P44x/EN AP/E33
Application Notes
Page 72/220
MiCOM P441/P442 & P444
2.13.3 Typical
Current
Settings
The three current thresholds must be set above the maximum expected residual current
unbalance, the maximum negative sequence unbalance, and the maximum expected power
swing current. Generally, the power swing current will not exceed 2.In. Typical setting limits
are given in Table 7 and Table 8 below:
Parameter
Minimum Setting (to avoid
maloperation for asymmetry
in power swing currents)
Maximum Setting (to ensure
unblocking for line faults)
Typical
Setting
IN>
> 30%
< 100%
40%
I
2
>
> 10%
< 50%
30%
TABLE 7 - BIAS THRESHOLDS TO UNBLOCK PSB FOR LINE FAULTS
Parameter
Minimum Setting
Maximum Setting
Imax line>
1.2 x (maximum power swing
current)
0.8 x (minimum phase fault current level)
TABLE 8 - PHASE CURRENT THRESHOLD TO UNBLOCK PSB FOR LINE FAULTS
2.13.4
Removal of PSB to Allow Tripping for Prolonged Power Swings
It is possible to limit the time for which blocking of any distance protection zones is applied.
Thus, certain locations on the power system can be designated as split points, where circuit
breakers will trip three pole should a power swing fail to stabilise. Power swing blocking is
automatically removed after the Unblocking Delay with typical settings:
−
30s if a near permanent block is required;
−
2s if unblocking is required to split the system.
2.14
Directional and non-directional overcurrent protection
The overcurrent protection included in the P441, P442 and P444 relays provides two stage
non-directional / directional three phase overcurrent protection and two non directional
stages (I>3 and I>4), with independent time delay characteristics. One or more stages may
be enabled, in order to complement the relay distance protection. All overcurrent and
directional settings apply to all three phases but are independent for each of the four stages.
The first two stages of overcurrent protection, I>1 and I>2 have time delayed characteristics
which are selectable between inverse definite minimum time (IDMT), or definite time (DT).
The third and fourth overcurrent stages can be set as follows:
I>3 - The third element is fixed as non-directional, for instantaneous or definite time delayed
tripping. This element can be permanently enabled, or enabled only for Switch on to Fault
(SOTF) or Trip on Reclose (TOR). It is also used to detect close-up faults (in SOTF/TOR
tripping logic no timer is applied).
I>4 - The fourth element is only used for stub bus protection, where it is fixed as non-
directional, and only enabled when the opto-input Stub Bus Isolator Open (Stub Bus
Enable) is energised.
All the stages trip three-phase only. (Could be used for back up protection during a VTS
logic)
The following Table shows the relay menu for overcurrent protection, including the available
setting ranges and factory defaults. Note that all tripping via overcurrent protection is three
pole.
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: ......