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Section 4
1MAC050144-MB C
Protection functions
210
615 series ANSI
Technical Manual
4.1.9.10
Technical data
Table 198: 46M Technical data
4.1.10
Phase reversal protection, 46R
4.1.10.1
Identification
4.1.10.2
Function block
Figure 97:
Function block
4.1.10.3
Functionality
The phase-reversal protection 46R is used to detect the reversed connection of the phases
to a three-phase motor by monitoring the negative phase-sequence current I
2
of the motor.
46R picks up and trips when I
2
exceeds the set limit. 46R operates on definite time (DT)
characteristics. 46R is based on the calculated I
2
, and the function detects too high I
2
values during the motor startup. The excessive I
2
values are caused by incorrectly
connected phases, which in turn makes the motor rotate in the opposite direction.
The function contains a blocking functionality. It is possible to block function outputs,
timer or the function itself, if desired.
Pickup accuracy
Depending on the frequency of the current
measured: f
n
±2Hz
±1.5% of the set value or ±0.002 x I
n
Pickup time
12
1. Negative sequence current before fault = 0.0, f
n
= 60 Hz, results based on statistical distribution of 1000
measurements
2. Includes the delay of the signal output contact
Minimum
Typical
Maximum
I
Fault
= 2.0 x set
Pickup value
22 ms
24 ms
25 ms
Reset time
< 40 ms
Reset ratio
Typical 0.96
Retardation time
< 35 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.
Pickup value
multiples in range of 1.10 to 5.00
Suppression of harmonics
DFT: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,…
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase reversal protection
PREVPTOC
I2>>
46R
Содержание 615 Series ANSI
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Страница 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
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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