Figure 123 - Control Circuit Monitoring Alarms; Figure 124 - Dc Voltage Default Settings; Figure 125 - Mean Coil Current Max Threshold Calculation - GE CSE Uniserve CB Watch 3 Operating Manual

Data obtained from CBW3
Coil circuit DC voltage source 1
Coil circuit DC voltage source 2
Mean coil current - Open 1, per pole
Mean coil current - Open 2, per pole
Mean coil current - Close, per pole
Coil actuation charge - Open 1, per pole
Coil actuation charge - Open 2, per pole
Coil actuation charge - Close, per pole
Coil continuity - Open 1, per pole
Coil continuity - Open 2, per pole
Coil continuity - Close, per pole
Threshold values
DC Voltage Supply
This depends on what acceptable level has been set as a policy or what minimum voltage is
required by the coils. Normally, low voltage tests are run during the CB FAT and the lowest
tested value could be used as the minimum alarm level. High level alarm is much less of a
concern and can be effectively de-activated by using a very high threshold like 500V.
If this function is not being monitored and no sensor is present, then the values should be
set as such to avoid any erroneous alarm:
HMI: Settings / Analogue channels
Mean coil current
Using historical data, we can determine the minimum and maximum values of the mean coil
current recorded. We can use them, as shown in the table below, to calculate the max
threshold for both opening and closing operation:
Nominal DC Voltage
Coil resistance
Max mean coil current
Figure 125 – Mean coil current max threshold calculation
MA-037 - CB Watch 3 Operating Manual
Figure 123 – Control circuit monitoring alarms
Figure 124 – DC voltage default settings
Opening
C
(A/C)x((100+p)/100)
v7.0 - May 2020
Thresholds
Min Alarm Max Alarm
Yes Yes
Yes Yes
No Yes
No Yes
No Yes
Yes Yes
Yes Yes
Yes Yes
Yes
Closing
A
D
(A/D)x((100+p)/100)
Alarms available
Digital Relay
Yes Yes
Yes Yes
Yes
Yes
Yes
Yes Yes
Yes
Yes
Yes
Yes Yes
Yes Yes
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