Extension strategy for Bus-Bar Differential Protection in smart substation

2014 ◽  
Author(s):  
Dai Shiqiang ◽  
Qiu Yutao ◽  
Wu Jing ◽  
Wu Wenlian ◽  
Lin Sen
Keyword(s):  
Differential Protection ◽  
Smart Substation

scholarly journals An improved simulated load test system

2021 ◽  
Vol 2093 (1) ◽  
pp. 012019
Author(s):  
Liang Hua ◽  
Jiaen Qi ◽  
Wei Huang ◽  
Sijiang Zhang ◽  
Feng Gao ◽  
...  
Keyword(s):  
High Precision ◽  
Relay Protection ◽  
Test System ◽  
Load Test ◽  
Differential Protection ◽  
Test Device ◽  
Merging Unit ◽  
Transformation Ratio ◽  
Smart Substation

Abstract A miniaturized analog load-checking relay protection test device is developed in this paper, in which a high-precision wireless phase volt-ampere test device is configured. This device, characterized by intelligence and ease of operation, realizes the detection of the transformation ratio, polarity, phase, etc. of the secondary wiring of the transformer in the smart substation merging unit and the conventional substation. It meets the testing requirements of smart substations, and can test bus differential protection, line protection, and various protections such as main transformer differential.

scholarly journals Substation protection method for missing measurement information of transformer and bus connecting line

2021 ◽  
Vol 261 ◽  
pp. 01042
Author(s):  
Wei Liu ◽  
Yuxue Wang ◽  
Zengchao Wang ◽  
Zhile Xu ◽  
Yiquan Li ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Simulation Software ◽  
Measurement Information ◽  
Inrush Current ◽  
Differential Protection ◽  
Protection Method ◽  
Electromagnetic Transient Simulation ◽  
The Stability ◽  
Types Of Faults ◽  
Smart Substation

In order to solve the problems of protection misoperation and refusing to operate caused by the lack of measurement information in smart substation, a substation protection method which can effectively eliminate the influence of transformer inrush current and bus CT saturation when the measurement information of substation and bus connecting line is missing is proposed. Through the theoretical analysis of current synthesis method based on Kirchhoff current law, it is proved that transformer inrush current and bus CT saturation will lead to the misjudgment of differential protection. Accordingly a new method of station protection is proposed to deal with the lack of measurement information. In order to verify the correctness of the method, taking a typical 220kV substation model as an example, PSCAD / EMTDC electromagnetic transient simulation software is used to simulate and verify different conditions and different types of faults. The results show that the proposed protection method can accurately eliminate the interference of transformer inrush current and bus CT saturation, ensure the correct action of differential protection, and improve the stability of substation when the measurement information is missing.

A Novel Fuzzy Theory-Based Differential Protection Scheme for Transmission Lines

2020 ◽  
Vol 12 (8) ◽  
Author(s):  
Mahyar Abasi ◽  
◽  
Ahmad Torabi Farsani ◽  
Arash Rohani ◽  
Arsalan Beigzadeh ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Fuzzy Theory ◽  
Differential Protection ◽  
Protection Scheme

Smart Substation Monitoring and Control

2021 ◽  
Author(s):  
N Loganathan ◽  
J Prasanth ◽  
R Shankara Saravanan ◽  
V Jayasuriya ◽  
S Karthikeyan
Keyword(s):  
Monitoring And Control ◽  
And Control ◽  
Smart Substation
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