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Basic dataStandard ID: DL/T 2004-2019 (DL/T2004-2019)Description (Translated English): (DC current transformer use technical conditions) Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: K41 Word Count Estimation: 22,289 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 2004-2019: (DC current transformer use technical conditions)---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 current 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 current 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...4 5.1 Rated primary current...5 5.2 Overload current...5 5.3 Rated short-time thermal current...5 5.4 Rated dynamic stability current...5 5.5 Rated voltage...5 5.6 Insulation requirements...5 5.7 Temperature rise requirements...7 5.8 Radio interference voltage requirements...8 5.9 Electromagnetic compatibility requirements...8 5.10 Accuracy error limit...9 5.11 Frequency characteristic requirements...9 5.12 Step response...9 5.13 Mechanical strength...9 5.14 Degree of protection...10 5.15 Optical fiber transmission signal attenuation...10 5.16 Analog output rating...10 5.17 Digital output requirements...10 6 Structure and selection requirements...10 6.1 General requirements...10 6.2 Requirements for dry-type DC current transformers...11 6.3 Requirements for oil-filled DC current transformers...11 6.4 Requirements for gas-filled DC current transformers...11 7 Test...11 7.1 Test classification...11 7.2 Type test...11 7.3 Routine test...12 7.4 Special test...13 7.5 Sampling test...14 7.6 On-site handover test...14 8 Logo...14 8.1 Terminal mark...14 8.2 Nameplate mark...14 9 Lifetime...15 10 Packaging, transportation and storage...16 10.1 Packaging...16 10.2 Factory documents...16 10.3 Transportation and storage...16 11 Operation and maintenance requirements...16ForewordThis standard is compiled in accordance with the requirements 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. The main drafting organizations of this standard. China Electric Power Research Institute Co., Ltd., Power Industry Electrical Equipment Quality Inspection and Testing Center, State Grid Operation Branch Yibin Management Office, State Grid Operation Branch Yibin Management Office, State Grid Jilin Province Electric Power Co., Ltd. Electric Power Research Institute, South Fang Power Grid Scientific Research Institute Co., Ltd., China Southern Power Grid EHV Transmission Company, China Southern Power Grid Co., Ltd. Guangzhou Bureau of High Voltage Transmission Company, Northwest Electric Power Design Institute of China Power Engineering Consulting Group, National High Voltage Metering Station, TBEA Kangjia (Shenyang) Transformer Co., Ltd., Xu Ji Group Co., Ltd., NARI Jibao Electric Co., Ltd., Yineng Qianyuan (Beijing) Power Technology Co., Ltd., Shanghai Kangkuoguang Sensing Technology Co., Ltd., Fujian Puhua Electronic Technology Co., Ltd. The main drafters of this standard. Tong Yue, Liu Xiang, Ye Guoxiong, Huang Hua, Li Fengqi, Shen Zhigang, Zhao Shixiang, Wang Song, Tan Bing Yuan, Shi Yanhui, Zhang Shuzhen, Wang Liyan, Li He, Teng Xiaohong, Tian Zhiguo, Xu Lei, Liu Dongwei, Huang Yong, Cai Guoqing. 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 (Baiguang, Xuanwu District, Beijing) No. 1, Lu Er Tiao, 100761). Technical conditions for the use of DC current transformers1 ScopeThis standard specifies the terms and definitions, use conditions, technical requirements, structure and selection requirements, tests, markings, and Use period, packaging, transportation and storage, etc. This standard applies to the ordering, handover, acceptance, and transportation of DC current 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 2900.50 Electrotechnical terminology Generic terminology for power generation, transmission and distribution GB/T 2900.57 Electrician Terminology Power Generation, Transmission and Distribution Operation GB/T 2900.94 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 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 oscillating 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 immunity Degree test GB 20840.1 Transformer Part 1.General technical requirements GB 20840.2 Transformers Part 2.Supplementary technical requirements for current transformers GB/T 20840.8-2007 Transformer Part 8.Electronic Current Transformer GB/T 21429 Definition, test methods, acceptance criteria and design recommendations of hollow composite insulators for outdoor and indoor electrical equipment GB/T 26216.1 DC current measuring device for high voltage direct current transmission system Part 1.Electronic DC current measuring device GB/T 26216.2 Direct current measuring device for high voltage direct current transmission system Part 2.Electromagnetic direct current measuring device 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 facilities DL/T 1000.3 Guidelines for the use of insulators for overhead lines with a nominal voltage higher than 1000V. Part 3.Rod suspension composites for AC systems insulator3 Terms and definitionsAs defined by GB/T 2900.94, GB/T 2900.50, GB/T 2900.57, GB 20840.1, GB 20840.2 and GB/T 20840.8 And the following terms and definitions apply to this standard. 3.1 DC current transformer A device that provides information signals corresponding to the direct current of the primary loop, which can provide information for measuring instruments, meters, and protection or control equipment Information signal. 3.2 Electronic DC current transformer A DC current transformer, which is composed of one or more current sensors connected to a transmission system and a secondary converter to transmit positive Compared to the measured quantity, under normal use conditions, the output of the secondary converter is proportional to the primary loop DC current. 3.3 Electromagnetic DC current transformer The primary sensor uses the principle of electromagnetic induction to provide a signal corresponding to the primary DC current, and the signal is directly sent to itself through the cable In electronic equipment. 3.4 Maximum continuous voltage of equipment The highest DC voltage that the equipment can withstand for long-term operation. 3.5 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 3.6 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. 3.7 Setting time (Ts) setting 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 current transformer are the normal operating conditions listed in 4.2. If the actual use conditions are different from the normal use conditions, the transformer should be designed according to any special use conditions required by the user, or Appropriate adjustments are required, 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 current transformer caused by external causes can be ignored. 4.2.4 Other usage conditions of indoor 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 24h does not exceed 95%; 2) The average value of water vapor pressure within 24h does not exceed 2.2kPa; 3) The average relative humidity within one month does not exceed 90%; 4) The average water vapor pressure within one month does not exceed 1.8kPa. 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 current 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 conditions of use of outdoor transformers The other conditions of use considered are as follows. a) The average ambient temperature measured within 24 hours does not exceed 35 °C; b) Solar radiation level up to 1000W/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. Required. 4.3.2 Altitude When the altitude exceeds 1000m, the rated insulation level of external insulation shall be corrected according to 5.6.4. 4.3.3 Vibration or tremor Switch operation or short-circuit electric power can cause vibration. For transformers assembled in other equipment, the vibration generated by the equipment should be considered. 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 current (Ipr) The preferred value of rated primary current of DC current transformer. 500A, 600A, 1200A, 3000A, 3125A, 4000A, 4500A, 5000A, 6250A, 8000A. 5.2 Overload current The DC current flowing through the DC current transformer during the overload operation of the DC system includes continuous, 2h or several seconds and other different durations, The current value is determined according to specific engineering research. 5.3 Rated short-time thermal current The actual value of the rated short-time thermal current is determined according to specific engineering requirements. When there is no specific engineering requirement, the DC current transformer should be able to pass If the short-term thermal current is 6 times of the rated primary current, the duration of the short-term thermal current is 1s. 5.4 Rated dynamic stability current The rated dynamic stability current is 2.5 times the rated short-time thermal current. 5.5 Rated primary voltage (Upr) Preferred value of rated primary voltage of DC current transformer. 50kV, 125kV,.200kV, 320kV, 400kV, 500kV, 660kV, 800kV, 1100 kV. 5.6 Insulation requirements 5.6.1 Primary insulation level The insulation level of the primary end of the DC current transformer shall not be lower than the requirements of Table 3. 5.6.2 Cut off lightning impact 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. 5.6.3 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 10min should not exceed 10. Partial discharge measurement is carried out during the power frequency withstand voltage test, and the partial discharge level under the partial discharge measurement voltage specified in Table 4 should not exceed Exceed the limits specified in Table 4. 5.6.4 External insulation requirements 5.6.4.1 General requirements The DC current transformer should adopt a composite insulating jacket, which should meet the requirements of GB/T 21429. 5.6.4.2 Creepage ratio For outdoor current transformers that are susceptible to pollution, the minimum uniform creepage distances under different pollution levels are shown in Table 5. 5.6.4.3 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. 5.6.5 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. 5.7 Temperature rise requirements 5.7.1 General requirements When the primary current of the DC current transformer is the rated current and the overload current, 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. 5.7.2 The influence of altitude on temperature rise If the DC current 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 the following values for every 100m after the altitude of the work site exceeds 1000m (see Figure 2). a) Oil-immersed transformer. 0.4%; b) Dry-type and gas-insulated transformers. 0.5%. Figure 2 Altitude correction factor for temperature rise The altitude correction factor for temperature rise is wrong! The reference source was not found. Where. --The temperature rise at altitude; --The temperature rise limit specified in Table 7 (at altitude); 5.8 Radio Interference Voltage (RIV) requirements When conducting this test under AC power frequency voltage, the radio interference voltage should not be greater than 2500μV under the test voltage of 1.1Udm/2.clear There should be no visible corona at night. If the test uses DC voltage, the specific test method and requirements shall be determined by the manufacturer and the user through consultation. 5.9 EMC requirements 5.9.1 Launch requirements In addition to the emission requirements of the radio interference voltage test (RIV test), the emission limits considered in GB 4824 are also applicable to electronic For DC current transformers, the specified value of the test limit is Group 1, Class A. 5.9.2 Immunity requirements The electromagnetic compatibility performance of the DC current transformer should meet the requirements of Table 8. 5.10 Accuracy error limit The accuracy level of the DC current transformer is stated as the percentage of the maximum allowable current error specified under the rated current. The standard accuracy level is. 0.2, 0.5. For the above-mentioned accuracy grade DC current transformer, the current error should not exceed the limit listed in Table 9. 5.11 Frequency characteristic requirements For electronic DC current transformers, the amplitude error does not exceed 0.5% and the phase angle error does not exceed 500µs at 50Hz～1500Hz. For electromagnetic DC current transformers, the error does not exceed 3% at 50Hz～1500Hz. The cut-off frequency is not less than 7kHz. 5.12 Step response requirements a) The maximum overshoot should be less than 15%; b) The response time Tsr should be less than 400μs; c) The setup time should be less than 10Tsr. 5.13 Mechanical strength requirements Table 10 lists the static load that the DC current transformer should be able to withstand, including the load caused by wind and ice. The specified test load refers to Loads in any direction can be applied to the primary terminal. 5.14 Degree of protection The protective performance of the parts with sealing requirem......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of DL/T 2004-2019_English be delivered?Answer: Upon your order, we will start to translate DL/T 2004-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of DL/T 2004-2019_English with my colleagues?Answer: Yes. The purchased PDF of DL/T 2004-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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