ABB Relion 670 Series Applications Manual page 243

1MRK 511 401-UUS F
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IEC13000258 V1 EN-US
Figure 104: Examples of time frequency characteristics with various frequency band limits
Another application for the FTAQFVR (81A) 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.
10.4.3 Setting guidelines
Among the generator protection functions, the frequency time accumulation protection FTAQFVR
(81A) 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 (81A) 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
base values for settings function GBASVAL. The
reference of base values.
Bay control REC670
Application manual
Prohibited Operation
Continuous operation
Restricted Time Operation
0.1 1 10 100
Time (Minutes)
Prohibited Operation
Restricted Time Operation
Continuous operation
Restricted Time Operation Prohibited Operation
0.1 1 10 100
Time (Minutes)
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Restricted Time Operation
Continuous operation
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Restricted Time Operation
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Time (Minutes)
Prohibited Operation
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Continuous operation
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Restricted Time Operation
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1000 0.01 0.1 1
Time (Minutes)
IBase and primary voltage VBase are set in the global
GlobalBaseSel is used to select GBASVAL for the
Frequency protection
Prohibited Operation
Prohibited Operation
10 100 1000
Prohibited Operation
10 100 1000
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