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This paper compares the capacitor voltage by numerical simulation using the Euler integration technique, the trapezoidal rule (the same format used by EMTP) and also the simulation using the EMTP-ATPDraw program. A 115/22 kV transformer supplies a resistive load which is connected in parallel with the switchable capacitor bank has been modeled. The capacitor voltage from EMTP approach is exactly match...
This paper compares the calculations of insulation levels and electrical clearances for 230 kV air insulated substation based on IEEE and IEC standards. The IEEE Std. 1427 can be applied for phase to ground and phase to phase insulations and electrical clearances calculations. Besides calculations, the simulation tool, EMTP as presents in IEEE Std. 1313.2 can be helpful for estimation the crest voltages...
This paper presents the comparison of back-flashover rate (BFR) by applying the CIGRE method and the IEEE-Flash software. The BFR on 230kV single and double circuits transmission lines have been compared. Firstly, the BFR from the two iterative methods, CIGRE and the simplified methods, have been compared then the BFR using CIGRE method has been chosen in order to compare the results with the IEEE-Flash...
This paper analyzes the insulation levels and clearances of 230 kV air insulated substation based on switching surge. The basic switching impulse insulation levels (BSL) and air clearances, both for phase to ground and phase to phase have been calculated. In order to get the insulation levels, BSL and clearances, the iterative method is required. The insulation levels and clearances have been implemented...
This paper simulates the operation of automatic circuit recloser under the system ground fault condition using MODELS language in transient digital simulation EMTP-ATPDraw. Any other recloser operation schemes such as two fast-one delay or one fast-one delay can be modeled. In this paper the recloser model has been tested with two fast and one time delay operation schemes for both temporary and permanent...
This paper analyzes the insulation level and air clearances of 230 kV air insulated substation. In order to get the BIL, the crest voltage at any equipment are required. By applying simplified calculation method taken from IEEE Std. 1313.2-1999 and IEEE Std. 1427-2006 compared with digital simulation. The simulations have been implemented using simplified models via EMTP-ATP. The BIL required and...
This paper analyzes the lightning performance of 22 kV single and double circuits overhead distribution lines by means of installation the additional underbuilt shield wire. The simulations have been implemented using ATPDraw and calculations by applying equations taken from IEEE std. 1410-2010. The total number of flashovers, direct stroke and induced voltage flashovers, have been evaluated. The...
This paper presents the analysis of lightning overvoltage for the new coming 115 kV CMU (ChiangMai University) GIS (Gas Insulated Switchgear) substation applying simplified models. The GIS being considered here is connected to an overhead line through XLPE underground cables. The sensitivity analysis of lightning overvoltage have been evaluated using ATP-EMTP. Factors including, pole footing resistance,...
This paper calculates the lightning flashover rates of 22 kV overhead distribution line. In order to calculate the backflashover rate (BFOR), the performance of line which related to the insulator backflashover has been modeled and analyzed using Electromagnetic Transient Program (EMTP). The shielding failure flashover rate (SFFOR) and induced voltage flashover rate (IVFOR) have been calculated follow...
This paper analyzes the lightning performance of 22 kV, ChiangMai substation 4 to Doi-Suthep, overhead distribution line with covered conductors. The performance of line which related to the insulator flashover has been modeled and analyzed using EMTP. The backflashover rate (BFOR), shielding failure flashover rate (SFFOR) and induced voltage flashover rate (IVFOR) of line have been determined. The...
This paper presents an approach to analyze the overhead ground wire (OHGW) sizes in distribution system focus on the i2t of line to ground fault current. For line to ground fault, the fault current and duration time when fault take place as well as the relay operating time have been concerned. The line type I, OHGW not connected to the neutral of substation power transformer, give the short circuit...
This paper compares the ground potential rise (GPR) from lightning overvoltage with two different grounding methods, no bonding and bonding of grounding systems, between the communication tower and main ground bar (MGB) of the TOT communication station. Direct lightning stroke to the communication tower gives the higher overvoltage than the lightning stroke on distribution overhead line and also higher...
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