Alstom MiCOM P846, Техническое руководство

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P846/EN MR/D Measurements and Recording
(MR) 8-8
MiCOM P846
MR
1.3
er has an area of memory specifically set aside for record
torag be stored by the relay is dependent upon the
selected recording duration. The relay can typically store a minimum of 50 records, each of
.5 se wever, have the same total record length but the
f 3 seconds duration) can be extracted via the
be recorded until the available memory is
xhau rd(s) are overwritten to make space for the newest
s per cycle at a rate
60 Hz (1920 samples/second) and 40 samples per cycle for
t analog data channels and thirty-two digital data
hann os for the analog channels are also extracted to
nable if a CT ratio is set less than unity, the relay
riate channel.
The "DISTURBANCE RE following table:
Disturbance recorder
The integral disturbance record
s
e. The number of records that may
1 conds duration. VDEW relays, ho
VDEW protocol dictates that only 8 records (o
rear port. Disturbance records continue to
e
sted, at which time the oldest reco
one.
The recorder stores actual samples that are taken at a rate of 24 sample
of 32 samples per cycle for the
the 50 Hz (2000 samples per second).
Each disturbance record consists of eigh
c
els. The relevant CT and VT rati
e scaling to primary quantities. Note that
will choose a scaling factor of zero for the approp
CORDER" menu column is shown in the
Setting Range
Menu Text Default Setting Step Siz
Min. Max.
e
DISTURB. RECORDER
Duration 1.5s 0.1s 10.5s 0.01s
This sets the overall recording time.
Trigger Position 33.3% 0 100% 0.1%
This sets the trigger point as a percentage of the duration. For example, the default
settings show that th
33.3% of this, giving 0
e overall recording time is set to 1.5s with the trigger point being at
.5s pre-fault and 1s post fault recording times.
Trigger Mode Single Single or Extended
If set to single mode a recording is taking place, the
recorder will st
re
, if a further trigger occurs whilst
ignore the t
trigger timer will be
rigger. However, if this has been set to "Extended", the po
set to zero, thereby extending the recording time.
Analog. Channel 1 IA IA, IB, IC, VA, VB, VC, IA2, IB2, IC2
Selects any available nnel. analog input to be assigned to this cha
Analog. Channel 2 IB As above
Analog. Channel 3 IC As above
Analog. Channel 4 IN As above
Analog. Channel 5 VA As above
Analog. Channel 6 VB As above
Analog. Channel 7 VC As above
Analog. Channel 8
Ι
N2
As above
Digital Inputs 1 to 24
Relays 1 to 24 and
Opto’s 1 to 32 Any of 32 O/P Contacts or Any of 24 Opto
Inputs or Internal Digital Signals
The digital channels may be mapped to any of the opto isolated inputs or output contacts,
in addition to a number of internal relay digital signals, such as protection starts, LEDs etc.