Wiring diagrams counter through current transformers

We are all familiar with the direct connection of meters. After all, a lot of single-phase and three-phase meters in the private sector is well connected. But in case, if the power consumption exceeds the figure of 100 Amps, the direct incorporation will not work. In such cases, the metering device is connected via a current transformer.

In this material the most common I show connection diagrams of energy meters through current transformers and voltage transformers.

Wiring three-phase electricity meter three CT (current transformer) and three VT (voltage transformer).

The designation TH1-TH3 refers voltage transformers, and accordingly TT1-TT3 - This current transformers. Also look at the dotted notation, so it seemed a common point grounding transformer, which is performed in order to ensure safety, but it may also be absent.

Scheme attachment phase through three counter CT

In this diagram, the broken lines indicate also a compound which may not be.

Scheme counter compound using two current transformers

Driving connection counter after a couple of three current transformers and voltage transformers

Scheme accession metering device through two TT and two VTs

conclusions

The above are the most common scheme of metering devices joining were given. But I would like also to remind you that the overwhelming number of metering devices (directly on the cover or in the passport) is present wiring diagram.

Another important to note that the circuits of copper wires mounted with a minimum cross section of 2.5 square, and the permissible voltage circuit to perform wire section of 1.5 square. And use aluminum is strictly prohibited.

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Thanks for attention!