71M Phase Energy Meter IC

Transcription

1 AVAILABLE 71M Phase Energy Meter IC APPLICATION NOTE AN_6513_25 FEBRUARY 26 Introduction The Teridian 71M6513 device has been evaluated to provide metering compliance tests for accuracy and performance as per IEC and ANSI standards. Test titles are all based on the standard test titles for easy understanding. The compliance tests that have not been performed are more limited to the enclosure and the meter manufacturers production issues and not based on the IC itself. Test Plans and Tools Used The Teridian 71M6513 demonstration boards have been used along with the calibration test equipment by Rotek and Weco Engineering for meter performance and accuracy testing. Temptronic thermal stream equipment and Tenney temperature chambers have been used to test and verify temperature performance as per IEC 6253 part1 1 and part 22 and ANSI C12.2 class.2. Power consumption: Circuit Type ANSI/IEC Standard 6513 demo board Voltage circuit 2 W or 1VA 3mW Current circuit 5VA <2.4VA Starting Current The starting current for measurement is really up to the current sensor's capability and as well the MPU firmware design thru the CREEP register provided on our demo code. For example, with a shunt meter that can measure 125A to.1a with.2% accuracy, can also measure 1mA of current. The minimum analog input voltage for having a bit of information change is 357 nanovolts. Also, one has to be careful of not sensing noise. 1

2 Summary of 71M6513 demo board performance with and without calibration. step element volt amp phase_angle No_calibration Calibration 1 A A A A A A B B B B B B C C C C C C S S S S S S S S S S

3 24V test with and without calibration: step volt amp No_calibration Calibration Calibration performance No_Calibration After_Calibration

4 Power Factor variation test 71M6513 all phase angle performance step volt amp freq Test1_ Test2_ Test1_6 Test2_6 Test1_3 Test2_3 Test1_18 Test2_ M6513_WattHour_All_phase angle_performance Test1_Phase Test2_phase Test1_phase6 Test2_Phase6 Test1_Phase3 Test2_Phase3 Test1_Phase18 Test2_Phase18-1 4

5 Voltage Variation Test 71M V voltage variation test step amp 24V 216V 264V 288V 192V M6513_24_Voltage_variation V 216V 264V 288V 192V 5

6 71M V 6Hz voltage variation testing step amp 12V 18V 132V 144V 96V Voltage_Variation_12V V 18V 132V 144V 96V 6

7 71M6513 5Hz Voltage variation test step Amp 12V 18V 132V 144V 96V V_5Hz Voltage Variation Performance V 18V 132V 144V 96V

8 Varhour Performance 71M V 6Hz Varhour test performance step Amp Test1_Phase Test2_Phase Test1_Phase-6 Test2_Phase Test1_Phase6 Test2_Phase6 Test1_Phase18 Test2_Phase M6513_Varhour_24V_performance Test1_Phase Test2_Phase Test1_Phase-6 Test2_Phase-6 Test1_Phase6 Test2_Phase6 Test1_Phase18 Test2_Phase18-1 8

9 Frequency variation Test 71M6513 Variation of Frequency: Phase_Angle step amp Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz M6513_performance_24_Phase_angle_at_frequencies_47Hz to 63Hz Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz -.5 9

10 Phase_angle 6 step amp Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz _performance_24_phase_angle6_at_frequencies_47Hz to 63Hz Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz 1

11 Phase_angle 3 step amp Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz _24_Phase_Angle3_at_frequencies_47Hz to 63Hz Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz

12 Phase_angle 18 step amp Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz _24_Phase_Angle18_at_Frequencies_47Hz to 63Hz Test1_63Hz Test2_63Hz Test1_6Hz Test2_6Hz Test1_57Hz Test2_57Hz Test1_53Hz Test2_53Hz Test1_5Hz Test2_5Hz Test1_47Hz Test2_47Hz

13 Varhour Frequency variation test for various phase angles Phase_Angle step volt amp Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_ Varhour_Phase_Frequency_Performance Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_63 13

14 Phase_Angle6 step volt amp Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_ Varhour_Phase6_Frequency_Performance Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_63 14

15 Phase_Angle-6 step volt amp Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_ Varhour_Phase_-6_Frequency_Performance Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_63 15

16 Phase_Angle18 step volt amp Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_ Varhour_Phase18_Frequency_Performance Freq_47 Freq_5 Freq_53 Freq_57 Freq_6 Freq_63 16

17 Accumulation interval variation Watthour Performance with Sum Cycles (Accumulation Interval) step amp Acc_Int_2ms Acc_Int_25ms Acc_Int_5ms Acc_Int_75ms Acc_Int_1ms Watthour_performance_Accucmulation_Interval Current(Amps) Acc_Int_2ms Acc_Int_25ms Acc_Int_5ms Acc_Int_75ms Acc_Int_1ms 17

18 Harmonic Performance Harmonic performance was tested with the Rotek calibrator. The signals supplied by the Rotek have been measured for the amount of distortion contained using a spectrum analyzer. The distortion current and voltage amplitudes were introduced at various harmonic frequencies of both the 5 and 6Hz fundamental frequencies of operation. Results are provided below for both tests: Harmonic performance results are provided for both 5Hz and 6Hz fundamental to the 25 th harmonic at 5Hz and up to the 21 st harmonic at 6Hz. Both measurements were performed at 24VAC and 3A. The current distortion amplitude was 4% in both tests; the voltage distortion amplitude was 1% in both tests. The results are listed in the tables below: Current Distortion Amplitude [%] Voltage Distortion amplitude [%] V A f [Hz] Harmonic of 5Hz Result Accuracy (%)

19 V A Harmonic of 6Hz f [Hz] Result Accuracy (%) The meter performance is depicted in the figures that follow: 19

20 Meter performance over Harmonics -- %Error Error(%) Harmonic 5Hz Harmonic data 6Hz Harmonic Data Performance_till_19thHarmonic Error(%) Harmonic 5Hz_18thHarmonic 6Hz_18thHarmonic 2

21 Variation of Temperature Linearity Test over Temperature Linearity was tested over temperature using the available thermal stream equipment and three different chips. Parts were tested with and without temperature compensation. The mathematical compensation for performance is achieved using Compute Engine Firmware. All the results provided are compensated temperature performance. The test results for the 71M6513 are listed in the table below: step element V A phase angle f -5C -4C 55C 25C 85C 1 S S S S S S S S S The test results for chip #1 are shown in graphical form in the figure below: Linearity Test with Temperature 1.5 Error(%) Current(Amps) -5C Linear -4C linear 25C linear 55C linear 85C linear 21

22 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated 16 Rio Robles, San Jose, CA USA Maxim Integrated The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.