Abstract
The article discusses the distribution of the lightning current between communications of the object as the main aspect determining surge protective devices (SPDs) parameters for applying in substation’s low voltage networks. Wireframe model was designed to compute field-circuit model of earthing device (ED) and define the element potentials and currents using circuit analysis methods. Transients were calculated using operator method. Results of calculation and measurements of the lightning current’s distribution in ED and cables in illumination network of air insulated substation presented. Experimental study results obtained in training ground PJSC «Lenenergo», one of the largest electric power distribution company in Russia. Case of lightning strike in the floodlight mast combined с with lightning rod in 110 kV air insulated substation was studied. Requirements for the parameter "impulse discharge current amplitude" SPD defined. Described general approaches to the illumination network’s lightning surge protection on air insulated substation.
Highlights
Lightning overvoltages perform the most significant impact on requirements for ensuring EMC of at high-voltage substations up to 220 kV
In described conditions the routs of cable lines (CL) are not restricted by shielded volume (in terms of IEC 62305 standard [1] – within one lightning protection zone (LPZ))
Wireframe model of 110 kV air insulated substation (Fig.1) was designed to compute the field-circuit model of earthing device (ED) [13, 15] and to demonstrate the impact of substation design on the part of the lightning current distributed in the conductors of the illumination system
Summary
Lightning overvoltages perform the most significant impact on requirements for ensuring EMC of at high-voltage substations up to 220 kV. Incorrect selection of SPD parameters and its installation location can lead to damage to protected equipment by lightning current [2,3,4,5,6]. The main parameter determining the SPD class I applicability is an impulse discharge current. Impulse current evaluation methods described in IEC 62305 and 61643 standards [1, 8], do not consider the design characteristics of the power facilities such as developed grounding network and the absence of low-voltage networks extending beyond the ED. The aforecited problems may be the cause of incorrect selection of SPDs parameters at the design stage It has to be noted, that impulse discharge current parameters recommended to test SPD do not consider data published in [9]. An analysis of the processes of distribution lightning current was carried out for the lighting equipment of the floodlight masts located in air insulated substation
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