What is a Busduct?
In a power system the reliability for continuous power supply is one of the most important aspects. To ensure this busduct is widely used. Busduct is a sheet metal duct with aluminium or copper bus bars, and used as a reliable link for transferring power from one equipment to other at desired voltage levels. It is used as an alternate means for conducting electricity to cable bus and power cables.
Busduct are classified into various types depending on its application viz isolated phase Busducts, segregated phase busducts, non-segregated phase busducts.
Segregated Phase Busduct
These are metal enclosed busducts wherein all the three phase busbars are enclosed in a common enclosure and the all the phases are segregated by means of non-magnetic metal barriers preferably made of the same materials as that of the bus enclosure with degree of protection IP65.
The barriers are generally welded with the busduct enclosure simulating isolated compartments for each and every phase thus providing adequate shielding effect to the busbars under short circuit conditions due to the induced circulating currents in the enclosure whose phase angle is opposite in nature to that of busbars thus reducing the forces applied on the bus conductors.
Besides the above, the segregation barriers also aid minimizing the phase to phase faults to a great extent. Busbars are generally supported on high creep porcelain insulators are high quality epoxy resin cast insulators of suitable rated voltage
These Segregated phase busducts are commonly used in Medium voltage applications with rated voltages from 3.3KV to 33KV and with rated continuous currents up to 5000 Amps with short circuit fault currents of 50 KA for 1 or 3 seconds.
Widely used as an interconnection between transformer to Switchgears, Switchgear to switchgears and also sometimes used as link between small capacity generators and main transformers under 3 phase, 3 wire configurations.
Non-segregated Phase Busduct
Non-segregated busduct, on the other hand, is almost similar to the above in construction wherein all the phase / neutral conductors are enclosed in a common enclosure with air as medium of insulation between phases. As the name implies, there is no metallic barriers between phases
These busducts are relatively compact in comparison with segregated phase bus since the same are generally used for low voltage applications and thus needing much lower electrical clearances between phases and phase to earth.
At C&S Electric, we offer these non-segregated phase busducts to be used commonly in low voltage distribution with rated voltages up to 1100 Volts and with rated continuous currents up to 6300 Amps with short circuit fault currents of up to 50 KA for 1 second, however on specific request up to 80KA.
Widely used as an interconnection between transformer to Switchgears, Switchgear to switchgears and also sometimes used as link between low voltage diesel generators and transformers under 3 phase, 3 wire / 4 wire configurations.
These non-segregated phase busducts are offered in two variants-one with conventional design with R Y B N and another one with interleaved design with R Y B N R Y B /R Y B R Y B N to facilitate lower voltage drop and effective utilization of conductor materials for high continuous current applications.
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