Adjustment of SF6 pressure

Transcription

1 General FBX is a pressurised, sealed unit device in accordance with IEC It therefore does not require any periodic refilling. Any abnormal drop in pressure must be subject to corrective maintenance. This additional refilling is necessary where the filling pressure has voluntarily been brought back to atmospheric pressure for regulatory reasons, for transportation or otherwise. Additional information to that given in instruction manual AMTNoT Apply the general safety instructions for electrical locking-out operations and the special rules for the network concerned. The operations described below are to be carried out BEFORE energizing the FBX. Tools necessary for the operations described Cutting pliers Allen key for hexagonal screws size 4 Torque wrench with a 32 mm open-end wrench 32 mm open-ended spanner Flat blade screwdriver White Kubler grease, with a methylsilicone oil base 27 Symbols & conventions Code for a product recommended and marketed by Schneider Electric Tightening torque value Example: 1.6 dan.m CAUTION! Remain vigilant! Precautions to be taken in order to avoid accidents or injury INFORMATION - ADVICE Your attention is drawn to a specific point or operation. 1 AMTNoT173-02

2 Refilling equipment necessary An SF6 gas bottle A pressure reducing valve equipped with a connecting hose for a Schrader automatic valve (see detail opposite) A pressure gauge (manometer) with the same connector as above This instruction manual This refilling kit can be supplied to order. Detail view of Schrader valve Threading 7.747x0.794 ISO profile Removal of the manometer (model shown without contacts) The filling valve is located in the upper right-hand corner of the FBX. Unscrew the 2 fixing screws of the LV drawer display panel (Allen key for hexagonal screws size 4). Pull out the front facing panel until it stops. AMTNoT

3 Unscrew the 2 upper panel fixing screws (Allen key for hexagonal screws size 4). Pull out the upper panel: the manometer is now accessible. For manometers with contact, de-energize the LV auxiliary circuits, then identify and disconnect the wires from the contact. Loosen the manometer, using a 32 mm open-ended spanner. Remove the manometer. Handle this manometer with care and keep it sheltered from any shocks or pollution. General instructions for handling and storing gas bottles under pressure Ensure that the gas tap is in good condition and is protected by a protective cover. Avoid shocks. Do not expose the bottles to a temperature higher than +50 C. The SF6 gas bottles must be stored away from corrosive agents (water, water vapour, saline atmosphere, pollution of all kinds). General instructions for pressure adjustment Reminder: Pressure adjustment is only necessary in the case of an FBX delivered with reduced pressure. Tools required: 1 open-ended spanner size 30 1 SF6 gas pressure filling and adjustment kit Duration: 0h30 3 AMTNoT173-02

4 The switchgear should have the same temperature as the equipment room in order to carry out a corrective measure. Otherwise, it is advisable to wait for 24 hours. The gas bottle must always be in the vertical position. Reminder of the weights and pressures of SF6 gas for FBX Switchboard SF6 Weight (Kg) C or RE or R 1,05 T1 1,28 T2 1,37 C-T1 1,74 RE-T1 1,75 CC or RE-C 1,84 RE/C-T2 1,87 C-CV 2,24 C-C-T1 or C-RE-T1 2,57 R-RE-T1 or R1-RE-T1 C-C-C or C-C-R2 2,65 Relative pressure (bar) Filling pressure (bar) C-C-T2 or C-RE-T2 2,80 C-C-CV 3,32 0,3 ( -0, +0,05 ) 1,3 ( -0, +0,05 ) à 20 C C-C-C-T1 3,54 C-T1-C-T1 3,44 C-C-C-C 3,67 C-C-C-CV 4,35 C-C-C-T2 3,74 C-T2-C-T2 3,62 C-C-C-C-C 4,60 C-C-C-C-T1 4,49 C-C-T1-C-T1 4,37 C-T1-C-T1-T1 4,61 C-T1-T1-T1-T1 5,24 The weight of the SF6 is indicated for a complete refill of the FBX. At atmospheric pressure, the FBX already contains a certain volume of gas. The additional filling pressure will only now be equal to a quarter of the total filling pressure recommended above. AMTNoT

5 Pressure Temperature Diagram Diagram of filling pressures as a function of the ambient temperature 1310 mbar at 20 C Pressure Pressure adjustment procedure Unscrew the protective cover from the SF6 gas bottle. Loosen and remove the protective nut from the orifice of the gas output (30 mm open-ended spanner). Fit the seal in position, then screw on the pressure reducing valve (light tightening, by hand). 5 AMTNoT173-02

6 Place the gas bottle on the roof of the FBX. Open the bottle. Adjust the value of the filling pressure by using the lower screw. Do not exceed the recommended pressure. Open the far end valve. The relative pressure is indicated for an ambient temperature of +20 C. It will be necessary to correct the filling pressure whilst taking into account the ambient temperature at the time of the operation (refer to the Pressure - Temperature diagram on page 5). Close the bottle again as soon as the dial on the pressure reducing valve indicates the desired pressure adjustment. Control the pressure with the manometer. AMTNoT

7 Refitting the manometer (model shown without contacts) The manometer s needle must be positioned between the 2 small black lines. 27 Ensure that the leaktight seal is clean and still coated with grease. If not, clean it then apply a fine film of grease. Ensure that the seating of the seal, on the welded end-piece on the tank, is clean and scratch-free. Present the manometer to its housing, in the position shown above. Tighten the fixing ring, the needle indicates the pressure. 7 AMTNoT173-02

8 4 Tighten the ring to the torque indicated. Ensure that the pressure displayed is correct. Re-connect the wires of the contact, if appropriate. Re-assemble the upper panel (see page 2). Refit the front plate (see page 2) Schneider Electric - All rights reserved Schneider Electric 35, rue Joseph Monier CS Rueil-Malmaison Cedex, France RCS Nanterre Capital social As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication. This document has been printed on ecological paper Publishing: Schneider Electric Design: Schneider Electric Printing: AMTNoT