Construction

Protection of Electrical Networks by Christophe Prévé

By Christophe Prévé

This booklet, designed for engineers, technicians, designers and operators operating with electric networks, comprises theoretical and useful info at the layout and set-up of safeguard structures. safety of electric Networks first discusses community buildings and grounding platforms including difficulties that could happen in networks. It is going directly to conceal present and voltage transformers, defense features, circuit breakers and fuses. functional causes of ways safeguard platforms functionality are given, and those, including tables of settings, make this publication compatible for any reader, regardless of their preliminary point of information.

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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.

5, directional earth fault protection for compensated neutral systems). – Risk of ferro-resonance. 68 Protection of Electrical Networks Problem of resistance earthing when several transformers operate in parallel on one busbar Case 1: Each transformer has a non-disconnectable earthing resistor. The earth fault current varies according to the number of transformers in service (see Figure 2-8a), which may pose difficulties for the motors or for setting the threshold of earth fault protection devices.

Requires earthing connections to be evenly placed in the installation so that the protective conductor remains at the same potential as the earth. 2. Comparison of different medium voltage earthing systems The various earthing systems in medium voltage systems are different in the way they operate and each has its advantages and disadvantages, which we shall now consider. 1. Direct earthing (see Table 2-1(a)) Operating technique: – Compulsory switching on occurrence of the first insulation fault.

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