[논문]Corona generated Radio Interference of the 750 kV AC Bundle Conductors in Sandy and Dusty Weather Condition in the High Altitude Area

Liu, Yun-Peng; Zhu, Lei; Lv, Fang-Cheng; Wan, Bao-Quan; Pei, Chun-Ming

doi:10.5370/jeet.2014.9.5.1704

Corona generated Radio Interference of the 750 kV AC Bundle Conductors in Sandy and Dusty Weather Condition in the High Altitude Area 원문보기

Journal of electrical engineering & technology, v.9 no.5, 2014년, pp.1704 - 1711

Liu, Yun-Peng (Hebei Provincial Key Laboratory of Power Equipment Security Defense, North China Electric Power University) , Zhu, Lei (Hebei Provincial Key Laboratory of Power Equipment Security Defense, North China Electric Power University) , Lv, Fang-Cheng (Hebei Provincial Key Laboratory of Power Equipment Security Defense, North China Electric Power University) , Wan, Bao-Quan (High Voltage Department, China Electric Power Research Institute) , Pei, Chun-Ming (High Voltage Department, China Electric Power Research Institute)

Abstract ▼ AI-Helper

Sandy and dusty weather condition often occurs in the high altitude areas of China, which may greatly influence the corona generated radio interference (RI) characteristics of the bundle conductors of 750 kV AC power transmission lines. Corona generated RI of the conductors of the 750 kV AC power transmission lines used in practice is measured by EMI receiver with a coupling circuit and a coupling capacitor connected between the high voltage side and the earth side in fine and sandy and dusty condition. The measuring frequency is 0.5 MHz, and the quasi-peak detection is used. RI excitation function is calculated based on the corona RI current measured by the EMI receiver. Corona generated RI characteristics were analyzed from sand concentration and sand particle size. The test result shows that the corona generated RI excitation function is influenced by the sandy and dusty condition. Corona discharge of the conductors is more serious in sandy and dusty condition with an ultraviolet (UV) detector. Corona generated RI excitation function increases with the increase of sand concentration and also increases with the increase of particle size.

주제어

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제안 방법

In this study, the UV corona discharge imager (DayCor ‘Superb’ corona module, made in Israel) is used to test the corona discharge intensity in sandy and dusty condition and in fine condition.

대상 데이터

3. The altitude of the test spot (Haibei Tibetan Autonomous Prefecture, Qinghai Province) is 3042 m. The parameters of the series resonance transformer are: rated input voltage 380 V, rated output voltage 600 kV, and apparent power 1200 kVA.
Also, a corona cage has the following advantages: reproducing the corona discharge status with a much lower test voltage, lower investment, convenience to transport (especially for high altitude test) and convenience in adjusting the experiment conditions. The parameters of the corona cage in this test are: measuring part 8 m, shielding part 1 m, and side length of the square section 6 m. Corona loss, RI, and audible noise generated by corona discharge of the bundle conductors of different dimensions and structures in different altitudes could be done using the cage in this study, as shown in Fig.
The stranded conductors used in the test are LGJ400-50 (bundle space 400 mm), the diameter of which is 27.63mm. The abscissas of the figures are the maximum surface electric field strengths of the LGJ400-50 conductors, which are calculated with the finite element method using the software ANSYS.
In corona cage, the conducted radio interference current of the conductor is measured by the EMI receiver, and the real RI interference could be gained with the excitation function method. The test equipments include coupling circuit, EMI receiver, wave trapper, and coaxial cable. The coupling circuit could be connected in two connection ways: one is connecting the high voltage coupling capacitor and coupling circuit between the high voltage test conductor and the ground; the other is connecting the coupling circuit between the corona cage wall and the ground.

데이터처리

63mm. The abscissas of the figures are the maximum surface electric field strengths of the LGJ400-50 conductors, which are calculated with the finite element method using the software ANSYS. When the voltage is 100 kV (effective value) the maximum surface electric field strength of the smooth conductors, which have the same diameters as the stranded ones, is 6.

이론/모형

The radio interference meter is the calibrated FCKL 1528 made by Schwarzbeck Mess Corporation. The reference frequency is 0.5 MHz, and quasi-peak detection method is used.

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