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Bulk Resistivity measurement of Phenolic

Bulk Resistivity measurement of Phenolic. Liang Guan. >> Method >> New measurement on Sample Batch4-T1. 06/06/2011 Bi-weekly TGRPC R&D Meeting . Bulk Resistivity measurement-Method (1) . GND. 9(3×3)/25(5×5) points sampling . pA. Electrode A ( ø=5cm). 12. 15. 13. 14. 11. 25.

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Bulk Resistivity measurement of Phenolic

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  1. Bulk Resistivity measurement of Phenolic Liang Guan >> Method >> New measurement on Sample Batch4-T1 06/06/2011Bi-weekly TGRPC R&D Meeting

  2. Bulk Resistivity measurement-Method (1) GND • 9(3×3)/25(5×5) points sampling pA Electrode A (ø=5cm) 12 15 13 14 11 25 23 24 22 21 3atm Pressure is applied (CMS) 32 35 33 34 31 41 42 45 43 44 55 53 54 51 52 Specimen (Size: 40cm*40cm Thickness:1mm) Conductive rubber (thickness: 0.5-1mm) * rubber filled with small conductive metal or carbon spheres Electrode B (ø=8cm) +500V 1

  3. Bulk Resistivity measurement-Method (1) 高压（高压电缆中心线） 高压电源 高压电缆 1kΩ,10kΩ,100kΩ,1MΩ 地线 （高压电缆外包皮） 数字万用表（电压模式） 2

  4. Bulk Resistivity measurement-Method (3) • Assume Effective area • Sample bulk resistivity on the order of 108Ω·cm/109Ω·cmand thickness of 1 mm • For HV=500V, current flowing through sample ~1000μA/100μA V Multi-meter • Voltage scale on Rt Rs Rt 500V 3

  5. Logbook • Specify the sample ID, charging time, RH, Temperature etc. Preliminary 4

  6. Bulk resistivity of Batch 4-T1 sample >116hours 5

  7. Bulk resistivity of Batch 4-T1 sample • Measured resistivity is on the order of 109 Ohm.cm at Room temperature  similar to the value measured 2 weeks ago but still a factor of two higher than the value measured 2 months ago when the sample just arrived. • Bulk resistivity value of the sample Batch4-T1 shows some correlation with the temperature • lower temperature results in higher resistivity • resistivity value @ ~25C slightly increasing during one week test (RH<40%)

  8. Material study - Prof. Changguo Lu’s study • Surface condition: defects such as pins, hole, ridge etc. present on the inner surface of Bakelite will make shape electric field thus increasing the noise rate • UV absorption • Ageing: HF acid chemical active ATLAS RPC C4H10 5% SF6 0.3% C2H2F2 94.7% CMS RPC C4H10 3.5% SF6 0.3% C2H2F2 96.2% • Significantly reduce resistivity • surface smoothness - Water : Help to slow down the decrease of resistivity but also help to form HF

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