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Progress of, and prospects for, commercial applications of UHV 1100kV Transmission System in TEPCO

2 nd International Symposium on International Standards for Ultra High Voltage, New Delhi, January 29-30, 2009. Progress of, and prospects for, commercial applications of UHV 1100kV Transmission System in TEPCO. Hiroshi OKAMOTO TEPCO. UHV Transmission Lines in TEPCO.

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Progress of, and prospects for, commercial applications of UHV 1100kV Transmission System in TEPCO

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  1. 2nd International Symposium on International Standards for Ultra High Voltage, New Delhi, January 29-30, 2009 Progress of, and prospects for, commercial applications of UHV 1100kV Transmission System in TEPCO Hiroshi OKAMOTO TEPCO

  2. UHV Transmission Lines in TEPCO 〈North-South Route〉 [1993] Minami-Nigata Line: 49km×2cct (Total Length: 111km) Nishi-Gunma Line: 138km×2cct 〈East-West Route〉 [1999] Minami-Iwaki Line: 194km×2cct Higashi-Gunma Line: 44km×2cct

  3. High Speed Grounding Switch(HSGS) MOSA, CB with resistor UHV System Design Solution for network problem peculiar to UHV system • Secondary arc extinction for fast reclosing, etc. Insulation design • Rationalization of insulation coordination Transmission line design • Size reduction of UHV transmission tower • Electric and Magnetic field, corona noise, wind noise Substation design • Size reduction of substation equipment • Development of highly reliable equipment

  4. Issues to be addressedin voltage upgrade • To reduce annual capital expenditure below a certain rational level, • To ensure flexibility under uncertainty in the development of power plants, • To reduce a risk of degradation of reliability during the construction period for upgrading, and • To shorten the planned outage of transmission lines during the construction.

  5. Schematic diagram of UHV designed transmission lines

  6. Option 1 Only single circuit will be operated at 1100kV and the other circuit at 550kV in the very first stage of the upgrading.

  7. Studied Issues • switching overvoltage induced in 1100kV and 550kV circuits, • lightning overvoltage in the substations, • short circuit phenomena between 1100kV and 550kV circuits, • necessity of HSGS in the 550kV circuit to extinguish secondary arc current after the fault in the circuit, • operation and maintenance considering outage of equipment, • protection, • TRV and • voltage deviation due to energization and de-energization

  8. Option 2 Simplified bus configuration may be applied as a cost-effective solution for line U1-U5 only if the subsequent upgrade is not expected over the long term.

  9. Switching Overvoltage Analysis U1 U1 U5 U5 double-bus-bar four-bus-tie configuration simplified bus configuration

  10. Option 3 Double T connection at U2 S/S, instead of double p connection, can reduce the installation cost.

  11. Concluding Remarks • TEPCO is now studying the issues for upgrading the operating voltage of the constructed UHV transmission lines from 550kV to 1100kV. • We will finalize technical specification of substation equipment shortly so as to be able to respond quickly and flexibly to future generation developments. • In this context, standardization of the UHV technology is urgently needed.

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