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11 октября 2016
«ЭЛЕКТРОЭНЕРГИЯ. Передача и распределение» № 5(38), сентябрь-октябрь 2016
НОРМАТИВЫ И СТАНДАРТЫ
НОРМАТИВЫ И СТАНДАРТЫ
УПРАВЛЕНИЕ АКТИВАМИ
УПРАВЛЕНИЕ АКТИВАМИ
ВОЗДУШНЫЕ ЛИНИИ
РЕЛЕЙНАЯ ЗАЩИТА
РЕЛЕЙНАЯ ЗАЩИТА
ДИАГНОСТИКА
КАДРЫ
МИРОВОЙ ОПЫТ
“Electric power. Transmission and distribution”
No. 5(38), September-October, 2016
TOPIC OF INTEREST
Interviewof the Day
Quality operation in summer — reliable electric power supply in winter
Guest of the Journal
The Far East power system development
RUSSIAN POWER GRIDS
Events
Inception
PJSC “ROSSETI” has provided reliable electric power supply for facilities of the Eastern Economic Forum 2016
FIFA World Cup 2018
Reliable electrical networks of St. Petersburg as a basis for successful execution of World Cup 2018
Light for the championship
Regulations and Standards
Power quality monitoring in electrical networks. For whom, why and how?
Abstract.
The paper presents the results of regulatory requirements analysis for power quality monitoring. Some problems associated with automated monitoring systems implementation, conducting measurements and its results are given. The experience of power quality monitoring in European countries is presented.
Keywords:
power quality, power quality index, continuous monitoring, distribution network, backbone network, measurement points
Subcommittee-2 “Backbone and distribution networks” summarizes work undertaken for two years since its establishment
Electrical Power Supply
Energy-efficient technology for 0.95 kV electric power transmission
Updating approaches for determination of business assets volume and assessment of current electrical networks reliability
Abstract.
The paper justifies the suggestion of improving IDGC business assets volume calculation. Transition from “conventional units” to the index expressed in named units (kVA, MVA) through the installed capacity of electrical installations in distribution networks is presented. A methodology for calculating business assets volume in named units is given.
Keywords:
power grids reliability, electricity market, business assets, balance sheet attribution, working capacity, installed capacity, factor of effective use of installed capacity
Asset Management
Unified technical policy of PJSC “ROSSETI” in the field of automation of technological management
Theory of failures probability
Maintenance and Refurbishment
Maintenance and refurbishment as a guarantee of power plants and electrical networks stable operation
Overhead Transmission Lines
New requirements for transmission towers aesthetics
Multicircuit overhead transmission lines: critical analysis, construction and deployment problems, prospects of implementation and development
Abstract.
The paper presents some important issues related to implementation of specific innovative designs of multicircuit overhead transmission lines. The necessity of multicircuit overhead transmission lines implementation is confirmed by electrical grids and power supply systems operation under modern development conditions. Especially, such implementation is important to ensure electrical power supply of megacities.
Keywords:
multicircuit overhead transmission lines, electrical power supply for megacities, composite transmission lines, active power losses
How to return light for people?
Cable Lines
Neutral grounding in 6–35 kV electrical networks
Abstract.
In medium voltage networks there are many ways of grounding of a neutral. Among them are well-known insulated neutral, the neutral grounded through a reactor or resistor. The choice of optimal method of grounding depends upon many factors, including the characteristics used in network equipment. The article discusses the reasons for networks 6–35 kV containing cable lines with XLPE insulation to have resistive neutral grounding.
Keywords:
cable line, single-core power cable, cross-linked polyethylene insulation, neutral grounding, single-phase fault
About power losses in 20 kV cable screens
Abstract.
In recent years single-phase cables with XLPE insulation have been widely used in distribution networks. They consist of isolated conductors and screens, as well as external insulation. A large number of publications have been dedicated to justifying and choosing the methods of cable screens grounding. Those publications contain a lot of cumbersome arithmetic, complicated formulas and calculation programs for computers. When designing cable lines, the issues of cable screens grounding are central from the standpoint of power losses minimization (power losses impact on lines capacity significantly). Probably, this problem is presented as too complicated for 20 kV electrical networks. Relevant arguments are given in the paper.
Keywords:
single-phase cables with XLPE insulation, design of cable lines, power losses, 20 kV electrical networks, cable screens grounding
Methods of cable screens grounding
Abstract.
The paper considers and compares the methods of screens connecting and grounding for phase-screened cables with XLPE insulation in 20 kV distribution networks. In addition to screens grounding methods are widely used in practice, the methods using discontinuities and joints of screens in the middle of the line, grounding through a resistor, grounding at one end of the line, and joint without grounding at the other end are considered. The impact of cable screens grounding methods on electrical safety, voltage on the screen in the steady state, advection of grounding device potential of main substation to distribution substations, electric power losses in the screens in the steady state, cable screens thermal resistance, voltage drop in cable lines and cable lines transmission capacity are analyzed.
Keywords:
power cable, XLPE insulation, cable screen grounding, thermal resistance of cable screens, advection of potential, fault voltage, cable screens connection diagram
Equipment
Packaged transformer substations. Special features of pole-mounted substations for sites illumination
Implementation of power transformers with reduced power consumption at IDGC of Centre, PJSC
Relay Protection
Automatic reclosing control equipment for aerial cable lines of megacities
Possibilities of relay protection operations centralization for distribution network protection
Diagnostics
New technologies and equipment (methods and devices) for fault localization
Abstract.
The paper considers current problems of implementing modern methods and devices for fault localization. Application prospects and effectiveness of fault localization through wave methods are analyzed. The results of devices development are presented. The structure, parameters, hardware and software, test and implementation data of the devices are given.
Keywords:
fault localization, wave methods, synchronized measurements, multifunction device, power quality indexes
Nuances of diagnostics. Additional parameters of high-voltage circuit breakers control
Analysis and experience of power transformers monitoring systems implementation at PJSC “Lenenergo” from the point of view of online chromatographs manufacturer
Breakthrough In Power Engineering
Development of innovative projects
A new method for paper insulation state assessment in power transformers
I-TOR-110 as an effective tool for increasing the profitability of utilities
Exhibitions and Conferences
Autonomous and uninterrupted electrical power supply at “Army-2016” forum
HUMAN RESOURCE
Production Staff
Field service team — eyes and hands of electrical networks
Practical experience and technology of trainings on equipment repair and adjustment through Twr12 program simulator complex
GLOBAL EXPERIENCE
Power Systems Management
Important events in world power systems operation and development in September 2016
Renewable Energy
Climate negotiations participants still have much to learn about energy conversion