This standard specifies the reliability requirements and assessment methods for electric energy meters. JB/T 50070-2002 Reliability requirements and assessment methods for electric energy meters JB/T50070-2002 Standard download decompression password: www.bzxz.net

ICS17.220.20
Machinery Industry Standard of the People's Republic of China
JB/T50070-2002
Replaces JB/T500701995
Reliability requirements and reliability compliance test for electrical energymeters
Published on 2002-12-27
Implemented on 2003-04-01
Published by the State Economic and Trade Commission of the People's Republic of ChinaForeword
Introduction,
Normative references
Terms and definitions,
4 Reliability requirements,
4.1 Characteristic quantities
Requirements.…
Assessment methods
Test plan|| tt||~General test procedure
Determination of test samples
Calculation of cumulative test time
Test working conditions
5.7 Performance test of test samples
Appendix A (Informative Appendix) Field sampling inspection method for service life A.1 Definition
Operation unit.
Sampling sample group,
A.2 Sample extraction
Test conditions
Test method.
Test Test result requirements.
Test result judgment principles
Appendix B (informative appendix) Guide to selection of reliability verification test, B.1
Truncation sequential test
B.2 Fixed-time constant-number truncation test
B.2.1 Advantages,
Appendix C (informative appendix) Example of reliability verification test for electric energy meter C.1 Example 1.
Determine the test type
Select the test plan
Select the sample size and Determine the test time for a single unit. times
JB/T50070—2002
JB/T50070—2002
Related failure times and related failure numbers,
Determine the test type
Select the test plan
Select the sample size and calculate the test time.
Test,
Determine the test type
Select the test plan
Select the sample size and calculate the test time. Test
Related failure time and related failure number,
Fixed use of indoor and outdoor instrument ambient temperature precise simulation change cycle diagram Fixed use of indoor and outdoor instrument ambient temperature coarse simulation change cycle diagram Test MTTF upper limit mo and test MTTF lower limit m1 Table 1
Truncation sequential test plan qualification judgment table.
Recommended sample size and timing constant truncation test Single unit equivalent test schedule 3
Test working conditions
Temperature and voltage cycle changes within cycles (5 years) Single unit application time 1
This standard replaces JB/T50070--1995 "Reliability Requirements and Assessment Methods for Electricity Meters". The main changes of this standard compared with JB/T500701995 are as follows: JB/T50070--2002
- The scope of application has been revised to: Applicable to AC electric energy meters with a reference frequency of 50Hz (extended to include static AC electric energy meters) (1 of the 1995 edition; 1 of this edition); The truncated sequential test plan has been added (5.2.2 of the 1995 edition; 5.2.2.1 of this edition): Regarding the fixed-time constant-number truncated test plan, the calculation method of the equivalent test time of a single unit has been revised (Table 1 of 5.2.3 of the 1995 edition: 5.5.2 of this edition);
The test working conditions have been modified (5.2.4 of the 1995 edition; 5.6 of this edition). In order to make the test working conditions consistent with the working environment of the electric energy meter, the temperature change cycle and voltage change cycle are specified, the grid frequency change of ±5% is deleted, and the instantaneous load pulse is added. Modified the basic error test points (5.3.4.1 of the 1995 edition; 5.7.4.1 of this edition): - Added failure classification, stipulating that the failure of the AC voltage test is a Class A failure (fatal failure). In any case, if such a failure occurs, the reliability verification test will be immediately judged as unqualified (5.4 of the 1995 edition and 5.7.6 of this edition); - Added Appendix A (Informative Appendix) Service Life Field Sampling Inspection Method; Appendix B (Informative Appendix) Reliability Verification Test Selection Guide: Appendix C (Informative Appendix) Examples of Reliability Verification Tests for Electric Energy Meters. JB50070 is one of the industry standards for electric energy meters. The following lists the expected structure of these industry standards, as well as the industry standards they replace: JB/T5467.1 "Electromechanical AC active and reactive energy meters Part 1: General requirements", replaces JB/T5467-1997: a)
b) JB/T5467.2 "Electromechanical AC active and reactive energy meters Part 2: Special requirements for long-life technology meters". This standard replaces JB/T50070-1995. Appendix A, Appendix B, and Appendix C of this standard are informative appendices. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Electrical Instruments. The drafting units of this standard: Harbin Electrical Instrument Research Institute, Shanghai Infute Electronic Technology Co., Ltd., Huali Group Co., Ltd., Ningbo Samsung Group Co., Ltd., and Zhengtai Group Zhejiang Zhengtai Instrument Co., Ltd. The main drafters of this standard: Bai Jingfang, Wang Jianghong, Fang Jiliu, and Xue Dejin. The previous versions of the standards replaced by this standard are: -JB/T50070—1995.
JB/T50070——2002
The method specified in this standard is a reliability verification test under laboratory conditions to assess whether the electric energy meter meets the reliability index specified in its product contract or product standard as the average life. The purpose of the verification test is not to obtain the specific reliability index value of the product, but to compare the reliability level (MTTF) of the verified product batch with the value specified in the product contract or product standard in advance, and make a qualified or unqualified judgment.
After strict screening, aging and debugging, the life of the static electric energy meter basically obeys the exponential distribution. The wear and failure of the vulnerable parts (such as: meter, bearing) of the electromechanical electric energy meter will not become obvious until it has been working for a long time, that is, the failure rate curve during normal operation is an approximately horizontal straight line. Therefore, this standard uses the electric energy meter life to obey the exponential distribution and uses random sampling statistical methods to conduct reliability verification tests as a comparison method recognized by both supply and demand parties. The reliability characteristic quantity of the electric energy meter is defined as the average lifespan. For repairable products, the mean working time between two adjacent failures is expressed as MTBF (mean time between failure); for non-repairable products, the mean working time before failure is expressed as MTTF (mean time to failure). Since the value of the electric energy meter itself is not high, after 10 to 20 or even 30 years of operation, the dismantled meter is generally no longer repaired. In this sense, it should be considered as a non-repairable product, so the reliability characteristic quantity is defined as MTTF. In the revision process of this standard, in addition to making partial revisions to the technical content of the original standard, special consideration was also given to the user's reliability requirements for electromechanical AC electric energy meters with a mean lifespan (MTTF) of 20 years or more. The revision of this standard provides a comparable, simplest and feasible detection basis to adapt to the development trend of promoting electromechanical electric energy meters with a mean lifespan (MTTF) of 20 years or more in my country, realize one meter per household, and thus solve the hot and difficult problems of current electricity management in my country. The reliability verification test results specified in this standard are only for accepting or rejecting conclusions, and can be used as a means of controlling and supervising product reliability, but cannot reveal the true reliability level and problems of the product. Therefore, according to the American standard (ANSIC12.1--1995), this standard recommends a field sampling inspection method for actual service life in Appendix A (Informative Appendix) for reference only. According to the statistics of the test results of electric energy meter products by the National Electrical Instrument Quality Inspection Center in recent years, the power limit coefficient K in this standard is taken as 0.25 (See the preparation instructions of this standard)
This standard will serve as an indispensable basic standard or technical basis for the reliability verification of electric energy meters, and is also an important part of the standard system for improving the electric energy meter industry.
1 Scope
Reliability requirements and assessment methods for electric energy meters
This standard specifies the reliability requirements and assessment methods for electric energy meters. JB/T50070—2002
This standard is applicable to the reliability verification test of whether the electric energy meter meets the reliability index specified in the product contract or product standard, which is the mean time to failure (MTTF).
This standard is only applicable to AC electric energy meters with a reference frequency of 50Hz. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T3187-1994 Reliability and maintainability terms (eqvEC60191-1994) GB/T17215-2002 Class 1 and 2 static AC active energy meters (IEC61036:2000, IDT) GB/T17882-1999 Class 2 and 3 static AC reactive energy meters (eqvIEC61268:1995) JB/T5467.1-20 02 Electromechanical AC active and reactive energy meters Part 1: General requirements JB/T6214-1992 Guidelines for reliability verification tests and measurement tests (exponential distribution) for instruments 3 Terms and definitions
The terms and definitions established in GB/T3187-1994, GB/T17215-2002, JB5467.1-2002 and JB/T6214-1992 and the following terms and definitions apply to this standard.
Reliability
The ability of a product to perform specified functions under specified conditions and within a specified time. 3.2
Mean life mean life (mean time to failure) The average value of the working time before the product fails (MTTF) 3.3
Compliance test
A test to prove whether the characteristics or performance of a product meet the specified requirements. 3.4
Laboratory testlaboratorytestbZxz.net
Verification test or determination test conducted under specified and controlled conditions (which may or may not simulate field conditions). 3.5
Failure
An event in which a product ceases to be able to complete its specified functions. 4. Reliability requirements
4.1 Characteristic quantity
The characteristic quantity of reliability of electric energy meters is specified as the mean life MTTF. JB/T50070—2002
4.2 Requirements
When developing new products, electric energy meters should specify the minimum acceptable reliability requirements. The reliability requirements and verification test methods of electric energy meter products in normal production should be specified in the product contract and product standards. The MTTF value and its corresponding lower limit m of the MTTF of the test can be selected from Table 1. Note: This standard recommends a method for on-site sampling inspection of the actual service life of electric energy meters, see Appendix A (Informative Appendix). Table 1 MTTF upper limit mo and MTTF lower limit m of the test 1 Average life MTTF
5 Assessment method
5.1 General
MTTF upper limit mo of the test (when Dm=3)
6.57×104
13.14×10*
16.44×10*
19.71×10*
MTTF lower limit m of the test
1.10×104
2.19×10*
3.29×104
4.38×104
5.48×104
6.57×104
5.1.1 Unless otherwise specified, the procedure for the reliability verification test of the electric energy meter shall be carried out in accordance with the relevant provisions of JB/T6214-1992. 5.1.2 The reliability assessment of the electric energy meter shall be a laboratory reliability verification test. 5.1.3 The results of the laboratory reliability verification test shall only be used as a verification test for the development of new products; in normal production, only the acceptance or rejection conclusion of the production batch shall be made.
5.2 Test plan
5.2.1 General principles for the selection of test plan
5.2.1.1 If the test time, test cost or number of failures are specified in advance, the fixed-time fixed-number truncation test plan should be selected. The reliability verification test of newly developed products should adopt the timed constant number truncation test scheme. 5.2.1.2 If it is necessary to make an acceptance or rejection judgment on the predetermined reliability characteristic quantity (mo.m) according to the predetermined judgment risk (α, β), and the total test time cannot be determined in advance, the truncation sequential test scheme should be selected. Note: The advantages and disadvantages of the two test schemes are shown in Appendix B (Informative Appendix). 5.2.1.3 If both the manufacturer and the user are willing to accept higher risks, the 5:8～5:10 high-risk timed constant number truncation test scheme in Appendix A Table A13 of B/T6214-1992 or the short-time high-risk truncation sequential test scheme of 4:8～4:10 in Table A2 can be selected.
5.2.2 Reliability verification test scheme for electric energy meters Except for the situation in 5.2.1.3, the reliability verification test of electric energy meters should adopt the truncation sequential test scheme specified in 5.2.2.1 or the timed constant number truncation test scheme specified in 5.2.2.2 as appropriate.
5.2.2.1 Truncation Sequential Test Scheme
Truncation sequential test shall be carried out according to Scheme 4:7 in Table A2 of JB/T6214-1992. At this time, α=β=0.2, Dm=3.0, the corresponding MTTF upper limit (mo) of the test is shown in Table 1, the qualified judgment table is shown in Table 2, the qualified judgment diagram, the working characteristic curve and the expected test time curve for making judgments are shown in Figures A22, A23 and A24 of 5B/T6214-1992 respectively. 5.2.2.2 Timing and fixed number truncation test scheme
Timing and fixed number truncation test shall be carried out according to Scheme 5:7 in Table A13 of JB/T6214-1992. At this time, α=β=0.2, Dm=3.0, truncation failure number r=3, test truncation time T=1.46mo, the corresponding test MTTF upper limit (mo) is shown in Table 1, and the working characteristic curve and the expected test interval curve for making judgments are shown in Figure A39 and Figure A42 of JB/T6214-1992 respectively. 2
Failure number r
Table 2 Truncation sequential test plan qualification judgment table Cumulative test time (multiples of mo)
Note: "Two" means that the test needs to be continued until the time corresponding to the first "acceptance" pointed by the arrow is a multiple of mo. General test procedure
JB/T50070-2002
Determine the test plan according to the provisions of 5.2, draw test samples according to the provisions of 5.4, and conduct the test under the test working conditions specified in 5.6. For the test samples drawn from the product batch that has passed the factory inspection, they shall be inspected according to the test items specified in 5.7.1 before being put into the reliability test. For the sample units with unqualified items (except for Class A failure), qualified unit products shall be used to replace them. During the test, record and accumulate the associated test time and failure number one by one. The test time and failure number shall be accumulated until the acceptance or rejection decision can be made according to the truncated sequential test plan, or until the truncation condition is reached according to the timed constant truncation test plan. 5.4 Determination of test samples
The samples for reliability verification test shall be products that have passed the factory inspection. The test samples shall be randomly selected from a population of no less than 200 units. The recommended sample size is shown in Table 3.
Table 3 Recommended sample size and timed constant truncation test single unit equivalent test time MTTF
Sample size units
single unit equivalent test time (t)
Note: The test working conditions are shown in Table 4. If the test current is not the basic current (1), when it is 21, the single unit equivalent test time is (1/2) t; when it is 4f, the single unit equivalent test time is (1/4) t.
5.5 Calculation of cumulative test time
5.5.1 Truncated sequential test
The cumulative test time of the truncated sequential test shall be calculated as follows: When the kth failure occurs, the cumulative test time shall be the sum of the test time of all sample units, that is: a)
Where:
Cumulative test time when the kth failure occurs, in h; When the kth failure occurs, the test time of the mth sample unit in the test sample, in h; n—a sample size, in units.
b) When no failure occurs at the decision point, the cumulative test time is the sum of the test time of all sample units, that is: T
JB/T500702002
Where:
Cumulative test time, in h;
—When reaching the decision point, the test time of the mth sample unit in the test sample, in h; tm
Sample size, in units.
According to Table 2 (qualification table), the shortest test time required for acceptance or rejection judgment of 4:7 of the truncated sequential test scheme is 0.12mo and the longest is 1.5mo.
5.5.2 Fixed-time constant truncated test
The equivalent test time t of a single unit is:
=T(n-2)
Where:
Cumulative test time, unit is h;
Equivalent test time of a single unit, unit is h
Test sample size, unit is unit.
The equivalent test time of a single unit calculated according to the above formula is shown in Table 3. (3)
5.6 Test working conditions
5.6.1 The working conditions for the reliability verification test are shown in Table 4. Except at the test point, the test should be carried out continuously under the conditions specified in Table 4. 5.6.2 The working conditions of the ambient temperature test are divided into: fine simulation see Figure 1, and coarse simulation see Figure 2. Precision simulation is more complex, but closer to the actual use conditions, so this standard recommends the use of precision simulation. Since precision simulation is more expensive to implement, the supplier and the user can negotiate to use the rough simulation ambient temperature test working conditions, but the test report must indicate that the results of the reliability verification test were conducted under the rough simulation test working conditions. Table 4 Test working conditions
Precision simulation
Ambient temperature
Working position
Power factor
Instantaneous load pulse
-10℃～45℃
Annual average
30 days (these days in a year
are distributed in a natural way)
The rest of the time sometimes reaches
-25℃~55℃
23℃~45℃
≤75%
Vertical working position±0.5°
Grid voltage and 1.2U
Basic current
Sinusoidal voltage and current, distortion factor is less than 5%Geomagnetic field
cos @ul
Coarse simulation
0℃~55℃
Amplitude: 00.51:Number: 54750 times per 5 years Temperature cycle change precision simulation see Figure 1: Coarse simulation see Figure 2 and each application time see Table 5; Voltage cycle change each application time see Table 5, U. is the reference voltage. Instantaneous load pulse test: Instantaneous load pulse test is carried out on another sample, pulse amplitude: 0～0.5Imax, 100s on and 20s off, continuous impact every 5 years, a total of 54750 times.
Cycles
Figure 1 Fixed use of indoor and outdoor instrument environment temperature precision simulation change cycle diagram c
Figure 2 Fixed use of indoor and outdoor instrument environment temperature coarse simulation change cycle diagram 5.7 Performance test of test samples
5.7.1 Test items
Basic error, starting, creep and AC voltage test. 5.7.2 Test time
5.72.1 Truncation sequential test
JB/T50070—2002
For the starting and creeping test items, if acceptance or rejection has not yet been made according to Table 2 (Scheme 4: 7 Qualification Judgment Table), the test shall be carried out at each judgment point.
For the basic error test items, the test shall be carried out only when the error of a certain sample unit compared with the average value of the measured electricity of the adjacent sample units on both sides exceeds the grade index.
For the AC voltage test items, the test shall be carried out only when other test items at 0.89mo, 1.44m and 1.50mo points have passed. For the instantaneous load pulse test of the additional sample, after the pulse number meets the requirements, the basic error, starting, creeping and AC voltage tests shall be carried out.
JB/T50070—2002
Table 5 Cyclic changes in temperature and voltage within a cycle (5 years) Single unit application time Sample size Unit
Temperature cycle changes
45 (55)
-10 (-25)
45 (55)·
Voltage cycle changes°
Grid voltage
Temperature allowable deviation ±3°C.
Single unit application time t”b
Single unit application time”b
If the test current is not the basic current 1, but 21, the single unit equivalent application time is (1/2) t' and (1/2) 1”: when it is 4I, the single unit equivalent application time is (1/4) t' and (1/4) t\
First apply high voltage (1.2U) and then connect to the grid voltage. 5.7.2.2
Timed constant truncation test
MTTF values ​​are selected as 5 years and 10 years, and only the test and the end of the test are performed. MTTF value If the MTTF value is selected as 15 years, in addition to the test for commissioning and the test completion test, a test should also be conducted at the 10-year point. If the MTTF value is selected as 20 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year and 15-year points. If the MTTF value is selected as 25 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, and 20-year points.
If the MTTF value is selected as 30 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, 20-year, and 25-year points.
t||Note 1: AC voltage test is only carried out at the end of the test. Note 2: For the instantaneous load pulse test of another sample, after the pulse number meets the requirements, basic error, starting, creeping and AC voltage tests are carried out. 5.7.3 Test conditions
Electromechanical type shall be carried out in accordance with the reference conditions specified in 6.18 and Table 21 of JB/T5467.12002 and the humidity shall be between 40% and 60%. Static type shall be carried out in accordance with the reference conditions specified in 5.6.1 and Table 20 of GB/T17215-2002 and 5.6.1 and Table 18 of GB/T17882-1999 (reactive power) The test is carried out at 40% to 60% humidity. 5.7.4 Test method
5.7.4.1 Basic error
The electromechanical type shall be carried out in accordance with 6.18 of JB/T5467.1-2002. The static type shall be carried out in accordance with 5.6.1 of GB/T17215-2002 and GB/T17882-1999 (reactive power). Measure the error e1 once at 0.1lb, cos@=1 (or sin@=1); then measure the error e2 four times at l, cos@=1 (or sin=1): calculate the average error e:
é=(er +4e2)/5 ..
The error expressed as a percentage of the average value e is taken as the basic error. 5.7.4.2 Starting2 The working conditions of the ambient temperature test are divided into: fine simulation see Figure 1, and rough simulation see Figure 2. Fine simulation is more complicated, but closer to the actual use conditions, so this standard recommends the use of fine simulation. Since the implementation of fine simulation is more expensive, the supplier and the user can negotiate to adopt the rough simulation ambient temperature test working conditions, but the test report must indicate that the results of the reliability verification test were conducted under the rough simulation test working conditions. Table 4 Test working conditions
Fine simulation
Ambient temperature
Working position
Power factor
Instantaneous load pulse
-10℃～45℃
Annual average
30 days (these days in a year
are distributed in a natural way)
The rest of the time sometimes reaches
-25℃~55℃
23℃~45℃
≤75%
Vertical working position±0.5°
Grid voltage and 1.2U
Basic current
Sinusoidal voltage and current, distortion factor is less than 5%Geomagnetic field
cos @ul
Coarse simulation
0℃~55℃
Amplitude: 00.51:Number: 54750 times per 5 years Temperature cycle change precision simulation see Figure 1: Coarse simulation see Figure 2 and each application time see Table 5; Voltage cycle change each application time see Table 5, U. is the reference voltage. Instantaneous load pulse test: Instantaneous load pulse test is carried out on another sample, pulse amplitude: 0～0.5Imax, 100s on and 20s off, continuous impact every 5 years, a total of 54750 times.
Cycles
Figure 1 Fixed use of indoor and outdoor instrument environment temperature precision simulation change cycle diagram c
Figure 2 Fixed use of indoor and outdoor instrument environment temperature coarse simulation change cycle diagram 5.7 Performance test of test samples
5.7.1 Test items
Basic error, starting, creep and AC voltage test. 5.7.2 Test time
5.72.1 Truncation sequential test
JB/T50070—2002
For the starting and creeping test items, if acceptance or rejection has not yet been made according to Table 2 (Scheme 4: 7 Qualification Judgment Table), the test shall be carried out at each judgment point.
For the basic error test items, the test shall be carried out only when the error of a certain sample unit compared with the average value of the measured electricity of the adjacent sample units on both sides exceeds the grade index.
For the AC voltage test items, the test shall be carried out only when other test items at 0.89mo, 1.44m and 1.50mo points have passed. For the instantaneous load pulse test of the additional sample, after the pulse number meets the requirements, the basic error, starting, creeping and AC voltage tests shall be carried out.
JB/T50070—2002
Table 5 Cyclic changes in temperature and voltage within a cycle (5 years) Single unit application time Sample size Unit
Temperature cycle changes
45 (55)
-10 (-25)
45 (55)·
Voltage cycle changes°
Grid voltage
Temperature allowable deviation ±3°C.
Single unit application time t”b
Single unit application time”b
If the test current is not the basic current 1, but 21, the single unit equivalent application time is (1/2) t' and (1/2) 1”: when it is 4I, the single unit equivalent application time is (1/4) t' and (1/4) t\
First apply high voltage (1.2U) and then connect to the grid voltage. 5.7.2.2
Timed constant truncation test
MTTF values ​​are selected as 5 years and 10 years, and only the test and the end of the test are performed. MTTF value If the MTTF value is selected as 15 years, in addition to the test for commissioning and the test completion test, a test should also be conducted at the 10-year point. If the MTTF value is selected as 20 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year and 15-year points. If the MTTF value is selected as 25 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, and 20-year points.
If the MTTF value is selected as 30 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, 20-year, and 25-year points.
t||Note 1: AC voltage test is only carried out at the end of the test. Note 2: For the instantaneous load pulse test of another sample, after the pulse number meets the requirements, basic error, starting, creeping and AC voltage tests are carried out. 5.7.3 Test conditions
Electromechanical type shall be carried out in accordance with the reference conditions specified in 6.18 and Table 21 of JB/T5467.12002 and the humidity shall be between 40% and 60%. Static type shall be carried out in accordance with the reference conditions specified in 5.6.1 and Table 20 of GB/T17215-2002 and 5.6.1 and Table 18 of GB/T17882-1999 (reactive power) The test is carried out at 40% to 60% humidity. 5.7.4 Test method
5.7.4.1 Basic error
The electromechanical type shall be carried out in accordance with 6.18 of JB/T5467.1-2002. The static type shall be carried out in accordance with 5.6.1 of GB/T17215-2002 and GB/T17882-1999 (reactive power). Measure the error e1 once at 0.1lb, cos@=1 (or sin@=1); then measure the error e2 four times at l, cos@=1 (or sin=1): calculate the average error e:
é=(er +4e2)/5 ..
The error expressed as a percentage of the average value e is taken as the basic error. 5.7.4.2 Starting2 The working conditions of the ambient temperature test are divided into: fine simulation see Figure 1, and rough simulation see Figure 2. Fine simulation is more complicated, but closer to the actual use conditions, so this standard recommends the use of fine simulation. Since the implementation of fine simulation is more expensive, the supplier and the user can negotiate to adopt the rough simulation ambient temperature test working conditions, but the test report must indicate that the results of the reliability verification test were conducted under the rough simulation test working conditions. Table 4 Test working conditions
Fine simulation
Ambient temperature
Working position
Power factor
Instantaneous load pulse
-10℃～45℃
Annual average
30 days (these days in a year
are distributed in a natural way)
The rest of the time sometimes reaches
-25℃~55℃
23℃~45℃
≤75%
Vertical working position±0.5°
Grid voltage and 1.2U
Basic current
Sinusoidal voltage and current, distortion factor is less than 5%Geomagnetic field
cos @ul
Coarse simulation
0℃~55℃
Amplitude: 00.51:Number: 54750 times per 5 years Temperature cycle change precision simulation see Figure 1: Coarse simulation see Figure 2 and each application time see Table 5; Voltage cycle change each application time see Table 5, U. is the reference voltage. Instantaneous load pulse test: Instantaneous load pulse test is carried out on another sample, pulse amplitude: 0～0.5Imax, 100s on and 20s off, continuous impact every 5 years, a total of 54750 times.
Cycles
Figure 1 Fixed use of indoor and outdoor instrument environment temperature precision simulation change cycle diagram c
Figure 2 Fixed use of indoor and outdoor instrument environment temperature coarse simulation change cycle diagram 5.7 Performance test of test samples
5.7.1 Test items
Basic error, starting, creep and AC voltage test. 5.7.2 Test time
5.72.1 Truncation sequential test
JB/T50070—2002
For the starting and creeping test items, if acceptance or rejection has not yet been made according to Table 2 (Scheme 4: 7 Qualification Judgment Table), the test shall be carried out at each judgment point.
For the basic error test items, the test shall be carried out only when the error of a certain sample unit compared with the average value of the measured electricity of the adjacent sample units on both sides exceeds the grade index.
For the AC voltage test items, the test shall be carried out only when other test items at 0.89mo, 1.44m and 1.50mo points have passed. For the instantaneous load pulse test of the additional sample, after the pulse number meets the requirements, the basic error, starting, creeping and AC voltage tests shall be carried out.
JB/T50070—2002
Table 5 Cyclic changes in temperature and voltage within a cycle (5 years) Single unit application time Sample size Unit
Temperature cycle changes
45 (55)
-10 (-25)
45 (55)·
Voltage cycle changes°
Grid voltage
Temperature allowable deviation ±3°C.
Single unit application time t”b
Single unit application time”b
If the test current is not the basic current 1, but 21, the single unit equivalent application time is (1/2) t' and (1/2) 1”: when it is 4I, the single unit equivalent application time is (1/4) t' and (1/4) t\
First apply high voltage (1.2U) and then connect to the grid voltage. 5.7.2.2
Timed constant truncation test
MTTF values ​​are selected as 5 years and 10 years, and only the test and the end of the test are performed. MTTF value If the MTTF value is selected as 15 years, in addition to the test for commissioning and the test completion test, a test should also be conducted at the 10-year point. If the MTTF value is selected as 20 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year and 15-year points. If the MTTF value is selected as 25 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, and 20-year points.
If the MTTF value is selected as 30 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, 20-year, and 25-year points.
t||Note 1: AC voltage test is only carried out at the end of the test. Note 2: For the instantaneous load pulse test of another sample, after the pulse number meets the requirements, basic error, starting, creeping and AC voltage tests are carried out. 5.7.3 Test conditions
Electromechanical type shall be carried out in accordance with the reference conditions specified in 6.18 and Table 21 of JB/T5467.12002 and the humidity shall be between 40% and 60%. Static type shall be carried out in accordance with the reference conditions specified in 5.6.1 and Table 20 of GB/T17215-2002 and 5.6.1 and Table 18 of GB/T17882-1999 (reactive power) The test is carried out at 40% to 60% humidity. 5.7.4 Test method
5.7.4.1 Basic error
The electromechanical type shall be carried out in accordance with 6.18 of JB/T5467.1-2002. The static type shall be carried out in accordance with 5.6.1 of GB/T17215-2002 and GB/T17882-1999 (reactive power). Measure the error e1 once at 0.1lb, cos@=1 (or sin@=1); then measure the error e2 four times at l, cos@=1 (or sin=1): calculate the average error e:
é=(er +4e2)/5 ..
The error expressed as a percentage of the average value e is taken as the basic error. 5.7.4.2 Starting50mo points when other test items have been qualified. For the instantaneous load pulse test of another sample, after the pulse number meets the requirements, the basic error, starting, creeping and AC voltage tests are carried out.
JB/T50070—2002
Table 5 Temperature and voltage cycle changes in one cycle (5 years) Single unit application time Sample size Unit
Temperature cycle change
45 (55)
-10 (-25)
45 (55)·
Voltage cycle change°
Grid voltage
Temperature allowable deviation ±3℃
Single unit application time t”b
Single unit application time”b
If the test current is not the basic current 1, but 21, the single unit equivalent application time is (1/2) t' and (1/2) 1”: when it is 4I, the single unit equivalent application time is (1/4) t' and (1/4) t\
First apply high voltage (1.2U) and then connect to the grid voltage. 5.7.2.2
Timed constant truncation test
MTTF values ​​are selected as 5 years and 10 years, and only the test and the end of the test are performed. MTTF value If the MTTF value is selected as 15 years, in addition to the test for commissioning and the test completion test, a test should also be conducted at the 10-year point. If the MTTF value is selected as 20 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year and 15-year points. If the MTTF value is selected as 25 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, and 20-year points.
If the MTTF value is selected as 30 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, 20-year, and 25-year points.
t||Note 1: AC voltage test is only carried out at the end of the test. Note 2: For the instantaneous load pulse test of another sample, after the pulse number meets the requirements, basic error, starting, creeping and AC voltage tests are carried out. 5.7.3 Test conditions
Electromechanical type shall be carried out in accordance with the reference conditions specified in 6.18 and Table 21 of JB/T5467.12002 and the humidity shall be between 40% and 60%. Static type shall be carried out in accordance with the reference conditions specified in 5.6.1 and Table 20 of GB/T17215-2002 and 5.6.1 and Table 18 of GB/T17882-1999 (reactive power) The test is carried out at 40% to 60% humidity. 5.7.4 Test method
5.7.4.1 Basic error
The electromechanical type shall be carried out in accordance with 6.18 of JB/T5467.1-2002. The static type shall be carried out in accordance with 5.6.1 of GB/T17215-2002 and GB/T17882-1999 (reactive power). Measure the error e1 once at 0.1lb, cos@=1 (or sin@=1); then measure the error e2 four times at l, cos@=1 (or sin=1): calculate the average error e:
é=(er +4e2)/5 ..
The error expressed as a percentage of the average value e is taken as the basic error. 5.7.4.2 Starting50mo points when other test items have been qualified. For the instantaneous load pulse test of another sample, after the pulse number meets the requirements, the basic error, starting, creeping and AC voltage tests are carried out.
JB/T50070—2002
Table 5 Temperature and voltage cycle changes in one cycle (5 years) Single unit application time Sample size Unit
Temperature cycle change
45 (55)
-10 (-25)
45 (55)·
Voltage cycle change°
Grid voltage
Temperature allowable deviation ±3℃
Single unit application time t”b
Single unit application time”b
If the test current is not the basic current 1, but 21, the single unit equivalent application time is (1/2) t' and (1/2) 1”: when it is 4I, the single unit equivalent application time is (1/4) t' and (1/4) t\
First apply high voltage (1.2U) and then connect to the grid voltage. 5.7.2.2
Timed constant truncation test
MTTF values ​​are selected as 5 years and 10 years, and only the test and the end of the test are performed. MTTF value If the MTTF value is selected as 15 years, in addition to the test for commissioning and the test completion test, a test should also be conducted at the 10-year point. If the MTTF value is selected as 20 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year and 15-year points. If the MTTF value is selected as 25 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, and 20-year points.
If the MTTF value is selected as 30 years, in addition to the test for commissioning and the test completion test, tests should also be conducted at the 10-year, 15-year, 20-year, and 25-year points.
t||Note 1: AC voltage test is only carried out at the end of the test. Note 2: For the instantaneous load pulse test of another sample, after the pulse number meets the requirements, basic error, starting, creeping and AC voltage tests are carried out. 5.7.3 Test conditions
Electromechanical type shall be carried out in accordance with the reference conditions specified in 6.18 and Table 21 of JB/T5467.12002 and the humidity shall be between 40% and 60%. Static type shall be carried out in accordance with the reference conditions specified in 5.6.1 and Table 20 of GB/T17215-2002 and 5.6.1 and Table 18 of GB/T17882-1999 (reactive power) The test is carried out at 40% to 60% humidity. 5.7.4 Test method
5.7.4.1 Basic error
The electromechanical type shall be carried out in accordance with 6.18 of JB/T5467.1-2002. The static type shall be carried out in accordance with 5.6.1 of GB/T17215-2002 and GB/T17882-1999 (reactive power). Measure the error e1 once at 0.1lb, cos@=1 (or sin@=1); then measure the error e2 four times at l, cos@=1 (or sin=1): calculate the average error e:
é=(er +4e2)/5 ..
The error expressed as a percentage of the average value e is taken as the basic error. 5.7.4.2 Starting
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