Time Dial Setting
Time Dial Setting
(OP)
Greetings
In the attached image I have set the time dial as 3 for the chiller relay curve. In Order to keep the Transformer curve (Transformer which is feeding this chiller), I have kept the time dial above the Chiller's. But the problem is that the settings I got from utility, the time dial is 0.65 for that. If I reduce the time dial for chiller, the curve comes below and to the left of starting curve.
How I can move the curve up and down with reduced time dial.I tried it with "Time Multiplier" but for any value other then 1 It takes the current markers out of TCC.
In the attached image I have set the time dial as 3 for the chiller relay curve. In Order to keep the Transformer curve (Transformer which is feeding this chiller), I have kept the time dial above the Chiller's. But the problem is that the settings I got from utility, the time dial is 0.65 for that. If I reduce the time dial for chiller, the curve comes below and to the left of starting curve.
How I can move the curve up and down with reduced time dial.I tried it with "Time Multiplier" but for any value other then 1 It takes the current markers out of TCC.






RE: Time Dial Setting
Why is the utility providing this curve? Is this the curve they are using, or one they are expecting you to use?
Did you look at different familys of curves?
Is there a problem with your software?
What relay are we looking at?
We need more information.
RE: Time Dial Setting
After I completed this study, I received the settings of incoming utility feeders. I am OK with the current setting of the Utility, but due to Time Dial of 0.65 for SEPAM1000 relay, the utility curve is below my Transformer 13.8kV side relay curve. What I should do to manage this?
RE: Time Dial Setting
The theory is that you have several transformers and load deversity. Or said another way, you won't have all your loads, or inrush conditions at the same time.
This condition becomes worse when devices are over sized with protection to match the device and not the real load expectation.
RE: Time Dial Setting
RE: Time Dial Setting
Secondly, In one of the document, I have, they recommend the type of curve for the equipments, e.g for Transformer they recommend Very inverse Curve. Does it really depends on the type of equipment or we can choose any type of curve?