Hi Mbrooke, davidbeach, rcwilson,
Guys thank you so much for the very fast response to my post. Every idea is very much appreciated and of great help to me.
@ Mbrooke – In my previous plant this was alarm and blocking of other elements only. No tripping.
@ davidbeach – In both installation...
Hi Guys,
I just want ideas on this;
I was previously assigned to power plant where the protection scheme of the Voltage Balance Relay (ANSI 60) was used to block other relays that utilizes voltage (e.g. undervoltage) and issue an alarm. Recently I was transferred to another plant. The...
Thanks everybody. It is now very clear to me that we need to re-evaluate our procedure and request the gradient curve from the manufacturer. We could have not understood this fully without all your help. Thanks to all of you.
To Collies99
Our WTI is AKM Qualitrol, WTI 35 with matching resistance TD50/76
Yes there is a CT and the ratio is 1135/2A. Yes there is a calibration resistor which we adjust for the 1A to 20C during our calibration.
These are the data that could be found on our manual;
1. Winding temp...
Hi DTR2011... Yes, the 30 deg C sensor connection that I mentioned is connected to the top oil temperature sensor during the actual installation. This means that after compensating for the ambient, the total reading would be the top oil temp plus the contribution from the current (via CT) of the...
Our procedure to calibrate our WTI (AKM Qualitrol) is to subject it to a constant temperature say 30 deg C for 10 minutes. After which, we inject 1A for 1 hour and our indication should read 50 deg C. This means that for 1A injection the increase should be 20deg C (based on a given graph)...
