Tag Archives: 66 kV Switchyards

66 kV Switchyards: Scope of Project and Objectives

Scope of Project: Existing 7 MVA replacement (5 MVA and 2 MVA 66 kV: 2.4 kV transformers) switch-yards with novice 66 kV switchyards in turn consisting of 2 new 10 MVA DSC 66 kV: 12.47 kV transformers. There are 2 new 12.47 kV switchgear line-ups, new building of substation and civil work sites. There is installation of 3 new 12.47 kV, 266.8 kcmil lines of transmission being fed out from new substations or switchyards. Financials and schedules of project: Cost controlling budgets and scope definition of project estimates has been completed thereby by AMPS services. Cost controlling budgets were estimated at Dollar 3.59 million. Total actual inclusive project’s completion costs were Dollar 3.62 million. EPCM projects schedules were in turn developed by services of AMPS. Scheduled beginning date was 2010, January 15. Completion date was 2010, September 17. Project completion’s actual date was 2010, September 2. This was with total plant down timing of 14 hours. Project’s beginning schedules and plant’s out aging down timing was reduced both with engineering innovative and effective construction/project management.

Objectives: EPCM’s newly increased capacities switchyards or substations have capabilities to run mining sites from plenty of feeds. This minimizes down time potentially by maintaining high levels of configurability. There is responsibility for all electrical, civil, mechanical and structural design being detailed. Sub-consultants of mechanical, civil and structural engineering are managed, employed and directed by AMPS services. There are responsibilities for nearly all electrical, civil, mechanical and structural management of construction, commissioning or testing, site safety and QC and QA programs. There has to be regulation of line voltages at 12.47 kV because of high incoming voltage variations being supplied from the MB Hydro. There has to be redundancies of control powers by means of using numerous UPS modules and transfer automatic switches. There has to be future expansion capabilities of 3rd DSC transformers and switch gearing with no modification of building. There has to be full customization of data recording and trip settings by means of usages of GE Multilin 750 Feeder Management Relays. There has to be minimization of mined site downstream step stations and hazards of touch by means of usages of grounding of high resistances. There has to be minimization of reduced schedules and out aging times for meeting falls of 2010 plant expansion requirements of power.

66 kV Switch Yards or substations are parts of electrical distribution, generation and transmission systems. Switch yards transforms voltages from high to low or reversed or performing many other crucial functions. In between consumer and generating switch yards, electric powers flow by means of many substations at varied voltage levels. Switch yards are operated and owned by electrical utilities. They may also be owned by large commercial or industrial customer. Switch yards generally are unattended. They rely on SCADA for control and supervision remotely. Switchyards include transformers for changing voltage levels in between low distribution voltage and high transmission’s voltage. This can be at interconnections of 2 varied voltages of transmission. Term switch yard is derived from days before distribution systems became grids. Whilst central generation’s station had become large, small generating plant had been converted to stations of distribution. This receives energy supplies from large plants in place of using own generator. 1st switchyard was connected only to 1 power station. In this generators had been housed with subsidiaries of those power stations. Elements of switch yards: They have generally transformers, switching, and controlling and protection equipment.

In large switchyards, there is usage of circuit breakers for interrupting short circuits or currents overloaded which occurs on network. Small distribution switch yards use recloser circuit fuses or breakers for protecting circuits of distribution.

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