0
It provides stability in case of problems with disconnectors auxiliary contacts (stuck contacts or wiring problems). Ir relies on the feeder currents in the busbar.
Disconnectors positions are not required.
There is no selectivity using check zone. It's usefully because it prevents external faults to be considered as a busbar fault.
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
The purpose of the bus bar protection unit is to isolate any bus by tripping its contactor or isolate a faulty bus in the variable ac system?
The Bus Bar is (usually 3, or 4) solid copper bars that run through an MCC (Motor Control Center) and just supply power to the individual 'buckets' (compartments that contain the individual motor starters). The only protection for a bus bar would be from the 'Panelboard', or 'Switchboard' breaker that feeds the bus bar mounted in a separate MCC. Make Sense???, let me know if not...
What is the bus bar size for 6000A?
5-6x150 Cu. BUS BAR PER PHASE
Why the impedance of infinite bus bar is zero?
...because it is an infinite bus bar, meaning it can supply infinite current. By Ohm's law, since the voltage at the bus bar is fixed, to have infinite current, you must have a zero impedance.
Bus bar differential protection relay?
SEL-387 (4 current sets), SEL-387B (6, can be combined with three units for total of 18), CA-16 is an older electromechanical type bus dif relay. I'm not familiar with other brands, but there are many others made by ABB, GE, etc.
Compressed air system for bus bar?
To avoid accumulation of moisture.
The purpose of the bus bar protection unit is to isolate any bus by tripping its contactor or isolate a faulty bus in the variable ac system?
The Bus Bar is (usually 3, or 4) solid copper bars that run through an MCC (Motor Control Center) and just supply power to the individual 'buckets' (compartments that contain the individual motor starters). The only protection for a bus bar would be from the 'Panelboard', or 'Switchboard' breaker that feeds the bus bar mounted in a separate MCC. Make Sense???, let me know if not...
What Happen if BUS BAR Protection relay fails?
In the event of a busbar fault, the next level of protection will operate and disconnect the busbars.
About bus bar protection ques and ans?
Protection of busbars is mainly done using differential relays. These relays sense current flowing into the bus and current flowing out of the bus. If current in != current flowing out, the relay assumes there is a fault on the bus and trips breakers to isolate the bus.
What is pillars?
feeder pillars are used for distribution of electrical supply to customer in which having a such arrangement that the Incomer with Protection (MCB, SFU,MCCB) from this protection the O/G is connected to the Bus bar and from bus bar the O/G are provided to customer,
How can you calculate the copper bus bar according to the amp?
To obtain the amp of the copper bus bar, multiply the width of the bus bar by the thickness of the bus bar to obtain the current carrying capacity of the bus bar.
What is feeder pillar?
feeder pillars are used for distribution of electrical supply to customer in which having a such arrangement that the Incomer with Protection (MCB, SFU,MCCB) from this protection the O/G is connected to the Bus bar and from bus bar the O/G are provided to customer,
What is the bus bar size for 6000A?
5-6x150 Cu. BUS BAR PER PHASE
What are the types of bus bar arrangements?
Single bus is used in smaller, less important substations. A fault on the bus requires tripping of all lines into the bus. When higher redundancy is necessary, ring and breaker and 1/2 schemes are used. These are the three most common.
What is a bus zone?
candy land
What does the term 'bus bar' refer to?
The term "bus bar" refers to a strip of bar of brass, aluminum, or copper. This strip of bar conducts electricity with a distribution and switch board.
How do you convert bus bar to amp?
Bus bar is a physical component that carries the current. AMP is unit of current. They can not be converted
Why the impedance of infinite bus bar is zero?
...because it is an infinite bus bar, meaning it can supply infinite current. By Ohm's law, since the voltage at the bus bar is fixed, to have infinite current, you must have a zero impedance.
