GEK-105593C
17
2.4. CONTROL
2.4.1. ASSOCIATED BREAKER COMMAND
Using a local interface (MMI) or using a personal computer connected to the serial port with the GE-LOCAL
communications software, it is possible to open or close the line breaker using the tripping or closing
contacts of the SMOR unit.
2.4.2. OPERATION FAILURE DETECTION
The SMOR unit detects breaker failure-to-open and also failure-to-close conditions.
When a closing command is issued, a timer starts. This timer can be set to a value for "MAXIMUM
CLOSURE TIME", programming it for the maximum time expected for the closing of the breaker. If this timer
produces an output (when time exceeds the setting) it issues an alarm which indicates that the breaker has
not closed in the expected time. If the breaker closes before this time, the timer is stopped by the opening of
a contact 52/b which is wired to the digital input associated with this function, and the alarm is not turned on.
If the contact 52/b is not wired to the SMOR system, no voltage is applied when the breaker is open (contact
52/b closed). In this case the timer does not start when the breaker closing signal is issued, and therefore the
failure-to-close detection function cannot operate.
As far as the failure-to-open detection is concerned, the SMOR unit is provided with a logic activated by the
OR of the trip of any of the internal protection units in which a trip is permitted and by the activation of a
failure-to-open input. Once the OR-A gate has been activated, the failure-to-open unit will act if the breaker
remains closed at the end of the time period set for "MAXIMUM OPENING TIME", or if any of the overcurrent
units of the SMOR are still picked up (outputs OR-B and OR-C). This arrangement corresponds to the
following logical diagram:
Breaker Failure-to-open function logic
52 Closed
OR A
AND A
OR B
OR C
O/C Pickup
T
Failure to
open
Trip
0.05-1
Breaker
failure to open
Summary of Contents for SMOR-B GEK 105593C
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Page 89: ...GEK 105593C 84 FIGURE 1 PANEL DRILLING DIMENSIONS FOR 19 RACK MODELS 226B6086H10 ...
Page 91: ...GEK 105593C 86 FIGURE 3 INVERSE CHARACTERISTIC OPERATING CURVE 226B7414H1 ...
Page 92: ...GEK 105593C 87 FIGURE 4 VERY INVERSE CHARACTERISTIC OPERATING CURVE 226B7414H2 ...
Page 93: ...GEK 105593C 88 FIGURE 5 EXTREMELY INVERSE CHARACTERISTIC OPERATING CURVE 226B7414H3 ...
Page 94: ...GEK 105593C 89 FIGURE 6 RECLOSER PROGRAM FLOWCHART 226B2200H1 ...
Page 95: ...GEK 105593C 90 FIGURE 7 FRONT VIEW FOR 19 RACK MODELS 226B7412H9 ...
Page 96: ...GEK 105593C 91 FIGURE 8 FRONT VIEW FOR 1 2 RACK MODELS ...
Page 97: ...GEK 105593C 92 FIGURE 9 EXTERNAL CONNECTIONS FOR 19 MODELS 189C4101H1 ...
Page 100: ...GEK 105593C 95 FIGURE 13 REAR VIEW FOR 19 MODELS 226B7412H10 ...
Page 102: ...GEK 105593C 97 FIGURE 15 DIMENSIONS DIAGRAM FOR 19 MODELS 226B6086H10 ...
