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DL/T 1999-2019 English PDF

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DL/T 1999-2019: (Field test method for DC partial discharge measurement of converter transformer)
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
DL/T 1999-2019	279	Add to Cart	3 days	(Field test method for DC partial discharge measurement of converter transformer)	Valid

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Basic data

Standard ID: DL/T 1999-2019 (DL/T1999-2019)
Description (Translated English): (Field test method for DC partial discharge measurement of converter transformer)
Sector / Industry: Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard: K41
Word Count Estimation: 12,131
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 1999-2019: (Field test method for DC partial discharge measurement of converter transformer)

---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.
Method of On-site DC Partial Discharge Test for Converter Transformer ICS 29.180 K 41 Record number. 63143-2018 People's Republic of China Electric Power Industry Standard DC partial discharge measurement of converter transformer 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration

Preface...2 1 Scope...3 2 Normative references...3 3 Terms and definitions...3 4 Test conditions...4 5 Test equipment and test instruments...4 6 Test wiring...5 7 Test voltage and test procedure...7 8 DC partial discharge measurement...8 9 Judgment of test results...8 10 Identification and suppression of common interference sources...8 Appendix A (informative appendix) The structure and dimensions of the equalizing ring of the valve side casing...10 Appendix B (informative appendix) Differential signal method to suppress spatial interference...12 Appendix C (informative appendix) Interference identification method for DC partial discharge measurement of converter transformer...13

Foreword

This standard is compiled for the first time. This 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 Shaanxi Electric Power Research Institute, State Grid Electric Power Research Institute Wuhan Nanrui Co., Ltd., State Grid Liaoning Electric Power Co., Ltd. Electric Power Research Institute, State Grid Gansu Electric Power Company Electric Power Research Institute, Power Industry Electrical Equipment Quality Inspection and Testing Center, Tsinghua University, TBEA Hengyang Transformer Co., Ltd., Baoding Tianwei Baobian Electric Co., Ltd., Changzhou Toshiba Transformer Co., Ltd., ABB Chongqing Transformer Co., Ltd., Guangzhou Siemens Transformer Co., Ltd., TBEA Co., Ltd., Xi'an Xidian Transformer Co., Ltd. Company, TBEA Shenyang Transformer Group Co., Ltd., Datang Huainan Luohe Power Plant. The main drafters of this standard. Xie Qijia, Wang Tao, Zhang Shuzhen, Liu Xiaowei, Cheng Lin, Ying Yong, Hu Chunjiang, Wang Xinsheng, Chen Jiang Bo, Zhao Linjie, Zhou Yuanxiang, Wu Zhiyuan, Liu Xuemin, Xu Huafeng, Wang Liejun, Lu Xiaodong, Li Wengang, Zhang Jian, Liu Feng, Wang Mizhu. 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). Field test method for DC partial discharge measurement of converter transformer

1 Scope

This standard specifies the test conditions, test methods, judgment of test results, and routine tests for DC partial discharge measurement of converter transformers. See identification and suppression of interference sources. This standard applies to on-site DC partial discharge measurement of single-phase converter transformers used in DC transmission projects with voltage levels of ±800kV and below. The ±1100kV converter transformer can be implemented by reference.

2 Normative references

The 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/T 2900.33-2004 Electrical Engineering Terminology Power Electronics Terminology GB/T 2900.95-2015 Electrotechnical terminology transformers, voltage regulators and reactors GB/T 7354 Partial discharge measurement GB/T 18494.2-2007 Converter Transformer Part 2.Converter Transformer for HVDC Transmission DL/T 274 ±800kV HVDC equipment handover test DL/T 377 HVDC equipment acceptance test DL/T 417 Partial discharge field measurement guidelines for power equipment DL/T 1243 On-site partial discharge test technology for converter transformers

3 Terms and definitions

The following terms and definitions as well as those defined in GB/T 2900.33-2004 and GB/T 2900.95-2015 and the following terms and definitions apply to this standard. 3.1 DC partial discharge Electrical discharge in which the insulation between conductors is only partially bridged under a DC electric field. 3.2 DC partial discharge measurements for converter transformer Apply the specified DC voltage to the valve side winding of the converter transformer and measure whether the partial discharge meets the specified requirements under the DC voltage test. Note. This definition is consistent with the DC withstand voltage test of the winding and bushing in DL/T 377, the DC withstand voltage test of the valve-side winding and bushing in DL/T 274, and DL/T 1243 The partial discharge test under DC voltage is consistent. 3.3 Valid pulses of partial discharge The partial discharge from the converter transformer in the DC partial discharge measurement of the converter transformer, and the apparent partial discharge is greater than the standard given threshold Value of partial discharge pulse. 3.4 Partial discharge detect device for DC voltage A digital partial discharge test instrument for continuous detection, recording and statistics of partial discharge under DC voltage. 3.5 Differential signal method The difference between the analog signals received by two different paths is connected to the partial discharge meter for detection.

4 Test conditions

4.1 Test environment The test environment conditions should meet. a) Ambient temperature. 0℃～40℃; b) Relative humidity. less than or equal to 80%; c) There is no significant dust, smoke, corrosive gas, steam, smoke pollutants or sand in the surrounding air; d) There is no significant interference pulse source around. 4.2 The tested converter transformer The tested converter transformer shall meet the following requirements before the test. a) The appearance of the equipment is good, and there is no obvious pollution or damage to the outer insulating surface; b) The equipment has completed other routine test items, and all the results are qualified; c) The converter transformer that has undergone hot oil circulation treatment should be allowed to stand still before the test, and should be fully exhausted in time during the standing period, and the exhaust should be no less than 2 times, keep the vacuum if necessary; when the ambient temperature is lower than 5℃, heat preservation measures should be taken to avoid the oil temperature dropping too fast during the standing period; d) Standing time requirements. 500kV and below grade equipment should be no less than 72h, 800kV (including 600kV) grade equipment should be no less than 96h, When the manufacturer provides otherwise, it shall be implemented according to the manufacturer's requirements; e) All bushing terminals, fuel tanks, iron cores and clamps shall be reliably grounded, and shall be grounded continuously for at least 2h before the start of the test; f) The body oil surface temperature should be in the range of 10℃～30℃ during the test.

5 Test equipment and test instruments

5.1 DC high voltage generator 5.1.1 Rated parameters The rated parameters of the DC high voltage generator should meet. a) The rated output current should not be less than 10mA; b) The rated output voltage should not be less than 120% of the DC partial discharge measurement test voltage of the converter transformer under test; c) Under the rated output voltage, the partial discharge of the DC high-voltage generator body should not exceed 800pC; d) Under the conditions of rated output voltage and rated output current, the allowable continuous working time should not be less than 150min. 5.1.2 Polarity, ripple factor and short-term stability of the output voltage waveform The waveform of the HVDC generator should meet. a) The output voltage polarity should be positive (or switchable polarity); b) The ripple factor should be less than 3%; c) The short-term stability within 5 minutes should not exceed 1%. 5.1.3 Main components The main components of the DC high voltage generator should meet. a) The charging power supply should be a push-pull variable frequency power supply (or other variable frequency power sources that do not generate high frequency pulses), and the frequency conversion range should be selected 30Hz～300Hz, and continuously adjustable. b) The body of the voltage doubler rectifier device and the high-voltage DC divider should be connected as a whole, and the body support tube should adopt an umbrella skirt structure; the total height of the device (Including the equalizing ring) should not exceed 20m; the device body should adopt a structure suitable for on-site rapid assembly and long-distance transportation. c) The equalizing ring should adopt a double-ring structure, and the designed surface field strength of the equalizing ring should not be greater than 13kV/cm under the rated voltage. d) The output of the main body should adopt blocking filter. 5.2 Test equipment 5.2.1 Voltage measuring device The total uncertainty of the test voltage value (arithmetic average) measured by the voltage measuring device should not be greater than 5%, and the total uncertainty of the ripple amplitude measurement should not be greater than 10%. 5.2.2 Current measuring device When a current measuring device is installed, the uncertainty of measuring current should not be greater than 0.5%. 5.2.3 DC partial discharge tester In addition to meeting the requirements of GB/T 7354, the DC partial discharge tester should also meet. a) There should be at least 2 independent channels; b) With the automatic statistics function of pulse partial discharge and pulse number; c) It has the function of continuous storage and playback of partial discharge signals, and the continuous storage time is not less than 150min.

6 Test wiring

6.1 Test the main circuit The two terminals of the tested valve side winding of the converter transformer are short-circuited and connected to the high-voltage output terminal of the high-voltage DC generator via the pressurized lead, and the other non-tested terminals The sub and converter transformer oil tank, iron core, clamps, etc. should all be reliably grounded. Taking a two-winding converter transformer as an example, the field test wiring of the DC partial discharge measurement of the converter transformer is shown in Figure 1.Grounding wire should be used Copper wire with transparent insulating sheath, and there should be only one connection point with the ground network. 6.2 Partial discharge measurement wiring The partial discharge detection impedance should be connected between the two bushing end screen terminals of the side winding of the tested valve and the ground, and the impedance should be grounded nearby. Figure 1 As shown; the connection line between the impedance and the final screen should be a shielded wire, and the shielding layer of the shielded wire should be grounded nearby. 6.3 Pressure equalizing ring for test The two bushings of the side winding of the tested valve shall be equipped with a pressure equalizing ring to prevent corona during the test..200kV, 250kV, 400kV, 500kV, Refer to Appendix A for the size parameters of the equalizing ring required for the DC partial discharge measurement of 600kV and 800kV converter transformers. Since the installation of the equalizing ring reduces the minimum distance between the high-voltage part and the grounding part, the maximum electric field strength on the surface of the equalizing ring may increase. Therefore, the electric field calculation and verification should be carried out when selecting the equalizing ring, and the calculated maximum surface field strength should not be greater than 13kV/cm. 6.4 Pressure leads The pressurized lead should be selected with a larger diameter according to the test voltage and the surface roughness of the lead. DC Partial Discharge Measurement of 500kV Converter Transformer Conductive telescopic hose with a diameter of not less than 500mm through cable can be used for field test. 800kV converter transformer DC partial discharge measurement field test can be Use conductive telescopic hose with a diameter of not less than 600mm, or a metal tube with a diameter of not less than 350mm with a smooth surface and no burrs. 6.5 Test circuit layout The layout of test products and test equipment should meet. a) The distance between all high-voltage parts in the test circuit and the grounding body or adjacent objects should not be less than the larger of the following two distances. 1) 1.5 times the minimum distance between the end of the winding on the valve side of the sample under test (not including the pressure equalizing ring for testing) and the grounding part of the sample 2) The distance obtained by dividing the test voltage Ud (unit. kV) of the sample by.200 (unit. kV/m). b) The angle between the pressure lead and the high-voltage DC generator (vertical direction) should not be less than 60°.

7 Test voltage and test procedure

7.1 Test voltage The test voltage should be a positive voltage. When performing handover test or diagnostic test on site, voltage cannot be pre-applied. The test voltage is factory 85% of the test voltage (or the value specified in the contract). 7.2 Test procedure The test procedure is shown in Figure 2, and the requirements are as follows. a) After the test power supply is switched on, the test voltage should be applied at a steady, uniform speed and continuously to the test voltage value. Apply a lower voltage. The boost time t1 should be no more than 1min. The output current change of the DC generator should be monitored during the boost process, In the event of a sudden increase or decrease in the current value, the test should be stopped immediately to find out the cause. b) After the voltage rises to the specified level, it is maintained and the partial discharge detection is performed at the same time. The continuous test time t2 is 90min. During the test, The voltage fluctuation should not exceed ±3% (arithmetic mean). When the test circuit equipment and the tested converter transformer have an external flashover, In the event of abnormalities such as discharge, abnormal noise, and sudden current changes, stop the test immediately to find out the cause. c) After the test is completed, the voltage should be reduced quickly. The depressurization time t3 should be no more than 1 min. Wait for the voltage measuring device to show close to "zero" It can be discharged and grounded. 7.3 Grounding after the test After the DC partial discharge measurement test of the converter transformer, sufficient discharge should be carried out to reduce the residual charge that may exist in the insulating structure Impact on the remaining tests. After the DC partial discharge measurement of the converter transformer, if the AC partial discharge measurement is performed, the grounding time should not be less than 12h.

8 DC partial discharge measurement

8.1 Calibration of apparent partial discharge To complete the test wiring, according to the method specified in GB/T 7354 and DL/T 417, inject a.2000pC square wave into the end of the winding sleeve on the valve side under test Perform calibration and verify its linearity at 1000pC. 8.2 Measurement and recording When the test power is turned on, the background noise level of the channel should be recorded. Under 50% test voltage, the detected pulse level should not be greater than 1000pC, otherwise measures should be taken to suppress interference pulses. During the continuous test time t2, the number of pulses and the Should be amplitude and polarity.

9 Judgment of test results

9.1 Eligibility criteria When the following conditions are all satisfied, the test result is considered to be passed. a) In the last 30 minutes of the test, the number of effective discharge pulses not less than.2000pC recorded should not exceed 30, and at the end Within 10min, the number of effective discharge pulses not less than.2000pC should not exceed 10.If this condition is not met, you can try The test was extended by 30 minutes. b) The test with an extension of 30 minutes is allowed to be carried out only once. Within this 30 minutes, the number of effective discharge pulses not less than.2000pC should not exceed More than 30, and within the last 10 minutes, the number of effective discharge pulses not less than.2000pC should not exceed 10. c) After the test, the chromatographic analysis result is qualified and there is no obvious change before and after the test. 9.2 Treatment of unqualified results Partial discharge measurement is a non-destructive test. When the measurement result fails, but no breakdown occurs and the oil chromatographic data and test after the test When there is no significant difference before, the sample should not be rejected immediately, and the user and the manufacturer should negotiate further measures. 10 Identification and suppression of common interference sources 10.1 Corona discharge or floating potential discharge Corona discharge may occur in the test circuit, the outside of the test equipment, the pressure lead and the end of the valve side bushing of the converter transformer under test. Ungrounded metal conductors near the test loop may have floating potential discharge, which will cause interference to partial discharge measurement. Using ultraviolet imaging and other methods The method scans the parts where discharge may occur, and can identify corona discharge or floating potential discharge. The electric field distribution can be improved by increasing the diameter of the wire, installing or optimizing the equalizing ring, and cleaning the surface burrs of the conductive part to eliminate the corona Discharge; measures such as shielding or grounding can eliminate floating potential discharge. 10.2 Internal discharge of test equipment The charging transformer, main capacitor, voltage divider and other components of the high-voltage DC generator may cause internal discharge and cause interference to the partial discharge measurement. Disturb. Using ultrasonic partial discharge detection technology, ultrasonic probes are placed on the external surfaces of components such as charging transformers, main capacitors and voltage dividers to monitor Test the internal discharge of the loop equipment. At the same time, place an ultrasonic probe near the oil tank of the tested converter transformer and the elevated seat of the tested valve side bushing to monitor The internal discharge of the tested converter transformer is used as an auxiliary judgment method for partial discharge measurement. If it is found that the internal discharge of the test equipment interferes with the partial discharge measurement, the test equipment should be repaired or replaced, or a blocking filter should be added. The gain of the wave device suppresses the source of interference. 10.3 Power interference pulse The interference pulse of the field test power supply may cause i......

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