A Probabilistic Approach to the Protection Capability Evaluation of Distance Relay in Transmission Systems

Zhang, Wenhao; Lee, Seungjae; Choi, Myeon-Song

doi:10.5370/jeet.2010.5.3.407

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…For example, the zone-1 setting of distance relay in conventional approaches is considered to be 80 percent of the line impedance [5]. Considering the fact that the safety margin can be changed for different networks with different measuring devices, in [6][7], probabilistic methods have been proposed for determining the setting of distance relay.…”

Section: Introductionmentioning

confidence: 99%

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A new optimization formulation for determining the optimum reach setting of distance relay zones by probabilistic modeling of uncertainties

2016

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In this paper, by probabilistic modeling of uncertainties, the problem of determining the reach setting of distance relay zones is presented as a new optimization problem. For this purpose, uncertainties are modeled based on their probability density functions. Then, by using the Monte-Carlo process, the impedance seen by the distance relay is obtained. In this paper, probabilistic sensitivity and selectivity indices are defined for each zone of the distance relay. Therefore, the problem of determining the optimum reach setting of distance relay for each zone is converted to an optimization problem with the objective of maximizing of the probabilities indices of sensitivity and selectivity. The objective function and the constraints of the optimization problem are defined based on the protection philosophy of each of the three different zones of the distance relay. Considering the fact that the optimization problem is nonlinear and non-convex, the particle swarm optimization (PSO) is used to solve this problem. The proposed optimization problem is applied on a 9-bus network, and the reach settings of distance relays are calculated and compared with those of the conventional approach. Also, uncertainties are prioritized based on the amount of their impact on the probabilistic indices of sensitivity and selectivity.

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Section: Introductionmentioning

confidence: 99%

“…In [7], uncertainties such as measuring errors, fault location, and fault resistance, have been identified as the effective factors on distance relay. Then, the amount of variations in the probabilities of sensitivity and selectivity for variations in the reach setting of distance relay has been obtained.…”

Section: Introductionmentioning

confidence: 99%