A method for detecting the grounding condition of the sheath end of a submarine cable withstand voltage test
A technology of withstand voltage test and detection method, which is applied in the direction of measuring electricity, short-circuit test, measuring device, etc., can solve the problems of long submarine cable length and difficulty in effectively judging the grounding condition of the end of the submarine cable.
Active Publication Date: 2021-08-27
HOHAI UNIV
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The more stringent condition is that the length of the submarine cable is relatively long, distributed over dozens or even hundreds of kilometers, and the end of the submarine cable is often in a remote place such as an island. Terminal grounding
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[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0020] This embodiment provides a method for detecting the grounding condition of the sheath end of the submarine cable withstand voltage test. The method includes:
[0021] Step 1: Construct the relationship between voltage and current at the beginning and end of the submarine cable
[0022] According to reference figure 1 The distributed parameter equivalent circuit of the submarine cable sheath and the submarine cable core lists the Kirchhoff equations including the KVL equation and the KCL equation; figure 1 Δx is the length of one microelement of the submarine cable, ΔU 1x is the difference between the voltage at the end of the wire core and the voltage at the head end under the microele...
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The invention discloses a method for detecting the grounding condition of the end of the sheath of a submarine cable withstand voltage test. The boundary conditions of the withstand voltage test of the submarine cable are brought into the constructed relationship between the voltage and current at the head and end of the submarine cable, and the calculation formula for the grounding resistance of the end of the sheath of the submarine cable is obtained. , according to the current at the head end of the submarine cable sheath and the structural parameters and material parameters of the submarine cable, use the calculation formula of the grounding resistance at the end of the submarine cable sheath to obtain the grounding resistance at the end of the submarine cable sheath, and compare the obtained grounding resistance at the end of the submarine cable sheath with the grounding resistance of the submarine cable The safety grounding resistance at the end of the sheath obtains the grounding condition of the sheath end of the submarine cable withstand voltage test; no test personnel are required to detect at the end of the sheath of the submarine cable, and the grounding condition from the head end to the end of the sheath of the submarine cable is realized according to the scheme provided by the invention The method of judgment is simple, and it provides guidance for ensuring the smooth progress of the submarine cable withstand voltage test.
Description
technical field [0001] The invention relates to a method for detecting the grounding condition of a sheath end of a submarine cable withstand voltage test, and belongs to the technical field of transmission line testing. Background technique [0002] When a submarine cable is subjected to a withstand voltage test, both ends of the sheath are grounded. When one end fails to be grounded, especially for submarine cables, a high value of ground voltage will be generated on the metal sheath, which will cause serious consequences such as sheath breakdown. The more stringent condition is that the length of the submarine cable is relatively long, distributed over dozens or even hundreds of kilometers, and the end of the submarine cable is often in a remote place such as an island. Terminal ground condition. Therefore, there is a need for a method to judge the grounding condition of the end of the submarine cable sheath by measuring the sheath current at the head end of the submarin...
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IPC IPC(8): G01R31/52G01R31/58G01R31/12
CPCG01R31/1272G01R31/50
Inventor 潘文霞孙凯谢晨李烨
Owner HOHAI UNIV