Recent content by vreijb

I came across an air circuit breaker installed on main LV switchgear. The breaker type is CN2 4000A with trip unit as NLG. As the breaker is discontinued, I am not able to find any details online. Appreciate if anyone has any information about the breaker trip characteristic to use in ETAP module

Thanks. I have transformers 0.6/120-240V 25KVA, 37.5KVA, 50KVA, & 75KVA. The IE values are not practical with ETAP results. ETAP is selected for single phase calculation method. I presume they use equivalent formulas. If I use transformer secondary fuses, then I can get more logical results. The...

I am performing Arc Flash for a plant with many small 15,25,27.5,50KVA center tapped transformers feeding LV Panelboards. The result from the Arc Flash Calculations are very High and probably not practical. Is there assumptions made in this situations similar to LV 3-Phase system Like for...

It is section 1 and 3 professional exam which is mainly related to the engineering profession and law in Quebec and related.

I am licensed in Ontario as EE. I have to perform a job in Quebec and for that I will need Permit to work as engineer from OIQ, Quebec. As per OIQ, I can get temporary license for specific job, but I have to pass professional exam, for which they don't have any english study material, although...

Not really in this case. I got Fluke Technical support recommendation to use Delta. I got feedback from experienced technician to use Y-IT.

I have worked on current impression systems for oil storage tanks to protect the bottom. there are 2 ways that I have worked with. one method is you use deep-well anode away from the concrete. You install anodes in the deep well, usually there will be anodes at different levels through a chain...

Thanks. If you measure a panel with 3 phase 3 wire, which connection to be made? Delta or Y IT on the fluke. I guess both should work.

I would like to know if I need to change the fluke 435 default current Range 3000A to be close to load current or keep as is to start measurement as the manual suggest. The panel I will connect has total load of 100A.

We have separate Z Transformer for neutral earthing. The client is asking ZNyn11 Transformer to reduce the gorund fault on low voltage side

What's the advantage of using auxiliary transformers ZNyn11 over Dyn11 (750KVA 11x.4KV) Thanks

The transformer HV side CTs at SWG are 500/5A and LV side at TR are 800/1A. The Transformer is 5MVA 7.2x4.16KV. Can the CTs be used for differential protection without interposing relays with GE 745

I have worked most of the time in persian gulf and in oil and gas projects. We always considered: single pair cables with shield for analog and digital signals multipair cables with individual and overall shield for analog signals multipair cable with overall shield for digital signals I am new...

Anyone can give input about specifying instrument cables for power plants. The cables will be for: -Analog input 4-20mA or RTD -Digital Input/output -Input/Output cables from Swicthgear to PLC for control and monitoring I am looking specifically whether to provide shield on Digital input/output...

what about overvoltage factors 1.5 for 8H, 1.9 for 30min, and 1.2 cont. doesn't mean anything knowing we will trip in case of earth fault.