Relay Coordination Using Microsoft Excel
Relay Coordination Using Microsoft Excel
(OP)
Hello All,
Can someone point me in the right direction? I would like to electronically plot the coordinated TCC curves for a simple power system. I only need to coordinate three overcurrent devices (Multilin 469, Multilin MIFII, and Multilin 750), all at the same voltage level.
Instead of (a)using expensive power system engineering software (which we don't own and can't justify purchasing) or (b)using the time-honored method of overlaying TCC tracing paper on each relay's TCC curve, is there a way to create a TCC chart electronically using Microsoft Excel?
Thanks in advance for all your help!
Can someone point me in the right direction? I would like to electronically plot the coordinated TCC curves for a simple power system. I only need to coordinate three overcurrent devices (Multilin 469, Multilin MIFII, and Multilin 750), all at the same voltage level.
Instead of (a)using expensive power system engineering software (which we don't own and can't justify purchasing) or (b)using the time-honored method of overlaying TCC tracing paper on each relay's TCC curve, is there a way to create a TCC chart electronically using Microsoft Excel?
Thanks in advance for all your help!






RE: Relay Coordination Using Microsoft Excel
GO PLACIDLY, AMIDST THE NOISE AND HASTE-Desiderata
RE: Relay Coordination Using Microsoft Excel
http://cuky2000.250free.com/Relay1.jpg
2) For Multilin application, download the instruction manual from GE site. For 469 relay sample see page 4-32 of the enclosed link.
ttp://www.g
RE: Relay Coordination Using Microsoft Excel
I already have the TCC tables for the three relays loaded into Excel and can create the curves in an Excel chart. My question is, how can I plot the curves from the three different relays, each with their own different current pickup points in Excel?
Thanks!
RE: Relay Coordination Using Microsoft Excel
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Sometimes I only open my mouth to swap feet...
RE: Relay Coordination Using Microsoft Excel
It contains several more or less standard relay curves, although no (literally) Multilin relays. The user can define new curves.
RE: Relay Coordination Using Microsoft Excel
Make a column for each relay
Use the formulae for standard relays curves to develope tripping time in each of the relay columns using the currents in the first colum
Plot the three relay columns on one graph with the current column as the X axis
Use log/log scale
Easy
RE: Relay Coordination Using Microsoft Excel
RE: Relay Coordination Using Microsoft Excel
With the scatter plot you can choose which column is the x values and which is the y for each curve. If you are using the same time or current points for two or more plots you can use the same column for each.