Application Notes
P44x/EN AP/E33
MiCOM P441/P442 & P444
Page 81/220
It follows that, for an open circuit in a particular part of the system, I2/I1 can be determined
from the ratio of zero sequence to negative sequence impedance. It must be noted however,
that this ratio may vary depending upon the fault location. It is desirable therefore to apply as
sensitive a setting as possible. In practice, this minimum setting is governed by the levels of
standing negative phase sequence current present on the system. This can be determined
from a system study, or by making use of the relay measurement facilities at the
commissioning stage. If the latter method is adopted, it is important to take the
measurements during maximum system load conditions, to ensure that all single phase
loads are accounted for.
Note that a minimum value of 8% negative phase sequence current is required for
successful relay operation.
Since sensitive settings have been employed, it can be expected that the element will
operate for any unbalance condition occurring on the system (for example, during a single
pole autoreclose cycle). Hence, a long time delay is necessary to ensure co-ordination with
other protective devices. A 60 second time delay setting may be typical.
The following table shows the relay menu for the Broken Conductor protection, including the
available setting ranges and factory defaults:-
Menu text
Default setting
Setting range
Step size
Min
Max
GROUP 1
BROKEN CONDUCTOR
Broken Conductor
Enabled
Enabled/Disabled
N/A
I2/I1 0.2
0.2
1
0.01
I2/I1 Time Delay
60
0s
100s
1s
I2/I1 Trip
Disabled*
Enabled
Disabled
N/A
*
If disabled, only a Broken Conductor Alarm is possible.
2.16.2 Example
Setting
The following information was recorded by the relay during commissioning;
I
full load
= 1000A
I
2
= 100A
therefore the quiescent I2/I1 ratio is given by;
I
2
/I
1
= 100/1000 = 0.05
To allow for tolerances and load variations a setting of 200% of this value may be typical:
Therefore set I2/I1 = 0.2
Set I2/I1 Time Delay = 60s to allow adequate time for short circuit fault clearance by time
delayed protections.
Содержание MiCOM P441
Страница 1: ...MiCOM P441 P442 P444 Numerical Distance Protection VC2 x Technical Guide P44x EN T E44...
Страница 2: ......
Страница 4: ...P44x EN T E44 Technical Guide Page 2 2 MiCOM P441 P442 P444 BLANK PAGE...
Страница 5: ...Pxxxx EN SS C11 SAFETY SECTION...
Страница 6: ......
Страница 8: ...Pxxxx EN SS C11 Page 2 10 Safety Section BLANK PAGE...
Страница 17: ...Update Documentation P44x EN AD E44 MiCOM P441 P442 P444 UPDATE DOCUMENTATION VERSION C2 X...
Страница 18: ......
Страница 22: ...P44x EN AD E44 Update Documentation Page 4 82 MiCOM P441 P442 P444 BLANK PAGE...
Страница 23: ...Update Documentation P44x EN AD E44 MiCOM P441 P442 P444 Page 5 82 P44X EN IT E33 INTRODUCTION...
Страница 24: ......
Страница 33: ...Update Documentation P44x EN AD E44 MiCOM P441 P442 P444 Page 15 82 P44X EN HW E33 RELAY DESCRIPTION...
Страница 34: ......
Страница 43: ...Update Documentation P44x EN AD E44 MiCOM P441 P442 P444 Page 25 82 APPLICATION GUIDE P44X EN AP E33...
Страница 44: ......
Страница 96: ...P44x EN AD E44 Update Documentation Page 78 82 MiCOM P441 P442 P444 BLANK PAGE...
Страница 97: ...Update Documentation P44x EN AD E44 MiCOM P441 P442 P444 Page 79 82 TECHNICAL DATA P44X EN TD E33...
Страница 98: ......
Страница 100: ...P44x EN AD E44 Update Documentation Page 82 82 MiCOM P441 P442 P444 BLANK PAGE...
Страница 101: ...Introduction P44x EN IT E33 MiCOM P441 P442 P444 INTRODUCTION...
Страница 102: ......
Страница 104: ...P44x EN IT E33 Introduction Page 2 24 MiCOM P441 P442 P444 BLANK PAGE...
Страница 127: ...Relay Description P44x EN HW E33 MiCOM P441 P442 P444 RELAY DESCRIPTION...
Страница 128: ......
Страница 132: ...P44x EN HW E33 Relay Description Page 4 44 MiCOM P441 P442 P444 BLANK PAGE...
Страница 152: ...P44x EN HW E33 Relay Description Page 24 44 MiCOM P441 P442 P444 Example isolated AC fault...
Страница 153: ...Relay Description P44x EN HW E33 MiCOM P441 P442 P444 Page 25 44...
Страница 173: ...Application Notes P44x EN AP E33 MiCOM P441 P442 P444 APPLICATION NOTES...
Страница 174: ......
Страница 180: ...P44x EN AP E33 Application Notes Page 6 220 MiCOM P441 P442 P444 BLANK PAGE...
Страница 357: ...Application Notes P44x EN AP E33 MiCOM P441 P442 P444 Page 183 220...
Страница 364: ...P44x EN AP E33 Application Notes Page 190 220 MiCOM P441 P442 P444 BLANK PAGE...
Страница 394: ...P44x EN AP E33 Application Notes Page 220 220 MiCOM P441 P442 P444 BLANK PAGE...
Страница 395: ...Technical Data P44x EN TD E33 MiCOM P441 P442 P444 TECHNICAL DATA...
Страница 396: ......
Страница 400: ...P44x EN TD E33 Technical Data Page 4 30 MiCOM P441 P442 P444 BLANK PAGE...
Страница 427: ...Installation P44x EN IN E33 MiCOM P441 P442 P444 INSTALLATION...
Страница 428: ......
Страница 430: ...P44x EN IN E33 Installation Page 2 10 MiCOM P441 P442 P444 BLANK PAGE...
Страница 438: ...P44x EN IN E33 Installation Page 10 10 MiCOM P441 P442 P444 BLANK PAGE...
Страница 439: ...Commissioning P44x EN CM E33 MiCOM P441 P442 P444 COMMISSIONING...
Страница 440: ......
Страница 494: ...P44x EN CM E33 Commissioning Page 54 54 MiCOM P441 P442 P444 BLANK PAGE...
Страница 495: ...Commissioning Test Record Sheets P44x EN RS E33 MiCOM P441 P442 P444 COMMISSIONING TEST RECORD SHEETS...
Страница 496: ......
Страница 498: ...P44x EN RS E33 Commissioning Test Record Sheets Page 2 10 MiCOM P441 P442 P444 BLANK PAGE...
Страница 507: ...Connection Diagrams P44x EN CO E33 MiCOM P441 P442 P444 CONNECTION DIAGRAMS...
Страница 508: ......
Страница 510: ...P44x EN CO E33 Connection Diagrams Page 2 12 MiCOM P441 P442 P444 BLANK PAGE...
Страница 520: ...P44x EN CO E33 Connection Diagrams Page 12 12 MiCOM P441 P442 P444 BLANK PAGE...
Страница 521: ...Courrier Data Base P44x EN GC E44 MiCOM P441 P442 P444 CONFIGURATION MAPPING...
Страница 610: ...Courier Data Base P44x EN GC E44 MiCOM P441 P442 P444 DEFAULT PROGRAMMABLE SCHEME LOGIC PSL...
Страница 615: ...Menu Content Tables P44x EN HI E44 MiCOM P441 P442 P444 MENU CONTENT TABLES...
Страница 616: ......
Страница 624: ......
Страница 626: ......
Страница 634: ...P44x EN VC E44 Hardware Software Version Page 8 8 MiCOM P441 P442 P444 BLANK PAGE...
Страница 635: ......