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MB30-CS Datasheet(PDF) 91 Page - Mitsubishi Electric Semiconductor |
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MB30-CS Datasheet(HTML) 91 Page - Mitsubishi Electric Semiconductor |
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91 / 105 page  90 Fig. 7.22 MDU Breaker Circuit Diagram (without voltage and electric power measurement) 7.8 MDU Breaker Structure and Motion The MDU breaker is a circuit breaker equipped with the MDU (Measuring Display Unit) which measures and digitally displays electric circuit information. Combining the circuit breaker, CT, VT and measuring display unit, saves space and wiring, allows monitoring of various electric circuits and the energy load conditions. 7.8.1 Measurement (a) Motion As shown in Fig. 7.21, the electric current of each phase is transformed by the primary CT and inputted into the overload relay circuit for an electronic NFB. The electric current is transformed by the secondary CT and sent to the measuring display unit, MDU. Line voltage is converted to a signal in proportion to the voltage signal by resistance, transformed by the VT equivalent CT and inputted into the MDU. The MDU measures and displays by the electric current and voltage signals. Fig. 7.22 shows the internal block diagram of a model without voltage/electric power measuring functions. The frequency detection circuit provides an electric circuit fre- quency for measurement calculation. MDU converts the electric current and volt- age signals from CT and VT into the volt- age signal through the I/V conversion sec- tion. This signal is selected by a multiplexer and digitized at an A/D conversion section for digital calculation by a microcomputer. The CPU performs effective value calcula- tion, demand calculation, electric power cal- culation, electric energy accumulation and harmonic calculation, etc. The items to be measured are load current, line voltage, electric power, electric energy and harmonic current (3rd, 5th, 7th and ALL). It allows easy confirmation of electric circuit conditions and precise and efficient Fig. 7.23 MDU Block Diagram Fig. 7.21 MDU Breaker Circuit Diagram PAL Close-open working part Line side terminal Trip coil VT equivalent CT Open protection circuit Secondary CT Overload relay circuit Overload signal MDU circuit Alarm display section B/NET transmission circuit Fault event cause signal Primary CT Measuring display operation section MDU power circuit MA MB FG Control power Transmission line D N S Load side terminal PAL Close-open working part Line side terminal Trip coil Secondary CT Overload relay circuit Overload signal MDU circuit Frequency detecting circuit Alarm display section B/NET transmission circuit Fault event cause signal Primary CT Measuring display operation section MDU power circuit MA MB FG Control power Transmission line D N S Load side terminal Open protection circuit I/V conversion section Constant voltage circuit Control power Current input Voltage input Alarm I/V conversion section I/V conversion section I/V conversion section I/V conversion section I/V conversion section I/V conversion section Input section Multiplexer MA MB Operation/setup section Microcomputer Segment LED display section Alarm LED display section CPU A/D conversion section |
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