Device and method for testing armor loss of alternating current submarine power cable
A technology of submarine power cable and test device, which is applied in the direction of measuring device, measuring resistance/reactance/impedance, measuring electrical variables, etc. Low requirements, elimination of errors, real and reliable data
Active Publication Date: 2013-09-18
ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER +1
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Problems solved by technology
This method has high requirements on the current capacity of the secondary side of the transformer, and the method involves transformer loss, and the error is large
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[0019] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0020] The AC submarine power cable includes a wire core 4 , a metal sheath covering the wire core 4 and armor 5 .
[0021] Such as figure 1 As shown, the present invention includes a transformer 1, a tester 2 for detecting voltage and current, and the secondary side of the transformer 1 is provided with a tested submarine cable 3 connected end to end, and the tested submarine cable 3 passes through the transformer section as the transformer 1 Secondary side line group, the rest of the tested submarine cable 3 is the load. The test device includes at least one transformer 1 , the primary side windings of the transformer 1 are connected in parallel, and the tested submarine cable 3 passes through each transformer 1 in turn.
[0022] Such as figure 2 As shown, in order to eliminate the electromagnetic induction effect of the core-t...
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The invention discloses a device and a method for testing the armor loss of an alternating current submarine power cable, and relates to a loss testing device and a loss testing method. At present, the loss testing device has higher requirements on the through-current capability of the secondary side of a transformer, transformer loss is involved, and loss testing errors are greater. The alternating current submarine power cable comprises a cable core, a metal sheath wrapping the cable core and an armor. The device for testing the armor loss of the alternating current submarine power cable is characterized by comprising transformers and a tester for detecting current and voltage, wherein the tested submarine power cable is arranged on the secondary sides of the transformers in a penetration way, and the front end and the tail end of the tested submarine power cable are connected; and the section, which penetrates through the transformers, of the tested submarine power cable forms secondary windings of the transformers, and the other part of the tested submarine power cable is a load. According to the technical scheme, loss errors of the transformer are eliminated, data is more authentic and reliable, and requirements on test equipment are lower.
Description
technical field [0001] The invention relates to a device and method for testing loss. Background technique [0002] When the conductor of a single-core submarine cable passes a large current, an induced electromotive force will be generated on the armor and the metal sheath (lead sheath), and the alternating current of the wire core will generate a changing magnetic field, which will form an eddy current on the metal sheath and the armor , resulting in eddy current losses. Due to the particularity of the operating environment of the submarine cable, the armor and metal sheath can only be interconnected and grounded at both ends of the submarine cable line, and the resulting circulation will cause a large loss. These losses are collectively referred to as armor loss. Armor loss not only increases power loss and reduces current carrying capacity, but also adversely affects the life of the insulation layer and submarine power cables. The existing method for testing the armor ...
Claims
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IPC IPC(8): G01R27/26
Inventor 宣耀伟张磊郑新龙高震汪洋章正国张健
Owner ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER