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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When a large k.v.switchyad current flows through the circuit breaker, this is detected through the use of current transformers. The downtown areas of large cities feature complicated distribution substations, with high-voltage switching, and switching and backup systems on the low-voltage side. These categories are not disjointed; for example, to solve a particular problem, a transmission substation may include significant distribution functions.

Converter substations may be associated with HVDC converter plants, traction currentor interconnected non-synchronous networks. Once past the switching components, the lines of a given voltage connect to one or more buses.

Modern substations may be implemented using international standards such as IEC Standard 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.

In this case the generators from the power station supply their power into the yard onto the Generator Bus on one side of the yard, and the transmission lines take their power from a Feeder Bus on the other side of the yard.

SWITCHYARD www.powerpointpresentationon.blogspot.com.

Formerly rotary converters changed frequency to interconnect two systems; nowadays such substations are rare. In a large substation, circuit breakers are used to interrupt any short circuits or overload currents that may occur on the network. The feeders run along streets overhead or underground, in some cases and power the distribution transformers at or near the customer premises. With overhead transmission linesthe propagation of lightning and switching surges can cause insulation failures into substation equipment.


Switching events may be planned or unplanned. Line entrance surge arrestors are used to protect substation equipment accordingly. The content is copyrighted to EEP and may not be reproduced on other websites.

These will again have a circuit breaker, much like transmission lines, in case a transformer has a fault commonly called a “short circuit”. Two sets of Capacitor bank shall be installed outdoor.

66 KV Switchyard | HMEL

A small “switching station” may be little more than a bus plus some circuit breakers. Sometimes they are used for switching the current to back-up lines or for parallelizing circuits in case of failure. Circuit Breakers and Recloser. Indoor substations may be gas-insulated switchgear at high voltagesor metal-enclosed or metal-clad switchgear at lower voltages.

In some cases a conversion of the current type takes place, commonly with rectifiers for direct current DC trains, or rotary converters for trains using alternating current AC at frequencies other than that of the public grid.

Wikimedia Commons has media related to Electrical substation. The arrangement of switches, circuit breakers, and buses used affects the cost and reliability of the substation. De-energizing faulty equipment protects it from further damage, and isolating a fault helps keep the rest of the electrical grid operating with stability.

Apparatus to be protected: Control voltage shall be V DC. Smaller distribution stations may use recloser circuit breakers or fuses for protection of distribution circuits. Speed – Ability to disconnect the faulty part at the earliest possible time.


A transmission substation connects two or more transmission lines. A switching station may also be known as a switchyard, and these are commonly located directly adjacent to or nearby a power station.

Where a substation has a k.v.switchhyard fence, it must be properly grounded to protect people from this hazard. Examples for such substations are Brauweiler in Germany and Hradec in the Czech Republic, where power is collected from nearby lignite -fired power plants.

Between the generating station and consumer, electric power may flow through several substations at different voltage levels. To use this k.v.switchyad, you must agree to our Privacy Policyincluding cookie policy. Insulator Rod gap Equipment body.

Each sub bank shall be provided with motorized 11KV Isolator. Substations may be owned and operated by an electrical utility, or may be owned by a large industrial or commercial customer. The input for k.v.switchyadr distribution substation is typically at least two transmission or sub-transmission lines.

Early electrical substations required manual switching or adjustment of equipment, k.v.sitchyard manual collection of data for load, energy consumption, and abnormal events. A compact substation is generally an outdoor substation built in a metal enclosure, in which each item of the electrical equipment is located very near to each other to create a relatively smaller footprint size of the substation.

Environmental effects of the k.v.switchhard must be considered, such as drainagenoise and road traffic effects. They are designed to be compact for travel on public roads, and are used for temporary backup in times of natural disaster or war.