background image

              

 

 

Nuova Via di Piano Comprensorio Vulcano 

Sesto San Giovanni, MI 20099 Italy 

Tel. 02-24105.001 

 

IS 2653 GB

 

Page 

17

 of 

18

 

 

Bushing  locking  to 
the wall 

When plant is off 

Check  that  all  bolts  are  properly 
locked to the wall support. 

 

Component 

Time base 

Description 

Notes 

Power factors taps 

When plant is off 

Open the taps and clean inside. 
Check  the  internal  spring  loaded 
contact and clean it. 
Perform  a  Megger  1  kV  insulation 
test R

ins

 > 1 MOhm. 

Check  for  gas  leakages  by  sniffing 
the indoor side of the tap. 
Carefully close and tighten the cap. 
 

CAUTION:

  PF  tap  cap 

MUST 

be 

accurately 

closed.  Missing  the  cap 
could  be  dangerous  and 
it  can  cause  an  electrical 
discharge 

at 

bushing 

energization. 

Rupture 

disk 

protection cover 

When plant is off 

Inspect the closure cap and the fixing 
screws. 

CAUTION:

 

Do 

not 

remove  the  closure  cap 
and do not touch the disk 
when the bushing is filled 
with gas. An explosion of 
the  disk  could  be  very 
dangerous. 
 
 

Gas density monitor 

5 years 

Check  calibration  and  operation  of 
micro switches. 

Check  the  effective  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 gas 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 

bushing  and  contact  GE 
Grid Solutions RPV. 

Gas quality 

5 years 

Check  the  moisture  content  in 
accordance to IEC 60480. 

Regenerate  /  replace  the 
gas  if  moisture  exceeds 
the  limits  stated  in  the 
standard (>25 mg/kg). 

 

Table 4 – Bushing general maintenance plan 

Содержание PWS

Страница 1: ...any name udated 07 07 2016 AF LP 3 Storage and transport conditions updated 22 08 2016 AF LP IS 2653 GB GE Proprietary Information Class III Confidential Export Controlled U S Government approval is r...

Страница 2: ...3 Storage conditions 6 4 Technical characteristics 6 5 Bushing preparation and installation 7 5 1 Controls at the arrival 7 5 2 Bushing unpacking 8 6 Gas SF6 characteristics and gas filling instructi...

Страница 3: ...oltages above 1000V 2 Safety In this document important safety requirements are highlighted by the word CAUTION and important operative instructions are evidenced by the word NOTE This manual must be...

Страница 4: ...ersonnel involved in wall bushing assembly All problems detected during the bushing installation must be reported to the Foreman and to GE Grid Solutions RPV Supervisor The bushing is a pressurized de...

Страница 5: ...nt of the crate during the transport it is responsibility of the transport company to carefully fix it on the vehicle by suitable retain systems like ropes synthetic pulling bands or any other method...

Страница 6: ...ed and tested in accordance with the IEC 62199 and IEC 60137 standard Each section is based on A composite insulator with silicone sheds The internal shielding arrangement An internal aluminium tube c...

Страница 7: ...the arrival Before proceeding with the unpacking operation it is necessary to perform the following controls Check the wooden crate status Check the external visual impact recorder s Open the crate a...

Страница 8: ...upports and it is locked by locking belts Additional intermediate belts support the composite insulator to a wooden structure Figure 4 Bushing crate inside view Figure 5 Bushing inside the crate top v...

Страница 9: ...ow the steps indicated into the provided erection and installation manual IS 2654 GB Figure 7 Example of bushing extraction and lifting CAUTION The two composite insulators are protected by a PE plast...

Страница 10: ...ium Supplier The minimum requirement is that the characteristics will be in accordance with the data listed in the GE RPV limits column The gas filling must be performed with an equipment that prevent...

Страница 11: ...e up to 0 2 MPa abs 1 bar gauge Pressure must be directly measured on the gas density monitors installed on the bushing flange Check all the gas seals for leakages with a suitable SF6 leak meter devic...

Страница 12: ...the DILO machine check that the machine set up is for gas filling and that the connecting pipe is full of SF6 In the case of direct filling from the bottle check that the bottle is effectively charged...

Страница 13: ...ation on the scale is expressed in MPa absolute referred to a gas temperature of 20 C This means that the instrument converts the gas density into a value of pressure referred to 20 C independently fo...

Страница 14: ...pair procedure is described into the component manual see reference in the summary prepared for the specific wall bushing The composite manufacturer can provide a repairing kit and also a technical su...

Страница 15: ...the camera must be properly set in order to avoid false signals and background noise In addition an infrared scan on the line terminal and the incoming cables can reveal incipient hot spots phenomenon...

Страница 16: ...Gas valves electrical equipment and connecting cables When plant is off Clean the cubicle Check for gas leaks Check functionality of pressure gauge and DILO Type valves Check terminal blocks wiring ca...

Страница 17: ...ect the closure cap and the fixing screws CAUTION Do not remove the closure cap and do not touch the disk when the bushing is filled with gas An explosion of the disk could be very dangerous Gas densi...

Страница 18: ...lectric terminals Copper silvered Dismount and recycle Toroids Aluminium Dismount and recycle Internal electrostatic shields Aluminium Dismount and recycle Transport supports Aluminium Recycle the alu...

Отзывы: