Abstract
With the increasing day by day integration of large-size generators and tighter among the power systems, in internal fault, the fault current of Series Compensated (SC) lines could also be upturned. Therefore, the differential protection of SC transmission lines may stop working to operate because of less sensitivity. In this research article the causes for the current overturning in SC lines and its effects differential protection. The working characteristics of differential protection are analyzed by focusing on multiple-factors, for example, different series compensation degrees, types of fault, system operation mode, the difference of power angle, points of the fault, and transition resistance. An enhanced standard based on the current amplitudes and phases on both sides of the series compensated lines is proposed. Furthermore, to make stronger the operation characteristics of differential protection, the triple-fold line is chosen to get better sensitivity for internal faults in the article. The results are efficient to improve the protection sensitivity of SC lines during the internal fault. The PSCAD/EMTDC simulation and the power system dynamic physics simulation demonstrate that protection sensitivity is increased in the improved scheme. Keywords : Differential Protection, Series compensation, EHV/ UHV, Current reverse, sensitivity analysis. DOI: 10.7176/CTI/10-06 Publication date: August 31 st 2020
Highlights
The series compensated which is denoted by Series Compensated (SC) are largely used in today’s power systems because of many advantages, likewise, good system stability, excellent power transmission, reduce transmission losses, improvement in voltage control, and high loading capacity of the transmission line[1,2,3]
The characteristics of the current reverse in internal fault lines of SC are studied in this research
The current reverse disappears in 1ms when the internal symmetric fault occurs on the SC lines, which has no effect on differential safety
Summary
The series compensated which is denoted by SC are largely used in today’s power systems because of many advantages, likewise, good system stability, excellent power transmission, reduce transmission losses, improvement in voltage control, and high loading capacity of the transmission line[1,2,3]. The vector’s balance in the transmission line is destroyed, which mostly causes problems such as current and voltage overturn when fault diagnosed on the compensated line. As a result, these capacitors influence the operational behavior of the power system, and the performance of relay protection under short circuits [4, 5]. We study the effects of SC degree, the difference in power angle, transition resistance, type of fault, system operation mode, and fault point on differential protection operation characteristics
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