Functions
2.1 General
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
39
Command Duration
In address 240 the minimum trip command duration TMin TRIP CMD is set. It applies to all protection and
control functions that can initiate a trip command. It also determines the duration of the trip pulse when a circuit-
breaker trip test is initiated via the device. This parameter can only be set in DIGSI at Display Additional Set-
tings.
In address 241 the maximum close command duration TMax CLOSE CMD is set. This applies to all close com-
mands issued by the device. It also determines the length of the close command pulse when a circuit-breaker
test cycle is issued via the device. It must be long enough to ensure that the circuit breaker has securely closed.
An excessive duration causes no problem since the closing command is interrupted in the event that another
trip is initiated by a protection function. This parameter can only be set in DIGSI at Display Additional Set-
tings.
Circuit-Breaker Test
7SD80 allows a circuit-breaker test during operation using a trip-and-close command entered on the front panel
or from DIGSI. The duration of the trip command is set as explained above. Address 242 T-CBtest-dead
determines the duration from the end of the trip command until the start of the close command for this test. It
should not be less than 0.1 s.
Pickup Thresholds of the Binary Inputs (BI Thresholds)
At address 260 Threshold BI 1 to 266 Threshold BI 7 you can set the pickup thresholds of the binary
inputs of the device. The settings Thresh. BI 176V, Thresh. BI 88V or Thresh. BI 19V are possible
here.
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