## Electrical tools (MS Excel Spreadsheets)

This section is dedicated to tools **every electrical engineer can use in daily work**. These spreadsheets below will make your job much more easier, alowing you to shorten the time used for endless calculations of cables, voltage drop, various selections of circuit breakers, capacitors, cable size and so on.

Spreadsheets are mostly developed by expirienced electrical engineers and programmers (thank you mr. Jignesh Parmar!) and by well known manufacturers of electrical equipment. They all really did an awesome job, you must admit!

Just to mention that all calculation spreadsheets are **free** for download! ;)

Electrical calculations (MS Excel Spreadsheets) | Download | |

Motor Starting Calculation Spreadsheet (by Hemant Kashikar) | . | |

Cable Designing Program | . | |

Calculate Home Electrical Load & Electrical Bill | . | |

Calculate Bus Bar Size and Voltage Drop | . | |

Calculate Electrical Load and Energy Consumption of Panel | . | |

Calculate Electrical Load of Panel | . | |

Calculate Insulation Resistance Value | . | |

Calculate Number of Lighting Fittings and Lumen Output | . | |

Calculate Size of Battery Bank and Inverter | . | |

Calculate Size of Solar Panel, Battery Bank and Inverter | . | |

Circuit Breaker Tripping Settings | . | |

Conduit Size Selection Program | . | |

Design of Earthing Mat for Sub-Station | . | |

Selection of MCCB, ELCB For Main-Branch Circuit | . | |

Selection of fuse and setting of instant short circuit tripping of CB | . | |

Short Circuit Current Calculation at Various Point of Electrical Circuits (Isc) | . | |

Size of Capacitor For Power Factor Improvements | . | |

Fault Current Calculation | . | |

Electrical Safety Program Arc Flash Calculator | . | |

E-Feeder and Cable Calculator | . | |

SquareD – Selecting capacitor size | . | |

Voltage Drop Calculator – Albany Technical College | . | |

Cable size calculations based on motor horse power (HP) and specified current | . | |

Voltage Regulation Percentage of Small Distribution Line | . | |

Calculate size of air conditioning for room | . | |

Residential Load Calculations | . | |

Pump Efficiency Calculation Tool | . | |

Transformer Fault Current Calculation | . | |

Powerline Voltage Drop Calculation | . |

Electrical calculations (MS Excel Spreadsheets) | Download | |

Power Factor Correction Calculation | . | |

Calculation of Touch Voltage and Ground Current | . | |

IDMT (Inverse Definite Minimum Time) Relay Calculation | . | |

Calculate Size of Diesel Generator | . | |

Electrical Pole’s Trasverse Load Calculation | . | |

Electrical Engineering General Formulas | . | |

CO2 Savings Calculator | . | |

Available Fault Current Selective Coordination | . | |

Power Factor Table Calculator | . | |

NEMA Motor Data Calculator | . | |

Estimated Voltage Drop Calculator | . | |

IEC Motor Data Calculator | . | |

Calculation of Size of Transformer, Fuse and Circuit Breaker | . | |

Calculate Size Of DOL and Star-Delta Starter Components | . | |

Calculate size of transformer and voltage due to starting of large size motor | . | |

Power Quality Solution Selection Spreadsheet | . | |

Spreadsheet For Calculating Size Of Motor Pump | . | |

Spreadsheet For Calculation The Required Number Of fixtures And Illuminance Level | . | |

Lightning Protection Risk Assessment Calculator/Spreadsheet | . | |

Load Listing, Calculations and Generator Sizing Spreadsheet | . | |

Spreadsheet for Transformer Losses Calculation | . | |

Motor Voltage Drop Calculator (Spreadsheet) | . | |

Spreadsheet to calculate the size of neutral earthing transformer | . | |

Spreadsheet to Calculate Short Circuit Capacity of Diesel Generator Synchronizing Panel | . | |

Power factor correction calculations for power system | . | |

Distribution Transformer Calculations | . | |

Calculation of electro magnetic field (EMF) around T&D overhead lines | . | |

Earthing system design tool for low voltage installations | . |

DEAR SIR,

I HAVE ONE TECHNICAL QUERY PLAESE I WANT SOLUTION

” AT WELL PAD I WANT TO PROVIDE EARTHING TO METALIC FENCE FENCE L&W IS 180X150 M2.

FAULT CURRENT IS 10 KA. VOLTAGE IS 660V AC, LENGTH FROM STATION TO WELL PAD IS 5KM, CABLE SIZE TO SUPPLUYING 660V AC 24V DC CONVERTER PANEL IS 2CX35 SQ MM CABLE.

I WANT TO KNOW CAN I USE 25SQMM ALUMINIUM CABLE FOR FENCE, POST, MAIN GATE EATRHING.

ELECTRICAL ENGINEERING PORTAL especially to the Author.

Thank you so much for sharing all these tools and documents. These are very important for me especially that I’m teaching college students and doing research also.

Once again, thank you and more power.

Truly yours,

Ellezer Gallon Casiño

Dear all: thanks a lot for all your useful info; that is what we need to work for! The devil is in the details!

Thanks, very usefull

I just love your web site and for a old guy who does estimates and take offs its a great tool. I do have a request. I am being asked by the local AHJ to provide him with a Calc. sheet for a commercial office building where were are replacing (Like as Like) the old FPE panels w/ new updated Sq D. No cables or breakers or circuits are being changed. Just a replacement panel for the old Fed Pacific. He now wants me to do a “load” calc sheet for each office unit, each Panel. Do you have a excel sheet for this Commercial Application? Something simple and easy. The resi one wont work here. Thanks

Steven,

As an AHJ myself, I wonder why he needs a load calc. Are you sure that he didn’t ask for a fault current analysis instead since the older FPE panels didn’t have an AIC rating, so they default to 5kA per the NEC. The new Square D panels would need to be either fully rated for the calculate fault currents at the panel replacement locations or series rated, assuming your local AHJ allows series ratings.

Sorry about the typos above. My cat jumped on my keyboard.

BTW – Replacing a panel with another panel isn’t a like for like replacement, especially for older panels because of the lack of a fault current rating.

Hi,

How to download this template?, I need it.., please.

Thanks.

transformer size-2000kva(11kv/433v)

cable length-150 feets

hv/lv amps-104/2666

we required cable size from transformer to pmcc panel

11kV HT incomer feeder setting: I>>>=INF., I>>=2.5, TI>>=0.65s, IP=0.8, TP=0.25s, IE>>=0.25, TIE>>=0.65s, TEP=0.4s, IEP=0.1

11kV HT outgoing feeder setting: I>>>=INF., I>>=3.0, TI>>=0.3s, IP= 1.0, TP=0.3s, IE>>=0.31, TIE>>=0.15s, TEP=0.1s, IEP=0.1

With above settings, can anybody suggest why incomer feeder tripped during outgoing feeder cable fault ?

good work gives good appreciation…….. i like this…….. done a good job thank u

Although I am not an electrical engineer but an electronics on I appriciate your contribution. Some subjects are very similar between the two careers.

Thanks a lot.

great assistance.I have downloaded a few of the spreadsheet. hopefully they serve the intended purpose. great work nevertheless

hi

please send me the password

They are so helpful. Can you please make one for vector group calculations. It must be able to draw the grouping as you put the figures on the spreadsheet.

on the spreadsheet for the calculation of “Load Listing, Calculations & Generator Sizing” why is the default voltage 400 volts rather than the residential voltage of 240 volts? It would be a more useful spreadsheet if you can actually size the loads for a residential home. Thanks, John

Dear Sir,

we need a Dc cable Calculator for find out the size of cable for varies DC motor or invertor.

dear your are doing good job for preparing such excel sheet.

I am requested to prepare excel sheet for calculating per unit value for common base particularly 100 MVA base for transformer, transmission line for all conductors. generators

Thank You very much. Your article is of great help to me as an electrical engineer. It will surely boost my electrical strength.

can you plz upload a sheet that contains calculation of energy savings by correcting the harmonics in the system

Thank you for sharing these tools for calculations, they are very helpful.

Thank You EEP

Its very useful

its very good

where is download link

thanks

Thankyou very much, so great.

Very useful. Thank you very much EEP. :) More powers!

Good program

Thank you for all these incredible calculation sheets. Really welcome!

Great job. Thank you a lot for sharing.

These sheets are fabulous. An ample list of topics for calculations have been covered. It shall of great use to electrical engineer.

Thanks a lot for sharing these resources and that to free of cost.

Appreciate efforts of all involved !!!

Great work please tell us passwords of the sheets so we also can work for improvisation

Dear Team,

Have a nice day.

I have found a lot of valuable spreadsheets on your portal. It’s really a blessing that peoples like you doing a great job.

Would you please confirm me that upto which extent these spread sheets are correct so that I may apply these spread sheets directly to my practical field work with 100 percent of mind satisfaction.

Best Regards,

Naveed Bashir.

I & C Engineer.

This is simply amazing! Thank you so much.

Sea of info. Great work !!!

Good initiative, keep it up

excellent reference it helps a lot.

what is direction of fault current on radial MV feeder (11kV) how earth fault or overcurent relay works.

what are the reason for catching of fire during fault?

I am not able to download the excel sheet

i am not able to download the excel sheets

Hi team,

if there is any shortcuts or easy methods in testing commissioning,and how can reduce the commissioning time for particular tests..

Thank you so much for such a great files. these are one of the best tool for electrical systems. keep it up

Best and nice work

keep it up

but a small correction require in cable size calculation ( excel ) sheet in 3.5 X 50 sqmm where the result is wrong

thanks

by subhash from totalsolution.website

Great effort to organize EE info at one place, future target should be to evolve projects group.

regards

Adil

EE

Thank you a lot for sharing.

Firstly, I highly appreciate your contributions. Thank you so much!

Secondly, I have checked all the Excel sheets, I saw that most of them were protected, so I could not see the formulas, which I want to recheck. Can you help me to unlock them??

sir I want to unlock the spreed sheet as most of them were locked and I cant change it according to my use can u give me pas or how to unlock it

These excel worksheets are very useful for design engineers. Thank you for sharing free of cost on purpose knowledge for everyone.

Very nice of you sir.

Thank for your support…

thank you, very useful.

that’s very helpful… great

Thanks a lot this is a great help for professionals and trainers. A real quality work with lots of consideration for fellow professionals in the stream. you are setting a higher example. Once again Thank you very much.

Dear EEP Team,

you are doing a wonderful job by making available such calculations for every day use by practicing engineering professionals, cs nambisan

Thank you so very much.

Thanks a lot.

Thanks a lot. Very Very Helpful

Excellent

Hello team EEP

As a junior power systems engineer, which coding language would advise me to learn among:

PHP

Front-End Web Development

Website Design

Android Development

iOS Development

Python

C#

WordPress

Thank you

Do you know anything about those languages? They are all completely different. Front-End Web development is not even a language; it’s an area, just like distribution systems engineering.

I suggest you research a little bit before asking a question like this.

Hi,

i want to buy a lap top for scada system

Hello sir,

I want to know that, is there any calculation table for transformer firewall protection?

THANKS

Thanks, very much..

Thank you.

Dear All,

I need to give the justification for selected cable 2 Runs of 185 Sq.mm.

this cable selected for transformer solid ground conductor.

Transformer details.

13.8kV/480V

4687 KVA

Z=5.75%

Dyn1 vector group

Whether this cable is sufficient or not. please clarify with calculation.

Thanks in advance

BR

Jayaraj.k

Nice solution

anyone have Siemens software (Starter v 4.3 for Siemens Drive(VFD) G120).please upload anywhere and send me link.

thanks.

Atiq

Have you checked on Siemens’s website?

http://w3.siemens.com/mcms/mc-solutions/en/engineering-software/starter-commissioning-tool/pages/starter-commissioning-tool.aspx

Dear i have already checked on Siemens’s website but cannot register and download.

Please I like to calculate the required number of earth rods for substation mat specially in the preimeter

Thanks in advance

Thanks to Mr. Michal Liszka for the Excel EMF calculation.Do you know if this spreadsheet gives the electrical gradient of the conductors? or with some minor modification of the macro?

Thanks… Thumbs Up

Thanks a lot, Very usefull

Hi. Thanks, very usefull

God is going to bless and keep all the people doing this great work to make this world a more comfortable place. God is also going to help us in Africa to also take part in this great improvements. kudos to you guys.

Hi senior,

I am looking for software for mp920 yaskawa plc,and cable data for programing

We have problem with my machine and we must solve that problem.

Where i am to get the software and cable data to connect to my pc

Tq all

Thanks a lot. very useful

I need Electrical AutoCAD or same software for design of electrical schema please send me link of

thank you very much sir

Thank you very much.. It helps a lot

Do we also computation, for Transformer single phase dry type (consumption with out load).

Some say is negligible but waste of energy.

Thanks a lot.

Please provide EXCEL sheet for following CT calculations

One minute Power Freq. 70 kV & 28 kV withstand voltage (rms),

Lighting Impulse withstand Voltage

System fault level Rated dynamic withstand 62.5 Current (KA rms)

thank you very much. such information is very useful to me as a young electrician.

Thank you you helpful best regard

The best site ever!! Thank You very much for Your effort!!!

you are welcome.

Thank you of your work in Electric Engineering.

Hello.

Thanks a lot for your large Heart to share this useful knowledges.

THANK YOU!!!!

Thanks a lot

I have a doubt that we have a metal chimney of 63.5 mtrs height does we have to install air terminals and horizontal terminals to connect to ground for lightning protection or we can simply connect the chimney base to earth grid.

One of the best knowledge sharing website. Great job by Edvard and his supporting team.

the best site,

Thank you very much

Good day, do you have a spreadsheet to estimate cooling/heating for control panels?

Thanks.

Could you please send to me all sheets because register now not allowed

Thank YOU very much, All of calculation is so Perfect . . .

Thanks

Dear Palmer,

I downloaded some of your excel sheets, but its not opening as I am using MS office 2013, is that a problem or your excel sheets only work with previous version of office. kindly reply.

Thank you ,

Vigneswaran

DEAR ALL

THANK YOU SO MUCH FOR THIS GREAT WEBSITE AND THESE LINKS

BEST REGARDS

YOURS

ABDUL QAYYUM

Sincere thanks and my appreciation to this wonderful forum.

thanks allot , appreciation to this wonderful forum

Thank you so much for the organised sheets. it really is helpful.

DEAR ALL

THANK YOU SO MUCH FOR THIS GREAT WEBSITE AND THESE LINKS

BEST REGARDS

YOURS

EMAD

Sir,

I’am Mr. Lito Ortega, i’m here in New York working to Delco Electric Co. as Electrical Designer. Where are you working now sir Emad. Please reply to my email at litortega@gmail.com.

WOW…. I just love you… there, I said it :-)

thanks!

what is X´mer?

X’mer is short for Transformer.

thank u this is very helpful

Thanks, very usefull

Thank you very match this was really very useful in the engineering design job . ,

It’s amazing thank you so much sir…

with regards to all of u members

Thank you for his wonderful work, they have been useful to me. Is it possible to provide me the password to modify the excel file. Regards,

Dear Gents,

I have a project which I need to size a Power Control Center & Transformer for motors load driven through Variable Frequency Drives.

Could you advise how to size the feeders of the PCC for each motor+VFD knowing that each VFD has an overload capability 1.5 times rated current for 60secs.

Thanks in advance.

coool,,

thanks a lot they have been useful to me

Thanking you Mr. Jignesh Parmar and others for sharing wonderful, useful and data sheet and spreadsheet.

Hi,

I need ups sizing Calculator. please mail me if you could provide me.

Your help regarding on this will be very much appreciated.

Regards

Vikas

A quick reference website for wire size and circuit protection calculations:

http://wiresizecalculator.net/

Sir,

This is very HELP FULL for us , I am very Thanks to You sir, I Learned many thing from this site, Thank you so much.

Hi, can you please help me with writing the code for calculating switching losses in an IGBT with unity power factor.I m suppose to use time slicing technique and estimate losses or switch state at 1000 time instants.

Can you help?

This was very helpful,thanks.

Is there a link to download all the spreadsheets, instead of one by one? Thanks

please send me the spreadsheets

Dear Team ,

I am unable to download the cable designing program MS EXCEL Spreadsheet . When I am clicking the above link ,the file is not coming .

Can you pls help me to download .

With Regards,

R.Ravikumar

thanks a lot for this support to my new challenge work :)

I want to CODES/RELEVANT STANDARDS IE, IEC,IEEE & CBIP MANUALS.

Dear Sir, I want how to select relay for a electrical usages.

I really appreciation for your sharing a knowledge us. But I have question how can I access the resource because the MS excel spread sheet is read only?

Dear sir , can you provide me a spreadsheet to calculate harmonic . thank you.

You can find one in ABB site. Just Google harmonic estimator ABB group.

Dears if there Excel spreadsheet to calculate reactors size kindly provide me

thanking you

thanks for sharing … kindly provide the password or keep it open sourced if you really want to share you knowledge.. because it is difficult to get the the formulae behind the calculation.

Hi

I would be very happy if you can work upon and include excel tools for railway electrification engineering and estimation including QS.

Regards

Sumit

Please check the Excel Spreadsheets, Calculate size of transformer and voltage due to starting of large size motor,the cell E33 not working, excuse me english, no is very good.

I speak spanish

Thank

It’s Cool!!!

can you provide me spreadsheet to calculate the sag and span and tension for transmission line please…thank you so much!

can you please provide a calculator to size transformers where three single phase transformers are used to create a full three phase or open delta bank with the measured phase load current as the inputs?

please sent for me password unprotect file excel if can

Hi

Calculated filter harmonic and filter D teuned

Thank you

How i wll be able download excell sheeet

hello guys, im interested in calculate proper diesel generators for industrial projects

Hi, thanks for the very good Excel files to calculate file requests Series Inductors which are industrial drives

Dear Sir,

i am working on calculating Rct of current transformer please help me how to calculate this

thanks

Hi guys,

i like the discussions in this wonderful forum.

I AM STILL A STUDENT AND I HOPE TO BENEFIT FROM YOU

I need the methods to calculate and select the proper size of XLPE cable for high voltage system. Can anybody help me providing the spreadsheet to select the proper size of XLPE cable for High voltage like (11-33-66-132kV) system.

Hi.. I m trying to download MSCEXCEL spreadsheets on my android phone but it struck on box page and nothing happens when I press download button .. I also have installed box app but not working…

I am interested in electrical software/ CD file designing for MV/LV circuits. can you guide me on that?

I want Program Calculation for ups sizing…and ups spread sheet…

Great job Mr Parmar, very helpful information in the site. nice….

I NEED MONTHLY,DAILY Grid Availability – Seet plz help me

Very nice spreadsheets. Anyone got one for calculating generator incomer CT?

Thank you very much sir…..

really really thanks

I want Program Calculation .

you are the best

thank you veryveryveryvery veryveryveryvery much

I ll recomend this site for all engineer who never stop learning..

I m feel lucky to visit this site

Thank you very very much .

Thanks a lot………..

Thank you verryyyyyy mach

I want to add some excel tools which can be useful in numerical relay testing. such as Delta connection counting, unbalance (NPS, PPS, ZPS) counting, all type power & energy calculations etc.

Great Vivek! You can send your spreadsheets to office/AT/electrical-engineering-portal.com.

Really g8t Efforts and Thanks alot.

Please give us the password to use these tools.

Thank you very much.

hi Do Duc Thai

can you send me password of excel files?

required 132 KV transmission losses calculations

Let us know if you are still looking for the same.

This is a wonderful and very helpful thing that you have done. Do you have plans to do a medium voltage motor calculation sheet?

Im very glad tha you post this helpful and very usefull computation

great content for electrical engineers, please remove the protection for the files, we want to utilize it

good information

All the excel sheets are password protected. How to remove the password

I really wanna appreciate your support and help to electrical engineers all over the globe, your really a great source of help cos much time have been saved with the help of your spreadsheets. I wanna say thanks and heaven blesses you guys real good.

I am Electrical engineer in Ethiopia. My interest is to be the member of number one 1 Electrical engineer in the world.

YOU GUY(S) ARE GOD-SENT,YOU ARE A BLESSING TO THE UNIVERSE.MAY THE ALMIGHTY GOD GRAND U FAVOUR IN UR ENDEVOURS TOO.

You guys have really done a good job. Having these spreadsheet handy for a rough estimate saves time a lot.

thanks

Thanks EEP. Your articles are worth reading. Simple yet an insite to a many technical facts which we deal with on conitnual basis.

Do you have any article on the autosnchronization scheme and its advantages/disadvantages.

Thanks in advance.

Thanks EEP for your generosity! I got all the spreadsheets almost 45 for free. a very helpful docs.

God bless!

I can’t download this software. But this is very important and very useful for all technical persons

İ cant download it

Please elaborate… cannot help according to ‘I cant download it’ ;)

Pls, share…..!

Dear Sir,

how to down load this?? thanks

Regards

R.I

could not use the Home Electrical Bill / Energy Consumption / Load Calculator

it requires password the cells are protected. Can you send me the password PLEASE!

You can use this spreadsheet without any problem, but if you want to edit formulas and unlock the cells, you will have to purchase this spreadsheet.

but sir i cannot edit the “total electrical load” cell…

plz help

Any spead sheet which we downloads from this website ask for password , You replied we need to purchase the same , so tell me wats the price n wats is the procedure to do the same

Dear sir,

Please help me sir i am not able to download the Excel sheet details like voltage drop calculation, elrctrical formulad etc.,

Everything is available for free download, I don’t see any problem ;)

Its awesome. Thank you very much for the references ..Pls. dont be sate to share your knowledge. Go will bless you.

Please include the checklist for installation of electrical items (DBs/ Panels / Transformers / DG/ ACB etc)

It’s really very helpful , thanks a ton!!!!

not available for down loading

files are not downloading from mobile please help

Salute!

Awesome… Hats off to all of them … :)

what is the password sir

the information and softwares are really usefull but download links in http://www.box.com doesn’t work correctly and server doesn’t respond, please correct them

thanks for your efforts

Very important information that to free. May ALLAH (There is no god but allah) bless you.

Its my pleasure to be here & i am thankful to you for sharing such information.

Its too much helpful

Thank you very much for your help…

Thanx a lot sir for the great work.

Thank you very much for your efforts, it’s really nice job,

thanks so much for ur non-profit work!im grateful for that and dont know how to give a thanks!:(

You made the life easy thankyou

Suggest any method to design and sizing of control/switch gear panels.

Dear Sir;;

thank you very much for your efforts, it’s really nice job,

but I want to ask you to put the standards you have used, and pls put the full meanings of the abbreviations you have used.

nice work congrats ….

Awesome!

Thanks and congratulations for the excelent work!

thanks

Very nice spreadsheets! Is it possible to make one about 3-phase transformer inrush and aprox. voltage drop caused by inrush?

this is wonderful!

Many thank to you!

nothing more to say…….. a big hug for this help. u r doing a great help to students like me….

HI GUYS, SOMEBODY HELP ME HOW TO COMPUTE MAIN DISTRIBUTION PANEL LOAD SCHEDULE. I WISH SOMEBODY HAVE A SPREADSHEET / XLS TEMPLATE. =)

Thanks for doing a lot of work. It is very good inded.

Could you please clarify if we use chemical earthing ) meaning moisture obsorbing material is filled in around the electrode) will you calculation still be good enough?

hi thanks for all the good tools you guys have come up with. Actually i’m trying to study electrical services design on my own,i got your eplus menuCAD software which i think is a helpful tool. however i still need some step by step guide notes on some basic things i should know. Can you help with any straight to the point books,articles or any literature on electrical services design?

thank you and i’ll appreciate any help you give

Can someone tell me how to download Electrical MS Excel Spreadsheet.

You must register and download links will be visible. Go ahead and register here:

https://electrical-engineering-portal.com/wp-login.php?action=register

and then login here:

https://electrical-engineering-portal.com/wp-login.php

Hope this helps a little bit ;)

Edvard

can you brief about relay coordination study and send me example calculation

please how can i download

could you please tell me how to download these spreadsheets

this is a test format for 13.8 kv switchgear

1. GENERAL DATA AND INFORMATION

Panel No : Designation No. : A.Q1

Manufacturer : ABB Rated Voltage : 24 KV

Type No. : VD4/P 24.25.25 Rated Aux. Voltage : 125 VDC

Serial No. : 1VC1AL000 Rated Current : 2300 A

2. MECHANICAL CHECK AND VISUAL INSPECTION

ITEM DESCRIPTION CHECKED

1 Inspect for physical damage / defects.

2 Check nameplate information for correctness

3 Check tightness of all bolt connections

(Torque Wrench)

4 Check racking mechanism for alignment and

Smoothness of operation

5 Check quality of paint work

6 Check proper operation of all mechanical interlocks

7 Check for correct breaker position indications

8 Check for correct spring status indication

9 Check all wiring correctness as per approved drawings

10 Check that all grounding are securely connected

3. ELECTRICAL TESTS

3.1 Function Test.

ITEM DESCRIPTION CHECKED

1 Local control, alarm and indications

2 Remote control, alarm and indications

3 Check correct operation of all auxiliary “a” and “b” switch contacts.

4 Check breaker operation counter

5 Check trip free and anti-pumping circuit

6 Check electrical operation of breaker racking tracks. (interlocks and limit switches).

3.2 Insulation Resistance Measurement:

TEST

VOLTAGE

CONDITION

DURATION

READING (TΩ)

5KV

CB CLOSE: R-Y+B+GROUND

1 MIN

CB CLOSE: Y-R+B+GROUND

1 MIN

CB CLOSE: B-R+Y+GROUND

1 MIN

CB OPEN: R1+Y1+B1-R2+Y2+B2+GROUND

1 MIN

3.3 Contact Resistance Test: Current injected 100A

CONDITION

R-PHASE

(µΩ)

Y-PHASE

(µΩ)

Y-PHASE

(µΩ)

CB CLOSED

Test Kit : Megger & CPC 100

3.4 Breaker Timing Set

TEST

RΦ (in mSec)

YΦ (in mSec)

BΦ (in mSec)

Closing Operation

Closing Coil

Open Operation

Tripping Coil 1

Open Operation

Tripping Coil 2

Test Kit: EGIL

Thanks to all the contributor and developer of this site/forum…very helpful

Thanks, very usefull

thankyou very usefull for me

Pls post current transformer design xlx

Superb! very useful, i learned a lot…thanks…

THANS VERY HELP FULL

Sincere thanks and appreciation to this wonderful forum

do you have a Medium voltage voltage drop calculator excel for over head power line cable?