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Modification of dump resistors for dipoles, DQRMB

Modification of dump resistors for dipoles, DQRMB. Aim of modification Way of modification Advantage of modification. Marek Ciechanowski AGH, Poland. Aim of modification. Two banks of resistors, 3 resistors in each bank connected in parallel

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Modification of dump resistors for dipoles, DQRMB

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  1. Modification of dump resistors for dipoles, DQRMB • Aim of modification • Way of modification • Advantage of modification Marek Ciechanowski AGH, Poland

  2. Aim of modification • Two banks of resistors, 3 resistors in each bank connected in parallel • 78 horizontal plates connected in series form one resistor which gives 225 mΩ of resistance • When switch on the one side will not commute, only one bank of resistor must absorb the all energy of the dipoles (1.3 GJ ) • temperature of one resistor may increase up to 466oC (over 150o nominal) • overheating of resistor will cause the thermal expansion (α = 12·10-6/K) of the plates up to 40mm • The plates will push the insulating board which separate the resistor plates from the bus bar connection • breakage the insulating plate and direct contact between bus bars and resistor plates • damage of the resistor

  3. Way of modification

  4. Sometimes access to the resistor was easy, sometimes not Modification are done in all dump resistors in the LHC tunnel and in 3 spare resistors in the Bldg 388 also.

  5. Advantages • Increase free space between locking washer and insulation plate • Eliminate sharp edge of fixing screw • Decrease the risk of damage the resistor in a case of switch fault

  6. Connectors and sockets check Marek CiechanowskiAGH, Poland

  7. During maintenance two possible fault sources were found • Not tightened screws in electronic cabinets and racks • Broken or bad fixed pins in connector or socket

  8. Broken cable insulation

  9. Results of check • The ~2250 cables and corresponding sockets were checked • It gives near 51 000 pins checked • 67cables/socket with errors/problems were found • inspection is documented in MS excel file • Each xls worksheet contains data for one alcove/system • The most errorshavebeenfound in UA63 and UA67

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