Info required for VDG relay

[WvH]

Hi,

I have to interpret the test results of a VDG13 undervoltage relay and would like to know:
1) Does it operate on a Very Inverse curve like a CDG13 relay?
2) If so, how does the formula differs from 13.5*TM/(PSM-1)?
3) If not, what curve does it operate on?

Waldo

 

[DiscoP]

It's curve is very different to the CDG13 relay.

You should contact ALSTOM for a copy of the publication, it contains the curve it uses.

Also, you should be made aware that the formula you have stated is not correct for a CDG13. This formula is used for Electronic relays like the MCGG.

 

[WvH]

Thanks, much appreciated