⎯
113
⎯
6 F 2 S 0 8 4 6
SY1UV
SY1OV
VB
VL
θ
θ
s
Operation of the impedance measuring element Z1 is expressed by the following equations.
−
OSTXB
≤
X
≤
OSTXF
(R
−
OSTR1)tan75
°
≤
X
≤
(R
−
OSTR2)tan75
°
where,
X = measured reactance
R = measured resistance
OSTXB, OSTXF = reactive reach setting
OSTR1, OSTR2 = resistive reach setting
2.5.6 Voltage and Synchronism Check Elements OVL, UVL, OVB, UVB, and SYN
The voltage check and synchronism check elements are used for autoreclose.
The output of the voltage check element is used to check whether the line and busbar are dead or
live. The voltage check element has undervoltage detectors UVL and UVB, and overvoltage
detectors OVL and OVB for the line voltage and busbar voltage check. The under voltage detector
checks that the line or busbar is dead while the overvoltage detector checks that it is live. These
detectors function in the same manner as other level detectors described later.
Figure 2.5.6.1 shows the characteristics of the synchronism check element used for the autoreclose
if the line and busbar are live.
The synchronism check element operates if both the voltage difference and phase angle difference
are within their setting values.
Figure 2.5.6.1 Synchronism Check Element
For the element SYN1, the voltage difference is checked by the following equations.
SY1OV
≤
VB
≤
SY1UV
SY1OV
≤
VL
≤
SY1UV
where,
VB = busbar voltage
VL = line voltage
SY1OV = lower voltage setting
Summary of Contents for GRZ100 B Series
Page 264: ... 263 6 F 2 S 0 8 4 6 Appendix A Block Diagram ...
Page 271: ... 270 6 F 2 S 0 8 4 6 ...
Page 272: ... 271 6 F 2 S 0 8 4 6 Appendix B Signal List ...
Page 307: ... 306 6 F 2 S 0 8 4 6 ...
Page 308: ... 307 6 F 2 S 0 8 4 6 Appendix C Variable Timer List ...
Page 310: ... 309 6 F 2 S 0 8 4 6 Appendix D Binary Input Output Default Setting List ...
Page 321: ... 320 6 F 2 S 0 8 4 6 ...
Page 322: ... 321 6 F 2 S 0 8 4 6 Appendix E Details of Relay Menu and LCD Button Operation ...
Page 331: ... 330 6 F 2 S 0 8 4 6 ...
Page 340: ... 339 6 F 2 S 0 8 4 6 Appendix G Typical External Connections ...
Page 377: ... 376 6 F 2 S 0 8 4 6 ...
Page 384: ... 383 6 F 2 S 0 8 4 6 Appendix J Return Repair Form ...
Page 388: ... 387 6 F 2 S 0 8 4 6 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Page 389: ... 388 6 F 2 S 0 8 4 6 ...
Page 390: ... 389 6 F 2 S 0 8 4 6 Appendix K Technical Data ...
Page 401: ... 400 6 F 2 S 0 8 4 6 ...
Page 402: ... 401 6 F 2 S 0 8 4 6 Appendix L Symbols Used in Scheme Logic ...
Page 405: ... 404 6 F 2 S 0 8 4 6 ...
Page 406: ... 405 6 F 2 S 0 8 4 6 Appendix M Example of Setting Calculation ...
Page 417: ... 416 6 F 2 S 0 8 4 6 ...
Page 418: ... 417 6 F 2 S 0 8 4 6 Appendix N IEC60870 5 103 Interoperability and Troubleshooting ...
Page 434: ... 433 6 F 2 S 0 8 4 6 Appendix P Inverse Time Characteristics ...
Page 437: ... 436 6 F 2 S 0 8 4 6 ...
Page 438: ... 437 6 F 2 S 0 8 4 6 Appendix Q Failed Module Tracing and Replacement ...
Page 444: ... 443 6 F 2 S 0 8 4 6 Appendix R Ordering ...
Page 447: ......