GE P4A Technical Manual page 724

Appendix B - Settings and Signals
MENU TEXT
Comm Fail Timer
Time delay after which the 'Channel Fail Alarm' will be issued providing that no messages were received during the 'Channel Timeout' period
or the 'Alarm Level' is exceeded.
Comm Fail Mode
Fail mode setting that triggers the 'Channel Fail Alarm', providing that the Dual Redundancy or 3 ended scheme is set.
Normally the alarm would be raised for any loss of an operational channel (logical OR combination). However, when IED's in a 3 ended
scheme are deliberately operated in Chain topology AND logic may be used, for indication when the scheme becomes finally inoperative,
with no self-healing (signal rerouting) mode possible.
Char Mod Time
Time delay during which the setting characteristic k1 is increased to 200% after the difference between 2 successive calculated propagation
delay time exceed the time delay setting Comm Delay Tol. This should be set to greater than the maximum switching delay expected.
Char Mod Reset
Setting to enable Char Mod Ex Time.
Char Mod RstTime
If the Char Mod Time has started then the Char Mod Ex Timer runs. If at the end of this timer and until Char Mod Time has expired, the bias
current is above 5% In, and differential current is below 10% of bias current on all phases, then the Char Mod Time will reset and the
characteristic will return to normal. If these conditions are not met, then the characteristic remains increased for the duration of the Char
Mod Time. Char Mod Ex Timer should be set greater than the minimum switching delay expected, and less than Char Mod Time.
Comm Delay Tol
If the difference between 2 successive calculated propagation times exceed this time delay setting, then the IED will initiate a change in IED
setting for a short time period ("Char Mod Time" setting) and will raise a Comm Delay Alarm.
Channel Timeout
A rolling time window beyond which any of the 8 IM signals that are set to 'Default' will be replaced by the corresponding 'IM_X Default
Value' setting, providing that no valid message is received on that channel in the meantime. The 'Chnl Fail Alarm' timer will be also initiated.
If only one channel is used, each out of 16 IM signals available that is set to 'Default' will convert to corresponding 'IM_X Default Value'
If a Dual redundant or 3 ended scheme is selected, each out of 8 IM signals available that is set to 'Default' will convert to corresponding
'IM_X Default Value', but only for the affected channel.
Prop Delay Stats
To enable (activate) or disable (turn off) the alarms of Maximum propagation delay time
MaxCh1 PropDelay
When the protection communications are enabled, the overall propagation delay divided by 2 is calculated and the maximum value is
determined and displayed in Measurements 4 column. This value is displayed and compared against this setting. If the setting is exceeded,
an alarm MaxCh1 PropDelay (DDB 1386) is raised.
MaxCh2 PropDelay
When the protection communications are enabled, the overall propagation delay divided by 2 is calculated and the maximum value is
determined and displayed in Measurements 4 column. This value is displayed and compared against this setting. If the setting is exceeded,
an alarm MaxCh2 PropDelay (DDB 1387) is raised.
Re-Configuration
This setting is to remove or restore one relay from the scheme.
The setting is invisible when 2 Terminal Scheme Setup is selected.
B158
COL ROW DEFAULT SETTING
20 76 10
20 77 Ch 1 or 2 Fail
20 78 0.5
20 79 Disabled
20 7A 0.5
20 7B 0.00035
20 7C 0.1
20 7D Enabled
20 7E 0.015
20 7F 0.015
20 80 Disabled
DESCRIPTION
From 0.1 to 600 in steps of 0.1s
[Courier Number (time-seconds)]
Ch 1 Failure
Ch 2 Failure
Ch 1 or 2 Fail
Ch 1 and 2 Fail
[Indexed String]
From 0 to 30 in steps of 0.0001
[Courier Number (time-seconds)]
Disabled
Enabled
[Indexed String]
From 0 to 30s in steps of 0.0001s
[Courier Number (time-seconds)]
From 0.00025s to 0.001s in steps of 0.00005s
[Courier Number (time-seconds)]
From 0.1s to 10 in steps of 0.1s
[Courier Number (time-seconds)]
Disabled
Enabled
[Indexed String]
From 0.001s to 0.05 in steps of 0.001
[Courier Number (time-seconds)]
From 0.001 to 0.05 in steps of 0.001
[Courier Number (time-seconds)]
A
B
C
D
E
F
[Indexed String]
P54A/B/C/E
AVAILABLE OPTIONS
P54xMED-TM-EN-1