Vision Cable Analysis

Cable and surroundings

Vision Cable Analysis calculates the temperature of cables and their environment, taking into account the environment and possible external heat sources.

Cable editor

Vision Cable Analysis comes with an extensive database of the most commonly used cables. Users can easily modify cables and define additional cable models.

IEC 60287

The IEC 60287 standard describes the methods for calculating cable losses and the thermal resistance of the cable and its environment.

Functionality

Vision Cable Analysis calculates:

• Maximum current rating for multiple circuits of single and three core cables
• Temperature of all cables at each selected amperage
• Temperature of the surrounding soil
• Sensitivity analysis

The results of the calculations are presented graphically, with any change or adjustment immediately visible.

IEC 60853

De IEC 60853 standard describes the methods for calculating of de cyclic cable rating and the emergency cable rating.

The dynamic cable rating calculation is based on the fact that a cable, not conducting 100% of the maximum continuous current, has not reached its maximum temperature. Thanks to the dynamic properties of cable and soil, the temperatures respond slowly to a step change in current, enabling the operator to overload the cable during a short time in emergency situations.

Functionality

Vision Cable Analysis calculates:

• Cyclic rating (a full week daily 24-hour cycles)
• Emergency rating
• Step response

These calculations show how much more than the continuous current rating the cables can conduct in case of a cyclic varying load. The cyclic rating depends on the shape of the daily load cycle. These calculations also show how many extra loads can be added to the cable in case of emergencies. The emergency current rating strongly depends on the starting temperature and the emergency duration.

The starting point of Vision Cable Analysis calculations is always the construction of the cable. The program works with all common single- and three-core cables using the known insulation and construction materials.

Each cable type can be inspected in detail and edited in the cable editor. With this cable editor the standard supplied cable database can easily be adapted and expanded.

Underground and above-ground

Vision Cable Analysis can calculate the ampacity for underground and aboveground cables. The program lets you easily adjust the conditions of the cable connections.

For underground cables, depth and position are the most important factors. Nearby heat sources can be added.

Vision Cable Analysis calculates the cable current rating for those cases:

• the soil does not dry out,
• the soil partially dries out (two-zone approximate physical model) and drying-out of the soil is to be avoided.