Setting Guidelines - ABB Relion REC670 Applications Manual

Section 9
Frequency protection
However, the IEEE/ANSI C37.106-2003 standard "Guide for Abnormal Frequency Protection for
Power Generating Plants" provides some examples where the time accumulated within each
frequency range is as shown in Figure 84.
62
60
58
56
0.01
62
60
58
56
0.01
IEC13000258 V1 EN-US
Figure 84: 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.
9.4.3

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).
196
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)
limits
62
Restricted Time Operation
Continuous operation
60
Restricted Time Operation
58
56
1000 0.01 0.1 1
Time (Minutes)
Prohibited Operation
62
Continuous operation
60
58
Restricted Time Operation
56
1000 0.01 0.1 1
Time (Minutes)
1MRK 511 358-UEN A
Prohibited Operation
Prohibited Operation
10 100 1000
Prohibited Operation
10 100 1000
IEC13000258-1-en.ai
GUID-62C6D764-CAF2-4C2F-B91A-EBC611987D72 v3
Application manual