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Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. DL/T 2001-2019: Guide for converter transformer on-site no-load test, load test and temperature rise test Status: Valid
Basic dataStandard ID: DL/T 2001-2019 (DL/T2001-2019)Description (Translated English): Guide for converter transformer on-site no-load test, load test and temperature rise test Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: K41 Classification of International Standard: 29.180 Word Count Estimation: 21,212 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 Summary: This standard specifies the method, test equipment, and test result judgment basis for on-site no-load, load and temperature rise tests of oil-immersed converter transformers for HVDC transmission. This standard is applicable to on-site no-load, load and temperature rise tests of single-phase two-winding converter transformers for high-voltage direct current transmission with voltage levels of ��800 kV and below. Single-phase three-winding converter transformers and ��1100 kV converter transformers can be implemented by reference. DL/T 2001-2019: Guide for converter transformer on-site no-load test, load test and temperature rise test---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. Guide for converter transformer on-site no-load test, load test and temperature rise test ICS 29.180 K 41 Record number. 63143-2018 People's Republic of China Electric Power Industry Standard No-load on-site converter transformer, Load and temperature rise test guide 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration Table of contentsForeword...II 1 Scope...1 2 Normative references...1 3 Terms and definitions...2 4 Symbols and names...2 5 General...2 6 No-load test...3 7 Load test...6 8 Temperature rise test...8 Appendix A (informative appendix) Judgment of residual magnetism and demagnetization method...10 Appendix B (informative appendix) Selection of high voltage filter compensation device for no-load test...11 Appendix C (informative appendix) Typical design of compensation capacitor tower for field load test...13 Appendix D (informative appendix) Basic format of no-load, load and temperature rise test report of converter transformer...14ForewordThis standard is compiled in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation". This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the National High Voltage Test Standardization Sub-Technical Committee (DL/T C 02). Drafting organizations of this standard. State Grid Hubei Electric Power Research Institute, China Electric Power Research Institute Co., Ltd., State Grid Henan Electric Power Company Electric Power Research Institute, Electric Power Industry Electrical Equipment Quality Inspection and Testing Center, China Southern Power Grid EHV Transmission Company, State Grid Shaanxi Electric Power Company Electric Power Research Institute, China Southern Power Grid Research Institute Co., Ltd., ABB Chongqing Transformer Co., Ltd., TBEA Xinjiang Transformer Factory, Baoding Tianwei Baobian Electric Co., Ltd., Xi'an Xidian Transformer Co., Ltd., Datang Hunchun Power Plant, Suzhou Huadian Electric Co., Ltd. The main drafters of this standard. Zhou Kai, Wang Tao, Guo Huihao, Zhang Shuzhen, Wang Wei, Wang Qi, Wu Heng, Li Xiaoxia, Lei Yuan Yuan, Zheng Hanbo, Wu Qiuping, Yao Hongyang, Dong Yanchao, Shen Hong, Qu Guanghui, Liu Xiaozhuang. The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing) One, 100761). Guidelines for on-site no-load, load and temperature rise tests of converter transformers1 ScopeThis standard specifies that oil-immersed converter transformers (hereinafter referred to as converter transformers) for high-voltage direct current transmission shall be used for on-site no-load, load and temperature rise tests Test methods, test equipment, and test results judgment basis. This standard is applicable to the on-site no-load, load and temperature rise tests of single-phase two-winding converter transformers for high voltage DC transmission with voltage levels of ±800kV and below Test. Single-phase three-winding commutation transformer and ±1100kV commutation transformer can be implemented by reference.2 Normative referencesThe following documents are indispensable for the application of this standard. For dated reference documents, only the dated version applies to this standard quasi. For undated reference documents, the latest version (including all amendments) is applicable to this standard. GB 1094.1-2013 Power Transformer Part 1.General Rules GB 1094.2-2013 Power Transformer Part 2.Temperature Rise of Liquid-immersed Transformer GB 1094.3 Power Transformer Part 3.Insulation level, insulation test and external insulation air gap GB/T 2900.95-2015 Electrotechnical terminology transformers, voltage regulators and reactors GB/T 7252 Guidelines for Analysis and Judgment of Dissolved Gases in Transformer Oil GB/T 16927.1 High Voltage Test Technology Part 1.General Definition and Test Requirements GB/T 16927.3 High Voltage Test Technology Part 3.Definition and Requirements of Field Test GB/T 18494.2-2007 Converter Transformer Part 2.Converter Transformer for HVDC Transmission JB/T 501-2006 Test Guidelines for Power Transformers3 Terms and definitionsThe following terms and definitions defined in GB/T 2900.95-2015, GB 1094.1-2013 and GB 1094.2-2013 apply to this standard quasi. For ease of use, some terms and definitions are repeated below. 3.1 No-load loss When the rated voltage (tap voltage) at the rated frequency is applied to the terminals of one winding and the other windings are open, the active power absorbed power. [GB 1094.1-2013, definition 3.6.1] 3.2 No-load current When the rated voltage (tap voltage) at the rated frequency is applied to the terminal of one winding, when the other windings are open, it flows through the winding wire The root mean square value of the current at the circuit terminal. [GB 1094.1-2013, definition 3.6.2] 3.3 Load loss In a pair of windings, when the rated current (tap current) flows through the line terminals of one winding and the other winding is short-circuited, the At this time, the other windings (if any) should be opened. [GB 1094.1-2013, definition 3.6.3] 3.4 Total loss The sum of no-load loss and load loss. [GB 1094.1-2013, definition 3.6.4] 3.5 Short circuit impedance At rated frequency and reference temperature, the equivalent series impedance between a winding terminal in a pair of windings determines this When the value is set, the terminal of the other winding is short-circuited, and the other winding (if any) is open. [GB 1094.1-2013, definition 3.7.1] 3.6 Temperature rise The difference between the temperature of the component (location) under consideration (for example. the average temperature of the winding) and the temperature of the external cooling medium. [GB 1094.2-2013, definition 3.3]4 Symbols and namesThe symbols and names of various variables in this standard are as follows. I1 ---- Rated current (A); f1 ---- Rated frequency, namely the fundamental frequency (Hz); U ---- RMS voltmeter reading during no-load test (kV); U'---- Average voltmeter reading during no-load test (kV); d ---- Waveform correction factor; S ---- Regulating power supply capacity (kW); I0 ---- No-load current of the converter transformer (%); Sn ---- The rated capacity of the converter transformer (kVA). IX ---- Load loss test current under frequency fX (A); ILN ---- The root mean square value of the load current when the winding under consideration is running (A); Ih ----h harmonic current (A); Ieq ---- The root mean square value of the load current sine current equivalent to the load loss of the winding in operation (A); h ---- harmonic order; Ur ---- Rated phase voltage on the side of converter transformer valve (kV); P1 ---- Total load loss under fundamental frequency (kW); PWE1 ---- Winding eddy current loss at fundamental frequency (kW); PSE1 ---- The stray loss (kW) of structural parts (excluding windings) at the fundamental frequency; PN ---- total operating load loss (kW); fh ---- frequency of h harmonic (Hz); FWE ---- additional coefficient of eddy current loss in winding; FSE ---- additional coefficient of stray loss of structural parts; kh ---- The ratio of current Ih to rated current I1; R ---- winding DC resistance (Ω) including internal lead; Pkt ---- load loss under rated current (kW); Ukt ---- short-circuit voltage at rated current (kV); Pkt' ---- reduce the load loss measured under current (kW); Ukt' ---- Reduce the short-circuit voltage (kV) measured under current;5 General5.1 Test purpose The purpose of conducting no-load test, load test or temperature rise test on the converter transformer site is as follows. a) By measuring the no-load loss and no-load current under the rated voltage, verify whether these two indicators are in accordance with the national standard or product technical agreement. Check and diagnose the defects in the commutator transformer magnetic circuit within the allowable range of the discussion. b) By measuring short-circuit impedance and load loss, verify whether these two indicators are in the national standard or product technical agreement, and at the same time In order to find the defects of the winding and magnetic leakage circuit structure through the experiment. c) The commutation variable temperature rise test is to determine the top oil temperature rise and the average temperature rise of the windings to verify the maximum Whether the total loss and the equilibrium temperature of the cooling device meet the requirements of relevant standards. 5.2 Necessity In the following situations, no-load test, load test or temperature rise test shall be carried out on site. a) The converter transformer assembled on site (the temperature rise test can be carried out if conditions permit). b) Converter transformer repaired on site (such as replacing or repairing the core and suspecting that the transformer magnetic circuit is defective, the no-load test can be carried out; replacement Or to repair windings and to carry out a load test when there is a suspected defect in the magnetic leakage circuit; when it is suspected to have an overheating defect in the converter transformer, it can be carried out Temperature rise test). c) When necessary. 6 No-load test 6.1 Test method 6.1.1 No-load test requirements for converter transformer and test site Before the no-load test, the converter transformer and the test site shall meet the following requirements. a) The oil temperature of the converter transformer should be 5℃~40℃. b) Conventional tests such as conversion ratio and polarity measurement, DC resistance measurement, insulation characteristic measurement, insulating oil test, etc. before no-load test qualified. c) The converter transformer tank, iron core, clamps and surrounding conductors should be reliably grounded. d) After the oil has been fully allowed to stand, the standing time shall be as required by the manufacturer. When the manufacturer has no regulations, the ±800kV voltage converter transformer must be static The converter transformer with voltage level below ±800kV must be allowed to stand for more than 72h if it is set for more than 96h. e) Demagnetization should be performed before the test to eliminate the influence of residual magnetism on the no-load test. Note. Refer to Appendix A for the demagnetization method and judgment method of core remanence. 6.1.2 Test wiring The schematic diagram of the no-load test wiring of the converter transformer is shown in Figure 1.The pressure side of the tested converter transformer should be the valve side, and the on-site no-load test has symmetrical pressure And asymmetric pressure. The commutation transformer whose valve side winding is D connection mode should adopt symmetrical pressurization mode, as shown in Figure 1a); Converter transformers with Y-connection windings should adopt asymmetrical pressurization, as shown in Figure 1b). a) Symmetrical pressure connection b) Asymmetrical pressure connection 6.1.3 Voltage applied for no-load test The voltage applied in the no-load test shall meet the following requirements. a) When the no-load test is carried out according to the factory test standard, it should be 0.5Ur, 0.6Ur, 0.7Ur, 0.8Ur, 0.9Ur, 0.95Ur, 1.0Ur, Measure no-load current and no-load loss at voltages of 1.05Ur, 1.1Ur and 1.15Ur. The actual applied voltage and the specified measurement point can be There is a deviation, but the deviation should not exceed 1%. Note. For the converter transformer repaired on site, the no-load test voltage and pressurization procedure should be determined by the manufacturer through consultation with the user. b) When measuring the no-load loss under rated voltage, ensure that the total harmonic content of the voltage waveform THDu is not more than 5%. If THDu is greater than 5%, the validity of the test should be confirmed in accordance with the agreement. c) In the no-load test, a RMS voltmeter should be used in parallel with the average voltmeter. The test voltage is subject to the average voltmeter reading (The scale of the voltmeter has the root mean square value of the sine wave with the same average value). d) If the absolute value of the waveform correction factor d is within 3%, the test voltage waveform meets the requirements. If the absolute value of d is greater than 3%, The validity of the test data should be confirmed in accordance with the agreement. e) The test frequency should be 50 ± 0.5 Hz. f) No-load loss P0 should be corrected according to formula (1). 6.2 Test equipment 6.2.1 Regulated power supply The regulated power supply should meet the following requirements. a) The voltage regulating power supply should have the ability to work stably for a long time. b) High-power variable-frequency voltage-regulating power supply should be adopted as the voltage-regulating power supply for no-load test on site. c) When using high-voltage and high-power variable-frequency voltage-regulating power supply as the voltage-regulating power supply for no-load test, it is advisable to connect a Γ-type filter to the output end of the power supply Device. d) The output frequency should cover 50Hz. e) The capacity of the voltage regulating power supply should be large enough, and the power supply impedance should be small enough to ensure that the total harmonic content of the no-load current is not more than 100% When the power supply output voltage waveform total distortion rate does not exceed 5%. The capacity of the voltage regulating power supply should not be less than 10% of the no-load capacity of the converter transformer Times, can be calculated by formula (2). 6.2.2 Test transformer The test transformer shall meet the following requirements. a) The capacity of the test transformer should match the capacity of the regulating power supply. The low-voltage side voltage should match the rated output voltage of the regulating power supply. The side should match the voltage of the valve side winding of the converter transformer. b) The parameters of each model of the two test transformers used for the no-load test of the D-connected converter transformer symmetrical pressurized connection method should be consistent, any of which One should be able to be used for no-load test of Y-connected converter transformer. The voltage on the high-voltage side of the test transformer should be 1.2Ur. c) The rated output current of the high-voltage side of the test transformer should not be less than the no-load current under the 1.15Ur voltage of the tested converter transformer. d) The short-circuit impedance of the test transformer should not be greater than 5%. 6.2.3 Filter compensation device The equipment selection and use of the filter compensation device should meet the following requirements. a) When the harmonic content of no-load current exceeds 100%, and the capacity of the voltage regulating power supply or step-up transformer is limited, the voltage waveform correction cannot be guaranteed. If the correction factor is within ±3%, a filter compensation device should be considered. b) The filter compensation device is a passive filter composed of a fixed capacitor and an adjustable inductance in series, and its resonance frequency is 3 times, 5 times, etc. For odd harmonic frequencies, 3 and 5 filters should be used at the same time. If necessary, odd harmonic filters of 7 and above can be considered. The connection method with the test circuit is shown in Figure 1. c) When installing a harmonic filter, monitor the current on the low-voltage side or high-voltage side of the step-up transformer. Additional current transformer and measurement The accuracy and frequency range of the instrument shall meet the requirements of 6.2.4. d) The capacitance and inductance rated voltage, rated current, operating frequency, inductance adjustment range and other parameters in the filter compensation device can be selected Refer to Appendix B. 6.2.4 Transformers and meters for measurement Measuring transformers and meters should meet the following requirements. a) No-load test should use current and voltage transformers of not less than 0.02. b) The power analyzer should be used for measurement. c) The accuracy of power analyzers and other instruments used in the no-load test shall not be lower than 0.1 level. Power measurement should use power factor not greater than 0.01 Low power factor power meter. d) The measuring instrument should be within the calibration period. 6.3 Judgment basis for no-load test results The results of the no-load test are determined based on the following. a) The no-load loss value and no-load current meet the contract requirements, otherwise the manufacturer and the user should negotiate and resolve. b) A chromatographic analysis of dissolved gas in oil should be performed before and after the no-load test. The chromatographic analysis results meet the requirements of GB/T 7252. There is no obvious change before and after the test. Note. For the converter transformer repaired on site, the no-load loss value is determined by the manufacturer and the user through negotiation.7 Load test7.1 Test method 7.1.1 Requirements of load test on converter transformer and test site Before the load test, the converter transformer and the test site shall meet the following requirements. a) The oil temperature of the converter transformer should be 5℃~40℃. b) Before the load test, the conversion ratio and polarity measurement, DC resistance measurement, insulation characteristic measurement, insulating oil test and other conventional tests qualified. c) The converter transformer tank, iron core and clamps should be reliably grounded. d) If the load test needs to be carried out for a long time, first check whether the cooling conditions of the converter transformer meet the test requirements. 7.1.2 Test wiring In the load test, current should be applied to the wire end of the grid-side winding of the converter transformer, and the valve-side winding should be short-circuited and grounded. On the high-voltage side of the test transformer, Reactive power compensation capacitors of appropriate capacity should be connected in parallel. The test wiring diagram is shown in Figure 2. 7.1.3 Matters needing attention In order to reduce the measurement error, the following items should be paid attention to in the load test. a) The test leads and short-circuit connecting wires should consider the wire diameter according to the rated conditions, and should not be too small. For copper wires, the current density is recommended 2A/mm2~3A/mm2. b) The two leads of the voltage transformer to measure voltage should be directly led out from the two wire ends of the grid-side winding with insulated wires, and should not be connected nearby Connect to the end of the reactive power compensation capacitor. c) The load loss measurement should be carried out on the main tap and the two limit taps respectively, and the short-circuit impedance should be tested. d) In order to avoid the heating of the windings causing obvious errors in the test results, the test and measurement should be carried out quickly; meanwhile, t...... |
