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PIC18F2520 MCP3909 3-Phase Energy Meter Reference Design - Meter Test Results and Adapting the Meter Design for other Requirements
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PIC18F2520 MCP3909 3-Phase Energy Meter Reference Design - Meter Test Results and Adapting the Meter Design for other Requirements
 
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PIC18F2520 MCP3909 3-Phase Energy Meter Reference Design - Meter Test Results and Adapting the Meter Design for other Requirements
From Microchip Technology, Inc.
 

 

AN1151 Meter CalibrationMICROCHIP’S DEMO BOARD CALIBRATION VS. PROPER METER Each phase was calibration sequentially, starting with CALIBRATION phase A. (Note 2) stepEach phase calibration process was a 4 It is important to note Microchip does not do a full cali- calibration. The steps are shown here with approximate bration/test on each meter that we ship as demo calibration times (using 128 line cycle accumulation at boards. Steps have been taken to ensure you receive 50 Hz) an energy meter ‘out of the box’ that performs to the above meter specifications, but the equipment and GAIN (5A, 220V) - 2.5 seconds (Note 1) process we use during demo board production is not DELAY (5A, 220V, PF = 0.5L) - 2.5 seconds (Note 1) true energy calibration equipment, and any testing will OFFSET for active power reflect this. (0.005A, 220V, PF = 1) - 2.5 2.5 seconds (Note 1) The results shown here were taken from a shipped OFFSET for I (0.5A, 220V, PF=1) - 2.5 seconds RMSenergy meter that was simply ‘re-calibrated’ using the (Note 1, Note 2) Fluke electrical power standard and the calibration Note 1: Important! The approach to calibration software GUI that comes with the kit. No hardware used by the PIC18F2520 firmware and ‘tweaks’, or firmware changes were done, only a true Windows GUI (“energy meter software”), calibration using accurate energy meter calibration does not require accumulation of active equipment. power pulses to generate errors and resulting calibration correction factors for Calibration used for this Application Note the meter. Instead, the software allows Figure 2 describes the calibration and test setup used. user input of the true current and voltage The electrical power standard (Fluke 6100A) was at each calibration step. The correction configured to generate balanced loads for the meter, factors are then calculated by comparing for all calibration steps.3xI this ideal to the measured active power CAL after N line cycles, 128 line cycles in the results shown here. This approach greatly Power Meter reduces meter production time. Inputs 2: This fourth calibration step can be +0° LINE skipped for active power only meters as it only applies to the RMS measurement. LOAD Total Energy When the meter is shipped the configuration of the +120° output pulse is set such that the pulse frequency is LINE proportional to the total active energy being consumed across all 3 phases. During meter calibration however, LOAD the firmware and software work together to ensure that ‘phase to phase matching’ is included. When calibrat- ing all 3 phases, one of the phases is selected (nor- mally Phase A) as the ‘reference or ‘standard’ phase, +240° and the other phases, when accumulating energy LINE during the gain calibration step, or step 1, compare their accumulation to that recorded during phase A, LOAD thus phase to phase matching is included. For equations and signal flow, see the MCP3909 3-Phase Energy Meter Reference Design using PIC18F2520neutral User’s Guide, (DS51643). ©Fluke Corporation FIGURE 2: Meter Calibration Setup. DS01151A-page 2 © 2007 Microchip Technology


Products & Services
Power meters and wattmeters are used for high-accuracy measurements of power over a wide-frequency bandwidth, and from both AC and DC circuits.
BTU meters measure the energy changes in liquid or gas flows in British thermal units (BTU).
Harmonic distortion and phase meters are instruments that measure harmonic distortion or phase position.
Calibration management software is used to generate documentation of calibration results, calibration certificates and reports. It also provides lookups of calibration procedures and database functions.
Phase meters (phase testers, phase rotation meters) check the phase sequence and phase orientation in three-phase electrical systems.
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Product Announcements
Hsiang Cheng Electric Corp. - 3 Phase KWH Meter Test Benches
PTC 8320D three phase energy auto-calibration system is used to test both single / 3 phase energy meter (up to class 0.2%). This bench is using the aluminum compound configuration to form with digital... (read more)
Hsiang Cheng Electric Corp. - Three Phase KWH Meter Test Bench
PTC 8320D three phase energy auto-calibration system is used to test both single / 3 phase energy meter (up to class 0.2%). This bench is using the aluminum compound configuration to form with digital... (read more)
Hsiang Cheng Electric Corp. - Single phase energy meter
5410-N single-phase static energy meter is designed by using special large-scale integrated circuit (IC). This 5410-N is having the great features of high reliability, low power consumption and long... (read more)
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The Fluke 725 Multifunction Process Calibrator is a powerful, yet easy-to-use field calibrator. Use the measure and source functions to test and calibrate almost any process parameter. (read more)
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The Fluke 1735 Power Logger is the ideal electrician or technician's tool for conducting energy studies and basic power quality logging. Set up the Fluke 1735 in seconds, with the included flexible... (read more)
Hsiang Cheng Electric Corp. - Taiwan made Power meter HC6030
The Hsaiang Cheng's multifunction power quality transducer has been used world wide in many utility systems and substation systems to monitor the quality of power. For years, Hsaiang Cheng has always... (read more)
The Hsaiang Cheng's multifunction power quality meter has been used world wide in many utility systems and substation systems to monitor the quality of power. For years, Hsaiang Cheng has always... (read more)
Fotronic Corporation / Test Equipment Depot - Fluke 435 3-Phase Logging Power Quality Analyzer
The Fluke 435 3-phase power quality analyzers help you troubleshoot problems in three and single-phase power distribution systems. Troubleshooting is faster with on-screen display of trends and... (read more)
Fotronic Corporation / Test Equipment Depot - Fluke 434 3-Phase Power Quality Analyzers
The Fluke 434/003 three-phase power quality analyzers help you locate, predict, prevent and troubleshoot problems in power distribution systems. These easy-to-use handheld tools have many innovative... (read more)
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Quickly troubleshoot power quality issues with the easy-to-use combination of a power quality meter, current clamp, and data logger... (read more)
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Topics of Interest
The MCP3905/6 energy-monitoring Integrated Circuits (ICs) supply active real power measurements for single-phase residential meter designs. These devices include features specific for the... (Read More)
The material in this subsection is framed in terms of three-phase (q=3) machine theory, but it is actually generalizable to an arbitrary number of phases. Suppose a machine whose three-phase... (Read More)
AN1106 Power Factor Correction in Power Conversion Applications ® Using the dsPIC DSC The low cost and high performance capabilities of the Author: Vinaya Skanda DSC, combined with a wide variety of... (Read More)
The next important set of parameters to compute are the d- and q-axis inductances of the machine. Considered are three separate cases, the winding-in-slot, surface magnet case which is magnetically... (Read More)
This application note shows how to use a PIC16C923 microcontroller to control operation of the CS5460 power measurement integrated circuit from Cirrus Logic ® /Crystal Power Measurement, to drive a... (Read More)
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