Assessment method of running temperature of GIL in pipe rack

Abstract

The invention provides an assessment method of running temperature of a GIL in a pipe rack. The method comprises the following steps that a GIL physical model is built, the initial power loss of a shell is calculated, the quantity of heat convection and heat radiation between the shell and air is calculated, and the quantity of heat convection and heat radiation between a conductor and the shell is calculated. The temperature at which the GIL stably runs is assessed and calculated through an MATLAB calculation procedure of heat characteristics of the extra-high-voltage GIL in the pipe rack byusing correlated characteristic parameters of the GIL in an initial operating condition, wherein the MATLAB calculation procedure is designed in an MATLAB environment of a Windows operating system. Bymeans of the method, the stable running temperature of the extra-high-voltage GIL in the pipe rack can be assessed and calculated under different initial operating conditions. The method is high in assessment and calculation speed, high in precision and capable of being embedded into a GIL temperature monitoring system, and an important significance is provided for improvement of the GIL heat reliability.

Description

technical field [0001] The invention relates to the fields of UHV electrical transmission, thermal characteristics of gas insulated transmission lines (GIL), thermal reliability of long-distance UHV GIL equipment, etc., and in particular relates to a method for evaluating the operating temperature of GIL in a tunnel. Background technique [0002] Gas-insulated transmission line (GIL) is a long-distance transmission device using gas as the insulating medium. Compared with traditional cable transmission, it has the advantages of large capacity, low loss, and long service life. Common GIL faults such as discharge and insulator breakdown are accompanied by abnormal conductor or shell temperature. Not only that, if the temperature of the GIL busbar is too high, the busbar vault will occur, and even the basin insulator will break, and the waterproof glue of the basin will crack and other failures. The research on the thermal characteristics of GIL is of great significance to impr...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the existing finite element numerical simulation calculation method cannot quickly obtain the GIL operating temperature in the gallery tube, and cannot be embedded as a subroutine in the GIL temperature real-time monitoring system, thereby proposing a GIL operation in the gallery tube The temperature evaluation method, using the analytical method to solve the thermal characteristics of GIL, not only can quickly solve the problem of GIL thermal characteristics, but also can be embedded in the GIL temperature monitoring system as a subroutine

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