POWER SYSTEM MEASUREMENT

The accurate measurement of the voltage, current or other parameter of a power system is a prerequisite to any form of control, ranging from automatic closed-loop control to the recording of data for statistical purposes. Measurement of these parameters can be accomplished in a variety of ways, including the use of direct-reading instruments as well as electrical measuring transducers. Transducers produce an accurate d.c. analogue output, usually a current, which corresponds to the parameter being measured (the measurand). They provide electrical isolation by transformers, sometimes referred to as ‘Galvanic Isolation’, between the input and the output. This is primarily a safety feature, but also means that the cabling from the output terminals to any receiving equipment can be light weight and have
a lower insulation specification. The advantages over discrete measuring instruments are as follows:
a. mounted close to the source of the measurement, reducing instrument transformer burdens and increasing safety through elimination of long wiring runs
b. ability to mount display equipment remote from transducer
c. ability to use multiple display elements per transducer
d. the burden on CT’s/VT’s is considerably less
Outputs from transducers may be used in many ways – from simple presentation of measured values for an
operator, to being utilised by a network automation scheme to determine the control strategy.


FOLLOWING FILE CONTAINS POWER SYSTEM MEASUREMENT MAJORS 
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