Settings
P74x/EN ST/Na7
MiCOM P741, P742, P743
(ST) 4-
21
ST
Menu Text
Default Setting
Setting Range
Step Size
Min.
Max.
Ι
N
>1 Current Set
0.30*
Ι
n
0.10*
Ι
n
32.00*
Ι
n
0.01*
Ι
n
Pick-up setting for the first stage earth fault element.
Ι
N
>1 Time Delay
1.00s
0.00s
100.00s
0.01s
Time-delay setting for the first stage definite time element.
Ι
N
>1 TMS
1.000
0.025
1.200
0.025
Setting for the time multiplier setting to adjust the operating time of the IEC IDMT
characteristic.
Ι
N
>1 Time Dial
7.0
0.5
15.0
0.1
Setting for the time multiplier setting to adjust the operating time of the IEEE/US IDMT
curves.
Ι
N
>1 Reset Char
DT
DT/Inverse
Setting to determine the type of reset/release characteristic of the IEEE/US curves.
Ι
N
>1tReset
0.0
0.0
100.0
0.1
Setting to determine the reset/release time for definite time reset characteristic.
Ι
N
>2 Function
Disabled
Disabled / 87BBP&N blocking / High Set I>2 / I>2 &
87BBP&N / 87BB/P blocking / 87BB/N blocking /
I>2 & 87BB/P / I>2 & 87BB/N
Setting to enable or disable the second stage definite time element. If the function is
disabled, then all associated settings with the exception of this setting, are hidden.
The overcurrent can be used as high set overcurrent, to block the 87BB protection for
phase and earth fault element (87BBO&N blocking) , only the 87BB phase element
(87BB/P blocking), only the 87BB SEF element (87BB/N blocking), or a combination of the
different functions
Ι
N
>2 Current Set
20.00*
Ι
n
0.10*
Ι
n
32.00*
Ι
n
0.01*
Ι
n
Pick-up setting for the second stage earth fault element.
Ι
N
>2 Time Delay
1.00s
0.00s
10.00s
0.01s
Setting for the operating time delay for the second stage earth fault element.
Block Drop-Off
0.3s
0.2s
6s
0.1s
Adjust the differential busbar protection (87BB) blocking function during drop-off time from
200ms to 6s.
1.2.7
Circuit breaker fail and undercurrent function (“CB Fail” column – P742/P743)
This function consists of two-stage circuit breaker fail functions that can be initiated by:
•
Internal protection element initiation.
•
External protection element initiation.
For current-based protection, the reset condition is based on undercurrent operation to
determine that the CB has opened. For the non-current based protection, the reset criteria
may be selected by means of a setting for determining a CB Failure condition.
It is common practice to use low set undercurrent elements in protection relays to indicate
that circuit breaker poles have interrupted the fault or load current, as required.
Summary of Contents for P741
Page 2: ......
Page 4: ......
Page 6: ...P74x EN IT Na7 Introduction MiCOM P741 P742 P743 ...
Page 8: ...P74x EN IT Na7 Introduction IT 1 2 MiCOM P741 P742 P743 IT ...
Page 18: ...P74x EN TD Na7 Technical Data MiCOM P741 P742 P743 ...
Page 30: ...P74x EN TD Na7 Technical Data TD 2 14 MiCOM P741 P742 P743 TD ...
Page 32: ...P74x EN GS Na7 Getting Started MiCOM P741 P742 P743 ...
Page 70: ...P74x EN ST Na7 Getting Started MiCOM P741 P742 P743 ...
Page 72: ...P74x EN ST Na7 Settings ST 4 2 MiCOM P741 P742 P743 ST ...
Page 116: ...P74x EN OP Na7 Operation MiCOM P741 P742 P743 ...
Page 120: ...P74x EN OP Na7 Operation OP 5 4 MiCOM P741 P742 P743 OP ...
Page 136: ...P74x EN OP Na7 Operation OP 5 20 MiCOM P741 P742 P743 OP FIGURE 8 CB FAIL LOGIC ...
Page 166: ...P74x EN AP Na7 Application Notes MiCOM P741 P742 P743 ...
Page 234: ...P74x EN PL Na7 Programmable Logic MiCOM P741 P742 P743 ...
Page 290: ...P74x EN PL Na7 Programmable Logic PL 7 56 MiCOM P741 P742 P743 PL ...
Page 291: ...Programmable Logic P74x EN PL Na7 MiCOM P741 P742 P743 PL 7 57 PL ...
Page 292: ...P74x EN PL Na7 Programmable Logic PL 7 58 MiCOM P741 P742 P743 PL ...
Page 294: ...P74x EN PL Na7 Programmable Logic PL 7 60 MiCOM P741 P742 P743 PL ...
Page 295: ...Programmable Logic P74x EN PL Na7 MiCOM P741 P742 P743 PL 7 61 PL ...
Page 296: ...P74x EN PL Na7 Programmable Logic PL 7 62 MiCOM P741 P742 P743 PL ...
Page 298: ...P74x EN PL Na7 Programmable Logic PL 7 64 MiCOM P741 P742 P743 PL ...
Page 299: ...Programmable Logic P74x EN PL Na7 MiCOM P741 P742 P743 PL 7 65 PL ...
Page 300: ...P74x EN PL Na7 Programmable Logic PL 7 66 MiCOM P741 P742 P743 PL ...
Page 302: ...P74x EN MR Na7 Measurements and Recording MiCOM P741 P742 P743 ...
Page 324: ...P74x EN FD Na7 Firmware Design MiCOM P741 P742 P743 ...
Page 344: ...P74x EN FD Na7 Firmware Design FD 9 20 MiCOM P741 P742 P743 FD FIGURE 10 P74x SYSTEM OVERVIEW ...
Page 351: ...Firmware Design P74x EN FD Na7 MiCOM P741 P742 P743 FD 9 27 FD ...
Page 353: ...P74x EN CM Na7 Commissioning MiCOM P741 P742 P743 ...
Page 429: ...P74x EN MT Na7 Maintenance MiCOM P741 P742 P743 ...
Page 431: ...P74x EN MT Ma7 Maintenance MT 11 2 MiCOM P741 P742 P743 MT ...
Page 451: ...P74x EN TS Na7 Troubleshooting MiCOM P741 P742 P743 ...
Page 453: ...P74x EN TS Na7 Troubleshooting TS 12 2 MiCOM P741 P742 P743 TS ...
Page 475: ...P74x EN SC Na7 SCADA Communications MiCOM P741 P742 P743 ...
Page 499: ...P74x EN SC Na7 SCADA Communications SC 13 24 MiCOM P741 P742 P743 SC ...
Page 501: ...P74x EN SG Na7 Symbols and Glossary MiCOM P741 P742 P743 ...
Page 511: ...P74x EN SG Na7 Symbols and Glossary SG 14 10 MiCOM P741 P742 P743 SG Logic Gates ...
Page 513: ...P74x EN IN Na7 Installation MiCOM P741 P742 P743 ...
Page 515: ...P74x EN IN Na7 Installation IN 15 2 MiCOM P741 P742 P743 IN ...
Page 528: ...Installation P74x EN IN Na7 MiCOM P741 P742 P743 IN 15 15 IN FIGURE 6 P742 40TE REAR VIEW ...
Page 533: ...P74x EN VH Na7 Firmware and Service Manual Version History MiCOM P741 P742 P743 ...
Page 542: ...APPENDIX A WIRING DIAGRAMS ...
Page 543: ...Appendix A Wiring Diagrams P74x P74x EN M Na7 ...
Page 559: ......