6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 278 -
Frequency protection (FRQ/DFRQ)
The frequency protection (FRQ and DFRQ) functions have six frequency elements (stages) to
detect frequency-deviations and frequency-changes, respectively. If the deviations or changes
are appeared, the FRQ and DFRQ function can issue a trip signal (or an alarm signal) in
response to the degree of the frequency-deviation and the frequency-change.
With respect to monitoring the frequency-deviation, either an under-frequency element
(UF) or an over-frequency element (OF) is used to monitor a frequency. The user can set the
degree of frequency deviation at each frequency. Generally, the UF element is applied to
monitor the balance between the power generation capability and the loads. The OF element
is used monitor the frequency to be within the normal range by load shedding; the OF element
is used to protect synchronous machines from possible damage owing to over-frequency
conditions.
With respect to monitoring the frequency-changes, either a frequency-rise element
(RISE) or a frequency-down element (DOWN) is used to monitor the frequency-change. To
monitor the frequency-change, the user should select either the RISE element or the DOWN
element at respective frequencies. The DFRQ is used to ensure the operation of load shedding
promptly when the change of frequency is very rapid.
To simplify the description, only stage 1 is discussed, but is applicable to the other stages;
hence, read the express for stage 1 as the other stages unless a special explanation or
instruction has been produced.
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Note:
The implementation of particular features is dependent upon the selection of
hardware and the configuration of functions. Several IED models do not support certain
features. To determine whether a particular feature has been implemented within an IED,
identify the IED ordering number; and check the order number for the “G&T position” whilst
referring to the comparison table below. For more information, see
Appendix: Ordering
.
Table 2.17-1 Comparative table in respective ordering numbers
Sec.
Feature
Ordering No. at “G&T”
31
32
–
Main features
✓
✓
✓
: Applicable NA: Not applicable
)
Содержание GR 200 Series
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Страница 1354: ...6F2S1915 0 46 GRZ200 Soft 031 032 1333 Appendix 1 Signal list for common function ...
Страница 1369: ...6F2S1915 0 46 GRZ200 Soft 031 032 1348 Unit mm Panel cut out for 1 2 case size Figure 2 2 3 Panel cutout figure 1 2 size case ...
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Страница 1480: ...6F2S1915 0 46 GRZ200 Soft 031 032 1459 Appendix 6 Ordering ...
Страница 1497: ...6F2S1915 0 46 GRZ200 Soft 031 032 1476 Appendix 7 Technical data ...
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Страница 1520: ...6F2S1915 0 46 GRZ200 Soft 031 032 1499 Appendix 9 Matrix between VCT terminals and relay applications ...
Страница 1523: ...6F2S1915 0 46 GRZ200 Soft 031 032 1502 Appendix 10 CT requirement ...
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