Shielding chamber cable grounding method
A technology of cable entry and grounding method, which is applied in the direction of power cable with shielding layer/conductive layer, grounding device, cable/conductor manufacturing, etc., and can solve problems such as loss of protection effect, shielding failure, and loss of shielding integrity in shielded cells
Active Publication Date: 2009-10-28
STATE GRID ELECTRIC POWER RES INST
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[0004] Since the shielding effectiveness of the shielding chamber is closely related to its structure, the holes have a great impact on the shielding performance of the shielding chamber, and too many holes and gaps will lead to the loss of the integrity of the shielding, thus making the shielding chamber lose its due protection. Effect
However, since it is inevitable for the signal cables and power cables of the secondary equipment to enter and leave the shielding room, how to solve the problem of shielding failure caused by the cable passing through the wall of the protection room has not been completely solved, so that it seriously affects the structural design of the shielding room and construction of power transmission and transformation projects
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[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples, but these examples should not be construed as limiting the present invention.
[0025] Aiming at the characteristics of the interference source of the 500kV substation, the invention proposes a grounding method and a device when cables enter and exit the shielding chamber of the secondary equipment, thereby ensuring the shielding effectiveness of the shielding chamber.
[0026] 1) For the cables entering and leaving the shielding chamber, it is an important aspect to ensure good shielding effectiveness to ensure that the shielding layer is well connected with the steel structure of the shielding chamber and grounded together.
[0027] Roxtec EMC cable transits become an integral part of the shielding field around the equipment. A shield represents an obstacle that prevents the input or output of electromagnetic energy, whether it is transmitted in ...
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The invention relates to a shielding chamber cable grounding method which comprises the following steps: as for a cable entering into and exiting from a shielding chamber, a Roxtec EMC module is adopted to well connect a shielding layer of the cable and a reinforced steel structure of the shielding chamber, and the shielding layer of the cable and the reinforced steel structure of the shielding chamber are grounded together; a filter is additionally arranged between the shielding layer of the cable and a cable core for filtering out interference signals so as to partition electromagnetic energy inside and outside the shielding chamber caused by the entry and exit of the cable. According to the shielding principle of the shielding chamber, the invention analyzes factors affecting shielding effectiveness and conducts grounding method research and device development according to the structure of the cable entering into and exiting from the shielding chamber, thereby ensuring the shielding property of the shielding chamber. The method has rather high accuracy and can be applied to the precise computation of the electromagnetism prevention distance between a high-voltage power transmission line and an adjacent wireless radio station in the future.
Description
technical field [0001] The invention belongs to the field of electromagnetic compatibility of high-voltage power transmission and transformation projects, and in particular relates to a grounding method for cable incoming wires in shielding chambers of substation protection equipment. Background technique [0002] my country's electric power construction is developing rapidly. At present, the country has formed a power network with 500kV voltage level transmission lines as the backbone skeleton. The world-renowned Three Gorges Project is a power transmission and transformation project with a 500kV voltage level as the output line level. It meets the electricity demand for the sustainable development of my country's economy and society. [0003] The power transmission and transformation project includes two parts: power transmission and power transformation, and the substation performs the power transformation task. Since there are many high-voltage equipment once charged in ...
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IPC IPC(8): H02B1/16H01B9/02H01B13/00H03H7/06
Inventor 万保权邬雄张广洲张小武王勤蒋虹谢辉春
Owner STATE GRID ELECTRIC POWER RES INST