ABB REL670 Operator's Manual page 114

Section 15
Glossary
108
specifications from the PCI SIG (Special Interest Group) for the
electrical EMF Electro Motive Force.
IED Intelligent electronic device
I-GIS Intelligent gas insulated switchgear
Instance When several occurrences of the same function are available in
the IED they are referred to as instances of that function. One
instance of a function is identical to another of the same kind but
will have a different number in the IED user interfaces. The
word instance is sometimes defined as an item of information
that is representative of a type. In the same way an instance of a
function in the IED is representative of a type of function.
IP 1. Internet protocol. The network layer for the TCP/IP protocol
suite widely used on Ethernet networks. IP is a connectionless,
best-effort packet switching protocol. It provides packet routing,
fragmentation and re-assembly through the data link layer.
2. Ingression protection according to IEC standard
IP 20 Ingression protection, according to IEC standard, level
IP20- Protected against solidforeign objects of12.5mm diameter
andgreater.
IP 40 Ingression protection, according to IEC standard, level IP40-
Protected against solid foreign objects of 1mm diameter and
greater.
IP 54 Ingression protection, according to IEC standard, level
IP54-Dust-protected,protected againstsplashing water.
IRF Internal fail signal
IRIG-B: InterRange Instrumentation Group Time code format B, standard
200
ITU International Telecommunications Union
LAN Local area network
LIB 520 High voltage software module
LCD Liquid crystal display
LDD Local detection device
LED Light emitting diode
MCB Miniature circuit breaker
MCM Mezzanine carrier module
MVB Multifunction vehicle bus. Standardized serial bus originally
developed for use in trains.
1MRK506276-UUS B
Operator's manual