A circuit breaker may be considered an ‘active link’, used to make and break an electrical circuit under conditions of varying severity. In the event of a circuit fault the circuit breaker must respond within tens of milliseconds in order to prevent damage to connected plant and safeguard personnel. As such, a circuit breaker will remain idle for the bulk of its lifetime, only being called into...

Rock-breaker automation and remote operation improves the safety and efficiency of mining operations. This article presents an overview of the Rocklogic rock-breaker automation system architecture that provides collision avoidance, automated parking, and remote operation functionality. The system consists of a distributed computer control system that interfaces with sensors attached to the rock...

Two new versions of the so-called Maker-Breaker Positional Games are defined by József Beck in [Combinatorica 22(2) (2002) 169–216]. He defines two players, Picker and Chooser. In each round, Picker takes a pair of elements not already selected and Chooser keeps one and returns the other to Picker. In the Picker-Chooser version Picker plays as Maker and Chooser plays as Breaker, while the roles...

A breaker restrike is an abnormal arcing phenomenon, leading to a possible breaker failure. Eventually, this failure leads to interruption of the transmission and distribution of the electricity supply system until the breaker is replaced. Before 2008, there was little evidence in the literature of monitoring techniques based on restrike measurement and interpretation produced during switching ...

Generally, the failure rate and the repair time of system components are constant parameters in reliability assessment of electric distribution systems. A failure of component is resulted from failing in the operation or overloading. In addition, there exist cases where, the repair times of components are small and tolerable from customer point of view. Thus, tolerable repair times may be overl...

We introduce and analyze the Walker-Breaker game, a variant of Maker-Breaker games where Maker is constrained to choose edges of a walk or path in a given graph G, with the goal of visiting as many vertices of the underlying graph as possible.

The automated circuit breaker diagnostic system described in this paper is an extension of the widely used portable circuit breaker testing device concept. These traditional testing devices can be connected to the circuit breaker’s control circuit to record analog and digital signals. The operator opens and closes the circuit breaker each time the test is performed and makes the recordings. The...

Given a graph G and positive integers n and q, let G(G;n, q) be the game played on the edges of the complete graph Kn in which the two players, Maker and Breaker, alternately claim 1 and q edges, respectively. Maker’s goal is to occupy all edges in some copy of G; Breaker tries to prevent it. In their seminal paper on positional games, Chvátal and Erdős proved that in the game G(K3;n, q), Maker...