Vacuum Generator Circuit Breaker - A trend-setting power plant technology Stefan Schmid, Business Development Generator Breaker Switchgear siemens.at/future-of-energy
for the power supply of tomorrow Table of content Advantages to use a generator circuit breaker Properties of generator breakers Vacuum technology Switchgear portfolio HB3-80, Phase isolated high-current generator switchgear VB1-D, Draw-out generator and high-current switchgear Customer benefits - reduction of total cost of ownership Page 2 2015-05-07
Advantages to use a generator circuit breaker System Q Reliable synchronization and power plant operation Synchronize the generator G with the system Half-sized generator configuration T GSUT Highest security of supply Uninterrupted aux. supply via AT with generator being switched off GCB Improved protection Interrupt generator-source faults to prevent tank rupture of GSUT and AT Interrupt system-source faults to protect downstream busbar system and generator Interrupt unbalanced load conditions of generator or thermal overload of GSUT G AT LV Grid from G GCB GSUT Page 3 2015-05-07 AT
Properties of generator breakers - technical characteristics Major technical characteristics Distribution breaker Generator circuit breaker Standard IEC 62271-100 IEEE C37.013 TRV amplitude factor 1.4 1.54 TRV rate ( at 100MVA ) 0.41kV/µs 4.0kV/µs DC-component 36% > 50% Peak s.c. making current (at 60Hz) 2.6 x Isc (2.5x at 50Hz) 2.74 x Isc Short-time current duration 1s (optional 3s) 3s Out-of-phase switching for 24kV: recovery / peak voltage / RRRV 180 at 25% I sc 34.6kV / 61.2kV / 0.31kV/µs 90 at 50% I sc 29.1kV / 62.4kV / 3.3kV/µs Comparison of generator breaker types Siemens Vacuum GCB Typical Gas GCB Operating cycles at rated current 10,000 700-1,200 Interruptions at 100% rated short circuit current 30 ( 80kA ); 50 ( 50kA) 3-5 Monitoring of arc quenching medium not required required Capacitors to withstand the TRV rate not required required Use of green house gases / toxic decomposition products no / no yes / yes Page 4 2015-05-07
Properties of generator breakers distinguishing fault cases Case a Generator-source short circuit t ( contact parting ) T GSUT System AC-component decays faster as DC-component. Resulting asymmetrical current can cause delay of current zero for several cycles at the time of contact parting Case b System-source short circuit Current magnitude a b GCB No delay of current zero since DC-component is up to 75% only. Magnitude of current is comparatively high at the time of contact parting G G Verification of suitability is done by short circuit calculation based on IEC 60909-1. Complex network studies are done with simulation software PSS NETOMAC Page 5 2015-05-07
Vacuum technology advantages over gas generator breakers Compared to gas generator breakers with hydraulic driving mechanism Vacuum interrupters are hermetically sealed for live Breaking capability not affected by gas pressure no locking-out of operation at low gas pressure No deterioration of contact resistance no monitoring of interrupting current required No low ambient temperature concerns no heaters required down to -25 C No toxic decomposition products at the end of life time Spring-drive mechanism is maintenance free throughout is lifetime Opening time and speed is not affected by pressure and temperature No locking-out of operation at low oil pressure Page 6 2015-05-07
Vacuum technology - competency Siemens is the market leader for vacuum generator circuit breakers More than 2,400 total generator vacuum circuit breaker installed since 1990 Delivery of > 19,000 vacuum interrupters for high-performance applications 63kA Core components and technologies used in > 25,000 circuit breakers p.a. worldwide. Vacuum technology has well proven its benefits in medium voltage and is used today in 96% of all medium voltage circuit breakers. These benefits apply for generator applications as well Page 7 2015-05-07
Switchgear portfolio I r [A] S r [MVA] at: service voltage 10,000 6,700 4,000 3,000 HIGS NX AIR VB1 HB3 HB1 VB1-D GM-SG *) Fixed mounting switchgear 180 120 70 50 270 170 100 80 360 240 140 10.5 kv 15.75kV 21kV Drawout switchgear 40 50 63 72 80 *) Siemens Energy, Inc I sc [ka] Wendell, North Carolina 27591 USA Page 9 2015-05-07
HB3-80, Phase isolated high current generator switchgear Maximum ratings 24kV - 10,000A - 80kA Major standards Generator breaker IEEE C37.013 Switchgear IEC 62271-200 Seismic compliance IEC/TS 62271-210 Ed. 1 / IEEE 693 2400 mm Preferred connection method Isolated Phase Busbar (IPB), horizontally connected Indoor /outdoor installation up to IP66 for enclosure and control panel IP66 NEMA4 / NEMA4X. Maintenance free, environmental friendly vacuum technology Dimensions allow 1:1 replacement of competitor products Page 10 2015-05-07
VB1-D, Draw-out generator and high-current switchgear Maximum ratings 17.5kV - 4,300A ( 4,700A forced vent. ) - 63kA Major standards Generator breaker IEEE C37.013 Switchgear IEC 62271-200 2450 / 2950 mm Connection method Cable or solid insulated busbar Connection from top, bottom or rear side Indoor installation IP4X, expandable Maintenance free, environmental friendly vacuum technology Personnel safety IAC A FLR 63kA / 0.3s Reliability Loss of service continuity LSC 2B / PM Page 12 2015-05-07
Customer benefits - reduction of total cost of ownership High reliability and safety of generator switchgear Factory assembled and routine tested Design type tested acc. IEC 62271-200, vacuum GCB acc. IEEE C37.013 Verification of suitability of GCB by short circuit calculation acc. IEC 60909-1 Assessment of personnel safety based on IAC - type tests by pressure simulation and mechanical strength calculation Up to 75% cost reduction in service life No special field service required for installation and commissioning No maintenance required on vacuum GCB and switchgear components No gas and hydraulic monitoring required Page 14 2015-05-07
Contact page Stefan Schmid Business Development Generator Breaker Switchgear EM MS S PLM GBS 4 Hofmannstrasse 26 D - 91052 Erlangen Phone: +49 9131 733439 Mobile: +49 173 2532120 E-mail: stefan-oliver.schmid@siemens.com siemens.at/future-of-energy Page 15 2015-05-07