Design of computerized unbalance measuring system

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:433816

Karunakara, K; Nambudiri, P V.V.; Aradhya, S; Kumar, E M; Channakeshava, ^[1]

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1. Central Power Research Inst., Bangalore (India)

In complex network, the connected loads may be of single phase or three phase. Increased trend of traction loads, Arc furnace load and thyristor devices necessitates check for voltage quality. Harmonics, flicker and unbalance are some of the factors influencing the voltage quality. Evaluation of voltage quality and applying correction, if required, are to be made depending upon the situation prevailing in the system. Under certain load conditions like arc furnace, traction and thyristor devices, the unbalance factor may vary every few cycles and for the unbalance correction, devices like static Var compensator (SVC) have to be used. These correcting devices have some time lag to effect corrections, thus measurement based on short time information will not give the true picture. To avoid erroneous conclusions from the short term data, an instrument based on an integrated value over fairly long duration was designed and fabricated by CPRI. This paper discusses about the design and calibration of the instrument and presents typical measured data on an electrical system by using this instrument.

• OSTI ID: 433816
• Report Number(s): CONF-951136--; ISBN 0-7803-2981-3
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
DESIGN
ELECTRIC CONTROLLERS
HARMONICS
MONITORING
POWER SYSTEMS