Specification for In-Service Test Methods for Temporary Grounding Jumper Assemblies Used on De-Energized Electric Power Lines and Equipment

2020 ◽  
Author(s):  
Irriga ◽  
2007 ◽  
Vol 12 (2) ◽  
pp. 263-272 ◽  
Author(s):  
Rodrigo Otávio Câmara Monteiro ◽  
Priscylla Ferraz ◽  
Rubens Duarte Coelho ◽  
Ronaldo Antônio do Santos

DISTÂNCIA DA REDE ELÉTRICA QUE VIABILIZA O USO DE MOTORES DIESEL EM ÁREAS IRRIGADAS DO BRASIL  Rodrigo Otávio Câmara Monteiro; Priscylla Ferraz; Rubens Duarte Coelho; Ronaldo Antônio do SantosEscola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP [email protected]  1 RESUMO             Na maioria das regiões do país, a energia elétrica aparece como a alternativa, economicamente mais viável, no acionamento de bombas em áreas irrigadas, o que justifica seu uso por aproximadamente 70% dos irrigantes. No entanto, em determinadas situações, não se dispõe, nas proximidades, de rede elétrica, o que passa a viabilizar o uso de motores diesel. Este trabalho, portanto, propôs a análise dos custos horários de bombeamento com a operação de motores diesel e elétricos nas 5 regiões do Brasil. Considerou-se as composições tarifárias verde, azul e convencional, período de irrigação de 2, 4, 6 e 8 meses por ano e operação no horário de ponta e fora de ponta. Para essa avaliação, foi considerado um motor diesel e elétrico, de potência comercial de 50 cv. O ponto de equilíbrio entre motor elétrico e diesel foi determinado pela distância da rede de energia elétrica até o local de consumo. A viabilidade de utilização dos motores diesel em relação ao acionamento de motores elétricos foi encontrada a partir de distâncias da rede de transmissão elétrica de1,32 a8,71 km, sendo a primeira a condição mais atrativa, encontrada na região Sudeste, com 2 meses/ano de irrigação, na tarifa convencional. UNITERMOS: Energia elétrica, irrigação, custo de bombeamento  MONTEIRO, R. O. C.; FERRAZ, P.; COELHO, R. D.; SANTOS, R.A. do. VIABILITY OF DIESEL MOTOR USE IN IRRIGATED AREAS OF BRAZIL DUE TO DISTANCE FROM ELECTRIC POWER LINES  2 ABSTRACT In most agricultural areas ofBrazil, electric power seems to be the most feasible economic alternate methods for the functioning of pumps in irrigated areas, therefore 70%  of irrigation systems use it. However, the viability of electric power lines is restricted to only one part of rural areas, making it necessary the implementation of diesel engines as a source of electrical power for water management. The aim of this study was to investigate the viability of the use of electric energy and diesel motors.  For this study, an electric motor and a diesel one, both of 50HP potency, were evaluated, taking into consideration the following variables: tax composition, areas of the country and number of operation hours per year. The viability of the diesel engine use in relation to implantation of electric motors was determined from  distances that ranged from1.32 kmup to8.71 kmbetween the consumption place and the electric power lines. The most favorable condition is the one found in  the southeast of the country: 2 irrigation months/year.KEYWORDS: Electric energy, irrigation, pump costs 


2020 ◽  
Vol 17 ◽  
pp. 105-108
Author(s):  
Marko Kaasik ◽  
Sander Mirme

Abstract. The electric power that can be transmitted via high-voltage transmission lines is limited by the Joule heating of the conductors. In the case of coastal wind farms, the wind that produces power simultaneously contributes to the cooling of high-voltage overhead conductors. Ideally this would allow for increased power transmission or decreased dimensions and cost of the conductor wires. In this study we investigate how well the wind speed in coastal wind farms is correlated with wind along a 75 km long 330 kW power line towards inland. It is found that correlations between wind speed in coastal wind farms at turbine height and conductor-level (10 m) are remarkably lower (R=0.39–0.64) than between wind farms at distances up to 100 km from each other (R=0.76–0.97). Dense mixed forest surrounding the power line reduces both local wind speed and the correlations with coastal higher-level wind, thus making the cooling effect less reliable.


2020 ◽  
Vol 32 (4) ◽  
pp. 455-487
Author(s):  
R. Borsche ◽  
D. Kocoglu ◽  
S. Trenn

AbstractA distributional solution framework is developed for systems consisting of linear hyperbolic partial differential equations and switched differential-algebraic equations (DAEs) which are coupled via boundary conditions. The unique solvability is then characterize in terms of a switched delay DAE. The theory is illustrated with an example of electric power lines modelled by the telegraph equations which are coupled via a switching transformer where simulations confirm the predicted impulsive solutions.


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