Tower grounding impedance testing method for measuring abnormal frequency current of down leads
A technology of grounding impedance and different frequency current, applied in the direction of grounding resistance measurement, etc., can solve problems such as inability to solve, and achieve the effect of avoiding interference and improving efficiency
Inactive Publication Date: 2015-04-29
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
In general, both methods need to untie the grounding down conductor of the tower, but in practical applications, on the one hand, some grounding down conductors of the tower cannot be untied due to construction reasons or the influence of external factors; The first method is to use the clamp meter to measure certain prerequisites. In the actual measurement, some field personnel keep all the grounding down-conductors for measurement, and get the conclusion that the grounding impedance of the tower is qualified, but the actual measurement is the whole metal circuit. Resistance, the measurement result at this time is not the tower grounding impedance
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[0021] Below by embodiment, in conjunction with accompanying drawing, it is further described to technical scheme of the present invention:
[0022] See figure 1 , the first step is to determine the maximum diagonal length l of the tower grounding device and the number n of the grounding device's down conductors. The diagonal length of the tested 110kVXX line N35 tower grounding device is 20m, and there are 2 grounding down conductors in total. ;
[0023] In the second step, according to the length l of the maximum diagonal line of the grounding device of the tower, arrange the current electrode C and the voltage electrode P for testing at a suitable position, and choose to arrange the current electrode at a position 80 meters away from the tower according to the parameters obtained in the first step C. Arrange the voltage pole at the position of 50 meters, and arrange the connecting wires for testing, such as 1, 2, 3, 4, 5, 6 in the attached drawing. The testing wires 1 and ...
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A tower grounding impedance testing method for measuring abnormal frequency currents of down leads includes the following steps of firstly, determining the length l of the maximum diagonal of a tower grounding device and the number n of the down leads of the grounding device; secondly, arranging a current electrode C for testing, a voltage electrode P for testing and a corresponding measurement connecting wire at appropriate positions according to the length l of the maximum diagonal of the tower grounding device; thirdly, exerting currents between a tower and the current electrode C for testing, wherein the frequency f1 of the currents is different from the working frequency and is equal to the difference between 50 and delta f, and the delta f is the frequency difference between the working frequency and 50 Hz and can be freely selected between 3 Hz to 10 Hz. By means of the method, the frequency selecting characteristic is fully utilized, the interference of the working frequency is avoided, and quite high accuracy is achieved; the earth currents of the grounding down leads are measured, the grounding device can be prevented from being detached, the convenience of site construction is improved, and efficiency is improved.
Description
technical field [0001] The present invention relates to a tower grounding impedance testing method, in particular to a tower grounding impedance testing method based on two accurate measurements of different frequency currents of grounding down conductors, which is suitable for typical tower grounding devices with 2 or 4 down conductors The invention relates to a grounding impedance test, which belongs to the technical field of characteristic parameter measurement of a power system grounding device. Background technique [0002] The tower ground grid is an important part of the transmission line. The size of its grounding impedance directly affects the lightning withstand level of the line. If the grounding impedance is too large, it will affect the normal permission of the line. Therefore, in the power system-related operating procedures and preventive test procedures, it is stipulated that periodic measurements are required. Due to the large number of transmission line tow...
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IPC IPC(8): G01R27/20
Inventor 马御棠王磊马仪侯亚非周仿荣王科申元
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST