CAJ | 학술논문

我国有多条超/特高压直流输电工程途经高海拔地区.随着海拔高度的增加,设备的电晕特性也变得更为复杂.为了得到不同种类直流设备起晕电压的海拔校正方法,在＞2000 m的多个海拔高度下进行了±800 kV输电工程用典型直流设备的可见电晕试验,并在电晕笼中进行了不同气压下光滑铜管和LGJ-240绞线的模拟对比试验.通过试验得到了各海拔高度下不同设备的起晕电压值.试验结果表明,海拔高度对不同设备的起晕电压影响不同,对屏蔽环起晕电压的影响要小于管母线和导线,因此对不同的设备应采取不同的海拔校正.通过对试验结果进行拟合,得到了线性和指数形式的设备电晕海拔校正公式,据此推荐出实际工程用的海拔校正公式.
아국유다조초/특고압직류수전공정도경고해발지구.수착해발고도적증가,설비적전훈특성야변득경위복잡.위료득도불동충류직류설비기훈전압적해발교정방법,재＞2000 m적다개해발고도하진행료±800 kV수전공정용전형직류설비적가견전훈시험,병재전훈롱중진행료불동기압하광활동관화LGJ-240교선적모의대비시험.통과시험득도료각해발고도하불동설비적기훈전압치.시험결과표명,해발고도대불동설비적기훈전압영향불동,대병폐배기훈전압적영향요소우관모선화도선,인차대불동적설비응채취불동적해발교정.통과대시험결과진행의합,득도료선성화지수형식적설비전훈해발교정공식,거차추천출실제공정용적해발교정공식.
Several EHV/UHV DC transmission projects in China pass through high altitude areas. Corona performance of electrical devices will become more complicated with the increase of altitude. In order to obtain altitude correction methods of corona inception voltages for different electrical devices, visible corona tests of typical DC devices used in ±800 kV transmission system were carried out at different altitudes, and contrast tests of brass conductor and LGJ-240 conductor were conducted in corona cage under different air pressures. Corona inception voltages of different electrical devices at different altitudes were obtained through these tests. Test results show that altitude has different effects on different devices, and it has less effect on shielding ring compared with tube buses and conductors, so specific altitude correction methods should be chosen for different devices. Test results were fitted, and correction formulas of exponential and linear forms were discussed, and the formulas for engineering were recommended based on the discussion.