Method for adjusting extreme value of electric field strength in insulation layer of high voltage power cable
A high-voltage power and cable insulation technology, which is applied in the direction of power cables, power cables with shielding layers/conductive layers, insulated cables, etc., to achieve the effect of improving utilization rate and withstand voltage level
Active Publication Date: 2018-08-03
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, propose a method for adjusting the extreme value of the electric field intensity in the insulating layer of high-voltage power cables, and solve the problems of the utilization rate of insulating materials and the withstand voltage level of high-voltage power cables
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[0021] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0022] A method for adjusting the extreme value of the electric field intensity in the insulating layer of a high-voltage power cable, comprising the following steps:
[0023] Step 1. Set the inner metal sleeve in the insulating layer of the cylindrical high-voltage power cable, and the center of the normal projected circle coincides with the center of the cable conductor.
[0024] Such as figure 1 As shown, this step is to set the inner metal sleeve in the insulating layer of the existing cylindrical high-voltage power cable to form a conductor 3, insulating layer 2, inner metal sleeve 4, insulating layer 2 and Ground metal shield 1.
[0025] Step 2. Calculating the extreme value of the electric field intensity between the conductor and the inner metal sleeve, calculating the extreme value of the electric field intensity between the inner me...
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Abstract
The invention relates to a method for adjusting the extreme value of the electric field strength in an insulation layer of a high voltage power cable. The method is technically characterized in that an inner metal sleeve is arranged in the insulation layer of the cylindrical high voltage power cable, and the center of the normal projection circle of the inner metal sleeve coincides with the centerof a cable conductor part; the extreme value of the electric field strength between the conductor and the inner metal sleeve is calculated; the extreme value of the electric field strength between the inner metal sleeve and a ground metal shield layer, the ratio of the extreme value of the electric field strength and the length of the inner metal sleeve are calculated; and according to the relationship between the length of the inner metal sleeve and the ratio of the extreme value of the electric field strength, the length of the inner metal sleeve is adjusted to adjust the ratio of the extreme value of the electric field strength in the insulation layer of the high voltage power cable. According to the invention, the design is reasonable; the utilization ratio of an insulation material can be effectively improved; the voltage withstand level of the power cable can be significantly improved under the premise of the same amount of the insulation material; and the method can be widely applied to cylindrical high voltage power cables of the voltage level of 3kV and above.
Description
technical field [0001] The invention belongs to the technical field of high-voltage power cables, in particular to a method for adjusting the extreme value of the electric field intensity in the insulating layer of the high-voltage power cable. Background technique [0002] Traditional cylindrical high-voltage power cables usually consist of a conductor, an insulation layer and a grounded metal shield. Since the electric field intensity reaches the maximum at the contact surface between the conductor and the insulating layer, its amplitude decreases with the increase of the radius, but the breakdown electric field intensity of the insulating material is a constant value, which leads to the insufficiency of the insulating material. Therefore, how to improve the utilization rate of insulating materials and the withstand voltage level of high-voltage power cables under the premise that the amount of insulating materials remains unchanged is an urgent problem to be solved at pre...
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IPC IPC(8): H01B7/02H01B7/17H01B9/02H01B13/22
CPCH01B7/02H01B7/17H01B9/028H01B13/22
Inventor 范巍兰春虎李盛伟王楠高军彦王梦杨赫王兆峰范伟王江
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO