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- W2353873819 abstract "The neutral point of 35kV distribution system is often earthed by arc-extinction coil in oil field and the manual shift type arc-extinction coil is installed largely. Working method of the manual shift type arc-extinction coil is to select operational tap by rough estimating system coupling current on the basis of net structure. Because the rough estimating method isn't exact, it is possible that three-phase voltage is unbalanced and the neutral point displacement voltage is high. This paper firstly presents calculating formulae of neutral point displacement voltage in theory. Then system simulating model is established using EMTP/ATP and the steady-state working characteristic of system is calculated, taking an example of a 35kV substation. The calculating result indicates that the neutral point displacement voltage could reach 4369V at most, much more than the standard allowable value 3000V, if the operational tap of arc-extinction coil is not chosen suitably. So it is necessary to take methods avoiding such situation. The paper compares two methods and one of them is selected that the neutral point displacement voltage can be limited less than standard allowable value by reducing the unbalanced voltage. By calculation and analysis, it is known that three-phase voltage unbalance is caused by asymmetrical installation of coupling capacitors for communication on A, B, C phase. By fully comparing three methods in allusion to coupling capacitor in their actualized difficulty, effect and the ratio of capability to price, it is sure that adjusting the phase place of coupling capacitors is an effective method to lower the unbalanced voltage. Finally validity and feasibility of the method is validated by test. After the method is actualized, three-phase voltage of the substation is balanced basically. The neutral point unbalanced voltage can be controlled less than 500V and the neutral point displacement voltage isn't more than 1148V, whatever working mode the system is. Such method absolutely satisfies working requirement." @default.
- W2353873819 created "2016-06-24" @default.
- W2353873819 creator A5083142408 @default.
- W2353873819 date "2006-01-01" @default.
- W2353873819 modified "2023-09-25" @default.
- W2353873819 title "Study on Three-phase Voltage Unbalance of 35kV Distribution System in Oil Field" @default.
- W2353873819 hasPublicationYear "2006" @default.
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