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GAS FILLED HV WALL BUSHING
OPERATING AND MAINTENANCE
Rev.
Description
0
Emission
Substituted specific values with
1
references to drawings. Added Gas
Monitor paragraph
2
Company name udated
Storage and transport conditions
3
updated
GRID SOLUTIONS
PWS - PWHS
INSTRUCTIONS
Date
Prepared
24/11/2014
AF
06/03/2015
AF
07/07/2016
AF
22/08/2016
AF
Controlled
LP
LP
LP
LP
IS 2653 GB
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Related Manuals for GE PWS
Summary of Contents for GE PWS
- Page 1 GRID SOLUTIONS GAS FILLED HV WALL BUSHING PWS - PWHS OPERATING AND MAINTENANCE INSTRUCTIONS Rev. Description Date Prepared Controlled Emission 24/11/2014 Substituted specific values with references to drawings. Added Gas 06/03/2015 Monitor paragraph Company name udated 07/07/2016 Storage and transport conditions...
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Page 2: Table Of Contents
Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 2 of 18 Tel. 02-24105.001 LIST OF CONTENTS Introduction ..........................3 Safety ............................3 Preliminary operative information ..................4 Transport and storage conditions ....................5 Transport conditions ...................... -
Page 3: Introduction
Sesto San Giovanni, MI 20099 Italy Page 3 of 18 Tel. 02-24105.001 Introduction These instructions are applicable to the gas SF6 insulated HV wall bushings of the series PWS/PWHS and provide all information relevant to: • Safety aspects. • Transport conditions. -
Page 4: Preliminary Operative Information
The following notes are mandatory for personnel 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 device. Operations on the valves, pressure gauges, pipes, protective devices must be performed by qualified operators, with the proper equipment and respecting the instructions of this manual. -
Page 5: Transport And Storage Conditions
Shock indicators of suitable sensitivity are fixed on the crate walls. They turn the status when the shock exceeds the indicator trigger level. GE Grid Solutions RPV will not respond of any damage due to un-proper operations. Removal or damage of the shock recorders will cause the interruption of the warranty. -
Page 6: Storage Conditions
Technical characteristics PWS and PWHS bushings are based on gas technology (pure SF6 or SF6-N2 mixture). The electric field is controlled by suitable electrodes that are placed inside and outside the bushing. The internal electrical strength capability is ensured by the gas density, while the external withstand capability is ensured by composite insulators of adequate length and creepage distance. -
Page 7: Bushing Preparation And Installation
• Figure 2 – Visual external shock recorder Figure 3 – Example of the transport pressure gauge Any damage of the crate, of the goods inside or lack of gas pressure must be reported to GE Grid Solutions RPV Supervisor. -
Page 8: Bushing Unpacking
Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 8 of 18 Tel. 02-24105.001 Bushing unpacking Unpacking operation and the subsequent activities must be performed in a clean and controlled environment ambient. A closed and confined area with a concrete floor and adequate lifting facilities is necessary for all the preparation operation. - Page 9 Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 9 of 18 Tel. 02-24105.001 Figure 6 – Example of lifting hooks on main flange and on outdoor and indoor sides extremities To lift the bushing connect the crane to the central flange hooks and use a pulling device (Tirfor) to connect the hooks placed on the outdoor side flange to compensate the mass unbalancing (see Figure 7).
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Page 10: Gas Sf6 Characteristics And Gas Filling Instruction
≤1 ppm Table 1 - Characteristics of new SF6 gas according to GE Grid Solutions RPV and premium Supplier The minimum requirement is that the characteristics will be in accordance with the data listed in the GE RPV limits column. -
Page 11: Gas First Filling Operation And Control Of Alarm And Tripping Signals
The bushing is shipped in slight overpressure of SF6 gas (See Chapter 5.1). If the pressure is positive proceed in the operation as follows, unless contact GE Grid Solutions RPV Supervisor for additional instructions. Install a calibrated vacuum / pressure digital gauge to one DILO valve on the bushing •... - Page 12 Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 12 of 18 Tel. 02-24105.001 Connect the gas filling equipment (gas plant or SF6 system for direct filling from gas bottles) to the • filling valve of the bushing flange.
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Page 13: Gas Density Monitor
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 GE Grid Solutions RPV for support, instructions and approval. -
Page 14: Power Factor Taps
Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 14 of 18 Tel. 02-24105.001 Power factor taps The bushing is equipped with two PF taps, one for the indoor side and the other for the outdoor side of the bushing. - Page 15 Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 15 of 18 Tel. 02-24105.001 Time base 6 Months 1 Year When plant is off Table 2 – Composite insulator maintenance plan Visual inspection: Carefully check that the composite insulators sheds do not show any mechanical damages and significant tracking or erosion due to electrical stress.
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Page 16: General Maintenance Plan
Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 16 of 18 Tel. 02-24105.001 Time base 3 Months 1/2 Year When plant is off Table 3 – Composite insulator intensive maintenance plan General maintenance plan The general maintenance plan is described in the next Table 4. - Page 17 5 years leakage the flanges joints and the gas valves. In case of frequent re- filling, plan replacement bushing and contact GE Grid Solutions RPV. Regenerate / replace the Check moisture content gas if moisture exceeds Gas quality 5 years accordance to IEC 60480.
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Page 18: Disposal At The End Of Life
Nuova Via di Piano Comprensorio Vulcano IS 2653 GB Sesto San Giovanni, MI 20099 Italy Page 18 of 18 Tel. 02-24105.001 Disposal at the end of life At the end of the bushing operative life all parts can be recycled or disposed as follows: Part Material Action...