Internship Report at 132kv Grid station

1. Internship Report of P & I
FAST
National University of Computer and Emerging Sciences
Submitted By: Osama Zahid.
Letter No. 33318-20
Degree: Electrical Engineering (Power Engineering)
CGPA: 3.30
Letter No. 33318-20
CNIC: 384037-693341-9
Contact: 03126309876

2. CONTENTS
1. ……………………………………………………………………………………………………………….
SUMMARY
2. ……………………………………………………………………………………………………………….
RESUME
3. ……………………………………………………………………………………………………………….
TRANSCRIPT
4. ……………………………………………………………………………………………………………….
MESSAGE RECEIVER
5. ……………………………………………………………………………………………………………….
PTW (PERMISSION TO WORK)
6. ……………………………………………………………………………………………………………….
BATTERY CHART
7. ……………………………………………………………………………………………………………….
ELECTRICAL FUNCTION
8. ……………………………………………………………………………………………………………….
MAINTENANCE SCHEDUL
9. ……………………………………………………………………………………………………………….
PERCENTAGE LOSS OF 11KV
10. ……………………………………………………………………………………………………………….
GRID AND THE SUB STATION
11.……………………………………………………………………………………………………………….
FUNCTIONS OF A GRID STATION
12. ……………………………………………………………………………………………………………….
ADVANTAGES OF THE GRID SYSTEM
13. ……………………………………………………………………………………………………………….
DISADVANTAGES OF THE GRID SYSTEM
14. ……………………………………………………………………………………………………………….
QUIPMENT USED IN A SUB-STATION

3. SUMMARY
Power is distributed from the Generation toward the consumer end, as the generation unit are
located outside of the city so to transport electricity we need transmission system, all sub grid station,
main grid station and Generation units are connected each other in ring structure to form national
power ring structured circuit, In Pakistan there are three types of Voltage transmission lines
1. 500kV transmission lines
2. 220kV transmission lines
3. 132kV transmission lines
In my internship in F16 sub-Grid station we are taking Power of 132kv from Sanggani, remember that
Sanggani is 500kv grid station mean that it takes 500kv input and distribute 220kv, 132kv and 500kv
through different transformer among different substations connected in ring structure and F16 grid
station is the one of them which taking 132kv from Sanganni, as F16 is 132kv grid station.
Sub Grid station
Power coming from the main substation as of HIGH Voltage 132kV, 500kV and 220kV in Pakistan, that
voltage should be step down for the distribution of the power in the cities, so to change the power
characteristic Sub Grid station are allocated for ever particular location.
INLET TO THE GRID STATION.
132kv Voltage is coming from the Sanggani, as Ring type distribution structure is fallow in Pakistan, on
the basis of this F16 in connected in the ring structure with the inlet is SANGGANI and Outlet I-16.
An electrical grid station is an interconnection point between two transmission ring circuits, often
between two geographic regions. They might have a transformer, depending on the possibly different
voltages; so that the voltage levels can be adjusted as needed .Grid station regulates and controls the
power between inter connected transmission lines to increase the reliability of the power system. It
receive power from the power station at extremely high voltage and then convert these voltage to
some low levels and supplied electric power to the sub stations or to other grid stations at the same

4. voltage level according to the requirements. National grid system of Pakistan contains an
interconnected group of transmission lines in a ring system. It covers most of the power stations of the
country in this single ring and supplied electric power to the different areas of the country. Main
function of the grid station is switching between the connected line stations and the load centers. The
electric power is produce at the power station, which are located at favorable places, generally quite
away from the consumers. It is delivered to the consumer through a large network of transmission and
distribution. At many place in the line of power system, it may be desirable and necessary to change
some characteristic (e.g. Voltage, ac to dc, frequency, p.f. etc.) of electric supply. This is accomplished
by suitable apparatus called sub-station for example, generation voltage(11kv or 6.6kv) at the power
station is stepped up to high voltage (Say 220kv to 132kv) for transmission of electric power. Similarly
near the Consumer’s localities, the voltage may have to be stepped down to utilization level. This job is
again accomplished by suitable apparatus called sub-station.

5. Derivation of √3
We assume that a 3 phase voltage source can be represented by an
equilateral triangle of side 2cm each and angle of 60 degrees.
We then take a perpendicular bisector
between two lines and find the length of
the bisector. The bisector represents our single phase voltage.
By applying Pythagoras theorem, and calculating on one right angle
triangle formed, we see that:
Hypotenuse^2=Perpendicular^2+Base^2
We know that the hypotenuse is 2cm while the base is 1cm.Hence
the length of the bisector comes to be √3.
Thus we conclude that the voltage of a 3 phase source is
the factor of √3 times that of equivalent single phase voltage.

6. PTW (PERMIT TO WORK)
ISLAMABAD ELECTRIC SUPPLY COMPANY LTD
PERMIT TO WORK
Issue to Mr. LS Sub Division
On 11kv O/G for
It is safe to work on following apparatus which is dead, isolated from all isolated live conductors and is
earthed. All other parts are dangerous.
Here state exactly the apparatus on which it is safe to work.
Here state exactly at what point or points the apparatus is connected to earth.
Time Hrs. Date. Sign. Shift Engineer
FORM OF RECIEPT
NOTE: The form after signed for worked proposed must be retained by the authorized person. In charge of the
work until the work is completed or suspended.
Signed by Designation

7. Being the authorized person in charge of the work for which the apparatus mentioned person has been made
dead and to whom all the keys of the locked in the earthing switches and locked out isolating switches and
circuit breakers controlling the circuit have been duly handed over.
Time Hrs. Dated.
CLEARANCE CERTIFICATE
NOTE: This apparatus mentioned here must not be again made live until this Form has been signed and
returned by authorized person in charge of work. In cases where more than one gang of men are working on
the same apparatus it must not be again made live until similar Form have been signed returned by all
authorized persons in charge of work.
I hereby declare that all the men under my charge have been made withdrawn and warned that it is no longer
on the apparatus specified on this Form and that tools temporary earthed and other connections are all clear
leaving that portion of the apparatus upon which May men have been working ready for putting info
connections.
Signed by Designation
Authorized person LS in charge of the works All switchgear keys returned.
Time Hrs. Dated.
CLEARANCE
I hereby declares the Form cancelled. All switchgear keys received back.
Signed by shift Engineer Time Hrs. Dated.

8. BATTERY GRAVITY
ELECTRICAL FUNCTION NUMBER
 1 - Master Element
 2 - Time-delay Starting or Closing Relay
 3 - Checking or Interlocking Relay
 4 - Master Contactor
 5 - Stopping Device
 6 - Starting Circuit Breaker
 7 - Rate of Change Relay
 8 - Control Power Disconnecting Device
 9 - Reversing Device
 10 - Unit Sequence Switch
 11 - Multifunction Device

9.  12 – Over speed Device
 13 - Synchronous-Speed Device
 14 – Under speed Device
 15 - Speed or Frequency Matching Device
 16 - Data Communications Device
 17 - Shunting or Discharge Switch
 18 - Accelerating or Decelerating Device
 19 - Starting-to-Running Transition Contactor
 20 - Electrically-Operated Valve
 21 - Distance Relay
 21G - Ground Distance
 21P - Phase Distance
 22 – Equalizer circuit breaker
 23 – Temperature control device
 24 – Volts per hertz relay
 25 – Synchronizing or synchronism-check device
 26 – Apparatus thermal device
 27 – Under voltage relay
 27P - Phase Under voltage
 27S - DC under voltage relay
 27TN - Third Harmonic Neutral Under voltage
 27TN/59N - 100% Stator Earth Fault
 27X - Auxiliary Under voltage
 27 AUX – Under voltage Auxiliary Input
 27/27X - Bus/Line Under voltage
 27/50 - Accidental Generator Energization
 28 - Flame Detector
 29 - Isolating Contactor
 30 - Annunciator Relay
 31 - Separate Excitation Device
 32 - Directional Power Relay
 32L - Low Forward Power
 32N – Wattmetric Zero-Sequence Directional
 32P - Directional Power
 32R - Reverse Power
 33 - Position Switch
 34 - Master Sequence Device
 35 - Brush-Operating or Slip-ring Short Circuiting Device
 36 - Polarity or Polarizing Voltage Device
 37 - Undercurrent or Under power Relay
 37P – Under power
 38 - Bearing Protective Device / Bearing Rtd
 39 - Mechanical Condition Monitor
 40 - Field Relay / Loss of Excitation
 41 - Field Circuit Breaker

10.  42 - Running Circuit Breaker
 43 - Manual Transfer or Selector Device
 44 - Unit Sequence Starting Relay
 45 - Atmospheric Condition Monitor
 46 - Reverse-Phase or Phase Balance Current Relay or Stator Current Unbalance
 47 - Phase-Sequence or Phase Balance Voltage Relay
 48 - Incomplete Sequence Relay / Blocked Rotor
 49 - Machine or Transformer Thermal Relay / Thermal Overload
 49RTD - RTD Biased Thermal Overload
 50 - Instantaneous Over current Relay
 50BF - Breaker Failure
 50DD - Current Disturbance Detector
 50EF - End Fault Protection
 50G - Ground Instantaneous Over current
 50IG - Isolated Ground Instantaneous Over current
 50LR - Acceleration Time
 50N - Neutral Instantaneous Overcurrent
 50NBF - Neutral Instantaneous Breaker Failure
 50P - Phase Instantaneous Overcurrent
 50SG - Sensitive Ground Instantaneous Overcurrent
 50SP - Split Phase Instantaneous Current
 50Q - Negative Sequence Instantaneous Overcurrent
 50/27 - Accidental Energization
 50/51 - Instantaneous / Time-delay Overcurrent relay
 50Ns/51Ns - Sensitive earth-fault protection
 50/74 - Ct Trouble
 50/87 - Instantaneous Differential
 51 - AC Time Overcurrent Relay
 51 - Overload
 51G - Ground Time Overcurrent
 51LR - AC inverse time overcurrent (locked rotor) protection relay
 51N - Neutral Time Overcurrent
 51P - Phase Time Overcurrent
 51R - Locked / Stalled Rotor
 51V - Voltage Restrained Time Overcurrent
 51Q - Negative Sequence Time Overcurrent
 52 – AC circuit breaker
 52a - AC circuit breaker position (contact open when circuit breaker open)
 52b - AC circuit breaker position (contact closed when circuit breaker open)
 53 - Exciter or Dc Generator Relay
 54 - Turning Gear Engaging Device
 55 - Power Factor Relay
 56 - Field Application Relay
 57 - Short-Circuiting or Grounding Device
 58 - Rectification Failure Relay

11.  59 - Overvoltage Relay
 59B - Bank Phase Overvoltage
 59P - Phase Overvoltage
 59N - Neutral Overvoltage
 59NU - Neutral Voltage Unbalance
 59P - Phase Overvoltage
 59X - Auxiliary Overvoltage
 59Q - Negative Sequence Overvoltage
 60 - Voltage or Current Balance Relay
 60N - Neutral Current Unbalance
 60P - Phase Current Unbalance
 61 - Density Switch or Sensor
 62 - Time-Delay Stopping or Opening Relay
 63 - Pressure Switch Detector
 64 - Ground Protective Relay
 64F - Field Ground Protection
 64R – Rotor earth fault
 64REF – Restricted earth fault differential
 64S – Stator earth fault
 64S - Sub-harmonic Stator Ground Protection
 64TN - 100% Stator Ground
 65 - Governor
 66 - Notching or Jogging Device/Maximum Starting Rate/Starts Per Hour/Time Between Starts
 67 - AC Directional Overcurrent Relay
 67G - Ground Directional Overcurrent
 67N - Neutral Directional Overcurrent
 67Ns – Earth fault directional
 67P - Phase Directional Overcurrent
 67SG - Sensitive Ground Directional Overcurrent
 67Q - Negative Sequence Directional Overcurrent
 68 - Blocking Relay / Power Swing Blocking
 69 - Permissive Control Device
 70 – Rheostat
 71 - Liquid Switch
 72 - DC Circuit Breaker
 73 - Load-Resistor Contactor
 74 - Alarm Relay
 75 - Position Changing Mechanism
 76 - DC Overcurrent Relay
 77 - Telemetering Device
 78 - Phase Angle Measuring or Out-of-Step Protective Relay
 78V - Loss of Mains
 79 - AC Reclosing Relay / Auto Reclose
 80 - Liquid or Gas Flow Relay
 81 - Frequency Relay

12.  81O - Over Frequency
 81R - Rate-of-Change Frequency
 81U - Under Frequency
 82 - DC Reclosing Relay
 83 - Automatic Selective Control or Transfer Relay
 84 - Operating Mechanism
 85 - Pilot Communications, Carrier or Pilot-Wire Relay
 86 - Lock-Out Relay, Master Trip Relay
 87 - Differential Protective Relay
 87B - Bus Differential
 87G - Generator Differential
 87GT - Generator/Transformer Differential
 87L - Segregated Line Current Differential
 87LG - Ground Line Current Differential
 87M - Motor Differential
 87O - Overall Differential
 87PC - Phase Comparison
 87RGF - Restricted Ground Fault
 87S - Stator Differential
 87S - Percent Differential
 87T - Transformer Differential
 87V - Voltage Differential
 88 - Auxiliary Motor or Motor Generator
 89 - Line Switch
 90 - Regulating Device
 91 - Voltage Directional Relay
 92 - Voltage And Power Directional Relay
 93 - Field-Changing Contactor
 94 - Tripping or Trip-Free Relay
 95 – For specific applications where other numbers are not suitable
 96 – For specific applications where other numbers are not suitable
 97 – For specific applications where other numbers are not suitable
 98 – For specific applications where other numbers are not suitable
 99 – For specific applications where other numbers are not suitable

13. PERCENTAGE LOSSES OF 11KV INCOMING
INCOMING NUMBER 01 (T1):
DEC 2018
SR.NO MWH MVARH Rawal
22 446224.93 193262.32 85368308
23 446413.17 193262.38 85399217
MAXIMUM AND MINIMUM LOAD:
SR.NO GHORI
GARDEN
KHANNA AZAD
SHAHEED
%age losses
U/RECEIVED
%age losses
U/S.OUT
22 50087179 14760109 39786774 170880 186093
23 50132049 14806328 39814418 188240 189489
INCOMING NUMBER 02 (T2):
SR.NO DIFFERENCE %age
losses
U/RECIVED U/S.OUT DIFFERENCE LOSSES
22 -15413 -9.01 281000 267203 -13797 4.90%
23 -1249 -0.661 262000 263037 -1037 0.39%
MAXIMUM AND MINIMUM LOAD (TOTAL LOSSES OF GSS):
DEC 2018
SR.NO U/RECIVED U/S.OUT DIFFERENCE %age losses SIGN. NOTED
TO.
22 451880 453496 -1616 -0.35% NADEEM NOMAN
23 450240 452526 -2286 -0.50%

14. NAME PLATES
11KV INCOMING PANEL
CLIENT NAME IESCO ISD
IESCO P.O.NO. PMUISTGIGS-0111040-45 DATED: 07/3/11
PANEL SERIAL NO. INCOMING 104120111 IESCO
REFERANCE STANDARD IEC 2981 WAPDA P-44-96
IMPULSE WITHSTAND VOLTAGE 95 KV
POWER FREQUENCY WITHSTAND
VOLTAGE
36 KV
RATED VOLTAGE 12 KV
CIRCUIT BREAKER RATING 200 A 25 KA
RATE CURRENT OF BASE BARS 2500 A
BREAKING CAPACITY 25 KA
C.T (METRING AND PROTECTION) 2400:1200 1515A
C.T (DIFFERENTIAL) 2400:1200 15A
P.T 11000/√3 V:110/√3 V
RATED FREQUENCY 50 HZ
C.B TRIP COIL 110 V DC
C.B CLOSING COIL 110 V DC
C.B MOTOR DRIVES 220 V AC
WEIGHT TROLLEY 250 Kg
TOTAL WEIGHT 1225 Kg
11KV OUT GOING PANEL
TYPE WPV-25-B
STANDARD WAPDA P-44-96.IEC.298
FREQUENCY 50 HZ
RATED VOLTAGE 12 KV
CIRCUIT BREAKER RATING 630A/25KA (1-SEC)
RATE CURRENT OF BUS BARS 2500 A
BREAKING CAPACITY 25 KA
C.T (METRING AND PROTECTION) 400:200 1515A
C.T (DIFFERENTIAL) -----
RATED FREQUENCY 50 HZ
C.B TRIP COIL 110 V DC
C.B CLOSING COIL 110 V DC
WIRING DIAG D395 5273
CONTRACT NO. ADB-IESCO/PMU.01.2009 DATED: 16/12/09
SYSTEM VOLTAGE 11 KV
INSULATION LEVEL 36/95KV
11KV BUS COUPLER
TYPE RK(BUS COUPLER)
STANDARD IEC 298 & WAPDA P44:96
FREQUENCY 50 HZ

15. RATED VOLTAGE 12000 KV
LIGHTINING IMPULSE VOLTAGE 95 KV
CIRCUIT BREAKER RATING 630A/25KA (1-SEC)
NORMAL VOLTAGE 11000 V
RATE CURRENT OF BUS BARS 2500 A
BREAKING CAPACITY 25 KA
C.B CURRENT (CONTINUES) 2500 A
C.B CURRENT (SHORT TIME) 25 KA 1SEC
RATED FREQUENCY 50 HZ
C.B TRIP COIL 110 V DC
LOAD BREAK SWITCH 400 A
I-MAKING CURRENT 63 KA
B-SHORT TIME CURRENT 25 KA 1SEC
WIRING DIAG (3) A1688 529
CONTRACT NO. ADB-IESCO/PMU.01.2009 DATED: 16/12/09
TROLLEY WEIGHT 300 Kg
TOTAL WEIGHT 2100 Kg
OPERATING INSTRUCTIONS PKC 2982
IESCO PURCHASE NO. 1ST YEAR (6TH SIG)
POWER TRANSFORMER
PEL
TYPE TMAO 40/145
STANDARDS APPLIED P-46:2008 , IEC60076
CUSTOMER REFRENCE NO IESCO
SERIAL NO PEL HV 1160053
YEAR OF MANUFACTURE 2016
NUMBER OF PHASE 3
NUMBER OF WINDINGS 2
FREQUENCY 50 Hz
INSULATION CLASS A
TOP OIL TEMPERATURE RISE 50 •C
WINDING TEMPERATURE RISE 55 •C
OIL SPECIFICATIONS IEC 60296
QUANTITY OF OIL 21300 L
OIL WEIGHT 19000 Kg
WEIGHT OF CASE AND FITTING 16500 Kg
WEIGHT OF CORE AND COIL 33500 Kg
TOTAL WEIGHT 72000 Kg
TRANSPORT WEIGHT 62000 Kg
UNTAKING WEIGHT 37000 Kg
WEIGHT OF HEAVIEST PART 62000 Kg
AUXILIARY POWER OF FANS 3.0 kW
CT1 & CT3 CT2
FUNCTION THERMAL IMAGE FOR AVR
TERMINALS S1-S2 S1-S2

16. RATIO 300/2 A 300/5 A
BURDEN 10 VA 10 VA
ACC. CLASS CLASS 3 CLASS 3
NO.OF CTs/CORES 2× (1×1) 1 / 1
RESISTANCE OF SECONDARY WINDING 800mΩ 800mΩ 500 MΩ
METHOD OF COOLING 0NAN/ONAF
RATED HIGH VOLTAGES 132 KV
RATED LOW VOLTAGES 11.5 KV
H.V CURRENT 137.8/175 A
L.V CURRENT 1581.4/2008.2 A
RATED POWER 31.5/40 MVA
POWER AT 55•C WINDING TEMPERATURE
RISE
31.5/40 MVA
POWER AT 60•C WINDING TEMPERATURE
RISE
34/42 MVA
POWER AT 65•C WINDING TEMPERATURE
RISE
35.5/44 MVA
TAP CHANGER POSITION 1 12 23
SHORT CIRCUIT IMPEDANCE REFER TO
H.V Ohms
212.3 166 132.9
IMPEDANCE VOLTAGE AT 31.5/40 MVA
%
10.25/13.02 9.70/12.32 9.57/12.5
COPPER LOSS AT 75•C , 31.5/40 MVA kW 84.65/136.50 83.90/135.29 100.53/162.11
IRON LOSS AT 75•C ,100% VOLTAGE
kW
15.4676
MAX.EXCITING CURRENT ON 31.5 MVA
BASE
0.37 %
TYPE OF ON LOAD TAP CHANGER VV III 250-D-145-12 23 1W of MR GERMANY
TAPPING RANGE 132 KV ± 11×0.909 %
HIEGHEST OPERATING VOLTAGE FOR
WHICH TAPPING ARE DESIGNED
110 %
IMPULSE TEST VOLTAGE H.V WINDING 650 KV peak
IMPULSE TEST VOLTAGE L.V WINDING 110 KV peak
SEPARATE SOURCE POWER FREQUENCY
TEST VOLTAGE H.V WINDING
275 KV rms
SEPARATE SOURCE POWER FREQUENCY
TEST VOLTAGE L.V WINDING
38 KV rms
DURATION OF SHORT CIRCUIT 3 Sec
H.V WINDING UNIFORMLY INSULATED YES
TANK AND CONSERVATOR DESIGNED
FOR FULL VACUUM FILLING
YES
MANUFACTURED BY PEL UNDER LICENSE FROM GANZ
TRANSELEKTRO RT,
MADE IN PAKISTAN
132 KV LINE CIRCUIT BREAKER
SF6 CIRCUIT BREAKER
145 KV

17. RATED VOLTAGE
STANDARD NO IEC62271-100:2001
LIGHTENING IMPULSE WITH STAND VOLTAGE 650KV
RATED FREQUENCY 50 HZ
RATED CURRENT 3150 A
RATED DURATION OF SHORT CIRCUIT 3 S
RATED SHORT CIRCUIT BREAKING CURRENT 40 KA
FIRST POLE TO CLEAR FACTOR 1.5
RATED LINE CHARGING BREAKING CURRENT 50 A
RATED OPERATING SEQUENCE 0-0.3S-CO-180S-CO
RATED SF6 GAS PRESSURE (AT 20’C,1013 HPA 0.64 MPA
CONTACT RESISTANCE 48microΏ
RATED SUPPLY VOLTAGE OF CLOSING AND OPENING DEVICES 110 V DC
RATED SUPPLY VOLTAGE OF AUX. CIRCUITS 110 V DC
RATED SUPPLY VOLTAGE OF MOTOR 110 V DC
TEMPERATURE CLASS -30……+50’C
MASS OF SF6 GAS 10 KG
MASS OF THE CIRCUIT BREAKER 1290 KG
YEAR OF MANUFACTURE 2011
CLASSIFICATION M2
SERIAL NUMBER 11 312 1650 08
ALSTOM SUZHOU HIGH VOLTAGE SWITCHGEAR CO., LTD
132 KV TRANSFORMER CIRCUIT BREAKER
SF6 CIRCUIT BREAKER
RATED VOLTAGE
145 KV
STANDARD NO IEC62271-100:2001
LIGHTENING IMPULSE WITHSTAND VOLTAGE 650KV
RATED FREQUENCY 50 HZ
RATED NORMAL CURRENT 2000 A

18. RATED DURATION OF SHORT CIRCUIT 3 S
RATED SHORT CIRCUIT BREAKING CURRENT 40 KA
FIRST POLE TO CLEAR FACTOR 1.5
RATED LINE CHARGING BREAKING CURRENT 50 A
RATED OPERATING SEQUENCE 0-0.3S-CO-180S-CO
RATED SF6 GAS PRESSURE (AT 20’C,1013 HPA) 0.64 MPa
CONTACT RESISTANCE 48microΏ
RATED SUPPLY VOLTAGE OF CLOSING AND OPENING DEVICES 110 V DC
RATED SUPPLY VOLTAGE OF AUX. CIRCUITS 110 V DC
RATED SUPPLY VOLTAGE OF MOTOR 110 V DC
TEMPERATURE CLASS -30……+50’C
MASS OF SF6 GAS 10 KG
MASS OF THE CIRCUIT BREAKER 1290 KG
YEAR OF MANUFACTURE 2012
CLASSIFICATION M2
SERIAL NUMBER 12 312 0010 04
132 KV LINE CT
CURRENT TRANSFORMER
TYPE LCW-145TAW2
STANDARD CODE IEC60044-1:2003
INSUL.LEVEL 145/275/650 KV
SHORT-TIME Therm/dyn
CURRENT 20/50 kA
CREEP. DISTANCE 385cm
FREQUANCY 50Hz
P1-P2
1S1-1S2 1S1-1S3 2S1-2S2 2S1-2S3 3S1-3S2
4S1-4S2
3S1-3S3
4S1-4S3
300 300/5 ---- 300/5 ---- 300/5 ---- A
600 600/5 600/5 600/5 600/5 600/5 600/5 A
1200 ---- 1200/5 ---- 1200/5 ---- 1200/5 A
Rated
Output 15 15 60 60 30 30 VA
Class
0.5 FS10 0.5 FS10 10P20 10P20 10P20 10P20
WEIGHT.OF OIL 150Kg

19. TOTAL WEIGHT 710Kg
Date of Manufacture 2010. 7
IESCO CONTRACT NO. ADB-IESCO/PMU-09/2010
DATED 10/05/2010
SERIAL NO. 1010079-12
132 KV Transformer CT
CURRENT TRANSFORMER
TYPE LVB-145 W3
STANDARD CODE IEC60044-1:2003
RATED INSUL.LEVEL 145/275/650 KV
I th / I dyn 40/100 kA
OIL 86 Kg
TOTAL 400 Kg
ALTITUDE 1000 m
FREQUANCY 50 HZ
Secondary
Terminal marks
Rated current, A
1S1-1S2 2×100/5
2S1-2S2 2×100/5
3S1-3S2 2×100/5
Accuracy
class
FS/ALF Rated output
,VA
0.5 10 15
10P 20 60
10P 20 30
PARALLEL CONNECTION 200 A
SERIES CONNECTION 100 A
CREEPAGE DISTANCE 4495 mm
DATE OF MUNUFACTURE 2015-12
SPEC P-90:2012
NAME OF PURCHASER IESCO
JIANGSU SIEYUAN HERTZ INSTRUMENT TRANSFORMER CO. LTD CHINA
PT (POTENTIANL TRANSFORMER)
TYPE JDS6-145TAW2
STANDARD CODE IEC60044-2: 1997
INSUL.LEVEL 145/275/650 Kv
RATED VOLTAGE FACTOR 1.5
FREQUANCY 50 Hz
CREEP. DISTANCE 3856mm
RATED TIME 30s
A-N 1a-1n
13200/√3 110/√3 V
RATED OUTPUT 50 VA
CLASS 0.2
THERMAL LIMITING OUTPUT 2000VA
WEIGHT OF OIL 160Kg
TOTAL WEIGHT 720Kg
DATE OF MANUFACTURE 2009.8
SERIAL NO. 0820089-3
PROJECT NAME: 132 Kv AIS GRID STATION AT 1-16 SECTOR, ISLAMAB

20. AUXILIARY TRANSFORMER
TYPE TTO 200/11
STD. OF TRANSFORMER DDS-71:04
RATED POWER 200 KVA
RATED FREQUANCY 50 Hz
TYPE OF COOLING ONAN
TOTAL WEIGHT 1058 KG
LIFTABLE WEIGHT 465 KG
OIL WEIGHT 225 KG
CORE WEIGHT 285 KG
VECTOR GROUP Dy 11 L.V.
SIZE OF WINDING H.V 1.4
WEIGHT OF WINDING 71 KG
RATED VOLTAGE 11500 V
IMPULSE WITHSTAND 95 KV
RATED CURRENT 10.04 A
PHASES 3
IMPEDANCE VOLTAGE %
YEAR OF MANUFACTURE 2010
P.O WB-IESCO/NCB 02/PMU-19/2010
SR. NO, 140274
SHUNT CAPACITOR NAME PLATE
TYPE BAM9 12/√3-200-1W
WEIGHT 41 KG
RATED FREQUENCY 50 Hz
RATED VOLTAGE 12/√3 KV
RATED OUTPUT 200 Kvar
RESIDUAL VOLTAGE 50 V
FLUID NAME M/DBT(NON PCB)
RATED CURRENT 28.87 A
MEASURED CAPACITANCE 13.18 MICRO F
TEMPERATURE -10 to 55 ‘C
50
5.2×7.3
415
278.2
3
4

21. DISCHARGE RESISTOR 1.0 MΏ
DISCHARGE TIME 5 MIN
1 MIN.AC WITHSTAND VOLTAGE 42 KV
LIGHTENING IMPULSE VOLTAGE 95 KV
IESCO P.O NO 2132
DATED 11-10-2011
SERIAL 220031
NTDC SPECIFICATION NO P- 78
RATED POWER FREQUANCY VOLTAGE 14.9
CAPACTOR O/G PANEL
TYPE RK (CAPACTOR O/G)
PANEL SERIAL NUMBER 12 05 237
REFERANCE STANDARD IEC 298
NTDC/WAPDA P44:96
LIGHTENING IMPULSE VOLTAGE 95 KV
POWER FREQUENCY VOLTAGE 36KV (60 Sec)
RATED VOLTAGE 12000 V
NOMINAL VOLTAGE 11000 V
RATED CURRENT OF BUS BARS 2500 A
RATED FREQUENCY 50 Hz
CB CURRENT (CONTINUOUS) 630 A
CB CURRENT (SHORT TIME) 31.5KA (3Sec)
CB BREAKING CAPACITY 31.5KA
C.B TRIP COIL(SHUNT) 110 V DC
C.T RATIO
PROTECTION CORE 400-200/5A
METERING CORE
TROLLEY WEIGHT
TOTAL WEIGHT
OPERATING INSTRUCATIONS
IESCO CONTRACT NO.

22. COMMISSIONING OF 132KV TRANSFORMER Differential Balancing:
Make ABB RET 615 Applied 3phase current on primary side
IL1=3.9 A I Diff1=0.02
IL2=4.0 A I Diff2=0.02
IL3=4.0 A I Diff3=0.02
IL1B=30.4 A I bias1=0.02
IL2B=30.9 A I bias2=0.02
IL3B=30.4 A I bias3=0.02
Relay testing with secondary injection
ABB RET 615 Pickup Trip
Ph-Ph HV 0.84 0.86
Ph-Ph LV 1.21 1.24
Ph-E 1.22 1.24
ABB RET 615 Setting Pickup Trip
Ph-Ph 4.4A 5.86A 5.96A
Ph-E 1A 1.2A 1.30A
PROTECTION TEST
1. Main buccholz alarm trip inter-trip test performed OK.
2. Tape changer buccholz trip inter-trip test performed OK.
3. Pressure relief value trip inter-trip test performed OK.
4. Oil temperature fan start 50c alarmed 80c trip inter-trip test performed OK.
5. Low oil harmed induction tested OK.
6. Fan operation local remote test performed OK.
7. Over current, HV side, phase- ground, phase- phase pickup trip test performed OK.
8. Tap changer auto local remote test performed OK.
9. Differential HV side & LV side phase- ground phase- phase test performed OK.
10. Differential balancing test performed OK.
Oil test result:
Bottom Top
80kv 80kv
Tap changer 78.6kv

23. Megger test result with 5Kv megger:
15 Sec 60 Sec FF
HT/E 28000MΩ 40000MΩ 1.42
LT/E 18000MΩ 30000MΩ 1.66
HT/LT 32000MΩ 45000MΩ 1.45
TTR Test of power transformer31.5/40MVA:
TAP NO. RY/rn YB/yn BR/bn V Calculated
value
1 21.820 21.825 21.615 145200 21.868
2 21.615 21.620 21.450
3 21.450 21.455 21.260
4 21.265 21.265 21.090
5 21.090 21.095 20.930
6 20.930 20.935 20.750
7 20.750 20.755 20.570
8 20.570 20.575 20.385
9 20.385 20.390 20215
10 20.815 20.220 20.020
11 20.020 20.025 19.860
12 19.860 19.865 19.670 132000 19.880
13 19.670 19.675 19.485
14 19.485 19.490 19.495
15 19.310 19.315 19.310
16 19.120 19.125 19.120
17 18.940 19.945 18.940
18 18.775 18.780 18.775
19 18.560 18.565 18.560
20 18.415 18.420 18.415
21 18.215 18.220 18.215
22 18.040 18.045 18.040
23 17.860 17.865 17.860 118800 17.892
Short circuit test of power transformer31.5/40MVA:
Applied voltage RY 396V 71B 391V BIR 395
TAP
NO.
R Y B R Y B N
1 3.25 3.27 3.29 42.5 40.2 41.7 0.4
2 3.26 3.34 3.34 42.7 41.0 42.5 0.4
3 3.38 3.42 3.42 43.3 42.1 43.1 0.4
4 3.47 3.50 3.51 44.2 42.07 43.6 0.4
5 3.54 3.56 3.58 44.7 43.1 44.0 0.4
6 3.62 3.65 3.65 45.5 43.6 44.7 0.4
7 3.71 3.75 3.75 46.3 44.5 45.5 0.4
8 3.77 3.83 3.83 46.8 45.2 46.2 0.4
9 3.87 3.93 3.93 47.4 45.7 46.9 0.4
10 3.94 3.99 4.01 48.0 46.3 47.3 0.4
11 4.07 4.08 4.09 48.5 47.1 46.0 0.4

24. 12 4.11 4.18 4.20 49.4 47.7 48.6 0.4
13 4.22 4.27 4.30 49.7 48.1 49.2 0.4
14 4.30 4.36 4.38 50.1 49.7 49.7 0.4
15 4.38 4.43 4.45 50.9 49.9 50.0 0.4
16 4.46 4.54 4.58 51.0 50.7 50.7 0.45
17 4.55 4.63 4.65 51.7 51.1 51.1 0.45
18 4.66 4.72 4.74 51.8 51.3 51.7 0.45
19 4.76 4.82 4.84 53.3 51.7 52.3 0.45
20 4.83 4.92 4.95 53.9 51.8 52.8 0.45
21 4.92 5.01 5.05 54.0 52.4 53.3 0.45
22 5.00 5.5 5.07 54.4 52.6 54.1 0.45
Voltage ration test:
Applied voltage RY 396V 71B 391V BIR 395
TAP NO. RY YB BR Rn yn Bn
1 31.2 31.2 31.6 18.2 18.0 18.2
2 31.5 31.5 31.9 18.4 18.3 18.4
3 31.8 31.7 32.1 18.5 18.4 18.6
4 32.0 32.0 32.4 18.7 18.5 18.8
5 32.2 32.1 32.6 18.8 18.7 19.0
6 32.5 32.3 32.8 19.0 18.9 19.1
78 32.7 32.7 33.2 19.2 19.1 19.3
9 33.1 33.2 33.4 19.3 19.3 19.5
10 33.4 33.5 33.8 19.5 19.5 19.6
11 33.7 33.9 34.1 19.7 19.6 19.9
12 33.9 34.2 34.4 19.9 19.7 20.0
12 34.2 34.3 34.6 20.0 19.9 20.1
13 34.4 34.6 34.8 20.1 20.0 20.2
14 34.7 35.0 35.1 20.3 20.2 20.4
15 35.1 35.2 35.5 20.5 20.4 20.7
16 35.4 35.6 35.7 20.6 20.5 20.8
17 35.6 36.1 36.1 20.9 20.8 21.0
18 36.2 36.4 36.5 21.1 21.0 21.3
18 36.5 36.6 36.9 21.3 21.2 21.5
19 36.6 37.0 37.0 21.5 21.4 21.6
20 37.1 37.1 37.4 21.6 21.6 21.7
22 37.3 37.3 37.6 21.8 21.8 21.8
23 37.6 37.5 38.0 21.9 21.9 21.9
C&DF test of power transformer 31.5/40MVA PEL:
HT/LT MODE Ma Watts DF% C/L
1 GST-GND-
RB
25.86 0.604 0.25 8312PF
2 GST-GAR-
RB
8.507 0.158 0.18 2733PF
3 UST-UST-R 17.37 0.444 0.25 5578PF

25. LT/HT
4 GST-GND-
RB
47.42 1.173 0.24 12213PF
5 GST-GAR-
RB
30.04 0.721 0.24 9631PF
6 UST-UST-R 17.41 0.448 0.25 5578PF
HT+LT/BODY
7 GST-GND-
RB
38.95 0.890 0.22 13368PF
C&DF test of 132KV BUSHING
R -Phase UST-UST-R 0.653 0.027 0.40 207PF
Y -Phase UST-UST-R 0.641 0.020 0.30 204PF
B -Phase UST-UST-R 0.632 0.020 0.30 203PF