transformer type

[former_member427661]

Dears,

I have an issue while creating winding groups, I am confused between low voltage current transformer, current transformer, and current transformer: low/ medium voltage,,,, when to use each type...

I have transformers that have primary and secondary current,,, some of them will be created in groups together (only transformers contain currents) and some of them will be created in groups with voltage transformers..

what should be the type of the winding groups, and the type of the device groups

[ricky_shaw]

Hi Heb,

You got to create a winding group with transformer type: Combination transformer(Current & Voltage) and mention the Tr.Voltage & T.Current columns with relevant values in the Winding data table.

On the Device category you got to set the type of measurement as '1'(Indirect) or '3' (semi/indirect) for measurements.

[former_member427661]

Hello Ricky,

thank you for the answer....

the issue here is that some transformers have only currents,, and some have only voltages, and some have both (current and voltage together)..

moreover, these transformers need to be installed together as groups, with various combinations (only current transformers, and sometime current and voltage transformers).

my issue is when to use each winding group type (0 or 2 or 6, as all of them allow maintaining current values), and in that case how i am going to use the devices having these winding in the groups mentioned above...

[narasimha_ms4]

Hi Heb

For Device categories with semi indirect method we must use a Transformer with winding group created for low Voltage Current transformer because here the load voltage and rated voltage of meter are same only current is issue , we need a step down transformer which can transform load current example 200 amps to Meter rated current as 10 amps . we need winding group with only Primary 200 amps and Secondary windings as 10 amps

For device categories with indirect method of measurement we need transformer with winding group containing only and primary and secondary Voltages

For device categories with semi indirect and indirect method we require both primary voltages , primary currents and secondary voltage and current in winding group

Also which meter is to be used depends on prevailing load voltages and currents and ratings of meters