27-09-2012, 12:06 PM
SWITCH YARD
SWITCH.docx (Size: 475.5 KB / Downloads: 36)
Introduction-:
A switchyard is essentially a hub for electrical power sources. For instance a
switchyard will exist at a generating station to coordinate the exchange of power
between the generators and the transmission lines in the area. A switchyard will
also exist when high voltage lines need to be converted to lower voltage for
to consumers. From switch yard power is distributed to the various department of power plant and supplied to grid. Switchyard consists of the air insulated aluminium bus type and of high voltage SF6 –insulated dead tank circuit breakers arranged in a ring bus configuration.Each circuit breaker are equipped with a no-load breaker, air insulated switch on each side. An isolating disconnect switch are installed in each generator transformer connection to the bus. In switchyard, a power transformer is used to step up or step down the voltage. Current voltage transformers are located at points within the switch yard to provide for metering and relaying. Control, protection and monitoring for the switch yard will be located in the switch yard relay room of electrical building. Interface with SCADA system are provided. The communication between the facility switch yard and the control building facilitated.
SWITCHYARD TYPE-:
(i)Conventional Air Insulated Type
(ii)Gas Insulated Type
(iii)Hybrid Type
(I)Conventional Air Insulated Type-:
In Air Insulated Switchyard busbars and connectors are visibe. In this
switchyard Circuit Breakers and Isolators, Transformers, Current Transformers
Potential Transformers etc are installed in the outdoor. Bus bars are supported
on the post Insulators or Strain Insulators. Substations have galvanized steel
structures for supporting the equipment, insulators and incoming and outgoing
lines are the primary criteria for these switchyard and occupy a large area for
installation.
(II)Gas Insulated Type-:
In Gas Insulated switchyard various equipments like Circuit Breakers, Current
Transformers, Voltage Transformers, Bus bars, Earth Switches, Surge Arrestor
Isolators etc are in the form of metal enclosed SF6 gas modules. The modules are
assembled in accordance with the required Configuration. The various live parts
are enclosed in the metal enclosures (modules) containing SF6 gas at high pressure. Thus the size of Power Substation reduces to 8% to 10% of the air insulated power substation.
(III)Hybrid Type-:
Hybrid switchyard are the combination of both conventional and Gas
insulated substation. Some bays in a switchyard are Gas Insulated Type and some are air insulated type. The design is based on convenience, Local
Conditions available, area available and Cost.
SWITCH.docx (Size: 475.5 KB / Downloads: 36)
Introduction-:
A switchyard is essentially a hub for electrical power sources. For instance a
switchyard will exist at a generating station to coordinate the exchange of power
between the generators and the transmission lines in the area. A switchyard will
also exist when high voltage lines need to be converted to lower voltage for
to consumers. From switch yard power is distributed to the various department of power plant and supplied to grid. Switchyard consists of the air insulated aluminium bus type and of high voltage SF6 –insulated dead tank circuit breakers arranged in a ring bus configuration.Each circuit breaker are equipped with a no-load breaker, air insulated switch on each side. An isolating disconnect switch are installed in each generator transformer connection to the bus. In switchyard, a power transformer is used to step up or step down the voltage. Current voltage transformers are located at points within the switch yard to provide for metering and relaying. Control, protection and monitoring for the switch yard will be located in the switch yard relay room of electrical building. Interface with SCADA system are provided. The communication between the facility switch yard and the control building facilitated.
SWITCHYARD TYPE-:
(i)Conventional Air Insulated Type
(ii)Gas Insulated Type
(iii)Hybrid Type
(I)Conventional Air Insulated Type-:
In Air Insulated Switchyard busbars and connectors are visibe. In this
switchyard Circuit Breakers and Isolators, Transformers, Current Transformers
Potential Transformers etc are installed in the outdoor. Bus bars are supported
on the post Insulators or Strain Insulators. Substations have galvanized steel
structures for supporting the equipment, insulators and incoming and outgoing
lines are the primary criteria for these switchyard and occupy a large area for
installation.
(II)Gas Insulated Type-:
In Gas Insulated switchyard various equipments like Circuit Breakers, Current
Transformers, Voltage Transformers, Bus bars, Earth Switches, Surge Arrestor
Isolators etc are in the form of metal enclosed SF6 gas modules. The modules are
assembled in accordance with the required Configuration. The various live parts
are enclosed in the metal enclosures (modules) containing SF6 gas at high pressure. Thus the size of Power Substation reduces to 8% to 10% of the air insulated power substation.
(III)Hybrid Type-:
Hybrid switchyard are the combination of both conventional and Gas
insulated substation. Some bays in a switchyard are Gas Insulated Type and some are air insulated type. The design is based on convenience, Local
Conditions available, area available and Cost.