Section 4
1MAC050144-MB C
Protection functions
162
615 series ANSI
Technical Manual
4.1.4.11
Technical data
Table 153: 51N/G, 50N/G-1/2 & 50N/G-3 Technical data
4.1.4.12
Technical revision history
Table 154: 50N/G-3 Technical revision history
Table 155: 50G-1/2 & 50N-1/2Technical revision history
Table 156: 51N/G Technical revision history
Pickup accuracy
Depending on the frequency of the current measured: f
n
±2Hz
51N/G
±1.5% of the set value or ±0.002 x I
n
50N-1/2 & 50G-1/2
and
50N/G-3
±1.5% of set value or ±0.002 x I
n
(at currents in the range of 0.1…10 x I
n
)
±5.0% of the set value
(at currents in the range of 10…40 x I
n
)
Pickup time
12
1.
Measurement mode
= default (depends on stage), current before fault = 0.0 x I
n
, f
n
= 60 Hz, ground-fault
current with nominal frequency injected from random phase angle, results based on statistical distribution of
1000 measurements
2. Includes the delay of the signal output contact
Minimum
Typical
Maximum
50N/G-3:
I
Fault
= 2 x set Pickup value
I
Fault
= 10 x set Pickup value
16 ms
11 ms
19 ms
12 ms
23 ms
14 ms
50N-1/2 & 50G-1/2 and
51N/G:
I
Fault
= 2 x set Pickup value
22 ms
24 ms
25 ms
Reset time
< 40 ms
Reset ratio
Typical 0.96
Retardation time
< 30 ms
Trip time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Trip time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
3
3. Maximum
Pickup value
= 2.5 x I
n
,
Pickup value
multiples in range of 1.5 to 20
Suppression of harmonics
RMS: No suppression
DFT: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,…
Peak-to-Peak: No suppression
Technical revision
Change
C
Minimum and default values changed to 20 ms for
the
Trip delay time
setting
Minimum value changed to 1.00 x I
n
for the
Pickup
value
setting.
Technical revision
Change
B
Minimum and default values changed to 40 ms for
the
Trip delay time
setting
Technical revision
Change
C
Pickup value
step changed to 0.005
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
Страница 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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