NDLI: Cross-voltage short-circuit calculation for mixed-voltage quadruple-circuit lines on the same tower

Content Provider	IET Digital Library
Author	Zheng, Tao Zhang, Jiaqin Wu, Dan Huang, Shaofeng Wang, Xiaoli
Abstract	Cross-voltage faults, i.e. multi-circuit faults that occur between different voltage level systems, in mixed-voltage quadruple-circuit transmission lines occur at times. The short-circuit calculations, which are the basis of the relay protection settings, for different faults are required. This study proposes a new method based on the theory of multiple fault analysis. First, the cross-voltage fault is regarded as a double multiple fault of the system. By retaining the fault nodes and the ground node, while eliminating all the intermediate nodes, the equivalent impedance of each sequence is obtained. Next, the fault reference phase is selected and the two-port network of each sequence that belongs to the reference phase is formed. Further, the port voltages of each sequence are transferred to a special phase using phase-shifting transformers. Then, a unified composite sequence network is formed according to the boundary conditions of the special phase. Finally, a set of equations are listed based on the composite sequence network in order to determine the fault currents and voltages. The simulation results in PSCAD agree well with the results calculated using the above algorithm, verifying the accuracy of this method.
Starting Page	2342
Ending Page	2350
Page Count	9
ISSN	17518687
Volume Number	11
e-ISSN	17518695
Issue Number	Issue 9, Jun (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/11/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2016.1808
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-03-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Boundary Condition Connector Cross-voltage Fault Cross-voltage Short-circuit Calculation Double Multiple Fault Fault Node Fault Reference Phase Ground Node Insulator Mixed-voltage Quadruple-circuit Transmission Line Multicircuit Fault Multiple Fault Analysis Network And Transmission Line Calculations Phase-shifting Transformer Poles And Towers Port Voltage Power Line Supports Power System Protection Power Transformer Power Transmission Fault Power Transmission Line Power Transmission Protection PSCAD Relay Protection Short-circuit Current Transformer And Reactors Two-port Network Unified Composite Sequence Network Voltage Level System
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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