The CTS monitors the positive and negative sequence currents of all CTs (2 to 5, depending on the model). A faulty
CT is determined if the following conditions are present at the same time:
●
The positive sequence current in at least two current inputs exceeds the set release threshold I1 (CTS I1
setting under the SUPERVISON column). This also means that CTS can only operate if minimum load current
of the protected object is present.
●
A high set ratio of negative to positive sequence current, CTS I2/I1>2, is exceeded at one end.
●
At all other ends the ratio of negative to positive sequence current is less than a low set value, CTS I2/I1> 1,
or no significant current is present (positive sequence current is below the release threshold I1).
Only a single or double phase CT failure can be detected by this logic. The probability of symmetrical three-phase
CT failures is very low, therefore in practice this is not a significant problem.
3.2
CTS LOGIC
V01227
CT1 I2/I1 >
CTS I2/I1>2
&
CT2 I2/I1 >
CTS I2/I1>1
CT3 I2/I1 >
CTS I2/I1>1
CT4 I2/I1 >
CTS I2/I1>1
CT5 I2/I1 >
CTS I2/I1>1
&
1
≥2
CT1 I1 >
CTS I1
CT2 I1 >
CTS I1
CT3 I1 >
CTS I1
CT5 I1 >
CTS I1
CT4 I1 >
CTS I1
Inhibit CTS
Inrush detector
CT Exclusion Alarm
&
&
CT1 Fail
CTS CT1
1
CT Fail alarm
1
&
CTS Blk
CT1 I2/I1 >
CTS I2/I1>1
&
CT2 I2/I1 >
CTS I2/I1>2
CT3 I2/I1 >
CTS I2/I1>1
CT4 I2/I1 >
CTS I2/I1>1
CT5 I2/I1 >
CTS I2/I1>1
&
&
&
CT2 Fail
CTS CT2
CT1 I2/I1 >
CTS I2/I1>1
&
CT2 I2/I1 >
CTS I2/I1>1
CT3 I2/I1 >
CTS I2/I1>2
CT4 I2/I1 >
CTS I2/I1>1
CT5 I2/I1 >
CTS I2/I1>1
&
&
&
CT3 Fail
CTS CT3
CT1 I2/I1 >
CTS I2/I1>1
&
CT2 I2/I1 >
CTS I2/I1>1
CT3 I2/I1 >
CTS I2/I1>1
CT4 I2/I1 >
CTS I2/I1>2
CT5 I2/I1 >
CTS I2/I1>1
&
&
&
CT4 Fail
CTS CT4
CT1 I2/I1 >
CTS I2/I1>1
&
CT2 I2/I1 >
CTS I2/I1>1
CT3 I2/I1 >
CTS I2/I1>1
CT4 I2/I1 >
CTS I2/I1>1
CT5 I2/I1 >
CTS I2/I1>2
&
&
&
CT5 Fail
CTS CT5
CTS Status
Indication
Restrain
1
Figure 134: CTS logic diagram
Chapter 14 - Supervision
P64x
292
P64x-TM-EN-1.3
Содержание P642
Страница 2: ......
Страница 18: ...Contents P64x xvi P64x TM EN 1 3 ...
Страница 24: ...Table of Figures P64x xxii P64x TM EN 1 3 ...
Страница 25: ...CHAPTER 1 INTRODUCTION ...
Страница 26: ...Chapter 1 Introduction P64x 2 P64x TM EN 1 3 ...
Страница 36: ...Chapter 1 Introduction P64x 12 P64x TM EN 1 3 ...
Страница 37: ...CHAPTER 2 SAFETY INFORMATION ...
Страница 38: ...Chapter 2 Safety Information P64x 14 P64x TM EN 1 3 ...
Страница 50: ...Chapter 2 Safety Information P64x 26 P64x TM EN 1 3 ...
Страница 51: ...CHAPTER 3 HARDWARE DESIGN ...
Страница 52: ...Chapter 3 Hardware Design P64x 28 P64x TM EN 1 3 ...
Страница 87: ...CHAPTER 4 SOFTWARE DESIGN ...
Страница 88: ...Chapter 4 Software Design P64x 64 P64x TM EN 1 3 ...
Страница 98: ...Chapter 4 Software Design P64x 74 P64x TM EN 1 3 ...
Страница 99: ...CHAPTER 5 CONFIGURATION ...
Страница 100: ...Chapter 5 Configuration P64x 76 P64x TM EN 1 3 ...
Страница 121: ...CHAPTER 6 TRANSFORMER DIFFERENTIAL PROTECTION ...
Страница 122: ...Chapter 6 Transformer Differential Protection P64x 98 P64x TM EN 1 3 ...
Страница 165: ...CHAPTER 7 TRANSFORMER CONDITION MONITORING ...
Страница 166: ...Chapter 7 Transformer Condition Monitoring P64x 142 P64x TM EN 1 3 ...
Страница 189: ...CHAPTER 8 RESTRICTED EARTH FAULT PROTECTION ...
Страница 190: ...Chapter 8 Restricted Earth Fault Protection P64x 166 P64x TM EN 1 3 ...
Страница 215: ...CHAPTER 9 CURRENT PROTECTION FUNCTIONS ...
Страница 216: ...Chapter 9 Current Protection Functions P64x 192 P64x TM EN 1 3 ...
Страница 249: ...CHAPTER 10 CB FAIL PROTECTION ...
Страница 250: ...Chapter 10 CB Fail Protection P64x 226 P64x TM EN 1 3 ...
Страница 259: ...CHAPTER 11 VOLTAGE PROTECTION FUNCTIONS ...
Страница 260: ...Chapter 11 Voltage Protection Functions P64x 236 P64x TM EN 1 3 ...
Страница 274: ...Chapter 11 Voltage Protection Functions P64x 250 P64x TM EN 1 3 ...
Страница 275: ...CHAPTER 12 FREQUENCY PROTECTION FUNCTIONS ...
Страница 276: ...Chapter 12 Frequency Protection Functions P64x 252 P64x TM EN 1 3 ...
Страница 286: ...Chapter 12 Frequency Protection Functions P64x 262 P64x TM EN 1 3 ...
Страница 287: ...CHAPTER 13 MONITORING AND CONTROL ...
Страница 288: ...Chapter 13 Monitoring and Control P64x 264 P64x TM EN 1 3 ...
Страница 306: ...Chapter 13 Monitoring and Control P64x 282 P64x TM EN 1 3 ...
Страница 307: ...CHAPTER 14 SUPERVISION ...
Страница 308: ...Chapter 14 Supervision P64x 284 P64x TM EN 1 3 ...
Страница 322: ...Chapter 14 Supervision P64x 298 P64x TM EN 1 3 ...
Страница 323: ...CHAPTER 15 DIGITAL I O AND PSL CONFIGURATION ...
Страница 324: ...Chapter 15 Digital I O and PSL Configuration P64x 300 P64x TM EN 1 3 ...
Страница 336: ...Chapter 15 Digital I O and PSL Configuration P64x 312 P64x TM EN 1 3 ...
Страница 337: ...CHAPTER 16 COMMUNICATIONS ...
Страница 338: ...Chapter 16 Communications P64x 314 P64x TM EN 1 3 ...
Страница 397: ...CHAPTER 17 CYBER SECURITY ...
Страница 398: ...Chapter 17 Cyber Security P64x 374 P64x TM EN 1 3 ...
Страница 415: ...CHAPTER 18 INSTALLATION ...
Страница 416: ...Chapter 18 Installation P64x 392 P64x TM EN 1 3 ...
Страница 429: ...5 2 CASE DIMENSIONS 60TE E01409 Figure 167 60TE case dimensions P64x Chapter 18 Installation P64x TM EN 1 3 405 ...
Страница 431: ...CHAPTER 19 COMMISSIONING INSTRUCTIONS ...
Страница 432: ...Chapter 19 Commissioning Instructions P64x 408 P64x TM EN 1 3 ...
Страница 454: ...V01505 Figure 173 Harmonic Restraint Test Plane Chapter 19 Commissioning Instructions P64x 430 P64x TM EN 1 3 ...
Страница 460: ...Chapter 19 Commissioning Instructions P64x 436 P64x TM EN 1 3 ...
Страница 461: ...CHAPTER 20 MAINTENANCE AND TROUBLESHOOTING ...
Страница 462: ...Chapter 20 Maintenance and Troubleshooting P64x 438 P64x TM EN 1 3 ...
Страница 477: ...CHAPTER 21 TECHNICAL SPECIFICATIONS ...
Страница 478: ...Chapter 21 Technical Specifications P64x 454 P64x TM EN 1 3 ...
Страница 507: ...APPENDIX A ORDERING OPTIONS ...
Страница 508: ...Appendix A Ordering Options P64x P64x TM EN 1 3 ...
Страница 512: ...Appendix A Ordering Options P64x A4 P64x TM EN 1 3 ...
Страница 513: ...APPENDIX B SETTINGS AND SIGNALS ...
Страница 515: ...APPENDIX C WIRING DIAGRAMS ...
Страница 516: ...Appendix C Wiring Diagrams P64x P64x TM EN 1 3 ...
Страница 590: ......
Страница 591: ......