JJG 2082-1990 Verification System for Power Frequency Current Proportional Measuring Instruments JJG2082-1990 Standard Download Decompression Password: www.bzxz.net
The verification system for power frequency current proportional measuring instruments is applicable to the verification procedures for current proportional measuring instruments for new manufacturing, in use and after repair, with a rated frequency of 50Hz and a power waveform distortion coefficient not exceeding 5%. The verification system for power frequency current proportional measuring instruments specifies the transfer procedures for power frequency current proportional values ​​from the benchmark to various levels of standards and even to working measuring instruments, and its contents include: benchmark, standard, accuracy of working measuring instruments, measurement range and basic verification methods, etc.

Verification Scheme of Meakuriug Istrmments fnrPnwer Frequency Cnrent KatdoJJG 2082—1990
Verification Scheme of Meakuriug Istrmments fnrPnwer Frequency Cnrent KatdoJJC2082—1990
This national metrology verification system was approved by the State Technical Supervision Bureau on November 10, 1900, and took effect on May 2, 1919.
Drafting unit: National Electricity Metering and Installation Station
The technical provisions of this verification system shall be interpreted from the blue list, and the cloud verification system shall be mainly drafted by:
Chen De'ai
Weijia Shangtunle Metering Station)
Participating drafters:
Yingshi Lian
Zhang Nianping
(Shanxi Transformer Research Institute
(North China Electric Power Testing Institute)
( Home and Commercial Electric Metering Station)
(National High Voltage Metering Station)
Metering Base Instruments
Metering Standard Instruments
Working Metering Base Instruments..
Topic Current Proportional Metering Instrument Calibration System Cabinet Catalog
Power Frequency Current Proportional Meter Calibration System High Frequency Current Proportional Meter Calibration System Applicable" Rated Frequency Square 0H. Source Wave Flying Coefficient Not More Than 5% of the New Inverse, Use the Plate The calibration procedure of the power frequency current ratio meter is stipulated in the calibration system. The calibration procedure of the power frequency current ratio meter stipulates the calibration procedure of the current ratio value from the reference to the standard until the second measurement instrument. Its contents include: accuracy, standard, accuracy of the meter, measurement range and basic calibration methods, etc.
A measurement reference instrument
1 The power frequency current ratio national standard is used to display and preserve the most accurate power frequency current ratio value, which is transferred to the working meter through the standard instrument to ensure the accuracy and uniformity of the power frequency current ratio value. 21 The ratio value reproduced by the national standard of thermal current ratio is used as the basis for the measurement of power frequency current (5A·-60A)/5A.
! The power frequency current ratio national standard device is generated by the standard, the difference meter and its auxiliary equipment. 3.1 The reference body is composed of seven compensated power frequency current comparison instruments. The measuring ranges are as follows: No. 1 comparator range: (530A)75.A No. 2 comparator range: (5-10A)/5A No. 3 ratiometer range: (5-1004)/5A No. 4 ratiometer range: (5-200A)/54 No. 5 ratiometer range: (5A--2kA)/5A No. 6 comparator range: (1.5-.1UL4)/5A No. 7 ratiometer range: (5A--2kA)/5A 10~60k15
3.2 The difference measuring instruments and transmission equipment are as follows: 3.2.1 The current ratio error meter has an accuracy of 2%; 3.2.2 The auxiliary current generator has a range of (0.1A-1A! 5A, accuracy of 1%, and requires adjustment:
3.2.3 The accuracy of the current load box is 13%-0.05VA3.2.4 The current sensitivity of the electronic finger is 5× -1A/grid: 3.2.5 0-60kA power frequency test state commercial standard power supply device and type regulation equipment; 3.2.6 Symmetrical grounding branch and its regulation equipment, etc. 4 The uncertainty of the national standard of the low-frequency current ratio (2) is: [No. current comparator 0.2×1U-6
No. current comparator 2≤0.2×106
0.3×10-6
No. current comparator||tt ||20.4×10-6
2 Bow current comparator
5 Current comparator
551x106
6 Current comparator
7 Current comparator
3:1x10-t
Some factors that are not acceptable are:
Need to match the signal (the number of measurements is generally less than 15 times; t:K
Error limit;
. Estimated value of actual standard deviation,
According to the actual situation of the current ratio pad, select e= 34
5 Two-frequency current ratio national standard ratio cloud body, differential instrument and auxiliary equipment, etc. 5. The industrial current ratio industrial standard mountain four power frequency current comparison groups should be set, and the comparison range is as follows: No. 1 current comparator (0.1.-100A) 1A, 5A No. 2 current comparator (5A--2KA] 5A
No. 3 current comparator (1MIA--5KA) No. 4 current comparator (100A~SkA) A
5.2 Xie whole device or Auxiliary equipment is divided into: 5.2.1 Current proportional loss meter accuracy is -2% 5.2.2 Adjustable current sensor residual range is: (0.1-50A) A, 5A, (5-2mA!/A, (SA-1kA)/5A, the accuracy is ±.01%; 5.2.3 Current load box accuracy = 3% ± 0.05VA: 5.2.4 Electronic zero current sensitivity rate 5×109A/grid: 5.2.5 Can produce D-10k4 work 5.2.6 Design of grounding branch and its adjustment device, etc. 5.3 Power frequency current ratio working standard with uncertainty 32×10~5
confidence factor selection interval 4.
Power frequency current ratio working standard ratio values ​​can be verified by basic self-calibration system, and can be transferred by white calibration, addition, comparison, division, etc., or can be verified by calibrator. II. Measurement standard instruments
6 Measurement standard instruments The instrument is composed of a graded electrochromic comparator and a commercial grade measuring instrument, a current proportional error meter (including a seven-pointer) and auxiliary adjustment equipment. 6.1 The measurement range of the measuring instrument: The primary current is 0.1A-50kA. The secondary current is equal to and equal to. 6.2 The allowable error (uncertainty) of the basic standard instrument is as follows: Grade 0 (2) × 1-6 or 210-
0.0005 Grade 5 ≥- (±5=15) × 10 or 5×10-0.0.0005 Grade 1 = (+1-j1) × 10-1×10 5
02 Grade 2 = (12-2) × 105 or 2x
0.005 2
(±5=j5) × l As×1n-s
2 meets the 0.01 level error requirement in Table 1
meets the 0.02 level error requirement in Table 1
meets the 0.05 level error requirement in the table
meets the 0.1 level error requirement in Table 1
[Continuous] In the formula, the real number part is the fire ratio, and the effective part is the phase difference. The above error is not caused by the current ratio meter of the county level. The most standard is the current ratio of each level of efficiency. When the ten-level standard device is used as the calibration system, it is necessary to indicate its uncertainty. It is recommended that the confidence factor be taken as appropriate (the number of measurements is not less than 5 times), and the proportional value must be measured to the same reference source. 6.4 Measuring instruments shall not use reference or working reference for measuring values, nor shall they use multiplication or division to communicate the required large or small current values: but the standard shall have a higher accuracy than the one being measured. When the standard current sensor does not have a higher accuracy than the one being measured, a standard instrument with a total accuracy one level higher than that of the one being measured may be used, but the error of the one being measured shall be added to the error of the standard instrument for correction. Working measuring instruments: 1A measuring instruments: Working measuring instruments include current transformers of grade 0.1 to 7.1 and their corresponding proportional instruments (excluding shunts), but the auxiliary instruments shall include special current transformers with a very high accuracy level, ranging from 0.(M)2 to 1.5. 7.2 The measuring range of the measuring instrument is: one ohm current range is 0.1A.-604, one ohm current range is 54 and 1A, etc. The allowable error of the 3-level measuring instrument is shown in Table 1, and the allowable error of the other two levels is as follows: 4=（±2±2）×-5
4=(±5±5)×10
Table 1 Electricity mutual must be strong and the error of the parts
accuracy
ratio (=%)
generally the rated current is
phase difference (± points)
rated current percentage
Note: 1 in the rated value, the lock military medical and secondary goods back for the female 100% to 25% (the second current ratio is 5 electric communication mutual shadow promise, the following shall not be less than 2.5VA any number, the actual recognition of the plastic shall not exceed & [listed wet section of the new unified standard diagram,? Table [said in the standard specification: the standard specification of the government error book all from the national situation of this supervision sales approved by the mouth, the technical design of the electric rolling thought of the device,
.The working metering instrument’s table error is verified by comparison with the corresponding standard instrument. The metering mark should be higher than the working meter by two accuracy levels, that is, the accuracy ratio of the standard and the object to be checked is 1:5, and the smaller one is greater than 1.4. The old rated current proportional metering instrument verification system block diagram. The symbols in the block diagram are as follows:
rated current proportional metering instrument verification system controls
ampere,
one thousand amperes, bzxz.net
one allowable error,
one uncertainty each
-8SA1A
long legal business
authoritative measurement
current plastic surgery
: - ratio (K3)
the real number part is the ratio difference, and the phase difference is the phase difference.
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