Thytronic NC20 - Page 134

134
134
NC2 0 - Manual - 01 - 2015
MEASURES, LOGIC STATES AND COUNTERS
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
N
, u
L1
, u
L2
, u
L3
Analog measures: I
L1
, I
L2
, I
L3
, I
L1RMS
, I
L2RMS
, I
L3RMS
, I
N
Logic variables: K1, K2, K3, K4, K5, K6, IN1, IN2
up to 116 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:
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N = int
(34 + 20 v
i
+ 4 v
RMS
+ n
B
)·
12000
(t
pre
+ t
post
)(s)
·
f (Hz)
50 (Hz)
N = int
(34 + 20 v
i
+ 4 v
RMS
+ n
B
)·
12000
(t
pre
+ t
post
)(s)
·
f (Hz)
50 (Hz)
= 116
(34 + 20 · 7 + 7 · 4 + 2) · (0.25 + 0.25)
N = int
12000
·
50 (Hz)
50 (Hz)
= 116
(34 + 20 · 7 + 7 · 4 + 2) · (0.25 + 0.25)
N = int
12000
·
50 (Hz)
50 (Hz)
= 42
(34 + 20 · 8 + 9 · 4 + 2) · (0.50 + 0.50)
N = int
12000
·
50 (Hz)
60 (Hz)
= 42
(34 + 20 · 8 + 9 · 4 + 2) · (0.50 + 0.50)
N = int
12000
·
50 (Hz)
60 (Hz)
thysetter37a.ai
Phase/to/phase fault record