ABB Relion 670 Series Applications Manual page 286

Section 11
Frequency protection
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IEC13000258 V1 EN-US
Figure 133: Examples of time frequency characteristics with various frequency band
Another application for the FTAQFVR protection function is to supervise variations from rated
voltage-frequency. Generators are designed to accommodate the IEC 60034-3:1996
requirement of continuous operation within the confines of their capability curves over the
ranges of +/-5% in voltage and +/-2% in frequency. Operation of the machine at rated power
outside these voltage-frequency limits lead to increased temperatures and reduction of
insulation life.
11.4.3 Setting guidelines
Among the generator protection functions, the frequency time accumulation protection
FTAQFVR may be used to protect the generator as well as the turbine. Abnormal frequencies
during normal operation cause material fatigue on turbine blades, trip points and time delays
should be established based on the turbine manufacture's requirements and
recommendations.
Continuous operation of the machine at rated power outside voltage-frequency limits lead to
increased rotor temperatures and reduction of insulation life. Setting of extent, duration and
frequency of occurrence should be set according to manufacture's requirements and
recommendations.
Setting procedure on the IED
The parameters for the frequency time accumulation protection FTAQFVR are set using the
local HMI or through the dedicated software tool in Protection and Control Manager
(PCM600).
Common base IED values for primary current
global base values for settings function GBASVAL. The
GBASVAL for the reference of base values.
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Prohibited Operation
Continuous operation
Restricted Time Operation
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Time (Minutes)
Prohibited Operation
Restricted Time Operation
Continuous operation
Prohibited Operation
Restricted Time Operation
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Time (Minutes)
limits
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Prohibited Operation
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IBase and primary voltage UBase are set in the
GlobalBaseSel is used to select
1MRK 511 401-UEN Rev. K
Prohibited Operation
Prohibited Operation
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Prohibited Operation
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IEC13000258-1-en.ai
GUID-62C6D764-CAF2-4C2F-B91A-EBC611987D72 v3
Bay control REC670
Application manual