What is sub station ? Write the gravity of the sub station. Write the names of different types of substation. Or mention different substation types.

 What is sub station ? Write the gravity of the sub station. Write the names of different types of substation. Or mention different substation types.

What are the considerations in choosing a lighting arrester? 1. Line voltage 2. frequency. 3. Reciprocity 4. It should be made in such a way that it does not suffer any damage to discharge the surge voltage. 5. It can earth the heavy voltage or surge very easily when needed but does not allow any power loss under normal conditions.

What are the devices used for protection in very high voltage system? 1. Earthing screen. 2. Overhead ground wire. 3. Lighting arresters or surge diverters. 4. Surge Observer.

What are the advantages and disadvantages of SF6 circuit breaker Answer: Advantages: 1. Arcing time is reduced due to improved arcing extinguishing power of SFg gas. 2. It is also useful for high current. 3. Operation time does not accumulate. 4. No carbon deposits. 5. Repair costs are low. Disadvantages : 1. SF% This breaker is expensive due to high cost of gas. 2. The reservoir has to store enough gas. 3. This circuit breaker requires additional equipment.

What is sub station called? What is its purpose? Answer: Definition: Sub station is an intermediate station between power generating station and consumer. Where electricity is received through multiple feeders with the help of various electrical appliances and converted into supply voltage of different quality with the help of Transformer. Or: In the electrical supply system, substations manage equipment that help in changing various characteristics such as voltage, AC to DC, frequency, power factor etc. Such a center is called a sub-station. 

Write the gravity of the sub station. 

Answer: 1. In transmission sub station or transformer substation, the medium voltage produced by the power house can be sent to high voltage over long distances. 2. Switching operations are completed on incoming and outgoing lines through switching sub stations. 3. Power factor can be improved through sub-stations. 4. Frequency change requires sub station. It is required to convert A.C to D.C or D.C to A.C. Sub station is required for installation of high voltage and low voltage switchgear circuit breaker, isoto, relay etc.

Write the names of different types of substation. Or mention different substation types. Answer: Substation is generally divided into 2 parts. 1. According to the service. 2. according to structure. 1. According to the service substation is further divided into different parts. a) Transfer substation: The substation where the supply voltage level can be changed is called transfer substation. b) Switching substation i c) Power factor correction substation. D) Frequency substation. E) Converting substation. f) Industrial substation. 2. According to the structure sub-stations can be divided into following. A) Indoor substation. b) Outdoor substation. C) Underground substation. d) Pole mounted substation.

Compare indoor and outdoor substations. Indoor substation. Outdoor substation. ME COACHING & GUIDE OPTIMUME COACHING & GU natal (b) This type of sub-station b) takes more space. | Installation takes less space. c) In this type of sub station c) In this type of sub station The fault is more because the area is more, that's why the fault is less is d) Fault detection and repair d) Fault detection and repair is difficult. easy to do E) In this type of substation e) Dust Sand or Moisture Dust - Effect of sand or moisture The impact is greater. read less f) Its extension and repair f) Its repair and expansion is affordable. simple g) Used at low voltage g) Used at high voltage. is Answer: 1. Basbar 3. Isolator 5.

List the various components of an indoor sub station or write the components of LT sub station or HT sub station? Power Transformer 9. Earthing switch - S.D.C supply 13. Air flow system. Isolator: 2. Lighting arrester 4. Well Circuit Breaker 6.P.T 8. Insulator 10. Fuse 12. Fire extinguishers and Disconnector + cut out isolators are used to isolate various equipments of substations, especially transformers in no-load or very light load conditions.

What is relay? Write the names of different types of reels. Answer: A relay is an automatic device which responds to any predetermined electrical condition change in an electrical circuit and helps to operate other devices connected in the circuit for protection.

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