davidbeach,
What would be the most appropriate method to allocate the line and transformer losses back down the line to the difference sources?
Proportion of I^2s for both KW and KVAR losses?
Proportion of KW^2s value for KW Losses?
Proportion of KVAR^2 values for KVAR Losses?
Function of KVA...
Bacon4life, (BTW nice handle [bigsmile])
Thank you for your reply. I have replied to your comments and question below. With that said, do you have thoughts/suggestions on allocation methods for KW and KVAR losses using combinations of Current, KVA, PF, KW and KVAR from each meter?
The...
I am looking for ideas to have a relatively inexpensive and simple hardware device that can be sent to the field to test an Ethernet port for proper TCP port connection rights.
Application is to pre-test and verify router, switch and firewall rules have been properly setup for a device, with...
Looking for advice and recommendations on properly allocating KW and KVAR losses across multiple transformers sharing a transmission line and then further allocate each transformer line loss share to its related resources/feeders under each transformer.
Assumptions -
1. Three transformers...
I’ve watch several Two-Wattmeter Method videos, including this series (3 parts starting with this one) and I have some questions to take the topic a bit farther and to better understand the vectors, specifically when CTs and PTs are in the mix. Furthermore, my confusion and frustration relates...
I used to use an HP41C calculator years ago. I am now studying to take PE and dusting off my RPN skills with a HP35S (NCEES approved). Can anyone tell me the pros/cons of using equations versus programs; when best to use either method? Also, does anyone have a good resource of POWER equations...
argotier or others with knowledge,
Additional follow-up questions. Thanks in advance for your time.
Based on calculations in previous posts and summarized here:
- Current with 2.0 MVA, 1 Ω NGR = 8000 V / (22.9 Ω / 4 / 3 + 1 Ω) = 2750 A = ~2.8kA
- Current with 4 x 0.5 MVA banks, with 4 Ω...
argotier, Thank you for your time on this. A few follow up questions.
1. Based on the calculated parameters of the resistors (1Ω @ ~2.8kA-10s & 4Ω @ ~700A-10s), what experience do you have with similar sized resistors being implemented GTs for such projects? Wondering what is economically...
Need help with help with NGR rating for Option#1 re: EPRI Technical Brief_Effective Grounding and Inverter-Based Generation. How to properly calculate current through NGR when connected to neutral of Wye winding of Wye-g/delta(not a zig-zag) grounding transformer. What is valid impedance model...
I have a wind farm generation & tie-meter design where the meter location is at a wind farm and the point-of delivery for LBA and PPA settlements is several miles down a radial 345kV transmission line (at bus of transco). A few loss compensation questions have come up. Line loss only, no...
Scottf,
I am working on anglicizing that data; unfortunately the existing legacy meter installation does not provide real-time SCADA Amps or MW values (the MW are read by separate transducer, also 2-element) values. I have only done a snap shot of relay amps & MW at the same time as meter...
stevenal, Thanks for the response. While I agree with you about not needing the aux PTs, I am still trying to get two (2) internal parties to concur with this assessment. I wish I were more effective at overlaying the vectors on this diagram to prove the point.
Regarding the CTs and...
stevenal,
Sorry for the bad link. Attached is another try as a JPEG. Hopefully it works this time.
Again, just for simplicity of diagram, the two (2) metering CTs are not shown but they are on 161kV Phase A & C...
1) Added another representative diagram. (Note: for simplicity the CTs are not shown but there are two (2) dedicated CTs for phases A and C to the meter.)
With the SEL73X meter setup as Form 5, it is believed that we need Aux PTs to shift the voltage angles to line up and work with the Form 5...
Thanks for the replies.
The meter is on the wye-grounded side of power transformer
CTs are on A & C
Bus PTs provides voltages for A, B & C
PT secondary wired to meter as A-element-B-element-C
Some similar sub meter applications applications have B bonded, some don't.
(For visual reference. See...
I am replacing a older Form 45S (Elite) meter with a Form 5S (SEL734/5) type meter in a 69kV substation using SEL's recommended Form 5 wiring method.
The application is measuring power on a wye-grounded side of transformer. The meter has two (2) dedicated CTs. There are three (3) PTs...
