ABB Relion 670 Series Applications Manual page 157
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Also See for Relion 670 Series:
- Technical manual (1432 pages) ,
- Technical reference manual (1232 pages) ,
- Applications manual (944 pages)
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1MRK 505 370-UUS Rev. K
Table 26:
Curve name
ANSI Extremely Inverse
ANSI Very Inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI/IEEE Definite time
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
IEC Normal Inverse
IEC Very Inverse
IEC Inverse
IEC Extremely Inverse
IEC Short Time Inverse
IEC Long Time Inverse
IEC Definite Time
User Programmable
ASEA RI
RXIDG or RD (logarithmic)
The different characteristics are described in Technical manual.
Pickupx: Operate phase current level for step x given in % of IB.
Ix>Max and Ix>Min should only be changed if remote setting of operation current level, Ix>, is used. The
limits are used for decreasing the used range of the Ix> setting. If Ix> is set outside Ix>Max and Ix>Min,
the closest of the limits to Ix> is used by the function. If Ix>Max is smaller than Ix>Min, the limits are
swapped.
tx: Definite time delay for step x. The definite time tx is added to the inverse time when inverse time
characteristic is selected. Note that the value set is the time between activation of the start and the trip
outputs.
TDx: Time multiplier for inverse time delay for step x.
IMinx: Minimum operate current in % of IB for all inverse time characteristics, below which no operation
takes place.
IMinx: Minimum pickup current for step x in % of IBase. Set IMinx below Pickupx for every step to
achieve ANSI reset characteristic according to standard. If IMinx is set above Pickupx for any step the
ANSI reset works as if current is zero when current drops below IMinx.
txMin: Minimum trip time for all inverse time characteristics. At high currents the inverse time
characteristic might give a very short operation time. By setting this parameter the operation time of the
step can never be shorter than the setting. Setting range: 0.000 - 60.000s in steps of 0.001s.
Busbar protection REB670
Application manual
Inverse time characteristics
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Section 7
Current protection
151
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