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Basic dataStandard ID: DL/T 1015-2019 (DL/T1015-2019)Description (Translated English): Guide for application of voltage measuring system in DC&AC high voltage tests on site Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: F24 Word Count Estimation: 15,135 Date of Issue: 2019-06-04 Date of Implementation: 2019-10-01 Older Standard (superseded by this standard): DL/T 1015-2006 Regulation (derived from): Natural Resources Department Announcement No. 7 of 2019 Issuing agency(ies): National Energy Administration DL/T 1015-2019: Guide for application of voltage measuring system in DC&AC high voltage tests on site---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 application of voltage measuring system in DC ICS 27.100 F 20 People's Republic of China Electric Power Industry Standard Replace DL/T 1015-2007 On-site DC and AC withstand voltage test Guidelines for the use of voltage measurement systems Refractory materials for boilers in thermal power plants 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...1 4 Requirements for the use of on-site DC withstand voltage test and measurement system...1 4.1 Requirements for DC test voltage measurement system...1 4.2 Classification of DC test voltage measurement system...1 4.3 Calibration period of DC test voltage measurement system...3 4.4 Influencing factors of DC test voltage measurement error and methods to reduce the error...3 5 Requirements for the use of on-site AC withstand voltage test measurement system...4 5.1 Requirements for AC test voltage measurement system...4 5.2 Classification of AC test voltage measurement systems...4 5.3 Check of AC test voltage waveform...6 5.4 Calibration period of AC test voltage measurement system...7 5.5 Influencing factors of AC test voltage measurement error and methods to reduce the error...7 Appendix A (informative appendix) Analysis and estimation method of measurement error in field DC and AC withstand voltage test...8ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is a revision of DL/T 1015-2006 "Guidelines for the Use of Field DC and AC Withstand Voltage Test Voltage Measurement System". The content to be revised is as follows. --Update the normative references; -Add "Terms and Definitions" clause; - According to GB/T 16927.3-2010, revise the corresponding chapters of the standard; --Increase the applicable voltage measurement range of the high-voltage electrostatic voltmeter; -Delete the "ball gap measurement method" in the "on-site AC withstand voltage test measurement system"; --Delete "Verification method with capacitor voltage divider and digital storage oscilloscope" in "Verification of AC test voltage waveform"; --Fix the "error caused by the electric field of the conductor with AC voltage on site" and the "error caused by the parasitic capacitance of the series high voltage capacitor" Replaced with "measurement error caused by live conductor"; -Modify the factors affecting the measurement error; -Modify the estimation method of measurement error in Appendix A. After the implementation of this standard, it will replace DL/T 1015-2006. This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the Power Industry High Voltage Test Technology Standardization Technical Committee. The organization responsible for drafting this standard. State Grid Hubei Electric Power Co., Ltd. Electric Power Research Institute, Wuhan University School of Electrical Engineering Participated in the drafting of this standard. North China Electric Power Research Institute Co., Ltd., Suzhou Huadian Electric Technology Co., Ltd. Drafters of this standard. Zhang Zhi, Wang Yongqin, He Jiahui, Tong Xin, Wang Jianguo, Cai Wei, Guo Shouxian, Wu Tong This standard was first released on September 14,.2006, and this is the first revision. The opinions and suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (Baiguang Road, Xicheng District, Beijing) Er Tiao No. 1, 100761). Guidelines for the use of field DC and AC withstand voltage test voltage measurement systems1 ScopeThis standard specifies the requirements for the use of on-site DC and AC withstand voltage test and measurement systems. This standard applies to DC high voltages in power plants, substations, etc., as well as power equipment manufacturers, repair shops, and laboratories. And AC high voltage test.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 16927.3-2010 High Voltage Test Technology Part 3.Definition and Requirements of Field Test3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 On-site test In the test conducted at the place where the electrical equipment to be tested and the facility are used, the equipment should be as consistent as possible in the operating state. 3.2 Measuring system A complete set of devices suitable for AC and DC high voltage measurement. 4 Requirements for the use of on-site DC withstand voltage test and measurement system 4.1 Requirements for DC test voltage measurement system An effective traceable measurement system shall be used for measurement and shall meet the requirements of GB/T 16927.3-2010.The test voltage value shall be measured (arithmetic The total uncertainty of the average) does not exceed 5%. If there is ripple and the ripple factor is less than 3%, these uncertainty limits should not be exceeded. Note. The total uncertainty refers to the combined result of each measurement uncertainty component measured on site. 4.2 Classification of DC test voltage measurement systems 4.2.1 General principles The on-site DC withstand voltage test voltage measurement system generally includes. a) Measuring system with high resistance resistor in series with DC microammeter; b) Measuring system of resistance voltage divider and low voltage voltmeter; c) High-voltage electrostatic voltmeter. 4.2.2 Measuring system with high resistance resistor and DC microammeter in series Figure 1 shows the principle wiring diagram of the measurement system with a high-resistance resistor in series with a DC microammeter. The resistance value of the resistor should be stable, choose its resistance value according to the working current of 0.5mA~1mA, and check the resistance under the working current The power loss must not exceed the rated power of the resistor. The insulating sleeve of high resistance resistor should not be divided into sections. The high potential end should be equipped with a voltage equalization device, and the low potential end should be equipped with a shielding device. The external insulation of high resistance resistors should not flashover along the surface during voltage measurement. The field strength of the effective insulation length on the surface of the insulation cylinder can be 150kV/m design. When the altitude of the place of use exceeds 1000m, the design should be based on the actual altitude. 4.2.3 Measuring system of resistance divider and low voltage voltmeter The principle wiring diagram of the measuring system composed of resistance divider and low voltage voltmeter is shown in Figure 2. The resistance value of the resistor divider should be stable and the voltage division ratio should be accurate. The selection of high-voltage arm resistance of resistance divider and 4.2.2 medium and high resistance resistors The selection requirements are the same. The input resistance of the low-voltage voltmeter connected in parallel with the resistance of the low-voltage arm of the resistor divider should not be less than 100 of the resistance of the low-voltage arm of the voltage divider Times. Low-voltage voltmeter can choose electrostatic voltmeter or digital voltmeter. The low-voltage arm resistance R2 contains the input resistance value of the low-voltage voltmeter. If the low-voltage voltmeter uses an electrostatic voltmeter or a high-power For digital voltmeters with input resistance, the influence of its input resistance on the voltage divider ratio of the resistance divider can be ignored. 4.2.4 High-voltage electrostatic voltmeter When the test voltage is not higher than 30kV, an electrostatic voltmeter can be used for on-site measurement. The high-voltage electrostatic voltmeter is an instrument that directly measures the effective value of the voltage. When the ripple factor S of the measured DC voltage is not greater than 3%, use Use a high-voltage electrostatic voltmeter to measure the DC voltage. At this time, the indicated value of the electrostatic voltmeter can be used as the average value of the measured DC voltage. When using a high-voltage electrostatic voltmeter to measure the DC test voltage, you should check in advance whether the components of the high-voltage electrostatic voltmeter are normal and the insulation Whether the surface of the pillar is clean and dry, there should be no wind and no ion current at the test site. 4.3 Calibration period of DC test voltage measurement system The voltage measurement system used for on-site DC tests should be calibrated every two years. 4.4 Influencing factors of DC test voltage measurement error and methods to reduce the error 4.4.1 Measurement errors caused by changes in resistor parameters The resistance change of the resistor of the DC test voltage measurement system will directly cause measurement errors. Therefore, keep the resistor surface dry and clean clean. If necessary, the resistor can also be immersed in insulating oil, which can effectively suppress or eliminate the effects of corona and surface leakage current, and reduce The low temperature rises to maintain the stability of the resistance value and reduce the insulation size of the entire resistor. There should be no corona discharge at the high voltage end of the resistor, For this reason, a shield electrode with a larger diameter should be installed on the high-voltage end of the resistor. The radius of curvature of the electrode should be large enough and the surface should be smooth. The diameter is generally 1/4~1/3 of the height of the entire resistor. In the measurement, attention should be paid to the errors that may be caused by the electrostatic charge on the DC microammeter. 4.4.2 Measurement error caused by input resistance of low voltage voltmeter When using a resistance divider and a low-voltage voltmeter measurement system, the input resistance of the low-voltage voltmeter will change the used resistance divider according to its The voltage division ratio calculated by the high-voltage arm resistance R1 and the low-voltage arm resistance R2 will cause measurement errors. 4.4.3 Use an effective value voltmeter to measure the measurement error caused by the average value of the DC voltage with ripple Using an effective value voltmeter, such as an electrostatic voltmeter, to measure the average value of a rippled DC voltage will have a certain measurement error. Dangwen When the wave factor S >0.35, the measurement error will be greater than 3%. Therefore, when using an electrostatic voltmeter to measure the average value of DC voltage, the measured DC The ripple factor S of the pressure should be less than 3%. 4.4.4 Measurement errors caused by the electric field of live objects When the resistance element of the measurement system with a high resistance resistor in series with a DC microammeter is exposed to the air and close to the DC high voltage wire, The ion current of high-voltage wires can cause measurement errors. If the resistance element is installed in the insulating sleeve, the measurement error caused by the ion current can be reduced. The electric field of the conductor with AC voltage will not cause the measurement error of the voltage average value of the above-mentioned DC voltage measurement system. When using a measuring system with a resistance divider and a low-voltage RMS voltmeter, if it is close to the AC high-voltage conductor, the The field will cause measurement errors in the average value of the DC voltage. Use a method far away from the AC high-voltage conductor to reduce or eliminate the electric field caused by the AC high-voltage conductor For measurement error, please refer to Appendix A, A.1 for its estimation method. In order to reduce the impact of the high-voltage part on the low-voltage measurement circuit, if necessary, the low-voltage components and measuring instruments can be installed in a metal shielded box. And the shielding box is grounded, and the connecting wire for low voltage measurement is shielded wire. 5 Requirements for the use of on-site AC withstand voltage test measurement system 5.1 Requirements for AC test voltage measurement system The value of AC test voltage refers to its peak value divided by 2.The test voltage should generally be a sinusoidal AC voltage with a frequency of 10 Hz to 500 Hz. Such as If the ratio of the peak value to the effective value is within 2 ± 15%, the slight distortion of the sine waveform does not affect the result of the high voltage test. An effective traceable measurement system should be used for measurement. Generally, the uncertainty of the peak value of the measured test voltage is required to be 5%. The frequency characteristics of the transformer and voltmeter in the measurement system should meet the requirements of the frequency characteristics of the test voltage. 5.2 Classification of AC test voltage measurement systems 5.2.1 General principles The measurement system of AC test voltage generally includes. a) Measuring system of capacitive voltage divider and low voltage voltmeter; b) Measuring system of resistance voltage divider and low voltage voltmeter; c) Measuring system with high voltage capacitor in series with rectifier bridge; d) High voltage voltage transformer; e) High-voltage electrostatic voltmeter; f) Measuring system with high-voltage capacitor and AC milliamp meter in series; 5.2.2 Measuring system of capacitive voltage divider and low voltage voltmeter 5.2.3 Measuring system of resistance divider and low voltage voltmeter The measuring system of resistance voltage divider and low-voltage voltmeter is generally used to measure AC test voltage of 100kV and below, and its principle wiring The diagram is the same as Figure 2. Low-voltage voltmeters should use high-input impedance electrostatic voltmeters or digital voltmeters to prevent the input impedance of the voltmeter from dividing the resistance. The influence of the voltage divider ratio. 5.2.4 Measuring system with high voltage capacitor in series with rectifier bridge The principle wiring diagram of the measurement system in which the high-voltage capacitor is connected in series with the rectifier bridge is shown in Figure 4.When the AC test voltage is a non-sinusoidal voltage, but The positive and negative half-waves are symmetrical and contain only one peak. At this time, the AC test can be measured with the high-voltage capacitor in series with the rectifier bridge as shown in Figure 4. Check the peak value of the voltage. 5.2.5 Measuring system of high voltage voltage transformer and low voltage voltmeter The principle wiring diagram of the measurement system of the high voltage voltage transformer and the low voltage voltmeter is shown in Figure 5. 5.2.6 High-voltage electrostatic voltmeter When the test voltage is not higher than 30kV, an electrostatic voltmeter can be used for on-site measurement. It can be directly measured with a high-voltage electrostatic voltmeter Measure the AC test voltage. Before measuring, check whether the performance of the electrostatic voltmeter is good. There should be no wind and no corona during measurement, and ensure that Keep the surface of the insulating pillar clean and dry. 5.2.7 Measuring system with high-voltage capacitor and AC milliamp meter in series The principle wiring diagram of the measurement system with a high-voltage capacitor in series with an AC milliamp meter is shown in Figure 6.When reading the indicated value of the milliammeter, you should At the same time, read the frequency of the tested AC test voltage. The requirements for the high-voltage capacitor C are the same as those for the high-voltage arm capacitor C1 of the capacitive voltage divider in 5.2.2 The requirements are the same. The measured AC test voltage U is obtained from the capacitance value C of the high-voltage capacitor and the indicated value I of the AC milliamp meter, as follows. 5.3 Check of AC test voltage waveform 5.3.1 The method of checking the ratio of the peak value of the AC test voltage to its effective value Connect a low-voltage peak voltmeter and a low-voltage RMS voltmeter to the low-voltage arm capacitor C2 of the capacitive voltage divider shown in Figure 3, and read at the same time Calculate the ratio between the peak value Um and the effective value U of the measured AC test voltage, and the ratio Um/U is required to be within the range of 215% ±. 5.3.2 Checking method of harmonic analyzer Connect the harmonic analyzer to the capacitor C2 of the low-voltage arm of the capacitor voltage divider to obtain the peak sum of the harmonic components of the measured AC test voltage The effective value requires that the total harmonic distortion rate of the voltage is not more than 5%. 5.4 Calibration period of AC test voltage measurement system The AC test voltage measurement system used in the on-site AC withstand voltage test shall be calibrated every two years. 5.5 Influencing factors of AC test voltage measurement error and methods to reduce the error 5.5.1 Errors caused by the input impedance of the low-voltage voltmeter and the capacitance of the measuring cable The input impedance of the low-voltage voltmeter and the capacitance of the measuring cable will affect the voltage divider used according to the component parameters of the voltage divider. Pressure ratio. Therefore, a low-voltage electrostatic voltmeter or digital voltmeter with high input impedance should be used at this time, and the capacitive reactance of the measuring cable should be included in the partial voltage Obtain the equivalent impedance of the low-voltage arm of the low-voltage arm, and recalculate the voltage divider ratio. For the AC test voltage measurement system based on the capacitive voltage divider, the voltage divider ratio is easily affected by the high-voltage connection leads and the voltage divider inside the test system. The influence of the stray capacitance generated by the external live conductor of the test system. At this time, the estimation method of measurement error is shown in Appendix A.2. In order to prevent the high-voltage part from coupling to the low-voltage arm measurement loop, the entire low-voltage arm should be placed in a grounded metal shielded box to measure The wire of arm voltage adopts shielded cable. In order to reduce the error caused by the parasitic capacitance, a shield electrode with a larger diameter can be installed on the top of the series high-voltage capacitor. A shielding cover is also installed at the section of the capacitor. The radius of curvature of the shield electrode should be large enough and the surface should be smooth. The diameter of the top shield electrode It is generally 1/4~1/3 of the height of the capacitor column. 5.5.3 Errors caused by corona discharge on high-voltage connecting wires Because the corona discharge on the high-voltage connecting wire will cause measurement errors, it is necessary to try to eliminate the corona on the high-voltage connecting wire. Such as increasin......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of DL/T 1015-2019_English be delivered?Answer: Upon your order, we will start to translate DL/T 1015-2019_English as soon as possible, and keep you informed of the progress. 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