Thytronic NA10 User Manual

MEASURES, LOGIC STATES AND COUNTERS
91
NA10 - Manual - 04 - 2022
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 ThyVisor sec-
tion.
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 data
[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 files always come
by pairs:
• The “.CFG”-file describing the configuration: number of analog and digital channels, sampling rate,
scale factors, etc.
• The “.DAT”-file containing the data
The COMTRADE is part of IEC 60255-24 standard.
The recording can be analyzed by mean of ThyVisor 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 (2 up to 16 variables)
• t
pre
pre-trigger time interval
• t
post
post-trigger time interval
• f frequency
Example 1
With the following setting:
• Pre-trigger: 0.25 s
• Post-trigger: 0.25 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
up to 180 record can be stored if f = 50 Hz, since:
Note 1 Data are stored into non-volatile memory; they are retained once power is turned off.
trigger.ai
Trigger oscillografia
Trigger
Time
pre-trigger post-trigger
N
= int
(34 + 20 v
i
+ 4 v
RMS
+ n
B
)·
12000
(t
pre
+ t
post
)(s)
·
f (Hz)
50 (Hz)
= 180
(34 + 20 · 4 + 4 · 4 + 2) · (0.25 + 0.25)
N
= int
12000
·
50 (Hz)
50 (Hz)

Thytronic NA10 Specifications

General

Brand	Thytronic
Model	NA10
Category	Relays
Language	English