Abstract
This paper proposes an original busbar protection method, based on the characteristics of the fault components. The method firstly extracts the fault components of the current and voltage after the occurrence of a fault, secondly it uses a novel phase-mode transformation array to obtain the aerial mode components, and lastly, it obtains the sign of the average product of the aerial mode voltage and current. For a fault on the busbar, the average products that are detected on all of the lines that are linked to the faulted busbar are all positive within a specific duration of the post-fault. However, for a fault at any one of these lines, the average product that has been detected on the faulted line is negative, while those on the non-faulted lines are positive. On the basis of the characteristic difference that is mentioned above, the identification criterion of the fault direction is established. Through comparing the fault directions on all of the lines, the busbar protection can quickly discriminate between an internal fault and an external fault. By utilizing the PSCAD/EMTDC software (4.6.0.0, Manitoba HVDC Research Centre, Winnipeg, MB, Canada), a typical 500 kV busbar model, with one and a half circuit breakers configuration, was constructed. The simulation results show that the proposed busbar protection has a good adjustability, high reliability, and rapid operation speed.
Highlights
As one of the most significant elements in electric power systems, the busbar takes on the crucial task of the collection and distribution power
The widely used busbar protection is the current differential protection [1,2,3], whose performance is affected by the current transformer (CT) saturation, CT ratio-mismatch, and so on
In order to counteract the influence of the CT saturation, a series of algorithms for detecting the CT saturation are proposed in the works of [4,5,6,7], but these methods generally cause a delay in the operation time
Summary
As one of the most significant elements in electric power systems, the busbar takes on the crucial task of the collection and distribution power. The authors only analyze and simulate a simple single busbar the average of superimposed components, are put forward in the work of Hashemi et al and configuration in Song et al [15] Referring to their ideas, the paper presents an original busbar. The authors only analyze and simulate a simple single protection technique, according to the polarity differences of the average products on all of the busbar configuration in Song et al [15] Referring to their ideas, the paper presents an original busbar branches that are connected to the busbar. In order to testify to the on the other non-faulted lines are positive Taking advantage of these characteristic differences, a novel effectiveness and practicability of the presented busbar protection, an effective 500 kV substation busbar protection criterion is established.
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