Bitronics QTWIE2, Руководство пользователя

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ML0030 August 2009 Copyright 2009 Bitronics, LLC
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1.0 DESCRIPTION
1.1 Introduction
Real and reactive power are essential quantities which must be measured accurately in
order to optimize the control and delivery of electric power. State of the art technology
makes it possible to measure these functions very accurately, over a wide range of input
signals. The Bitronics Three Phase WATT/VAR Meters are rugged electronic instruments
designed for utility and industrial applications requiring reliable, precise measurements of
three-phase real power (WATTs) and/or reactive power (VARs). The family consists of
WATTMETERS, VARMETERS, and WATT/VAR METERS. True RMS measurements are
standard, and include harmonics beyond the 7th harmonic in both the current and voltage
inputs, resulting in accurate measurements, even with distorted waveforms. The use of
"State-of the Art" microprocessor technology assures digital accuracy and repeatability
across the entire range of input signal levels. WATT/VAR meters are modular in design,
with push-button rescaling to display primary values when using any standard current and
voltage transformer. Rescaling can be done in the field, in a matter of minutes, without
removing the instrument from the panel or the need for any calibration equipment. Physical
dimensions are the standard 4" round case with an overall length of 6.5 inches.
1.2 Features
* Simultaneously displays three-phase, true WATTS and/or VARS.
* Push-button rescaling in the field accommodates all ANSI CT and PT ratios.
Displays primary or secondary values. (Non-standard ratios available, consult
factory.)
* Field-changeable modular design for easy maintenance.
* Single push button selects CT/PT setting, and also resets the
microprocessor.
* Non-volatile memory backup of CT/PT settings. No batteries are needed.
* Rugged metal housing fits standard 4" round cutout.
* True RMS measurements are standard.
* 3 1/2 digit high efficiency LEDs for easy reading.
* Standard 0 to +/-1mA DC current outputs proportional to WATTs and/or
VARs, for connecting to SCADA or other equipment. (Two outputs on
QTWIE2 only)
* Watchdog timer maximizes system reliability.