Accurate selection method of neutral grounding resistance in urban distribution network
Accurate selection method of neutral grounding resistance in urban distribution network
- Author(s): L. Xiao 1 ; F. Chunju 1 ; Z. Chaoyang 2 ; G. Li 2 ; X. Shengli 2 ; F. Yongyu 2
- DOI: 10.1049/icp.2020.0090
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- Author(s): L. Xiao 1 ; F. Chunju 1 ; Z. Chaoyang 2 ; G. Li 2 ; X. Shengli 2 ; F. Yongyu 2
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View affiliations
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Affiliations:
1:
Shanghai Jiao Tong University , Department of Electrical Engineering, Shanghai , China ;
2: STATE GRID SUZHOU POWER SUPPLY COMPANY , Suzhou , China
Source:
The 16th IET International Conference on AC and DC Power Transmission (ACDC 2020),
2021
p.
100 – 105
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Affiliations:
1:
Shanghai Jiao Tong University , Department of Electrical Engineering, Shanghai , China ;
- Conference: The 16th IET International Conference on AC and DC Power Transmission (ACDC 2020)
- DOI: 10.1049/icp.2020.0090
- ISBN: 978-1-83953-330-3
- Location: Online Conference
- Conference date: 02-03 July 2020
- Format: PDF
With the development of city scale and for the purpose of city beautification, the capacitance current increases greatly in the distribution network, which will cause the capacity and volume of over compensated arc suppression coil to increase, and also bring inconvenience to the maintenance and operation of the power grid. At present, many urban power grids are transforming the neutral point grounding mode of distribution network, namely, the neutral point is grounded through low resistance. This grounding method can not only limit the over-voltage of the system but also improve the operation characteristics of the relay protection. The fault characteristics of single-phase ground fault and the action characteristics of zero sequence current protection were analyzed in detail when the neutral point is grounded through a low resistance. The selection method of low resistance value of neutral point was proposed to ensure reliable operation of zero sequence current protection. The relationship between the value of low resistance and the capacitance current was analyzed, with respect to the capacity of distribution network and other factors. The validity of proposed grounding resistance selection method is verified by numerous simulations in PSCAD/EMTDC. It shows that the proposed selection method of grounding resistance for distribution network is helpful for fault detection and clearance.
Inspec keywords: power distribution protection; relay protection; earthing; overvoltage protection; fault diagnosis; power grids; power system CAD; power distribution reliability
Subjects: Power engineering computing; Power system planning and layout; Electromagnetic compatibility and interference; Power system protection; Distribution networks; Reliability