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Good Day, I'm working on a project where the manual speaks to installing single busbars on the "rearest most connection point". The busbar connections can take two busbars but based on our 1250 amperage for Hawker Seedly Eclipse gear we only need one per phase. My questions pertains to...

Hello All, I recently had a a set of #3/0 Cooling Tower feeders Megged for their resistance. Two of the feeders had meg ohm results in the 1500Mohm range - 2500Meg ohm range. The readings were corrected to 40 degrees and tested at 2000V. One of the feeders (L3 or C phase) had a resistance...

All, Thanks for your helpful comments regarding this issue. From your comments and questions, I have learned a good bit. We did a little more probing and finally got the manufacturer to admit that the problem lies in their control board. Supposedly the power fault problem is one that many of...

Thanks all for your answers to date. Electricpete, The 75sec is basically the run time setpoint in the control sequence that initiates the "Power Fault" condition. The actual "Power Fault" shutdown can only occur when the current drops below 10% FLA on any of the phases. So basically, both...

Hello all, I'm working at a chiller plant and a few of our chillers are shutting down due to a "Power Fault" everyone once in a while. This error message continuously comes on the chiller control panel and according to the manual, it is a protective control circuit measure for the compressor...

electricpete, Soory for the confusion, they aren't actually two different bus but rather two different sides of the bus connected by a tie breaker. I am in the process of monitoring and recording the start-up currents for all chillers. I am yet to see a trip condition where a ground fault is...

Thanks all for your comments on this. Since my last post, I have been collecting some specifics behind the protection. The ground protection is of the residual type with the following settings; 50N/51N CT - 400:5 Phase Protection Settings LDPU - 0.65 (260A) LDT - 20sec Curve I2T SDPU - 7...

Thanks to all for your replies to date. I am attempting to get more information on the equipment that way I can narrow down the subject a little further. This chiller tripping issue has been going on for the last 4yrs. The records for these trip events are non-existent. Most of the info is...

Hello fellow engineers, I work at a Chiller and Refrigeration Plant where we are experiencing Chiller Tripping issues without being able to find the root of the problem. Our York chillers seem to 1st experience a "control power failure" during start up then once they reset the control power...

Thanks to all for the help with this one. I believe that the CT's are permanent ring type. The only way to check the problem out at this point will be to check the CT's and see whats going on. Our PQ monitors are permanent and are connected to terminal blocks. When we go in to fix the...

All, Thanks for the responses to date. The only additional information that I can give since our Generators can not be taken down at this point is that I do not believe shorting blocks exist for this particular gear. Also, there is double-metering going on here where we've identified that the...

Hello, I'm working on a project where we have installed permanent Power Quality meters on 4160V switchgear for a Turbine Generator. The voltages and currents for each phase of the generator are essentially the same except for the current passing through the C-phase which is substantially less...

Thanks all for feed back...I really appreciate the comments and suggestions

Hi all, I am an entry level electrical working on a project to install a high level power quality monitoring system for a steam/chilled water plant which has very critical loads and has been experiencing many unexplained outages. We are looking to install the Encore Dranetz-BMI power quality...