Manufacturing Process of Current Transformer

8/18/2019 Manufacturing Process of Current Transformer

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MANUFACTURING PROCESS OF CURRENT TRANSFORMER (LIVE TANK)

First of all, Aluminium rod is used as shown below:


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Paper insulation and Aluminium foil is wrapped one over another as perdesign with the help of CNC machine as shown below :


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Now for making secondary winding, following material circular in shapeis used.


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Over this part, white paper and copper coil wrapping is done.


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Copper coil is wrapped over white paper and secondary tapping is takenout as per design which is shown as under:


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Now to enclose above part, one metal part called girt is used as shown below:


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Now the complete secondary winding assembly look like as under withthe secondary winding terminals taken out as shown:


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Now both the aluminium rod (Bushing) and the above secondary windingassembly will join and complete wrapping is done over the joint to givethe fig as below. Now these are put in oven to remove moisture frominsulation paper :


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The secondary winding terminal is taken to bottom part as shown in fig:


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For CY point, one lead is taken directly from aluminium rod (from bottom hole as shown above) such that it can calculate Capacitance ofwhole CT.

Cx and CY point is taken as shown below:


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At the end both the points are taken out to secondary terminals as shown below:


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2.) Tan-Delta Point:- Epoxy block is inserted at the end of aluminium rod and from that two

leads are taken out to the secondary terminal box which is termed as tandelta point.

Below fig shown these points in secondary terminal box.

H ow Auxil iary core is connected??

Auxiliary core is inserted in measuring core in order to saturate CT fasterif load current is increased to avoid damaging the connected measuringequipment.

Below fig shown the auxiliary core and connection for the same is alsoshown.


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Below fig show the disassembled part in which top portion of CT is placed.


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After doing proper welding, it look like as below fig:


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The below insulator are used to cover the bushing portion of CT. weldedto the primary winding part


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These two portions are welded to give complete CT assembly as shown below:


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Complete assembly look like as under:


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Different sections of secondary terminal box are available and as perdesign these are fixed to the bottom part of CT:

Below fig is the Primary terminal of CT


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The primary terminal connector is inserted through middle portion ofsecondary winding and stainless steel bellow is placed at top of CT andafter doing oil filling, final CT look like as shown below:

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Manufacturing Process of Current Transformer