Alstom MiCOM P846, Техническое руководство

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Measurements and Recording P846/EN MR/D
MiCOM P846
(MR) 8-5
MR
Alarm Condition Event Text Event Value
Battery Fail Battery Fail ON/OFF Bit position 0 in 32 bit field
Field Voltage Fail Field Volt Fail ON/OFF Bit position 1 in 32 bit field
Setting Group via Opto
Invalid
Setting Grp. Invalid ON/OFF Bit position 2 in 32 bit field
Protection Disabled Prot’n. Disabled ON/OFF Bit position 3 in 32 bit field
Frequency out of Range Freq. out of Range ON/OFF Bit position 4 in 32 bit field
VTS Alarm VT Fail Alarm ON/OFF Bit position 5 in 32 bit field
CB Trip Fail Protection CB Fail ON/OFF Bit position 7 in 32 bit field
The previous table shows the abbreviated description that is given to the various alarm
conditions and also a corresponding value between 0 and 31. This value is appended to
each alarm event in a similar way as for the input and output events previously described. It
is used by the event extraction software, such as MiCOM S1, to identify the alarm and is
therefore invisible if the event is viewed on the LCD. Either ON or OFF is shown after the
description to signify whether the particular condition has become operated or has reset.
1.2.1.4 Protection element starts and trips
Any operation of protection elements, (either a start or a trip condition) will be logged as an
event record, consisting of a text string indicating the operated element and an event value.
Again, this value is intended for use by the event extraction software, such as MiCOM S1,
rather than for the user, and is therefore invisible when the event is viewed on the LCD.
1.2.1.5 General events
A number of events come under the heading of ‘General Events’ - an example is shown
below:
Nature of Event
Displayed Text in Event
Record
Displayed Value
Level 1 password modified,
either from user interface,
front or rear port.
PW1 modified UI, F, R or R2 0 UI=6, F=11, R=16, R2=38
A complete list of the ‘General Events’ is given in the Relay Menu Database (P846/EN MD),
which is a separate document, available for downloaded from our website.
1.2.1.6 Fault records
Each time a fault record is generated, an event is also created. The event simply states that
a fault record was generated, with a corresponding time stamp.
Note that viewing of the actual fault record is carried out in the "Select Fault’" cell further
down the "VIEW RECORDS" column, which is selectable from up to 5 records. These
records consist of fault flags, fault location, fault measurements etc. Also note that the time
stamp given in the fault record itself will be more accurate than the corresponding stamp
given in the event record as the event is logged some time after the actual fault record is
generated.
The fault record is triggered from the ‘Fault REC. TRIG.’ signal assigned in the default
programmable scheme logic to the ‘Fault Detected’ DDB. Note the fault measurements in
the fault record are given at the time of the protection start. Also, the fault recorder does not
stop recording until the trip condition resets in order to record all the protection flags during
the fault.
It is recommended that the triggering contact (relay 3 for example) be ‘self reset’ and not
latching. If a latching contact were chosen the fault record would not be generated until the
contact had fully reset.