This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of small dry-type transformers for control or lighting. This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of small dry-type transformers for control or lighting. This standard applies to small dry-type transformers for control or lighting (hereinafter referred to as transformers) that are air-cooled, fixed or movable, built-in or other types, single-phase or multi-phase. The rated power supply voltage shall not exceed 1000 V, the rated frequency shall be 50 Hz, and the rated pickup capacity f is unlimited. For isolation transformers or electronic power transformers, unless otherwise specified, they should also be used as a reference. This standard does not apply to explosion-proof dry-type transformers for mining, transformers filled with liquid media, and transformers filled with powder materials. JB/T 9646-1999 Small dry-type transformers for control or lighting JB/T9646-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 9646-1999
Small-sized transformers for control or lighting
1999-08-01 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T9646-1999
This standard is a revision of ZBK43003-88 "Small-sized transformers for control or lighting". The revisions to this standard are as follows:
1 The standard writing format is strictly in accordance with GB/T1.1-1993. 2 The composition type of the product model has been revised, the representation method of the standard code and sequence number has been cancelled, and the code for special use environment has been added.
3 The referenced standards have been confirmed according to the current standards, and the contents in the standard text have been revised accordingly. This standard replaces ZBK43003-88 from the date of implementation. This standard is 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 Appliance Factory. The drafters of this standard are: Lin Ran, Zhang Hongbin, Wang Zhaoping, Xu Jingyi. This standard was first formulated in 1988 and first revised in 1998. 1 Scope
Machinery Industry Standard of the People's Republic of China
Small Dry-Type Transformers for Control or Lighting
JB/T9646-1999
Replaces ZBK43003-1988
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage of small dry-type transformers for control or lighting.
This standard applies to small dry-type transformers for control or lighting (hereinafter referred to as transformers) of air self-cooling, fixed or movable, built-in or other types, single-phase or multi-phase. The rated power supply voltage shall not exceed 1000V, the rated frequency shall be 50Hz, and the rated output capacity shall not be limited. For isolation transformers or electronic power transformers, unless otherwise specified, they should also be used as a reference. This standard does not apply to explosion-proof dry-type transformers for mining, transformers filled with liquid media, and transformers filled with powder materials. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in the standards. When this standard is published, 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. GB1094.1—1996
GB/T2423.16—1990
GB/T2423.17—1993
GB/T2828—1987
GB/T2900.11992
GB/T2900.15—1997
GB4208—1993
GB64501986
3 Definitions
Power transformers Part 1 General (eqvIEC60076—1:1993) Basic environmental testing procedures for electric and electronic products Test J: Mildew growth test method Basic environmental testing procedures for electric and electronic products Test K a: Salt spray test method
Batch inspection counting sampling procedure and sampling table Basic terms of electrical terms
Electrical terms Transformer, voltage regulator, mutual inductor, reactor (neqIEC60050 (421): 1990, IEC60050 (321): 1986) Enclosure protection level (IP code)
Dry-type power transformer (eqvIEC60726: 1982) This standard adopts the following definitions, and the definitions of other terms are in accordance with GB/T2900.1 and GB/T2900.15. 3.1 AC voltage and AC current
The AC voltage and AC current values ​​described in this standard, unless otherwise specified, refer to the root mean square value. 3.2 Independent winding transformer
A transformer in which one or more input windings are separated from the output winding by at least basic insulation. 3.3 Control transformer
Independent winding transformer that supplies power to control circuits (e.g., control circuits of machine tools and low-voltage electrical appliances, signal circuits, interlocking devices, etc.). 3.4 Lighting transformer
Hedgehog winding transformer that supplies power to lighting fixtures with voltages lower than the power supply voltage. 3.5 Rated power supply voltage
Under normal operating conditions, the nominal voltage applied to the input end of the transformer. For multi-phase transformers, it refers to the nominal value of the line voltage of the power supply network.
Approved by the State Bureau of Machinery Industry on August 1, 1999 and implemented on January 1, 2000
3.6 Rated output current
JB/T9646-1999
The nominal current output by the transformer during normal operation at the rated frequency and rated output voltage. Its value is calculated from the rated output capacity and the rated output voltage.
3.7 Rated output voltage
The nominal value of the output voltage of the transformer in normal operation when the rated output current is output at the rated frequency and rated power supply voltage. 3.8 Rated output capacity
refers to n times the product of the rated output voltage and the rated output current, where n is the number of phases, and n=1 for a single-phase transformer. If the transformer has more than one output winding, or more than one output winding with tapping, the rated output capacity refers to the sum of the products of the rated output voltage and the rated output current in each circuit when the transformer supplies power to various circuits at the same time. 3.9 No-load input capacity
The input capacity of the transformer at the rated frequency, rated power supply voltage and no-load. 3.10 No-load output voltage
The output voltage of the transformer at the rated frequency, rated power supply voltage and no-load. 3.119
Short-circuit impedance
The voltage value applied to the input winding when the output winding is short-circuited and the input winding produces the rated current at room temperature. The short-circuit impedance is expressed as a percentage of the rated power supply voltage and converted to the reference temperature. The reference temperature value is shown in Table 1. Table 1 Reference temperature value
Insulation heat resistance grade
Reference temperature value,
3.12 Rated thermal power
Under the conditions of rated frequency, rated power supply voltage, and rated output capacity, when the power factor is equal to 1, the maximum power of the transformer for continuous operation.
3.13 Basic insulation
refers to the insulation on the live body used to prevent electric shock. 3.14 Supplementary insulation
Independent insulation that supplements basic insulation, used to prevent the risk of electric shock in the event of basic insulation breakdown. 3.15 Double insulation
Has both basic insulation and supplementary insulation. 3.16 Reinforced insulation
refers to the insulation system on the live body, and its degree of protection against electric shock is equivalent to double insulation. Insulation system is insulation composed of one or more materials, or of several layers of materials, and which cannot be tested individually like basic insulation or supplementary insulation. 3.17 Portable transformer
A transformer that can be moved during operation or can be easily moved from one place to another when connected to a power supply. 3.18 Fixed transformer
A transformer that is fixedly installed during operation, that is, a transformer that is not easily moved from one place to another. 3.19 Shell
The protective body of the transformer body is called the shell. It includes all accessible metal parts, such as shafts, handles, knobs, operating rods, metal fastening screws, metal boxes attached to the surface of insulating materials, and other similar structural parts, but does not include inaccessible metal parts. 3.20 Rated ambient temperature
The highest ambient temperature at which the transformer can operate continuously under normal operating conditions, with the code ta. The specified rated ambient temperature does not exclude the transformer from short-term operation at an ambient temperature not exceeding t+10°C. 2
3.21 Clearance
JB/T9646-1999
The minimum air gap between exposed live parts, or between exposed live parts and other metal parts. 3.22 Creepage distance
The minimum distance along the surface of the insulator between exposed live parts, or between exposed live parts and other metal parts. 3.23 Working voltage
The maximum AC voltage value applied to the insulation system during normal operation under rated power supply voltage. The working voltage of the insulation system between two unconnected windings refers to the higher voltage of the two windings. 4 Product classification
4.1 Product type
According to the purpose of the product, it is divided into two types: control transformer and lighting transformer. Control transformer is a fixed transformer. Lighting transformer, except for lighting transformers used for machine tools, is a portable transformer. 4.2 Product Variety
Transformer varieties are classified according to rated output capacity. All transformers of the same type and capacity are of the same variety. Transformer varieties are recommended to be selected according to the R10 series priority number system. 4.3 Product Specifications
For transformers of the same type, the specifications are divided according to different combinations of rated power supply voltage and rated output voltage. Products with the same type, type, rated power supply voltage and rated output voltage combination are products of the same specifications. 4.4 Product Model
4.4.1 Product Model Composition Type
口-口
Special Use Environment Code
Rated Output Capacity, VA
Design Serial Number
Product Model Letters
The Meaning of Product Model Letters See Table 2
Table 2 Meaning of Product Model Letters
4.5 Structural Dimensions
“Single” Phase
“Three” Phase
“Control” Use
“Lighting” Use
The structural dimensions and installation dimensions of the product shall be in accordance with the relevant technical conditions. General technical requirements
Words representing
5.1 General
The design, manufacture and delivery of transformers must ensure that they do not endanger the safety of people and the surrounding environment when installed, used and maintained in accordance with relevant technical regulations. Therefore, they must be inspected through all the specified test items and can only be put into use if they meet the requirements of this standard. 5.2 Conditions of use
5.2.1 Normal conditions of use
a) The altitude shall not exceed 1000m;
b) The maximum ambient temperature shall be +40℃, the maximum monthly average temperature shall not exceed +30℃, and the annual average temperature shall not exceed +20℃;c) The relative humidity of the air shall not exceed 95%;
d) The ambient air shall not contain harmful gases or dust that may corrode metals or damage insulation. During use, the transformer shall not be corroded by water, rain or snow;
e) The waveform of the power supply voltage is similar to a sine wave. 5.2.2 Special conditions of use
According to the provisions of 1.2.2 of GB64501986.
5.3 Performance in use
5.3.1 Rated output capacity
a) The rated output capacity is specified in VA; b) The recommended rated output capacity of single-phase or multi-phase transformers shall be selected according to the R10 series priority number system. 5.3.2 The combination of rated power supply voltage and rated output voltage shall be selected according to Table 3. Table 3 Voltage combination
Rated power supply voltage
660380220127380×220
Rated output voltage
1103624126
380220127
a) The rated power supply voltage and rated output voltage listed in Table 3 can be combined arbitrarily according to needs. Rated output voltage can be obtained from the winding with higher rated output voltage by tapping the tap; Note: Voltages other than those listed in Table 3 shall be determined by negotiation between the user and the manufacturer. b) The distribution of rated output capacity at each rated output voltage shall be determined according to user requirements. 5.3.3 Rated frequency and number of phases
a) The rated frequency is 50Hz;
b) The number of phases shall be determined according to user requirements.
5.3.4 Change of input voltage
If the transformer is equipped with taps for adjusting the input voltage, these taps should indicate the input voltage value of the corresponding tap. The taps should preferably be one level per 5% of the rated power supply voltage. 5.3.5 Output voltage and output current under load For a transformer operating at rated ambient temperature, rated frequency and rated power supply voltage, the difference between its output voltage and the rated output voltage when a rated load with a power factor of 1 is applied should not exceed ±5%. Whether this requirement is met should be checked by measuring the output voltage after the transformer reaches stable operation. The rated output voltage and output current marked on the transformer should comply with 3.6 to 3.8 and be calculated and verified by the rated output capacity. 5.3.6 No-load output voltage
The no-load output voltage value of the transformer when the rated power supply voltage is applied should not exceed 110% of the rated output voltage value. 5.3.7 Short-circuit impedance
When the short-circuit impedance value marked on the transformer nameplate is the standard value in Table 8, the actual measured conversion value shall not exceed the allowable deviation in Table 9. 5.3.8 Temperature rise
The transformer shall not have excessively high temperature during normal operation, and shall be verified by temperature rise test. The temperature rise limit is shown in Table 4. 4
Parts
Class A insulation
Class E insulation
Class B insulation
Terminals
JB/T 9646-1999
Temperature rise limit
Determined according to adjacent insulation
5.4 Mechanical strength
The transformer shall have sufficient mechanical strength, and its structure shall ensure that no loosening or displacement of parts occurs during normal use, installation and transportation.
Screw connections, whether electrical or for other purposes, shall be able to withstand the mechanical stress that occurs during use. Screws with a nominal diameter less than 2.8mm should be screwed into metal parts. Soft metals such as zinc and aluminum or metals that are easy to move are not allowed to be used as screws. Screws used for mechanical connection between different parts should have a locking structure to prevent loosening. 5.5 Stability
5.5.1 Waterproof and moisture-proof ability
a) The shell of the transformer should have the ability to prevent rainwater from falling vertically and entering the shell; b) The transformer should have moisture resistance during normal operation. Whether it meets the requirements of this article shall be judged by the tests specified in this standard. 5.5.2 Anti-corrosion ability
a) In order to avoid the transformer from losing safety due to rust of iron parts, all iron parts of the transformer shall have reliable anti-corrosion protection. Whether it meets the requirements of this article shall be checked and judged by the anti-corrosion test specified in this standard. b) The protective ability of the paint layer on the outer surface of the transformer core and the anti-corrosion ability of the nickel-plated or tin-plated copper parts used for wiring shall be considered to meet the requirements if there is no rust on the surface after the moisture treatment specified in this standard. After the moisture treatment, if rust appears on the sharp edge of the test piece, or if the yellow thin layer on any surface can be wiped off, it can be ignored and is still considered to meet the requirements.
5.6 Safety requirements
5.6.1 Requirements for protection against electric shockbzxz.net
a) The iron core, clamps and shell of the transformer should be well connected, and there should be a grounding device to ensure good grounding; b) The studs (bolts) of the grounding device should have sufficient mechanical strength and be treated with anti-corrosion, and measures should be taken to prevent the nuts from loosening. The size of the grounding studs (bolts) should be selected according to Table 5;
Table 5 Grounding stud (bolt) size
Rated current
Stud (bolt)
10≤16
c) The input winding and the output winding must be separated by insulation that meets the requirements, and the insulation structure must ensure that there is no possibility of electrical connection between them.
5.6.2 Short circuit and overload protection
In normal operation, in order to ensure the safety of the transformer when short circuit or overload occurs, a protective device (such as fuse, thermal release, etc.) can be installed. This device should be able to reliably play a protective role under the specified capacity limit. 5.6.3 Structure
a) The structure of the transformer must meet all the specified requirements such as mechanical strength and electromagnetic performance, and must meet the specified heat resistance, moisture resistance and waterproof requirements;
b) The structural material of the transformer is not allowed to use flammable materials (such as celluloid, etc.); c) In the transformer structure, the fastener connection and the connection between the terminal and the wire should have reliable measures to prevent loosening; d) Except for special requirements, the lighting transformer should have a protective shell, and the control transformer may not have a protective shell. 5
JB/T9646-1999
Except for special requirements (such as machine tool lighting transformer), the protective shell shall be IP11 level specified in GB4208. 5.6.4 Components
a) Transformer components, such as switches, plug fuses, flexible wires and cables and other similar components, in addition to the relevant clauses specified in this standard, shall also comply with the provisions of the corresponding standards.
The long-term working current of the fuse is generally 1.1 times the rated current. b) Thermal releases, overload releases and other protective devices shall have sufficient current-breaking capacity. Overload protection shall not use thermal releases positioned by soldering. The overload protection device shall not operate when the power is closed. 5.6.5 Internal wiring
a) The internal wiring of the transformer and the electrical connections between the various components shall have sufficient insulation protection; b) The small holes on the metal plate through which the insulating wire passes shall have a fillet radius of at least 1.5mm or protected by an insulating sleeve (pad), c) Bare conductors should be fixed and the distance between them, or the distance between the conductor and the shell, should meet the requirements of creepage distance and electrical clearance:
Creepage distance and electrical clearance should not be less than that specified in Table 6. Table 6 Creepage distance Cr and electrical clearance C1
Insulation part
Between input live parts and output live parts, mm
Between input terminals and output terminals, mm
Between adjacent input terminals or between adjacent output terminals, mm
Between basic (or supplementary) insulation live parts and shell, mm
U≤50
50U200
200
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