Nowadays electricity has appaered in all part of life, its utilization is extensive. However we sense its importance principally when it becomes attainable or it is no more. In many cases it is inadmissible so the smooth working, the stability of service is a very significant aspect. As temporarily electricity can not be stored in eligible quantities, it must be generated constantly depending on the consumer demand.
But it is only possible with equipments which are reliable, their failures can be foreseen and we can perform maintenance if needed. In order to estimate the condition of appliances we need to make diagnostics on them. These inspections are non-destructives and performed on the spot most of the time, therefore the duration of the equipment’s loss can be reduced.
Naturally a lot of apparatus take part in producing electricity (e.g. power plant generator, transformer, substation equipments, transmission line). I introduce the diagnostics of distribution network substation equipments. During the summer in the course of field measuring I got acquainted with the different diagnostic techniques and the construction and equipments of substations.
In the first part of my thesis I try to introduce the structure and the function of substations. In the third chapter I talk about transformers’ properties particularly because from my experience the most of inspections aim at discovering these devices’ condition. Then I show the measuring method of substation earthing grid’s spreading resistance. In the last section I evaluate results of inspections where I was at the implementation of some of them. The object I propose to myself is to show the applicability of diagnostic mehods by representative troubles.