SJ 20765-1999 General specification for 28Vd.c. inductors for laboratory use

This specification specifies the classification, requirements, quality assurance regulations and delivery preparation of 28Vd.c. iron core inductors (hereinafter referred to as inductors). This specification applies to iron core inductors with an inductive current rating of less than 100A for military switches, relays and circuit breakers for laboratory use. SJ 20765-1999 General Specification for 28Vd.c. Inductors for Laboratory Use SJ20765-1999 Standard download decompression password: www.bzxz.net

Military standard of the electronics industry of the People's Republic of China FL5950
SJ20765--1999
General specification for 28 V d.c. inductors for laboratory use
Published on November 10, 1999
Implemented on December 1, 1999
Ministry of Information Industry of the People's Republic of China
3 Approved
Military standard of the electronics industry of the People's Republic of China General specification for 28 V d.c. inductors for laboratory use
Inductor, 28 V d.c. laboratory testGeneral specification fon
1 Scope
1.1 Subject content
SJ 20765--1999
This specification specifies the classification, requirements, quality assurance provisions and delivery preparation of 28Vd.c. iron core inductors (hereinafter referred to as inductors).
1.2 Scope of application
This specification applies to iron core inductors with an inductive current rating of less than 100A for military switch relays and circuit breakers for laboratory use.
1.3 Classification
1.3.1 Inductors are divided into two types according to the inductive current rating: Class 1 inductors: rated current of 2~100A; Class 2 inductors: rated current of less than 2A. 2 Referenced documents
GJB360A-96 Test methods for electrical and electronic components 3 Requirements
3.1 First article
When specified in the contract or order, a first article inspection sample should be provided. 3.2 Inspection and Tests
Products submitted in accordance with this specification shall be inductors that have passed the inspections and tests specified in this specification. 3.3 Materials
The materials used in inductors shall comply with the provisions of this specification and the relevant specifications. If a certain material is not specified, the material that meets the requirements of this specification shall be used. 3.3.1 Metallic Materials
Metallic materials shall be corrosion-resistant or shall be treated for corrosion resistance. 3.3.2 Incompatible Metals
Unless properly protected against electrochemical corrosion, incompatible metals shall not be used in direct contact. 3.3.3 Selection of Materials
For materials and parts not clearly specified in this specification, the selection of process, technical conditions and standards shall comply with the relevant provisions of the Ministry of Information Industry of the People's Republic of China issued on November 10, 1999 and implemented on December 1, 1999.
3.3.3. 1 Standard push parts
$J 207651999
Preferably, standard parts (such as screws, bolts, screw boats, locating pins, etc.) should be used, and the relevant standards should be met. The specifications of standard parts should be marked to ensure their interchangeability. 3.4 Design and structure
3.4.1 General
The electric shocker should comply with the specified design, structure and dimensions (see Appendix A). 3.4.2 Washers
The washers used to separate the magnetic gap should be non-magnetic stainless steel or brass or bronze. 3.4.3 Through bolts
The through bolts should be made of steel and adopt the expansion process to form a tamping-resistant structure. 3.4.4 Mounting surface
The mounting surface should be flat, with a flatness of 0.38mml. 3.4.5 Installation
The installation dimensions of Class 1 and Class 2 inductors shall comply with the provisions in Appendix A, respectively. 3.5 Resistance
When the inductor is tested in accordance with the provisions of 4.6.2, the two-terminal simplified circuit R shall be: Class 1 inductor: 0.277±10%0;
Class 2 inductor: 8.15±10%Q.
3.6 Characteristic curve (current-time)
a. When Class 1 inductors are inspected or tested in accordance with the provisions of 4.6.3, their current-time characteristic curve shall be within the area shown in Figures B1 and B2 in Appendix B (Supplement). For ease of reference, the energy storage curve is given in Appendix C. b. When Class 2 inductors are inspected in accordance with the provisions of 4.6.3, their current-time characteristic curve shall comply with the provisions of 4.6.3.
3.7 Temperature rise
When tested in accordance with the provisions of 4.6.4, the temperature rise of the coil shall not exceed 85K. 3.8 Terminal strength
The terminal of the inductor is specified in Appendix A Figure A1 and Figure A12 respectively. 3.8.1 After the inductor has completed the threaded terminal strength test in accordance with the provisions of 4.6.5 and then energized, there shall be no short circuit, breakdown, looseness or rotation.
3.9 Dielectric withstand voltage
When tested in accordance with the provisions of 4.6.6, the inductor shall be able to withstand the specified test voltage without arcing, sparking, insulation breakdown or damage.
3.10 Interchangeability
For ease of assembly and use, all parts produced by the same contractor shall be completely interchangeable. 3.11 Marking
The inductor shall be marked in accordance with the provisions of 5.3. The marking shall be clear and firm. 3.12 Dimensions
The dimensions of class 1 and class 2 inductors shall comply with the provisions of Figure A1 and Figure A12 in Appendix A, respectively. 3.13 Quality
SJ 20765--1999
Inductors shall be manufactured using a production process that ensures quality consistency and shall be able to be freely disassembled and replaced. There shall be no other defects that affect the life, performance or appearance. 4 Quality Assurance Provisions
4.1 Inspection Responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. Unless otherwise specified in the contract or order, the contractor may use special and other equipment approved by the superior competent authority and suitable for completing the inspections specified in this specification. The relevant competent authority has the right to inspect any of the inspection items described in this specification. 4.1.1 Responsibility for Conformity
All products must comply with the requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality management system. If the contract does not include any inspection requirements not specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency inspection does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products. 4.2 Inspection classification
The inspections specified in this specification are divided into:
a. First article inspection;
b. Quality consistency inspection.
4.3 Inspection conditions
Unless otherwise specified, all tests shall be carried out under the standard atmospheric conditions for tests specified in GJB360A. 4.4 First article inspection
The first article inspection shall be carried out under conditions approved by the superior department, and the samples used shall be produced by the equipment and processes commonly used in production. For the first article inspection, one sample shall be submitted and all inspections and requirements specified in this specification shall be completed. 4.5 Quality consistency inspection
4.5.1 Quality consistency inspection
The quality consistency inspection items shall be carried out in accordance with the provisions of Table 1. Any product that fails in the inspection or test in the following order will interrupt the next inspection. Table 1 Quality consistency inspection
Inspection or test
Appearance and structure
Characteristic line (current-time)
Feather end strength
Dielectric voltage
Requirement clause number
Note: 1) Only two products are tested for each inspection batch. 4.5.2 Failure
If any product fails during the inspection or test, the quality consistency inspection fails. 4.5.3 Inspection batch
Method clause number
… Each inspection batch should be produced under basically the same conditions and submitted for inspection at the same time. Product group of the same model structure-3~
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4.5.4 Sampling plan
SJ20765—1999
100% of the products are tested according to the provisions of Table 1. Products that fail any of the tests in Table 1 cannot be delivered for use. 4.5.5 Handling of nonconformities
If a certain inspection batch fails the quality consistency inspection, the contractor shall take corrective measures on the raw materials, process or both based on the assurance of product quality. Corrective measures shall be taken for all products that can be repaired, manufactured with basically the same materials and process under basically the same conditions, and are considered to have the same failure mode. Before taking corrective measures approved by the relevant departments, the acceptance and delivery of the products shall be suspended. After taking corrective measures, re-inspection shall be carried out on additional samples (the competent department shall decide whether to inspect all or only the items that originally failed). If the re-inspection still fails, the relevant non-conformity information and corrective measures taken shall be provided to the competent department. 4.6 Inspection method
4.6.1 Appearance and structure
Inspect the inductor to verify whether its material, design structure, dimensions, marking and processing quality meet the requirements of the corresponding clauses.
4.6.2 Resistance
With the coil current cut off, place the inductor at a temperature of 25±2°C for at least 4 hours, and measure its coil resistance using a single-arm (Wheatstone) bridge or other similar method and it should meet the requirements of Article 3.5. 4.6.3 Characteristic curve (current time)
Class 1 inductor: Under steady-state currents of 5.0A and 25.0A, obtain the characteristic curve of current versus time of Class 1 inductor by using an oscilloscope and appropriate display means. A variable resistor with sufficient capacity is connected in series with this type of inductor and then connected to a 28±0.5V DC power supply. By adjusting the variable resistor, the current is adjusted to each specified value. A switch device with a rebound time of less than 1ms is used. When the inductor circuit is closed, the characteristic curve of the current versus time of the inductor can be obtained. The characteristic curve of the current is stable at 5.0+0.5A as shown in Figure B1: The characteristic curve of the steady-state current is 25.0±0.5A as shown in Figure B2. When calibrating the inductor, if the current response is above the curve (the inductance is too small), the gasket thickness should be reduced. If the current response is below the curve (the inductance is too high), the gasket thickness should be increased. After the inductor is calibrated, all rivets are fixed. Finally, a voltage of 28±0.5V is applied to the circuit, and the variable resistor connected in series in the circuit is adjusted (instead of adjusting the voltage) to adjust the current to the specified value. Class 2 inductors: Use a 0.13mm thick shim between each core and the upper magnetic plate shown in Figure A12. Under the conditions of 1A, 28Vd.c., use an oscilloscope and a certain series resistor to adjust the current to obtain the current-time characteristic curve of this type of inductor. When the inductor is excited by a bounce-free switching device and the voltage of the series resistor is controlled, the characteristic curve of the inductor can be displayed. Place shims (0.05mm) between each core and the upper magnetic plate to adjust the air gap of the inductor until the 95% current stable point (3LiR) reaches 135±5ms. During the calibration of the inductor, the M6 ​​screws that clamp the upper magnetic plate and the core must be kept firmly in place. 4.6.4 Temperature rise
The temperature rise test of the coil is carried out with the voltage of 28±2Vd.c. and the cycle period of 25% on and 75% off, and the cycle rate is 10 times/min, so that the coil is energized (the current of the class 1 inductor is 25A, and the current of the class 2 inductor is 1.95A). The temperature rise is determined by comparing the resistance value of the line at a known temperature with the resistance value of the coil after the temperature stabilizes under the above cycle state. When the phase-to-phase resistance value is measured three times in succession within 0.5h, the temperature of the coil can be considered to be stable. At this time, the minimum resistance value is obtained, so that the final temperature can be calculated using the following formula. T=R/r(234.5 +I) - 234.5
Where: known temperature, \C
SJ 20765—1999
r——resistance value at known temperature,;
R measured resistance (maximum value):
T final temperature, C.
The temperature rise is the difference between the calculated final temperature value and the known temperature value. The temperature rise should not exceed 85K. 4.6.5 Terminal Strength
a. The threaded terminal of a Class 1 inductor should be able to withstand a tensile force of 220N: a Class 2 inductor should be able to withstand a tensile force of 110N. The force should be applied gradually in either direction. b. The threaded lead of class 1 inductors should be able to withstand a torque of 8.5Nm; class 2 inductors should be able to withstand a torque of 0.5Nm. The torque is applied to the lead screw head, and the direction of action should be parallel to the lead. 4.6.6 Dielectric Withstand Voltage
The inductor is tested according to the provisions of GJB360A--96 Method 301, and the test voltage is 50Hz and the effective value is 1000V. When the test is completed, the inductor should meet the requirements of Article 3.9. 5 Delivery Preparation
5.1 Packaging and Storage
The inductor should be packaged and stored in the manufacturer according to the freight routine of the contractor. 5.2 Packing
The inductor packaged according to Article 5.1 should be packed in an appropriate packaging box. 5.3 Marking
The inductor should be marked with the model, manufacturer's trademark, production date or product batch number. The outer packaging box should be marked with the manufacturer's name and trademark. 6.1 Intended use 6.1.1 The inductors specified in this specification are intended for use in military switches, relays, circuit breakers, and laboratory DC inductive loads. 6.2 Contents of order documents The order documents shall specify the following: 6.2.1 Order requirements a. Name and number of this specification b. Model: G. If it is different from the provisions of 5.L, there shall be a packaging description. 6.3 Definitions 6.3.1 Response curves (current-time) Response curves (curtent versus time) The response curve of current versus time is a measure of the hysteresis of current increase due to self-inductance. 6.3.2 Stored energy Stored energy is the Joule energy stored in a magnetic field. When the switch is in the open circuit state, the stored energy will be released. 6.3.3 Dissimilar metals When two metal specimens are in contact or electrically connected to each other in a conductive solution and a current is generated, they are called dissimilar metals.
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SJ 20765—1999
Appendix A
28d.c. Inductor structure diagram
(Supplement)
A11 The dimensions of class 1 inductors are specified by Figures A2 to A11, and the dimensions of class 2 inductors are specified by Figure A12.
A2 All copper parts, bolts, nuts and flat washers should be cadmium-plated or zinc-plated. A3 For class 1 inductors with a current greater than 25A, they can be connected in parallel to reach the specified current. M6 hexagonal nut,
flat washer (18 pieces)
insulator
insulating sleeve
Figure A1
left support
insulating washer
(14 pieces）
Figure A10
Figure A11 Schematic diagram of 28V d.c. inductor
upper stacked steel sheet
B right support
lower stacked steel sheet
SJ 20765-1999
lead end
coil (1 piece)
Figure A3 upper stacked steel sheet (61 pieces)
Unit: mm
0.35mm thick 35Q165 silicon steel sheet
dip in varnish.
0.35mm thick 35Q165 silicon steel sheet
Dip in varnish.
Figure A4: Lower replacement steel sheet (61 pieces)
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SJ 20765—1999
t50.8-- 68.3 -wwW.bzxz.Net
4×m10
6.0mm thick low carbon steel.
Left and right brackets (1 piece each)
Figure A6 side plates (2 pieces)
Right bracket
4.8mm thick low carbon steel.
6.0mm thick low carbon steel.
4×@10
Figure A7 Top plate (1 piece)
SJ20765-1999
0Gr18Ni9 pin
Spacer (non-magnetic, 2 pieces)
3.8mm thick alloy or fiberboard
Insulator (1 piece)
Figure A10 Bushing (7 pieces)
Phenolic resin
Phenolic resin
Insulating bushing (4 pieces)
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Mounting hole 2x8
108x51×10
Mild steel| |tt||32 brass or
bronze washer
$32x76
YisP, copper
108x76x6
mild steel
Su20765-1999
M6×16
lock washer
coil (0.8mm.1400 turns)
outer diameter 76, 76
25×10x[0
phenolic plate
steel flat head screw
sealed with epoxy resin after installation
Figure A122 Class 28Vd.c.Inductor schematic diagram
SJ 20765—1999
Appendix B
1 Class inductor characteristic curve
[Supplement)
B1 The characteristic curve with a steady-state current of 5A should be within the dashed area of ​​Figure B1, and the characteristic curve with a steady-state current of 25A should be within the dashed area of ​​Figure B2.
Current (A)
Figure B11 Class inductor characteristic curve (5A)
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Time (ms)
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