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Transient state thermal circuit model-based method and device for determining permissible current of overhead conductor

A transient thermal circuit model and overhead wire technology, which is applied in measurement devices, measurement of current/voltage, measurement of electrical variables, etc., can solve the problems of complex calculation, low reliability of results, and high cost of measurement input.

Active Publication Date: 2012-07-18
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +1
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Problems solved by technology

However, the existing method for determining the maximum allowable current needs to measure parameters and consider too many factors, such as wind speed, air density, wire diameter, effective incident angle of sunlight, etc., which make the measurement investment cost high, the calculation complicated, and the reliability of the result unreliable. high

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  • Transient state thermal circuit model-based method and device for determining permissible current of overhead conductor
  • Transient state thermal circuit model-based method and device for determining permissible current of overhead conductor
  • Transient state thermal circuit model-based method and device for determining permissible current of overhead conductor

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Embodiment Construction

[0040] In order to realize the purpose of simplifying the calculation, the inventor first constructed a transient thermal circuit model of the overhead wire, and thus deduced the formula of the maximum allowable current. The present invention is explained in detail below starting from model building.

[0041] From the heat balance equation of the wire, it can be known that the heat absorbed by the wire includes the heating of the wire itself, heat absorption by sunlight, and the heat dissipation includes convective heat transfer and heat radiation. Based on the one-to-one correspondence between the voltage, resistance, and capacitance in the electric field and the temperature difference, thermal resistance, and heat capacity in the thermal circuit, the corresponding thermal circuit model can be established with the wire as the core.

[0042] When only the surface temperature T1 of the wire is monitored, the physical model of the wire is as follows figure 1 As shown, the physi...

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Abstract

The invention discloses a transient state thermal circuit model-based method and device for determining a permissible current of an overhead conductor. The method comprises the steps of: firstly, loading a current to the overhead conductor, measuring the temperature of the conductor and an environment temperature of an environment where the conductor is in in real time; if wanting to know the maximum permissible current at some moment, calculating an AC resistance; by adopting a special formula, sequentially calculating the AC resistance and an environment thermal resistance of a moment to be detected, and the maximum permissible current when the temperature of the conductor reaches 70 DEG C under the outside environment of the moment to be detected; and comparing the current current and the maximum permissible current to carry out corresponding compatibility on the overhead conductor, and providing basis for load transfer, scheduling plan and the like, wherein the formula for calculating the environment thermal resistance and the maximum permissible current is based on a transient state thermal circuit model, the maximum permissible current can be obtained through measuring the temperature of the conductor and the environment temperature of the environment where the conductor is in and through simple calculation, and proved by experiments, result errors are in a permissible range.

Description

technical field [0001] The invention relates to the technical field of high-voltage overhead power transmission, in particular to a method and device for determining the allowable current of overhead wires based on a transient thermal circuit model. Background technique [0002] When there is no current passing through the conductor, its temperature is equal to the temperature of the surrounding medium; when the current passes, the resistance converts electrical energy into heat energy, and the temperature of the conductor is higher than the ambient temperature, coupled with the influence of convective heat transfer, heat radiation and sunlight, etc., it is in a dynamic state. in the process of change. When the load on the transmission line continues to increase, the line will have overheating faults. In order to prevent this phenomenon from happening, the concept of the maximum allowable current has emerged. [0003] my country's "110-500kV Overhead Power Transmission Line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 张鸣刘刚阮班义
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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