Some standard content:
ICS29.180
Machinery Industry Standard of the People's Republic of China
JB/T7068—2002
Replaces JB/T7068—1993
Metal expanders for instrument transformer
Metal expanders for instrument transformer2002-07-16Published
2002-12-01Implemented
Published by the State Economic and Trade Commission of the People's Republic of ChinaForeword.
2 Normative references||tt ||3 Terms and definitions,
4 Product classification..
4.1 Structural type, code and basic diameter
4.2 Product model
5 Technical requirements.
5.1 Conditions of use,
Performance requirements.
Structural requirements..
4 Factory documents..
Test methods,
Radial position deviation and axial position deviation inspection pH test,
Sealing performance test
Expansion pressure test
Volume-pressure curve (Vp curve) test. 6.6 Mechanical life test
Inspection rules.
Routine test,
7.2 Type test,
8 Marking, packaging, transportation and storage
Main contents of product nameplate
Packaging and transportation
JB/T7068--2002
JB/T7068—2002
This standard is a revision of JB/T7068-1993 "Metal expanders for transformers" and is revised based on the current domestic production technology level of metal expanders for transformers. Compared with B7068-1993, the main changes of this standard are as follows: the relevant content of the new structure expander is added; the definition of "free state" is added; the "minimum critical volume" and "dead zone volume" are combined and uniformly defined as "minimum critical volume"; the definition of "rated stroke" is modified; the definition of "average oil temperature variation range" is added; the temperature requirements of "indoor type" and "outdoor type" are added; the deviation values of "radial position" and "axial position" are modified; the test method of "expansion pressure" is modified; the value of "residual pressure" of vacuum test is modified; the number of "mechanical life test" is modified. This standard replaces JB70681993. This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Transformers. The drafting units of this standard are: Shenyang Transformer Research Institute, Air Force Shenyang Ordnance Repair Factory, Shenyang Elastic Component Manufacturing Co., Ltd., Shenyang Kangjian Electric Co., Ltd., and Hunan Yiyang Electric Equipment Factory. The main drafters of this standard are Lu Wanlie, Yuan Yintang, Shao Wei, Xin Changfu and Guo Hui. This standard was first issued in 1993.
1 Scope
Metal expanders for transformers
JB/T7068—2002
This standard specifies the terms and definitions, product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of metal expanders for oil-immersed transformers (hereinafter referred to as expanders). This standard applies to metal expanders used in various oil-immersed transformers, and also to expanders used in other oil-immersed electrical equipment. Non-metal expanders can refer to this standard. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, 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/T2828-1987 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Golden corrugated expander
A container with variable volume, used in a fully sealed oil-immersed transformer to compensate for the volume change of transformer oil due to temperature change, and to keep its internal pressure basically unchanged when the transformer is operating normally. 3.2
Corrugated expander
An expander composed of one or more expansion joints welded in annular shape on the outer diameter. The expansion joint is made of two corrugated sheets welded in annular shape on the inner diameter, and its longitudinal section is corrugated. The expansion joint is a variable volume expansion unit of the expander. 3.3
Stacked corrugated expander
An expander made of stacked corrugated pipes without annular welds. The longitudinal section of the stacked bellows is tangent to the wave crest arcs of adjacent waves. The stacked bellows are the volume-variable expansion units of the expander. 3.4
Box-type expander
An expander assembled by connecting one or more expansion boxes with metal pipes. The expansion box is made of two disc-shaped corrugated sheets welded in an annular manner, and its longitudinal section is box-shaped. The expansion box is the volume-variable expansion unit of the expander. 3.5
Series-type expander
An expander assembled by connecting one or more expansion boxes in series at the center hole with metal bellows. The expansion box is made of two disc-shaped corrugated sheets with center holes welded in an annular manner on the outer diameter. The expansion box with a center hole is the volume-variable expansion unit of the series-type expander.
Internal oil expander
An expander in which the expansion unit is in contact with transformer oil inside and with the atmosphere outside during use. JB/T7068—2002
External oil type expander
In use, the inside of the expansion unit is in contact with the atmosphere, and the outside is in contact with the transformer oil. 3.8
Basic diameter of the expansion unit
The basic size of the effective volume of the expansion unit. It is recommended to adopt the value specified in Table 1 of 4.1. Free state
The state in which the expansion unit is neither inward pressure nor outward pressure (no vacuum inside) is called the free state. 3.10
Free height
The axial dimension of the expansion unit in the free state. 3.11
Rated expansion height
The maximum expansion height that can be achieved when the expansion unit meets the mechanical life requirements specified in 5.2.5. 3.12
Limit expansion height
The expansion height corresponding to the limit working point. The definition of the limit working point is shown in 3.14 and 3.15. 3.13
Volume-pressure relationship curve (VP curve) The relationship curve between the volume V and the pressure p of the expansion unit is called the V-p curve. The "upper limit working point", "lower limit working point" and "upper effective working point" and "lower effective working point" should be marked on the V-p curve. 3.14
Upper limit working point
A point on the V-p curve. Under the action of internal pressure, if the volume of the expansion unit exceeds this point, it cannot return to the free height before pressurization after pressure release.
Lower limit working point
A point on the V-p curve. Under the action of external pressure (internal vacuum or external oil pressure), if the volume of the expansion unit is lower than this point, it cannot return to the free height before pressurization after pressure release. By height. Note: The direction of action of the pressure p of the external oil expander is opposite to that of the internal oil expander. 3.16
Effective working point
The working point used to determine the effective volume.
Note: The effective working point should be determined after taking an appropriate safety interval based on the limit working point. The size of the safety interval is specified by the product technical conditions. 3.17
Effective volume
The difference in volume corresponding to the "upper effective working point" and the "lower effective working point" marked on the V-P curve. .3.18
Critical volume
a) Maximum critical volume: the volume corresponding to the upper limit working point; b) Minimum critical volume: the volume corresponding to the lower limit working point. Note: The minimum critical volume is also called the dead zone volume. 3.19
Expansion pressure
The pressure required for the expansion unit to reach the rated expansion height. 3.20
Rated stroke
JB/T7068—-2002
The expansion height of the expansion unit from the "lower effective working point" to the "upper effective working point" and then back to the "lower effective working point", or from the "upper effective working point" to the " The total stroke of a complete cycle from the "lower effective working point" to the "upper effective working point" is called the "rated stroke".
Mechanical life
The number of times the expansion unit continuously performs the "rated stroke" action without leakage or other mechanical damage within the range of use conditions in 5.1.
Radial position deviation
For a corrugated expander or a stacked corrugated expander at the rated expansion height, the difference between the distance from any point on the outer ring line of each expansion unit to the center line of the lower flange and the value specified in the drawing is called the "radial position deviation"3.23
Axial position deviation
For a corrugated expander or a stacked corrugated expander at rated expansion height, the height difference between any two points on the outer ring line of the top expansion unit to the lower flange plane is called "axial position deviation". 3.24
Average oil temperature variation range
Oil temperature parameter used when calculating the oil volume increment V. Note: The oil temperature is different at different positions inside the transformer. 4 Product classification
Structural type, code and basic diameter
Structural type, code and basic diameter are shown in Table 1. Table
Structural type
Corrugated type
Stacked corrugated type
String type
Basic diameter
200, 250, 280, 300 (330), 400 (380), 450 (460), 500 (480, 540), 630 (600), 800 (760), 1000200, 250, 280, 300- (330), 400 (380) , 450 (460), 500 (480, 540), 630 (600), 800 (760), 1000280, 315 (350), 400 (430), 500 (540), 600, 630 (680), 800 (850) 1000.
280, 315 (350),
400 (430),
Note: Other structures are determined by negotiation between the user and the manufacturer. 4.2 Product Model
Product model is marked as follows:
500 (540),
600, 630 (680), 800 (850)
JB/T7068—2002
Example 1:
PB—480×10
Corrugated expander, basic diameter 480mm, 10 sections, internal oil type. Example 2:
PBD—460×9
Stacked corrugated expander, basic diameter 460mm, 9 waves, internal oil type. Example 3:
PH600×4
Box expander, basic diameter 600mm, 4 boxes, internal oil type. Example 4:
PC—450×4
Series expander, basic diameter 450mm, 4 boxes, internal oil type. 5 Technical requirements
Usage conditions
The expander shall meet the following usage conditions.
5.1.1 Ambient temperaturebzxZ.net
Daily average shall not exceed:
Low: Indoor type 5℃
Outdoor type -30℃
Average oil temperature variation range: Indoor type -5℃～80℃ Outdoor type -30℃～80℃
5.1.2 Atmospheric conditions
There shall be no serious pollution and corrosive media in the atmosphere. Number of expansion units (sections, waves, boxes)
Oil filling method (internal oil type is not indicated, external oil type is indicated by W) Basic diameter
Design serial number
Structural type code
Expander
Note: If the use conditions are inconsistent with these regulations, the user should propose it in the order contract and negotiate with the manufacturer to solve it. 5.2 Performance requirements
5.2.1 Appearance
a) The geometric dimensions of the product should meet the requirements of the drawings. b)
The inner and outer surfaces of the expander must be clean and dry, and the contact surface with the transformer oil should ensure that the pH is neutral. For corrugated expanders and stacked corrugated expanders, the radial position deviation and axial position deviation should not exceed 5mm at the rated expansion height.
Sealing performance
JB/T7068—2002
For bellows expanders and stacked bellows expanders, the two ends are limited and inflated to 0.05MPa at the free height, and no leakage is allowed. a)
b) For cassette expanders and single cassettes of cassette expanders, the two sides are limited and inflated to 0.1MPa at the height specified in the product drawing, and no leakage is allowed.
c) The expander shall not leak in a vacuum state with an internal residual pressure of no more than 5Pa. 5.2.3 Expansion pressure deviation
The expansion pressure deviation shall comply with the provisions of the product technical conditions. 5.2.4 Volume-pressure relationship curve (VP curve) deviation The VP curve deviation refers to the deviation of the effective volume corresponding to the "upper effective working point" and the "lower effective working point". The allowable deviation value shall comply with the provisions of the product technical conditions.
5.2.5 Mechanical life
The number of times the expansion unit continuously performs the "rated stroke" action should be no less than 10,000 times. There should be no leakage or other mechanical damage. 5.2.6 Process treatment
The expansion unit should be subjected to stress annealing treatment, and products made of hydrogen-containing materials and products using hydrogen in the manufacturing process should be dehydrogenated.
5.3 Structural requirements
The internal oil type expander should have the following devices (supplied with the product when the user requires it): a) Devices that facilitate oil filling and venting:
b) Devices that facilitate external observation of the transformer oil level. 5.4 Factory documents
The manufacturer should provide the user with the following information: a) Product installation (use) instructions:
b) Inspection certificate.
6 Test method
6.1 Radial position deviation and axial position deviation inspection Use the inflation and pressurization method to make the product reach the rated expansion height, and then use an angle ruler and a ruler to check. 6.2 pH test
Use pH test paper to check the pH of the contact surface between the expansion unit and the transformer oil. It is qualified if the pH is neutral. 6.3 Sealing performance test
For bellows expanders and stacked bellows expanders, at free height, limit the two ends to inflate and pressurize to 0.05MPa, put in water for a)
5min, there should be no bubble overflow:
For box expanders and cassette expanders, use a single box test, at the height specified in the product drawing, limit the two sides to inflate and pressurize to b)
0.1MPa, put in water for 5min, there should be no bubble overflow: When the expander is in a vacuum state with an internal residual pressure of no more than 5Pa, apply industrial alcohol with a concentration of no less than 90% on all welds, and the pointer of the resistance vacuum gauge does not swing to be qualified. 6.4 Expansion pressure test
In the free state, the expansion unit or expander is filled with clean water, and pressurized with water to reach the rated expansion height. At this time, the pressure generated by the stable value of the water column height is the expansion pressure. This pressure value should meet the requirements of the product technical conditions. 6.5 Volume-pressure curve (VP curve) test Box expanders and tandem expanders are tested with a single box, and the products with the largest number of expansion units are selected for the corrugated expanders and stacked corrugated expanders, and then converted into the V-p curve of the expansion unit. The V-p curve can be measured by water pressure method. First measure the minimum critical 5
JB/T7068--2002
volume (dead volume), and then measure the volume corresponding to each point with a pressure of 2kPa, 4kPa, 6kPa\pkPa (p is the pressure value of the "upper limit working point" specified in the product technical conditions). The measured data is plotted into a V-p curve using coordinate paper. Its deviation should comply with the provisions of the product technical conditions.
6.6 Mechanical life test
The test sample should be selected from the product that has completed the test in 6.3. On the special equipment, the expansion unit or expander is made to continuously perform the "rated stroke action". The completion of one "rated stroke" action is counted as one life test. The number of tests shall not be less than 10,000 times, and each time is about 1 minute. The test can be carried out by air pressure method or water pressure method. Then, the test specified in item c) of 6.3 shall be carried out again. Only after the test is passed can the test product be deemed qualified.
7 Inspection rules
Expander tests are divided into routine tests and type tests. 7.1 Routine tests
a) Appearance inspection:
b) Sealing performance test, test method see 6.3. 7.2 Type test
7.2.1 The expander shall be subjected to type test in any of the following cases. When the trial production is completed or the production is resumed after suspension of production for more than half a year: a)
Product structure, process or material has When there is a major change: b)
When the national quality supervision agency makes a request: c)
When in mass production, it is carried out every three years. d)
7.2.2 Type test items include:
Routine test items:
Radial position deviation, axial position deviation, according to GB/T2828-1987, a normal inspection sampling plan is adopted, the general inspection level is I, the qualified quality level (AQL) is 2.5, and the test method is shown in 6.1; c)
Acidity test of the contact surface between the expansion unit and the transformer oil. The test method is shown in 6.2 Expansion pressure test. The test method is shown in 6.4; d)
Volume-pressure relationship curve (Vp curve) test. The test method is shown in 6.5; e)
Mechanical life test. The test method is shown in 6.6.8 Marking, packaging, transportation and storage
Main content of product nameplate
Manufacturer name:
Product model and name:
c) Effective volume;
d) Manufacturing date;
e) Registered trademark.
8.2 Packaging and transportation
a) After the product is inspected and qualified, effective dust and moisture-proof measures should be taken in time to ensure the cleanliness of the product. The packaging box should be made of wood or other materials with good strength. Measures should be taken to prevent the expander from being damaged during packaging and transportation:b)
c) Product certificates, product installation and operating instructions and other factory documents and disassembled parts, spare parts, etc. need to be dust-proof and moisture-proof packaging, and should be packed in the packaging box together.
8.3 Storage
a) The product should be stored in a warehouse without corrosive gas: b) Ambient temperature: -40℃～50℃;
Relative humidity: not more than 90%:
d) The height of the product from the ground should not be less than 200mm. JB/T7068—2002
People's Republic of China
Mechanical Industry Standard
Metal expander for mutual inductor
JB/T7068-2002
Published and distributed by Machinery Industry Press
No. 22, Baiwanzhuang Street, Beijing
Postal code: 100037
Format 890mm×1240mm1/16·0.75 sheet·1 9,000 words, 1st edition, 1st printing, December 2002
Book number: 15111·7141
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