A Study on Operation Algorithm of Protection Device for Single Line Short Circuit of GVT in Ungrounded System

Yoon, Hyoung-Ik; Choi, Sung-Sik; Lee, Hu-Dong; Nam, Yang-Hyun; Rho, Dae-Seok

doi:10.5370/kiee.2019.68.2.253

Cited by 2 publications

(1 citation statement)

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“…However, in urban distribution network substations, for balanced third harmonic flux, due to the non-linearity of the transformer core, the transformer 10 kV side is generally triangular wiring without a grounding point lead [18]. To achieve the neutral point by small resistance grounding, the grounding transformer can be configured to introduce an additional grounding point.…”

Section: Introduction Methods Of An Additional Neutral Pointmentioning

confidence: 99%

Analysis of Fault Characteristics of Distribution Network with PST Loop Closing Device under Small Current Grounding System

Tang²,

Jiang³

et al. 2022

Energies

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With the rapid development of cities and the increasing complexity of distribution network systems, the cableization of transmission lines and the diversification of power users have brought new challenges to the supply reliability of distribution networks. Short-time outages caused by power outages and maintenance are one of the factors that affect the reliability of the power supply in the distribution network. The non-stop load transfer through a phase-shifting transformer (PST) operation can effectively improve the reliability of power supply to complex distribution systems. Considering the operation mode and structure form and fault type of the urban distribution network in China, comparing and analyzing the applicable scenarios of different neutral grounding methods, and based on the structure and zero sequence path characteristics of PST, an improved PST-based phase shifting and grounding transformer loop closing device with low power consumption is proposed. The fault characteristics of the PST-based loop closing device under the small current grounding system are also analyzed by the sequence component method, and, finally, the effectiveness of the phase-shifting and grounding transformer device is verified by simulation under PSCAD/EMTDC for fault routing and protection configuration of the urban distribution network in China.

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Section: Introduction Methods Of An Additional Neutral Pointmentioning

confidence: 99%