[en] A preliminary survey was made of power-frequency magnetic field levels inside and outside of Cecil transformer station (TS), a 115 kV/13.8 kV substation in downtown Toronto. Cecil TS is supplied from the Ontario Hydro system via underground cable and has gas-insulated 115 kV switchgear. General background fields inside and outside the station are below 1 μT. Outside the station, field levels between 5 and 10 μT were observed directly over buried single-conductor cables and distribution feeders. Inside the station, field levels increased in proximity to the electrical equipment, with field levels up to 100 μT close to the 115 kV single-conductor cables and 13.8 kV busses. Electrical equipment inside the station appeared to have little effect on the 60 Hz magnetic environment outside the station boundaries. 10 figs

[en] The electric and magnetic field issue has become an area of increasing public concern. Utilities have been carrying out extensive projects to characterize and manage the magnetic fields around their substations in an effort to answer public concerns over the possible health hazard caused by these fields. This paper describes various techniques available for managing magnetic field strength levels in substations. The design guideline aids in the planning, design, construction of substation facilities. Low-frequency magnetic field is directly associated with current-carrying sources and its magnitude is proportional to the distance from the sources. Distribution substations in high-rise buildings are very close to public areas and the magnetic fields imposed by these substations might be relatively higher than that imposed by outdoor substations. Options to manage these substations fields are considered in this paper. Techniques to manage magnetic fields in substations such as: source relocation, compaction, rephasing, return-current control, passive and active shielding are discussed. Several techniques were applied to reduce the magnetic fields in the conference room located in the main floor above a substation located in the basement of the main office high-rise building of LADWP. 10 refs, 14 figs, 3 tabs

[en] This document records the steps taken and results of the acceptance testing of the new 13.8kV switchgear installed at 251W. This gear is under the administrative control of Electrical Utilities

[en] This paper examines estimation of the extremely low frequency magnetic fields (MF) in the power substation. First, the results of the previous relevant research studies and the MF measurements in a sample power substation are presented. Then, a fuzzy logic model based on the geometric definitions in order to estimate the MF distribution is explained. Visual software, which has a three-dimensional screening unit, based on the fuzzy logic technique, has been developed. (authors)

[en] Delivery of power from Manitoba's proposed Conawapa power plant and other sources in the north of the province will require conversion of ac to dc for transmission to southern Manitoba. This conversion will take place at the Henday Converter Station on the Nelson River. The existing station requires upgrading by extension of the ac switchyard for termination of 230 kV transmission lines from Conawapa; development of additional ac/dc conversion facilities; construction of an additional dc switchyard for a new high voltage dc transmission line known as Bipole III; and construction of a new electrode line to an existing grounding site southwest of Henday. A status report is presented which provides an information base for public and community consultation on the proposed Henday upgrade. Station design, upgraded facilities and their location, and land use associated with the upgrade are described. The employment and business opportunities, biophysical impacts, and transportation of workers and equipment to the site are discussed as short-term effects of the upgrade. Long-term effects are seen as insignificant and incremental to current operations at the site. Adverse effects that could occur are considered mitigable with the use of existing and proven technology. 6 figs

[en] The study of natural disturbance lighting and protection against is very important in protection of substation. For designing and analysis of lightning protection of substations, a computer program has been developed with the help of Matlab in graphical user interface (GUI). Shield wire scheme has been implemented for lightning protection. Economical criterion has been given the major preference in this computer application while maintaining the protection. This computer application Matlab tool can quickly design lightning protection for Substation and it may prove to be very helpful for design engineers in the field. In this paper methodology and inputs/outputs of the developed program tool is presented. This study also shows an example of local Rohri substation with results and developed program tool proved to be useful as discussed in conclusion. (author)

[en] In Ontario, the ownership of transformer stations is an area of debate for two reasons. Municipal utilities are solely concerned with supply to their own customers while Ontario Hydro bases its planning and construction on the most inexpensive power rates for the province as a whole. An underbuilding of the transmission system in the 1980s due to low load forecasts has resulted in low capacity in fast-growing municipalities such as Vaughan. The town of Vaughan commissioned its first 230-kV transformer station in June 1989 and will build more if its current growth rate of ca 17% continues. Ontario Hydro levies transformation costs on power sold to municipal utilities, which are eliminated if the municipal utility owns the transformer station. A large municipality that pays as much as $600,000/y in transformation costs could reduce these costs by up to 25% by owning its own station. Costs for such stations are lower for municipalities because they only pay costs of existing technology, can construct using non-union labor, and can build to lower standards than Ontario Hydro. In addition, owning their own stations can give municipalities a flexibility that Ontario Hydro may not have in the case of a large customer moving into a given area. Municipalities also have shorter-term planning timeframes than Ontario Hydro's 8-10 years for transmission systems. The Municipal Electrical Association is in the process of finalizing an agreement with Ontario Hydro to address the ownership question. 1 fig

[en] Proposed action is to construct at BNL a 5,600-ft² support building, install and operate a prototypic 200 MeV accelerator and a prototypic 700 MeV storage ring within, and to construct and operate a 15 kV substation to power the building. The accelerator and storage ring would comprise the x-ray lithography source or XLS

[en] This work is aimed at studying the noise caused by the transformers found in electrical substations located in calm areas in the city of Curitiba, Brazil. Although the level itself reaching the nearby buildings is not high if compared to other noise sources commonly found in a large city, they produce an annoying noise due to its low frequency tonal components. Two substations and their surroundings have been analyzed and acoustically mapped. The results have shown that some houses receive up to 35 dB(A) near one of the substations, which may led to some discomfort. It has also been noticed that a good planning of a substation, mainly of the firewalls, may help putting the houses under acoustical shadows. (Author)

[en] The magnetic fields generated by a typical distribution substation were measured and calculated based on a computer model which takes into account currents in the grounding systems, distribution feeder neutrals, overhead ground wires and induced currents in equipment structures and ground grid loops. Both measured and computer results indicate that magnetic fields are significantly influenced by ground currents, as well as induced currents in structures and ground system loops. All currents in the network modeled were computed, based on the measured currents impressed at the boundary points (ends of the conductor network). The agreement between the measured and computer values is good. Small differences were observed and are attributed mainly to uncertainties in the geometry of the network model and phase angles of some of the currents in the neutral conductors which were not measured in the field. Further measurements, including more accurate geometrical information and phase angles, are planned