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3.2
APPLICATION NOTES
3.2.1
LOL SETTING GUIDELINES
Set the life hours at the reference maximum Hotspot temperature. According to IEEE Std. C57.91-1995, the normal
insulation life at the reference temperature in hours or years must be user-defined. The following table extracted
from IEEE Std. C57.91-1995 gives values of normal insulation life for a well-dried, oxygen-free 65°C average
winding temperature rise insulation system at the reference temperature of 110°C.
Basis
Normal Insulation life Hours
Normal Insulation Life Years
50% retained tensile strength of insulation (former IEEE Std
C57.92-1981 criterion)
65000
7.42
25% retained tensile strength of insulation
135000
15.41
200 retained degree of polymerization in insulation
150000
17.12
Interpretation of distribution transformer functional life test
data (former IEEE Std. C57.91-1981)
180000
20.55
Note:
Tensile strength or degree of polymerization (D.P.) retention values were determined by sealed tube aging on well-dried
insulation samples in oxygen-free oil.
Note:
Refer to I.2 in annex I of the IEEE Std. C57.91-1995 for discussion of the effect of higher values of water and oxygen and also
for the discussion on the basis given above.
You should set the designed Hotspot temperature setting (Designed HS temp) to 110°C if the transformer is rated
65°C average winding rise. If the transformer is rated 55°C average winding rise, set it to 95°C.
As recommended by IEEE C57.91-1995, set the Constant B Set setting to 5000.
If the calculated aging acceleration factor is greater than the setting FAA> Set and the time delay tFAA> Set has
elapsed, the FAA alarm DDB signal is activated.
If the calculated loss of life is greater than the setting LOL>1 Set and the time delay tLOL> Set has elapsed, the
LOL alarm DDB signal is activated.
3.2.2
EXAMPLE
Consider a new 65°C average winding rise rated transformer whose life hours figure at designed maximum
Hotspot temperature is 180,000 hrs. As a result, you set the Life Hours at HS setting to
180,000
, and the
Designed HS temp setting to 110.0°C. Set Constant B Set to
15,000
as recommended by IEEE. The aging
acceleration factor takes into consideration the constant B and the hottest spot temperature calculated by the
thermal function. For a distribution transformer, IEEE suggests 200°C as the limit for the maximum hot spot
temperature. The aging acceleration factor alarm will be asserted when 70% of the 200°C has been reached. The
aging acceleration factor is calculated as follows:
FAA
e
e
B
B
hottest spot tempt
B
B
=
=
−
−
−
+
−
×
+
383
273
383 0 7 200 273
.
=
17 2
.
Therefore:
FAA>set should be set to
17.2
. tFAA> Set may be set to
10.00 min
. LOL>1 Set may be set to
115,000 hrs
, if
it is considered that the transformer has 65,000 hrs left (Life Hours at HS – hours left = 180,000 – 65,000 = 115,000
hrs). tLOL> Set may be set to
10.00 min
. Finally, the Reset Life Hours setting determines the value of the LOL
Chapter 7 - Transformer Condition Monitoring
P64x
152
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: ......