GB/T 30137-2024 PDF EnglishUS$440.00 · In stock · Download in 9 seconds
GB/T 30137-2024: Power quality - Voltage swell, voltage dips and short interruptions Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 30137: Historical versions
Similar standardsGB/T 30137-2024: Power quality - Voltage swell, voltage dips and short interruptions---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT30137-2024GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.020 CCS K 04 Replacing GB/T 30137-2013 Power quality - Voltage swell, voltage dips and short interruptions Issued on. DECEMBER 31, 2024 Implemented on. APRIL 01, 2025 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 6 4 Statistics and indexes of voltage swells, voltage dips and short interruptions... 10 5 Detection of voltage swells, voltage dips and short interruptions... 14 6 Monitoring of voltage swells, voltage dips and short interruptions... 17 7 Assessment of voltage swells, voltage dips and short interruptions... 19 Appendix A (Informative) Voltage tolerance curve... 21 Appendix B (Informative) Point-on-wave of voltage dip initiation and phase-angle jump detection... 23 Appendix C (Informative) Critical distance and dip area... 25 Bibliography... 311 ScopeThis document specifies the indexes and statistical, test, monitoring and assessment methods for voltage swell, voltage dip and short interruption in the electric power system. This document is applicable to 50 Hz AC power systems.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 19862, General requirements for monitoring equipments of power quality GB/T 17626.30, Electromagnetic compatibility - Testing and measurement techniques - Part 30.Power quality measurement methods3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 voltage swell A phenomenon that the r.m.s. voltage at a certain point in the power system suddenly rises to 1.1 p.u. ~ 1.8 p.u. and returns to normal after a short period of 10 ms ~ 1 min. 3.2 magnitude of voltage swell The maximum value of the r.m.s. voltage during a voltage swell. 3.3 voltage dip; voltage sag A phenomenon that the r.m.s. voltage at a certain point in the power system suddenly drops to 0.1 p.u ~ 0.9 p.u. and returns to normal after a short period of 10 ms ~ 1 min. 3.4 short interruption A phenomenon that the r.m.s. voltage at a certain point in the power system suddenly drops to below 0.1 p.u. and returns to normal after a short period of 10 ms ~ 1 min. 3.5 threshold The voltage threshold value used to determine the start and end of a voltage swell, voltage dip or short interruption. 3.6 duration The time taken from the start to the end of a voltage swell, voltage dip or short interruption event. 3.7 phase-angle jump The sudden change in the relative position of the voltage and/or current waveform on the time axis before and after a voltage swell or voltage dip event occurs, expressed in degrees or radians. 3.8 frequency; occurrence frequency The number of voltage swells, voltage dips, or short interruptions that occur within a specified period of time. 3.9 r.m.s. voltage refreshed each half-cycle Urms(1/2) The measured value of r.m.s. voltage whose measurement data window is one cycle, starting from the zero crossing point of the fundamental wave and updated every half cycle. 3.10 r.m.s. voltage refreshed each cycle Urms(1) The measured value of r.m.s. voltage whose measurement data window is one cycle, which is updated once every cycle. 3.11 residual voltage Ures The minimum value of the r.m.s. voltage during a voltage dip or short interruption. 3.12 depth of voltage dip The difference between the reference voltage and the residual voltage. Note. Reference voltage usually refers to nominal voltage or sliding reference voltage, the former of which generally refers to the nominal voltage of the system. If, according to the agreement between the supplier and the customer, the voltage applied to the terminal is different from the nominal voltage, this voltage is the nominal supply voltage. 3.13 system average r.m.s. frequency index SARFI index The average number of voltage swell, voltage dip or short interruption events in a system or a single measuring point, which is the main quantitative index used to reflect the frequency of voltage swells, voltage dips or short interruptions in a system or a single measuring point within a specific time. 3.14 declared input voltage Udin The voltage value determined by dividing the system nominal voltage by the voltage transformer ratio. 3.15 sliding reference voltage Usr The average voltage magnitude within a specific time period, which is used to indicate the voltage before a voltage change event (such as voltage dip, voltage swell, and rapid voltage change). [Source. GB/T 17626.30-2023, 3.29, modified] 3.16 hysteresis voltage The difference between the start voltage threshold and the end voltage threshold. Note 1.The definition of hysteresis in this document is related to power quality measurement parameters. This definition is different from the definition in IEC 60050, which is related to the core saturation. Note 2.The purpose of introducing the hysteresis term in power quality measurement is to avoid multiple counting of events when the magnitude of the parameter oscillates around the threshold range.4 Statistics and indexes of voltage swells, voltage dips andshort interruptions 4.1 Statistics of voltage swells, voltage dips and short interruptions The voltage swell, voltage dip and short interruption statistics table, which can intuitively reflect the occurrence of voltage swells, voltage dips and short interruptions at the monitoring point within a period of time, mainly counts the number of events with different magnitudes and durations. If voltage swell and voltage dip or short interruption occur simultaneously within 1 minute after the start of the event, they shall be counted in Table 1 and Table 2, respectively. Table 1 shows the number of voltage swell events corresponding to the corresponding magnitude and duration of voltage swell; Table 2 shows the number of voltage dips or short interruptions corresponding to the corresponding residual voltage and duration. 4.2 Indexes of voltage swells, voltage dips and short interruptions 4.2.2 Frequency index The frequency index reflects the frequency of voltage swells, voltage dips or short interruptions. Frequency statistics and evaluation can be carried out through monitoring or other means, and the general statistical cycle is 1 year. The event frequency of a node or the total event frequency of a regional power grid can be counted. 4.2.3 Severity index The severity index reflects the impact of voltage swells, voltage dips or short interruptions on equipment and users. The event severity index is calculated in combination with the equipment tolerance curve. The severity index Se of a single voltage swell event is defined as shown in Formula (3), and the severity index Se of a single voltage dip or short interruption event is defined as shown in Formula (4). 4.2.4 Indexes of voltage swell/dip The energy index reflects the degree of energy enhancement/loss caused by swell/dip events.5 Detection of voltage swells, voltage dips and short interruptions5.1 Detection algorithm of r.m.s. voltage 5.1.1 r.m.s. voltage refreshed each half-cycle [Urms(1/2)] The calculation method of Urms(1/2) is shown in Formula (6). 5.1.2 r.m.s. voltage refreshed each cycle [Urms(1)] The calculation method of Urms(1) is shown in Formula (7). 5.2 Event detection 5.2.1 Threshold setting The threshold for voltage swell is generally set at 1.1 p.u.; the threshold for voltage dip is generally set at 0.9 p.u.; the threshold for short interruption is generally set at 0.1 p.u. 5.2.2 Determination of voltage swell In a single-phase system, when Urms(1/2) or Urms(1) is higher than the swell threshold, the voltage swell event begins; when Urms(1/2) or Urms(1) is equal to or lower than the difference between the voltage swell threshold and the hysteresis voltage, the voltage swell ends. In a multi-phase system, when Urms(1/2) or Urms(1) of any phase is higher than the swell threshold, the voltage swell begins; when Urms(1/2) or Urms(1) of all phases is equal to or lower than the difference between the swell threshold and the hysteresis voltage, the voltage swell ends. 5.2.3 Determination of voltage dip In a single-phase system, when Urms(1/2) or Urms(1) is lower than the dip threshold, the voltage dip event begins; when Urms(1/2) or Urms(1) is equal to or higher than the sum of the dip threshold and the hysteresis voltage, the voltage dip ends. In a multi-phase system, when Urms(1/2) or Urms(1) of any phase is lower than the dip threshold, the voltage dip begins; when Urms(1/2) or Urms(1) of all phases is equal to or higher than the sum of the dip threshold and the hysteresis voltage, the voltage dip ends. 5.2.4 Determination of short interruption In a single-phase system, when Urms(1/2) or Urms(1) is lower than the short interruption threshold, the short interruption event begins; when Urms(1/2) or Urms(1) is equal to or higher than the sum of the short interruption threshold and the hysteresis voltage, the short interruption ends. In a multi-phase system, when Urms(1/2) or Urms(1) of any phase is lower than the short interruption threshold, the short interruption begins; when Urms(1/2) or Urms(1) of all phases is equal to or higher than the sum of the short interruption threshold and the hysteresis voltage, the short interruption ends. 5.3 Method for selecting values of characteristic parameters 5.3.2 Voltage dip The characteristic parameters of voltage dip include residual voltage (Ures) or depth, duration, and phase-angle jump; the residual voltage is the lowest Urms value measured on any channel during the dip. The start time of the voltage dip shall be the end time of the Urms measurement data window triggering the event channel; the end time of the voltage dip shall be the end time of the Urms measurement data window terminating the event channel. Urms is determined by the sum of the threshold and the hysteresis voltage. The duration of a voltage dip is the time difference from the start to the end of the voltage dip.6 Monitoring of voltage swells, voltage dips and short interruptions6.1 Classification of monitoring instruments Monitoring instruments are divided into two categories according to their performance, which are defined as follows. Grade A performance – meeting the Grade A measurement method and uncertainty requirements in GB/T 17626.30, capable of accurately measuring the magnitude, duration, phase-angle jump and other characteristic parameters of voltage swell, voltage dip and short interruption. Each measurement channel can measure the r.m.s. voltage refreshed each half-cycle [Urms(1/2)]. This grade of instrument is suitable for occasions where precise measurements are required, such as standard compliance inspection, dispute resolution, power quality contract arbitration, etc. Grade S performance – meeting the Grade S measurement method and uncertainty requirements in GB/T 17626.30, and capable of measuring characteristic parameters such as the magnitude and duration of voltage swells, voltage dips and short interruptions. Each measurement channel can measure the r.m.s. voltage refreshed each half-cycle [Urms(1/2)] or the r.m.s. voltage refreshed each cycle [Urms(1)]. This grade of instrument is suitable for power quality survey statistics, troubleshooting and other applications that do not require high accuracy. An appropriate instrument performance grade shall be selected according to the specific application. 6.2 Technical requirements for monitoring instruments 6.2.1 Basic functions 6.2.1.1 Monitoring function The instrument shall be able to perform real-time monitoring of voltage swell, voltage dip or short interruption events through voltage measurement, and obtain characteristic parameters such as magnitude of voltage swell, residual voltage, and duration. 6.2.1.2 Waveform recording function The event waveform record of the instrument shall be able to restore the process of voltage instantaneous waveform changes within the recording time period, and shall include waveforms of at least 5 cycles before the event and at least 20 cycles after the event. Instruments of Grade A performance have the function of recording event waveforms with a recording length of not less than 1 s, and instruments of Grade S performance have the function of recording event waveforms with a recording length of not less than 0.5 s. 6.2.1.3 Other functions The display, communication interface, authority management, parameter configuration, timing, storage and statistical functions of the instrument shall meet the requirements of GB/T 19862 and have the function of threshold setting. 6.2.2 Instrument accuracy The voltage magnitude measurement error of instruments of Grade A performance shall not exceed ±0.2% of the declared input voltage; the voltage magnitude measurement error of instruments of Grade A shall not exceed ±1.0% of the declared input voltage. The duration measurement error of instruments of Grade A performance shall not exceed ±1 cycle; the duration measurement error of instruments of Grade S performance shall not exceed ±2 cycles.7 Assessment of voltage swells, voltage dips and short interruptions7.1 General The assessment of voltage swell, voltage dip and short interruption is divided into single measuring point index and system index assessment. Determine the assessment object and scope based on the source and purpose of the assessment task; analyze the index results; form an assessment report. If necessary, corresponding improvement measures shall be suggested. 7.2 Single-measuring point index assessment The single-measuring point indexes are used to characterize the overall characteristics of voltage swells, voltage dips or short interruptions that occur at a specific node within a certain period of time (typically one year), including SARFI index, severity index, frequency index and energy index, and are assessed according to the calculation method of the recommended indexes in 4.2.Single-measuring point indexes can be used to assess the compatibility between sensitive equipment and power supply, can also help select the installation site for sensitive loads, and can provide local users with the voltage quality status of the node. In actual work, accurate identification of the dip area can also provide a reference for selecting the location of sensitive loads. The calculation method of the dip area is shown in Appendix C. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 30137-2024 be delivered?Answer: The full copy PDF of English version of GB/T 30137-2024 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 30137-2024_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 30137-2024_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 30137-2024 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 30137-2024?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 30137-2024 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 30137-2024?A step-by-step guide to download PDF of GB/T 30137-2024_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 30137-2024". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
