For individual windings, you set the MonitoredWinding setting to to
HV, LV, TV
accordingly. If you wish to
protect the transformer as a whole set the MonitoredWinding setting to
Biased Current
, which provides an
overall loading picture of the transformer.
The device provides two 3-stage Definite Time delayed trip elements; one element for Hotspot temperature and
one for Top Oil temperature. Top Oil temperature can be calculated, or measured directly using CLIO or RTD
methods, but Hotspot temperature is always calculated.
A pre-trip alarm can be configured in the tPre-trip Set setting. This alarm indicates that thermal overload will trip
after the set time if the load level remains unchanged.
Four cooling modes are available. You can set the oil exponent constant and winding exponent constant
independently for each mode. You can set the cooling mode automatically in the PSL or manually in the setting file.
For the latter, you will need to configure two opto-inputs as CM Select 1X and CM Select X1, and you must wire the
contacts to energise or de-energise these inputs. The selected cooling mode would then be as follows:
CM Select 1X
CM Select X1
Selected Cooling Mode
0
0
1
0
1
2
1
0
3
1
1
4
To calculate the Top Oil and hotspot winding temperature, the device takes into consideration the ratio of the
actual load to the rated load. If the monitored winding is set to
HV
,
LV
, or
TV
, the rated load is determined by the
HV rating, LV rating, or TV rating settings respectively and the Irated setting. If the monitored winding is set as
the the biased current, the rated load is calculated using the Sref power rating setting in the SYSTEM CONFIG
column and the Irated setting in the THERMAL PROTECTION column.
The thermal overload model is executed once every power cycle. The thermal overload trip can be based on either
hot spot temperature or top oil temperature, or both.
The device has up to three hot spot stages and up to three top oil stages. The tripping signal, Top Oil T>x Trip, is
asserted when the top oil (measured or calculated) temperature is above the setting, Top Oil>x Set, and the time
delay, tTop Oil>x Set has elapsed. Also, the tripping signal, Hotspot>x Trip, is asserted when the hottest-spot
(calculated only) temperature is above the setting, Hotspot>x Set, and the time delay, tHotspot>x Set has elapsed.
2.1.1
THERMAL OVERLOAD BIAS CURRENT
The biased current used by the thermal protection is not the same as the biased current used by the differential
protection. No vector correction or zero sequence filtering is performed. To calculate the bias current, the thermal
element considers the maximum RMS current on a per winding basis. Note that the bias current calculation
performed by the thermal element is not on a per-phase basis. The thermal bias current calculation is as follows:
I
Max I
I
I
HV
FLC
Max I
I
bias
HVArms
HVBrms
HVCrms
Sref
LVArms
L
=
[
]
+
,
,
_
,
V
VBrms
LVCrms
Sref
TVArms
TVBrms
TVCrms
I
LV
FLC
Max I
I
I
TV
,
_
,
,
_
[
]
+
[
]
F
FLC
Sref
2
where:
●
HV_FLC
Sref
= HV full load current at the reference power
●
LV_FLC
Sref
= LV full load current at the reference power
●
TV_FLC
Sref
= TV full load current at the reference power
P64x
Chapter 7 - Transformer Condition Monitoring
P64x-TM-EN-1.3
145
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: ......