44 Advantage of vacuum CB * Used up to 66 KV. * Vacuum is highly dielectric, so arc can’t persists. * Separation of contacts causes the release of metal vapour. Source:Electric Substation Types The main purposes for establishment of a substation are: * Need for connecting a generator to the transmission system: We . Replacement of the existing 7 MVA (2 MVA & 5 MVA 66kV: kV transformers) switchyard with a new 66 kV switchyard consisting of two new 10 MVA DSC
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In some special cases a collector substation can also contain an HVDC converter station. Each sub bank shall be provided with motorized 11KV Isolator. In this case the generators from the power station supply their power into the k.c.switchyard onto the Generator Bus on one side of the yard, and the transmission lines take their power from k.v.swithcyard Feeder Bus on the other side of the yard. Views Read Edit View history. A substation is a part of an electrical generationtransmissionand distribution system.
A small “switching station” may be little more than a bus plus some circuit breakers.
Electrical substation – Wikipedia
They are designed to be compact for travel on public roads, and are used for temporary backup in times of natural disaster or war.
Substations transform voltage from high 66 low, or the reverse, or perform any of several other important functions. A disconnect switch is used to provide isolation, since it cannot interrupt load current.
The Ni-Cd Battery bank shall be installed in separate room with proper ventilation system as per safety requirement. Registration Forgot your password? A transmission substation connects two or more transmission lines.
Specification For Erection, Testing and Commissioning Of 66/11 kV Grid Substation | EEP
The downtown areas of large cities feature complicated distribution substations, with high-voltage switching, and switching and backup systems on the low-voltage side. Speed – Ability to disconnect the faulty part at the k.v.ewitchyard possible time. Switching events may be planned or unplanned. The metering and protection relays shall be part of switchgear only. Lightning Masts, Earth wires.
Generator, GT etc economic conditions are subordinated to reliability.
They feed synchronizing equipment. The battery charger shall be thyristor controlled installed inside control room building ad should be compatible with SCADA System. List of electricity sectors Electric energy consumption. Smaller k.v.swihchyard stations may use recloser circuit breakers or fuses for protection of distribution circuits.
Sometimes they are also transmission substations or collector substations if the railway network also operates its own grid and generators to supply the other stations. A compact substation is generally an outdoor substation built in a metal enclosure, in which k.v.swktchyard item of the electrical equipment is located very near to each other to create a relatively smaller footprint size k.v.switchyarx the substation. Archived from the original PDF on 5 February Former high-voltage substation in Stuttgart, Germany, now kV switching station.
High-rise buildings may have several indoor substations. Selection of the location of a substation must consider many factors.
A circuit breaker is used as a protection device to interrupt fault currents automatically, and may be used to switch loads on and off, or to cut off a line when power is flowing in the ‘wrong’ direction. Distribution voltages are typically medium voltage, between 2. Outdoor, above-ground substation structures include wood pole, lattice metal tower, and tubular metal structures, although other variants are available. Instead of bare conductors, bus and apparatus are built into pressurized tubular containers filled with sulfur hexafluoride SF 6 gas.
The secondary of the aux PT is taken for measurement and protection. The collector substation can also provide power factor correction if it is needed, metering, and control of the wind farm.
The first substations were connected to only one power stationwhere the generators were housed, and were subsidiaries of that power station. K.v.zwitchyard are sets of busbarsusually in multiples of three, since three-phase electrical power distribution is largely universal around the world.