5
LOGIC SYMBOLS AND TERMS
Symbol
Description
Units
&
Logical "AND": Used in logic diagrams to show an AND-gate function.
S
"Sigma": Used to indicate a summation, such as cumulative current interrupted.
t
"Tau": Used to indicate a time constant, often associated with thermal characteristics.
d
Angular displacement
rad
q
Angular displacement
rad
F
Flux
rad
f
Phase shift
rad
w
System angular frequency
rad
<
Less than: Used to indicate an "under" threshold, such as undercurrent (current dropout).
>
Greater than: Used to indicate an "over" threshold, such as overcurrent (current overload)
1
Logical "OR": Used in logic diagrams to show an OR-gate function.
ABC
Anti-clockwise phase rotation.
ACB
Clock-wise phase rotation.
C
Capacitance
A
df/dt
Rate of Change of Frequency protection
Hz/s
df/dt>1
First stage of df/dt protection
Hz/s
F<1
First stage of underfrequency protection: Could be labeled 81-U in ANSI terminology.
Hz
F>1
First stage of overfrequency protection: Could be labeled 81-O in ANSI terminology.
Hz
fmax
Minimum required operating frequency
Hz
fmin
Minimum required operating frequency
Hz
fn
Nominal operating frequency
Hz
I
Current
A
I
Ù
Current raised to a power: Such as when breaker statistics monitor the square of ruptured current squared (Ù power =
2).
An
I
’f
Maximum internal secondary fault current (may also be expressed as a multiple of In)
A
I
<
An undercurrent element: Responds to current dropout.
A
I
>>
Current setting of short circuit element
In
I
>1
First stage of phase overcurrent protection: Could be labeled 51-1 in ANSI terminology.
A
I
>2
Second stage of phase overcurrent protection: Could be labeled 51-2 in ANSI terminology.
A
I
>3
Third stage of phase overcurrent protection: Could be labeled 51-3 in ANSI terminology.
A
I
>4
Fourth stage of phase overcurrent protection: Could be labeled 51-4 in ANSI terminology.
A
I
0
Earth fault current setting
Zero sequence current: Equals one third of the measured neutral/residual current.
A
I
1
Positive sequence current.
A
I
2
Negative sequence current.
A
I
2>
Negative sequence overcurrent protection (NPS element).
A
I
2pol
Negative sequence polarizing current.
A
I
A
Phase A current: Might be phase L1, red phase.. or other, in customer terminology.
A
I
B
Phase B current: Might be phase L2, yellow phase.. or other, in customer terminology.
A
I
C
Phase C current: Might be phase L3, blue phase.. or other, in customer terminology.
A
I
diff
Current setting of biased differential element
A
Appendix A - Symbols and Glossary
MiCOM P747
416
P747-TM-EN-1
P747-TM-EN-1.1
Summary of Contents for MiCOM P747 Agile
Page 2: ......
Page 16: ...Contents MiCOM P747 xiv P747 TM EN 1 P747 TM EN 1 1...
Page 20: ...Table of Figures MiCOM P747 xviii P747 TM EN 1 P747 TM EN 1 1...
Page 21: ...INTRODUCTION CHAPTER 1...
Page 22: ...Chapter 1 Introduction MiCOM P747 2 P747 TM EN 1 P747 TM EN 1 1...
Page 31: ...SAFETY INFORMATION CHAPTER 2...
Page 32: ...Chapter 2 Safety Information MiCOM P747 12 P747 TM EN 1 P747 TM EN 1 1...
Page 42: ...Chapter 2 Safety Information MiCOM P747 22 P747 TM EN 1 P747 TM EN 1 1...
Page 43: ...HARDWARE DESIGN CHAPTER 3...
Page 44: ...Chapter 3 Hardware Design MiCOM P747 24 P747 TM EN 1 P747 TM EN 1 1...
Page 74: ...Chapter 3 Hardware Design MiCOM P747 54 P747 TM EN 1 P747 TM EN 1 1...
Page 75: ...CONFIGURATION CHAPTER 4...
Page 76: ...Chapter 4 Configuration MiCOM P747 56 P747 TM EN 1 P747 TM EN 1 1...
Page 117: ...PROTECTION FUNCTIONS CHAPTER 5...
Page 118: ...Chapter 5 Protection Functions MiCOM P747 98 P747 TM EN 1 P747 TM EN 1 1...
Page 160: ...Chapter 5 Protection Functions MiCOM P747 140 P747 TM EN 1 P747 TM EN 1 1...
Page 161: ...MONITORING AND CONTROL CHAPTER 6...
Page 162: ...Chapter 6 Monitoring and Control MiCOM P747 142 P747 TM EN 1 P747 TM EN 1 1...
Page 211: ...SCADA COMMUNICATIONS CHAPTER 7...
Page 212: ...Chapter 7 SCADA Communications MiCOM P747 192 P747 TM EN 1 P747 TM EN 1 1...
Page 259: ...REDUNDANT ETHERNET CHAPTER 8...
Page 260: ...Chapter 8 Redundant Ethernet MiCOM P747 240 P747 TM EN 1 P747 TM EN 1 1...
Page 293: ...CYBER SECURITY CHAPTER 9...
Page 294: ...Chapter 9 Cyber Security MiCOM P747 274 P747 TM EN 1 P747 TM EN 1 1...
Page 313: ...SETTINGS APPLICATION SOFTWARE CHAPTER 10...
Page 314: ...Chapter 10 Settings Application Software MiCOM P747 294 P747 TM EN 1 P747 TM EN 1 1...
Page 322: ...Chapter 10 Settings Application Software MiCOM P747 302 P747 TM EN 1 P747 TM EN 1 1...
Page 323: ...BUSBAR COMMISSIONING TOOL CHAPTER 11...
Page 324: ...Chapter 11 Busbar Commissioning Tool MiCOM P747 304 P747 TM EN 1 P747 TM EN 1 1...
Page 330: ...Chapter 11 Busbar Commissioning Tool MiCOM P747 310 P747 TM EN 1 P747 TM EN 1 1...
Page 331: ...SCHEME LOGIC CHAPTER 12...
Page 332: ...Chapter 12 Scheme Logic MiCOM P747 312 P747 TM EN 1 P747 TM EN 1 1...
Page 348: ...Chapter 12 Scheme Logic MiCOM P747 328 P747 TM EN 1 P747 TM EN 1 1...
Page 349: ...INSTALLATION CHAPTER 13...
Page 350: ...Chapter 13 Installation MiCOM P747 330 P747 TM EN 1 P747 TM EN 1 1...
Page 361: ...COMMISSIONING INSTRUCTIONS CHAPTER 14...
Page 362: ...Chapter 14 Commissioning Instructions MiCOM P747 342 P747 TM EN 1 P747 TM EN 1 1...
Page 387: ...MAINTENANCE AND TROUBLESHOOTING CHAPTER 15...
Page 388: ...Chapter 15 Maintenance and Troubleshooting MiCOM P747 368 P747 TM EN 1 P747 TM EN 1 1...
Page 403: ...TECHNICAL SPECIFICATIONS CHAPTER 16...
Page 404: ...Chapter 16 Technical Specifications MiCOM P747 384 P747 TM EN 1 P747 TM EN 1 1...
Page 425: ...SYMBOLS AND GLOSSARY APPENDIX A...
Page 426: ...Appendix A Symbols and Glossary MiCOM P747 406 P747 TM EN 1 P747 TM EN 1 1...
Page 443: ...COMMISSIONING RECORD APPENDIX B...
Page 444: ...Appendix B Commissioning Record MiCOM P747 424 P747 TM EN 1 P747 TM EN 1 1...
Page 449: ...WIRING DIAGRAMS APPENDIX C...
Page 450: ...Appendix C Wiring Diagrams MiCOM P747 430 P747 TM EN 1 P747 TM EN 1 1...
Page 456: ...Appendix C Wiring Diagrams MiCOM P747 436 P747 TM EN 1 P747 TM EN 1 1...
Page 457: ......