direct current circuit breaker howdoesitwork_alstom
TRANSCRIPT
-
8/10/2019 Direct Current Circuit Breaker Howdoesitwork_Alstom
1/1
ULTRA-FAST DC CIRCUIT BREAKER HOW DOES IT
Temporisation branchconducts the current duringinitial step of interruption
Arming branchrises voltage tostop current rise
Highvoltage
conductor
A L S T O M U LT R A - F A S T D C C I R C U I T B R E A K E R
Main branchconducts permanent current
HVDC breaking principle
I nser t a sur ge a rr es te r i n ser ie s C om muta ti on s co nt ro ll ed b y i nt er na l c on tr ol a nd c om ma nd
High voltage conductorMain branch
Electronic switches (feLow power dissipation
Arming branchPower Electronics (switches)
Arming branch
Capacitor bank
ExtinSurge arrand bring
Main branchUltra-fast mechatronic switches
BREAKINGSTEP
BREAKINGSTEP
BREAKINGSTEP
BREAKINGSTEP
ON state: all the current fows through the main branch Fault detection
The surge arrester absorbs the energycurrent to zero
Current is commutated into the arming branch to increase thevoltage up to surge arrester threshold
1 2
54
Ultra-fast DC Circuit Breaker design
High voltage conductor
Extinguishing branchabsorbs energy and
brings the current to zero
Highvoltage
conductor
Fault inception
rise of the current
Rise of magnetic energy in
the network
Circuit-breaker opposes a
voltage and absorbs energy
Energy is transferred to surgearrester and networks (stray)
capacitance (voltage is restored)
Power electronicsthyristor type
Power transistor
Main branch Permanent current
Verylow losses
Temporisation branch Current in this branch
untilultra-fastdisconnector is open
Arming branch To risequickly thevoltage
opposed to source
Extinguishing branch Surgearrester to absorb
networkenergy
Ultra-fastdisconnector
Surgearrester
CapacitorPower electronics
thyristor type
Surgearrester
Surgearrester
~0v
Ultra-fastdisconnector
Power transistor
Power electronicsthyristor type
Power electronicsthyristor type
Surgearrester
Capacitor
Surgearrester
~0v
Ultra-fastdisconnector
Powertransistor
Powerelectronicsthyristortype
Powerelectronicsthyristortype
Surgearrest
Capacitor
15
10
5
0
-5
15
10
5
0
-5
Surgearrester
few kV 163kV
Ultra-fastdisconnector
Powertransistor
Powerelectronicsthyristortype
Powerelectronicsthyristortype
Surgearrester
Capacitor
Current (kA)
ArmingbranchTranscientIn terruption
Voltage(TIV)
Ultra-fastdisconnector
Powertransistor
Powerelectronicsthyristortype
Powerelectronicsthyristortype
Surgearrest
Capacitor
Surgearrester