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As per Eddy's calculations (and sorry for the caps) TWO ELECTRODES ONLY ARE NOT ENOUGH FOR A SIMPLE KIOSK SUBSTATION FED FROM A NORMAL SOURCE (250MVA) AT 11kV I am not questioning Eddy's calculations, it's just that no matter how you twist the calculations, you will always get that result. I have seen really countless kiosk substations approved with only 2 electrodes. Can it be that the concrete plinth >>is. 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.

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Grounding Design Calculations – Part Seven and Grounding Design Calculations – Part Eight: Using Online Earthing Calculators Grounding Design Calculations – Part Nine: Software Programs Method Second: High And Medium Voltage Electricity AC. Home / Download Center / Electrical Software / Earthing Mat. Software: Earthing Mat Design. Explain the brief note for earth mat calculation.

Cheers:) • RE: Earthing resistance and calculations (Electrical) 15 Aug 10 13:40. I suspect that the high step voltages that you are seeing are an issue for the line feeding your kiosk and the transformer or sub feeding that line. Ground fault current on the primary side will be supplied by the source line and sub, not by your transformer. If your system is capable of regenerating there may be some ground fault contribution by your transformer but that calculation will be based on the capability of the machines back feeding. Bill -------------------- 'Why not the best?' Jimmy Carter RE: Earthing resistance and calculations (Electrical). Thanks waross, i confirm that the 13kA at the primary side is calculated as follows: 250MVA / 11 / sqrt(3) = 13kA and is irrespective of the transformer (630kVA, 1MVA, etc.) and that any possible regenration (as you pointed out) is not possible in this case.

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Marmite is correct as to why IEEE80 doesn't consider LV faults for step and touch, though you'll still need to ensure that the connections to the ground grid can handle the prospective LV fault level. That said, the main issue that appears in terms of the difference is the method of calculation of acceptable step and touch potentials. Ground grid design doesn't appear to be different between the two standards.

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If the overhead line includes an earthwire ( OHEW ) connected to earth electrode(s) at each pole, then detailed information on the overhead line, earth wire, span, earth electrode details, earth resistivity would be required to determine the current split. Is star point of the source transformer solidly earthed? Current split between ground and earthwire is required to calculate touch and step voltages. I have used SKM's Ground Mat software for the above calculations.

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. Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India.

Suppose the primary is 115 kV Delta and Secondary is 44 kV with solidly grounded star connection. Three O/H line leave the station with a ground underneath the three wires and no neutral. Dont you think in that case if a fault occurs 1 KM down the line on secondary side, fault current would return through the ground connection and then the grid, the neutral connection and then the transformer back to the line faulted feeding the fault.

MultiLines is ideal for computing line parameters (line constants) of most conductors, including complex buried and above ground pipe-type cables. MultiFields+, MultiGround+ and MultiGroundZ+ include the MultilLines package, which consists of FCDIST, TRALIN and SPLITS engineering modules. These last two modules are required to determine electric interference levels along utility rights-of-way. The three specialized packages are:, and. The software tools and utilities are:,,,,,,,,,,,,, and. The AutoGround and MultiGround packages include the dedicated grounding / earthing software package AutoGrid Pro as well as the fully automated specialized grounding / earthing package AutoGroundDesign that can design a grounding system without user's intervention.

Usually, a fault on the HV side of the substation is a worse condition, however. If there is no metallic return, then there may be step- and touch-voltage problems at the substation, but there will be a worse problem at the location of the fault unless there is a large ground grid system there. You may also have problems detecting and tripping for a fault with no metallic return path. RE: Earthing resistance and calculations. Three O/H line leave the station with a ground underneath the three wires and no neutral.

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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.

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And what about the 'value' of taking a decent soil resistivity using a vertical probe vs the 4 point method and coming up with just 1 value? Especially if the software will just ask for the soil resistivity as 1 value input and calculate the voltage gradients from the short circuit current and the grid layout. RE: Earthing resistance and calculations (Electrical) 14 Aug 10 14:02. Given your location, you should also consider the relevance of AS2067 as opposed to the previously used IEEE 80. Most utilities seem to be playing catch up with the standard, though as I understand it compliance with AS2067 is referenced from AS3000 and thus all consumer sites need to comply. IEEE 80 will, however, give a reasonable indication of the process.

* Enter Your Sub Panel Details like Load,Line Length. Design of Earthing Mat for Sub-Station: * Program is design as per ANSI/IEEE 80-1986 Code. * Calculate Step Potential of Switch yard. * Calculate Touch Potential of Switch yard. * Calculate Total Length of Earthing Mat Conductor. * Calculate Size of Earthing Mat Conductor.

Intention The LPI Earthing Calculator is designed to give an indicative result to assist with the preliminary planning of an earthing installation. It calculates both the expected system resistance, and the quantity of Grip or Reslo earth enhancing compounds. All calculation use formulas taken directly from recognised IEEE and AS1768 standards. Limitations The LPI Earthing Calculator is provided as is and LPI does not warrant or accept responsibility for the results provided. Whilst the formulas used cover a range of common simple arrangements, the design of an earth system (including the input parameters) requires engineering judgement and all results should be verified by an appropriately qualified engineer taking into account such things as step and touch potential, site layout, materials, fault current, and so on.

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. Current flowing into the ground = 222A The results of both the following configurations are shown on the attached spreadsheet.

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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? A friend of mine at work uses a decent software in his department (ETA Power Station). I was surprised when he showed me the screen for the soil resistivity: you specify only the cover, upper layer (and its depth) and lower layer. Shouldn't there be a procedure to go on site and use a 'Shepperd' stick (vertical rod with battery and two electrodes) and take measurements across several points on the site?

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I second jghrist's question regarding 50% split(?) 2. As per Eddy's calculations (and sorry for the caps) TWO ELECTRODES ONLY ARE NOT ENOUGH FOR A SIMPLE KIOSK SUBSTATION FED FROM A NORMAL SOURCE (250MVA) AT 11kV I am not questioning Eddy's calculations, it's just that no matter how you twist the calculations, you will always get that result. I have seen really countless kiosk substations approved with only 2 electrodes. Can it be that the concrete plinth >>is. 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.