P746/EN SG/F21
Symbols and Glossary
(SG) 14-
4
MiCOM
P746
SG
Symbols
Explanation
IDMT
Inverse definite minimum time:
A characteristic whose trip time depends on the measured input (e.g. current) according
to an inverse-time curve.
IDN>1
Minimum pick-up neutral circuitry fault threshold.
IDN>2
Minimum pick-up differential neutral element for all the zones.
IDNCZ>2
Minimum pick-up differential neutral element for the Check Zone.
IDZ
Minimum pick-up differential neutral element for the Check Zone.
IED
Intelligent Electronic Device:
For example a MiCOM relay
In
The rated nominal current of the relay:
Software selectable as 1 amp or 5 amps to match the line CT input.
IN
Neutral current, or residual current:
This results from an internal summation of the three measured phase currents.
IN>
A neutral (residual) overcurrent element:
Detects earth/ground faults.
IN>1
First stage of ground overcurrent protection:
Could be labelled 51N-1 in ANSI terminology.
IN>2
Second stage of ground overcurrent protection:
Could be labelled 51N-2 in ANSI terminology.
IN>BB
Minimum pick-up neutral threshold for the local trip order confirmation.
IN>DZ
Minimum pick-up neutral threshold for the Dead Zone protection.
Inh
An inhibit signal.
Inst.
An element with “instantaneous” operation:
i.e. having no deliberate time delay.
ISEF>
Sensitive earth fault overcurrent element.
K1
Slope of the phase circuitry fault function.
K2
Slope of the differential phase element for all the zones.
KCZ
Slope of the differential phase element for the Check Zone.
KN1
Slope of the neutral circuitry fault function.
KN2
Slope of the differential neutral element for all the zones.
KNCZ
Slope of the differential neutral element for the Check Zone.
KZN
The residual compensation factor:
Ensuring correct reach for ground distance elements.
LCD
Liquid crystal display:
The front-panel text display on the relay.
LD
Abbreviation of “Level Detector”:
An element responding to a current or voltage below its set threshold.
LED
Light emitting diode:
Bicolour:
Red/black or green/black or orange/black indicator on the relay front-panel.
Tricolour:
Red/orange/green/black indicator on the relay front-panel.
MCB
A “miniature circuit breaker”:
Used instead of a fuse to protect VT secondary circuits.
Summary of Contents for MiCOM P746
Page 4: ......
Page 5: ...Pxxx EN SS G11 SAFETY SECTION...
Page 6: ......
Page 8: ...Pxxx EN SS G11 Page 2 8 Safety Section BLANK PAGE...
Page 16: ...P746 EN IT G31 Introduction MiCOM P746...
Page 18: ...P746 EN IT G31 Introduction IT 1 2 MiCOM P746 IT BLANK PAGE...
Page 26: ...P746 EN TD G31 Technical Data MiCOM P746...
Page 38: ...P746 EN GS G31 Getting Started MiCOM P746...
Page 78: ...P746 EN ST G31 Getting Started MiCOM P746...
Page 80: ...P746 EN ST G31 Settings ST 4 2 MiCOM P746 ST BLANK PAGE...
Page 112: ...P746 EN ST G31 Settings ST 4 34 MiCOM P746 ST BLANK PAGE...
Page 114: ...P746 EN OP G31 Operation MiCOM P746...
Page 136: ...P746 EN OP G31 Operation OP 5 22 MiCOM P746 OP BLANK PAGE...
Page 138: ...P746 EN AP G31 Application Notes MiCOM P746...
Page 142: ...P746 EN AP G31 Application Notes AP 6 4 MiCOM P746 AP BLANK PAGE...
Page 194: ...P746 EN AP G31 Application Notes AP 6 56 MiCOM P746 AP BLANK PAGE...
Page 196: ...P746 EN PL G31 Programmable Logic MiCOM P746...
Page 238: ...P746 EN MR A11 Measurements and Recording MiCOM P746...
Page 240: ...P746 EN MR A11 Measurements and Recording MR 8 2 MiCOM P746 MR BLANK PAGE...
Page 258: ...P746 EN FD G31 Firmware Design MiCOM P746...
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Page 348: ...P746 EN MT A11 Maintenance MiCOM P746...
Page 350: ...P746 EN MT A11 Maintenance MT 11 2 MiCOM P746 MT BLANK PAGE...
Page 364: ...P746 EN MT A11 Maintenance MT 11 16 MiCOM P746 MT BLANK PAGE...
Page 366: ...P746 EN TS G31 Troubleshooting MiCOM P746...
Page 368: ...P746 EN TS G31 Troubleshooting TS 12 2 MiCOM P746 TS BLANK PAGE...
Page 382: ...P746 EN SC G31 SCADA Communications MiCOM P746...
Page 424: ...P746 EN SC G31 SCADA Communications SC 13 42 MiCOM P746 SC BLANK PAGE...
Page 426: ...P746 EN SG F21 Symbols and Glossary MiCOM P746...
Page 438: ......
Page 440: ...P746 EN IN G31 Installation IN 15 2 MiCOM P746 IN BLANK PAGE...
Page 468: ......
Page 470: ...P746 EN HI G31 Remote HMI HI 16 2 MiCOM P746 HI BLANK PAGE...
Page 500: ...P746 EN HI G31 Remote HMI HI 16 32 MiCOM P746 HI BLANK PAGE...
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Page 504: ...P746 EN CS A11G31 Cyber Security CS 17 2 MiCOM P746 CS BLANK PAGE...
Page 524: ...P746 EN VH G31 Firmware and Service Manual Version History MiCOM P746...
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