DL/T 1973-2019 English PDFUS$259.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. DL/T 1973-2019: Specification of flow measuring devices for hydropower plant Status: Valid
Basic dataStandard ID: DL/T 1973-2019 (DL/T1973-2019)Description (Translated English): Specification of flow measuring devices for hydropower plant Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: F20 Classification of International Standard: 27.140 Word Count Estimation: 11,161 Date of Issue: 2019 Date of Implementation: 2019-10-01 Issuing agency(ies): National Energy Administration DL/T 1973-2019: Specification of flow measuring devices for hydropower plant---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.Specification of flow measuring devices for hydropower plant ICS 27.140 F 20 People's Republic of China Electric Power Industry Standard Technical conditions for flow measurement devices in hydropower plants 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 Technical requirements...1 4 Test items...4 5 Technical documents...4 6 Marking, packaging, transportation and storage...5 Appendix A (Informative Appendix) Test Method...6 References...8ForewordThis standard is drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation" of. Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the Electric Power Industry Hydropower Station Automation Standardization Technical Committee. Drafting organizations of this standard. China Institute of Water Resources and Hydropower Research, Tianjin Institute of Water Resources and Electric Power, China Three Gorges Corporation, China Qing Datang International Pengshui Hydropower Development Co., Ltd. The main drafters of this standard. Guo Jiang, Jia Yanbo, Liu Xiaobo, Fu Zhiyuan, Li Wenxue, Hu Wenjie, Xu Jun, Li Zhengjia, Yang Xiaosong, Dai Bing The opinions or suggestions during the implementation of this standard are fed back to the Standardization Center of the China Electricity Council (No. 2 Baiguang Road, Xuanwu District, Beijing) Article No. 1, 100761). This standard is issued for the first time. Technical conditions for flow measurement devices in hydropower plants1 ScopeThis standard specifies the technical requirements for the structure, function, performance and test of flow measurement devices for hydropower plants. This standard applies to mechanical flow switches, thermal conductivity flow switches, volute differential pressure flowmeters, electromagnetic flowmeters, time difference Configuration, selection, design and manufacture of sonic flow meters.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 2423.10 Environmental testing of electric and electronic products Part 2.Test method Test Fc. Vibration (sinusoidal) GB 4208 Shell protection grade (IP code) GB 4793.1 Safety requirements for electrical equipment for measurement, control and laboratory use Part 1.General requirements GB/T 11901 Water Quality Determination of Suspended Matter Gravimetric Method GB/T 17214.1 Working conditions of industrial process measurement and control equipment Part 1.Climatic conditions GB/T 18271.3 General performance evaluation methods and procedures for process measurement and control devices. Part 3.Tests for influences DL/T 1107 Basic technical conditions for automation components of hydropower plants JJG 1030 Ultrasonic Flowmeter Verification Regulation JJG 1033 Verification Regulation of Magnetic Flowmeter JB/T 9248 electromagnetic flowmeter3 Technical requirements3.1 Mechanical flow switch 3.1.1 Suitable for generator cooling water, water turbine generator set guide bearing lubrication water, main shaft sealing water, air compressor cooling water, maintenance/leakage drain Flow monitoring of pump lubricating water, main transformer cooling water, unit oil circulation system, and main transformer oil circulation system. 3.1.2 Operating environment a) Temperature. 5℃～40℃; b) Relative humidity. ≤95%, no condensation. 3.1.3 Structural requirements 3.1.3.1 The nozzle diaphragm type and target type (baffle type) structure shall be adopted. 3.1.3.2 The baffle of the target flow switch shall be made of stainless steel or treated with anti-scaling coating. 3.1.3.3 For mechanical flow switches with unidirectional and bidirectional operation, the flow direction identification shall be marked on the shell. 3.1.3.4 The mechanical flow switch used on pipelines of DN40 and below should use threaded connection structure, and the mechanical flow switch used on pipelines of DN50 and above The flow switch should use flange connection structure. 3.1.4 Functional requirements 3.1.4.1 There should be a pair of normally open and normally closed contact outputs. 3.1.4.2 When the pipeline is flowing through or the flow is reduced to the set flow, a signal shall be sent out separately. 3.1.4.3 It should be able to return to zero when there is pressure and no flow. 3.1.4.4 The action value of the flow switch should be adjustable. 3.1.5 Performance requirements 3.1.5.1 Maximum working flow rate. 8m/s. 3.1.5.2 Maximum pressure. 1.5 times the rated working pressure. 3.1.5.3 The measurement error does not exceed 5%FS. 3.1.5.4 Repeated action error. no more than 10% of the maximum set flow value. 3.1.5.5 The minimum operating flow is not more than 25% of the rated flow. 3.1.5.6 Contact capacity. AC220V, ≥3A; DC220V, ≥0.2A. 3.1.5.7 The contact life is not less than 100,000 times. 3.1.5.8 The protection level is not less than IP65. 3.2 Thermal conductivity type flow switch 3.2.1 Suitable for generator cooling water, hydraulic turbine guide bearing lubricating water and sealing water, main shaft sealing water, air compressor cooling water, maintenance/leakage Flow monitoring of drainage pump lubricating water, fire-fighting water, turbine oil system, etc. 3.2.2 Operating environment a) Temperature. 5℃～40℃; b) Relative humidity. ≤95%, no condensation; c) Working power supply. 24VDC or 220VAC. 3.2.3 Structural requirements 3.2.3.1 The probe should be made of stainless steel or treated with anti-scaling coating. 3.2.3.2 The length of the probe should ensure that the probe is always immersed in the medium. 3.2.4 Functional requirements 3.2.4.1 There should be LEDs to display the flow status and alarm indications. 3.2.4.2 There should be relay or NPN/PNP transistor output. 3.2.4 3 The action value of the flow switch is adjustable. 3.2.5 Performance requirements 3.2.5.1 Flow velocity measurement range. water 0.01m/s～1.5m/s, oil 0.03m/s～3m/s. 3.2.5.2 The action error is not more than 5%FS. 3.2.5.3 Contact capacity ≤1000VA/60W, switching current ≤4A. 3.2.5.4 When the analog output is 4-20mA, the linearity error should not exceed 10%. 3.2.5.5 There should be temperature compensation for the entire temperature range. 3.2.5.6 The temperature change response time is not more than 12s. 3.2.5.7 Pressure rating. 10MPa. 3.2.5.8 The protection level is not less than IP67. 3.3 Volute differential pressure flowmeter 3.3.1 It is suitable for the monitoring of the flow measurement of the turbine through the turbine. 3.3.2 It should be composed of volute high and low pressure pressure measuring pipeline, balanced three valve group, differential pressure transmitter and flow monitor. 3.3.3 Functional requirements 3.3.3.1 It should be able to display instantaneous flow and accumulated water volume. 3.3.3.2 There should be 4-20mA, RS232C or RS485, alarm signal, etc. output. 3.3.4 Performance requirements 3.3.4.1 The measurement accuracy of the differential pressure transmitter should not be less than 0.25% FS. 3.3.4.2 The flow is calculated according to formula (1). 3.3.4.3 Excluding the error of the flow coefficient k, the combined error of the volute differential pressure flowmeter is not more than 0.5% FS. 3.4 Electromagnetic flowmeter 3.4.1 It is suitable for the measurement of water flow in technical water supply and fire water supply pipelines. 3.4.2 It shall be composed of magnetic circuit system, measuring catheter, electrode, housing, lining and converter. 3.4.3 Environmental requirements a) Temperature. 5℃～40℃; b) Relative humidity. ≤95%, no condensation; c) Working power supply. 24VDC or 220VAC. 3.4.4 Structural requirements 3.4.4.1 The measuring range of the plug-in electromagnetic flowmeter is 50mm≤DN≤3000mm. 3.4.4.2 The measuring pipe diameter range of the pipeline electromagnetic flowmeter is 10mm≤DN≤3000mm. 3.4.4.3 If the pipeline connecting the sensor is coated with an insulating layer or a non-metallic pipeline, grounding rings should be installed on both sides of the sensor. 3.4.5 Functional requirements 3.4.5.1 It should be able to display instantaneous flow and cumulative flow. 3.4.5.2 It shall have a two-way flow measurement function. 3.4.5.3 It shall have self-diagnosis and reset functions. 3.4.5.4 It shall have 4-20mA, frequency/pulse, passive contact and other outputs. 3.4.6 Performance requirements 3.4.6.1 It shall be applicable to the flow measurement of media with conductivity not less than 20μs/cm. 3.4.6.2 Range of velocity. 0m/s～12m/s. 3.4.6.3 Pressure rating. 0.25MPa～4MPa. 3.4.6.4 When the upstream straight pipe section is not less than 10D and the downstream straight pipe section is not less than 5D, the error of the plug-in electromagnetic flowmeter is not more than 1.0% FS. 3.4.6.5 When the length of the straight pipe section on the upstream side is not less than 5D and the length of the straight pipe section on the downstream side is not less than 3D, the error of the pipeline electromagnetic flowmeter is not more than 0.5% FS. The error is not more than 1.0% FS when measuring a partly full tube. 3.4.6.6 The protection level is not lower than IP67. 3.5 Time difference ultrasonic flowmeter 3.5.1 It is suitable for the measurement of water flow in occasions such as water turbine inlet channel, diversion culvert (tunnel), open channel and technical water supply main. 3.5.2 It shall be composed of the host, signal cable (waterproof cable), cable passer and transducer, and installation accessories. Open channel ultrasonic flow The gauge should also be equipped with a set of water level gauges. 3.5.3 Operating environment a) Temperature. 5℃～40℃; b) Relative humidity. ≤95%, no condensation; c) Working power supply. 24VDC or 220VAC. 3.5.4 Structural requirements 3.5.4.1 The pressure rating of the transducer. ≤4MPa. 3.5.4.2 The transducer should have good hydraulic characteristics, and have a small impact on the flow of water in the flow channel, and should not cause pressure in the flow channel at the installation site Cavitation of the wall. 3.5.5 Functional requirements 3.5.5.1 It shall have the function of two-way measurement. 3.5.5.2 It shall have 4-20mA, pulse, RS232C or RS485, alarm signal and other outputs. 3.5.5.3 It should be able to display instantaneous flow, accumulated water volume, average flow velocity, flow direction, etc. 3.5.5.4 The temperature compensation function shall be provided and it can be adjusted. 3.5.6.5 There should be measures to prevent internal data from being rewritten. 3.5.6 Performance requirements 3.5.6.1 Accuracy grade and repeatability requirements Under the condition that the concentration of suspended solids is not more than 150mg/L and the flow rate is 0.15m/s～10m/s, it should meet the requirements of Table 1. 3.5.6.2 The protection level of the host is not less than IP65; 3.5.6.3 The protection level of the transducer is not less than IP68;4 Test items4.1 The test shall include type test, factory test and field test. 4.2 The test items are shown in Table 2. 4.3 Refer to Appendix A for the test method.Appendix A(Informative appendix) experiment method A.1 Test method A.1.1 Visual inspection test a) The appearance of the flow measurement device should be complete and good, and the markings (nameplate, flow direction mark, etc.) should be correct, complete and clear; b) The flow measuring device should have a good surface treatment, and there should be no burrs, scratches, cracks, rust and peeling of the coating; c) The display content of the meter should be clear, and the text symbols and signs indicating the function should be complete and clear; d) The keys have a moderate feel and no adhesion. A.2.2 Accuracy and repeatability test The ultrasonic flowmeter is carried out according to the method specified in JJG 1030, and the electromagnetic flowmeter is carried out according to the method specified in JJG 1033. A.2.3 Environmental requirements test Carry out according to the test methods specified in GB/T 17214.1 and GB/T 2423.10. A.2.4 Determination of suspended solids Carry out according to the test method specified in GB/T 11901. A.2.5 Power According to the method specified in GB/T 18271.3. A.2.6 Electrical safety According to the provisions of GB 4793.1. A.2.7 Insulation resistance The circuit in the instrument that is conductively connected to the power grid, including the equivalent circuit and the externally accessible conductive part and the chassis The functional insulation resistance value is not less than 2MΩ. There should be a good independent grounding, and the grounding resistance should be less than 10Ω. A.2.8 Insulation strength The power input terminal and the case should be able to withstand 50Hz, AC1500V for 1min without breakdown. A.2.9 Protection level test The sensor is tested according to the method specified in GB 4208, the protection level of the host is not less than IP55, and the protection level of the sensor is not low In IP66, the protection level of the display instrument is not lower than IP65. A.1.10 Seal test Apply the water pressure of 1.5 times the nominal pressure to the flowmeter for 5 minutes, or the air pressure of 1.05 times the nominal pressure for 5 minutes, visual inspection Check, there is no leakage or damage. A.2.11 Hydraulic test After all the measuring pipelines are laid, a hydraulic test is required. The test pressure is 1.5 times the maximum working pressure and lasts 5 minutes. Or the air pressure of 1.05 times the nominal pressure, which lasts for 5 minutes, should not be blocked and leak free. A.2.12 Power-on static test When power is not flowing, the flowmeter should have no output signal. The instantaneous flow and flow indication are 0, and the cumulative flow is not counted. Otherwise, first First check the wiring of the signal line and power line to see if the shielding layer is poorly grounded and the valve is closed in place. A.2.13 Flow dynamic test Close the bypass valve and open the upstream and downstream valves of the flowmeter. After the flow is stable, there should be a uniform and continuous pulse signal and output DC (4~20mA) The signal is stable, the instantaneous flow displayed by the indicator should be stable, and the pointer or LED display should be normal. Adjust the valve opening and the output flow should be changed accordingly. A.2.14 Site inspection After the flowmeter is installed, the following inspection tests should be done before powering on and flow. a) The flanges, valves, pressure measuring holes, temperature measuring holes and joints on the main pipeline and bypass pipeline are well installed and welded, and there should be no leakage; b) The flow direction arrow mark should be consistent with the actual flow direction; c) Check the electrical installation and wiring according to the product manual, and it should be correct. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of DL/T 1973-2019_English be delivered?Answer: Upon your order, we will start to translate DL/T 1973-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of DL/T 1973-2019_English with my colleagues?Answer: Yes. 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