order to schedule the close command properly. Function monitors both circuit
breaker opening and closing times and issues alarm in case opening or closing time
is too long. Added to this the closing time difference is also monitored and an alarm
is given incase circuit breaker closing time differs too much between closings.
Circuit
breaker
monitoring
POSOPN_CB1
POSCLS_CB1
POSOPN_CB2
POSCLS_CB2
OPEN_CB1
(from Bus transfer)
CLOSE_CB1
(from Bus transfer))
OPEN_CB2
(from Bus transfer))
CLOSE_CB2
(from Bus transfer)
I3P1
I3P2
F1_I_A
F1_I_B
F1_I_C
F2_I_A
F2_I_B
F2_I_C
AL_OPN_CB1
AL_OPN_CB2
AL_CLS_CB1
AL_CLS_CB2
Figure 948: Circuit breaker monitoring module diagram
Circuit breaker monitoring can operate in several modes. Operation mode is set
with setting
Travel time Clc mode. Supported calculation modes are shown in
.
Table 1604: Supported traveling time measurement modes
Setting values
Description
From Cmd to Pos
Traveling time is measured from command to
position change
From Pos to Pos
Traveling time is measured from position
change to position change
From Cmd to Curr
Traveling time is measured from command
till current is measured to flow through cir-
cuit breaker
From Pos to Curr
Traveling time is measured from position
change till current is measured to flow
through circuit breaker
Circuit breaker opening and closing times are defined with following settings:
Closing time CB1, Closing time CB2, Opening time CB1 and Opening time CB2.
Measured closing and opening times can be taken into use via control menu by
activating parameter Set travel times.
Reset travel times set the travelling times back to set values.
Control functions
1MRS759142 F
1782
REX640
Technical Manual