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CHAPTER 3 MISCELLANEOUS 3.1 BATTERIES: -   In electrical power stations and large capacity substations, the operating and automatic control circuits, the protective relay systems, as well as emergency lightning circuits, are supplied by station batteries. The latter constitute independent source of operative dc power and guarantee operation of the above mentioned circuit irrespective of any fault which has occurred in the station or substation, even in the event of complete disappearance of the ac supply in the installation. Station batteries are assembled of a certain number of accumulator cells depending on the operating voltage of the respective dc circuits. Storage batteries are of two types namely lead acid and alkaline batteries are most commonly used in power stations and substations because of their higher cell voltage and low cost. Detailed description of the storage batteries is beyond the scope of the book and for it, A course in electrical technology volume 1of the same au...

2.1.1.SINGLE LINE DIAGRAM:     2.1.2.SEQUENCE OF EQUIPMENT:     2.2 OPERATION 2.2.1 LAYOUT OPERATION: In this substation the incoming sources are six. The incoming power is in “3-phase” from that the sequence of devices are to be connected. Firstly, lightning arrestors, these are used protect from the lightning strokes and diverting the surges. After this CVT’s are connected in order to measure the supply voltage. After this line isolators are connected for isolation of supply, they operate under no load conditions. After this current transformer is connected, it is installed for measuring current and protection purpose using protection relays. After this CB’s are connected these are used to isolate the faulty part of the power system in case of abnormal conditions. After this bus isolator are connected. After this a 220kv parallel bus is employed. This parallel bus is used for equal load sharing. After this, a step down transformer is connected to step down the voltage from 220kv to 1...

       Dialy lesson-Introduction to Substation chapter-1  1.1 INTRODUCTION Substations   serve as a sources   of energy supply for the local areas of distribution  in which these are located.  They   have   several   functions.  Of  them  the  main  functions  are  to receive energy  transmitted  at high  voltage  from the generating stations and to reduce  the  voltage  to a value appropriate  for  local   distribution. There are some substations  which  act  as  switching  stations   where  different  connections  between  various  transmission  lines  are  made, others  are   converting  substations  which  either  convert  ac  into  dc  or   vice versa or  convert  frequency  from  higher  level  to  lower  level or  vice versa . Substations   are   of  various  types  on  the  basis  of  nature  of  duties , service rendered ,operating  voltage , importance and  the  design.  Here  we  are  going  to  discuss  of  220/132/33kv  substation   which  we  find  normally  for  distrib...

TOPIC    -Inside an Electrical Substation                                                     CHAPTER 1: 1.1 INTRODUCTION 1.2. CLASSFICATION OF SUBSTATIONS 1.3. SELECTION AND LOCATION FOR SUBSTATION 1.4. INCOMING   SOURCES 1.5. OUTGOING SOURCES CHAPTER 2: 2.1.1 SINGLE LINE DIAGRAM OF 220/132/33KV SUBSTATION 2.1.2. SEQUENCE OF EQUIPMENT 2.2. OPERATION 2.2.1 LAYOUT OPERATION 2.3. EQUIPMENT IN A SUB – STATION 2.3.1. BUS BARS 2.3.2. INSULATORS 2.3.3. ISOLATOR SWITCH 2.3.4. CIRCUIT BREAKERS 2.3.4.1. SF6 CIRCUIT BREAKER 2.3.4.2. VACUUM CIRCUIT BREAKER 2.4. EARTHING SWITCH                                                                                           2.5 SEQUENCE OF OPENING & CLOSING OF CB 2.6. INSTRUMENT TRANSFORMERS 2.6.1. CURRENT TRANSFORMER 2.6.2. POTENTIAL TRANSFORMER 2.7. CURRENT VOTLAGE TRANSFORMERS 2.8. POWER TRANSFORMERS 2.9. CONDITION MONTERING OFTRANSFORMER OIL 2.9.1. ELECTRICAL PARAMETERS 2.10.RELAYS 2.10.1. BUCHHOLZ RELAY 2.10.2. ImpedAnce RELAY 2.10.3. DISTANCE PR...

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