Factors affecting the insulation of UHV systems

Büyüközer, Mesut
Energization and reenergization overvoltages are the primary factors in establishing power system insulation level. As those overvoltages are generated by the closing operation of the circuit breaker which can be controlled, to produce the minimum surge, then insulation level can be reduced for economic system design. However other causes of overvoltages (steady state, fault, fault clearing) which are not controllable other than initial system design may produce sufficiently high voltages wiping out the savings made. In the thesis, the cause and maximum overvoltages produced during the normal operation, fault and fault clearing which would indicate the lower limits of surge reduction by the adjustment of circuit breaker are investigated and the measures to control these overvoltages are examined.


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Abedinzadeh, Taher; Ehsan, Mehdi; Afsharirad, Hadi; Nazaraliloo, Mohammad (2011-09-10)
For distribution grids connected wind power generation, voltage quality is an important issue for the system planning purpose. The operation of wind turbines in the distribution networks may affect the voltage quality offered to the consumers. One of the most important considerations is the effect on the voltage profile, i.e. the induced slow voltage variations, which are the subject of this paper.
Güven, Ali Nezih (1986-10-01)
It is important to determine the segment-by-segment distribution of the fault current in a multigrounded power network for better power system operation and grounding structure design. In this paper, a new method for the analysis of ground fault current distribution along underground cables (and/or overhead lines) is presented. The method is sufficiently accurate and comprehensive to simultaneously consider all the significant variables. The equivalent circuit developed utilizes both lumped and distributed ...
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Yılmaz, Deniz Derya; Tanyer, Ali Murat (null; 2015-05-28)
Many countries developed methods for the definition of houses with a very low energy use in the past years, among which Passive House represents a dwelling with extremely thermal insulated external envelope, good air tightness and highly efficient ventilation heat recovery to reduce energy consumption of buildings greatly depending on the location. This paper is carried out to see if it is possible to design tunnel-form structures as Passive House buildings. Also in this paper, construction of a Passive Hou...
Thermoelectric polymer films with a significantly high Seebeck coefficient and thermoelectric power factor obtained through surface energy filtering
Guan, Xin; Yıldırım, Erol; Fan, Zeng; Lu, Wanheng; Li, Bichen; Zeng, Kaiyang; Yang, Shuo-Wang; Ouyang, Jianyong (Royal Society of Chemistry (RSC), 2020-07-01)
Thermoelectric (TE) polymers have unique advantages in converting heat into electricity. But their Seebeck coefficient is lower than that of inorganic TE materials by about one order of magnitude. Here, surface energy filtering is proposed to significantly enhance the Seebeck coefficient of TE polymers. The as-prepared poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS, the most popular TE polymer) films from aqueous solution have a low Seebeck coefficient of 15-18 mu V K(-1)and a power fact...
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Jayaweera, Herath; Muhtaroğlu, Ali; Sustainable Environment and Energy Systems (2017-8)
The self-starting on-chip fully integrated ultra-low voltage DC-DC converters for energy harvesting applications presented in literature generally have low efficiency and output power capacity. Any improvement in DC-DC converter circuits in terms of energy efficiency, output power, self-starting modes, and voltage gain will contribute significantly to the widespread application of energy harvesters. Two novel fully integrated, self-starting, ultra-low voltage DC-DC converter topologies and model based optim...
Citation Formats
M. Büyüközer, “Factors affecting the insulation of UHV systems,” Middle East Technical University, 1978.