electrical discharge circuit for cngs horn & reflector ph/dt1 group meeting, 23 october 2007...

Electrical Discharge CircuitElectrical Discharge Circuitfor CNGS Horn & Reflectorfor CNGS Horn & Reflector

PH/DT1 PH/DT1 Group Meeting, 23 October 2007Group Meeting, 23 October 2007

Gilles MAIRE PH/DT1-ICGilles MAIRE PH/DT1-ICSection LeaderSection Leader

PhysicsPhysics

At CERN• Protons extracted in point 4 of SPS.• Pions & Kaons after Target.• Muons Neutrinos after Decay Tunnel.

At Gran Sasso• Opera Detector.

PH/DT1 Group Meeting, 23 October2007 by Gilles MAIRE PH/DT1-IC 1

Horn and ReflectorHorn and Reflector


IntroductionIntroductionHorn and Reflector (Load)Horn and Reflector (Load)

•7 m long (approx.)

• 1.6 tonne (approx.)

50ms t

I Every 6s



Horn PictureHorn Picture

Electrical CircuitElectrical Circuit

Pulse 1

Pulse 2

Delay 50msStart

ChargingStop

Charging

ThyristorsBridge

TR

DiodesBridge Capa

Capa

ThyristorsDischarge

ThyristorsDischarge

DischargeCircuit 1

DischargeCircuit 2

Charging Unit10kV - 20A

Pol

arity

Cha

nger

Ear

thin

g

HORNTR

Experimental Area

PowerCables

(~1000m)

I

t


Unit HORN System REFLECTOR System

Load Peak current kA 150 180

Transformer ratio 16 32

Primary current peak A 9375 5625

Load inductance µH 2,7 X 16 X 16 = 691 1,5 X 32 X 32 = 1540

Total inductance with 4 cables µH 1210 2046

Load resistance m 0,6 X 16 X 16 = 154 0,21 X 32 X 32 = 215

Total resistance with 4 cables m 328 495

Total capacitance for one pulse µF 4080 4080

Pulse duration ms 7,5 10

Charging voltage V 7700 6300

Total stored energy kJ 2 X 119 = 238 2 X 80 = 160

Load max. voltage V 280 150

Mean power dissipated by current only (2 pulses) kW 16 10,5

Total power dissipated (with beam) kW 26 16,5

Water flow for delta T=5C l/min 70 70

Pressure bar 1,2 1,2

Electrical ParametersElectrical Parameters


HV Capa.

Th. Disch.

TR. Pulse

General ViewGeneral View

Horn and ReflectorIn Target Chamber

ChargingPower Supply in surface

Power cables (~1000m) along Access Galleries

Pulse TransformerIn Service GalleryStrip Lines

from Transformers to Horn & Reflector


Layout in BHA4Layout in BHA4

3

R2 CAPACITOR BANK

1142

Ø800

MA

IN D

OO

R: 6

60SUI8

BB4

INSTALLATION LAYOUT PROPOSITION IN BHA4 FOR CNGS HORNS POWER SYSTEMS AND CONTROLS

S. Rangod07/10/2003

R1 CAPACITOR BANKS

Dimensions in cm

BHA4

CH

AR

GIN

G S

UP

PLY

R1

Dischargecircuit 2-1

CH

AR

GIN

G S

UP

PLY

R2

Existing ventilation unit

Reserved space for UPS

Reserved space for UPS

Recup 2-1Capacitor cabinet R2-1/1

Capacitor cabinet R2-2/1





Recup 2-2 Dischargecircuit 2-2

Recup 1-1

Recup 1-2



Capacitor cabinet R1-3/1Capacitor cabinet R1-3/2





80

85

115

7207979

CO

NT

RO

LS6

66

(to

be

ch

eck

ed)

Ground + Polarity

Ground + Polarity (No false floor)

8018032323

80

1365

5315

80

12060

60 8012

016

0

100

360

390

2 hours fire-resistant walls (height: 3 m)

2 hours fire-resistant doors (nb: 4)

Electrical box to be shifted 20 cm


Cross section in undergroundCross section in underground

4th NBI, 7 - 11 November 2003 at KEK by Gilles MAIRE 9

TransformerLoad

Charging Power SupplyCharging Power Supply

Old ElectronicNew Electronic AB/PO Group

24U

6U



Need to increase charging voltage to 10kV.• Buy new transformer (LV/HV), call for tender for 3 units for a cost of

30kchf.



Old

New

New HV Rectifier Diode• Need to increase charging

voltage. • Call for tender for 30 unitsfor a cost of 30kchf.


Results• Space saving. Number of

diodes divided by 2.

Capacitors DischargeCapacitors Discharge

Rack with New capacitors

New capacitors• 12 racks with a total of 48 capacitors.• Call for tender for a cost of 350kchf.

Results• Space saving. Number of racks divided by 3.• Important cost saving (300kchf) for

infrastructure and cabling.

Rack with WANF capacitors


Discharge CircuitDischarge Circuit

Old

New

New Inductance• Call for tender for 12 unitsfor a cost of 40kchf.


Results• Space saving. Number of

inductance divided by 6.

Thyristor Switches (20kV, 18kA)Thyristor Switches (20kV, 18kA)

New Th. Discharge•All Th. Switches needed have been bought and delivered by ARCEL (FR).• 6 units for 150 kchf.• 3 thyristors in series, sharing resistor, RC snubber and impulse transformer.


Pulse TransformersPulse Transformers

Pulse Transformer • Reusing WANF Transformers ratio 32. • Adaptation ratio 16 for Horn.• Cost saving 450kchf.

Ratio 16


18kV Power Cables18kV Power Cables

Power cables• Call for tender for 6 X 1km (4X95mm2), have been bought and delivered by PIRELLI. Cost of 350kchf.• 80kchf for laying.


Connection in BHA4 Junction in ECA4

Connection in TSG

Electrical & Continuity Test 20th January 2006

18kV Power Cables18kV Power CablesConnectionConnection


ControlControl

Designed by Sylvain RAVAT EP/TA3

latigid

PVSS Supervisorin BHA4

DISCHARGE CIRCUIT

POWER CONVERTER


Control Room supervision

VME, TG8,MIL1553, G64

POW protocol - CMWUNICOSCESARLoggingAlarms

Horn’s interlocks

Interlocks

Ethernet Network

EARTH & POLARITY

Interlocks

REMOTE I/O

FIPBus

Surface BHA4 Underground


Control in Surface (BHA4)Control in Surface (BHA4)

PLC Rack in BHA4

Schneider Unity. UNICOS. Programming Process. Hardware interlocks.


Control in UndergroundControl in Underground

Remote I/O in TSG Instrumentation of Cooling Unit in TSG

FIP I/O and conditioning signal. Cooling Unit.


PVSS Electrical ViewPVSS Electrical View



PVSS Hydraulic ViewPVSS Hydraulic View



Hydraulic ViewHydraulic View


Trending. Historical. Alarm.


Commissioning in May 2006 Commissioning in May 2006


50ms

150kA

180kA

50msDouble pulse for Horn. Time pulse of 6,5ms conform with simulation

Double pulse for Reflector. Time pulse of 10ms conform with simulation


electrical discharge circuit for cngs horn & reflector ph/dt1 group meeting, 23 october 2007...

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important cost