10
Introduction to the technical reference manual
Chapter 1
Introduction
INAMPL
Present magnitude of residual current
INSTMAGN
Magnitude of instantaneous value
INSTNAME
Instance name in signal matrix tool
IOM
Binary Input/Output module
IPOSIM
Imaginary part of positive sequence current
IPOSRE
Real component of positve sequence current
IP 20
Enclosure protects against solid foreign objects 12.5mm in diameter and
larger but no protection against ingression of liquid according to
IEC60529. Equivalent to NEMA type 1.
IP 40
Enclosure protects against solid foreign objects 1.0mm in diameter or
larger but no protection against ingression of liquid according to
IEC60529.
IP 54
Degrees of protection provided by enclosures (IP code) according to
IEC 60529. Dust protected. Protected against splashing water. Equiva-
lent to NEMA type 12.
Ip>block
Block of the function at high phase current in percentage of base
IRVBLK
Block of current reversal function
IRV
Activation of current reversal logic
ITU
International Telecommunications Union
k2
Time multiplier in IDMT mode
kForIEEE
Time multiplier for IEEE inverse type curve
LAN
Local area network
LIB 520
LCD
Liquid chrystal display
LDCM
Line differential communication module
LDD
Local detection device
LED
Light emitting diode
LNT
LON network tool
LON
Local operating network
MAGN
Magnitude of deadband value
MCB
Miniature circuit breaker
MCM
Mezzanine carrier module
MIM
Milliampere Input Module
MIP
MPPS
MPM
Main processing module
MV
Medium voltage
Summary of Contents for REL 551-C1*2.5
Page 1: ...Technical reference manual ProtectIT Line differential protection terminal REL 551 C1 2 5 ...
Page 23: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Page 39: ...30 Technical data Chapter 2 General ...
Page 63: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Page 71: ...62 Line differential protection phase segregated DIFL Chapter 4 Line differential protection ...
Page 89: ...80 Thermal phase overload protection THOL Chapter 5 Current ...
Page 101: ...92 Event function EV Chapter 7 Logic ...
Page 163: ...154 Terminal diagrams Chapter 11 Diagrams Figure 39 REL 551 C1 with DC switch ...