CP SB1 User Manual
68
After a full maintenance of the tap selector, no significant difference to the values
measured at the factory in 1954 could be observed (see
Figure 5-11 "Resistance after maintenance").
Figure 5-11 Resistance after maintenance
To examine the results in more detail, it is recommended to graph the difference
between "UP" and "DOWN" values (see Figure 5-12 "Difference "UP" -
"DOWN""). The difference before contact maintenance was up to 30 mΩ = 5%
and after maintenance it was below 1 mΩ = 0.18%. Current maintenance
practices require values to be measured only for the middle and two extreme
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