Thytronic NA11, Manual

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95 NA11 - Manual - 02 - 2009 MEASURES, LOGIC STATES AND COUNTERS
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 RAM
[1]
to clear memory for new
records
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 is depending on settings of following parameters:
Pre-trigger and post-trigger times
Number of allocated channels.
By means of the following formula the record quantity may be evaluated:
where:
N : record quantity
v
i
: sampled measures
v
RMS
: analog measures (RMS)
n
B
: logic variables
t
pre
: pre-trigger time interval
t
post
: post-trigger time interval
f : frequency
Example 1
With the following setting:
Pre-trigger: 0.2 s
Post-trigger: 0.1 s
Sampled measures: i
L1
, i
L2
, i
L3
, i
E
Analog measures: I
L1
, I
L2
, I
L3
, I
E
Logic variables: K1, K2, K3, K4, K5, K6, IN1, IN2
819 record can be stored if f = 50 Hz, since:
Example 2
With following setting:
Pre-trigger: 0.5 s
Post-trigger: 0.5 s
Sampled data: i
L1
, i
L2
, i
L3
, i
E
Analog channels: I
L1
, I
L2
, I
L3
, I
E
Digital channels: K1, K2, K3, K4, K5, K6, IN1, IN2
up to 204 records can be stored if f = 60 Hz, since:
Note 1 Data are stored into volatile memory RAM, they are lost when power goes down
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trigger.ai
Trigger oscillografia
Trigger
Time
pre-trigger post-trigger
trigger.ai
Trigger oscillografia
Trigger
Time
pre-trigger post-trigger
N = int ·
24 + 24 v
i
+ 4 v
RMS
+ n
B
600
( t
pre
+ t
post
)(s)
59 s
·
f (Hz)
50 (Hz)
N = int ·
24 + 24 v
i
+ 4 v
RMS
+ n
B
600
( t
pre
+ t
post
)(s)
59 s
·
f (Hz)
50 (Hz)
N = int = 819 ·
24 + 24 · 4 + 4 · 4 + 8
600
(0.1 + 0.2 )(s)
59 s
·
50 (Hz)
50 (Hz)
N = int = 819 ·
24 + 24 · 4 + 4 · 4 + 8
600
(0.1 + 0.2 )(s)
59 s
·
50 (Hz)
50 (Hz)