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Cable ampacity refers to the amount of current through which a cable line transmits electrical energy, and under thermally stable conditions, the cable ampacity when the cable conductor reaches the long-term allowable operating temperature is called the cable long-term allowable ampacity
.
The actual ampacity of power cables is not easy to determine due to
factors such as laying methods, operating conditions and the surrounding environment.
The current carrying capacity of the cable is large, which will cause the working temperature of the cable core to exceed the allowable value, and the life of the insulation will be shortened than expected; If the ampacity is small, the copper or aluminum of the cable core cannot be fully utilized, resulting in unnecessary cost rise and waste of resources
.
With the further development of wind power generation technology, wind turbines are increasingly used in more harsh environments (high cold, high radiation, high corrosion, high altitude and other environments), and changes in environmental conditions will inevitably affect the current
carrying capacity of power cables.
A scientific and accurate calculation of the current carrying capacity of the power cable can not only ensure the safe and reliable operation of the electrical system of the wind turbine, but also save costs
.
At present, the determination of the ampacity of power cables in the wind power industry is mainly based on theoretical calculation methods, and fully considers the influence of
practical application environmental factors.
The theoretical calculation is mainly based on IEC standards, and the International Electrotechnical Commission (IEC) standard is based on McGrath's paper in 1957, combined with the algorithm improvement of ampacity after 1957, and proposed the cable rated ampacity (100% load factor) calculation standard IEC60287 in 1982 (the corresponding domestic standard is JB/T10181-2000).
At present, most of the cable products and their ampacity in various countries have moved closer to IEC
.
The following figure shows the standard ampacity values of several single-core rubber insulated cables commonly used in the wind power industry according to this standard:
Cable ampacity refers to the amount of current through which a cable line transmits electrical energy, and under thermally stable conditions, the cable ampacity when the cable conductor reaches the long-term allowable operating temperature is called the cable long-term allowable ampacity
.
The actual ampacity of power cables is not easy to determine due to
factors such as laying methods, operating conditions and the surrounding environment.
The current carrying capacity of the cable is large, which will cause the working temperature of the cable core to exceed the allowable value, and the life of the insulation will be shortened than expected; If the ampacity is small, the copper or aluminum of the cable core cannot be fully utilized, resulting in unnecessary cost rise and waste of resources
.
With the further development of wind power generation technology, wind turbines are increasingly used in more harsh environments (high cold, high radiation, high corrosion, high altitude and other environments), and changes in environmental conditions will inevitably affect the current
carrying capacity of power cables.
A scientific and accurate calculation of the current carrying capacity of the power cable can not only ensure the safe and reliable operation of the electrical system of the wind turbine, but also save costs
.
At present, the determination of the ampacity of power cables in the wind power industry is mainly based on theoretical calculation methods, and fully considers the influence of
practical application environmental factors.
The theoretical calculation is mainly based on IEC standards, and the International Electrotechnical Commission (IEC) standard is based on McGrath's paper in 1957, combined with the algorithm improvement of ampacity after 1957, and proposed the cable rated ampacity (100% load factor) calculation standard IEC60287 in 1982 (the corresponding domestic standard is JB/T10181-2000).
At present, most of the cable products and their ampacity in various countries have moved closer to IEC
.
The following figure shows the standard ampacity values of several single-core rubber insulated cables commonly used in the wind power industry according to this standard:
