Some standard content:
AC Energy Meter (Electricity Meter) Verification Regulation J3G:307-1988
AC Energy Meter [Electricity Meter] Verification Regulation of AienimtingCurrentWatt-hourMeters
JJG 3UT—1988
Replace JJG 307—1982
This regulation was approved by the National Metrology Bureau on June 28, 1980, and was implemented on April 21, 1989. The responsible unit is: Liaoning Provincial Bureau of Measurement
Drafting unit: Northeast Electric Power Testing Institute The technical provisions of this regulation are drafted by the drafting unit. The main drafters of this regulation are:
Yonglin (Northeast Electric Power Testing Institute)
Technical requirements
Verification conditions,
Verification objectives
Determination method
Verification conclusion processing and verification period
Appendix Standard instruments used in electric energy meter control equipment Appendix 2 Characteristic diagram and connection coefficient.
Appendix 3 Calculation formula of power attenuation and actual power 4 Evaluation method of power verification accuracy||tt ||Appendix 5 Measurement data quantification method
Appendix 6
“Verification results are reported to the user” Verification procedures for AC watt-hour meters
This regulation is applicable to the verification of newly produced, after-sales and in-use AC active and reactive watt-hour meters with a rated frequency of 50H or 60H.
This regulation is not applicable to:
Measured watt-hour meters:
Quantitative watt-hour meters;
Reverse measurement watt-hour meters:
Installed computers
Reactive power meters
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Pre-paid electricity meter:
Multi-rate energy meter;
Apparent power energy meter:
Other special energy meters:
Technical basis requirements
1 Punctuation
The mark on the inspected energy meter shall comply with the provisions of the relevant technical conditions of the national standards 2 This error
2.1 The basic error limit of the installed active and passive energy meters shall not exceed 1 and 2 provisions. 37G
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Table 2 Unbalanced P-type three-phase active and reactive power with fear of basic error with the group of active
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In 3-phase single-phase electric meter with 3-phase electric meter, the basic limit of the meter is the positive charge power and the accuracy of the three-phase electric meter.
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The basic error limit of the portable electric energy meter shall not exceed the requirements of Table 3 and Table 4: u.5
Under the conditions of rated frequency and rated current, the portable electric energy meter only measures an electric energy value of not less than 5 times 377
(the measurement does not need to be re-tested), and the standard error estimate S () for evaluating the accuracy and repeatability is obtained, which shall not exceed the requirements of Table 5. The portable electric energy meter shall check the standard response of the measurement result. The estimated value of a
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at rated voltage, rated power 08-[.0 (for dynamic meter) or =1. center (for non-zoned energy meter conditions, when the load convex current does not exceed the provisions of Table 6, the energy meter dial degree connected through the rotation table 6 Allowable starting current value
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when the current line has no negative current and the voltage line is added to the rated voltage of the coupon (the rated voltage of the phase electric energy is added to the grid), the rotating disk of the installed electric energy meter shall not rotate more than 1 turn. When there is no back pressure in the positive line and the output current is released after the metering stops, the indication of the operating electric energy meter changes to more than 13 division values within 1 minute, and the indicated pulse number (or the setting difference) of the changer should be correct,
the working system additional pressure|| tt||At room temperature [157~250 million) and with air permeation, the relative humidity is 85% (for Group A and Group B electric energy meters) or 95% (for Group A and Group B electric energy meters below, the electric energy meter should be tested for 50H to 60H with actual AC frequency (with installed value) for 1mi,
5.1 The test voltage between all lines to the casing or external circuit is 2sV (after service life: 1.5kV, the working voltage is not higher than 40V; the test voltage between the auxiliary lines to the casing is 500V: 5.2 Current reduction circuits and wires, the test voltage between current lines of the same phase is 0V. 6 AnDian () 2819613365, 137917892413 The electric energy meter produced by cattle and the inductive system electric energy meter constructed according to the quality period: 1, all have become the technical requirements of the stability (0, 25-level human-powered electric energy meter 1.2-level meter calibration
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Verification documents
Service type inquiry quantity and its allowable deviation, should not exceed 7 provisions 7
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society, standard surface degree standard in 4 application fee knot card, related mark 20C, Jun Huan Qing match Long Zu through the specified position, in 1A to 30 billion me range, allow library E towel can ask for the knowledge of the quality of the ear protection relative measurement on the standard work no degree of positive determination of music, 7.2 The meter is a digital wheel type electric energy meter. Only when the meter is not in motion, the alarm and demand of the unit can be detected, the external magnetic field (except for ground induction) and the influence of iron objects and adjacent meters shall not exceed the provisions of Table 8. The electric energy meter shall be subject to the influence of external magnetic field and soft sound quality and adjacent attenuation level (avoid ground grid) and the manufacturing quality of the meter shall not be affected by the change of the meter (). Note: According to the following method, the meter can also be affected by external magnetic field and soft sound quality and adjacent attenuation. The power meter is set at the standard of 1C. When = 1U inch, the relative reading difference between the measured voltage and the line end should be measured. The relative guarantee is widened. When 20% of the reading is set and = 0.51, the three-phase meter is tested within the month #. The original 1G standard is guaranteed. When 0-1.0 is collected, the annual number of coupons and tons will be changed by 20, but the phase library is changed. The part is obtained by swapping the charger with the relative average value of the product, and the relative stability of the two-phase meter is obtained. The two-phase voltage and current phase sequence should meet the requirements of the wiring diagram. The three-phase voltage and current system should be symmetrical, and its symmetry conditions should not exceed the meter. 379
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The lower phase (line) electricity is used for the two (line) positive level gate calculation%
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3 phase (line: voltage including electricity on the phase benefit:.
,%-[2-,-[,-%a,一0.一,s0, a-2 (effect 3], The non-electric leading current is changed to the sub-value before the current is turned on, and the voltage is set after the voltage is output. Under the conditions of ainp=1.0 (for active energy) or ainp=1.5 [for active power attenuation], the voltage line is added with the rated voltage [b, the current line is calibrated for 30min (for 0.1-1 micro-electric energy) to 15min: (for 2~3 level energy meters, start to measure the basic error and self-heating error test data in the order of decreasing load current. The power-on preheating error of the basic type of electric meter can be appropriately increased or decreased (the error when the meter is turned on and reaches thermal equilibrium, and the difference between the error when the thermal equilibrium is not reached does not exceed 15 basic test limits) Principle, determine the power-on preheating time) standard table according to its technical requirements to determine the power-on preheating time. 8
Calibration device
8, 1 The standard deviation used when calibrating the electric energy meter using the "Watt Silicone" or "Standard Electric Energy Meter Method" is to determine the estimated value of the standard deviation of the electric energy measurement error and the evaluation of the measurement accuracy (total accuracy) through an average test. The value shall not exceed that in Table 10 and Table 10! (For the standard instrument used in the calibration device, see Appendix 1). When the calibration device is used, if its measurement error exceeds the specified value of the table, but does not exceed the specified value by more than two times, consider using a standard instrument or the calibration meter to correct the error. 1 The measurement error allowed by the calibration device| |tt||Controlled electric meter standard chicken equal amount
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8.2 The error of standard meters and standard transformers shall not change during the calibration period, and the calibration equipment shall meet the requirements of Table 10 and Table 10.
8, 3-point viewing instruments shall have sufficient measurement range, and their accuracy level shall not be lower than that specified in Table 12. The normal indication range of the product shall meet the requirements of Table 12 and Table 9. The measurement of normal current meters and product meters, including voltage, test transformer error or analyzer error
micro-test meter
2, 3 (no error)
according to the provisions of Table 12
the meter of the project indication range shall be within the relative standard. If the voltage is monitored by the supervisor, the difference between the two-phase voltage and the voltage meter at the same position shall be measured, and the multi-source index shall not be twisted through the receiving meter. For the purpose of comprehensive and comprehensive knowledge, the 8.4 voltage and current regulator can be adjusted to the required indication value of the monitoring rate (using the standard energy meter method) and the standard power meter (applicable to the watt-second method). Within the rated load range, the change of any two-phase voltage or current should not exceed +3% (when the output current of the empty device is greater than 3, it is allowed to be 5%), and when the voltage (current) is changed, the set voltage (or current) should not change significantly. Table 13 Load power conversion constant setting standard adjustment level T Yongwei electric energy meter station T rate) test period Not applicable: standard electric energy meter (long-term standard electric energy meter) quality also has a higher rate requirement than the central rate of the foreign Kang Fang Yuan element see the record 4. According to the relevant requirements in Tables 7 to 9, the power factor of the adjustment factor is shifted to the required value of the power meter or the research meter. When adjusting, the output voltage (or battery) of the adjustment shall not exceed 15%.
9. When the device is under rated load and light load, in the same phase power circuit, the sum of the potential difference V between the two opposite voltage terminals of the standard meter and the test meter is
percentage of the rated value of the micro-control meter, and the accuracy of the meter setting shall not exceed the
provisions.
Three calibrations
Installed watt-hour meter
Under-frequency endurance test:
Direct inspection;
Motion test:
Load dynamic rate stability should not exceed the value in Table 13
Other technical standards of calibration device: 9.4 Starting test:
9.5 Calibration constant:
Determination of basic error
Portable watt-hour meter
Under-frequency endurance test;
Observation inspection;
Submersion test:
Motion test;
Basic error
When the portable watt-hour meter is calibrated weekly, the under-voltage test and internal inspection are not carried out. IV. Verification method
11 Power frequency withstand voltage test
Newly produced and processed, the product shall be subjected to the power withstand voltage test 11.1 The test shall also be carried out in accordance with the provisions of Article 5 of the product, 11.2 The power withstand voltage test is to be installed with a high capacity of not less than 500VA, and the test voltage can be steadily increased from the set value every day. The test voltage shall be the actual voltage of the device (the ratio of the peak value to the effective value is 1.34~1.48). Ⅱ.3 Test the voltage between all the current circuits, the auxiliary button and the grounding screw of the shell (or the relative plate of the base of the meter), and fix the wiring in the box to the position of the largest diameter wire, and twist the box. When conducting rated voltage test on different circuits, the test voltage is between all the circuits connected to the same voltage and between the circuits with different currents (intentionally, disconnect the terminals between the high-voltage circuit and the circuit without the test and make a connection with the circuit board). 1.4 The test voltage should increase from the specified value within 5-10s and maintain for 1min. The insulation should not be broken down. The test voltage is reduced to the specified value at the same speed. During the withstand voltage test, if there is any corona or sound, it can be considered that the insulation has been broken down.5. During the periodic calibration of the belt-type energy meter, the insulation resistance between each circuit, the circuit and the external metal parts and different circuits (except for auxiliary circuits) can be determined by 50UV. Under the conditions of belt temperature and air relative concentration not exceeding 85%, the insulation resistance of the insulation resistance should not be less than 2.5Mn. 12. Inspection in progress
12.1 Installation and inspection of energy meters
Each energy meter should be inspected externally, and a certain number of energy meters can be randomly selected (5% of the total number of energy meters submitted for inspection) for internal inspection. 12.1.1 External inspection: The following defects should be inspected: the nameplate is obviously skewed, the markings are not complete, the characters are not clear: the numbers on the wheel meter are 1/5 of the height, the window cover (the wheel is in the half position and the wheel is in the full position) is broken, the case ring is not intact, and the color is not complete. The mold is not full, it can be determined to be small or broken: the box is not firm or damaged, the box is not twisted, the screws and terminals that fix the meter are not intact or missing, there is no pin, the connection part of the case is spherical or rusted, the fixing of the electric energy meter is damaged, there is no mark indicating the rotation of the turntable. When the electric energy meter is added with the rated center 10 as the calibration book flow, the power room efficiency is 1. The turntable does not rotate or there is obvious movement (see Appendix 2 for the calibration wiring diagram of the electric energy meter; there is a color code or color code position for reading the number of revolutions (when the anti-submarine needle is closest, the color code should be in front! Or the length (it should be 4%-6% of the circumference of the turntable) is small and appropriate 12, 1.2 During the internal inspection, the following defects should be inspected. If there are still defects, the full-scale electric meter submitted for inspection will not be calibrated:
The fastening wires of various parts are loose Or the necessary rings are missing: there are powder or debris on the turntable and brake contacts; the guide is not fixed or welded, and the edge of the guide is aging: daily inspection, full load, light load and phase angle adjustment, and the balance gear device is in the limit position, with adjustment weight: the magnetic end faces of each brake magnet are not straight and the rotating plane is not straight, and there is a significant difference in the distance from the center of the turntable; the turntable end is not between the brake magnet and the actuator; the seal is poor, and the wheel and the worm are not engaged at 12-1/3 of the gear ratio: 12.2 The portable electric meter
was found to have the following defects:
There are defects related to 12.1.1:
The meter is not flexible, and the distance from the starting point scale line after returning to zero exceeds 13 of the scale value, and the indicator is dead to the surface of the inspection disk Abnormal, the displayed pulse number or the relative error of ten degrees cannot be calculated and needs to be checked; the spirit level on the meter is damaged, the horizontal wire of the continental section and the burning wire of the external voltage and current line are damaged or missing; the quantity chain is replaced and closed, and the necessary maintenance circuit breaker and other reverse-connected components are damaged. 13 creep test
After repair, the energy meter can add 110% rated voltage, new and heavy cable voltage, the current line of the high-voltage meter can also add % rated voltage (through a universal transformer to form a good energy meter, during periodic calibration, the current circuit can be connected to an inappropriate load current, or the user needs, under the condition of a fixed power of [.0, 1/5 of the starting current is allowed, the test scale can increase the judgment value by {T5%), the rotation of the turntable shall not exceed the limit, and the added energy meter: check for creep according to Article 4. During the power test, other test conditions shall meet the relevant provisions of Article 14. When the electric energy meter is under the condition of fixed frequency, rated voltage and power factor of 1.0, after the load current rises to the specified value in Table 6, the relay shall be rotated and rotated within the time limit. Time limit connection formula (1): 0=1.4×00x1000
Formula r—Energy constant [r/kw-](kvnrh]]P—Starting power (W):
For single-phase electric energy meter, F=fQ: For four-wire energy meter, P=3: For three-phase three-phase electric energy meter, 302
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