JB/T 56171-1999 Product quality classification of small dry-type transformers for control or lighting purposes JB/T56171-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T56171
Mei La Chuang
1999-12-30
Wa Xian Ji Dong
2000-06-01
JB/T561711999
This standard is based on JB/T9646-1999 "Control or Lighting Small Dry-Type Transformer Product Quality Classification" to revise JB/T56171-94 "Control or Lighting Small Dry-Type Transformer Product Quality Classification". The main technical differences between this standard and JB/T 56171-94 are as follows: 1 The structure and writing format of the standard are strictly modified in accordance with the provisions of GB/T1.1-1993. 2 The principles of quality classification are in accordance with the provisions of GIB/T12707, replacing JB/Z291. The referenced standards were confirmed according to the current standards, and the relevant contents were modified. 3
Defined the "main test item rate" and "compulsory test item rate". 4
5In the project assessment, the concept of "Class C non-conformity" was cited. 6The assessment items of "test conditions", "quality stability" and "marking" were cancelled. This standard replaces JB/T from the date of implementation. 55171-94. This standard was proposed and managed by the National Technical Committee for Transformer Standardization. The drafting units of this standard are: Shenyang Transformer Research Institute, Harbin Explosion-proof Electric! . The main drafters of this standard are: Ding Hongsheng, Zhang Hongbin, Xu Jingyi. This standard was first formulated in 1990, code-named JB/DQ2648-90. In 1994, it was renamed JB/T56171-94. It was reviewed and revised in 1999.
1 Scope
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JB/T561711999
JB /T5617194
This standard specifies the principles for the classification of product quality grades, sampling, quality requirements, inspection and evaluation methods for small dry-type transformers for control or lighting.
This standard is applicable to the evaluation of product quality grades in China that is currently extended by the JB/T9646 standard. 2 Referenced standards
The texts contained in the following standards constitute the clauses of this standard through citation in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 2828—1987bZxz.net
GB/T 8170—1987
GB/T 12707-—1991
JB/T 5054.51999
JB/T9646—1999
3 Definitions
This standard adopts the following definitions.
Batch-by-batch inspection, sampling by counting, wall sequence and sampling table (applicable to the inspection of continuous batches) numerical finalization rules
Guidelines for the basic classification of industrial products
Integrity of product drawings and design documents
Small down-type transformers for control or lighting
3.1 Rate of mandatory items
The percentage of the number of mandatory items that meet a certain quality characteristic level to the total number of mandatory items. 3. 2 Main test item rate
The percentage of the number of main test items that reach a certain quality characteristic level to the total number of main test items. 4 Principles of quality grade division
According to the principle of product quality grade division specified in GB/T12707, the quality level of small flat transformers for control or lighting is divided into three levels: superior products, first-class products and qualified products. 4.1 Superior products
The quality standards of superior products must reach the international advanced level, and the actual quality level must reach the advanced level in the past five years compared with similar foreign products.
4.2 First-class products
The quality standards of first-class products must reach the general international level, and the actual quality level must reach the general level of similar international products. 4.3 Qualified products
Organize production according to the general level standards of my country, and the actual quality level must meet the requirements of the corresponding standards. 5 Sampling
Wa Extremely Slow 1999-12-30
2000-06-01 Small Cable
5.1 Sampling of Finished Products
JB/T561711999
5.1.1 Sampling of finished products is carried out among the products already in stock in the manufacturer. When the batch is N16, no assessment is required. 5.1.2 Product sampling According to the provisions of GB/T2828 standard, a normal inspection once-through scheme is adopted. The general inspection level is 1, and the qualified quality level (AQL> is 2.5, N=16, n≥5. 5.2 Semi-finished product sampling
3.2.1 Iron core
Randomly select iron cores with the same or similar diameter as the sample iron core at the manufacturing site. 5.2.2 Coil
Randomly select coils with the same voltage level and capacity and coil structure as the sample at the manufacturing site. 5.2.3 Shell
Randomly select products with the same or similar structural size as the sample at the manufacturing site. 6 Requirements for quality grade assessment
6.1 After the single product is assessed item by item according to Table 3, the national item rate of the mandatory items and the item rate of the main items are calculated. The item rates of qualified products, first-class products and superior products should comply with Table 1
Table 1 Evaluation of the quality grade of a single product
Item rate
Required special items
Main examination items
Qualified products
85% and above reach the qualified level, and the quality characteristics of the rest
are Class C unqualified
First-class products
90% and above reach the first-class level, and the rest
reach the standard
1Class C unqualified refers to the quality characteristics of the unit product that are slightly inconsistent with the regulations. 2 Data processing after the item rate calculation should be in accordance with GB/T 8170 6.2 Evaluation of batch product quality grade shall be carried out in accordance with the provisions of Table 2. Table 2 Evaluation of batch product quality grade
151~280
281~50050
Qualified products
All 5 sample units are qualified products
At least 19 sample units are qualified products
At least 30 samples are qualified products
At least 47 samples are qualified products||t t||Product batch quality level
First-class products
All 5 sample units are first-class products
Excellent products
90% reach excellent, 5% reach
Excellent products
All 5 sample units are excellent products
There are at most 1 first-class products, the rest are excellent
There are at most 3 qualified products, the rest are first-class
There are at most 7 100 qualified products and the rest are first-class products.
There are at most 12 qualified products and the rest are first-class products.
Note: N is the batch size of the normal inspection sampling plan, and n is the sample size, that is, the number of units sampled. 6.3 Product quality characteristics requirements and inspection methods shall be carried out in accordance with Table 3. 2
There are at most 7 first-class products or 6 first-class products, 1 qualified product and the rest are superior products.
There are at most 12 first-class products or 10 -
quality products, 2 qualified products, the rest are excellent
Product standards
Type test
Output voltage and
Output current under load
No-load current
Short-circuit impedance
No-load output voltage
Creep current and electrical insulation
Ground continuity
Continuous resistance measurement (not subjected to
moisture treatment)
Insulation electrical strength
No-load loss
Total loss
Burrs on iron core
Uneven end surface of iron core
Insulation wrapping of coil
Reading of coil
Insertion dimension of coil
JB/T561711999
Table 3 Requirements and inspection methods for ink quality
Quality characteristics requirements
Comply with JB/T 9646 standard
Conform to JB/T9646 standard requirements
Conform to JBT9646 standard requirements
Not less than standard gauge;
Conform to standard requirements
Daning 50MO
Conform to standard
Conform to standard push
Greater than 100Mo
Conform to standard requirements
Equal to standard value to
6% less than standard value
Equal to standard value to
5% less than standard value
Conform to standard requirements. Surface paint is firm
Allow the wire gauge of the section day
Used in calculation books and letters
No serious defects, penetration
Conform to the requirements of the drawings
3 mm or more than the standard requirements,b
KF200M0
5% less than the standard value
5% less than the actual standard
Inspection methods and requirements
Inspect product standards or prototypes, check
whether the product has a model registration certificate
Inspect test reports or retests
Inspect test reports or retests
Inspect as per standards
Standard inspection
Inspect as per standards
Test as per standards
Inspect as per standards
Test as per standards, the results are the same
Conform to standards,
Surface paint is firm, appearance quality is good
Conform to calculation books and drawings
Conform to standards Meet the drawing requirements
No minor defects, penetration
Meet the drawing requirements,
Positive and negative deviations are less than
Half of the given margin
Check according to the standard grain
Take any three pieces with the largest measured value as the standard, measure with a micrometer, at the first sound
Measure the visible part of the iron yoke (close to the clamp
Three pieces of small test)
Use a micrometer to measure the wire gauge
Check the wire winding process
No defects, check under penetration and no dry records, appearance inspection (two changes to immersion paint)
Meet the drawing requirements,
Positive and negative deviations are less than
-Quality product regulations
Carry out a peripheral appearance inspection of the line, and the measurement is not
|The width of the core along the front line
Appearance inspection
Drawings, technical documents
User evaluation
JB/T561711999
Table 3 (Complete)
Quality characteristics requirements
"No serious defects, no minor defects
No serious defects, no minor defects
No serious defects, no minor defects
No more than
No more than 6"No more than 210 errors
(1) The product can meet
use requirements
[2) Can serve users
Note: "*" is a mandatory test item, and the others are the main items.
(1) Product use efficiency
|tt||Good results
《2）Can serve users seriously
(3)Product quality reaches
the better level of similar domestic products
(1)The product has good use effect and reliable operation
（2）Can serve users seriously and have wide application
（3）Quality assurance, and enjoys a good reputation among similar domestic products
Technical requirements for particle inspection
Inspect according to standard drawings
Inspect according to JB/T5554.5 standard.
(1)Inspect user opinions and processing results in recent years
（2）User opinions are of sufficient quality to be recorded
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