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Basic dataStandard ID: DL/T 2005-2019 (DL/T2005-2019)Description (Translated English): Technical specification of DC voltage transformer Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: K41 Classification of International Standard: 29.180 Word Count Estimation: 20,254 Date of Issue: 2019-06-04 Date of Implementation: 2019-10-01 Quoted Standard: GB/T 311.1; GB/T 2900.94-2015; GB/T 4798.3; GB/T 4798.4; GB 4824; GB/T 11021; GB/T 13540; GB/T 16927.2-2013; GB/T 17626.2; GB/T 17626.3; GB/T 17626.4; GB/T 17626.5; GB/T 17626.8; GB/T 17626.9; GB/T 17626.10; GB/T 17626.11; GB/T 17626.12; GB/T 17626.13 Issuing agency(ies): National Energy Administration Summary: This standard specifies the use conditions, technical requirements, structure and selection requirements, tests, nameplate markings, service life, packaging, transportation and storage, operation and maintenance requirements of DC voltage transformers. This standard applies to the ordering, handover acceptance, operation and maintenance of DC voltage transformers for DC transmission systems with voltage levels of ��1100kV and below. DL/T 2005-2019: Technical specification of DC voltage 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.Technical specification of DC voltage transformer ICS 29.180 K 41 Record number. 63143-2018 People's Republic of China Electric Power Industry Standard Technical conditions for the use of DC voltage transformers 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration Table of contentsForeword...III 1 Scope...1 2 Normative references...1 3 Terms and definitions...2 4 Conditions of use...3 4.1 General requirements...3 4.2 Normal use conditions...3 4.3 Special conditions of use...4 5 Technical requirements...5 5.1 Rated primary voltage (Upr)...5 5.2 Insulation requirements...5 5.3 Temperature rise requirements...7 5.4 Radio Interference Voltage (RIV) Requirements...8 5.5 EMC immunity requirements...8 5.6 Accuracy error limit...9 5.7 Frequency characteristics requirements...9 5.8 Step response requirements...9 5.9 Mechanical strength requirements...9 5.10 Protection level requirements...10 5.11 Supplementary requirements for DC divider...10 5.12 Total attenuation of optical fiber transmission...10 5.13 Analog output requirements...10 5.14 Digital output requirements...10 6 Structure and selection requirements...11 6.1 General requirements...11 6.2 Requirements for gas-filled DC voltage transformers...11 6.3 Secondary terminal overvoltage protection...11 7 Test...12 7.1 Test classification...12 7.2 Type test...12 7.3 Routine test...13 7.4 Special test...13 7.5 Sampling test...14 7.6 On-site handover test...14 8 Nameplate mark...14 9 Lifetime...15 10 Packaging, transportation and storage...15 10.1 Packaging...15 10.2 Factory documents...15 10.3 Transportation...15 10.4 Storage...15 11 Operation and maintenance requirements...16ForewordThis standard is compiled in accordance with 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 Committee (DL/T C 02) of the power industry. Drafting organizations of this standard. China Electric Power Research Institute Co., Ltd., Electric Power Industry Electrical Equipment Quality Inspection and Testing Center, State Grid Operation Branch Si Yibin Management Office, State Grid Jilin Province Electric Power Co., Ltd. Electric Power Research Institute, National High Voltage Metering Station, China Southern Power Grid UHV Transmission Electric Power Company, China Southern Power Grid Co., Ltd. EHV Transmission Company Guangzhou Bureau, China Southern Power Grid Research Institute Co., Ltd., China Power Engineering Consulting Group Northwest Electric Power Design Institute, NARI Relay Electric Co., Ltd., Shanghai Kangkuoguang Sensing Technology Co., Ltd., Xu Ji Group Co., Ltd. The main drafters of this standard. Wang Ling, Ye Guoxiong, Xu Sin, Li Fengqi, Shen Zhigang, Huang Hua, Zhao Shixiang, Tan Bingyuan, Shi Yan Hui, Wang Song, Zhang Shuzhen, Wang Liyan, Qiu Jin, Li Dengyun, Xu Lei, Tian Zhiguo, Huang Yong. 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 China Electricity Council (No. 2 Baiguang Road, Beijing) Number One, 10076). Technical conditions for the use of DC voltage transformers1 ScopeThis standard specifies the terms and definitions, use conditions, technical requirements, structure and selection requirements, tests, markings, Use period, packaging, transportation and storage, etc. This standard applies to the ordering, handover, acceptance, and transportation of DC voltage transformers for DC transmission systems with voltage levels of ±1100kV and below. Line and maintenance.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 311.1 Insulation coordination Part 1.Definitions, principles and rules GB/T 2900.94-2015 Electrical terminology transformer GB/T 4798.3 Environmental conditions for the application of electrical and electronic products Part 3.Stationary use in places with climate protection GB/T 4798.4 Environmental conditions for the application of electrical and electronic products Part 4.Stationary use in non-climate protected places GB/T 4824 Industrial science and medical (ISM) radio frequency equipment electromagnetic disturbance characteristic measurement method and limit GB/T 13540 Seismic requirements for high-voltage switchgear and control equipment GB/T 16927.2-2013 High Voltage Test Technology Part 2.Measurement System GB/T 17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test GB/T 17626.3 Electromagnetic compatibility test and measurement technology Radio frequency electromagnetic field radiation immunity test GB/T 17626.4 Electromagnetic compatibility test and measurement technology Electrical fast transient pulse group immunity test GB/T 17626.5 Electromagnetic compatibility test and measurement technology surge (impact) immunity test GB/T 17626.8 Electromagnetic compatibility test and measurement technology Power frequency magnetic field immunity test GB/T 17626.9 Electromagnetic compatibility test and measurement technology Pulse magnetic field immunity test GB/T 17626.10 Electromagnetic compatibility test and measurement technology Damped oscillation magnetic field immunity test GB/T 17626.11 Electromagnetic compatibility test and measurement technology Voltage sag, short-term interruption and voltage change immunity test GB/T 17626.12 Electromagnetic compatibility test and measurement technology Ring wave immunity test GB/T 17626.13 Electromagnetic compatibility test and measurement technology AC power port harmonics, interharmonic waves and low frequency immunity test of power grid signals GB/T 17626.29 Electromagnetic compatibility test and measurement technology DC power input port voltage sag, short-term interruption and voltage change resistance Disturbance test GB 20840.1 Transformer Part 1.General technical requirements GB/T 20840.7 Transformer Part 7.Electronic Voltage Transformer GB/T 20840.8-2007 Transformer Part 8.Electronic Current Transformer GB/T 21429 Outdoor and indoor hollow composite insulators definition, test methods, acceptance criteria and design recommendations GB/T 26217-2010 DC voltage measuring device for high voltage DC transmission system GB/T 26218.1 Selection and size determination of high-voltage insulators used under dirty conditions Part 1.Definitions, information and general principles GB 50260 Code for seismic design of power facilities3 Terms and definitionsGB/T 26217, GB 20840.1, GB 20840.7, GB 20840.8, GB/T 16927.2 and GB/T 2900.94 and the following The listed terms and definitions apply to this document. For ease of use, some terms are repeated below. 3.1 DC transformer Transformers used to transmit relevant information in the DC system to measuring instruments, meters, and protection or measurement and control devices. [GB/T 2900.94-2015, definition 2.6] 3.2 DC voltage transformer A DC transformer whose secondary voltage is substantially proportional to the primary voltage under normal use conditions. It consists of a DC voltage divider, a converter and Transmission system and other parts. 3.3 DC divider A DC voltage conversion device composed of a high-voltage arm and a low-voltage arm. The DC input voltage is applied to the entire device, while the DC output voltage is taken Since the low pressure arm. [GB/T 26217-2010, definition 3.1] 3.4 Converter A device that converts the signal from the DC voltage divider into a signal suitable for the transmission system (primary converter), or the transmission system The transmitted signal is converted into the quantity (secondary converter) supplied to measuring instruments, meters and control and protection devices. [GB/T 26217-2010, definition 3.13] 3.4 Rated primary voltage The primary voltage value used as a benchmark for voltage transformer performance. [GB/T 2900.94-2015, definition 4.8] 3.5 Maximum continuous voltage of equipment The highest DC voltage that the equipment can withstand for long-term operation. 3.6 Step response When the input is a step wave signal, the relationship between the output of the system and time is shown in Figure 1. Note 1.Rewrite GB/T 16927.2-2013, definition 3.5.3 Figure 1 Step response 3.7 Step response time (Tsr) step response time When the input has a step change, the output reaches the specified percentage of the difference between the final steady-state value and the initial steady-state value from the initial value for the first time time. 3.8 Settling time (Ts) settling time The minimum time required for the deviation between the output and the steady-state value to reach and remain within the specified allowable range (±5%).4 Conditions of use4.1 General requirements Unless otherwise specified, the operating conditions for the rated performance of the DC voltage transformer are the normal operating conditions listed in 4.2. If the actual use conditions are different from the normal use conditions, the DC voltage transformer should be set according to any special use conditions required by the user. It may be adjusted appropriately (see 4.3). See GB/T 4798.3 and GB/T 4798.4 for detailed information about the classification of environmental conditions. 4.2 Normal use conditions 4.2.1 Ambient temperature The ambient temperature is divided into 3 categories, see Table 1. 4.2.2 Altitude The altitude does not exceed 1000m. 4.2.3 Vibration or tremor The vibration or ground vibration of the DC voltage transformer caused by external causes can be ignored. 4.2.4 Other use conditions of indoor DC voltage transformer The other conditions of use considered are as follows. a) The influence of solar radiation can be ignored; b) The ambient air is free from obvious dust, smoke, corrosive gas, steam or salt pollution; c) The humidity conditions are as follows. 1) The average value of relative humidity measured within 24 hours does not exceed 95%; 2) The average value of water vapor pressure within 24 h does not exceed 2.2 kPa; 3) The average relative humidity within one month does not exceed 90%; 4) The average water vapor pressure within one month does not exceed 1.8 kPa. Under the above conditions, condensation may occasionally appear. Note 1.During periods of high humidity, condensation may appear when the temperature changes suddenly. Note 2.In order to be able to withstand the effects of high humidity and condensation and prevent insulation breakdown or corrosion of metal parts, a DC voltage transformer designed under this condition should be used. Note 3.The use of specially designed shells, proper ventilation and heating or the use of dehumidification equipment can prevent condensation. 4.2.5 Other operating conditions of outdoor DC voltage transformers The other conditions of use considered are as follows. a) The average ambient temperature measured within 24 hours does not exceed 35℃; b) Solar radiation level up to 1000 W/m (Noon on a sunny day) should be considered; c) The ambient air may be polluted by dust, smoke, corrosive gas, steam or salt. Its pollution does not exceed that specified in GB/T 26218.1 Pollution level d) The wind pressure does not exceed 0.7 kPa (equivalent to a wind speed of 34 m/s); e) Condensation or precipitation should be considered; f) The thickness of icing shall not exceed 20 mm. 4.3 Special conditions of use 4.3.1 Ambient temperature When the ambient temperature of the installation site obviously exceeds the range of normal use conditions listed in 4.2, the priority minimum and maximum temperature range should be in accordance with Table 2. Regulations. 4.3.2 Altitude When the altitude exceeds 1000 m, the rated insulation level of external insulation shall be corrected according to 5.2.6. 4.3.3 Vibration or tremor Switch operation or short-circuit electric power can cause vibration. For DC voltage transformers assembled in other equipment, the vibration generated by the equipment should be considered move. 4.3.4 Earthquake The seismic intensity is divided into 7 and 8 degrees, which should meet the requirements of GB 50260 and GB/T 13540.5 Technical requirements5.1 Rated primary voltage (Upr) Preferred value of rated primary voltage of DC voltage transformer. 50kV, 125kV,.200kV, 320kV, 400kV, 500kV, 660kV, 800kV, 1100 kV. 5.2 Insulation requirements 5.2.1 Primary insulation level The insulation level of the primary end of the DC voltage transformer should not be lower than the requirements in Table 3. 5.2.2 The insulation level of the secondary circuit and low-voltage end of the DC divider The voltage divider tap of the DC voltage divider (low-voltage device branch is disconnected) should be able to withstand 1min short-term power frequency withstand voltage 3kV (effective value) and 3 The lightning impulse voltage is 5kV. The low-voltage terminal should be able to withstand 1min short-time power frequency withstand voltage. 3kV (effective value). 5.2.3 Cut off lightning impulse voltage The primary voltage terminal should be able to withstand the cut-off lightning impulse voltage, and its peak value is 115% of the rated lightning impulse voltage. 5.2.4 Partial discharge level During the DC withstand voltage and polarity reversal test, the number of pulses with partial discharge greater than 1000pC in the last 10 minutes should not exceed 10. Partial discharge measurement is performed during the power frequency withstand voltage test. The partial discharge level under the partial discharge measurement voltage specified in Table 4 shall not exceed 5.2.6 External insulation requirements 5.2.6.1 General requirements The DC voltage transformer should adopt a composite insulating jacket, which should meet the requirements of GB/T 21429. 5.2.6.2 Creepage ratio For outdoor DC voltage transformers that are susceptible to pollution, the minimum uniform creepage distances under different pollution levels are shown in Table 5. 5.2.6.3 The influence of altitude on external insulation When the altitude of the installation location exceeds 1000m, the external insulation test voltage should be multiplied by the rated withstand voltage by the altitude correction factor specified in GB 311.1 The number is ok. Note. The dielectric strength of the internal insulation is not affected by altitude. The inspection method of the external insulation is determined by the manufacturer and the user through consultation. 5.2.6.4 The influence of self-heating on external insulation The self-heating of the DC voltage transformer will cause uneven temperature gradient distribution in the vertical direction, which is easy to cause DC partial voltage under dirty and humid conditions Distortion of the electric field of the outer casing of the device, causing insulation failure, should be considered by the manufacturer and user. 5.2.7 Insulation requirements for low-voltage devices Low-voltage devices generally include multiple independent circuits electrically insulated from each other, and their insulation should meet the requirements of Table 6. 5.3 Temperature rise requirements 5.3.1 General requirements When the primary voltage of the DC voltage transformer is the highest continuous voltage of the equipment, the temperature rise of each part should not exceed the corresponding value listed in Table 7. If the specified ambient temperature exceeds the value listed in 4.2.1, the allowable temperature rise value in Table 7 should be subtracted from the excess value of the ambient temperature. 5.3.2 The influence of altitude on temperature rise If the DC voltage transformer is specified to be used in areas with an altitude of more than 1000m, and the altitude of the test site is lower than 1000m, the temperature rise limit in Table 7 The value should be minus 0.5% for every 100m after the altitude of the work site exceeds 1000m (see Figure 2). 5.4 Radio Interference Voltage (RIV) requirements When this test is carried out under AC power frequency voltage, the radio interference voltage should not be greater than 2500μV under the test voltage of 1.1Udm/2. There should be no visible corona on a clear day at night. If the test uses DC voltage, the specific test method and requirements are determined by the user and the manufacturer. 5.5 EMC immunity requirements 5.5.1 Launch requirements In addition to the emission requirements contained in the radio interference voltage test (RIV test), the emission limits considered in GB 4824 are also applicable to For DC voltage transformers, the specified value of the test limit is Group 1, Class A. 5.5.2 Immunity requirements The electromagnetic compatibility performance of the DC voltage transformer shall meet the requirements of Table 8. 5.6 Accuracy error limit The standard accuracy levels of DC voltage transformers are. 0.2, 0.5.The accuracy level error limit of the DC voltage transformer is shown in Table 9. 5.7 Frequency characteristic requirements Under the frequency of 50Hz~2000Hz, the amplitude error of the DC voltage transformer should not exceed 1%. The cut-off frequency of the DC voltage transformer should not be less than 7kHz. 5.8 Step response requirements a) The maximum overshoot should be less than 15%; b) The response time Tsr should be less than 250μs; c) The setup time should be less than 10Tsr. 5.9 Mechanical strength requirements 5.10 Protection level requirements The protection performance of the outdoor junction box should at least meet the requirements of IP67, and the protection performance of the secondary converter and the merging unit (if any) should be at least Meet the requirements of IP30. 5.11 Supplementary requirements for DC divider The supplementary requirements for the DC divider are as follows. a) The resistance change of the high-voltage arm resistance before and after the insulation test should be less than 0.1%, and the resistance change of the low-voltage arm should be less than 0.05%; b) The capacitance of the high-voltage arm and the capacitance of the low-voltage arm should not change significantly before and after the insulation test; c) The RC time constant of the high-voltage arm and the equivalent RC time constant of the low-voltage arm should be equal; d) For a multi-output voltage divider, the failure of any one path shall not affect the output of other branches. 5.12 Total attenuation of optical fiber transmission The total attenuation of optical fiber transmission should be less than 2dB. 5.13 Analog output requirements 5.13.1 Rated value of analog output The rated value of the analog output is negotiated and determined by the user and the manufacturer. 5.13.2 Design requirements for analog output The design of analog voltage output should meet the requirements of 6.3 in GB/T 20840.8-2007. 5.14 Digital output requirements 5.14.1 Rated value of sampling rate The sampling rate is rated as 10kHz, 50kHz, 96kHz. Other values of the rated sampling rate can be negotiated by the user and the manufacturer according to the engineering requirement...... |
