Siemens DTU3005-B Spécifications Page 9
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- Table des matières
- MARQUE LIVRES
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9
Voltage and Current Values
An accurate measurement of voltage supplied by the utility and
the current produced by the connected load is necessary in
identifying power usage and power quality problems.
DC Voltage is either direct current (DC) or alternating current (AC).
DC voltage produces current flow in one direction. DC voltage
can be obtained directly from sources such as batteries and
photocells, which produce a pure DC. DC voltage can also be
produced by applying AC voltage to a rectifier.
Measuring DC Voltage The value of DC voltage varies. Low level DC voltages, such as
5 - 30 VDC, are commonly used in electronic circuits. Higher
levels of DC voltage, such as 500 VDC, can be used in many
industrial applications to control the speed of DC motors. A
voltmeter is used to measure DC voltage.
- Table of Contents 1
- Introduction 2
- Electrical Power Distribution 5
- Voltage and Current Values 9
- Frequency and Harmonics 22
- Power and Power Factor 27
- ACCESS System 37
- WinPM and SIEServe 38
- Local Area Networks 44
- Serial Communication 46
- Power Metering 54
- Power Meter Features 63
- Circuit Breaker Trip Units 68
- S7 I/O Device 74
- Lighting Control System 76
- Review Answers 81
- Final Exam 82
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