Vacuum Generator Circuit Breaker - A trend-setting power ... · PDF fileVacuum Generator Circuit Breaker - A trend-setting power plant technology . ... vacuum GCB acc. IEEE C37.013

Unrestricted © Siemens AG Österreich 2015. All rights reserved. siemens.at/future-of-energy

Vacuum Generator Circuit Breaker - A trend-setting power plant technology Stefan Schmid, Business Development Generator Breaker Switchgear

Unrestricted © Siemens AG Österreich 2015. All rights reserved.

2015-05-07 Page 2 S. Schmid / EM MS S PLM GBS 4

Siemens generator switchgear 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



GSUT

Siemens generator switchgear Advantages to use a generator circuit breaker

G

T

GCB

Q

AT

LV Grid

Reliable synchronization and power plant operation • Synchronize the generator G with the system • Half-sized generator configuration

Highest security of supply • Uninterrupted aux. supply via AT with generator being switched off

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

GSUT

AT

GCB from G AT

G

System



Siemens generator switchgear 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% Isc 34.6kV / 61.2kV / 0.31kV/µs

90°at 50% Isc 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



Siemens generator switchgear Properties of generator breakers – distinguishing fault cases

GCB

T

G

a

b

Case a → “Generator-source short circuit“ 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“ 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

Current magnitude

t ( contact parting )

Verification of suitability is done by short circuit calculation based on IEC 60909-1. Complex network studies are done with simulation software PSS ® NETOMAC

G

GSUT

System



Siemens generator switchgear 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



Siemens generator switchgear 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



Siemens generator switchgear Switchgear portfolio

service voltage 10.5 kV 15.75kV 21kV

Ir [A] Sr [MVA] at:

40 50 63 72 80

3,000

4,000

6,700

10,000

HB3

HIGS

VB1 HB1

50

70

120

180

80

170

270

NX AIR VB1-D

GM-SG *)

Isc [kA]

Fixe

d m

ount

ing

switc

hgea

r

100

360

240

Drawout switchgear

140

*) Siemens Energy, Inc

Wendell, North Carolina 27591 USA



Siemens generator switchgear 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

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

2400

mm



Siemens generator switchgear 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

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

2450

/ 29

50 m

m



Siemens generator switchgear 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



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: [email protected]

Siemens generator switchgear Contact page

siemens.at/future-of-energy

mailto:[email protected]

Vacuum Generator Circuit Breaker - A trend-setting power ... · PDF fileVacuum Generator Circuit Breaker - A trend-setting power plant technology . ... vacuum GCB acc. IEEE C37.013

Documents