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@all Let me try to give some examples. 1. Develop Model Package for projects like for Standard Size / rating of Substations instead of developing design package for individual projects. The Model Package can include Data Sheets, Technical Specifications, Sizing Calculations, Layout...

Can we have different ideas for cost optimization in Electrical - Engineering, Procurement & Construction (EPC) Works. Electrical works includes Indoor Substation, Power distribution in process and non-process facilities, electrification of roads, buildings, facilities etc. The purpose is to...

For restricted earth fault protection relay for transformer, what Class of current transformers are used. Is it 5 P 10 or class X and why? In the existing system I find Current Transformer Class 5P10 used for REF for Transformer. Thanks in advance.

@Parchie Reference my original message, the total working capacity of Substation is 30MVA x 3 Nos = 90 MVA = 4725 Amperes. Power Factor is maintained at 0.95. 4th Transformer of 30 MVA is hot standby. The Switchgear has 4 Bus sections with 4 Incomers (3 working + 1 hot standby). Now, if we go...

@che12345 The project site location is in Middle East. The substations are air conditioned. The Specifications mentions ''Equipment located inside buildings shall be rated for continuous operation throughout the range of specified ambient temperatures, without regard for the air-conditioning...

@ Parchie 50 degree C

Arrangement of an Existing 11KV Switchgear receiving power from 132KV substation through cables is as follows; Upstream 132KV Substation - 4 Nos. of 132/11 KV 30 MVA Transformers feeding power to 11KV Switchgear at downstream. The configuration is 3 + 1 hot standby, which means all 4...

Looking for some reliable website which provides ''Electrical Design Calculations - based on IEC / IEEE Standards'' in excel format preferably for: Earthing calculations, cable sizing calculations, Lighting calculations, Transformer sizing, etc. Kindly help by providing web link.

Handbook of Electrical Engineering for Practitioners in the Oil, Gas & Petrochemical Industry by Alan L. Sheldrake. The book in general provides good design concepts.

If inductive reactance is used for earthing, does it cause resonant inductive-capacitive over voltages. Is it because of this reason solid earthing is used upto and including 3.3kV.

In our Project we have On-site Power Generation with no "State Grid" Connection. On-site Power Generation is by 2 nos. of 3.3kV, 2000kVA, 50Hz Diesel Generators operating in parallel and 3rd Diesel Generator of identical rating connected but on standby mode. Earthing system adopted is Solid...

In our Project we have On-site Power Generation with no "State Grid" Connection. Power source is 2 nos. of 3.3kV Diesel Generators operating in parallel and 3rd 3.3kV Generator is connected but on standby mode. My questuion is how Grounding is to be done for 3.3kV Generators oerating in...

dpc (Electrical) Yes, i found the answer after a bit of search and thought to share with all interested.

Reference to my subject question, I would like to share the following, IEC 62305-3: Protection against lightning – Part 3: Physical damage to structures and life hazard Clause : 5.4.1 General ........From the viewpoint of lightning protection, a single integrated structure earth-termination...

In addition to IEC Standard, we can refer to NFPA 780 as well.

I have seen Lightning Protection Earthing grid (electrodes with interconnected conductor system) seperate from Equipment earthing grid without any interconnection. I would like to know Recommended practice as relevant per IEC standard. Are we supposed to interconnect Lighting protection grid...

Thanks everyone for your time and inputs. I have obtained information from Siemens Catalogue that is quite useful, Solkor R & Solkor Rf Pilot Wire Differential Protection Relay (ANSI NO. 87) is suitable for application on a single pair of pilots with loop resistance up to 2000ohms to protect...

Just to recap: the signals between Upstream and downstream Substation at a distance of 11 kms are as, 1. Solkar Pilot Wire for Differential Protection Relay - ANSI NO. 87 2. Inter Trip Send - ANSI NO. 94 3. Inter Trip Receive - ANSI No. 85 4. Upstream Earth Switch Inter lock 5. Upstream...

can the patch panels be housed within MV Switchgear or need a separate enclosure/ panel.

Now the conclusion is to use Fibre Optic Cable. Agreed. To use FO Cable do i need to replace the existing planned multiple core 2.5 sq.mm XLPE/LC/PVC/SWA/PVC WITH FO Cable ONLY or some additional components are required within MV Switchgear Panel or outside it. Thanks