background image

 

 

 

 

 

 

 

 

 

 

 

Rev. 

Description 

Date 

Prepared 

Controlled 

Service 

Approval 

 

Emission 

06/02/2017 

G.Testin 

P.Cardano 

M.Campana 

Rev. Rated filling pressure value, Outline drawings & relevant 

doc.18/04/2 

18/04/2017 

G. Testin 

P. Cardano 

M. Campana 

Rev. Transport pressure gauge installation, management & 

check list 

14/03/2018 

G. Testin 

P. Cardano 

M. Campana 

 

 

 

 

 

 

IS 2664 GB 

 

G

E

 E

n

e

rg

y

 C

o

n

n

e

c

ti

o

n

s

 r

e

s

e

rv

e

s

 a

ll 

ri

g

h

ts

 i

n

 t

h

is

 d

o

c

u

m

e

n

a

n

d

 i

n

 t

h

e

 i

n

fo

rm

a

ti

o

n

  

c

o

n

ta

in

e

d

 t

h

e

re

in

R

e

p

ro

d

u

c

ti

o

n

u

s

e

 o

d

is

c

lo

s

u

re

 t

o

 t

h

ir

d

 p

a

rt

ie

s

  

w

it

h

o

u

e

x

p

re

s

s

 a

u

th

o

ri

z

a

ti

o

n

 i

s

 s

tr

ic

tl

y

 f

o

rb

id

d

e

n

©

 2

0

1

1

 G

E

 E

n

e

rg

y

 C

o

n

n

e

c

tio

n

HVDC TRANSFORMER BUSHINGS 

PHI 530.1425.2500 

PHI 265.850.1500 

Kepco project 

 

 

 

OPERATING 

AND 

 

MAINTENANCE INSTRUCTIONS 

 

Summary of Contents for PHI 265.850.1500

Page 1: ...ressure gauge installation management check list 14 03 2018 G Testin P Cardano M Campana IS 2664 GB GE Energy Connections reserves all rights in this document and in the information contained therein Reproduction use or disclosure to third parties without express authorization is strictly forbidden 2011 GE Energy Connections HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco projec...

Page 2: ...t and oil parameters 21 8 Gas SF6 characteristics and gas filling instructions 24 8 1 Gas first filling operation and control of alarm and tripping signals 25 8 2 Gas refilling during the bushing normal operation 25 8 3 Gas characteristics before the energization 26 9 Procedure for bushing gas compartment decontamination 26 9 1 Procedure for bushings equipped with the gas filling station 26 9 2 Pr...

Page 3: ...word OBLIGATION while important operative instructions are evidenced by the word NOTE This manual must be available to the personnel responsible of the installation operation and maintenance of the bushings The transformer bushing is a high voltage DC device filled under pressure with SF6 gas that realizes the interface between the transformer and the convertor The arrangement of the bushing allow...

Page 4: ...ength must be 3m During this operation the workers must wear protective insulating gloves and boots and helmets with protective transparent face shield 2 1 Safety prescriptions and operative information The following notes are mandatory for personnel involved in transformer bushing installation All problems detected during the bushing installation must be reported to the Foreman and to GE Energy C...

Page 5: ...ly with the standard EN 397 OBLIGATION During all activities it is mandatory to use safety gloves complying with the standard EN 388 with performance index not less than 4131 OBLIGATION During all activities it is mandatory to use safety shoes complying with the standard EN 345 with of performance index not less than S2 OBLIGATION During works activities carried out at a height greater than 2m it ...

Page 6: ...sport pressure gauge see Figure 1 installed on a Dilo valve This device must be removed during the installation phase on the transformer before the bushing filling at rated pressure and it has to be reused for the bushing shipment at site In order to prevent dangerous movement of the crate during the transport it is responsibility of the transport company to carefully fix it on the vehicle by suit...

Page 7: ...crease the gas pressure to 0 5 bar gauge 0 150 MPa abs GE Energy Connections RPV must be informed concerning the activation of the long storage condition The periodical controls must verify the bushing conditions the gas pressure and its dew point and the overall status of the electric instruments the accessories and tools All data must be recorded in a specific check list NOTE Violation of the ab...

Page 8: ...t performances in case of high current ratings and harmonics presence The grading capacitor winding is 100 protected from the risk of pollution during the bushing installation on the transformer as it is fully sealed by special fibreglass barriers Next Table 2 reports the main electrical technical characteristics of the two bushing types and Table 3 reports the design environmental conditions The ...

Page 9: ...l Table 3 Environmental conditions 5 Bushing preparation All operators involved in components unpacking and assembly have to be careful not to damage the objects During the unpacking operation it is necessary to check that all components supplied by GE Energy Connections RPV are available and not damaged during the transportation All incoming goods must be stored in a covered area and prepared for...

Page 10: ...or Inside the crate the bushing is locked at the level of the central and the top flange by locking belts and bolts Figure 4 Lid sections locking screws Figure 5 Removing the lid sections WARNING Composite insulator and the oil side fibreglass cone are protected by a PE plastic foils Remove the protection on the composite insulator only just before the transformer energization The oil side cone pr...

Page 11: ...structions 3 Oil pressure Check if the oil pressure 1 bar gauge 20 C see Figure 8 Record the pressure and the average bushing temperature In case of deviations notify the Foreman and the GE Energy Connections RPV Supervisor Check for oil leakages Continue with the inspection but Wait for instructions 4 Bushing inspection Check the integrity of the oil side cone Check the bottom terminal and the Mu...

Page 12: ...uding steel rope RX38A162 01 1600 1 3 Lifting lug DN22 RX1A013 22 2000 1 4 Front plate lifting kit RX380463 02 2000 1 5 Front lifting rope Not included 1000 1 Not included 6 Bolts nut washers kit 1 set Table 5 PHI 265 Lifting and erection tool main parts Item Description Reference code WLL kg Quantity Picture 1 Lifting plates RX38A164 01 RX38A164 02 2500 1 set 2 Tirfor T532 D including steel rope ...

Page 13: ...hall have the following minimum characteristics Solution with one overhead crane Single grinder crane Crane capacity 2 5 t Hoist lifting height 12m Slow hoisting speed 1 3 m min Or as an alternative N 1 mobile telescopic crane with the following technical characteristics Single crane Lifting boom working length 17m Hoist lifting height 12m The capacity of the crane must comply with the characteris...

Page 14: ...ng tools it is necessary to follow this procedure Remove the crate walls Check that the bushing pressure is set at the transport pressure level Install the Lifting Plates Item 1 on the bushing flange Firmly tighten the bolts nuts at the prescribed torque see Table 7 Install the lifting lug Item 3 on the Lifting Plates and lock it carefully PHI 265 PHI 530 Install the Front Plate lifting kit Item 4...

Page 15: ...nstallation quote indicated in the bushing Outline drawing see Figure 7 Bushing PHI 265 Bushing PHI 530 Figure 7 Bushings bottom side and interface quote with the transformer barrier shield WARNING Before proceeding with the installation of the bushing on the transformer it is necessary that the bushing gas pressure is set at the transport value 0 25 bar gauge 0 125MPa abs NOTE Check that the oil ...

Page 16: ...g insertion inside the turret By continuously controlling that the turret and the bushings are aligned gradually insert the bushing inside the transformer turret NOTE During this operation it is mandatory to continuously check that the bushing cone will remain centred respect the turret flange and the CT coils arrangement normally placed inside the turret Check that there are no interferences and ...

Page 17: ...on at the factory production Concerning the ISO 11218 solid contamination limits classes next Table 9 summarizes the quantities and the size limits for each class Classes Maximum Contamination Limits particles 100ml ISO 11218 4 µm c 6 µm c 14 µm c 21 µm c 38 µm c 70 µm c 000 195 76 14 3 1 0 00 390 152 27 5 1 0 0 780 304 54 10 2 0 1 1560 609 109 20 3 1 2 3120 1220 217 39 6 1 3 6250 2430 432 76 11 2...

Page 18: ...racteristic of the selected expansion vessels the next Figure 8 shows the curves Pressure vs Average oil temperature for the two PHI bushings Figure 8 Oil pressure vs average oil temperature This curve is used in GE Factory to set the proper oil pressure at the end of the bushing production process and it is also useful to check the bushing status during the operation by controlling the oil pressu...

Page 19: ...ge is installed on a ball type valve for easy replacement in case on need and all electrical cables are wired in the junction box provided with DIN type terminal blocks see Appendix 2 Additional information about the oil pressure gauge device are in illustrated in Appendix 5 6 3 PHI Bushing filtering bypass valves PHI bushings are equipped with a special valve system located at the level of the ce...

Page 20: ...n the side of each filter valve block These connections are protected by a removable cap see Figure 11 By pass valves are placed in both type of blocks and are necessary to ensure the proper oil circulation during the normal bushing operation The by pass valve blocks are not equipped with the BSP connections Next Table 11 describes the correct valve positions as a function of the specific operativ...

Page 21: ... of the turret oil processing procedure Turret design and oil processing procedure are under the responsibility of the Transformer Manufacturer and the concepts illustrated in this part are not mandatory Required is in any case the achievement of the parameters for the oil inside the pressboard barriers and the turret listed in Table 13 The turret shall be designed to withstand the vacuum and it h...

Page 22: ...cedure includes the following steps Vacuum in the turret o Apply vacuum to the turret via the transformer oil conservator and the Buchholtz relay pipe o Vacuum level 0 1 kPa 1 mbar o Vacuum time at vacuum level 48 h Oil filling under vacuum from bottom o Minimum oil filling characteristics as in Table 12 No air has to remain trapped inside the transformer turret At the end of the overall filling p...

Page 23: ...l treatment machine to the valves B and C o Apply vacuum to the turret via the Buchholtz relay pipe o Vacuum level in the turret 0 1 kPa 1 mbar o Vacuum time vacuum level 3 h o Fill the turret from valve B with treated oil as in Table 12 No air has to remain trapped inside the transformer turret o Recirculate from valve C to valve B Top to Bottom for a minimum of 2 passes of total oil volume until...

Page 24: ...ust be checked and the data must be reported in the Gas filling check list see Appendix 8 The gas filling must be performed with an equipment that prevents dispersion of the SF6 gas in the atmosphere As an example next Figure 14 shows a gas plant manufactured by the German company DILO GmbH Figure 14 Vacuum filling gas plant DILO NOTE This bushing has to be operated with pure SF6 In case of need o...

Page 25: ...the pressure independently from the effective gas temperature Whatever the temperature of the gas the instrument indicates a pressure equivalent to a gas average temperature of 20 C This condition is directly related to the gas density inside the bushing see Chapter 10 8 2 Gas refilling during the bushing normal operation The bushing is a fully sealed unit and its leakage rate is 0 5 x year Anyway...

Page 26: ...ses SF6 transport pressure below the specified limits and or with gas dew point 30 C at atmospheric pressure Evidence of gas dew point 20 C at rated filling pressure before the energization Evidence of gas dew point 18 C at rated filling pressure during the normal operation Opening of the bushing for internal inspection Note This procedure in not applicable in case of evidence of internal pollutio...

Page 27: ...s located at the bushing flange 10 Gas density monitor The bushing is equipped with two gas density monitors manufactured by Electronsystem The two instruments are different as one is a normal gas density monitor while the other is equipped with an electronic pressure transducer 6 20 mA for remote indication hybrid type These devices ensure a great accuracy in the measurement as they are based on ...

Page 28: ...on box provided with DIN type terminal blocks for easy assembly and maintenance see Appendix 2 Additional information about the gas density monitor devices are illustrated in Appendix 4 NOTE Due to the instrument principle of operation the replacement of bushing gas from SF6 to a gas mixture SF6 N2 is not allowed without replacing the gas density monitors with the proper type In this case contact ...

Page 29: ...rough the PF tap The main characteristics are Parameter Description Value V1L Rated line to line voltage 220 kV V1Lmax Maximum line to line voltage 230 kV V2L Rated line to line secondary voltage at V1L 100 V Accuracy Max voltage ratio error at RL 3 Burden Max VA load 0 01 VA RL Min resistive load 1 MOhm Bandwith 3 dB 10Hz 10kHz Table 17 Voltage divider technical characteristics The unit is compos...

Page 30: ...yer Cleaning of the composite insulator is necessary only in case of heavy contamination Due to the installation on the bushing inside the valve hall cleaning by washing is not possible In this case cleaning can be done only manually by using a sponge and demineralized water The composite must be accurately rinsed and then dried with clean cotton fabric pieces In case of heavy contaminated areas u...

Page 31: ...e of evidence of incipient erosion tracking plan an immediate cleaning action UV camera and infrared examination Scan all the surface of the composite insulators with an UV camera to identify possible areas of intense UV emissions on the sheds on the toroids and the incoming cables To perform this test the camera must be properly set in order to avoid false signals and background noise In addition...

Page 32: ...rent terminals When plant is off Check for evidence of hot spots Check the terminals and tighten the connecting bolts to the bushing flange Check the cable clamps and the bolting to the terminal Anticipate the controls if IR camera reveals hot spots Contact GE Energy Connections RPV in case of evidence of hot spots during the inspection Grounding terminals on the bushing flange When plant is off C...

Page 33: ...ctive and correct operation of the alarms tripping signal chain from the instruments to the substation systems Bushing overall gas leakage 5 years Check with SF6 leak meter device all the flanges joints and the DILO valves Anticipate the control if the leakage rate is excessive and gas re filling is frequent Identify the leakage areas In case of frequent re filling plan for the replacement of the ...

Page 34: ...Copper silvered Dismount and recycle Toroids Aluminum Dismount and recycle Internal electrostatic shields Aluminum Dismount and recycle SF6 and oil side cones Fibreglass Dismount and dispose Aluminum Recycle the aluminum Composite insulators with flanges Fibreglass Dispose or thermo destruction Silicone Dispose or thermo destruction Aluminum Dismount and recycle Electrical wiring Aluminum Recycle ...

Page 35: ...appendices Appendix 1 Bushing outline drawing Appendix 2 Electrical scheme Appendix 3 Lifting tools Appendix 4 Gas density monitor Electronsystem Appendix 5 Oil pressure gauge Appendix 6 Composite insulators maintenance and repairing Appendix 7 Bushing installation check list Appendix 8 Filling gas check list ...

Page 36: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 36 of 70 PHI 265kV 1500A Appendix 1 Bushing outline drawing ...

Page 37: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 37 of 70 PHI 530kV 2500A ...

Page 38: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 38 of 70 PHI 265kV 1500A Appendix 2 Electrical scheme ...

Page 39: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 39 of 70 PHI 265kV 1500A ...

Page 40: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 40 of 70 PHI 265kV 1500A ...

Page 41: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 41 of 70 PHI 265kV 1500A ...

Page 42: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 42 of 70 PHI 265kV 1500A ...

Page 43: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 43 of 70 PHI 265kV 1500A ...

Page 44: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 44 of 70 PHI 265kV 1500A ...

Page 45: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 45 of 70 PHI 530kV 2500A ...

Page 46: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 46 of 70 PHI 530kV 2500A ...

Page 47: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 47 of 70 PHI 530kV 2500A ...

Page 48: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 48 of 70 PHI 530kV 2500A ...

Page 49: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 49 of 70 PHI 530kV 2500A ...

Page 50: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 50 of 70 PHI 530kV 2500A ...

Page 51: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 51 of 70 PHI 530kV 2500A ...

Page 52: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 52 of 70 PHI 265kV 1500A Appendix 3 Lifting tools ...

Page 53: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 53 of 70 PHI 265kV 1500A ...

Page 54: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 54 of 70 PHI 265kV 1500A ...

Page 55: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 55 of 70 PHI 265kV 1500A ...

Page 56: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 56 of 70 PHI 530kV 2500A ...

Page 57: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 57 of 70 PHI 530kV 2500A ...

Page 58: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 58 of 70 PHI 530kV 2500A ...

Page 59: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 59 of 70 PHI 530kV 2500A ...

Page 60: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 60 of 70 Appendix 4 Gas density monitor Electronsystem ...

Page 61: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 61 of 70 ...

Page 62: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 62 of 70 ...

Page 63: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 63 of 70 ...

Page 64: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 64 of 70 ...

Page 65: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 65 of 70 Appendix 5 Oil pressure gauge ...

Page 66: ...HVDC TRANSFORMER BUSHINGS PHI 530 1425 2500 PHI 265 850 1500 Kepco project IS 2664 GB Page 66 of 70 Appendix 6 Composite insulators maintenance and repairing ...

Page 67: ...ording At oil gauge _________ bar gauge tavg _________ C In case of pressure not in line wth the diagram pressure temperature Figure 8 or evidence of oil leakages contact GE Energy Connections RPV Check the composite insulator status the top terminal and the relevant accessories No damages Take pictures and inform GE Energy Connections RPV Check the oil side cone the contact springs and the releva...

Page 68: ...rt the bushing into the turret Check that the cone will not interfere with the metal parts of the turret and the CT and that the oil side cone is not damaged No damages on the cone are allowed In case of damages on the cone surface Contact GE Energy Connections RPV Remove the bushing from the turret and put it on the stationary support Close the transformer turret with the manhole Stop the activit...

Page 69: ...rates 0 55 MPa abs Check the remote reading of the gas pressure sensor Gas pressure B3 B4 ______ _____MPa abs Remote pressure ________________MPa bs Increase the gas pressure until Alarm 1 contact operates 0 58 MPa abs Check the remote reading of the gas pressure sensor Gas pressure B3 B4 ______ _____MPa abs Remote pressure ________________MPa bs Increase the gas pressure at the rated filling valu...

Page 70: ...ficates ppm by weight from measurements Bottle S N Bushing S N SF6 content by weight Air CF4 H2O Mineral oil Total acidity expressed in HF Hydrolizable fluorides in terms of HF Dew point at amospheric pressure SF6 content by weight HF SO2 Reference data 99 9 500 ppmw 500 ppmw 15 ppmw 10 ppmw 0 3 ppmw 1 ppmw 40 C 99 9 1 ppmw 0 ppmw Date Prepared by Controlled by ...

Reviews: