9.32
SEL-311C Relay Instruction Manual Date Code 20060320
Setting the Relay
Relay Word Bits (Used in SEL
OGIC Control Equations)
52 81D1 Level 1 instantaneous frequency element (with corresponding
pickup setting 81D1P; see Figure 3.34)
Testing
81D2 Level 2 instantaneous frequency element (with corresponding
pickup setting 81D2P; see Figure 3.34)
81D3 Level 3 instantaneous frequency element (with corresponding
pickup setting 81D3P; see Figure 3.34)
81D4 Level 4 instantaneous frequency element (with corresponding
pickup setting 81D4P; see Figure 3.34)
81D5 Level 5 instantaneous frequency element (with corresponding
pickup setting 81D5P; see Figure 3.34)
81D6 Level 6 instantaneous frequency element (with corresponding
pickup setting 81D6P; see Figure 3.34)
27B81 Undervoltage element for frequency element blocking
(any phase voltage below pickup setting 27B81P; see Figure 3.33)
*
53 81D1T Level 1 definite-time frequency element 81D1T timed out
(derived from 81D1; see Figure 3.34)
Tripping, Control
81D2T Level 2 definite-time frequency element 81D2T timed out
(derived from 81D2; see Figure 3.34)
81D3T Level 3 definite-time frequency element 81D3T timed out
(derived from 81D3; see Figure 3.34)
81D4T Level 4 definite-time frequency element 81D4T timed out
(derived from 81D4; see Figure 3.34)
81D5T Level 5 definite-time frequency element 81D5T timed out
(derived from 81D5; see Figure 3.34)
81D6T Level 6 definite-time frequency element 81D6T timed out
(derived from 81D6; see Figure 3.34)
*
*
a
Important: See Appendix F: Setting Negative-Sequence Overcurrent Elements for special instructions on setting negative-sequence
overcurrent elements.
Table 9.6 Relay Word Bit Definitions for the SEL-311C (Sheet 16 of 16)
Row Bit Definition Primary Application
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