GBZT189.3-2018 English PDFUS$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GBZT189.3-2018: Measurement of physical agents in workplace -- Part 3: electric field and magnetic field between 1Hz and 100kHz Status: Valid GBZT189.3: Historical versions
Basic dataStandard ID: GBZ/T 189.3-2018 (GBZ/T189.3-2018)Description (Translated English): Measurement of physical agents in workplace -- Part 3: electric field and magnetic field between 1Hz and 100kHz Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: C60 Word Count Estimation: 7,741 Date of Issue: 2018-07-16 Date of Implementation: 2019-07-01 Older Standard (superseded by this standard): GBZ/T 189.3-2007 Regulation (derived from): State-Health-Communication (2018) No.13 Issuing agency(ies): National Health and Family Planning Commission GBZ/T 189.3-2018: Measurement of physical agents in workplace -- Part 3: electric field and magnetic field between 1Hz and 100kHz---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. Measurement of physical agents in workplace - Part 3. electric field and magnetic field between 1Hz and 100kHz ICS 13.100 C 52 National Occupational Health Standards Replace GBZ /T 189.3-2007 Workplace physical factor measurement Part 3. 1 Hz to 100 kHz electric and magnetic fields Measurement of physical agents in workplace- Part 3. electric field and magnetic field between 1Hz and 100kHz Published on.2018 - 07 - 16 2019 - 07 - 01 implementation National Health and Wellness Committee of the People's Republic of China ForewordThis standard is formulated in accordance with the Law of the People's Republic GBZ /T 189 "Measurement of Physical Factors in the Workplace" is now divided into the following 11 parts. -- Part 1. Ultra-high frequency electromagnetic fields; -- Part 2. High frequency electromagnetic fields; -- Part 3. 1 Hz to 100 kHz electric and magnetic fields; -- Part 4. Laser radiation; -- Part 5. Microwave radiation; -- Part 6. Ultraviolet radiation; -- Part 7. High temperature; -- Part 8. Noise; -- Part 9. Hand-transmitted vibration; -- Part 10. Grading of physical labor intensity; -- Part 11. Heart rate during physical labor. This part is the third part of GBZ /T 189. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GBZ /T 189.3-2007 "Workplace physical factors measurement Part 3. Power frequency electric field", and GBZ /T 189.3-2007 The changes in the main technical content are as follows. -- Extend the measurement content to 1 Hz to 100 kHz electric and magnetic fields; -- Make corresponding provisions on the measurement object, height, readings and precautions, see 4.2~4.5; - Increased use of measurement results, see 5.1 and 5.2; -- Increased the calculation method of the time-weighted average of the power frequency field strength of the 8h workplace, see 6.1 and 6.2. This section drafted by. Guangdong Provincial Occupational Disease Prevention and Treatment Institute, China Center for Disease Control and Prevention, Occupational Health and Poison Control, State Grid Jilin Provincial Electric Power Co., Ltd. Electric Power Research Institute, Guangzhou Occupational Disease Prevention and Treatment Institute, Foshan Occupational Disease Prevention and Treatment Institute, Peking University, Tianjin Disease Prevention and Control Center, Beijing Municipal Center for Disease Control and Prevention, Beijing Labor Protection Science Research Institute, Guangdong Power Grid Corporation Electric Power Research Institute, Shantou City Occupational Disease Prevention and Control Institute. Drafters of this section. Chen Qingsong, Huang Hanlin, Li Tao, Xu Guoyong, Sun Chengxun, Chen Tao, Zhang Danying, Zhang Wei, Xiao Bin, Yan Hua, Du Wei Jia, Dong Xuemei, Wang Sheng, Wang Yanrang, Zhao Rong, Tang Shichuan, Yang Xiaotong, Li Li, Chen Suqiang, Zhang Hai, Yan Maosheng, Lin Yusheng, Jin Jia pure. Workplace physical factors - Part 3. 1 Hz to 100 kHz electric and magnetic fields1 ScopeThis part of GBZ /T 189 specifies the measurement method for electric and magnetic fields from 1 Hz to 100 kHz in the workplace. This section applies to workplaces and individuals of AC power transmission and transformation systems and other electrical and electronic equipment with a frequency range of 1 Hz to 100 kHz. Contact electric field and magnetic field measurements.2 Terms and definitionsThe following terms and definitions apply to this document. 2.1 Frequency frequency The number of times the current vibrates in the conductor every second, in Hertz (Hz). 2.2 Root mean square function; Frms. The electric field and/or magnetic field time-varying function F (t) is the square root of the squared mean over the specified time interval t1 to t2. It is by first seeking The square of the function, then determine the average of the square of the obtained function, and finally find the square root of the average, see equation (1). Frms= )]([ dttF Tt ...(1) In the formula. T2 -- end time in seconds (s); T1 -- start time in seconds (s); F (t) -- time-varying function of electric and magnetic fields, in units of volts per meter, ampere per meter or Tesla (V/m, A/m or T); Dt -- Total time from t1 to ti in seconds (s). 2.3 Peak value The peaks of the electric field strength, the magnetic field strength, and the magnetic induction are expressed as the maximum value of the field vector. It is based on electric or magnetic field strength or magnetic The instantaneous values of the three mutually perpendicular directions of the pass density are shown in equation (2). Vp=max[ )()()( 222 tVtVtV Zyx ] ... In the formula. Vx -- instantaneous value of x-axis electric field strength, magnetic field strength or magnetic flux density at a certain point in time, in volts per meter, ampere per meter or Tesla (V/m, A/m or T); Vy -- instantaneous value of y-axis electric field strength, magnetic field strength or magnetic flux density at a certain point in time, in volts per meter, ampere per meter or Tesla (V/m, A/m or T); Vz -- instantaneous value of z-axis electric field strength, magnetic field strength or magnetic flux density at a certain point in time, in volts per meter, ampere per meter or Tesla (V/m, A/m or T).3 measuring instruments3.1 The frequency of the instrument response should cover the frequency of the device under test. If the power frequency is measured, the measuring instrument should be able to respond to 50 Hz. Instrument range according to The contact limit of the measured frequency shall be at least 0.01 to 10 times the limit. 3.2 The instrument is preferably equipped with a three-phase sensor that responds to the rms value. Single-phase instruments and individual magnetic field meters that meet field measurements Requirements can also be used. 3.3 The instrument should indicate the applicable range of temperature and relative humidity. 3.4 The instrument is required to be calibrated periodically and the calibration results must be in accordance with the relevant calibration requirements.4 Measurement methods4.1 Site investigation Site surveys should be conducted on the workplace prior to measurement. The survey mainly includes. location, volume, frequency, power of the electromagnetic field source, Current, voltage, etc.; production process; contact workmanship system, operation mode (fixed operation or inspection operation), operation posture Potential (stand-up or sitting), contact (contact time and frequency), protection, etc. 4.2 Selection of measuring points The measurement points should be placed at representative operating points where electric and magnetic fields are present. The operator selects the specified inspection point for the inspection operation. The position closest to the electromagnetic field source during the inspection process; the operator selects its fixed operation position for the fixed position operation. Same or similar The measuring points can be sampled according to the electromagnetic field source. The same type, the same protection, the same current and voltage low-frequency electromagnetic field equipment, the number is 1-3 At least one unit shall be measured at the time of the station, at least two units shall be measured at 4 to 10 units, and at least three units shall be measured at least 10 units. Different models, protection or different current Pressed equipment should be measured separately. 4.3 Measuring height The detection of the electromagnetic field is based on the operator's operating position or inspection position, and the position of the head, chest or abdomen closest to the electromagnetic field source is measured. If it is impossible to judge, the head, chest and abdomen should be measured separately. 4.4 Measurement readings 4.4.1 On-site environmental electromagnetic fields are relatively stable, such as transformers, power distribution cabinets and transformer switches in power plants or substations, each measuring point The point is measured continuously for 3 times, each measurement time is not less than 15 s, and the rms value of the steady state is read and averaged. 4.4.2 On-site environmental electromagnetic field instability, such as resistance welding operations, should be measured at the time when the expected electric field and/or magnetic field strength is the highest, read The peak value of the electromagnetic field and the rms value of the highest time period, the measurement time is generally less than 5 minutes, and the labor contact time is less than 5 minutes. The contact time is measured, and each measurement point is continuously measured 3 times to take the maximum value. 4.5 Measurement Considerations 4.5.1 Measurement should be carried out under normal operating conditions of the electromagnetic field source. 4.5.2 In order to reduce the error, the measuring instrument should be fixed with a material bracket (such as a plastic bracket) without electrical conduction. 4.5.3 When measuring the electric field, the measurer and others should be outside the measuring probe 2.5 m away. 4.5.4 The measurement location should be relatively flat and free of unwanted objects. Objects that cannot be removed should be sized and their relative position to the probe. And the physical properties of the object and should complement the measurement of the field strength at different distances from the object. 4.5.5 The ambient temperature and relative humidity during measurement shall comply with the requirements specified by the instrument. 4.5.6 If the measuring instrument has gear setting, the test instrument should be adjusted to the highest gear position first, and then tested to avoid exceeding the instrument gear range. Causes the instrument to malfunction. 4.5.7 When assessing the 8h power frequency electric field strength contacted by the operator, it is necessary to investigate the dwell time of the operator at each working point. 4.5.8 Those who wear cardiac pacemakers or similar medical electronic devices should not be engaged in this measurement. 4.5.9 When conducting on-site measurements, the surveyor should pay attention to individual protection.5 Application of measurement results5.1 Comparison with occupational exposure maximum allowable limits The rms value of the field operating point measurement can be directly compared with the maximum allowable limit of the occupational exposure of the low frequency electric field and magnetic field of the corresponding frequency. When the low-frequency electromagnetic field in the field environment is unstable, the peak measurement result of the electromagnetic field strength should also be compared with the corresponding limit of 3 times. Comparison of 5.2 and 8h power frequency electric field occupational exposure limits The operator who is in contact with the power frequency electric field needs to calculate the job according to the measurement result combined with the dwell time of the operator at each working point. The 8h power frequency electric field strength time-weighted average of the personnel is compared with the 8h occupational exposure limit of the power frequency electric field. Such as daily contact with power frequency electric field strength And/or time is different, calculated according to the highest intensity and the longest working day. 6 Calculation of 8h time-weighted average of power frequency electric field intensity in workplace 6.1 If the time of contact with the power frequency electric field is not 8 h per day, the time-weighted average value of the power frequency electric field shall be calculated according to equation (3). E8= 0T E ... (3) In the formula. E8 -- 8h time-weighted average of power frequency electric field, in volts per meter (V/m) or kilovolts per meter (kV/m); E -- the power frequency field strength measured in the field, in volts per meter (V/m) or kilovolts per meter (kV/m); T -- contact power frequency electric field time in hours (h); T0 -- Take 8h. 6.2 If the intensity of the electric field electric field of different strengths is contacted every day, the time-weighted average value of the power frequency electric field shall be calculated according to formula (4). E8 = Ii TE T 1 ...(4) In the formula. E8 -- 8h time-weighted average of power frequency electric field, in volts per meter (V/m) or kilovolts per meter (kV/m); T0 -- take 8h; Ei -- the power frequency field strength measured in the field, in volts per meter (V/m) or kilovolts per meter (kV/m); Ti -- Time of contact with the electric field in hours (h).7 Measurement recordsThe measurement record should include the following. measurement date, measurement time, meteorological conditions (temperature, relative humidity), measurement position, ground Point (unit, mine name, workshop and specific measurement position), measurement site (head, chest or abdomen), distance between measuring point and electromagnetic field source, field Source type, current and voltage, frequency of field source, characteristics, measuring instrument model, measurement data, measuring personnel, etc. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GBZT189.3-2018_English be delivered?Answer: Upon your order, we will start to translate GBZT189.3-2018_English as soon as possible, and keep you informed of the progress. 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