Monitoring of earth faults and undervoltage is an elementary and important integral part of the spatially distributed plant components or current networks with connected functions and monitoring. The special minings-related tasks in connection with functional reliability should be noted. As all systems in the input and output areas contain circuits provided with conventional equipment, it is immaterial whether the central or decentralised signal processing systems are constructed with conventional or modern computer-aided equipment. As the functional and technical relationships also determined to some extent by the structures as well as the safety requirements, on which the earth-fault and undervoltage monitoring is based, are often not correctly or fully recognised, it is logical for the operators of shaft winding equipment that the safety problems cannot be solved with several manufacturers but with only one contact and/or manufacturer. Structural and equipment integration is likewise logical so that when this integrated monitoring equipment is installed only wiring work and no special additional equipment are required for operation.
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