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GB/T 27743-2025: Inspection method for transformer of special equipment
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GB/T 27743: Evolution and historical versions
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Inspection method for transformer of special equipment
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GB/T 27743-2025
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| GB/T 27743-2011 | English | 299 |
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Inspection method for transformer of special equipment
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Basic data
| Standard ID | GB/T 27743-2025 (GB/T27743-2025) |
| Description (Translated English) | Inspection method for transformer of special equipment |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | K97 |
| Classification of International Standard | 29.100.01 |
| Word Count Estimation | 14,168 |
| Date of Issue | 2025-10-05 |
| Date of Implementation | 2026-05-01 |
| Older Standard (superseded by this standard) | GB/T 27743-2011 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 27743-2025: Inspection method for transformer of special equipment
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT27743-2025
ICS 29.100.01
CCSK97
National Standards of the People's Republic of China
Replaces GB/T 27743-2011
Transformer-specific equipment testing methods
Published on 2025-10-05
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document replaces GB/T 27743-2011 "Test Methods for Special Equipment of Transformers". Compared with GB/T 27743-2011, except for the structure...
Aside from adjustments and editorial changes, the main technical changes are as follows.
---The scope has been changed (see Chapter 1, Chapter 1 of the.2011 edition);
---Added requirements for "working conditions" (see Chapter 4);
---The requirements for "Safety Protection Testing" have been changed (see 5.2, 4.2 in the.2011 version);
---The requirements for the "Noise Detection" method have been changed (see 5.4, 4.4 in the.2011 edition);
---The requirements for the "Special Testing Method for Silicon Steel Sheet Cross-cutting Production Line" have been revised (see 6.1, 5.1 of the.2011 edition);
---The requirements for the "Special Testing Method for Silicon Steel Sheet Slitting Production Line" have been revised (see 6.2, 5.2 of the.2011 edition);
---The requirements for the "Specific Testing Method for Vertical Winding Machines" have been revised (see 6.3, 5.3 of the.2011 version);
---The requirement for a "dedicated testing method for horizontal winding machines" has been added (see 6.4);
---Added the requirement for a "dedicated testing method for foil coil winding machines" (see 6.5);
---The requirements for the "Special Test Methods for Pressure Swing Vacuum Drying Equipment and Gas Phase Drying Equipment" have been revised (see 6.6,.2011 edition).
5.4).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the China Electrical Equipment Industry Association.
This document was drafted by. China Energy Conservation and Environmental Protection Group Xi'an Qiyuan Electromechanical Equipment Co., Ltd., Zhongshan Kaisheng Vacuum Technology Co., Ltd., and Zhejiang Jiangshan.
Yuanguang Electric Co., Ltd., Beijing Institute of Electrical Engineering and Economics of Machinery Industry, Mingzhu Electric Co., Ltd., and China Quality Certification Center have
Limited Liability Company, Jiangsu CRRC Electric Co., Ltd., Changchun Sanding Transformer Co., Ltd., Anhui Jinma Electric Technology Co., Ltd., Chint Electric Co., Ltd.
Limited Liability Company, Yangzhou Delijia Power Transformer Co., Ltd., Fujian Hesheng Zhixin Intelligent Electric Co., Ltd., Jiangsu Hengyuan Transformer Co., Ltd.
Company, Shengli Oilfield Shengxing Transformer Co., Ltd., Jilin Zhicheng Electric Co., Ltd., Guangdong Kehua Electric Technology Co., Ltd., Guangdong Hua
Jing Technology Co., Ltd., Zhejiang Electric Transformer Co., Ltd., Shandong Dimit Electric Co., Ltd., Dalian Shiyou Electric Technology Co., Ltd.
Guangzhou Yibian Electrical Equipment Co., Ltd., Rongzhong Electric Co., Ltd., Zhongshan Tongwei Electric Co., Ltd., Huiwang Electric Co., Ltd.
Hunan Tianwei Electric Co., Ltd., Qingzhou Great Wall Power Transformer Co., Ltd., and Hebei Baoli Transmission and Transformation Equipment Manufacturing Co., Ltd.
Company, Jiangmen Saiwei Electric Technology Co., Ltd., and Jiangsu Guoxin Electric Technology Co., Ltd.
The main drafters of this document are. Geng Youhui, Xu Jianping, Mao Feng, Hou Yao, Cai Dingguo, Wang Fang, Meng Wei, Lu Yuji, Wang Baifeng, Wang Gang, and Zhang Weiguo.
Li Meng, Hong Chungeng, Yu Bin, Wang Xiaojuan, Ding Haiqing, Xia Ji, Qiu Guoxing, Zeng Bofan, Xiao Wei, Xiang Bingfu, Dong Xiaodong, Wang Shiyou, Zhang Junhai, Chen Shunping
Huang Bingqiang, Xu Feng, Hu Ling, Tian Shumin, Guo Yufan, Zhang Dasai, Wei Xiulai.
This document was first published in.2011 as GB/T 27743-2011, and this is the first revision.
Transformer-specific equipment testing methods
1.Scope
This document describes the operating conditions, general testing methods, and specialized testing methods for transformer-specific equipment.
This document applies to silicon steel sheet horizontal shearing production lines, silicon steel sheet longitudinal shearing production lines, vertical winding machines, and horizontal winding machines used in transformer-specific equipment.
Machines, foil coil winding machines, variable pressure vacuum drying equipment, and gas phase drying equipment.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 150.4 Pressure Vessels - Part 4.Manufacturing, Inspection and Acceptance
GB/T 2900.39 Electrical Engineering Terminology - Special Equipment for Motors and Transformers
GB/T 3785.1 Electroacoustic sound level meters – Part 1.Specifications
JB/T 3857 Horizontal Winding Machine - Special Equipment for Transformers
JB/T 9658 Transformer-Specific Equipment. Silicon Steel Sheet Slitting Production Line
JB/T 10918 Transformer-Specific Equipment. Silicon Steel Sheet Cross-Cutting Production Line
JB/T 11054 Transformer-Specific Equipment. Transformer-Method Vacuum Drying Equipment
JB/T 11056 Transformer-Specific Equipment. Vapor Phase Drying Equipment
JB/T 11146 Foil Coil Winding Machine - Special Equipment for Transformers
JB/T 11147 Vertical Winding Machine for Transformers
3.Terms and Definitions
GB/T 150.4, GB/T 2900.39, JB/T 3857, JB/T 9658, JB/T 10918, JB/T 11054, JB/T 11056,
The terms and definitions defined in JB/T 11146 and JB/T 11147 apply to this document.
4.Working conditions
The operating conditions of transformer-specific equipment include.
a) Altitude not exceeding 1000m;
b) Ambient temperature. -10℃ to 40℃;
c) The relative humidity of the air is within the range of 30% to 85% (when the temperature is 20℃±5℃);
d) Power supply voltage. 220V(AC)/380V(AC), and the fluctuation of the power supply voltage shall not exceed ±10% of the rated voltage.
5.General testing methods
5.1 Working condition testing
Before the no-load operation performance test, the equipment's operating environment and voltage fluctuations should be tested. Testing tools include a thermometer, hygrometer, and voltage meter.
Tables, etc.
5.2 Safety Protection Testing
5.2.1 Insulation Resistance Measurement. An insulation resistance meter with a voltage of 500V or higher shall be used to measure the insulation resistance between the live circuit of the electrical control device and the grounding device.
Before taking measurements, disconnect the low-voltage control circuit.
5.2.2 Grounding Resistance Measurement. A grounding resistance tester is used to measure the grounding resistance at the main grounding terminal of the electrical control device and at any metal component housing electrical equipment.
Measurements were taken between intervals.
5.2.3 Safety protection devices with protective switches shall undergo operation tests no less than three times.
5.2.4 After the equipment is powered on, check that its operation meets the functional requirements of the equipment.
5.2.5 Testing of other items shall comply with the relevant product regulations.
5.3 Appearance quality inspection
5.3.1 Visually inspect the installation and arrangement of pipes and lines for oil, water, gas, electricity, etc.
5.3.2 Measure the misalignment of the mating surfaces using conventional measuring tools.
5.3.3 Visually inspect the surface quality of the equipment.
5.4 Noise Detection
Noise detection was conducted under normal equipment operating conditions, and the distance between the noise source and walls or other surrounding obstacles that could reflect noise was greater than [a certain value].
2m, measured using a Class 2 sound level meter as specified in GB/T 3785.1.Measurement points are arranged around the perimeter of the equipment, taking measurements from the front, back, and sides of the equipment.
Four standard measurement points were established on the surface. The measurement points were located at a height of (1.55±0.075) m above the ground and at a horizontal distance of 1 m from the perimeter of the equipment.
6.Specialized testing methods
6.1 Specific Testing Methods for Silicon Steel Sheet Cross-Shearing Production Line
6.1.1 No-load operation performance test
After the equipment is assembled, conduct no-load operation performance tests on each individual unit for no less than 2 hours. The main unit should be operated gradually from low speed.
Run the equipment at its highest speed for at least 1 hour, checking its operational flexibility and stability. The method for detecting equipment noise should be as follows.
5.4.After the initial test is passed, a full-machine linkage no-load operation performance test shall be conducted for no less than 2 hours to check whether the equipment's procedures and actions meet the requirements.
It meets the requirements for use.
6.1.2 Load Operation Performance Test
After the no-load operation performance test is passed, the load operation performance test is carried out to detect the product performance parameters. The shearing accuracy test is carried out according to Table 1.
Table 1 Shearing accuracy test
Testing items, testing tools, testing methods
The shear length error of silicon steel sheet should be measured no less than three times using a measuring instrument, and the maximum difference should be recorded.
The angle error of the silicon steel sheet should be measured no less than three times using the angle error measuring instrument, and the maximum difference should be taken.
Measure at least three points using a micrometer or tool microscope, and take the maximum value.
6.1.3 Assembly quality inspection
6.1.3.1 The quality inspection of the uncoiler shall be carried out in accordance with Table 2.
Table 2 Quality Inspection of Uncoiling Machine
Testing items, testing tools, testing methods
The diameter of the drum is π, and the reading is taken directly after one revolution of the outer diameter.
Hydraulic cylinder oil leak - visual inspection
6.1.3.2 The quality inspection of the feeder shall be carried out in accordance with Table 3.
Table 3 Quality Inspection of Feeder
Testing items, testing tools, testing methods
Perpendicularity error between the feed roller and the reference side guide rail. right angle ruler, dial indicator
Use a right-angle ruler to align one side with the guide rail, and the other side with...
The dial indicator should be tested no less than three times, and the maximum value should be recorded.
The parallelism error between the measuring roller and the feed roller should be checked with a dial indicator at least three times, and the maximum difference should be recorded.
6.1.3.3 The quality inspection of the punching section shall be carried out according to Table 4.
Table 4 Quality Inspection of Punch Press Section
Testing items, testing tools, testing methods
The two linear guides of the punch press slide are parallel to the horizontal plane.
Parallelism error
Use a dial indicator to measure the maximum difference.
The two linear guides of the punch press slide are connected to the reference side.
verticality error
Right angle ruler, dial indicator
Use a right-angle ruler to align one side with the guide rail, and a dial indicator to align the other side.
Test at least three times and take the maximum value.
The height difference between the lower cutting face of the punch press and the lower cutting face of the shearing machine is measured with a height gauge, and the maximum difference is recorded.
When shearing burrs on silicon steel sheets, measure at least three points using a micrometer or tool microscope, and take the maximum value.
The gap between the upper and lower cutters of the punch press is measured using a feeler gauge along its entire length, and the maximum value is recorded.
6.1.3.4 The quality inspection of the shearing section shall be carried out according to Table 5.
Table 5 Quality Inspection of Shear Section
Testing items, testing tools, testing methods
Equal height error between the shearing machine's lower blade face and the punching machine's lower blade face
The height of the upper generatrix of the lower roller and the lower blade face of the shear.
Height error
The height of each movable side guide rail and the reference on the fixed side
Side rail height error
Use a height gauge to measure and take the maximum difference.
The parallelism error between each width-adjusting lead screw and the punch press slide guide rail is measured with a dial indicator, and the maximum difference is recorded.
The gap between the upper and lower blades of the shearing machine was measured using a feeler gauge along its entire length, and the maximum value was recorded.
6.1.3.5 Hydraulic system testing shall be performed according to Table 6.
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