GE P741, Technical Manual

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P74x/EN ST/Na7 Settings
(ST) 4-
42
MiCOM P741, P742, P743
ST
1.4.2 Peripheral Unit P742 or P743
Menu Text Default Setting
Setting Range
Step Size
Min. Max.
DISTURB. RECORDER
Duration 1.2 s 1.2 s 10.5 s 0.01 s
This sets the overall recording time. The relay can typically store up to 10.5 seconds until
the available memory is exhausted.
Trigger Position 33.3% 0.0% 100.0% 0.1%
This sets the trigger point as a percentage of the duration. For example, the default
settings show that the overall recording time is set to 1.2s with the trigger point being at
33.3% of this, giving 0.4 s pre-fault and 0.8 s post fault recording times.
Trigger Mode Extended Single or Extended
If set to single mode, if a further trigger occurs whilst a recording is taking place, the
recorder will ignore the trigger. However, if this has been set to "Extended", the post
trigger timer will be reset to zero, thereby extending the recording time.
Analog. Channel 1 I
A
Non settable
The Phase A analogue current input is assigned to this channel.
The following lines give the default settings for analog channels 2 to 4.
Menu Text Default Setting Explanation
Analog. Channel 2 I
B
Phase B analogue current input
Analog. Channel 3 I
C
Phase C analogue current input
Analog. Channel 4 I
N
Neutral analogue current input
Menu Text Default Setting
Setting Range
Step Size
Min. Max.
DISTURB. RECORDER
Digital Input 1 Field Volt Fail Any O/P Contacts or Any Opto Inputs or
Internal Digital Signals
The Mains field voltage has failed digital channel is assigned to this channel.
Input 1 trigger No Trigger No Trigger, Trigger L/H, Trigger H/L
No trigger: The digital channel will not trigger the Digital input 1.
Trigger L/H: The digital channel will trigger the disturbance recorder when changing from
‘0’ to ‘1’.
Trigger H/L: The digital channel will trigger the disturbance recorder when changing from
‘1’ to ‘0’.
The following lines give the default settings for “Digital inputs” 2 to 32 and “Input 2 to 32
triggers”. Setting choices for Input triggers are always “No Trigger”, “Trigger L/H” and
“Trigger H/L”.
Menu Text Default Setting Explanation
Digital input 2 Any Trip Any Trip digital channel
Input 2 trigger Trigger L/H