Method for locating cable fault inside wind power plant
A technology for cable faults and wind farms is applied in the field of locating faults of cables inside wind farms, which can solve problems such as limited positioning accuracy and achieve the effect of convenience.
Active Publication Date: 2015-04-22
SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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Problems solved by technology
However, this method requires additional hardware equipment, and the positioning accuracy is limited
[0004] 2. Or install directional protection on the cable line. Once a fault occurs, the current on the cable will reverse, and the fault can be judged by the current direction. However, this method also requires additional equipment related to line directional protection
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Embodiment Construction
[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] A method for locating cable faults inside a wind farm, comprising the following steps:
[0040] Step (1) Detect the CT measurement value of the fan outlet in each string structure inside the wind farm and the CT measurement value of the low-voltage side of the substation to determine the fault string;
[0041] Step (2) Detect the measured value of CT at the outlet of each fan in the fault chain, and obtain the magnitude relationship between the measured values of CT at the outlet of each fan;
[0042] Step (3) Locate the fault of the cable according to the relationship between the magnitude of the CT measurement value at the outlet of each fan and the distribution of the cable distance from the power grid.
[0043] Such as figure 1 , the internal structure diagram of a typical wind farm is given. The internal collector network of the wind far...
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The invention discloses a method for locating a cable fault inside a wind power plant. The method includes the steps of determining a fan bunch where the cable fault is by detecting the measured value of a fan outlet CT and the measured value of a transformer substation low voltage side CT in each bunch-type structure inside the wind power plant firstly, then detecting the measured value of the CT at the position of each fan outlet in a fault bunch, and further judging that in which section a fault point is located according to the relationship between the current value of each fan outlet and a distance from each fan outlet to a transformer substation. The method has the advantages that the fault can be judged by using the measured value of the existing fan outlet CT and the measured value of the existing transformer substation low voltage side CT under the condition that extra hardware equipment and extra hardware investment are not added, the scheme is feasible, and the method is convenient to implement.
Description
technical field [0001] The invention relates to a method for locating a fault of a power collecting network cable inside a wind farm, in particular to a method for locating a fault of a cable inside a wind farm without adding additional hardware equipment. Background technique [0002] At present, there are many methods for locating cable faults inside wind farms, but all of them have certain shortcomings. The analysis is as follows: [0003] 1. At present, many companies have launched cable fault locators. Cable fault locators on the market usually use the traveling wave method to judge whether there is a fault and locate it by comparing it with the waveform fed back by transmitting a sinusoidal signal on the cable. However, this method requires additional hardware devices and has limited positioning accuracy. [0004] 2. Or install directional protection on the cable line. Once a fault occurs, the current on the cable will reverse, and the fault can be judged by the curr...
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IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 樊潇周建许卫东卢永魁郑春强王海东黄玲玲魏书荣
Owner SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP