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1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
213
Technical Manual
4.1.10.9
Technical data
Table 204: 46R Technical data
4.1.11
Loss of load protection 37
4.1.11.1
Identification
4.1.11.2
Function block
Figure 99:
Function block
4.1.11.3
Functionality
The loss of load protection 37 is used to detect a sudden load loss which is considered as
a fault condition.
37 picks up when the current is less than the set limit. It operates with the definite time
(DT) characteristics, which means that the function operates after a predefined trip time
and resets when the fault current disappears.
The function contains a blocking functionality. It is possible to block function outputs, the
definite timer or the function itself, if desired.
4.1.11.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
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
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
Loss of load protection
LOFLPTUC
3I<
37
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
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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 ...
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