CHAPTER 6: SETPOINTS
S5 INPUTS/OUTPUTS
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–131
will remain operational until the requested change of breaker state is confirmed by a
breaker auxiliary contact and the initiating condition has reset.
•
If the initiating feature resets, but the breaker does not change state, the output relay
will be reset after a default interval of 2 seconds.
•
If neither of the breaker auxiliary contacts, 52a nor 52b, is programmed to a contact
input, the Trip Relay is de-energized after either the delay programmed in the Breaker
Failure feature, or a default interval of 100 ms after the initiating input resets.
•
If a delay is programmed for the Trip contact seal-in time, then this delay is added to
the reset time. Note that the default setting for the seal-in time is 40 ms.
Output Relay 1 - W1
breaker "Trip"
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to
Chapter 3 - Working with the Keypad
.
PATH
:
SETPOINTS > S5 INPUTS/OUTPUTS > OUTPUT RELAYS > RLY 1 W1 BKRTRIP
RLY1 SEAL-IN
Range: 0.00 to 9.99 s in steps of 0.01
Default: 0.04 s
This setting defines the time to be added to the reset time of the Relay 1 Trip output, thus
extending its pulse width. This is useful for those applications where the 52 contacts
reporting the breaker state are faster than the 52 contacts that are responsible for
interrupting the coil current.
BLOCK RLY 1 TRIP
Range: Disabled, Contact Input 1 to 10, Virtual Input 1 to 32, Remote Input 1 to 32, Logic
Elements 1 to 16
Default: Disabled
This setting defines a block to the Trip Output relay. When the selected input is asserted,
the Trip Output relay will be blocked.
Output Relay 2 - W2
breaker "Trip"
PATH
:
SETPOINTS > S5 INPUTS/OUTPUTS > OUTPUT RELAYS > RLY 2 W2 BKRTRIP
RLY2 SEAL-IN
Range: 0.00 to 9.99 s in steps of 0.01
Default: 0.04 s
This setting defines the time to be added to the reset time of the Relay 2 Trip output, thus
extending its pulse width. This is useful for those applications where the 52 contacts
reporting the breaker state are faster than the 52 contacts that are responsible for
interrupting the coil current.
52a Contact
Configured
52b Contact
Configured
Relay Operation
Yes
Yes
Trip Relay remains operational until 52b indicates an
open breaker.
Yes
No
Trip Relay remains operational until 52a indicates an
open breaker.
No
Yes
Trip Relay remains operational until 52b indicates an
open breaker.
No
No
Trip Relay operates until either the Breaker Failure delay
expires (if the Breaker Failure element is enabled), or 100
ms after the feature causing the trip resets.
