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Advantages And Components Of A New To Hydro One

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Pad mount distribution stations are relatively new to Hydro One so that there are only four stations of this kind in existence to date with the first design implemented in 2010 at Holland DS. This type of station is normally used where a safe, reliable, and aesthetically appealing design with smaller footprint is needed. Pad mount DS operates on distribution systems, up to 44kV and 10MVA. Most of the electrical components are pad mounted and are usually known as “dead front” equipment. The Canadian Electrical Code (CEC) defines dead front as electrical equipment “without live parts exposed to a person on the operating side of the equipment”. As shown in Figure #, power transformer, 6-way load break switch, recloser, and station service …show more content…

The 44kV entrance supply can be overhead or underground. Normally this supply is first connected to the MUS pole for MUS connection and then to the HV switch & fuse structure via overhead conductors. There are three mid-span openers installed in between the MUS pole and the HV Switch &fuse structure for station isolation, when MUS is connected. Additionally, power distribution throughout the station is carried out by direct buried, underground cables connecting every electrical component, having concrete vaults under LV load break interrupter, reclosers, and station service transformer. The LV cables are connected to equipment bushings via dead-break elbow connectors, which require to be disconnected only when not under load. Furthermore, it is important to mention that the Puffer Pak ® is a dead front pad mount load break disconnect switch used to distribute power from the three-phase transformer to each of the reclosers and SST. Depending on the design requirements, the Puffer Pak ® can have 5 or 6 switched ways. Examples of Pad mount DS designs that can be found on Meridian are: • Holland DS: 44kV-27.6, 10MVA pad mount transformer • Rosseau DS: 44kV-12.48kV, 7.5MVA pad mount

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