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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 addition to transforming voltage, distribution substations also isolate faults in either the transmission or distribution systems. Connected between Line conductor and Earth whenever required. The switchgears shall be equipped with Vacuum circuit breaker.

Between the generating station and consumer, electric power may flow through several substations at different voltage levels. 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.

Former high-voltage substation in Stuttgart, Germany, now kV switching station. By using this site, you agree to the Terms of Use and Privacy Policy. Voltage transformers serve a number of functions in a power system.

Substations may be on the surface in fenced enclosures, underground, or located in special-purpose buildings. The secondary of the aux PT is taken for measurement and protection.

With overhead transmission linesthe propagation of lightning and switching surges can cause insulation failures into substation equipment. 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.

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In a common design, incoming lines have a disconnect switch and a circuit breaker. Switches, circuit breakers, transformers and other apparatus may be interconnected by air-insulated bare conductors strung on support structures.

Urban and suburban indoor substations may be finished on the outside so as to blend in with other buildings in the area. Where land is costly, such as in urban areas, gas insulated switchgear may save money overall. 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. Low-profile substations may be specified in suburban areas where appearance is more critical.

They are designed to be compact for travel on public roads, and l.v.switchyard used for temporary backup in times of natural disaster or war. Where a substation has a k.v.swktchyard fence, it must be properly grounded to protect people from this hazard.

Line entrance surge arrestors are k.v.swithyard to protect substation equipment accordingly.

Electrical substation

Unplanned switching events are caused by a fault in a transmission line or any other component, for example:. We think you have liked this presentation. Power-line carriermicrowave radiofiber optic cables as well as dedicated wired remote control circuits have all been applied to Supervisory J.v.switchyard and Data Acquisition SCADA for substations.

If you wish to download it, k.v.swotchyard recommend it to your friends in any social system. The content is copyrighted to EEP and may not be reproduced on other websites.

Archived from the original PDF k.v.swltchyard 5 February For important substations a ring bus, double bus, or so-called “breaker and a half” setup can be used, so that the failure of any one circuit breaker does not interrupt power to other circuits, and so that parts of the substation may be de-energized for maintenance and repairs. Earth faults at a substation can cause a ground potential rise. They measure voltage and in conjunction with CTthey measure power.


They are required for the operation of many types of instrumentation and relay protective systems. Feedback Privacy Policy Feedback.

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List of electricity sectors Electric energy consumption. Distributed automatic control at substations is one element of the so-called smart grid. Early electrical substations required manual switching or adjustment of equipment, and manual collection of data for load, energy consumption, and abnormal events.

Substations may be described by their voltage class, their applications within the power system, the method used to insulate most connections, and by the style and materials of the structures used. Indoor substations may be gas-insulated switchgear at high voltagesor metal-enclosed or metal-clad switchgear at lower voltages. If no transformers are required for increasing the voltage to transmission k.v.switchyadr, the substation is a switching station. Each set shall be 7.

A grounding earthing system must be designed. Insulation Coordination studies are carried out extensively to ensure equipment k.v.swtichyard and associated outages is minimal. The input for a distribution substation is typically at least two transmission or sub-transmission lines.

SWITCHYARD – ppt download

Insulator Rod gap Equipment body. Transmission k.v.swithyard can range from simple to complex. Today, standardized communication protocols such as DNP3IEC and Modbusto list a few, are used to allow multiple intelligent electronic devices to communicate with each other and supervisory control centers. Both switches and circuit breakers may be operated locally within the substation or remotely from a supervisory control center.

They feed synchronizing equipment.