Month: January 2015

Non Segregated Phase Bus: Knowing Its Operation

The non segregated bus duct is fabricated by using top of the line constituents to assure a firm and dependable powers transmit. Bus ducts can be used in range of applications, that is, from switchgear assemblies to unit substations.  Enclosure comes in wide range of choices: NEMA 4X, Stainless Steel, aluminum and NEMA 3R.

Baked on Epoxy, the powder coat offers mechanical durability, scratch resistance and meeting the salt spray needs of ASTM B-117. Detachable enclosure covers are firmly fixed bolt, thereby letting easy access.

Non Segregated Phase Bus joints are protected by bolting the bars by using splice plates on both the sides, thereby offering a solid association. Bus bar is complete conductivity with pure copper. Plastic joints every 50 feet in straight bus runs let bus extension while transferring the rated current.

Fluidized bed epoxy insulation is non-hygroscopic in nature and utmost static. It also defies fungus, mold and tracking. Epoxy resin, dissimilar to other insulations, consistently coats bus configuration. Thermal and electrical performance is improved as the epoxy is straightly tied to the bus conductor, removing the air gap found in other buses. It improves heat transfer and avoids corona discharge and insulation damage.

Bus joints are shielded with flame retardant element that is detachable for joint inspections.

Termination Choices:

  • Potheads
  • Flexible shunts
  • Conductive stub ends
  • Bushings
  • Fire stops
  • Space leads

As per ANSI standards, corona extinction levels are not precise; however they are considered apt for the production type test. Transitory ratings are not specified in the usual; however the duct is predictable to be apt and go with the transitory rating of the equipment to which it is connected. The segregated DC bus duct supposed voltage rating varies from 300 to 3200 volt DC with constant ratings up to 6000A.

Segregated Phase Bus Duct: Ratings Required For It

segregated phase bus

Isolated phase duct is moderately special as compared to the other duct systems termed and needs much more space. It is also considerably more costly to buy and install, but considered a unique system for particular applications and, in specific, as a generator duct feed. Generally, rigid conductor type Segregated Phase Bus Duct length is computed from centre line to centre line, and the tools to which it is attached, to form overall duct-length footage. Bar extensions within a termination cubicle are regarded as part of the termination tool. For cable duct, the same measures are used for establishing the length.

The only exemption is 60 inches of duct length should be added for creating overall length dimensions, because of the cable extension leads vital at every end. Such cable lead extensions are measured part of the duct length, somewhat than part of the termination equipment.


Segregated duct that comprises of cable duct basically has the same constant current ratings, from 600A to 6000A. Duct of higher ratings is delivered up to 12000A; nevertheless this is for special applications needing special design, fabricating and installation considerations. Capacities are usually based on 40°C ambient where conductors have silver plated joints, and the permissible temperature rise of the conductor is 65°C. Noncurrent carrying parts that can be voluntarily touched are allowed a 40°C rise. Ambient temperature range limits are -30°C to +40°C, and height is up to 1000 metres (3300 feet). Other ambient situations require special consideration and may perhaps contribute to de-rating.

Voltage range for these kinds of duct is chiefly from above 600V to 34.5kV to ANSI but to 46kV to CSA. In everyday terminologies, the maximum rating is 38kV with a BIL rating of 150kV. It comprises of cable duct, even though cable at supposedly 38kV can have a higher BIL rating and can undoubtedly have higher insulating voltage class, up to 33 per cent insulation on higher voltage ratings.

Distribution Substation: Transmitting Power


All the electrical proceedings, electrical wires tend to pass through a component or unit which makes it feasible and practical to go to other units, easily. It is these electrical components that make work easy for the electricity house to easily distribute electricity to every house or single unit. It is the job and task of the electrical components that they effectively make use of the distribution station. The function of these distribution substations is major. The actual and prime usage of these units is to transfer power from the transmission system to the specific area’s distribution system. Hence, the task of Distribution substation could not be easily neglected.

They being the major and important units of the electrical system, they are given the highest authority to perform every single task, efficiently. It is quite extravagant or waste to straight away connect electricity users to the main transmission network, until and unless they make use of large amounts of power. It is because of this reason; the distribution station lessens the voltage to the most appropriate level for the local distribution.

The key functionality behind the use of these substations is not clearly understood. Hence, the function and service rendered by these units should be verified and tested by the electrical houses. The more intricate the functionality, the more complex would be the electrical wire mess. The function being obscure and complex, it is necessary that the personnel engaged in handling these substation is a proficient and competent one. Experts and only skilled professionals should be surcharged of handling the substations. If they are not that experienced, the service rendered by them would not be of that standard and competence. So, if you are factory owner going through this post, ensure that only experienced and skilled personnel are being employed in your unit.