current load) relative to the permissible long-term load. With this method it is possible to locate places with a temperature difference of up to 0.1 ° C. In order to ensure profitability of the operation, the line control is carried out at a load of at least 50% of the rated current of the line.

The key benefits of using thermovision are:

  • Shorter time and lower downtime costs
  • Cheaper operation and maintenance of the line
  • Lower costs of power line inspections
  • diagnostics during full-load of line and increasing safety of work.

EXAMINATION OF CORONA DISCHARGE

This is one of the effective and simple diagnostic systems using the phenomenon of corona. As it is known, the high voltage between the lines and the ground leads to the so-called “partial discharge – jump of electric sparks, not developing into full discharge. This phenomenon called corona is the cause of

  • energy waste
  • noise
  • radio interference
  • release of small amounts of ozone and nitrogen oxides
  • Used so far the analog device record the phenomenon on the route of the line. This year a new type of camera recording the phenomenon was presented.

    These devices can detect:

    • Damage to working cables (cracks, etc.)
    • The clearance on the connections (not tightened spacers, loops on insulator connections, etc.)
    • Insulator damage

    The list above does not include all the opportunities offered by helicopters for this industry, so we invite you to contact AIRCOM and we encourage you to cooperate in order optimization services.

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