By Christophe Prévé
This publication, designed for engineers, technicians, designers and operators operating with electric networks, includes theoretical and functional details at the layout and set-up of safeguard structures. safeguard of electric Networks first discusses community buildings and grounding structures including difficulties that could ensue in networks. It is going directly to conceal present and voltage transformers, safety capabilities, circuit breakers and fuses. useful reasons of the way security platforms functionality are given, and those, including tables of settings, make this ebook appropriate for any reader, without reference to their preliminary point of data.
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Example text
Direct earthing (see Table 2-1(a)) Operating technique: – Compulsory switching on occurrence of the first insulation fault. Advantages: – Reduces the risk of overvoltages occurring. – Authorizes the use of equipment with a normal phase to earth insulating level. Disadvantages: – Compulsory tripping upon occurrence of the first fault. 7) and auxiliary circuits). – The risk for personnel is high while the fault lasts; the touch voltages which develop being high. 6) so that the fault clearance time is not long.
The protective system is complex since it uses logical selectivity, taking into account the position of the switching devices and the state of the different earth fault protection devices. This system is used very little.
Earthing Systems 59 Disadvantages: – Requires maintenance personnel to monitor the system during use. – Requires a good level of network insulation (which means that the network must be broken up if widespread, and that loads with high leakage current must be supplied by insulating transformers). – Tripping checks for two simultaneous faults should be carried out if possible when the network is being designed using calculation, and must be performed during commissioning using measurement. – Overvoltage limiters must be installed.