Foreword
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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces JB/T 5555-2001 Transformers for machine tools, and the following main technical changes have been made with respect to JB/T 5555-2001:
——the rated supply voltage and rated output voltage of the transformer have been increased to 660V;
——the classification of rated insulation voltage has been changed, and 660V has been adjusted to 690V;
——"Installation class II" has been canceled in the installation class;
——the voltage value and duration of power-frequency withstand voltage test have been adjusted in the dielectric performance test;
——the cyclic damp heat test at a high temperature of 40℃ for a test period of 6 days and nights has been specified in humidity resistance test.
——the specific requirements for no-load loss of transformers have been specified;
——the inducted withstand voltage test has been canceled in sampling test;
——the efficiency test has been specified as a special test.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of Chengdu Machine Tool Electrical Appliance Research Institute.
The previous editions of this standard are as follows:
——JB/T 5555-1991 and JB/T 5555-2001.
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Introduction
Through the revision of this standard, the technical requirements and inspection rules of transformers for machine tools are further standardized and updated, which can be used as the basis for the design, production and use of single-phase control transformers with AC 50Hz (or 60Hz), rated supply voltage to 660V, rated output voltage to 660V and rated output power to 3,000VA, so as to fully meet the market demands and use needs.
These transformers are used in the electrical systems of machine tools and other mechanical equipment as power transformers for control power, lighting power, signal power and electronic equipment.
Transformers for machine tools
1 Scope
This standard specifies the terms and definitions, symbols, classification, characteristics, relevant information of products, normal use, installation and transportation conditions, structure and performance requirements and tests of transformers for machine tools (hereinafter referred to as transformers).
This standard is applicable to single-phase control transformers.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2900.1 Electrotechnical terminology - Fundamental terms
GB/T 2900.15 Electrotechnical terminology - transformer, instrument transformer, voltage regulator and reactor
GB/T 5169.10-2006 Fire hazard testing for electric and electronic products - Part 10: Glow/hot-wire based test methods - Glow-wire apparatus and common test procedure
GB/T 5169.11-2006 Fire hazard testing for electric and electronic products - Part 11: Glowing/hot-wire based test methods - Glow-wire flammability test method for end-products
GB 5226.1-2008 Electrical safety of machinery - Electrical equipment of machines - Part 1: General requirements
GB/T 13384 General specifications for packing of mechanical and electrical product
GB 14048.1-2006 Low-voltage switchgear and controlgear - Part 1: General rules
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.1, GB/T 2900.15 and GB 14048.1-2006 as well as the following apply.
3.1.1
transformers for machine tools
transformers with two or more electrical isolation windings, which are suitable for the electrical systems of machine tools and other mechanical equipment, and are used as the power supply of control circuits, lighting circuits, signal circuits and electronic equipment
3.1.2
rated supply voltage
nominal voltage applied to the transformer input terminal under normal operating conditions
3.1.3
rated output voltage
nominal value of transformer output voltage under normal operating conditions
3.1.4
rated output power
product of the rated output voltage and rated output current of the transformer. When the transformer has multiple independent output windings, the rated output power is equal to the sum of the product of the rated voltage and the rated current of each output winding
3.1.5
no-load output voltage
no-load output voltage at rated supply voltage and rated frequency
3.1.6
load output voltage
output voltage of rated power at rated supply voltage and rated frequency
3.1.7
output voltage of instantaneous power
output voltage of instantaneous power at rated supply voltage and rated frequency
3.2 Symbols
The main symbols specified in this document are as follows:
Ue——the rated supply voltage;
UH——the rated output voltage;
Ui——the rated insulation voltage;
Uk——the no-load output voltage;
Um——the load output voltage;
Umφ——the output voltage of instantaneous power.
4 Classification
4.1 Transformers may be classified into shell type and heart type according to the structure.
4.2 Transformers may be classified into vertical type and horizontal type according to installation type.
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Classification
5 Characteristics
5.1 Structural type
5.2 Specifications and parameters
5.3 Overall dimension and installation dimension
6 Product information
6.1 Information
6.2 Marking
6.3 Instructions for installation, operation and maintenance
6.4 Packaging
7 Normal use, installation and transportation conditions
7.1 Normal use conditions
7.2 Installation conditions
7.3 Transportation and storage conditions
8 Structural and performance requirements
8.1 Structural requirements
8.2 Performance requirements
9 Test
9.1 Test classification
9.2 Compliance with structural requirements
9.3 Verification of performance requirements
Figure 1 Temperature rise test circuit
Figure 2 No-load loss test circuit
Figure 3 No-load output voltage test circuit
Figure 4 Test circuit for output voltage of instantaneous power
Figure 5 Efficiency test circuit
Table 1 Basic parameters
Table 2 Minimum clearance in the air
Table 3 Minimum creepage distance
Table 4 Power-frequency withstand voltage test voltages
Table 5 Allowable limit temperature rise
Table 6 No-load loss
Table 7 Load output voltage value
Table 8 Instantaneous power value
Table 9 Efficiency
Table 10 Sampling scheme
Table 11 Insulation resistance values
