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1

A new approach to cross-bonding in medium voltage cable lines

Klucznik Jacek

Przegląd Elektrotechniczny

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2023

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R. 99, nr 2

67--72

EN

The medium voltage underground cable sheaths are usually bonded and earthed in every substation on the cable route. This results in additional power losses in the sheaths. The paper presents an idea of reducing power losses caused by sheaths cross-bonding. The idea of sheaths cross-connecting only in selected MV/LV substations is given instead of a typical solution, where sheaths cross-bonding requires installing additional joints on the cable route. It leads to a significant power losses reduction while investment cost remains low. Two cases are analysed in the paper: a theoretical simple radial network and a part of a real open-loop network. A significant power losses reduction was obtained in both cases.

PL

Żyły powrotne kabli średniego napięcia są zazwyczaj łączone ze sobą i uziemiane w każdej stacji na trasie linii kablowej. Skutkuje to dodatkowymi stratami mocy w żyłach powrotnych. Referat przedstawia ideę ograniczenia tych strat poprzez zastosowanie przeplotu żył powrotnych. Proponowana jest jednak metoda wykonania połączeń cross-bondingowych jedynie w wybranych stacjach SN/nn, a nie za pomocą instalowania dodatkowych muf na trasie kabla. Powoduje to zmniejszenie strat mocy przy niewielkim nakładzie środków finansowych. W referacie rozważane są dwie sieci – sieć teoretyczna oraz fragment sieci rzeczywistej. W obu analizowanych przypadkach osiągnięto istotne zmniejszenie strat mocy.

2

Efficient cloud-based digital-physical testing method for feeder automation system in electrical power distribution network

Chen Guoyan, Mo Wenxiong, Wang Hongbin, Tang Jinrui, Bian Xinhao

Archives of Electrical Engineering

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2020

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Vol. 69, nr 3

545--559

EN

A feeder automation (FA) system is usually used by electricity utilities to improve power supply reliability. The FA system was realized by the coordinated control of feeder terminal units (FTUs) in the electrical power distribution network. Existing FA testing technologies can only test basic functions of FTUs, while the coordinated control function among several FTUs during the self-healing process cannot be tested and evaluated. In this paper, a novel cloud-based digital-physical testing method is proposed and discussed for coordinated control capacity test of the FTUs in the distribution network. The coordinated control principle of the FTUs in the local-reclosing FA system is introduced firstly and then, the scheme of the proposed cloud-based digital-physical FA testing method is proposed and discussed. The theoretical action sequences of the FTUs consisting of the FTU under test and the FTUs installed in the same feeder are analyzed and illustrated. The theoretical action sequences are compared with the test results obtained by the realized cloud-based simulation platform and the digital-physical hybrid communication interaction. The coordinated control capacity of the FTUs can be evaluated by the comparative result. Experimental verification shows that the FA function can be tested efficiently and accurately based on our proposed method in the power distribution system inspection.

3

Housing development building management system (HDBMS) for optimized electricity bills

Li W., Logenthiran T., Phan V.-T., Woo W. L.

Transactions on Environment and Electrical Engineering

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2017

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Vol. 2, No. 2

64--71

EN

Smart Buildings is a modern building that allows residents to have sustainable comfort with high efficiency of electricity usage. These objectives could be achieved by applying appropriate, capable optimization algorithms and techniques. This paper presents a Housing Development Building Management System (HDBMS) strategy inspired by Building Energy Management System (BEMS) concept that will integrate with smart buildings using Supply Side Management (SSM) and Demand Side Management (DSM) System. HDBMS is a Multi-Agent System (MAS) based decentralized decision making system proposed by various authors. MAS based HDBMS was created using JAVA on a IEEE FIPA compliant multi-agent platform named JADE. It allows agents to communicate, interact and negotiate with energy supply and demand of the smart buildings to provide the optimal energy usage and minimal electricity costs. This results in reducing the load of the power distribution system in smart buildings which simulation studies has shown the potential of proposed HDBMS strategy to provide the optimal solution for smart building energy management.

4

Uproszone modelowanie sieci dystrybucyjnej na potrzeby analiz przyłączeniowych

Bućko P., Buriak J., Dobrzyński K., Jaskólski M., Skoczko P., Zieliński P.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2015

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Nr 42

147--150

PL

W artykule przedstawiono rozważania na temat sposobu modelowania sieci średniego (SN) i niskiego (nn) napięcia na potrzeby wykonywania analiz przyłączeniowych przez operatorów sieci dystrybucyjnej. Przeprowadzono dyskusję na temat możliwych do wykonania uproszczeń w modelowaniu sieci, które są do zaakceptowania z punktu widzenia uzyskiwanego wyniku końcowego. Głównym elementem wymuszającym uproszenia w modelowaniu jest środowisko MS Excel, które wykorzystano jako platformę obliczeniową oraz czas jaki należy poświęcić na Zamodelowanie sieci.

EN

The article presents considerations on the approach for modeling the medium (MV) and low (LV) voltage power system for the purposes of carrying out connection analyses by distribution network operators. Network modeling simplifications that are possible to perform and acceptable from the point of view of the final result obtained were discussed.

5

Wykorzystanie metody TOPSIS w procesie klasyfikacji dobowych obciążeń stacji transformatorowych

Zalewski W.

Ekonomia i Zarządzanie

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2013

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Vol. 5, no. 4

101--110

PL

W artykule przedstawiono możliwość zastosowania metody TOPSIS do grupowania profili obciążeń w elektroenergetycznych sieciach rozdzielczych na podstawie parametrów opisujących krzywe obciążenia różnych odbiorców. Rozważania teoretyczne poparto analizą danych pomiarowych uzyskanych w wybranych stacjach transformatorowych SN/nn na terenie dawnego Zakładu Energetycznego Białystok Miasto.

EN

This paper presents an application of the TOPSIS method for classification of load profiles in electric power distribution systems. Verification of the proposed method of load clustering was based on the data from selected distribution substations in Bialystok Power Distribution Utility Co. Simulation studies have been performed to demonstrate the efficiency of the proposed method and an effect of different parameters on its accuracy on the basis of actual data obtained at distribution system substations.

6

Development and Research Power-Supply System Model with TCT UCS

Sosnina E., Bedretdinov R.

Challenges of Modern Technology

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2013

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Vol. 4, no. 3

41--47

EN

Problem of upgrading the power quality for household consumers electricity has been considered. It was recommended to use the noncontact thyristor controlled transformer with unidirectional current switches. We conducted a set of calculating the power supply system parameters. This allowed to perform of power supply system elements model tests and to create electric power distribution system simulation model in the program Matlab (Simulink). We conducted research of received model and completed the analysis of modeling results.

7

Wpływ czynników atmosferycznych na zmienność zużycia energii elektrycznej

Zalewski W.

Ekonomia i Zarządzanie

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2011

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Vol. 3, no. 4

195-202

EN

This paper presents an application of statistical analysis to the estimation of the influence of weather on the variability of the electricity consumption in different parts of power distribution system. Simulation studies have been performed to demonstrate the efficiency of the proposed scheme and an effect of different parameters on its accuracy on the basis of actual data obtained at distribution system substations. To verify the proposed method of energy consumption estimation the measurements of daily energy consumption and weather factors at selected distribution substations in Bialystok Power Distribution Utility Co. were made in 365 days.

8

Statystyczna analiza zmienności obciążeń w sieciach rozdzielczych

Zalewski W.

Ekonomia i Zarządzanie

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2010

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Vol. 2, no. 4

206-213

EN

This paper presents application statistical analysis to the electrical load modeling clustering of load profiles in different part of system was used to classify the substations. Simulation studies have been performed to demonstrate the efficiency of the proposed scheme and an effect of different parameters on its accuracy on the basis of actual data obtained at distribution system substations. To verify the proposed method of load estimation the measurements of daily energy consumption and daily load at selected distribution substations in Bialystok Power Distribution Utility Co. were made in 365 days. Simulation studies have been performed to demonstrate the efficiency of the proposed scheme and an effect of different parameters on its accuracy on the basis of actual data obtained at distribution system substations.

9

Influence of the environment on long term reliability of electrical installation clamps

Kopča M., Poljovka P.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

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2006

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Vol. 315, z. 56

315-321

EN

Electrical installation clamps provide a long term conductive connection. During their operation in power distribution systems these contact components are exposed to the influence of a wide spectrum of internal and external degradation factors. The objective of the paper is the verification of the features of progressive contact components with a cage clamp (WAGO system) in various conditions. Experimental results and evaluation methodology of degradation of contact components are a part of the designed controlled ageing system for nuclear power plants.