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This paper presents the revised MEA Smart Grid roadmap and the pilot project called Smart District Office Building. The MEA Smart Grid roadmap which is aligned with National Smart Grid Policy of Thailand, mainly focuses on 3 important enhancement aspects: Smart System, Smart Service and Green Society for smart and low carbon city. In MEA viewpoint, Smart Grid is viewed as electric power distribution...
This paper is aimed to study the impact of Solar PV Rooftop posing on MEA distribution system. The simulation was made using the PSS/ADEPT program with the system parameters obtained from Geographical Information System (GIS). In the study, the maximum size of Solar PV plant that MEA feeders could accommodate in different locations was quantified; the reduction in distribution losses was evaluated...
This paper proposes an application of Geographic Information System (GIS) to distribution substation planning for distribution systems of Metropolitan Electricity Authority (MEA). The main objective is to serve future load growth and to increase the reliability of the distribution systems. GIS is extensively used in the planning process as it contains comprehensive topological information of electrical...
This paper presents a touch voltage reduction technique for a uniform and two-layer soil by applying grid compression ratio. The design of ground grid is discussed pertinent to its maximum touch and step voltage produced for a given ground potential rise (GPR). The parameters are analyzed to ensure that they conform to the IEEE 80-2000. It is found that, for a given GPR, the maximum touch and step...
The study is separated into 2 parts. Part 1 involves characteristic of uniform soil. If the upper layer of two-layer soil is greater than 16 m, it can be treated as homogeneous one. Part 2 deals with the significant factor and give some suggestions that grounding system designer should know before design. The main objective of this paper is to be used as preliminary guide for first hand designer in...
This paper analyzes the existing performance of insulator strings described in term of the total flash over rate (TFOR) for 69 kV and 115 kV subtransmission lines in a service area of Metropolitan Electricity Authority (MEA), Thailand. Presently, the design and installation of insulator strings for 69 kV and 115 kV subtransmission lines in MEA are based on American National Standards Institute (ANSI)...
This paper presents the effect of lightning waveform to the voltage at the pole top and back flashover rate (BFOR). The result found that short front time of lightning current waveform or high slope will cause high voltage and back flashover rate at the top pole. However the tail time of lightning current waveform will not effect to the top pole voltage and backflash over rate because the impulse...
This paper presents touch voltage reduction technique for uniform and two-layer soil by applying grid compression ratio. The design of ground grid is discussed pertinent to its maximum touch and step voltage produced for a given GPR. The parameters are analyzed to ensure that they conform to the IEEE 80-2000. It is found that, for a given GPR, the maximum touch and step voltages of the rectangle grid,...
The back flashover generated from a lightning stroke hit at different locations: either at the end of pole top or the middle of the span of the overhead ground wire (OHGW), is one of the major causes of sustained interruption in Metropolitan Electricity Authority (MEA)'s distribution system, Thailand. One effective way to reduce the effects of such lightning overvoltage from back flashover is an addition...
This paper presents construction planning procedures for a new permanent substation to replace an small (temporary) substation that is served to supply the load of the old existing substation while it has not been removed. In the meantime when the ground grids of the two substations are electrically disconnected, the auxiliary grounding system of substation can create steep ground potential rise (GPR)...
The Back flashover generated from a lightning stroke hit on an overhead ground wire (OHGW) or a pole top is one of the major causes of sustained interruption in Metropolitan Electricity Authority (MEA)'s distribution system. One effective way to reduce the effects of lightning overvoltage from back flashover is an attachment of external ground wire connected between the overhead ground wires and a...
The study provides comparison of grounding performance between square and rectangle ground grid, when given the same size of area of coverage. The result shows that the rectangle ground grid possesses better grounding performance than the square one. The study also finds the optimum compression ratio (OCR) of both grounding configuration. The OCR of square and rectangle ground grids are found to be...
This paper presents construction planning procedures for a new permanent substation to replace an small (temporary) substation that is served to supply the load of the old existing substation while it has not been removed. In the meantime when the ground grids of the two substations are electrically disconnected, the auxiliary grounding system of substation can create steep ground potential rise between...
This paper proposes characteristic of uniform (homogeneous) soil and grounding performance assessment which consist of ground potential rise (GPR), touch voltage and step voltage of ground grid buried in 0.5 m depth of uniform and two-layer soil. The study is separated in 2 parts. Part 1 involves characteristic of uniform soil. If the upper layer of two-layer soil is greater than 16 m, the characteristic...
This paper presents an external ground design in distribution system for improved lightning performance. Lightning protection is a set of features typically designed into grounding systems at locations subject to lightning damage. Basically, back flashover occurs when the amplitude of the lightning overvoltage experienced by insulator strings in response to direct strikes to a tower or to the shield...
The heat cycles test set is designed and built in accordance with what is discussed in the article for high voltage cables testing [1, 2]. The test set feeds current periodically into the cable under testing. In on-cycle, the test set heats up the cable for at least 8 hours while in the off-cycle, it allows the cable to cool down for at least 16 hours until its conductor temperature is within 10 °C...
This paper analyzes the effects of the voltage across insulator of 69 kV and 24 kV lines installed on the same pole. The case studies illustrated the lightning strike to direct top pole and mid span of ground wire using the Alternative Transient Program-Electromagnetic Transient Program (ATP-EMTP). The results found that when lightning strike the voltage across the 69 kV line insulator at mid span...
This paper analyzes the performance of grounding system that is made of copper conductors and significantly influenced by soil resistivity. The grounding performance is evaluated in terms of ground potential rise, touch voltage and step voltage caused by a short circuit that generates a flow of large currents in the aboveground structures and grounding system and dissipates in the soil. These currents...
Back flashover generated from a lightning stroke hit on an overhead ground wire or a pole is one of the major causes of sustained interruption in Metropolitan Electricity Authority (MEA)'s distribution system. One effective way to reduce the effects of lightning overvoltage from back flashover is an attachment of external ground wire connected between the overhead ground wires and a ground rod. This...
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