Main and transfer busbar system

It does the connection of incoming and outgoing transmission lines. Main and Transfer Bus system.

High exposure to bus fault.

Main and transfer busbar system. Main and Transfer Bus System. This is an alternative of a double bus system. The main conception of Main and Transfer Bus System is here every feeder line is directly connected through an isolator to a second bus called transfer bus.

The said isolator in between transfer bus and feeder line is generally called bypass isolator. Such an arrangement consists of two bus-bars known as main bus-bar and transfer bus-bar used as an auxiliary bus-bar. Each generator and feeder may be connected to either bus-bar with the help of bus coupler which consists of a circuit breaker and isolating switches.

The system uses the additional circuit breaker and isolator which increases the cost of the system. Main and Transfer Bus Arrangement. Such type of arrangement uses two type of busbar namely main busbar and the auxiliary bus bar.

The busbar arrangement uses bus coupler which connects the isolating switches and circuit breaker to the busbar. Main and transfer bus bar This arrangement comprises a main bus that is used under ordinary conditions and a transformer bus for emergency purposes. The major advantage associated with this scheme is the use of single circuit breaker for tieing purposes.

Some of the more common bus bar systems include. Single Bus Bar System. Double Bus Bar System.

Double Bus Bar System with Bypass Isolators. Main and Transfer Bus Bar System. In general bus bar systems will have several components and attributes in common with each other such as.

Copper bus bar flat or formed Splice connectors. Extra bus-coupler circuit breaker necessary. Bus protection scheme may cause loss of substation when it operates.

High exposure to bus fault. Line breaker failure takes all circuits connected to the bus out of service. Bus couplers failure takes entire substation out of service.

Bus-bars are mostly used to interconnect the loads and sources of electrical power. It does the connection of incoming and outgoing transmission lines. It also does the connection between the generator and the main transformer of the power system.

A bus-bar is a strip of copper or aluminum that conducts electricity within a switchboard distribution board substation or other electrical apparatus. Busways or bus ducts are long busbars with a protective cover. Rather than branching from the main supply at one location they allow new circuits to branch off anywhere along the route of the busway.

A busbar may either be supported on insulators or else insulation may completely surround it. Main busbar system with connections for incoming busbars and bus-tie from the top Main busbars MNS R main busbars are available for currents up to 6300 A. Main busbars as well as distribution busbars can be completely segregated.

Each MNS R panel can be fitted with three busbar systems at the same time top-cen-tre-bottom each segregated from the others. Main and Transfer Bus Arrangement. In the Main and Transfer bus arrangements such as a device two buses are used namely the main bus and the auxiliary bus.

The busbar uses a busbar connector that connects the isolating switches and the circuit breaker to the busbar. It is an alternative to the dual bus system. MAIN AND TRANSFER BUS.

This is an alternative to double bus single breaker arrangement which provided for change over to either bus for carrying out maintenance on other bus. But it provided no facility for breaker maintenance without interrupting power supply to the concerned circuit. The main and transfer bus works the other way round.

ABB Network Partner High-speed busbar transfer HBT 1MRB520156-Aen Page 2 Application Fig. 1 Standard high-speed bus transfer schemes High-speed busbar transfer The purpose of the high-speed busbar transfer system HBT is to switch motor busbars over to an intact backup supply should the main supply fail and to switch them back. The power from main bus can be totally transferred to auxiliary bus bar as needed through bus coupler since there will be high degree of reliability.

While transferring the load to reserve bus. Close the bus coupler. Close isolators on the reserve bus.

Open isolators on the main bus. Cost index for this type of arrangement is 16. The advantage and disadvantage of single busbar system are given below.

Advantage-It is the cheapest installation as only one circuit breaker for each outgoing circuit is required. Due to the absence of the transfer bus breakers and disconnector the operation has become simple. It is possible to utilize the busbar potential for the line relays.

Main and Transfer Bus system. Main Bus is always distributing the power to the load circuit. When the loads exceed the bus bar capacity then some of the load will be transferred to the transfer bus.

The transfer bus work as stand by for the main bus. Such bus scheme is used in distribution substations. Main and transfer busbar- two busbars with a coupler that can close or open them.

Double busbar- two units not coupled being connected to output lines the line have circuit breakers and can take power from either busbar. Sectionalized double busbar- integrates the operation of sectionalized and double busbar. In 400 kV One and half Breaker system Main-1 and Main-2 protection scheme is adopted instead of Main and Back-up.

This means there will be two relays of preferably two different make to protect the same zone. Like there will be two different STUB relays.