Abstract
This program was developed as a universal model of typical devices for protecting electrical networks with insulated neutral. Imitation experiments are executed by the design of working operating and emergency modes. It has been established as in real-world conditions with unselective wearing-outs o
Highlights
Power systems are exposed to damage and abnormal operated modes
For example: undervoltage of network leads to failure of protection devices, in emergency operation of work on the protected accession, as the voltage increases - to the unselective disconnecting as emergency operation out of the protected accession
Engineering designed experimental model of network with isolated neutral and universal model of current protection devices on the basis of this model performed the experiment connecting with various forms of defense
Summary
Power systems are exposed to damage and abnormal operated modes. The main reasons of damage are: the violations of isolation current parts, overvoltage, mechanical damage, damages of wires and supports electricity transmission line, connecting with their unsatisfactory state, ice surface and etc. [1]. While the map of setpoints remains unchanging, so becomes the main reason of unselective operation to protecting devices It is characteristically for the enterprises of mining industry, for coal and ore mines. In the expended case of sourcing electricity and electrical transmission line with spaced settings of demand specifications and time-varying parameters of defensive electrical network include in general the power source of electrical main with distributed constants capacity as usual induction motor and elements of devices, formation an integral part of protection. As the result of small difference summery inductance between the antecedent and fallows part in cable distribution network of mains voltage fluctuation at normal or overload capacity leads to unselective protecting operation. - indicate the mode is leading to non selective actuating defensive devices
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