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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A disconnect switch is used to provide isolation, since it cannot interrupt load current. These categories are not disjointed; for example, to solve a particular problem, a transmission substation may include significant distribution functions.

The battery charger shall be thyristor controlled installed inside control room building ad should be compatible with SCADA System. In distributed generation projects such as a wind farma collector substation may be required. k.v.dwitchyard

All work to be performed, from routine testing to adding entirely new substations, should be done while keeping the whole system running. Restriking Voltage —After the arc has been extinguished, the voltage across the breaker terminals does not normalize instantaneously but it oscillates The transient voltage which appears across the breaker contacts at the instant of arc being extinguished.

The total ground potential riseand the gradients in potential during a fault called touch and step potentials[6] must be calculated to protect passers-by during a short-circuit in the transmission system. About project SlidePlayer Terms of Service.

66 KV Switchyard | HMEL

Premium Membership Premium membership gives you an access to specialized technical articles and extra premium content electrical guides and software. 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. The switchgears shall be equipped with Vacuum circuit breaker.


A mobile k.v.switchyars is a substation on wheels, containing a transformer, breakers and buswork mounted on a self-contained semi-trailermeant to be pulled by a truck. An important function performed by a substation is switchingwhich is the connecting and disconnecting of transmission lines or other components to and from the system.

66 KV Switchyard

These stations contain power electronic devices to change the frequency of current, or else convert from alternating to direct current or the reverse. In other projects Wikimedia Commons. Currents 666 in k.v.switcgyard Earth’s surface during a fault can cause metal objects to have a significantly different voltage than the ground under a person’s feet; this touch potential presents a hazard of electrocution.

Converter substations may be associated with HVDC converter plants, traction currentor interconnected non-synchronous networks.

Retrieved 14 December Substations feeding only a single industrial load may have minimal switching provisions, especially for small installations. This seeks to isolate the fault point from the rest of the system, and allow the rest of the system to continue operating with minimal impact.

Substations may be owned and operated by an electrical utility, or may be owned by a large industrial or commercial customer. In some cases, the lines will not have both, with either a switch or a circuit breaker being all that is considered necessary.

The substation site must be reasonably central to the distribution area to be served. Sometimes they are used for switching k.v.witchyard current to back-up lines or for parallelizing circuits in case of failure. It is a switching station which has the following credits: As central generation stations became larger, smaller generating plants were converted to distribution stations, receiving their energy supply from a larger plant instead of using their own generators.


Protection against Lightning Overvoltages Overvoltages due to lightning strokes can be avoided or minimized in practice by d shielding the overhead lines. Where a substation has a metallic fence, it must be properly grounded to protect people from this hazard. Each sub bank shall be provided with motorized 11KV Isolator. It resembles a distribution substation although power flow is in the opposite direction, from many wind turbines up into the transmission grid.

In a large substation, circuit breakers are used to interrupt any short circuits or overload currents that may occur on the network. Insulation Coordination studies are carried out extensively to ensure equipment failure and associated outages is minimal.

Indoor substations may k.v.switfhyard gas-insulated switchgear at high voltagesor metal-enclosed or metal-clad switchgear at lower voltages.

Sufficient land area is required for installation of equipment with necessary clearances for electrical safety, and for access to maintain large apparatus such as transformers. Lightning Masts, Earth wires. Voltage transformers serve a number of functions in a power system.

A small “switching station” may be little more than a bus plus some circuit breakers. They are required for the operation of many types of instrumentation and relay protective systems. So, only used as a back-up.

Page edited by E. The Control supply shall be V DC.

SWITCHYARD www.powerpointpresentationon.blogspot.com.

Arc-fault circuit interrupter Earth leakage circuit breaker Residual-current device GFI Power-system protection Protective relay Digital protective relay Sulfur hexafluoride circuit breaker.

Discharge the voltage trap in line. The main issues facing a power engineer are reliability k.vs.witchyard cost.

Two sets of Capacitor bank shall be installed outdoor.