Verification Regulation of Verification Equipment for AC Electrical Energy Meter
Some standard content:
Verification Regulation of Verification for AC Energy Meter.JTG 597—1989 597--1089
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This standard is approved by the State Technical Supervision Commission on April 6, 1389, and is effective from February 6, 1990. The responsible unit is: Jiangning Hall Measurement and Supervision
Drafting unit: Jiangning Metrology and Testing Technology Research Institute, Linan Metrology and Testing Research Institute
The technical text of the standard is interpreted by the unit in charge. The drafters of the key notes of this standard are:
Gao Huaqi (Ningbo Metrology and Testing Technology Research Institute) Peng Ping (Henan Metrology and Testing Research Institute) 6.32
Technical requirements·
Verification conditions
Item determination…
Network verification method| |tt||V. Processing and verification results: For the purpose of
Table 1+Verification Certificate”, “Verification Result Notice” section format and verification results are as follows: 2. Example of measurement error determination of the device… 3. Method for comprehensive error determination of the device
1. As a standard, the device measurement error situation shall be determined after the device is sent for inspection. Appendix 4
Verification procedures for AC electric energy meters
This procedure is mostly based on 1:736-1932 "Test Report for AC Electric Energy Meters". This regulation is for the verification of new production or AC electric energy meters (referred to as AC electric energy meters) after verification,
Technical requirements ||t t||1 Marking
The markings on the device shall be selected in accordance with national standards or the period specified by the US technical department. 2 Structure
2.1 The device shall be equipped with a grounding terminal and marked with a grounding symbol. 2.2 The switches, signals and switches on the device shall have a direction mark. 2.3 The inspection points shall be as follows: the workbench and the support shall be in the working position (see Table 1): the lead wire to be inspected shall be dedicated: Table 1
The allowable deviation of each working position from the working position
1 Position
To the position
2.4 When installing, the circuit of the electric music should be divided into ten parts, and the frequency of the electric music should be the same: the layout should be neat, the warehouse connection should be reliable, 3. Installation error 3.1 The error of the installation refers to the error of the device under special working conditions, and it is determined by mountain tests. 3.2 The measurement reading error of each level of meter should not exceed the specified value in Table 2. The allowable reading error expressed in percentage in Table 2 is used according to the specific level of the meter. The small two-level method is used when the meter is installed. 5 (scientific) : .9 (scientific 4) 0.5 (capacity) = 1.5 (capacity) (hazardous) ±# 25
Note: The power factor is the space between the components in the industrial standard - year market, 6.34
Get the new production of the common certification
convenient device
Table 3 The estimated detection error of the device light varies with S () Assume
wmm-C.51.2m)
sip-I n
mg-0.4 (inductive)
9 -12. (inductive)
>19. = 1-0
sir.g-0.5 (sexuality)
The allowable standard deviation is not yet "
3.3 If the reading error of the meter used in the measurement exceeds the limit specified in Table 2, but is not adjusted by twice the specified value, the device (station working standard meter) must be used to correct the error. The standard deviation estimate value
has the required limit. When the measured value is repeated less than 5 times, the standard deviation estimate of the measurement station shall not exceed the value specified in Table 3.
5.1 The accuracy level of the standard meter used in the device shall not exceed the limit specified in Table 4. The working standard attenuation accuracy of the device is desired to be set with the accuracy of the pilot frequency
standard cell meter scientific confirmation level
standard power reduction research voltage level
Note: the real-time installation quality can be determined by the standard measurement table 4, and the relevant information is determined by the test and the support. S.1.1 standard power meter makes the relative difference of the H measurement point (expressed as a percentage) should not be required by the person who makes the table work well, etc. 5.1.2 three-phase installation in the month (two) single analysis model standard power Energy meters (or power meters) shall be of different types and limits. 3.2 The standard voltage used in the distribution transformer and the accuracy grade of the current transformer shall comply with the provisions of Table 5. The standard voltage and current transformer accuracy grades used in the attenuation terminal shall comply with the provisions of Table 5. 5.2.1 It is allowed to use a transformer with a grade lower than that in Table 5. During the device verification period, it shall be able to meet the requirements of Tables 2 and 3. This principle also applies to the case of installing or only using current transformers. 5.2.2 The voltage and current quality of the standard mutual or instrument shall be consistent with the inspection code, and the current specifications shall be consistent. The working current of the standard energy meter shall not be less than 1/2 of the rated current. 5.2.3 During periodic calibration, the standard current transformer installed in the pipe can be exempted from calibration; the repaired or newly installed ones shall be within the validity period. S.3 When using the month-to-second method, the standard battery time shall not be lower than the rating in Table 6. r5
Standard is based on the allowable time difference of the electric energy meter when measuring.
Maintenance.1 During each measurement of the electric energy meter, the output power stability should not exceed the requirements of the table. The standard allows the output power to be free from the negative power requirement ().
2 When the output power is reduced, there is no special requirement. When the device is under increased output load, the output response shall meet the reference conditions of Table 8 and Table 5. 6.2
Table 3 The value of the influence and the allowable deviation
Accurate store line
Each fixed rate
moy p)
Maximum deviation
British type ten
Table 9 Three-phase weight reduction output Three-phase power giant, power system symmetry case special setting rare world etc.
Each machine (line) voltage ± for three machines (standard) monthly voltage ten average not less than (%) phase voltage of the scientific difference not less than ()
One cabinet power and the corresponding lower torque and the tooth current and the potential difference are not equal
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When the current is positive,
6.3 The input circuit and output voltage circuit and current path of the three-phase device are connected in the positive phase. The positive and negative phase sequence switching switches and monitoring meters or indicators should be set in the old money circuit. 7.1 Voltage reducer and current regulator
7.1.1 The use range should be consistent with the equipment's 1. The quality limit should be: under any output product limit, the regulator can smoothly and continuously adjust from zero to 11% of the rated voltage. 7.1.2 The adjustment fineness (expressed as the difference between the adjustment discontinuous disk and the upper limit of each quantity) should not be greater than 1 of the standard meter level value in the meter.
7.1.3 The adjustment equipment required for three-phase installation should be able to adjust the output voltage and current separately (allowable: phase adjustment book, low must be minute adjustment disk). When the voltage drops to the rated load, the adjustment book will be any phase current (voltage! When: the other village electro-hydraulic voltage) changes Change is not more than ±3%: when the meter is set to output current greater than 20A, the allowable change is ±3%, the commercial voltage (voltage) is positive, and the adjusted current (or voltage) does not change significantly. To change the phase shift of the self-flow or user phase, it should be able to ensure that the required phase is adjusted to the entire load. 7.2.1
If the step-by-step phase shift method is used, a regulator must be installed. The regulation of the regulator should be connected to the stepping disk, and the step-by-step phase shift should be switched.
.2.2 The fineness of phase shift adjustment should not be greater than 1.7.2.3 When the phase shift adjustment angle is adjusted to the rated load range, the change of output voltage (or current) should not exceed 11.5%.
.3 The three-phase device should have three-phase voltage and current symmetry regulators and symmetric indicating instruments to ensure that the output voltage and current are basically symmetrical. During each measurement of the specific energy meter error, its symmetry conditions always meet the meter requirements.
7.4 The device is equipped with automatic current adjustment, power spectrum test, and unbalanced load test functions for three-phase electric energy meters.
The starting current values allowed by the various levels of the test set should not differ by more than 5%. 8 Monitoring and evaluation
1 The monitoring meter should have sufficient measurement range, and its accuracy level should not exceed the requirements of Table 1. Electric meter: Ammeter, power meter measurement error includes voltage, current regulator: rectifier, shunt, etc. The relative error of the common indication of the receiving meter should meet the requirements of Table R and Table 9. 10. The monitoring device of the receiving system should be assembled and managed accurately. Please install the meter of the corresponding level.
phase meter
heat car agricultural
1. Use this special meter to measure the accumulated current, avoid some to m fire control 1
2. In the swing more quantity low rate number allows the calculation of the core to use the corresponding voltage return system price and the indicator of the state of the skin electric music. Only the installed heart can be reported.
5. The electric disk is like a certain electric, relatively long., .3 level meter with intrinsic safety rate meter, 8.2 A pole voltmeter should be able to measure the voltage and verify the cable is suitable. Use three electric meters to measure the symmetry of the three-phase voltage. The minimum error between each meter should be adjusted not to be greater than the level of the meter, otherwise it should be equipped with an electric music level indication group. 9. The potential between the terminals of the standard meter and the meter under test shall be connected on the circuit. 9.1 For the inductive device, the percentage of the sum of the potential between the two pairs of voltage terminals of the standard meter and the general meter and the rated voltage of the meter under test shall not exceed 1% of the device's accurate level. 9.2 The voltage transformer shall be connected to the device and the percentage of the potential difference between the two pairs of terminals of the same phase and the rated voltage of the meter under test shall not exceed 1% of the device's accurate level.
When the device outputs at full capacity for a long time, the safety efficiency of the inductive device and the standard meter shall be less than the following value: 1: 50A
Where: ! The device box uses the electrical system:
indicates the inductive skin strength in the air.
Device insulation
B 0.C5rsT
1.1 The insulation between the electrical part of the equipment and the non-energized external metal parts, as well as the insulation between the power supply circuit and the current loop, should be able to withstand a 50Hz (60Hz), positive wave 2kV compensation voltage for 10,000 hours at room temperature and humidity not exceeding 85%. The auxiliary voltage test voltage of the nominal circuit is 300V when the positive voltage is lower than 50V. 11.2 The insulation value of the circuit to the ground and between the circuits is not less than 5M2: The megohmmeter used when measuring the panel is the rated voltage of the equipment. New monitoring equipment and auxiliary equipment must have sufficient baking time, and the influence of these equipment on the error of the meter can be ignored. The manufacturer shall specify the time required for the meter to reach stable error. II. Verification conditions
13 Technical documents
13.1 The device shall be correct, the original drawings shall be read, and the installation instructions shall be read. 13.2 The internal standard electric energy meter (or standard power meter) and the standard monitoring instruments shall all have valid verification certificates.
13.3 The internal standard voltage and current transformers shall be verified during the first verification of the device. And the calibration certificate is valid until the end of the validity period. 14. When determining the difference between the measurement and the installation, the following items shall be met: 14.1 The room where the instrument is placed shall be free of volatile gases, sunlight and sufficient illumination. 142 The room shall be kept at a constant temperature. The constant temperature of the second-level device is: temperature - (20-2)
relative humidity 85%
14.3 The power supply and vacuum of the device and related auxiliary equipment shall meet the requirements of manufacture and modification: 14.4 The output of each level of the device shall meet the requirements of Article 6, and the various measuring instruments in the device (such as ground current) shall be used. 14.5 According to the provisions of Article 10, the device should be preheated and then measured in parallel after reaching the thermal stability state: the preheating time shall be as specified by the manufacturer: 15.1 The measurement error of the device test standard shall exceed the specified value in Table 11. 638
0.1)
Test standard allowable measurement error (%)
Fast delivery method Yayue Xue level
. 0.4f
Test tolerance
15.2 All other calibration items shall be subject to the control certificate within the validity period. 6 The device shall be adjusted immediately before the calibration. Verification items
17 General inspection:
1,2 Absolute or absolute test:
17.3 Determine the phase sequence;
17.4 Determine the output power calibration degree, remove the voltage and the voltage distortion degree;17.5 Check the voltage adjustment and current regulator;17.6 Check the phase shift;
17.7 The inspector shall monitor the measurement accuracy of the meter:1.8 Check the half-phase balance adjustment device, and determine the phase voltage:17.9 Determine the voltage loop connection position difference between the standard meter and the meter under test:17.10
Measure the magnetic induction intensity of the standard meter and the meter under test:Measurement and difference of the device:
Measure the standard deviation of the device.|| tt||18 Periodic threshold items monthly general inspection;
Determine insulation resistance:
Determine the stability of the object:
Determine the voltage waveform; 18.3
18.4 Check the range and accuracy of the monitor attenuation measurement:.5 Determine the voltage circuit according to the standard recording and the measured value of the meter: the standard deviation of the measuring device is still the meter value. Calibration items under the connection
19.1 Weekly calibration of all items to be inspected: 19.2 According to the location and related information, add corresponding risk measurement, four methods of determination
20 General inspection
2 shifts.! Check whether the technical documents and the control certificates of the meter base equipment are complete, and check the corresponding physical objects 20.2 Technical requirements, especially the second policy, use the method of daily measurement and induction to check the mark: use the water meter, weight square and other tools to measure the maintenance range of the hanging rack, the full table [must be handed in, 20.3 If any of the following conditions are not met, the calibration is not carried out: 20.3.1 Lack of installation instructions and standard meters, monitoring meters and other valid certificates; 20.3.2 During the first calibration, the standard voltage and current transformer calibration certificate is missing; 20.3.3 The markings on the equipment are incomplete or unclear; 20.3.4: The operation of the switch, the wheel, the tree, etc. is not flexible, loose, poor contact, damaged and cannot be used; 20.3.5 The current code rent voltage circuit is not separated or the power supply is different 20. 3.6 The workbench and the meter stand shall not be in the correct working position: 20.3.7 There are other defects that seriously affect the performance of the meter. 21 Insulation strength test
21.1 According to the test position specified in Article 12, use a megohmmeter with a rated voltage of 100V to measure the insulation resistance. The resistance value should not be less than 5M2. The auxiliary load circuit is 50V lower than the working voltage. Use a megohmmeter with a rated voltage of 500V. 21.2 If the meter is qualified, perform the positive test according to Article 12. Use a dielectric breakdown device with a capacity of not less than 5VA and a 50V/2kV. When performing the positive withstand test, disconnect the equipment that is not suitable for the test, ground the untested circuit, and connect the test circuit between the test circuit and the test casing or between the test circuits. Keep the test voltage constant until there is no breakdown phenomenon. After the test voltage is removed, the insulation resistance is measured again, and its resistance value is the value specified in Article 21.1 of the standard. 22 Phase sequence determination of phase devices
22.1 The voltage and output voltage and current sequence of the two-phase device input power supply are measured with a phase sequence meter, or other methods can be used.
22.2 Determine whether the position markings of the phase sequence indicator and the sequence switch are correct by measuring the phase number. 23 Determine the total stability of the phase ratio
23.1 The power expression with sufficient stability and resolution should be used for measurement. When measuring, select the power expression commonly used in the device. The limit of measurement is 1:, the auxiliary rate number is 1.0, the heart rate is 5.5 (inductive) is the maximum load and the minimum load or the condition is measured respectively: the measurement time is 10 (can be extended according to the need): take a number every 5%, 23.2 The output load rate stability of the device is calculated according to the formula (1):) =
(P-Ps)±2.85J
Where: P.—the calculated value when c is equal to the given value, P——the first measured rate reading (i=1, 2.3n)P——: the average value of the readings of the power rate in each period;
calculated power at the time of 1\:
n-number of measurements, 20. The absolute value of the calculated result is taken as the basis for judging the power rate stability. The maximum error is calculated by calculating the phase error:
8-IP, P>2.85/
F-, then the phase error component is included in
23.3: The phase device should measure the output power of each phase separately and simultaneously. The three-phase and split-phase determination results should be as required. 24. Determine the circuit: the voltage waveform changes, 24.1 Observe the commonly used working limits and the minimum load, and select the line under large load: 24.2 The test is generally carried out using the loss of accuracy test circuit as shown in Figure 1 and Figure 2, and the voltage is accurately determined by the auxiliary output voltage form a large-scale true line ~ loss of accuracy is achieved with a large-scale test certificate Z-1 blood test
24.3 Each phase of the three-phase device is tested.
25 Check the power transmission, current control device
Figure 3 Check the current distortion test circuit (for position):
Effect: First test
25.1 Check the voltage of each section, the current back hook is stable and adjusted to the maximum value, 25.2 The step adjustment device should check the adjacent adjustment disk adjustment range box according to the working condition. The inspection can be carried out by the following method: Cut off the voltage (current) fine regulator to its upper limit of the adjustment range, record the output voltage (current) value at this time (1): Adjust the fine regulator to the lower limit of the adjustment range, and record the voltage (current) value V at this time. (12): Finally, adjust the coarse adjustment dial to the upper limit to the "step value", and record the output voltage (current) V at this time. (,), which should satisfy the following relationship:
Vh> V()> Vt)
This test should be carried out within the range of the minimum value, the maximum value, and the voltage (or current) regulator from the floating value to the rated value. 25.3 Determination of voltage and current adjustment fineness
The determination of the adjustment fineness should be carried out under the condition of maximum or minimum load, near the rated value of the regulator output voltage (current).
An external high-sensitivity digital voltage (current) meter is used to adjust the fineness of the regulator, and the maximum variable (actual value) of the regulated quantity (voltage station current sink) is read. The adjustment fineness is: () =
（%）
If the regulator can continuously and evenly adjust to the values of the monitoring voltage meter, temperature meter, average rate or standard power meter (applicable to the ratio method), the adjustment precision is considered qualified. 25.4 Determine the mutual influence of the three-phase voltage and current regulation system. 25.4.1 When the device is under rated load and the power is 1.4, 25.4.2 Adjust one voltage (current) to the rated value, and then adjust any phase current (current) value to zero, and use the internal voltage (current) meter to measure the product value (value) of the remaining phases. The percentage of mutual influence is: industry × 100
: %）|| tt||25.5 Check the starting current test function
25.5.1 Under the conditions of rated voltage, rated frequency and power factor of 1.0, carry out the test. 25.5.2 At the current output of the device, connect an external milliammeter and a measuring device to measure the current difference. 25.6 Check the current switching switch of each phase with no load. 26 Check the phase shifter.
26.1 Under the maximum or minimum load, use an external phase meter to check the phase shift range of the phase shifter: whether the leading and lagging phases are correct. 26.2 The phase of the step adjustment should be checked. The following methods can be used for inspection: connect the self-flowing, Voltage reaches rated value: put the regulating switch of the phase shifter group and show a certain value. When the power factor is indicated by the power meter, it is set to around 0.5), adjust the regulator to the proper position, and write down the indication of the phase meter: Finally, turn the regulating switch one gear in the decreasing direction and adjust the phase group to the upper limit value. At this time, the phase indication value is 2. If 92>1, the coverage range of the phase shifter is qualified. 26.3 Determine the rate of change of phase shift voltage (current). Install the load with rated load and add a constant current (current) at the input end of the phase shifter group (the current and voltage of the three-phase device should be symmetrical). Set it and make the output monitoring voltage (current) indicate at the rated value. Then, keep the input voltage (current) unchanged within the entire phase shift range. The voltage (current) of the reading box changes greatly, and the phase shift current (current) changes narrowly according to the formula:
Phase shift current (current) change rate_blue end output (by falling edge value × 10D (%) output current (rated value)
4 Determine the adjustment maintenance of the phase shifter
When measuring with the convenient or external high-sensitivity phase meter equipped with the device, turn the fine adjuster of the phase shifter to read the output position variable (when observing with a power meter, the power factor is 0.5). When it is difficult to read the variable, the shifter can be continuously adjusted to monitor the phase meter (or power meter) at any time. When it is considered that the adjustment fineness of the phase shifter is qualified.
27 Set the three-phase core voltage and current symmetry test 2. Set the negative contribution and connect them to form a four-phase system. Utilize the integrated control mechanism and monitoring instrument of the device to adjust the three-phase electric bed and current until the degree of the lamp is most correct, then use a three-foot center, 2-level or above standard voltage (current) meter, the output end of the device to measure and display the three-phase line voltage, voltage, and phase current, and calculate the mains voltage and current by formula (8) and "9), the two ideal voltage (or load voltage) level value × 1m (8) Electric symmetry (%:
phase voltage, (or load voltage) average value1. Under the maximum or minimum load, use an external phase meter to check the phase shift range of the phase shifter: the position of the phase shifter: whether the leading and lagging phases are correct. 26.2 The phase shift of the step adjustment should be checked. The following method can be used for inspection: turn the self-regulating switch to the rated value: when the power factor is indicated by the power meter, it is set to a certain value (around 0.5), adjust the phase shifter to the correct position, and write down the indication of the phase meter: finally, turn the self-regulating switch to the decreasing direction by one gear, and adjust the phase shifter to the upper limit value. At this time, the phase indication value is 2. If 92>1, the coverage range of the phase shifter is qualified. 26.3 Determine the rate of change of the phase shift voltage (current) when the load is rated, and the phase shifter is under rated load. The current and voltage of the input terminal of the device should be symmetrical: and adjust the output monitoring voltage (current) to indicate the rated value, then, keep the input voltage (current) unchanged, read the voltage (current) of the box within the entire phase shift range. The phase shift current (current) change rate is calculated according to the formula:
phase shift current (current) change rate_blue end output (by falling state sign value × 10D (%) output voltage (current) rated value
New 4 Determination of the adjustment of the phase shifter
When measuring with a convenient phase meter equipped with the device or an external high-efficiency phase meter, turn the fine adjustment of the phase shifter to read the output phase negative variable (when using a power meter for observation, the power factor is 0.5). When it is difficult to read the variable, the phase shifter can be continuously adjusted to monitor the phase meter (or power meter) at any time. When it is considered that the adjustment precision of the phase shifter is qualified.
27 One-phase three-phase voltage, electrical symmetry 2. Set the load to a fixed value and connect it to a four-phase system. Use the control mechanism and monitoring instrument of the device to adjust the current of the three-phase electric bed until the degree is the most correct, and then use a three-foot center, a standard voltage (current) meter of level 2 or above to measure and display the three-phase line voltage, voltage, and phase current at the output end of the device, and calculate the city voltage and current by formula (8) and "9), and the voltage (or current) of the two ideal voltages (or voltages) × 1m (8) Electric symmetry (%:
phase voltage, (or load voltage) average value1. Under the maximum or minimum load, use an external phase meter to check the phase shift range of the phase shifter: the position of the phase shifter: whether the leading and lagging phases are correct. 26.2 The phase shift of the step adjustment should be checked. The following method can be used for inspection: turn the self-regulating switch to the rated value: when the power factor is indicated by the power meter, it is set to a certain value (around 0.5), adjust the phase shifter to the correct position, and write down the indication of the phase meter: finally, turn the self-regulating switch to the decreasing direction by one gear, and adjust the phase shifter to the upper limit value. At this time, the phase indication value is 2. If 92>1, the coverage range of the phase shifter is qualified. 26.3 Determine the rate of change of the phase shift voltage (current) when the load is rated, and the phase shifter is under rated load. The current and voltage of the input terminal of the device should be symmetrical: and adjust the output monitoring voltage (current) to indicate the rated value, then, keep the input voltage (current) unchanged, read the voltage (current) of the box within the entire phase shift range. The phase shift current (current) change rate is calculated according to the formula:
phase shift current (current) change rate_blue end output (by falling state sign value × 10D (%) output voltage (current) rated value
New 4 Determination of the adjustment of the phase shifter
When measuring with a convenient phase meter equipped with the device or an external high-efficiency phase meter, turn the fine adjustment of the phase shifter to read the output phase negative variable (when using a power meter for observation, the power factor is 0.5). When it is difficult to read the variable, the phase shifter can be continuously adjusted to monitor the phase meter (or power meter) at any time. When it is considered that the adjustment precision of the phase shifter is qualified.
27 One-phase three-phase voltage, electrical symmetry 2. Set the load to a fixed value and connect it to a four-phase system. Use the control mechanism and monitoring instrument of the device to adjust the current of the three-phase electric bed until the degree is the most correct, and then use a three-foot center, a standard voltage (current) meter of level 2 or above to measure and display the three-phase line voltage, voltage, and phase current at the output end of the device, and calculate the city voltage and current by formula (8) and "9), and the voltage (or current) of the two ideal voltages (or voltages) × 1m (8) Electric symmetry (%:
phase voltage, (or load voltage) average value
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