Power cable ampacity

Engineers are often called upon to calculate ampacity and temperature rise of power cable installations to help increase system reliability and support the proper use of installed equipment.

Eaton's CYME CYMCAP software is for performing ampacity and temperature rise calculations for power cable installations. Determining the maximum current power cables can sustain without deterioration of any of their electrical properties is important for the design of electrical installations. It addresses steady-state and transient thermal cable rating as per the analytical techniques described by Neher-McGrath and the International Standards IEC 287 and IEC 853. This software was developed jointly by Ontario Hydro (Hydro One), McMaster University and Eaton (CYME International), under the auspices of the Canadian Electricity Association. The validation of the results obtained with the CYMCAP software provides for increased confidence when upgrading existing power cable installations and designing new ones, thus maximising the benefits from the considerable capital investment associated with them.

Power cable ampacity software

Analytical capabilities

Iterative techniques based on Neher-McGrath and IEC-287 methods
Full compliance with North American practice and compliance with IEC standards, IEC 60287, IEC 60228, IEC 60853, etc.
Detailed graphical representation of virtually any type of power cable. This functionality can be used to modify existing cables data and enrich the cable library with new ones. This includes single-core, three-core, belted, pipe-type, submarine, sheathed and armoured cables
Different cable installation conditions such as directly buried, thermal backfill, underground ducts or duct banks
Pipe-type cables directly buried or in thermal backfill
Independent libraries and databases for cables, duct-banks, load curves, heat sources and installations
Modelling of cables in air on riser poles, groups of cables in air, moisture migration, nearby heat sources and heat sinks, etc.
Different cable types within one installation
Non-isothermal earth surface modelling
Cyclic loading patterns as per IEC-60853, including soil dry-out
Multiple cables per phase with accurate modelling of the sheath mutual inductance which greatly influences circulating current losses and thus de-rates the ampacity of cables
All types of sheath bonding arrangements for flat and triangular formations are supported with explicit modelling of minor section lengths, unequal cable spacing, etc.

Transient analysis

Ampacity given time and temperature
Temperature analysis given time and ampacity
Time to reach a given temperature, given the ampacity
Ampacity and temperature analysis as a function of time
User-defined load profiles per circuit
Multiple cables per installation
Circuits can be loaded simultaneously or one at a time

Eaton’s CYME CYMCAP software calculates ampacity and temperature rise calculations for power cable installations .

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Need product support?

CYME user portal: my.cyme.com

P: 450 461 3655 or 800 361 3627 (Canada and USA)

E: cymesupport@eaton.com

Questions before you buy

E: cymeinfo@eaton.com

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Power cable ampacity