OUTLINE :

1
OUTLINE -
HIGH VOLTAGE TESTING

• GAS FLUSHING
• GAS LEAK DETECTION
• HV INSULATION TEST
• HV DEBUGGING
• RESULTS

• OUR TEAM
• RENU DUTTA
• SATISH SHARMA
• ANITA MAHAJAN
• NAVNEET KUMAR
• LOKESH KUMAR

2
OUTLINE -
HIGH VOLTAGE TESTING

• GAS FLUSHING
• LEAK DETECTION
• HV INSULATION TEST
• HV DEBUGGING
• RESULTS

• OUR TEAM
• RENU DUTTA
• SATISH SHARMA
• ANITA MAHAJAN
• NAVNEET KUMAR
• LOKESH KUMAR

3
GAS FLUSHING

• Gas is allowed to flush through the module for
  minimum 1-2 hrs. before taking any observation.
• Two nozzles are there
• -gt one for inflow
• -gt other for outflow.
• Gases Used
• Ar CO2 (7030)
• Gas Flow can be observed through bubbler

Gas InFlow
Gas Outflow
4
GAS LEAK DETECTION

• After Flushing, Module is tested for gas
  leakage by
• using leak detector .
• Value of Gas leakage in the leak detector
• greater than 10 3 ml / s Specify some
  leakage in the
• module.
• Leakage is blocked by applying araldite at the
  leakage
• point.
• The module is kept for minimum 12 hours after
  
• applying araldite.
• Then we again see that whether there is any
  leakage point left?

5
HV INSULATION TEST

• HV Insulation test is done to look for any
  boundary current leakage .
• High voltage ( 1800 V ) is applied to module
  for at least two to three days
• This will minimize the boundary leakage current
  .
• This is called seasoning of module.

6
BAD CHANNEL DEBUGGING

• High Voltage is applied to module current
  leakage is checked.
• For any current Leakage of the order of gt 0.5
  µA , debugging is to be done.
• Steps for Debugging -
• Chain Isolation.
• Zone Isolation .
• Single channel Isolation

7

• How to Debug a Bad Channel ?
• For any current leakage, Firstly we look for Bad
  Chain.
• Secondly for Bad Zone then
• Finally for Bad Channel .

HV box
DIP switch with long Hv connectors
DIP switch With Kapton cable
DIP switch With zone shorting Strip PCB
Dip Switch
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Step-1 DIP switch with long HV connectors
Spark monitor
Opto-coupler Based scaler
Step-3 DIP switch With Kapton cable
DIP switch
Step-2 DIP switch With zone shorting Strip PCB
HV debugging Step-1 chain isolation Step-2 zone
isolation Step-3 single channel isolation
1M
Leakage Current monitor
9

• Scheme For Addressing the Zones the Channels
  in a Module-

1. Addressing a Zone (Connector)

• Two types of modules -
• Long Type (A type)
• Short Type ( B type)

C3 R 4
C3 R 2
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2. ADDRESSING THE CHANNELS IN A CONNECTOR
C1
C2
C3
C4
c 2 r 3
c 2 r 3
C3 R 4

• Complete Address of a bad channel -

• Bad Channels ( Isolated ) Found in Module 2
  -
• S.no. Connector Channel
• 1. C4R3 c3r5
• 2. C6R11 c3r7

• In Connector C8R12 Bad channel is yet to be
  detected .

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RESULTS OF HV TESTING
Mean Value 105
Mean Value 44
Mean Value 33
Mean Value 18
12
Horizontal
Mean Value 17
Day 1
Vertical
Day 2
Day 1
Day 2
Vertical ( After Spray)
13
Mean Value 2
Mean Value 1

• Conclusion -
• Number of Sparks decreases with Time.
• At 1300 V No Spark was Found .

14
THANKS