How can we protect the busbar?
Busbar protection schemes
- System protection used to cover busbars.
- Frame-Earth Protection. Single-Busbar Frame-Earth Protection. Frame-Earth Protection (Sectioned Busbars)
- Differential protection for busbars. High Impedance Differential Protection.
- Reverse blocking / interlocking protection.
What is busbar protection panel?
Busbar protection is a protection scheme meant to protect the busbar from electrical fault. Various feeders are connected to a busbar through circuit breaker in any of the bus configuration viz. Double Busbar arrangement or one and half breaker scheme.
Why is busbar protection needed?
To maintain system stability, the primary objective of busbar protection is to limit damage and remove busbar faults before back-up line protection. A low impedance differential system used to have a relatively long operation time.
Which protection is used for the earth fault protection of bus bar?
Current Differential Protection. The scheme of busbar protection, involves, Kirchoff’s current law, which states that, total current entering an electrical node is exactly equal to total current leaving the node. Hence, total current entering into a bus section is equal to total current leaving the bus section.
What are the two types of protection given for busbar?
This type of busbar protection has two types: low-impedance biased differential protection and high-impedance differential protection, as described here.
What is bus zone protection?
Bus Zone Protection includes, besides the bus itself the apparatus such as circuit breakers, disconnecting switches, instrument transformers and bus sectionalizing reactors, etc. Although bus zone faults are rare, experience shows that bus zone protection is highly desirable in large and important stations.
What is busbar differential protection?
Differential Protection: The basic method for busbar protection is the differential scheme in which currents entering and leaving the bus are totalised. During normal load condition, the sum of these currents is equal to zero.
What is bus differential protection?
Bus differential protection is based on Kirchhoff’s current law, which states that the sum of currents entering a node is zero. A bus is treated as a node, and current measurements are taken from all terminals connected to the bus. Under normal conditions, the currents sum to zero.
How to protect the bus-bar from fault?
Frame leakage protection. This is the simple way of protecting the bus-bar from the fault. The fault occurs on the bus-bar because of the supplying system. So the backup protection is provided to the supply system. The figure below shows the simple arrangement for the protection of bus-bar.
What are the different types of busbar protection?
Differential type of busbar protections can be divided into three different groups: Low impedance. Medium impedance. High impedance. For metal enclosed distribution busbars, arc detectors also can be used as busbar protection. For systems that are only radial fed blockable overcurrent relays in the incoming bays can be used as busbar protection. 2.
How does the busbar protection work in a substation?
When the check zone detects a fault it gives a release signal to the busbar protection relays in all individual, discriminating zones. The busbar protection discriminating zones will then trip the part of the substation that is faulty.
How can busbars in distribution networks be protected?
For busbars in distribution networks busbar protection can be achieved mainly in two different ways, either by blockable overcurrent protection at the incoming bays to the switchgear, or by locating arc detectors inside the enclosure.