The document summarizes the key components and functions of a 33/11kV substation in Indiranagar, Lucknow, Uttar Pradesh, India. It contains 10 sections that describe the introduction, transformer, isolator, circuit breaker, relay, lightning arrester, current/potential transformers, capacitor bank, and conclusion. The substation receives power from two 33kV transmission lines and steps it down through 3 parallel 10MVA transformers for distribution through 11 feeders to various areas in Indiranagar. It contains critical equipment like switchgear, isolators, circuit breakers, relays, and instrument transformers to safely transmit and distribute power. Capacitor banks are also included to improve the power

1. UTTAR PRADESH POWER CORPORATION LTD.
33/11 KV H.A.L SUBSTATION INDIRANAGAR
(LUCKNOW)
SUBMITTED TO-
SUBMITTED BY-
MR. Tazindera Singh Sogendra
Singh
(Assistant Professor) (1436020048)

2. CONTENT OF UPPCL
 Introduction
 Transformer
 Isolator
 Circuit Breaker
 Relay
 Lightning Arrester
 Current transformer and potential transformer
 Capacitor Bank
 Conclusion

3. INTRODUCTION
 The main bus of 33kv through CHINHAT LINE and GOMATINAGAR
LINES are connected to grid H.A.L INDIRANAGAR LKO.
 Now the transmission line first parallel connected with lightning arrestor
to diverge surge.
 A current transformer is connected in series with line which measure
current and step down current at ratio 800:1 for control panel.
 Switchgear equipment is provided, which is the combination of a C.B
having an isolator at each end.
 The main capacity of 30MVA for 33kv, which is subdivided into three
transformer capacity of (10MVA+10MVA+10MVA) parallel connected for
33kv.
 At both end of transformer lightning arrestor current transformer and
switchgear equipment provided.

4. SINGLE LINE DIAGRAM OF 33/11KV H.A.L
SUBSTATION (INDIRA NAGAR)

5.  The main bus is provided with switchgear equipment and current
transformer, This gives way to eleven feeders transmitting power to
INDIRANAGAR.
 This gives feeders transmitting power to {from incomer-1}
NILGIRI,BSNL,INDIRANAGAR.{ from incomer-2} SUBSTATION
COLONY,HAL COLONY,RAVINDRAPALLI,LESA. {from incomer-3}
SANJAYGANDHIPURAM,LEKHRAJ,LAXAMANPURI,BHOOTNAATH.

6. TRANSFORMER
 A transformer is a static device which transform power from one circuit
to another at same frequency.
 Since there is no rotating part so transformer is a static device.
 Transformer operates on ac supply.
 Transformer works on the principle of mutual induction.

7. ISOLATORS
 Isolator is a mechanical switch which isolates a part of circuit from
system for service or maintenance.
Difference b/w Isolator and circuit Breaker
 The major difference between an isolator and a circuit breaker is that an
isolator is an off-load device intended to be opened only after current has
been interrupted by some other control device.

8. CIRCUIT BREAKER
 Electrical circuit breaker is a switching device which can be operated
manually and automatically for controlling and protection of electrical
power system respectively.
 High-voltage breakers are nearly always solenoid-operated, with current
sensing protective relays operated through current transformers.
High-voltage breakers are broadly classified by the medium
used to extinguish the arc.
 Oil circuit breaker
 Air blast circuit breaker
 Vacuum circuit breaker
 SF6 circuit breaker

9. Sulfur hexafluoride (SF6) high-voltage circuit-breakers
A sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur
hexafluoride gas to quench the arc. They are most often used for
transmission-level voltages and may be incorporated into compact gas-
insulated switchgear.

10. RELAY
A relay is a compact and sensing device which sense the fault and isolate
faulty part from healthy part.
DISTANCE RELAY
 The most common form of protection on high voltage transmission
systems is distance relay protection.
 Power lines have set impedance per km.
 And using this value and comparing voltage and current the distance to a
fault can be determined.

12. LIGHTNING ARRESTER
 A lightning arrester is a device used on electrical power systems to
protect the insulation and conductors of the system from the damaging
effects of lightning.
 When a lightning surge travels along the power line to the arrester, the
current from the surge is diverted through the arrestor, in most cases to
earth.

13. CURRENT TRANSFORMER AND POTENTIAL
TRANSFORMER
 Current transformers, together with potential transformers (PT) are known
as instrument transformers.
 A current transformer produces a reduced current accurately proportional
to the current in the circuit, which can be conveniently connected to
measuring and recording instruments
 Potential Transformer or Voltage Transformer
are used in electrical power system for stepping
down the system voltage to
a safe value which can be fed to low ratings
meters and relays.
 Commercially available relays and meters
used for protection and metering,
are designed for low voltage.

14. CAPACITOR BANK
 The load on the power system is varying being high during
morning and low in evening which increases the load current.
This result in the decreased power factor.
 The low power factor is mainly due to the fact most of the power
loads are inductive and therefore take lagging currents.
 It is important to have power factor as close to unity as possible.
 In order to improve the power factor come device taking leading
power should be connected in parallel with the load. One of the
device can be capacitor bank.
 The capacitor draws a leading current and partly or completely
neutralize the lagging reactive component of load current.

15. CAPACITOR BANK PANEL

16. CONCLUSION
 We can conclude that electricity plays an important role in our life. We
are made aware of how the transmission of electricity is done. We too
came to know about the various parts of the Substation system.
 The Uttar Pradesh Cooperation Limited has got radio communication in
microwave range in order to transmit and receive data with various
Substations in Uttar Pradesh to get reliable transmission and distribution
of electricity.

18. CERTIFICATE