'Calculated' fields will always be up-to-date since calculations will be run automatically every time when you change the value of any field that is a part of the formula. The 'Abacus Calculated Fields' add-on really makes light work of what.

• Electrical Earthing Calculation

Just to mention that all calculation spreadsheets are free for download!;) Electrical calculations (MS Excel Spreadsheets). Spreadsheet to calculate the size of neutral earthing transformer. I can’t download this software. But this is very important and very useful for all technical persons. Feb 02, 2014  SafeGrid earthing design software complies with IEEE Std. 80 and IEC 60479 safety standards. * Calculate Earth Resistivity. To download the file pls. Could you guide me r else. Industry.,www.egpet.net Website is Free Forum for Educational Purposes. SafeGrid Earthing Free Trial Fill out your details below to begin your trial. Once your information has been submitted you’ll be able to download the software.

* Calculate Size Battery Bank. * Select Type of connection of Batteries in Battery Bank * Calculate size of Inverter Calculate No of Lighting Fittings and Lumen Output. * Calculate Total Lumen Output for particular Area. * Calculate Total No of Lighting Lamps. * Calculate Total No of Lighting Fixtures.

You are correct jghrist, I have corrected my spreadsheet. If there are other return paths for earthfault current - such as overhead earth wires (OHEW)- then 3Io will be calculated using grid resistance (Rg) in parallel with the OHEW resistance. I used a 50/50 split as suggested in Auslee's posting of 16 Aug 10 18:30.

It will be built on top of a soil with resistivity 100 ohm.m (sry i used the word ground before). Using the IEEE excel sheet, how do you design the earth gird? Much appreciated is someone can correct the excel sheet. Many thanks and looking forward to your reply.

Tab 4_Ig=1193A shows a third configuration where 4.5m earth electrodes are installed at the intersection of each earth grid mesh. The earthgrid resistance is 4.84 Ohm resulting in a total earthfault current of 1193A flowing only in the earthgrid.

Configuration 1. Electrodes at diagonally opposite corners (distance between electrodes 5.83m) See tabs prefixed with 1_ on attached spreadsheet Eng-Tips_Thread238-279051-03.xlsx Configuration 2. Horizontal meshed conductors spaced 1.0m form a grid with earth electrodes at each corner. See tabs prefixed with 2_ on attached spreadsheet Eng-Tips_Thread238-279051-03.xlsx The tab 2_More Electrodes shows the effect of adding electrodes to each intersection of the horizontal conductors at the grid periphery. • RE: Earthing resistance and calculations (Electrical) 22 Aug 10 00:04.

Download by Import CAPE-OPEN version 1.1 thermodynamic and physical Property Packages into Matlab. A command driven package allows for selecting a CAPE-OPEN Property Package, and then perform thermodynamic and physical property calculations and phase equilibria. A command driven package allows for selecting a CAPE-OPEN Property Package, and then perform thermodynamic and physical property calculations as well as thermodynamic equilibrium calculations inside Matlab. The package defines the interfaces to communicate. Download by Make calculations in Contact, Group or Company fields based on data within other fields and over 80 supported functions.

* Calculate Energy from Solar Panel as per Daily Sun lights. * Calculate Size Battery Bank. * Select Type of connection of Batteries in Battery Bank * Calculate size of Inverter Calculate No of Lighting Fittings and Lumen Output. * Calculate Total Lumen Output for particular Area. * Calculate Total No of Lighting Lamps. * Calculate Total No of Lighting Fixtures.

I was just reading the other post where they say the same: well two questions: 1. It seems on that post they say IEEE 80 notes that only the HV side of the fault is to be considered. Tama serial number lookup.

• Load, fault & transient current distribution (in neutrals, shields, etc.). • Cathodic protection analysis of complex buried networks. • Inductive, conductive and capacitive interference in shared corridors.

• Calculate Resistance of neutral/Ground. • Calculate Neutral Current and Load.

Hi, I'm a bit new at substations grounding and I have given myself an exercise to do it for a 1 MVA 11/0.4kV kiosk substation but I need assistance please: 1. Is there any Free software that can help me with this?

Hence you are requested to explain and elaborate for better understanding of myself as follows: In practical all DG sets above 10-15 KVA are available in 3ph 4 wire system, hence single phase calculation is irrelevant in my case. Secondly you have projected cost of electricity @ Rs.135/ KWH considering Diesel cost @Rs54.00/ Ltr. Which is totally impractical. Awaiting your early reply in this regard shall help me a lot. With Warm Regards, Diwakar Shahi.

Thanks RE: Earthing resistance and calculations (Electrical) 19 Aug 10 03:12. If the 11kV is not earthed ( transformer secondary delta ) then in the event of an earthfalt on the 11kV system, only a very low capacitive current will flow in the earth. Most 11kV systems will be earthed ( transformer secondary star point earthed – or zig-zag transformer ).

(For interest rows 54 to 77 of tab 1_Input Data of attached spreadsheet Eng-Tips_Thread238-279051-03.xlsx shows calculated bolted earthfault on 415V terminals of 26425A I have used SKM Ground Mat software to calculate the touch and step voltages for two earthing configurations of the transformer kiosk assuming: 1. Kiosk occupies an area of 5m x 3m, 2. 11kV system prospective short-circuit current is 250 MVA, 3. System z1 = z2 = zo, 4. Standard IEEE 80, person weight 70kg barefeet, fault duration 0.2 sec, No Decrement factor used, soil resistivity 100 Ohm-m, No surface blue-metal, Earth Electrode L = 4.5m, DIA = 8 mm, equal current flows in earth and OHEW, Depth to top of Electrode /Grid = 0.5m. Calculated total current 3Io for an earth fault of the 11kV system at the transformer Kiosk = 443A.

* Calculate Short Circuit Current at Transformer. * Calculate Short Circuit Current at Main Panel. * Calculate Short Circuit Current at Sub Distribution Board. Circuit Breaker Tripping Settings. * Calculate Tripping Setting of Circuit Breaker. Motor Specifications * Calculate Various Specification of Motor. Calculate Home Electrical Load & Electrical Bill.

In Stations those have a Delta secondary or a floating star connected secondary leaving the station and then a fault occurs down the line, and if there is no ground return, Line breaks and hands to a wooden pole or falls on sandy ground. How current will return back to Source? Will the flow back simulate its self as a zero sequence flow with in Delta winding? My Earlier post, In case of a ground return available through a overhead ground wire, which is bonded to the mesh at the station and when the current will return back during a single line to ground fault in case of a solidly grounded star connected secondary winding leaving the station, Will it still be considered as Ig=(I (fault)- I (earth))?

Regarding the 3-4kV from 400V, ok, let's consider it's the HV side, if the utility has a fault level of 250MVA, then at 11kV primary, the fault level is 13kA. Vr = 13 kA * rho / (2 * pi * 3 meters) is still in the 2kV level, much higher than an acceptable step voltage, so again, aren't / haven't every 2 rods only been sufficient for a kiosk substation? RE: Earthing resistance and calculations (Electrical) 14 Aug 10 13:08. When a sub feeds a distribution network at 13 kV, 25 kV or 35 kV levels the distribution is often a four wire wye scheme with multiple protective earths. In the case of a hard line to earth or line to neutral fault, the fault current will divide between the earth path and the neutral copnductor.

• Select Rating of Each Solar Panel. • Calculate Energy from Solar Panel as per Daily Sun lights. • Calculate Size Battery Bank. • Select Type of connection of Batteries in Battery Bank • Calculate size of Inverter (15) Calculate No of Lighting Fittings and Lumen Output.

Anyways I would appreciate your word on this. Thanks RE: Earthing resistance and calculations (Electrical) 19 Aug 10 03:12. If the 11kV is not earthed ( transformer secondary delta ) then in the event of an earthfalt on the 11kV system, only a very low capacitive current will flow in the earth. Most 11kV systems will be earthed ( transformer secondary star point earthed – or zig-zag transformer ). If the O/H line includes an earth wire ( OHEW ) then in the event of an earth fault on the 11kV system, the total earthfault current ( 3Io ) will split between the earthgrid and the OHEW. An approximate method to determine this split is shown in AS 3835.2:2005 Section 5.9.2. More accurate methods are shown in IEEE 80 Annex C.

Horizontal meshed conductors spaced 1.0m form a grid with earth electrodes at each corner. See tabs prefixed with 2_ on attached spreadsheet Eng-Tips_Thread238-279051-03.xlsx The tab 2_More Electrodes shows the effect of adding electrodes to each intersection of the horizontal conductors at the grid periphery. • RE: Earthing resistance and calculations (Electrical) 22 Aug 10 00:04. Calculated total current 3Io for an earth fault of the 11kV system at the transformer Kiosk = 443A. Current flowing into the ground = 222AYou assumed that all of the current flowed through the earth when calculating the 443A.

If there is an OHEW the total earthfault current would be larger and some of this current would return to the source via the OHEW. Tab 4_Ig=1193A shows a third configuration where 4.5m earth electrodes are installed at the intersection of each earth grid mesh. The earthgrid resistance is 4.84 Ohm resulting in a total earthfault current of 1193A flowing only in the earthgrid. Touch and step voltages exceed the tolerable levels.

The main packages are:,,,,,,,,, and. AutoGround and MultiGround are specialized for low frequency grounding / earthing analysis and design, while MultiFields is dedicated to frequency domain and transient grounding, electromagnetic interference and electromagnetic field computations.

Then how to measure the insulation resistance in K.ohm. Is there any method or instrument available to measure 2.5 Kilo Ohm insulation resistance. Dear Sir, I have purchased all 47 calculation sheet on. And written a mail on same day and awaiting your reply till now i.e., 13/6/2016. While going through the attached sheet for D. Sizing found lots of discrepancies.

Electrical Earthing Calculation

I've attached Rev 3 of the excel sheet where the fault from the source is 6500A which is 13kA split in two, still high step and touch voltages. Let's keep it simple please:) I have a kiosk substation, 11/0.415kV, fault level from the supplier: 250MVA. The size of the substation is 5 x 3 meters (15 x 10 ft).