All about PT's
All about PT's
(OP)
Greetings,
We are on the process of upgrading various components on our substations which was built when I wasn't even born. We tried contacting vendors and suppliers for them to recommend a replacement for PT's.They come out with a lot of queries:
1. Location of application - Outdoor type
2. Connection type - Line to ground
3. Secondary voltage - 115 V
4. Ratio - 175
These are the questions that needs clarification from you experts:
1. Accuracy and burden.Highest burden for .3 ACC CL;Thermal rating?
2. Also do you recommend to fuse this or not?
I know this are very basic questions for experts like most of you guys in this forum.But for a newbie like me I need your expert opinion.
By the way our system is 34.5 KV.
Thanks in advance.
We are on the process of upgrading various components on our substations which was built when I wasn't even born. We tried contacting vendors and suppliers for them to recommend a replacement for PT's.They come out with a lot of queries:
1. Location of application - Outdoor type
2. Connection type - Line to ground
3. Secondary voltage - 115 V
4. Ratio - 175
These are the questions that needs clarification from you experts:
1. Accuracy and burden.Highest burden for .3 ACC CL;Thermal rating?
2. Also do you recommend to fuse this or not?
I know this are very basic questions for experts like most of you guys in this forum.But for a newbie like me I need your expert opinion.
By the way our system is 34.5 KV.
Thanks in advance.






RE: All about PT's
We had topic on the issue.
Please see attached thread:
thread238-209138: HV Voltage Transformer - Protection Secondary against Short-Circuits
For the start.
Regards.
Slava
RE: All about PT's
And, many times the systems have changed over the years, pt connections which were used years ago might be better changed during this process which could require relay changeouts as well. Fusing or not depends on what the PT outputs are used for, opinions will range based on utility practices.
RE: All about PT's