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1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
219
Technical Manual
4.1.12.9
Technical data
Table 215: 51LR Technical data
4.1.13
Loss of Phase, 37
4.1.13.1
Identification
Table 216: Function identification
4.1.13.2
Function block
Figure 103:
Function block symbol
4.1.13.3
Functionality
The phase undercurrent protection 37 is used to detect an undercurrent which is considered
as a fault condition.
37 starts when the current is less than the set limit. Operation time characteristics are
according to definite time (DT).
The function contains a blocking functionality. It is possible to block function outputs and
reset the definite timer if desired.
Characteristic
Value
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
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
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase undercurrent protection
PHPTUC1
3I<
37
I_A
I_B
OPERATE
I_C
BLOCK
START
OPR_A
OPR_B
OPR_C
ST_A
ST_B
ST_C
PHPTUC1
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