2.1.4
DIFFERENCES BETWEEN THE NORTH AMERICAN AND EUROPEAN STANDARDS
The IEEE and US curves are set differently to the IEC/UK curves, with regard to the time setting. A time multiplier
setting (TMS) is used to adjust the operating time of the IEC curves, whereas a time dial setting is used for the
IEEE/US curves. The menu is arranged such that if an IEC/UK curve is selected, the I> Time Dial cell is not visible
and vice versa for the TMS setting. For both IEC and IEEE/US type curves, a definite time adder setting is available,
which will increase the operating time of the curves by the set value.
2.2
PRINCIPLES OF IMPLEMENTATION
The range of protection products provides a very wide range of protection functionality. Despite the diverse range
of functionality provided, there is some commonality between the way many of the protection functions are
implemented. It is important to describe some of these basic principles before going deeper into the individual
protection functions.
A simple representation of protection functionality is shown in the following diagram:
&
Start signal
Trip Signal
&
Timer Blocking signals
1
V00654
Timer Settings
Threshold
IDMT/DT
Timer Blocking settings
Stage Blocking signals
1
Stage Blocking settings
Function inhibit
Directional Check
&
Energising quantity
Voltage
Current
Figure 92: Principle of protection function implementation
An energising quantity is either a voltage input from a system voltage transformer, a current input from a system
current transformer or another quantity derived from one or both of these. The energising quantities are extracted
from the power system. The signals are converted to digital quantities where they can be processed by the IEDs
internal processor.
In general, an energising quantity, be it a current, voltage, power, frequency, or phase quantity, is compared with a
threshold value, which may be settable, or hard-coded depending on the function. If the quantity exceeds (for
overvalues) or falls short of (for undervalues) the threshold, a signal is produced, which when gated with the
various inhibit and blocking functions becomes the Start signal for that protection function. This Start signal is
generally made available to Fixed Scheme Logic (FSL) and Programmable Scheme Logic (PSL) for further
processing. It is also passed through a timer function to produce the Trip signal. The timer function may be an
IDMT curve, or a Definite Time delay, depending on the function. This timer may also be blocked with timer
blocking signals and settings. The timer can be configured by a range of settings to define such parameters as the
type of curve, The Time Multiplier Setting, the IDMT constants, the Definite Time delay etc.
In GE products, there are usually several independent stages for each of the functions, and for three-phase
functions, there are usually independent stages for each of the three phases.
Typically some stages use an Inverse Definite Minumum time (IDMT) timer function, and others use a Definite Time
timer (DT) function. If the DT time delay is set to '0', then the function is known to be "instantaneous". In many
instances, the term 'instantaneous protection" is used loosely to describe Definite Time protection stages, even
when the stage may not theoretically be instantaneous.
Many protection functions require a direction-dependent decision. Such functions can only be implemented where
both current and voltage inputs are available. For such functions, a directional check is required, whose output can
block the Start signal should the direction of the fault be wrong.
P64x
Chapter 9 - Current Protection Functions
P64x-TM-EN-1.3
199
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: ......