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NV10P - Manual - 01 - 2015
MEASURES, LOGIC STATES AND COUNTERS
Analog channels
Frequency f
UL1
, f
UL12
, f
UL13
Fundamental component for input phase voltages U
L1
, U
L2
, U
L3
Fundamental component for input phase-to-phase voltages U
12
, U
23
, U
31
Fundamental component for measured residual voltage U
E
Fundamental component for calculated residual voltage U
EC
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.
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: 0.25 s
Post-trigger: 0.25 s
Sampled measures: u
L1
, u
L2
, u
L3
, u
E
Analog measures: U
L1
, U
L2
, U
L3
, U
E
Logic variables: K1, K2, K3, K4, K5, K6, IN1, IN2
180 record can be stored if f = 50 Hz
Example 2
With following setting:
Pre-trigger: 0.25 s
Post-trigger: 02.5 s
Sampled data: u
L1
, u
L2
, u
L3
, u
E
Analog measures: U
L1
, U
L2
, U
L3
, U
E
Digital channels: K1, K2, K3, K4, K5, K6, IN1, IN2
up to 150 records can be stored if f = 60 Hz
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N = int
(
34 + 20 v
i
+ 4 v
RMS
+ n
B
)·(t
pre
+ t
post
)
12000
·
f (Hz)
50 (Hz)
N = int
(34 + 20 v
i
+ 4 v
RMS
+ n
B
)·(t
pre
+ t
post
)
12000
·
f (Hz)
50 (Hz)