High Speed DC Circuit Breaker - G E Power Controls

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6. Inspections and maintenance 6.1 List of inspections B. General functional inspection C. Inspection of the arc chute and contact system D. Inspection of the screw connections E. Inspection of the mechanic components Table 3 Customer. Trained technician. Customer. Trained technician. Customer. Trained technician. GE. Service technician. TYPE OF THE INSPECTION BY WHOM HOW OFTEN WHAT TO DO/CHECK A. General visual inspection Customer. Trained technician. Every 6-12 months • Check out damages or cracks of the frame, adapter or arc chute • Check out for missing screws or caps • Check out for deglutinated labels • Check out for corrosion • Check out distinct manifestations of flame or smoke at the frame • Clean the breaker from dirt and dust • Clean and degrease the cooper terminals Every 6-12 months • Close and open manually the breaker to check the drive and mechanism • Close the breaker electrically and open by trip unit(s) releasing, to check controls Every 6-12 months OR after: • high short circuit opening at >25kA • >300 openings at load current • >100 openings at over current load (2-3 *In) Every 6-12 months OR after every inspection: • of the arc runners • of the contacts • of the arc chute Every 5 years OR After 5.000 openings • Check out wear of the arc runners; shall not exceed 30% of its cross section • Check out wear of the pre-arcing contact. It shall not exceed 2mm [0,08in]. • Check out wear of the main contacts at fix and flexible side; shall not exceed 1mm [0,04in] of its depth. • Check out wear of the arc chute’s plates; check out for deposits inside of arc chute, this area shall be free of deposits. • Check out wear of protective walls; shall not exceed 1mm [0,04]. • Check out contacts’ tilt and gaps. Check out position of the countersunk screws in the sidewalls. Check for tight fitting or use torque tool (torque in SI and Imperial units): • M8 ~20Nm [~ 177 lbf*in] • M6 ~10Nm [~ 88 lbf*in] • M5 ~5Nm [~ 44 lbf*in] • M4 ~3Nm [~ 26 lbf*in] • Carry out inspection B • Check out settings of contacts and auxiliary switches • Check out upper dumper of the mechanism; no cracks, deformation or heavy discolouration; hard consistency; without punctures • Check out main flexband breakage; shall not exceed 30% of its cross section • Check out wear of mini flexband; shall not exceed 30% of its cross section Required tools: Cleaning tissue, pocket lamp, hand lever, hexagon wrench SW5, SW6, small and medium screwdriver. 36 Design and specifications are subject to change without notice 01/2008
6.1.1 General visual inspection • Check out for damages or cracks of the frame, the adapter or the arc chute. • Check out the black marks on the countersunk screws. These shall be joined together. If any screw is loosening, shall be replaced with new one, using glue, Loctite222. Afterwards, mark the screw with black line to sign its position in nest. • Check out for missing screws or caps. • Check out for deglutinated labels. Clean and fix it. • Check out for corrosion. In case of finding significant corrosion, please contact GE representative for consulting. • Check out for distinct manifestations of flame or smoke at the frame. Especially in lower area of the breaker. Please document it and contact GE representative for consulting. • Clean the breaker from dirt and dust. Remove all dirt with a dry clothes. No particularly high signs of abrasion (rough chips) should be seen anywhere. • Clean and degrease the cooper terminals. 6.1.2 General functional inspection Pay attention to the warnings, Section 1! • In order to check the latch mechanism, the breaker can be opened and closed with a hand lever. • Switch remotely the breaker ON and OFF several times using ST or UVR, and using closing drive. The contacts must close after the CLOSE command and must open following the OPEN command • The breaker mechanism must not appear sluggish nor must ON/OFF be unduly delayed. 6.1.3 Inspection of the arc chute Pay attention to the warnings, Section 1! A) Remove the arc chute • [Fig. 41]. Loosen the clamping screws (3) and (4), using SW 5 hexagon wrench and take off the arch chute (1) from the adapter (2). B) Check the arc chute • [Fig. 42]. Check the arc chute’s interior, as far as possible, for deposits (1). There shall not be copper pearls on the metal-plates, which could partially link the plates. • [Fig. 42]. Check the general condition of the insulation plates (4). These shall no be bended or burned. Also other insulation shall not be heavily damaged. • [Fig. 42]. Check the arc horns (2). Its cross section shall not be reduced more than ~30%. • [Fig. 42] Check the splitting plates (3). These shall not be burned more than ~20mm [~0,8in]. C) Install the arc chute • [Fig. 41]. Put in arc chute (1) into adapter (2). • [Fig. 41]. Tighten front- and backside connections of the arc runners (3), including lock washer. Use a torque of 10 Nm [88 lbf*in]. • [Fig. 41]. Tighten front- and backside of the arc chute connections (4), including flat washers. Use a torque of 5 Nm [44 lbf*in]. 1 2 4 3 5 Fig. 40 Using of the hand lever Fig. 41 Arc chute and arc runners fixing S47183-e 01/2008 Design and specifications are subject to change without notice 37
Page 1 and 2: GE Consumer & Industrial Power Prot
Page 3 and 4: 1. Warnings and Safety Hints 1.1 Wa
Page 5 and 6: 2.2 Installation 2.2.1 Operational
Page 7 and 8: 3.2.3 Mechanism • The Gerapid is
Page 9 and 10: With correctly designed interlock i
Page 11 and 12: • The sensor includes Hall-probes
Page 13 and 14: Control box terminals 1x12-pole AC
Page 15 and 16: 4.2 Terminals wiring system 1 2 3 4
Page 17 and 18: 4.3.2 Voltage converter Voltage con
Page 19 and 20: 4.3.4 NEKO control unit -X16 -X10,
Page 21 and 22: 4.3.6 Shunt trip control unit Emerg
Page 23 and 24: 4.3.8 Indicators -X3 :8 -X3 :12 -X3
Page 25 and 26: 4.3.10 SEL measuring system 1) 2) S
Page 27 and 28: 5.1 Safety distances. Units call in
Page 29 and 30: 5.2.2 Gerapid 2607, 4207, 6007with
Page 31 and 32: 5.2.4 Gerapid 8007 with arc chute 2
Page 33 and 34: 5.2.6 Gerapid 2607, 4207 with V / V
Page 35: 5.2.8 Gerapid 8007 terminals Gerapi
Page 39 and 40: 6.1.5 Inspection of contacts’ til
Page 41 and 42: D) Install the adapter • [Fig. 48
Page 43 and 44: D) Changing the pre-arcing contact
Page 45 and 46: Fig. 55-4 Unscrew all the plugs fro
Page 47 and 48: 6.3 Spare parts list Component Type
Page 49 and 50: 7.2 Ordering Form. Gerapid with Arc
Page 51 and 52: 7.2.1 Example of order 2. USA custo
Page 53 and 54: 7.4 Troubleshooting. Switching ON i

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