In this bus configuration for two circuits three numbers of breakers are required. Hence it is called one and half scheme. It is something like, for controlling one circuit we require one full and a half breakers. The middle breaker is shared by both the circuits.
Q. How is one and half bus scheme similar to ring bus scheme?
Q. Why is it called breaker and a half?
6. Breaker and Half. This configuration uses two main buses, both of which are normally energized with three breakers connected between the buses. In this bus configuration, three breakers are required for every two circuits – hence the “one and half” name.
Q. What do you mean by switchgear?
What is switchgear? Electrical switchgear refers to a centralized collection of circuit breakers, fuses and switches (circuit protection devices) that function to protect, control and isolate electrical equipment.
Table of Contents
- Q. How is one and half bus scheme similar to ring bus scheme?
- Q. Why is it called breaker and a half?
- Q. What do you mean by switchgear?
- Q. What is bus switching scheme?
- Q. How many breakers are needed In one and half bus scheme?
- Q. What’s the difference between double bus and single breaker?
- Q. How are the Breakers in a ring bus system?
Q. What is bus switching scheme?
This is essentially a single bus scheme with bus section breaker and an extra bus coupler breaker with bypass disconnect switch facilities. When circuit breakers are under maintenance the protection is arranged to trip the bus-coupler breaker.
In power engineering, a “bus” is any graph node of the single-line diagram at which voltage, current, power flow, or other quantities are to be evaluated. A ground bus or earth bus is a conductor used as a zero voltage reference in a system, often connected to ground or earth.
Q. How many breakers are needed In one and half bus scheme?
Hence it is called one and half scheme. It is something like, for controlling one circuit we require one full and a half breakers. The middle breaker is shared by both the circuits. Like the ring bus scheme here also each circuit is fed from both the buses.
Q. What’s the difference between double bus and single breaker?
In double bus single breaker the second bus(transfer) is designed to carry full load as the main bus and therefore full rating, whereas the main-transfer scheme envisages only temporary use of transfer(second) bus and therefore a lower rating.
Q. How are the Breakers in a ring bus system?
The Ring Bus configuration is shown in Fig-F. The breakers are so connected and forms a ring. There are isolators on both sides of each breaker. Circuits terminate between the breakers. The number of breakers is same as the numbers of circuits. Each of the circuits in ring bus system is fed from both sides.
