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M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
Figure 5-130: Underpower logic
5.7.6 Phase current
5.7.6.1 Menu
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE CURRENT
5.7.6.2 Inverse TOC curve characteristics
The inverse time overcurrent curves used by the time overcurrent elements are the IEEE, IEC, GE Type IAC, and I
2
t standard
curve shapes. This allows for simplified coordination with downstream devices.
If none of these curve shapes is adequate, FlexCurves can be used to customize the inverse time curve characteristics. The
definite time curve is also an option that can be appropriate if only simple protection is required.
Table 5-25: Overcurrent curve types
PHASE CURRENT
PHASE TOC1
PHASE TOC6
PHASE IOC1
PHASE IOC12
PHASE
DIRECTIONAL 1
PHASE
DIRECTIONAL 2
IEEE
IEC
GE type IAC
Other
IEEE Extremely Inverse
IEC Curve A (BS142)
IAC Extremely Inverse
I
2
t
Summary of Contents for M60
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