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DL/T 2008-2019 English PDF

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DL/T 2008-2019: (Field test method for power transformer, closed combination electric appliance and power cable composite connection)
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Basic data

Standard ID DL/T 2008-2019 (DL/T2008-2019)
Description (Translated English) (Field test method for power transformer, closed combination electric appliance and power cable composite connection)
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard K41
Word Count Estimation 20,245
Date of Issue 2019-06-04
Date of Implementation 2019-10-01
Regulation (derived from) Natural Resources Department Announcement No. 7 of 2019
Issuing agency(ies) National Energy Administration

DL/T 2008-2019: (Field test method for power transformer, closed combination electric appliance and power cable composite connection)


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
The field testing procedure for complex combination of power transformer, GIS and power cable ICS 29.180 K 41 Record number. 63143-2018 People's Republic of China Electric Power Industry Standard Power transformers, enclosed combined electrical appliances, Field test method of power cable composite connection 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration

Table of contents

Preface... II 1 Scope... 1 2 Normative Reference Documents... 1 3 Terms and Definitions... 1 4 General Provisions... 2 5 Test items... 2 6 Test methods and requirements... 3 7 Test Criterion... 5 8 Test report... 6 Appendix A (informative appendix) Test wiring when measuring the insulation characteristics of the composite connection side of the transformer... 7 Appendix B (informative appendix) Examples of test reports for composite connection of transformers, combined electrical appliances, and cables... 9 Appendix C (informative appendix) AC withstand voltage test for composite connections of transformers, combined electrical appliances, and cables... 11

Foreword

This standard is compiled in accordance with the rules of GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Compilation". This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the Power Transformer Standardization Technical Committee (DL/T C 02) of the power industry. Drafting organizations of this standard. State Grid Liaoning Electric Power Co., Ltd. Electric Power Research Institute, State Grid Liaoning Electric Power Co., Ltd., China Electric Power Research Institute Co., Ltd., State Grid Chongqing Electric Power Company, State Grid Gansu Electric Power Company Electric Power Research Institute Research Institute, State Grid Chongqing Electric Power Research Institute, State Grid Hebei Electric Power Co., Ltd. Electric Power Research Institute, Jilin Electric Power Co., Ltd. Electric Power Research Institute, State Grid Henan Electric Power Company, China Southern Power Grid Research Institute Co., Ltd. Ren company, Guangzhou Power Supply Bureau Electric Power Test Research Institute, Xi’an Xidian Transformer Co., Ltd., Datang Shandong Electric Power Company Limited. The main drafters of this standard. Yu Zaiming, Han Honggang, Lu Xuchen, Bi Haitao, Zhou Zhiqiang, Zhang Shuzhen, Feng Yu, Yin Hua, Fan Diming, Long Yingkai, Chen Zhiyong, Li Meng, Wang Nan, Li Xuebin, Zhang Jianzhuang, Peng Zaixing, Huang Yanguang, Hao Yi, Liu Yongjie. This standard is issued for the first time. The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of the China Electricity Council (Beijing No. 1, Er Tiao, Baiguang Road, Xuanwu District, 100761). Composite connection of power transformers, enclosed combined electrical appliances, and power cables Field test method

1 Scope

This standard specifies power transformers, enclosed combined electrical appliances, power cables (hereinafter referred to as transformers, combined Terms and definitions, test items, test methods and requirements, test report compilation for field test of composite connection (electrical appliances, cables) Write etc. This standard is applicable to the field test after the composite connection of transformers, combined electrical appliances and cables with voltage levels of 35kV~750kV. Test.

2 Normative references

The following documents are indispensable for the application of this standard. For dated reference documents, only the dated version is suitable Used in this standard. For undated reference documents, the latest version (including all amendments) is applicable to this standard. GB/T 2900.10-2013 Electrical terminology cable GB/T 2900.20-1994 Electrical terminology high-voltage switchgear GB/T 2900.95-2015 Electrotechnical terminology transformers, voltage regulators and reactors GB/T 5832.1 Determination of trace moisture in gas Part 1.Electrolysis method GB/T 5832.2 Determination of trace moisture in gas Part 2.Dew point method GB/T 8905 Guidelines for Gas Management and Detection in Electrical Equipment of Sulfur Hexafluoride GB 50150 Electrical equipment installation engineering electrical equipment handover test standard DL/T 474.4 Implementation guidelines for on-site insulation test AC withstand voltage test DL/T 506 Insulating gas humidity measurement method in sulphur hexafluoride electrical equipment DL/T 911 Frequency Response Analysis Method of Power Transformer Winding Deformation DL/T 1205 Test method for decomposition products of sulfur hexafluoride electrical equipment DL/T 1093 The guideline for detecting and judging power transformer winding deformation by reactance method DL/T 5293 Unified format of electrical equipment handover test report for electrical installation engineering JB/T 501 Power Transformer Test Guide

3 Terms and definitions

The following terms and definitions established in GB/T 2900.20, GB/T 2900.95 and GB/T 2900.10 apply to this standard quasi. 3.1 Power transformer A static power converter that transfers power without changing the frequency of its AC power source. [GB/T 2900.95-2015, terms and definitions 3.1.1] 3.2 Combination electrical gas insulated metal-enclosed switchgear (GIS) At least part of the metal-enclosed switchgear that uses gas above atmospheric pressure as the insulating medium. [GB/T 2900.20-1994, terms and definitions 3.12] 3.3 Insulated cable An assembly consisting of. --One or more insulated cores; --Respective coating (if any); --Cable core protective layer (if any); -Outer protective layer (if any); There can be additional non-insulated conductors in the cable; [GB/T 2900.10-2013, terms and definitions 2.2.1] 3.4 Complex combination of transformer, GIS and cable (CC-TGC) Transformers, combined electrical appliances and cables adopt oil and gas bushings, gas and gas bushings, oil and oil bushings, plug-in cable terminals, etc. Realize the combination form of transformer and combined electrical appliance connection, combined electrical appliance and cable connection, transformer and cable connection.

4 General

4.1 This standard specifies the test items and test methods that should be carried out after the handover and operation of CC-TGC. The assessment of the installation quality of the composite connection parts and the assessment of whether the CC-TGC meets the operating conditions after it is put into operation. 4.2 During the handover test, the initial value is the factory test data; when the routine test or preventive test is put into operation, the initial value is After CC-TGC is connected, test data will be transferred.

5 Test items

5.1 Before putting into operation The on-site handover test items that should be carried out before the transformer, combined electrical appliances, and cables are put into operation after composite connection are as follows. a) The air chamber tightness test of the composite connection part of the combined electrical appliance, transformer and cable; b) Water content measurement of SF6 gas in the gas chamber at the composite connection part of the combined electrical appliance, transformer and cable; c) Measurement of decomposition products in the air chamber at the composite connection part of the combined electrical appliance, transformer and cable; d) DC resistance measurement of the winding and bushing on the composite connection side of the transformer; e) Measurement of insulation resistance, absorption ratio or polarization index of the winding and bushing on the composite connection side of the transformer; f) Measurement of the dielectric loss factor tanδ of the winding on the composite connection side of the transformer and the bushing; g) AC withstand voltage test of the connecting parts of transformers and combined electrical appliances; h) AC withstand voltage test of the connection part of the combined electrical appliance and cable; i) AC withstand voltage test of transformer and cable connection parts; j) Deformation test of the winding on the composite connection side of the transformer. 5.2 After putting into operation After the combined connection of transformers, combined electrical appliances, and cables are put into operation, the on-site routine test items include. a) The air chamber tightness test of the composite connection part of the combined electrical appliance, transformer and cable; b) Water content measurement of SF6 gas in the gas chamber at the composite connection part of the combined electrical appliance, transformer and cable; c) Measurement of decomposition products in the air chamber at the composite connection part of the combined electrical appliance, transformer and cable; d) DC resistance measurement of the winding and bushing on the composite connection side of the transformer; e) Measurement of insulation resistance, absorption ratio or polarization index of the winding and bushing on the composite connection side of the transformer; f) Measurement of the dielectric loss factor tanδ of the winding on the composite connection side of the transformer and the bushing;

6 Test methods and requirements

6.1 Test method 6.1.1 Test method for air chamber tightness of composite connection parts of combined electrical appliances, transformers and cables The test method should meet the requirements of GB 50150. 6.1.2 Test method for measuring the moisture content of SF6 gas in the gas chamber of the composite connection part of the combined electrical appliance, transformer and cable The test method should meet the requirements of GB/T 5832 and DL/T 506. 6.1.3 Measurement and test method for the decomposition of the gas chamber at the composite connection part of the combined electrical appliance, transformer and cable The test method should comply with DL/T 1205. 6.1.4 Test method for measuring the DC resistance of the winding and bushing on the composite side of the transformer The test method should comply with the regulations of JB/T 501. 6.1.5 The test method for measuring the insulation resistance, absorption ratio or polarization index of the winding and bushing on the composite connection side of the transformer The test method should comply with the regulations of JB/T 501. 6.1.6 The test method for measuring the dielectric loss factor tanδ of the winding on the composite connection side of the transformer and the bushing The test method should comply with the regulations of JB/T 501. 6.1.7 Test method for AC withstand voltage test at the connection part of transformer and combined electric appliance The test method should comply with the regulations of JB/T 501. 6.1.8 The AC withstand voltage test method for the connection part of the combined electrical appliance and cable The test method should comply with DL/T 474.4. 6.1.9 AC withstand voltage test method for transformer and cable connection parts The test method should comply with the regulations of JB/T 501. 6.1.10 Deformation test method of the winding on the composite connection side of the transformer The test method should comply with DL/T 911 and DL/T 1093 regulations. 6.2 Test requirements 6.2.1 Requirements for air chamber tightness test at the composite connection part of combined electrical appliances, transformers and cables a) Use a leak detector with a sensitivity not less than 1×10-6 (volume ratio) to check the sealing parts and pipe joints after the composite connection Wait for testing; b) When necessary, local bandaging method can be used for gas leakage measurement; c) The measurement of the leakage value should be carried out 24 hours after the air chamber is inflated. 6.2.2 Test requirements for water content measurement of SF6 gas in the gas chamber at the composite connection part of the combined electrical appliance, transformer and cable The water content of SF6 gas should be measured 24 hours after the gas chamber at the composite connection is inflated. 6.2.3 Test requirements for the measurement of SF6 gas decomposition products in the gas chamber at the composite connection part of the combined electrical appliance, transformer and cable The test requirements should comply with DL/T 1205. 6.2.4 Test requirements for DC resistance measurement of the winding and bushing on the composite connection side of the transformer a) Measurements should be made at all positions of each tap; b) It should be measured at the grounding switch near the combined electrical appliance and the transformer; the test position and test wiring during routine test Should be consistent with the handover test; 6.2.5 Test requirements for measuring insulation resistance, absorption ratio or polarization index of the windings on the composite connection side of the transformer and the bushing a) It should be measured at the neutral bushing of the transformer, or at the grounding switch between the combined electrical appliance and the transformer. In group When measuring at the grounding switch near the combiner and the transformer, see Appendix A.1 for test wiring; measure at the neutral bushing of the transformer When measuring, see Appendix A.2 for the test wiring; the test wiring of each test should be consistent. 6.2.6 Test requirements for the measurement of the dielectric loss factor tanδ of the windings on the composite connection side of the transformer and the bushing a) It should be measured at the grounding switch near the combined electrical appliance and the transformer, or at the neutral bushing of the transformer. In group When measuring at the grounding switch near the combiner and the transformer, see Appendix A.1 for test wiring; measure at the neutral bushing of the transformer When measuring, see Appendix A.2 for the test wiring; the test wiring of each test should be consistent. 6.2.7 AC withstand voltage test requirements for the composite connection parts of transformers and combined electrical appliances The test voltage is carried out according to the lowest AC withstand voltage test voltage value of the connected equipment, and the pressure time is according to the shortest AC with the connected equipment The pressure resistance time is carried out. See Appendix C.1 for pressurization method. 6.2.8 Requirements for AC withstand voltage test of composite connection parts of combined electrical appliances and cables The test voltage is carried out according to the lowest AC withstand voltage test voltage value of the connected equipment, and the pressure time is according to the shortest AC with the connected equipment The pressure resistance time is carried out. See Appendix C.2.for pressurization method. 6.2.9 AC withstand voltage test requirements for the composite connection part of the transformer and cable The test voltage is carried out according to the lowest AC withstand voltage test voltage value of the connected equipment, and the pressure time is according to the shortest AC with the connected equipment The pressure resistance time is carried out. See Appendix C.3 for pressurization method. 6.2.10 Deformation test requirements of the winding on the composite connection side of the transformer a) It should be carried out on the grounding switch near the combined electrical appliance and the transformer; b) Test methods such as frequency response method and low-voltage short-circuit impedance method can be used. c) Record the wiring method of each test and keep the consistency of the wiring method.

7 Test criteria

7.1 Test criteria for the air chamber tightness test at the composite connection part of the combined electrical appliance, transformer and cable a) When the leak detector is used for detection, the leak detector should not alarm; b) When the partial bandaging method is used for measurement, the test results should meet the relevant regulations of GB 8905. 7.2 Test criteria for measuring water content of SF6 gas in the gas chamber at the composite connection part of the combined electrical appliance, transformer and cable The water content of SF6 in the air chamber of the connection part shall meet the relevant regulations of GB 50150, DL/T 393 and DL/T 596. 7.3 Test criteria for measuring the decomposition products of the air chamber at the composite connection part of the combined electrical appliance, transformer and cable The content of decomposition products in the air chamber at the connection part is SO2≤1μL/L, H2S≤1μL/L. 7.4 Test criteria for measuring DC resistance of the winding and bushing on the composite connection side of the transformer a) For three-phase transformers with voltage levels of 1600kVA and below, the mutual difference between the test values of each phase should be less than 4% of the average value. The mutual difference between the test values should be less than 2% of the average value; for three-phase transformers above 1600kVA, the mutual difference between the test values of each phase should be less than the average 2% of the value, the difference between the test values between lines should be less than 1% of the average value; b) The initial value difference of the same phase does not exceed ±2%; c) When there is a significant difference compared with the actual measured value of the transformer at the same temperature, comprehensive analysis should be made. 7.5 Test criteria for measuring the insulation resistance, absorption ratio or polarization index of the transformer composite connection side winding and bushing a) There should be no significant drop in insulation resistance; b) The absorption ratio should not be significantly different from the initial value, and should not be less than 1.3 at room temperature; c) There should be no significant difference between the polarization index and the initial value, and should not be less than 1.5 at room temperature; d) When there is a significant difference between the factory-measured value of the transformer at the same temperature, a comprehensive analysis should be made. 7.6 Test criteria for the measurement of the dielectric loss factor tanδ of the transformer composite connection side winding and bushing a) The tanδ value of the tested winding should not be greater than 130% of the initial value; b) When there is a significant difference between the factory-measured value of the transformer at the same temperature, a comprehensive analysis should be made. 7.7 AC withstand voltage test criteria for the composite connection parts of transformers and combined electrical appliances The test results should meet the relevant regulations of GB 1094.3.If the test voltage does not drop suddenly, the test is qualified. 7.8 Criteria for AC withstand voltage test of composite connection parts of combined electrical appliances and cables The test results should meet the relevant regulations of DL/T 474.4.If the test voltage does not drop suddenly, the test is qualified. 7.9 AC withstand voltage test criterion for the composite connection of transformer and cable The test results should meet the relevant regulations of GB 1094.3.If the test voltage does not drop suddenly, the test is qualified. 7.10 Deformation test criterion of the winding on the composite connection side of the transformer The test results should meet the relevant regulations of DL/T 911 and DL/T 1093.

8 Test report

See Appendix B for the test report format.

Appendix A

(Informative appendix) Test wiring when measuring the insulation characteristics of the composite connection side of the transformer A.1 Test wiring when conducting transformer insulation characteristics measurement at the grounding switch adjacent to the combined electrical appliance and the transformer Before the measurement, disconnect the circuit breaker CB that connects the transformer and the combined appliance in the combined appliance, and disconnect the isolation switch DS1. The grounding knife switch ES1 is closed, and the short-circuit bar SJ between the conductive part of the knife switch and the grounding body is disconnected. The three-phase conductive parts of the ground knife switch ES1 and the neutral point of the winding under test are short-circuited with a wire. At the same time, for safety, the grounding switch ES2 Put it in the grounded state, the measurement is carried out at the short circuit of the three-phase conductive part of the grounding switch ES1 and the neutral point of the tested winding, not under test The winding is short-circuited to ground, and the test wiring is shown in Figure A.1. A.2 Test wiring when conducting transformer insulation characteristic measurement at the neutral bushing of the transformer Disconnect the circuit breaker CB, the isolating switch DS1 and the grounding switch ES1 between the transformer and the combined electrical appliance. The group is short-circuited and grounded. The measured winding terminal does not need to be short-circuited. The measurement is carried out at the neutral point of the winding The grounding switch ES2 is placed in the grounded state, and the test wiring is shown in Figure A.2. Figure A.2 Test wiring when conducting transformer insulation characteristics measurement at the neutral bushing of the transformer

Appendix B

(Informative appendix) Test report of composite connection of transformers, combined electrical appliances and cables B.1 Test report of composite connection of transformers, combined electrical appliances and cables Table B.1 gives examples of typical test reports (templates) for the composite connection of transformers, combined electrical appliances and cables. 4.The insulation resistance, absorption ratio or polarization index of the winding on the composite connection side of the transformer and the bushing 5.Dielectric loss factor of the transformer composite connection side winding and bushing 6.AC withstand voltage test of composite connection part 7.Deformation test of the winding on the composite connection side of the transformer

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