ON THE NEED TO INCREASE THE RELIABILITY OF LINEAR INSULATORS FOR DISTRIBUTION NETWORKS 10-20 KV
Journal Title: Електротехніка і Електромеханіка - Year 2018, Vol 0, Issue 1
Abstract
Introduction. In Ukraine high voltage overhead distribution lines (OL) of class 6 and 10 kV are the most extended. Their total length exceeds 280,000 km. More than 95 % of the lines are made on line supports from reinforced concrete racks. On all poles of the overhead line, pin insulators are installed. According to the data of operation experience, up to 60-70 % of single-phase earth (SPE) faults due to «insulation» occurs on VL supports due to damage to line pin insulators, mainly during the thunderstorm period. Problem. Insufficient reliability of pin insulators leads to interruptions in power supply, accidents on the line, accidents in the area of reinforced concrete poles, where in the case of insulator damages, a long process of SPE occurs. Goal. The purpose of the work is to select the design and develop requirements for new linear insulators of 10-20 kV overhead lines that provide high resistance to lightning overvoltages with direct and inductive effects of lightning. Methodology. The research methodology consists in analyzing operational experience, calculating insulator parameters and laboratory tests. Results. Using statistical data on lightning parameters and data on mechanical loads on insulators, the main dimensions of line post insulators have been determined that will ensure their reliable operation under conditions of intense thunderstorm activity and extreme ice and wind loads. Conclusions. The main technical requirements for line post insulators for 10-20 kV distribution lines were formulated. On the 10 kV OL located in areas with increased thunderstorm activity it is recommended to use line post insulators instead of pin-type ones. On the OL-20 kV it is recommended to use only line post insulators. The use of high-lightning-resistant line post insulators on OL-10-20 kV will significantly increase the electrical safety and reliability of power supply to consumers. Increased by 2-3 times the cost of line post insulators in comparison with those used will be compensated for by the effects of reducing the number of collapsible supports, damage from under-supply of electricity, labor costs during transportation and restoration of destroyed supports, the moral side of reducing accidents in case of electric shock in the emergency zone. The insulators offered for OL-10-20 kV can be used for fixing both bare and protected wires. The exclusion from the design of the weakest elements – polyethylene caps and metal pins will increase the reliability of the power isolation unit.
Authors and Affiliations
Yu. N. Shumilov, V. G. Santotsky, E. D. Shumilova
Keywords
Related Articles
- EP ID EP485186
- DOI 10.20998/2074-272X.2018.1.10
- Views 89
- Downloads 0
ELECTRIC GENERATOR IN THE RECUPERATION SYSTEM OF THE ENERGY FROM MECHANICAL OSCILLATIONS IN VEHICLES
The paper deals with the system of mechanical energy recuperation of vehicles in the useful electric energy accumulated in the rechargeable battery. This system creates an additional power supply on board of the vehicle...
IDENTIFICATION OF TEMPERATURE DEPENDENCES OF CENTER-PUNCH SPECIFIC ELECTRICAL RESISTANCE DURING GRAPHITIZATION
A temperature dependence identification technique is worked out for graphitization furnace center-punch specific electrical resistance through applying a special object-oriented functional basis and temperature dependenc...
INCREASE OF ENERGY EFFICIENCY OF TESTING OF TRACTION ELECTRIC MACHINES OF DIRECT AND PULSATING CURRENT
The results of the analysis of the effect of the load current of traction electric machines when tested for heating on the total electricity consumption for the test are presented. It is shown that increase of load curre...
NEW HYPOTHESIS AND ELECTROPHYSICS NATURE OF ADDITIONAL MECHANISMS OF ORIGIN, ACCUMULATION AND DIVISION OF ELECTRIC CHARGES IN THE ATMOSPHERIC CLOUDS OF EARTH
Purpose. Development of new hypothesis about the possible additional mechanisms of origin, accumulation and division of electric charges in atmospheric clouds, containing shallow dispersible drops of water, shallow parti...
CALCULATION OF FIELDS AND CURRENTS IN THE INDUCTION SYSTEM WITH THE ATTRACTIVE SCREEN AND THE ADDITIONAL COIL AS A TOOL FOR THE STRAIGHTENING
In the idealization of the "limiting low" frequencies of acting fields the calculated dependences for the density of the induced currents and distributed force of the attractive in the induction system with attractive sc...