Abstract
Reviewed and analyzed issues related to the reliability of electricity supply in non-full-phase modes of electrical networks, to calculate which use adaptive methods, is built on one Central principle of modeling the modes of electric power systems (EPS). Special attention is paid to the calculation of damages from no full provided of electricity in non-full-phase modes.
Highlights
IntroductionAt damages (failures, incidents) of the main power supply equipment (power lines, groups of single-phase transformers, shunt reactors) in networks of 110 kV and above which are working with effectively grounded neutral, the main part of shutdowns is connected with steady single-phase short circuits which share reaches on the average 65%
At damages of the main power supply equipment in networks of 110 kV and above which are working with effectively grounded neutral, the main part of shutdowns is connected with steady single-phase short circuits which share reaches on the average 65%.This creates an alternative: 1. For the period of repair of damaged equipment if you want to disconnect the damaged item at all, reducing network throughput with feasible energyeconomic consequences in the form of limits to some consumers, the undersupply of electricity to them and thereby causing economic damage or 2
To identify the economic efficiency of the use of non-full-phase modes of the electric power systems (EPS) and to improve the reliability of the network, it is necessary: the first - is to estimate the no full provided of electricity to consumers with a limited load and the resulting economic damage when operating in a nonfull-phase mode; the second - is to determine the probability and frequency arising of non-full phase regimes; the third - is to determine the likely damage to consumers when the electric network operates in a nonfull-phase mode:
Summary
At damages (failures, incidents) of the main power supply equipment (power lines, groups of single-phase transformers, shunt reactors) in networks of 110 kV and above which are working with effectively grounded neutral, the main part of shutdowns is connected with steady single-phase short circuits which share reaches on the average 65%. Using single phase control switches or highlighting with disconnectors’ help of damaged phase, and translate the work of a damaged element in incomplete phase mode "two wires – ground", leading to the emergence of a network components of currents and voltages of inverse and zero sequences, with the corresponding consequences in the form of possible overloads in the remaining phases and overheating of transformers, generators and motors currents reverse sequence To prevent these overloads, it will be necessary limits the loads of consumers with the appearance no full provided of electricity and economic damage from power supply disruptions. To select the option of doing network mode: unbalanced or disconnection of the damaged element, it is necessary to match the likely impact of the limitations of loads in unbalanced modes with the damages caused by outages of corrupted items:
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