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D03283R01.10 TESLA LITE User Manual Appendix C-1
Appendix C Glossary
AC Analog Input An ac current or voltage that is obtained from a current transformer or a voltage trans-
former connected to an element on the power system.
AC Analog Summation Configuration of TESLA LITE allows two AC analog quantities to be summed. For exam-
ple, currents from two parallel lines can be summed to produce a set of combined cur-
rents.
COMTRADE Common Format for Transient Data Exchange. IEEE standard C37.111-1991, IEEE
Standard Common Format for Transient Data Exchange (COMTRADE) for Power Sys-
tems, which describes a common format for exchange of recorded power systems data
between different manufacturers’ recorders.
DCE Data Communications Equipment, an RS-232 term for modems and similar equipment.
DCEs generally have a female DB connector.
DST Daylight Savings Time. A seasonal adjustment of time applied in many jurisdictions to
compensate for varying day lengths. Most often, an hour is added to the system time to
begin on the second Sunday in March and end the first Sunday in November.
DTE Data Terminal Equipment, an RS-232 term for a terminal or computer. DTEs generally
have a male DB connector.
DUN Dial-Up Networking, a facility in Windows providing dial-up access to Internet and other
networks. DUN is provided with the Windows distribution.
EIA RS-232C Electronics Industries Association recommended standard 232, revision C, Interface
between Data Terminal Equipment and Data Communication Equipment Employing
Serial Binary Data Interchange. Defines the most popular electrical connection for serial
binary data interchange, available on almost all computer systems.
Element A component in the power system that conveys bulk power within the power system.
Control Panel provides for a naming convention that groups real and calculated channels
with a given element name. Has three voltages and three currents associated with it. For
example, a transmission line, or a transformer.
External Input A contact status brought into TESLA LITE from the outside world. This contact must be
externally wetted with a voltage from 30 to 150 Vdc. Correct polarity must be observed.
IED Intelligent Electronic Device, referring to a power system substation device which com-
munications on a substation network, such as Modbus.
IEEE 1344 IEEE 1344 is an enhancement to the basic IRIG-B time code that embeds information
such as the year, the UTC/local offset (under certain conditions only) and daylight sav-
ings time into the time stream. IEEE standard 1344-95, IEEE Standard for Synchro-
phasors for Power Systems, outlines the implementation and use of accurate time
standards for power systems relaying and recording. Annex F describes an IRIG-B
extension (using previously unused control bits in the signal) which provides extensive
information beyond that of standard IRIG-B.
IRIG-B Inter-Range Instrumentation Group time code format type B, see Range Commanders
Council Telecommunications and Timing Group, IRIG standard 200-95, IRIG Serial Time
Code Formats. Describes an implementation for distribution of precise timing informa-
tion, especially to power systems relays and recorders. IRIG-B is typically provided by a
satellite clock (e.g. GPS or GOES).
Master Recorder A member of a Cooperative Recording Group selected to be the primary interface
between the recorder group and TESLA Control Panel or RecordBase Central Station.
Modbus Modbus is a network using a master/slave protocol often used in power system substa-
tions. Its function was developed and is defined by Modicon, Inc., North Andover, MA,
USA. Refer to Modbus Protocol Reference Guide, Modicon document PI-MBUS-300.
PTI Power Technologies Incorporated