# Electrical MS Excel Spreadsheets (Calculations of cables, voltage drop etc.)

## 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!

 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 .

1. joniel tangapa
Mar 25, 2019

excellent reference it helps a lot.

2. Rajesh
Mar 03, 2019

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?

3. Anil
Jan 16, 2019

Jan 01, 2019

5. Bala
Dec 24, 2018

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

6. NIKUNJ PARMAR
Nov 19, 2018

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

7. subhash
Oct 13, 2018

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

Oct 06, 2018

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

9. LE VUONG
Oct 04, 2018

Thank you a lot for sharing.

10. Vincent
Sep 25, 2018

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??

• khan
Oct 05, 2018

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

11. Qaiser Iqbal
Sep 12, 2018

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

12. Emmanuel
Aug 28, 2018

Very nice of you sir.

13. Nguyễn Hoàng
Aug 01, 2018

Jul 28, 2018

thank you, very useful.

15. samer
Jun 24, 2018

16. samuel.ayalew
Apr 27, 2018

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.

17. SUBRAMANIAN NAMBISAN
Apr 20, 2018

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

Mar 10, 2018

Thank you so very much.

19. Mounir
Feb 17, 2018

Thanks a lot.

20. Prawin
Feb 11, 2018

Thanks a lot. Very Very Helpful

21. Khaled Ellithy
Jan 25, 2018

Excellent

22. Tawa Great
Dec 19, 2017

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

• Emin
Jan 14, 2018

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.

23. ISLAM LIKA
Dec 16, 2017

Hi,

24. ANKUR SENGUPTA
Dec 14, 2017

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

THANKS

25. choi85
Dec 12, 2017

Thanks, very much..

Nov 10, 2017

Thank you.

27. jayaraj.k
Nov 09, 2017

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.

BR
Jayaraj.k

28. Pisit
Oct 21, 2017

Nice solution

29. Atiq
Oct 10, 2017

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

30. Reda Mostafa
Aug 30, 2017

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

31. Carlos Espinoza
Aug 15, 2017

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?

32. Michael
Aug 14, 2017

Thanks… Thumbs Up

33. Mirwais
Aug 05, 2017

Thanks a lot, Very usefull

Jul 17, 2017

Hi. Thanks, very usefull

35. Prosper Kalu
Jul 12, 2017

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.

36. asrizal basir
Jun 21, 2017

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

37. QVN
Jun 17, 2017

Thanks a lot. very useful

38. nabi
Jun 15, 2017

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

39. TOLBA
Jun 10, 2017

thank you very much sir

40. CASIMIRO
May 31, 2017

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.

41. Mohammed AbuRayya
May 10, 2017

Thanks a lot.

42. anand
Apr 12, 2017

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)

43. peter malus
Apr 03, 2017

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

Mar 23, 2017

Thank you you helpful best regard

45. Zorica Popovic
Mar 14, 2017

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

• Faizan
Mar 20, 2017

you are welcome.

46. Tarqiullah
Mar 01, 2017

Thank you of your work in Electric Engineering.

47. hoss
Feb 27, 2017

Hello.

48. ashenafi
Feb 23, 2017

THANK YOU!!!!

49. Hassan
Feb 04, 2017

Thanks a lot

Feb 02, 2017

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.

51. Sridhar
Feb 01, 2017

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

52. Thabiso Boase
Jan 19, 2017

the best site,

53. Ashraf Zaher
Nov 30, 2016

Thank you very much

54. E MARTINEZ
Oct 17, 2016

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

55. mohamed
Sep 26, 2016

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

56. saman
Aug 17, 2016

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

57. Ismaeil
Aug 01, 2016

Thanks

58. Vigneswaran
Jun 24, 2016

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

59. ABDUL QAYYUM
May 12, 2016

DEAR ALL
THANK YOU SO MUCH FOR THIS GREAT WEBSITE AND THESE LINKS
BEST REGARDS
YOURS
ABDUL QAYYUM

60. Pal
May 09, 2016

Sincere thanks and my appreciation to this wonderful forum.

61. mouaz mohamed
Apr 28, 2016

thanks allot , appreciation to this wonderful forum

Apr 25, 2016

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

63. Asst. Prof. Dr. Emad Kamil
Apr 20, 2016

DEAR ALL
THANK YOU SO MUCH FOR THIS GREAT WEBSITE AND THESE LINKS
BEST REGARDS
YOURS

• Pablito Ortega
Sep 14, 2016

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.

64. Bojan Petreski
Mar 26, 2016

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

65. Ricardo
Mar 17, 2016

what is X´mer?

• K P Kesavan Nair
Feb 17, 2017

X’mer is short for Transformer.

66. anwer
Mar 16, 2016

thank u this is very helpful

67. SERGIO sds
Mar 10, 2016

Thanks, very usefull

68. Nasser .M
Mar 03, 2016

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

69. hazir
Jan 11, 2016

It’s amazing thank you so much sir…

70. G UPENDER
Nov 10, 2015

with regards to all of u members

71. Ramzi
Oct 24, 2015

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,

72. Essraa
Aug 30, 2015

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.

73. khaled
Aug 15, 2015

coool,,

thanks a lot they have been useful to me

74. Pankaj Desai
Aug 13, 2015

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

75. Vikas Khengre
Jul 17, 2015

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

76. Bryant
Jul 14, 2015

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

http://wiresizecalculator.net/

77. Harish
Jul 06, 2015

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.

78. @st175
Jun 25, 2015

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?

79. MD.Mohitul Haque
Jun 25, 2015

80. Rami
Jun 23, 2015

81. nikhil
Jun 19, 2015

82. Ravikumar
May 23, 2015

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 .

With Regards,
R.Ravikumar

83. mohamed
Apr 15, 2015

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

Apr 12, 2015

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

85. sathishchowdary
Mar 27, 2015

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

86. Tesfay Gebre
Mar 25, 2015

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?

87. saravanan
Mar 25, 2015

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

Oct 11, 2018

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

88. omar
Mar 04, 2015

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

thanking you

89. Pravin Sawant
Feb 13, 2015

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.

90. Sumit
Feb 13, 2015

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

91. Agustin Laez
Jan 24, 2015

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

92. SM
Jan 17, 2015

It’s Cool!!!

93. Kristoffe Russel Carlos
Jan 09, 2015

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

94. trevor chandass
Dec 26, 2014

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?

95. tommy
Dec 21, 2014

96. Kazem
Dec 10, 2014

Hi
Calculated filter harmonic and filter D teuned
Thank you

97. Md Mosharaf Hossan
Dec 05, 2014

98. Dimitrios Chouliaras
Dec 02, 2014

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

99. kazem
Oct 09, 2014

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

100. mohd azharuddin
Oct 02, 2014

Dear Sir,

thanks

101. VICTOR RAUTA
Aug 26, 2014

Hi guys,
i like the discussions in this wonderful forum.
I AM STILL A STUDENT AND I HOPE TO BENEFIT FROM YOU

102. Nagendra
Aug 18, 2014

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.

103. Mubeen
Aug 18, 2014

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…

Aug 16, 2014

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

105. Shine
Aug 14, 2014

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

106. Mohammed Yousuf A
Aug 14, 2014

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

107. SOLANKI RAJESH
Aug 11, 2014

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

108. Lars
Jul 30, 2014

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

109. HARISH
Jul 29, 2014

Thank you very much sir…..
really really thanks

110. surasitw
Jul 15, 2014

I want Program Calculation .

111. jafari
Jul 12, 2014

you are the best
thank you veryveryveryvery veryveryveryvery much

112. rijvan
Jul 12, 2014

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

I m feel lucky to visit this site

113. sina.ma
Jul 03, 2014

Thank you very very much .

114. dehghani
Jun 29, 2014

Thanks a lot………..

115. shayesteh
Jun 29, 2014

Thank you verryyyyyy mach

116. vivek sharma
Jun 18, 2014

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.

• Edvard
Jun 18, 2014

117. John Lovel
Jun 12, 2014

Really g8t Efforts and Thanks alot.

118. Do Duc Thai
Jun 11, 2014

Thank you very much.

119. sun
Jun 08, 2014

required 132 KV transmission losses calculations

120. Jermaine
Jun 07, 2014

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

121. NOEL MENDOZA
Jun 04, 2014

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

122. sudhir
Jun 03, 2014

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

May 20, 2014

good information

124. ZISHAN
May 17, 2014

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

125. Harrison U. S
May 04, 2014

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.

126. DESSIE MELESE
Apr 07, 2014

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

127. chris weche
Apr 03, 2014

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

128. Ayo
Mar 25, 2014

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

thanks

129. Prashant Baldawa
Feb 05, 2014

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.

130. aruel
Jan 26, 2014

God bless!

131. A.shiraj Ahamed
Jan 10, 2014

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

132. umut
Jan 08, 2014

• Edvard
Jan 08, 2014

Jan 03, 2014

Pls, share…..!

134. Ronald
Jan 03, 2014

Dear Sir,

how to down load this?? thanks

Regards
R.I

135. Ramnik
Dec 15, 2013

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

• Edvard
Dec 15, 2013

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.

• Ramnik
Dec 15, 2013

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

• satish korgaonakar
Jan 01, 2014

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

136. B.MANJUNATH
Dec 12, 2013

Dear sir,

• Edvard
Dec 12, 2013

137. Romel Bacay
Dec 11, 2013

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

138. S S A
Dec 11, 2013

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

139. Pankaj Rane
Dec 05, 2013

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

140. Arulanandan S
Dec 04, 2013

141. pd1986
Nov 29, 2013

142. oynotna
Oct 25, 2013

Salute!

143. keshrimohit38
Oct 09, 2013

Awesome… Hats off to all of them … :)

144. shergill
Oct 06, 2013

145. mk_sanaye
Sep 27, 2013

146. IMI
Sep 17, 2013

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

147. Rukhsar Ali
Sep 08, 2013

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

148. quochuy
Sep 04, 2013

Thank you very much for your help…

149. sivapacr
Aug 22, 2013

Thanx a lot sir for the great work.

Aug 14, 2013

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

151. trinhminhnhat
Aug 10, 2013

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

152. aakifnouman
Jul 23, 2013

You made the life easy thankyou

153. afk
Jul 20, 2013

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

154. Abdelrazek
Jul 12, 2013

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.

155. sat07babu
Jul 09, 2013

nice work congrats ….

156. THIAGO
Jul 04, 2013

Awesome!

Thanks and congratulations for the excelent work!

157. rahul chauhan
Jun 29, 2013

thanks

158. lahti
Jun 27, 2013

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

159. Mandy
Jun 27, 2013

this is wonderful!

160. mycandy
Jun 15, 2013

Many thank to you!

161. pnp
Jun 03, 2013

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

162. BAMBAA
May 31, 2013

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

163. Franklyne Dhayalan
May 31, 2013

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?

164. lasser56
May 09, 2013

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?

165. Kevin Felix
Apr 18, 2013

166. aleskndr
Apr 05, 2013

Mar 12, 2013

168. tarekdia
Dec 23, 2012

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

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

169. roel
Dec 08, 2012

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

170. ali1980
Nov 27, 2012

Thanks, very usefull

171. psrpskumar
Nov 26, 2012

thankyou very usefull for me

172. cmurugan-design
Nov 15, 2012

Pls post current transformer design xlx

173. m0Handaznelson
Nov 01, 2012

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

174. mohamed Iqbal
Oct 31, 2012

THANS VERY HELP FULL

175. akira
Sep 19, 2012

Sincere thanks and appreciation to this wonderful forum