Delta Electronics VFD037CH23A-21 — обзор систем заземления: TN-C-S и TT [630/638]

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PEN

ConsumerEarth

Generator or

transformer

TN-C-S system

TN-C-S: A combined earth and neutral system (PEN conductor) is used in certain systems but eventually

split up into two separate conductors PE and N. A typical application of combined PEN conductor is from

the substation to the building but within the building PEN is separated into the PE and N conductors.

Direct connection of PE and N conductors to many earthing points at different locations in the field will

reduce the risk of broken neutrals. Therefore this application is also known as protective multiple earthing

(PME) in the UK or as multiple earthed neutral (MEN )in Australia

ConsumerEarth

Generator or

transformer

TT system

TT: The neutral point (N) of the low voltage transformer and the equipment frames (PE) are connected to

a separate earthing point. The Neutral (N) of the transformer and electrical equipment are connected.