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Operation
P54x/EN OP/La4
MiCOM P543, P544, P545 & P546
(OP) 5-101
OP
When enabled, the following signals are set by the df/dt logic according to the status of the
monitored function.
df/dt> Inhibit (DDB 592)
-
Inhibit all 4 stages when high
df/dt>1 Tmr. Block (DDB 593)
-
Block timer on 1st stage when high
df/dt>2 Tmr. Block (DDB 594)
-
Block timer on 2nd stage when high
df/dt>3 Tmr. Block (DDB 595)
-
Block timer on 3rd stage when high
df/dt>4 Tmr. Block (DDB 596)
-
Block timer on 4th stage when high
df/dt>1 Start
(DDB 597)
-
1st stage started when high
df/dt>2 Start
(DDB 598)
-
2nd stage started when high
df/dt>3 Start
(DDB 599)
-
3rd stage started when high
df/dt>4 Start
(DDB 600)
-
4th stage started when high
df/dt>1 Trip
(DDB 601)
-
1st stage tripped when high
df/dt>2 Trip
(DDB 602)
-
2nd stage tripped when high
df/dt>3 Trip
(DDB 603)
-
3rd stage tripped when high
df/dt>4 Trip
(DDB 604)
-
4th stage tripped when high
All the above signals are available as DDB signals for mapping in Programmable Scheme
Logic (PSL).
1.39
Special weak infeed logic for stub end transformer terminals
The true weak infeed condition is when no current based protection element is sensitive
enough to operate. This is the case when zero or minimal generation is connected at that
terminal, and the prospective level of fault current flowing through the CT is insufficient for
any forward/reverse protection operation. In such cases, the fault will be cleared using either
POR or Blocking schemes and enabling WI Echo + Trip.
However, there could be a specific configuration as presented in Figure 72 that may not be
detected by relay as a weak infeed condition, even if there is no generation at that end (left
side - relay R2).
Figure 72 Weak infeed configuration on stub-fed radial circuit (parallel line is out
of
service)
The reason is a star earthed transformer which, in case of phase to ground and double
phase to ground faults, imposes a very low zero sequence impedance and almost infinite
positive and negative sequence impedance, i.e. behaving as a source of zero sequence
current only. In such a case, the zero sequence current Io will dominate over I
1
and I
2
at the
weak end, where all three phase currents will approximately equal Io (all in phase and equal
in magnitude). This is true for F1 earth faults at R2, and for F2 earth faults at R1 and R2.
The phase currents will be sufficient to pickup current level detectors in the MiCOM P54x,
and a true weak infeed condition will not be seen as such by the relay.
G
Zs
R1
R2
F1
F2
Summary of Contents for MiCOM P54 Series
Page 2: ......
Page 4: ......
Page 5: ...Safety Section P54x EN SS H11 SS SAFETY SECTION...
Page 6: ...P54x EN SS H11 Safety Section SS...
Page 8: ...P54x EN SS H11 Safety Section SS 2 SS...
Page 16: ...P54x EN IT La4 Introduction MiCOM P543 P544 P545 P546 IT...
Page 18: ...P54x EN IT La4 Introduction IT 1 2 MiCOM P543 P544 P545 P546 IT...
Page 28: ...P54x EN IT La4 Introduction IT 1 12 MiCOM P543 P544 P545 P546 IT...
Page 30: ...P54x EN TD La4 Technical Data MiCOM P543 P544 P545 P546 TD...
Page 58: ...P54x EN GS La4 Getting Started MiCOM P543 P544 P545 P546 GS...
Page 78: ...P54x EN ST La4 Settings MiCOM P543 P544 P545 P546 ST...
Page 172: ...P54x EN ST La4 Settings ST 4 94 MiCOM P543 P544 P545 P546 ST...
Page 174: ...P54x EN OP La4 Operation MiCOM P543 P544 P545 P546 OP...
Page 442: ...P54x EN OP B94 Operation OP 5 270 MiCOM P543 P544 P545 P546 OP...
Page 444: ...P54x EN AP La4 Application Notes MiCOM P543 P544 P545 P546 AP...
Page 534: ...P54x EN PL La4 Programmable Logic MiCOM P543 P544 P545 P546 PL...
Page 538: ...P54x EN PL La4 Programmable Logic PL 7 4 MiCOM P543 P544 P545 P546 PL...
Page 602: ...P54x EN PL La4 Programmable Logic PL 7 68 MiCOM P543 P544 P545 P546 Output Contacts PL...
Page 603: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 69 Output Contacts PL...
Page 606: ...P54x EN PL La4 Programmable Logic PL 7 72 MiCOM P543 P544 P545 P546 PL...
Page 616: ...P54x EN PL La4 Programmable Logic PL 7 82 MiCOM P543 P544 P545 P546 Output Contacts PL...
Page 619: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 85 PL...
Page 620: ...P54x EN PL La4 Programmable Logic PL 7 86 MiCOM P543 P544 P545 P546 PL...
Page 621: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 87 PL...
Page 624: ...P54x EN PL La4 Programmable Logic PL 7 90 MiCOM P543 P544 P545 P546 PL...
Page 629: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 95 Output Contacts PL...
Page 630: ...P54x EN PL La4 Programmable Logic PL 7 96 MiCOM P543 P544 P545 P546 PL...
Page 631: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 97 PL...
Page 633: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 99 PL...
Page 637: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 103 PL...
Page 641: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 107 Output Contacts PL...
Page 642: ...P54x EN PL La4 Programmable Logic PL 7 108 MiCOM P543 P544 P545 P546 Output Contacts PL...
Page 643: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 109 LEDs PL...
Page 644: ...P54x EN PL La4 Programmable Logic PL 7 110 MiCOM P543 P544 P545 P546 PL...
Page 645: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 111 PL...
Page 647: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 113 PL...
Page 653: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 119 Output Contacts PL...
Page 655: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 121 Output Contacts PL...
Page 656: ...P54x EN PL La4 Programmable Logic PL 7 122 MiCOM P543 P544 P545 P546 LEDs PL...
Page 663: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 129 PL...
Page 667: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 133 Output Contacts PL...
Page 669: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 135 Output Contacts PL...
Page 671: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 137 PL...
Page 672: ...P54x EN PL La4 Programmable Logic PL 7 138 MiCOM P543 P544 P545 P546 PL...
Page 676: ...P54x EN PL La4 Programmable Logic PL 7 142 MiCOM P543 P544 P545 P546 PL...
Page 681: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 147 Output Contacts PL...
Page 688: ...P54x EN PL La4 Programmable Logic PL 7 154 MiCOM P543 P544 P545 P546 PL...
Page 689: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 155 PL...
Page 690: ...P54x EN PL La4 Programmable Logic PL 7 156 MiCOM P543 P544 P545 P546 PL...
Page 696: ...P54x EN PL La4 Programmable Logic PL 7 162 MiCOM P543 P544 P545 P546 Output Contacts PL...
Page 698: ...P54x EN PL La4 Programmable Logic PL 7 164 MiCOM P543 P544 P545 P546 PL...
Page 701: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 167 PL...
Page 703: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 169 PL...
Page 704: ...P54x EN PL La4 Programmable Logic PL 7 170 MiCOM P543 P544 P545 P546 PL...
Page 705: ...Programmable Logic P54x EN PL La4 MiCOM P543 P544 P545 P546 PL 7 171 PL...
Page 706: ...P54x EN PL La4 Programmable Logic PL 7 172 MiCOM P543 P544 P545 P546 LEDs PL...
Page 708: ...P54x EN MR La4 Measurements and Recording MiCOM P543 P544 P545 P546 MR...
Page 710: ...P54x EN MR La4 Measurements and Recording MR 8 2 MiCOM P543 P544 P545 P546 MR...
Page 726: ...P54x EN FD La4 Firmware Design MiCOM P543 P544 P545 P546 FD...
Page 748: ...P54x EN CM La4 Commissioning MiCOM P543 P544 P545 P546 CM...
Page 754: ...P54x EN CM La4 Commissioning CM 10 6 MiCOM P543 P544 P545 P546 CM...
Page 874: ...P54x EN MT La4 Maintenance MiCOM P543 P544 P545 P546 MT MT...
Page 876: ...P54x EN MT La4 Maintenance MT 11 2 MiCOM P543 P544 P545 P546 MT...
Page 882: ...P54x EN TS La4 Troubleshooting MiCOM P543 P544 P545 P546 TS...
Page 884: ...P54x EN TS La4 Troubleshooting TS 12 2 MiCOM P543 P544 P545 P546 TS...
Page 894: ...P54x EN SC La4 SCADA Communications MiCOM P543 P544 P545 P546 SC...
Page 928: ...P54x EN SG La4 Symbols and Glossary MiCOM P543 P544 P545 P546 SG...
Page 938: ...P54x EN SG La4 Symbols and Glossary SG 14 10 MiCOM P543 P544 P545 P546 SG...
Page 940: ...P54x EN IN La4 Installation MiCOM P543 P544 P545 P546 IN...
Page 974: ...P54x EN IN La4 Installation IN 15 34 MiCOM P543 P544 P545 P546 IN...
Page 976: ...P54x EN VH La4 Firmware and Service Manual Version History MiCOM P543 P544 P545 P546 VH...
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