JB/T 5555-2025 Transformers for machine tools English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
J32
Professional Standard of the People’s Republic of China
JB/T 5555-2025
Transformers for machine tools
机床控制变压器
(English Translation)
Issue date: 20XX-XX-XX Implementation date: 20XX-XX-XX
Issued by the Ministry of Industry and Information Technology of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions, symbols
4 Classification
5 Characteristics
6 Related product documentation
7 Normal operating, installation and transport conditions
8 Structural and performance requirements
9 Inspection rules
10 Test methods
Figure 1 — Temperature rise test circuit
Figure 2 — No-load loss test circuit
Figure 3 — No-load output voltage test circuit
Figure 4 — Output voltage test circuit under instantaneous power conditions
Figure 5 — Efficiency test circuit
Table 1 — Basic parameters
Table 2 — Minimum electrical clearances in air
Table 3 — Minimum creepage distances
Table 4 — Power-frequency withstand voltage test values
Table 5 — Maximum permissible temperature rises
Table 6 — No-load loss values
Table 7 — Load output voltage values
Table 8 — Instantaneous power values
Table 9 — Efficiency
Table 10 — Sampling schemes
Table 11 — Insulation resistance values
Machine tool control transformers
1 Scope
This document provides the classification of machine tool control transformers, specifies the characteristics, related product documentation, normal operating, installation and transport conditions, structural and performance requirements, and inspection rules, and describes the corresponding test methods.
This document is applicable to the manufacture of single-phase control transformers with AC 50 Hz (or 60 Hz), rated supply voltage up to 690 V, rated output voltage up to 690 V, and rated output capacity up to 3000 VA.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2900.1-2008, Electrotechnical terminology — Basic terms
GB/T 5169.10-2017, Fire hazard testing for electric and electronic products — Part 10: Glowing/hot-wire based test methods — Glow-wire apparatus and common test procedure
GB/T 5169.11-2017, Fire hazard testing for electric and electronic products — Part 11: Glowing/hot-wire based test methods — Glow-wire flammability test method for finished products
GB/T 5226.1-2019, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
GB/T 13384-2008, General specifications for packaging of mechanical and electrical products
GB/T 14048.1-2023, Low-voltage switchgear and controlgear — Part 1: General rules
3 Terms and definitions, symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.1-2008 and GB/T 14048.1-2023, as well as the following, apply.
3.1.1
machine tool control transformer
A transformer suitable for use in the electrical systems of machine tools and other mechanical equipment, serving as a power source for control circuits, lighting circuits, signal circuits and electronic equipment, and having two or more electrically isolated windings.
3.1.2
rated supply voltage
The nominal voltage applied to the transformer input terminals under normal operating conditions.
3.1.3
rated output voltage
The nominal value of the transformer output voltage under normal operating conditions.
3.1.4
rated output capacity
The rated output capacity is equal to the product of the rated output voltage and the rated output current of the transformer. When the transformer has multiple independent output windings, the rated output capacity is the sum of the products of the rated voltage and the rated current of each output winding.
3.1.5
no-load output voltage
The output voltage at no-load under rated supply voltage and rated frequency.
3.1.6
load output voltage
The output voltage at rated supply voltage and rated frequency when delivering the rated output power.
3.1.7
output voltage under instantaneous power conditions
The output voltage at rated supply voltage and rated frequency when delivering the instantaneous power.
3.2 Symbols
The main symbols defined in this document are as follows:
Uₑ — Rated supply voltage;
UH — Rated output voltage;
Ui — Rated insulation voltage;
Uk — No-load output voltage;
Um — Load output voltage;
Umφ — Output voltage under instantaneous power conditions.
4 Classification
4.1 By construction
Classified into shell-type and core-type.
4.2 By mounting type
Classified into vertical and horizontal mounting.
5 Characteristics
5.1 Construction type
Machine tool control transformers (hereinafter referred to as "transformers") are generally of open construction, and may also be supplied with an enclosure if required.
5.2 Specifications and parameters
5.2.1 Specifications
Transformers are classified by rated output capacity as:
40 VA, (50 VA), 63 VA, 100 VA, (150 VA), 160 VA, 250 VA, (300 VA), 400 VA, (500 VA), 630 VA, (800 VA), 1000 VA, (1500 VA), 1600 VA, (2000 VA), 2500 VA, 3000 VA.
Note: The number series without parentheses are preferred.
5.2.2 Parameters
5.2.2.1 Basic parameters
The basic parameters of transformers shall comply with Table 1 or be determined according to user requirements.
5.2.2.2 Rated frequency
The rated frequency of transformers is 50 Hz (or 60 Hz).
5.2.2.3 Rated insulation voltage
The rated insulation voltage of transformers is:
60 V, 100 V, 160 V, 250 V, 320 V, 500 V, 690 V.
5.2.2.4 Rated duty
Transformers are suitable for continuous duty at rated load.
5.3 Overall dimensions and mounting dimensions
The overall dimensions and mounting dimensions of transformers shall comply with the requirements of the specific product standards.
6 Related product documentation
Standard
JB/T 5555-2025 Transformers for machine tools (English)
JB/T 5555-2025 Transformers for machine tools English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
J32
Professional Standard of the People’s Republic of China
JB/T 5555-2025
Transformers for machine tools
机床控制变压器
(English Translation)
Issue date: 20XX-XX-XX Implementation date: 20XX-XX-XX
Issued by the Ministry of Industry and Information Technology of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions, symbols
4 Classification
5 Characteristics
6 Related product documentation
7 Normal operating, installation and transport conditions
8 Structural and performance requirements
9 Inspection rules
10 Test methods
Figure 1 — Temperature rise test circuit
Figure 2 — No-load loss test circuit
Figure 3 — No-load output voltage test circuit
Figure 4 — Output voltage test circuit under instantaneous power conditions
Figure 5 — Efficiency test circuit
Table 1 — Basic parameters
Table 2 — Minimum electrical clearances in air
Table 3 — Minimum creepage distances
Table 4 — Power-frequency withstand voltage test values
Table 5 — Maximum permissible temperature rises
Table 6 — No-load loss values
Table 7 — Load output voltage values
Table 8 — Instantaneous power values
Table 9 — Efficiency
Table 10 — Sampling schemes
Table 11 — Insulation resistance values
Machine tool control transformers
1 Scope
This document provides the classification of machine tool control transformers, specifies the characteristics, related product documentation, normal operating, installation and transport conditions, structural and performance requirements, and inspection rules, and describes the corresponding test methods.
This document is applicable to the manufacture of single-phase control transformers with AC 50 Hz (or 60 Hz), rated supply voltage up to 690 V, rated output voltage up to 690 V, and rated output capacity up to 3000 VA.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2900.1-2008, Electrotechnical terminology — Basic terms
GB/T 5169.10-2017, Fire hazard testing for electric and electronic products — Part 10: Glowing/hot-wire based test methods — Glow-wire apparatus and common test procedure
GB/T 5169.11-2017, Fire hazard testing for electric and electronic products — Part 11: Glowing/hot-wire based test methods — Glow-wire flammability test method for finished products
GB/T 5226.1-2019, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
GB/T 13384-2008, General specifications for packaging of mechanical and electrical products
GB/T 14048.1-2023, Low-voltage switchgear and controlgear — Part 1: General rules
3 Terms and definitions, symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.1-2008 and GB/T 14048.1-2023, as well as the following, apply.
3.1.1
machine tool control transformer
A transformer suitable for use in the electrical systems of machine tools and other mechanical equipment, serving as a power source for control circuits, lighting circuits, signal circuits and electronic equipment, and having two or more electrically isolated windings.
3.1.2
rated supply voltage
The nominal voltage applied to the transformer input terminals under normal operating conditions.
3.1.3
rated output voltage
The nominal value of the transformer output voltage under normal operating conditions.
3.1.4
rated output capacity
The rated output capacity is equal to the product of the rated output voltage and the rated output current of the transformer. When the transformer has multiple independent output windings, the rated output capacity is the sum of the products of the rated voltage and the rated current of each output winding.
3.1.5
no-load output voltage
The output voltage at no-load under rated supply voltage and rated frequency.
3.1.6
load output voltage
The output voltage at rated supply voltage and rated frequency when delivering the rated output power.
3.1.7
output voltage under instantaneous power conditions
The output voltage at rated supply voltage and rated frequency when delivering the instantaneous power.
3.2 Symbols
The main symbols defined in this document are as follows:
Uₑ — Rated supply voltage;
UH — Rated output voltage;
Ui — Rated insulation voltage;
Uk — No-load output voltage;
Um — Load output voltage;
Umφ — Output voltage under instantaneous power conditions.
4 Classification
4.1 By construction
Classified into shell-type and core-type.
4.2 By mounting type
Classified into vertical and horizontal mounting.
5 Characteristics
5.1 Construction type
Machine tool control transformers (hereinafter referred to as "transformers") are generally of open construction, and may also be supplied with an enclosure if required.
5.2 Specifications and parameters
5.2.1 Specifications
Transformers are classified by rated output capacity as:
40 VA, (50 VA), 63 VA, 100 VA, (150 VA), 160 VA, 250 VA, (300 VA), 400 VA, (500 VA), 630 VA, (800 VA), 1000 VA, (1500 VA), 1600 VA, (2000 VA), 2500 VA, 3000 VA.
Note: The number series without parentheses are preferred.
5.2.2 Parameters
5.2.2.1 Basic parameters
The basic parameters of transformers shall comply with Table 1 or be determined according to user requirements.
5.2.2.2 Rated frequency
The rated frequency of transformers is 50 Hz (or 60 Hz).
5.2.2.3 Rated insulation voltage
The rated insulation voltage of transformers is:
60 V, 100 V, 160 V, 250 V, 320 V, 500 V, 690 V.
5.2.2.4 Rated duty
Transformers are suitable for continuous duty at rated load.
5.3 Overall dimensions and mounting dimensions
The overall dimensions and mounting dimensions of transformers shall comply with the requirements of the specific product standards.
6 Related product documentation
