Abstract
At present, action criterions of Phase-segregated current differential protection in Transmission line of UHV include the criterion based on whole current, instantaneous value of fault and other changing from it. In different areas of fault, reach criterion has different reliability and sensitivity. On the basis of deeply analyses and study of the principle for Phase-segregated current differential protection, this paper combines intelligence Agent technology, and creates an intelligent protection structure which can choose reasonable action criterion according to the place of fault, and it can make the reliability and sensitivity of Phase-segregated current differential protection in Transmission line of UHV improved.
Highlights
At present, action criterions of Phase-segregated current differential protection in Transmission line of UHV include the criterion based on whole current, instantaneous value of fault and other changing from it
In order to satisfy the development of the Northwest power grid to solve large-capacity power send out from west to east, adopting UHV transmission is a general trend, so the country's first of UHV transmission lines has been built in china: the 750kv single system about 146km from GuanTing to LanZhou East
Compared with other EHV(330kv,500kv,etc), the 750kv transmission lines UHV brings about greater capacity of current and longer distance transmission, the too high voltage and capacitance current caused by short circuit impact on the System reliability and stability
Summary
Action criterions of Phase-segregated current differential protection in Transmission line of UHV include the criterion based on whole current, instantaneous value of fault and other changing from it. High voltage shunt reactor are inserted in the actual transmission line to compensate part of capacitive current, reduce the influence and increase sensitivity of capacitive current differential protection, but when the line is longer, the circuit will still be larger capacitive current, it will affect the normal operation of the protection.
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