Influence of Ultra-High-Voltage hybrid reactive power compensation on interruption performance of circuit breakers under different faults

• Published in: International journal of electrical power & energy systems 2024-02, Vol.156, p.109714, Article 109714
• Main Authors: Yang, Jingjing, Liu, Hongshun, Hou, Kaining, Kang, Zhaoyang, Li, Qingmin, Li, Qingquan
• Format: Article
• Language: English
• Subjects: Circuit breaker; hybrid reactive power compensation (HRPC); Interruption performance; Severity
• ISSN: 0142-0615
• DOI: 10.1016/j.ijepes.2023.109714

•The equivalent circuit of a 1100 kV UHV transmission system with Hybrid Reactive Power Compensation (HRPC) is developed. The severity is selected as the index of the interrupting characteristics of the circuit breaker, which is analyzed by the calculation method.•The waveforms of the drop-out current and transient recovery voltage (TRV) of circuit breaker are simulated before and after installation of HRPC to verify the validity of the calculation results.•The impact of different fault locations and compensation degrees on the interrupting characteristics of the most common faults in the power grid was analyzed. The interrupting characteristics of circuit breaker under different fault was compared. For extremely large ultra-high-voltage (UHV) power transmission and distribution lines with typical project using hybrid reactive power compensation (HRPC), single-phase earth fault (1LG), three-phase ground fault (3LG), phase-to-phase fault (2LS), and two-phase grounding fault (2LG) often occurs. Circuit breaker is one of the most critical equipment of UHV transmission system. And the interruption performance is crucial to circuit breakers’ breaking capability. In this study, formal expressions of the indicators for the interruption performance of the circuit breaker are deduced in case of different faults based on the equivalent-valued parameter circuit based on the structure a UHV demonstration project. The simulations are used to validate the accuracy of formal expressions. Then, the influence of such factors as the location of the fault and the degree of HRPC on the interruption performance of the 1LG, 2LG, 3LG, and 2LS is analyzed. Finally, the interruption performance of circuit breakers under different faults are compared. A quantitative evaluation of the influence of changes in the relevant indicators on the interruption performance of circuit breakers can provide a technical basis for choosing the appropriate design of the circuit breaker in light of the application as well as equipment development and assessment. © 2017 Elsevier Inc. All rights reserved.