MEASURES, LOGIC STATES AND COUNTERS
81
NV021 - Manual - 08 - 2012
Frequency
f
r
Frequency rate of change
df
r
Inputs
Outputs
Fault cause info (eg. faulted phase)
Event recording - SER
Recording is triggered by one or more causes:
Start and/or trip of any enabled protection or control element
Binary input activation (OFF-ON or ON-OFF transition)
Power-on or power-down (Auxiliary power supply)
Setting change.
Three hundred events are recorded into a circular FIFO (First In, First Out) buffer.
[2][1]
Following information are stored in every record:
Event counter
[2]
Date and time
Event cause (binary input/element trip/setting change)
Oscillography - DFR
Upon programmable trigger, the fault records are recorded in COMTRADE format; the sampled mea-
sures (24 sample per cycle) are stored in a circular shift memory buffer.
The fault record are self-triggered; they are stored in sequential order up the allocated memory is
used up after which the oldest memory is overwritten.
An operating procedure example for the digital fault recording is illustrated inside the ThySetter
section.
Following parameters are user-programmable:
Pre-trigger and post-trigger time
Selected sampled quantities.
Analog channels (1...12) allocation.
Digital channels (1...12) allocation (output relay and/or binary inputs).
Trigger setup; the information storage starts when a state transition on the selected signal occurs.
(protective element start and/or trip, output relay and/or binary input switching).
Alarm: when the 80% of the buffer space is reached an alarm may be issued. The system being
of linear type, the records are back-to-back recorded to the end of available memory; the alarm
output is a warning in order that the user may download the data FLASH
[3]
to clear memory for
new records.
Following parameters are user-programmable:
Sample channels
Instantaneous value for input voltages
u
L1
,
u
L2
,
u
L3
Analog channels
Frequency
f
Fundamental component for input phase voltages
U
L1
,
U
L2
,
U
L3
Fundamental component for positive sequence voltage
U
1
Fundamental component for negative sequence voltage
U
2
Frequency rate of change
df
/
dt
Digital channels
Binary inputs
Output relays
COMTRADE
Records are recorded in COMTRADE format; (Common Format for Transient Data); This is a standard
for the data exchange for various types of tests or simulation datas, etc, for power system applica-
tions.
The measurements are recorded in ASCII or BINARY format. COMTRADE fi les always come by
pairs:
The “.CFG”-fi le describing the confi guration: number of analog and digital channels, sampling rate,
scale factors, etc.
The “.DAT”-fi le containing the data
The COMTRADE is part of IEC 60255-24 standard.
The recording can be analyzed by mean of ThySetter sw or any other standard compliant viewer.
The record quantity (max 400 records) is depending on settings of following parameters:
Pre-trigger and post-trigger times
Number of allocated channels.
Note 1 Event 0 is the newest event, while the Event 299 is the oldest event
Note 2 Counter is updated at any new record; it may be cleared by means ThySetter
Note 3 Data are stored into non volatile memory FLASH, they are preserved also when power goes down
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trigger.ai
Trigger oscillography
Trigger
Time
pre-trigger
post-trigger
trigger.ai
Trigger oscillography
Trigger
Time
pre-trigger
post-trigger
