ABB 615 Series - Technical Data

4.3.5.9 Technical data
Table 477: 87G, 87M Technical data
Characteristic
Value
Operation accuracy Depending on the frequency of the current
measured: f
n
±2 Hz
±3% of the set value or ±0.002 x I
n
Trip time
1)2)
Minimum Typical Maximum
Low stage
36 ms 40 ms 42 ms
High stage 18 ms 22 ms 27 ms
Reset time <40 ms
Reset ratio Typically 0.95
Retardation time <20 ms
1) F
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the power output contact
4.4 Unbalance protection
4.4.1 Negative-sequence overcurrent protection 46
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
4.4.1.2 Function block
A070758-ANSI V1 EN
Figure 297: Function block
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 587
Technical Manual