Introduction To The Ur Plus -Series - GE D90 Plus Instruction Manual

Plus
INTRODUCTION TO THE UR
Introduction to the UR
2
-SERIES
– GE EnerVista CD (includes software and documentation).
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please visit the GE Multilin website at http://gegridsolutions.com/multilin.
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please contact GE Multilin immediately.
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GE Grid Solutions
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Canada L6C 0M1
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Historically, substation protection, control, and metering functions were performed with
electromechanical equipment. This first generation of equipment was gradually replaced
by analog electronic equipment, most of which emulated the single-function approach of
their electromechanical precursors. Both of these technologies required expensive cabling
and auxiliary equipment to produce functioning systems.
Recently, digital electronic equipment has begun to provide protection, control, and
metering functions. Initially, this equipment was either single function or had very limited
multi-function capability, and did not significantly reduce the cabling and auxiliary
equipment required. However, recent digital relays have become quite multi-functional,
reducing cabling and auxiliaries significantly. These devices also transfer data to central
control facilities and human-machine interfaces using electronic communications. The
functions performed by these products have become so broad that many users now prefer
the term IED (Intelligent Electronic Device).
It is obvious to station designers that the amount of cabling and auxiliary equipment
installed in stations can be even further reduced, to 20 to 70% of the levels common in
1990, to achieve large cost reductions. This requires placing even more functions within
the IEDs.
Users of power equipment are also interested in reducing cost by improving power quality
and personnel productivity, and as always, in increasing system reliability and efficiency.
These objectives are realized through software which is used to perform functions at both
the station and supervisory levels. The use of these systems is growing rapidly.
High speed communications are required to meet the data transfer rates required by
modern automatic control and monitoring systems. In the near future, very high speed
communications will be required to perform protection signaling with a performance
target response time for a command signal between two IEDs, from transmission to
reception, of less than 3 milliseconds. This has been established by the IEC 61850 standard.
IEDs with the capabilities outlined above will also provide significantly more power system
data than is presently available, enhance operations and maintenance, and permit the use
of adaptive system configuration for protection and control systems. This new generation
of equipment must also be easily incorporated into automation systems, at both the
station and enterprise levels. The GE Multilin Advanced Universal Protection System
Plus
(UR -series) has been developed to meet these goals.
Plus
-series
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED