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1、Switchgear selection for a Switchboard incomer,PCS 03 Specification Seminar,Glossary,CB: Circuit BreakerLBS: Load Break SwitchO/L: OverloadS/C: Short circuitPnB: Panel BuilderTfo: Transformer,Part 1: ScopePart 2: The three questionsPart 3: Other solutionsPart 4: SynthesisAppendixes,Contents of the s
2、eminar,Part 1 The ScopeWhat to put as incomer gear?,Main SWBD,Sub SWBD,?,BB2,BB1,CB1,?,CB2,Main SWBD,BB1,CB1,?,Part 1 The Scope The PFC Capacitor panel GOOD example,Generally the PFC Capacitor panels are equiped with a LBS Disconnector as incomer.Its widely recognized as a good & efficient solution
3、in agreement with the Standards.IEC 60364 for installation rulesIEC 60364-5-53 536.2 requires a Disconnector for isolationNO requirement of additional protectionIEC 60947-3 for DisconnectorsIt is an example of a good design!,MSWBD,Capacitor panel,Generally in the same panel or very close,CB1,LBS,Par
4、t 1 The Scope Protection schemes,Starting from a caricature of a bad design we understand the good one!This common knowledge is based on sound Standards implementation ,Which CB is necessary? Which design is good?,The only good design!,Part 1 The Scope What is really technically at stake ?,Main SWBD
5、,Sub SWBD,x,BB2,BB1,Remaining issue: S/C on BB2 (ex: after maintenance),S/C on the link cable : cleared by CB1 ,S/C or O/L : cleared by CB 2 ,CB1,CB2,Part 2 The three questionsJust three questions,What is the IEC Standard requirement on a SWBD incomer?What is the IEC Standard requirement to add a CB
6、 in a circuit?What are the consequences if I put 2 CBs of same rating in series?,Part 2 The three questions Standard requirement on SWBD incomer: DISCONNECTION,IEC 60364-5-53 536.2 requires a Disconnector for isolationDisconnector = IEC 60947-3A LBS or CB can be a Disconnector4 poles in TNS, TNC-S,
7、ITA LBS Disconnector is the de facto standard.A Disconnector cant switch ON LOAD.Simple operation Disconnector can be operated ON LOAD.,Main SWBD,Sub SWBD,IEC 60364-5-53 536.2 Isolation: Disconnection for manual operation,?,Disconnector,DisconnectorLoad Break Switch,AC 21, 22, 23,AC 20,Part 2 The th
8、ree questions Standard requirement to add a CB: a change in the current carrying capability,IEC 60364-4-43O/L 433.2 S/C 434.2 New protection device only when there is a change in the current carrying capabilityCB1 & BB2 are of the same rating No CB required,Main SWBD,Sub SWBD,No change in the curren
9、t carrying capability no CB required.,CB1,BB1,CB2,BB2,Part 2 The three questions Consequences if 2 CBs are in series: no selectivity,no limitation curves, worse protection against S/C,Anyway, a CB is put on the incomer OR a LBS of the same “technology family” than CB1Necessarily of the same rating t
10、han CB1 (same current).Same manufacturer, then same contact system.NO selectivity Vs CB1 !2 negative consequencesDesigner responsibility is engagedLess protection against S/C: risk of fire!,Main SWBD,Sub SWBD,A CB is put here anyway,CB1,BB1,CB2,BB2,WHY,Part 2 The three questions Consequences if 2 CB
11、s are in series: no selectivity,In case of Short Circuit, we cannot predict which CB will trip first.Both CB curves are strictly identical in the S/C area (same contact system).Setting the tripping parameters in case of overload or short delay is uselessAs no fault will occur in the region of the se
12、ttings.,time,CB2 : 630A,CB1 : 630A,Exactly the same curves,CB1,CB 2,Current,SAME contact system!,Part 2 The three questions Consequences if 2 CBs are in series: Designer responsibility is engaged, worse protection,with 2 CBs or more, the Designer responsibility is at stake: no available limitation c
13、urve.,More energy in the BB No curve,NOT VALID,Max limitation, min let through energy Curves are OK,Part 3: Other solutions Some other solutions,LBS / FDS + tripping: for ELC detection earth leakage detected at the panel level. Upper CB doesnt trip. Sidermat - Fusomat,FDS + uR Fuse: best CoS + prote
14、ction uR fuse for avoiding conflict on s/c on the BB (very low It) uR fuse doesnt blow on O/L Fuserbloc,Part 3 Synthesis Other manufacturers promote LBS solution,ANSWER is NO,Example ABB: extract from ABB LV technical application document.ABB has a TRUE LBS (OT) of different technology than CB.,Part
15、 3 Synthesis Other manufacturers promote LBS solution,Same for Schneider electric.But, INS and Compact: same contact system,Part 3 Synthesis Sub switchboard incomer - Overview,On closing on S/C after maintenance, no arc and gas projection. On intervention after a s/c on BB2:s/c on cable or in SSB CB1 trips100% guarantee that the sub distribution board is off,BB2,Main SWBD,Sub SWBD,BB1,CB1,