Busbar

The busbar is a term used in electrical engineering, power supply and high voltage engineering. Under a busbar is meant an array of fibers that serve as a central distribution of electric power, as all incoming and outgoing lines are connected to the busbars.

Single busbar offer the advantage of being particularly clear. To achieve redundancy of multiple busbars are used in switchgear for high voltage normally. In very large plants quadruple busbars are used. This multiple bus bars are then set up in parallel, and may optionally be used. Often busbars are in the longitudinal direction into two or more parts, the so-called blocks or busbar sections divided. Individual portions of a bus bar can be operated so independently. The use of multiple busbars provides the ability to run quiet and restless consumers at various busbars or to switch busbar sections for maintenance -free, while consumers are switched to the other busbars.

Busbars are made of aluminum or copper and are usually uninsulated, which simplifies the assembly of connecting and switching elements. The shock protection must be ensured by the housing of the switching contrast. Since the busbars offer no protection against contact by opening the housing, you will find such plants usually in the main distributions in which access is restricted by further security measures to appropriately trained electricians.

Busbars in high-voltage switchgear

In substations the connection of the cables and transformers made ​​to the busbar through so-called panels, which are usually constructed identically. In high-voltage systems, a field usually consists of a number of busbar disconnectors (corresponding to the number of parallel busbars ), the current and voltage transformers or combined transformer, the circuit breaker and the line separator ( also called severance separator ). With the help of duplicate busbar disconnectors you can put the finish on different busbars.

One can distinguish between the following field types:

• Outgoing feeders: These outgoing or incoming wires are connected. A special case is the outgoing field, in which the transition from a bare busbar is on an underground cable.
• Transformer feeder panels: Moves, are connected to the power transformers.
• Dome fields: With their help busbars along with each other, are connected transversely and diagonally.
• Transducer arrays: In the transducer arrays current and / or voltage transformer operated, often referred to as so-called combined converter. Thus, these busbar panels are used to measuring electrical quantities, and often also the protection of the busbar and operated on them electrical equipment.

Other busbar systems

In addition to the high-voltage engineering, the term bus is also often used in low-voltage technology for rail systems in sub-distributions. In the electrical installation of an apartment a busbar practically corresponds to the connection of the circuit breakers and residual current circuit breaker in the fuse box. There are one to four and pole comb-type busbars. The circuit breakers provide handy represents the disposals or switching fields

Steam power plants are partially constructed as a " busbar ", which means that multiple boiler feed their steam in a steam - busbar, can be supplied from the plurality of turbines.