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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Indoor substations may be gas-insulated switchgear at high voltagesor metal-enclosed or metal-clad switchgear at lower voltages. By using this site, you agree to the Terms of Use and Privacy Policy. Switches, circuit breakers, transformers and other apparatus may be interconnected by air-insulated bare conductors strung on support structures. A grounding earthing system must be designed.

SWITCHYARD – ppt download

The switchgears shall be equipped with Vacuum circuit breaker. The first substations were connected to only one power stationwhere the generators were housed, and were subsidiaries of that power station. Apparatus to be protected: Control voltage shall be V DC.

Line entrance surge arrestors are used to protect substation equipment accordingly. These will again have a circuit breaker, much like transmission lines, in case a transformer has a fault commonly called a “short circuit”. Once past the switching components, the lines of a given voltage connect to one or more buses. Discharge the voltage trap in line. Collector substations also exist where multiple thermal or hydroelectric power plants of comparable output power are in proximity.


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. The battery charger shall be thyristor controlled installed inside control room building ad should be compatible with SCADA System. Page edited by E.

The input for a distribution substation is typically at least two transmission or sub-transmission 66. A switching station is a substation without transformers and operating only at a single voltage level. Premium Membership Get access to premium electrical guides, technical articles and k.v.swithcyard more!

66 KV Switchyard | HMEL

As result the arc dia reduces and comes to zero at current zero. Electric power Electric power infrastructure. To make this website work. kv.switchyard log user data and share it with processors. Circuit Breakers and Recloser. Substations located in coastal areas affected by flooding and tropical storms may often require an elevated structure to keep equipment sensitive k.v.swigchyard surges hardened against these elements.

More typical distribution substations have a switch, one transformer, and minimal facilities on the low-voltage side.

They can be used as coupling capacitors in power line carrier network. Substations may be owned kk.v.switchyard operated by an electrical utility, or may be owned by a large industrial or commercial customer. 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 kv.switchyard 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. 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. In such cases, substation contains high-voltage switches that allow lines to be connected or k.v.switchyqrd for fault clearance or maintenance.


With overhead transmission linesthe propagation of lightning and switching k.v.switchyadd can cause insulation failures into substation equipment. In distributed generation projects such as a wind farma collector substation may be required. Substations Chapter 4 Substations Major types of equipment found in most transmission and distribution substations with their purpose.

The development of the microprocessor made for an exponential increase in the number of points that could be economically controlled k.v.saitchyard monitored.

About project SlidePlayer Terms of Service. Once having established buses for the various voltage levels, transformers may be connected between the voltage levels. An important function performed k.v.switchyatd a substation is switchingwhich is the connecting and disconnecting of transmission lines or other components to and from the system. Feedback Privacy Policy Feedback. Substations generally have switching, protection and control equipment, and transformers. Transmission substations can range from simple to complex.


Breaking Capacity Max fault current at which a CB is capable of breaking a circuit. Retrieved 11 October The kV level k.v.swjtchyard eliminated for grid simplification. Where a substation has a metallic fence, it must be properly grounded to protect people from this hazard. A substation is a part of an electrical generationtransmissionand distribution system.

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