Open AccessCOOLING TIME OF ELECTRICAL ENGINERRING SYSTEM ELEMENT AFTER SHORT CIRCUIT IN DISTRIBUTION NETWORK OF THE SHIP REPAIR PLANT
Author(s) -
Aleksej Vladimirovich Melikov,
Natalya Mikhailovna Veselova,
D D Nekhoroshev
Publication year - 2018
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta. seriâ: morskaâ tehnika i tehnologiâ
Language(s) - English
Resource type - Journals
eISSN - 2225-0352
pISSN - 2073-1574
DOI - 10.24143/2073-1574-2018-4-115-124
Subject(s) - electrical engineering , earthing system , ground , line (geometry) , engineering , power (physics) , power cable , water cooling , direct buried cable , fault (geology) , electrical network , electronic circuit , voltage , current (fluid) , short circuit , mechanical engineering , cable harness , materials science , geology , physics , cable theory , geometry , mathematics , layer (electronics) , quantum mechanics , cable gland , seismology , composite material
In the event of a short circuit in the element of electrical system of distribution network of the ship repair plant, the current passes through the cable core; further, it goes through the fault site into the screen and its grounding devices. The protection gets activated and cuts off the line. The cable is heated up to 250°С when the short-circuit current passes along its intact segment. After eliminating the accident caused by short-circuit current the line is re-connected to the network, but only if the cable is cooled to a temperature of 60°С. In this regard, there arises the problem how to determine the cooling time of an element of an electrical system after a short circuit. The article presents the step-by-step calculation of time after which it is possible to recycle a single cable lying underground at a certain temperature of the environment. As an example, there has been chosen a power cable of ABC type that is most often used when laying wiring in the ground. The main purpose of the chosen cable is to transmit electric power in electric lines with operational power 1.6 and 10kV. There has been developed the program for automatic definition of the cable cooling time after a short circuit. It will be useful for the thermal calculation of both a single cable laid in the ground and for several elements of the electrical system in distribution network of the ship repair plant. The program is based upon procedural programming, each procedure being a certain step in solving the problem. It has been proved that input of initial data takes much less time than efforts to solve the problem in-situ. Using the program doesn’t require special skills.