Name
Type
Values (Range)
Unit
Description
ID_C
FLOAT32
0.00...80.00
xln
Differential current
phase C
MHZPDIF
Enum
1=on
2=blocked
3=test
4=test/blocked
5=off
Status
4.3.6.11
Technical data
Table 538: MHZPDIF Technical data
Characteristic
Value
Operation accuracy
Depending on the frequency of the current measured: f
n
±2
Hz
±1.5% of the set value or ±0.002 x I
n
Operate time ,
Minimum
Typical
Maximum
I
Fault
= 2.0 × set
Start Value
(one phase fault)
13 ms
17 ms
21 ms
I
Fault
= 2.0 × set
Start Value
(three phases fault)
11 ms
14 ms
17 ms
Reset time
<40 ms
Reset ratio
Typically 0.96
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value of ±20 ms
4.4
Unbalance protection
4.4.1
Negative-sequence overcurrent protection NSPTOC
4.4.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative-sequence overcurrent
protection
NSPTOC
I2>
46
1
Measurement mode = “Peak-to-Peak”, current before fault = 0.0 × I
n
, f
n
= 50 Hz, 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.
1MRS757644 H
Protection functions
620 series
Technical Manual
609
