Oil-filled cable terminal oil level measuring and oil supplementing method

An oil-filled cable and terminal technology, which is applied in the field of oil level measurement and oil replenishment at the oil-filled cable terminal, can solve the problems of inconvenience, inability to accurately judge the oil quantity of the terminal, and inability to provide basis for maintenance plan formulation, so as to eliminate defects and facilitate operation the effect of the situation

Inactive Publication Date: 2015-06-03
STATE GRID CORP OF CHINA +1
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Problems solved by technology

As for the oil-filled cable terminal, at present, it is only possible to check whether there is any leakage of insulating oil during the inspection process, but it is impossible to m

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  • Oil-filled cable terminal oil level measuring and oil supplementing method

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with specific implementation methods;

[0019] A method for oil level measurement and oil replenishment at an oil-filled cable terminal, such as figure 1 shown, including the following steps:

[0020] Step 1: Install a three-way valve at the oil filling port at the end of the oil-filled cable.

[0021] In this step, after the oil-filled cable terminal is installed and filled with oil normally, install a three-way valve at the oil injection hole of the oil-filled cable terminal. When the oil-filled cable terminal is in normal operation, the three-way valve is in the closed state.

[0022] Step 2: Measure the pressure P generated by the insulating oil inside the oil-filled cable terminal.

[0023] When it is necessary to measure the oil level inside the oil-filled cable terminal, first connect the three-way valve to the external pressure sensor, and then open the three-way valve to measure the pressur...

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Abstract

The invention relates to an oil-filled cable terminal oil level measuring and oil supplementing method. The method is mainly characterized by comprising the following steps of (1) mounting a three-way valve on an oil filling port of an oil-filled cable terminal, wherein the three-way valve is closed when the oil-filled cable terminal runs normally; (2) measuring the intensity of pressure (P) generated by insulating oil in the oil-filled cable terminal; (3) measuring the temperature (T) of the insulating oil in the oil-filled cable terminal and calculating out the density (rho) of the insulating oil; (4) calculating the liquid level h of the insulating oil in the oil-filled cable terminal; and (5) filling the oil-filled cable terminal with oil if the liquid level h of the insulating oil in the oil-filled cable terminal does not meet the operating requirement. The method is reasonable in design; the measurement of the liquid level of the insulating oil in the oil-filled cable terminal is realized, and meanwhile, the oil is supplemented when the insufficient oil quantity is found, so operators can know the operating situation accurately and eliminate defects in time.

Description

technical field [0001] The invention belongs to the technical field of high-voltage oil-filled cables, in particular to a method for measuring and replenishing oil at an oil-filled cable terminal. Background technique [0002] Among the existing types of power cable terminals, oil-filled cable terminals are widely used in various engineering projects. The oil-filled cable terminal uses insulating oil to control the internal field strength of the terminal. Due to the good physical and chemical properties and insulation performance of the insulating oil, it is currently widely used in the power grid. Insulating oil is an insulating medium, so ensuring sufficient oil is an important prerequisite to ensure good insulation. As for the oil-filled cable terminal, at present, it is only possible to check whether there is any leakage of insulating oil during the inspection process, but it is impossible to make an accurate judgment on the remaining oil in the terminal. Therefore, it ...

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Application Information

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IPC IPC(8): G01F23/14H02G15/22
Inventor 李旭刘宝成唐庆华满玉岩郗晓光张弛
Owner STATE GRID CORP OF CHINA
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