ISA CBA1000 - 2.8 Static Resistance Measurement (Optional); 2.9 Dynamic Resistance Measurement (Optional)

Doc. SIE10166 Rev. 10 Page 10 of 28
OPEN
CLOSE
TWO TIMES
OPEN 1
CONTACT 1
CONTACTS 2, 3
2.8 STATIC RESISTANCE MEASUREMENT (OPTIONAL)
This measurement is performed connecting CBA1000 to the test sample and measuring its
resistance. Test samples can be: joints, main contacts and so on. Main contacts resistance is
measured in the closed position.
. Test current, resistance measuring range, resolution and accuracy: see the table.
TEST
CURRENT
RESISTANCE
RANGE
RESOLUTION
ACCURACY
A
mOhm
μOhm
200
0.2
1
2 % of the reading ± 0.5% of the range
1
1
2 % of the reading ± 0.5% of the range
100
1
1
2 % of the reading ± 0.3% of the range
10
1
1 % of the reading ± 0.3% of the range
20
10
1
1 % of the reading ± 0.3% of the range
100
1
1 % of the reading ± 0.2% of the range
. Type of current source: electronic constant current generator, driven by a discharging capacitor.
. Minimum duration of the current generation: 30 ms, @ 200 A.
. Capacitor charging time: 60 s.
. Maximum test voltage: 18 V.
. Test mode selection. With single test, the resistance value is displayed. With Breaker phase test,
the screen shows a table that collects the measurement of all phases.
. NOTE: during the first 4 ms, the resistance measurement is affected by the connection leads
inductance.
2.9 DYNAMIC RESISTANCE MEASUREMENT (OPTIONAL)
With this measurement it is possible to record the main contact resistance during the CB close.
O DURATION
C DURATION
OC DELAY
CO DELAY
PAUSE
MONITORED D2
MONITORED D1
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