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Simple method for calculating short-term maximum allowable overload current of submarine electric power cable

A submarine power cable, the maximum allowable technology, applied in the field of overload current calculation, can solve the problems of complicated formula, complex calculation process, many parameters, etc., to achieve the effect of simple calculation process, high reliability, and less parameters required for calculation

Active Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +3
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Problems solved by technology

The calculation methods of the existing short-term maximum allowable overload current of submarine cables are all carried out with reference to this standard, which requires many parameters, cumbersome formulas, complicated calculation process, and it is difficult to give more accurate results in a short time

Method used

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  • Simple method for calculating short-term maximum allowable overload current of submarine electric power cable
  • Simple method for calculating short-term maximum allowable overload current of submarine electric power cable
  • Simple method for calculating short-term maximum allowable overload current of submarine electric power cable

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Embodiment Construction

[0019] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] Such as figure 2 Shown, the steps of the present invention are:

[0021] 1) Obtain environmental parameters, including ambient temperature θ 0 , Soil thermal resistivity T of submarine cable landing section 4 ;

[0022] 2) Obtain the structural parameters and electrical parameters of the submarine cable body. The structural parameters of the submarine cable body include the thermal resistance coefficient T of the cable insulation layer, inner lining layer, and outer layer 1 , T 2 , T 3 , the electrical parameters include wire loss per meter of cable per phase core W c , The dielectric loss W of each phase core of the cable per meter i , cable metal sheath loss coefficient λ 1 and armor loss factor λ 2 ;

[0023] 3) Obtain the initial current value I of the submarine cable through online monitoring 1 ;

[0024] 4) ...

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Abstract

The invention discloses a simple method for calculating the short-term maximum allowable overload current of a submarine electric power cable, and relates to an overload current calculating method. An existing method of calculating the short-term maximum allowable overload current of a cable refers to standards, needs plenty of parameters and complex formulas, is complex in calculation process, and can hardly provide an accurate result within a short period of time. The method includes the following steps of obtaining environment parameters, obtaining structural parameters and electrical parameters of a submarine cable body, obtaining an initial current value I1 of the submarine cable through online monitoring, calculating the initial temperature of a conductor according to the IEC 60287 standard formula, obtaining the short-term overload time tm according to an overhaul or schedule instruction, and calculating the maximum allowable overload current I2 within the short-term overload time tm through the formula (please see the formula in the specification) when the short-term overload time tm is smaller than set time. According to the technical scheme, few parameters are required for calculation, and the calculation process is easy, convenient and rapid. The shorter the overload time of the submarine cable is, the higher the reliability of the calculation result is.

Description

technical field [0001] The invention relates to an overload current calculation method, in particular to a simple algorithm for the short-term maximum allowable overload current of a submarine power cable. Background technique [0002] The temperature of the conductor during the operation of the submarine cable is the basis for determining whether the submarine cable reaches the current carrying capacity. However, each layer inside the submarine cable has a certain heat capacity, and the response speed of the conductor temperature lags behind the loss change speed seriously. In practice, submarine cables are rarely operated under constant load for long periods of time. It is more important to know the growth rate of the cable temperature after loading, and the time to reach the steady state temperature under constant load. Submarine cables have an emergency overload capacity that exceeds the allowable steady-state current carrying capacity for a short time. The United Stat...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 宣耀伟俞恩科迟永宁张磊陈国志郑新龙张占奎乐彦杰李琰胡凯
Owner STATE GRID CORP OF CHINA
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