What is the difference between dry type transformer and oil immersed transformer?

Dry-type transformers use air as the cooling medium, while oil-filled transformers use oil instead of air.

 Some public places do not use oil-filled transformers because they are considered to be a big fire hazard and, instead, use dry-type transformers.

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What is the difference between a CT and a VT?

In a current transformer, the secondary winding has a large number of turns on the secondary side and is connected to the current winding of the instrument. In Voltage transformer, the secondary winding has a small number of turns on the secondary side and is connected to the instrument or meter.

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What is the difference between a single-phase transformer and a three-phase transformer?

The power supply in a single-phase transformer is through one conductor, while in three-phase transformers,

 the power supply is through three conductors. A single-phase transformer requires two wires to complete the circuit,

 while a three-phase transformer requires four wires to complete the circuit.

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What is the difference between a loop feed and a radial feed transformer?

In terms of transformers, radial feed transformers are designed to receive power from a single source and distribute it to multiple loads,

 while loop feed transformers are designed to receive power from multiple sources and distribute it to multiple loads.

What is the difference between radial and loop types of primary feeders?

Systems with higher voltage levels and multiple loads may prefer having radial feed to ensure efficiency, 

while systems with smaller capacity may opt for loop feed to reduce installation costs. 

In conclusion, both loop feed and radial feed have their own benefits and are used in different situations.

What is a looped feed?

A common distribution feed used to add reliability, especially in commercial and industrial areas,

 is called a loop feed. A loop feed serves customers off a loop that is connected to the primary feed at two ends.

 Electricity is directed in one direction through use of switches.

What is a radial feed?

The distribution feeder design dictates how distribution feeder lines are laid out and interconnected to provide service to customers,

 and there are several options. 

The simplest feed is the radial feed, which consists of a single line from the substation out to a number of customers.

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Why is VCB used?

Advantage of VCB

The vacuum circuit breakers can be reliable in cases of providing high insulating strength. 

Therefore, they carry better arc quenching features than other methods. Vacuum circuit breakers have a longer life, 

therefore, they can make a good investment, and can be reliable as well.

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What is the difference between Dyn11 and Dyn5?

A Dyn11 transformer, if abc terminals are connected to rst phases, will shift the output from "12 o clock" to "11 o clock" ie 30 degrees back. A Dyn5 if connected the same way will advance the output to "5 o clock" ie 150 degrees forward. The difference in output between the Dyn11 and Dny5 and is therefore 180 degrees.

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What's the difference between ONAN and ONAF?

Cooling Methods In Oil Immersed Transformers

ONAN - It is short for Oil Natural Air Natural and in this method, the heat that gets generated in the core and winding of the device is transferred to the oil. Then, the heated oil flows upwards and reaches the radiator. The place that is now vacant gets filled with the cooled oil from the radiator. The heat generated in the oil will then dissipate into the atmosphere because of the natural air flow around the transformer. 

ONAF – With the method of Oil Natural Air Forced, the heat dissipation can be improvised by applying forced air on the dissipating surface. This technique is used because forced air provides faster heat dissipation than the natural one. 

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What is the compact substation?A Compact Secondary Substation (CSS) is a type tested and arc tested assembly comprising an enclosure containing medium voltage (MV) switchgear, distribution transformers, low voltage (LV) switchboards, connections and auxiliary equipment to supply LV energy from MV systems.

What are the four types of substations?

Substation Types: Although, there are generally four types of substations there are substations that are a combination of two or more types.

• Step-up Transmission Substation.

• Step-down Transmission Substation.

• Distribution Substation.

• Underground Distribution Substation.

• Substation Functions.

• Substation Equipment.

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