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Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email. GBZ17625.14-2017: Electromagnetic compatibility -- Limits -- Assessment of emission limits for harmonics, inter-harmonics, voltage fluctuations and unbalance for the connection of disturbing installations to LV power systems Status: Valid
Basic dataStandard ID: GB/Z 17625.14-2017 (GB/Z17625.14-2017)Description (Translated English): Electromagnetic compatibility -- Limits -- Assessment of emission limits for harmonics, inter-harmonics, voltage fluctuations and unbalance for the connection of disturbing installations to LV power systems Sector / Industry: National Standard Classification of Chinese Standard: L06 Classification of International Standard: 33.100.10 Word Count Estimation: 82,860 Date of Issue: 2017-11-01 Date of Implementation: 2018-05-01 Regulation (derived from): National Standard Announcement 2017 No. 29 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China GBZ17625.14-2017: Electromagnetic compatibility -- Limits -- Assessment of emission limits for harmonics, inter-harmonics, voltage fluctuations and unbalance for the connection of disturbing installations to LV power systems---This is a DRAFT version for illustration, not a final translation. 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GB /Z 17625.14-2017 Electromagnetic compatibility - Limits - Assessment of emission limits for harmonics, inter-harmonics, voltage fluctuations and unbalance for the connection of disturbing installations to LV power systems ICS 33.100.10 L06 National Standardization Guiding Technical Document of the People's Republic of China Electromagnetic compatibility limit disturbance device connected to low voltage Evaluation of emission limits for power system harmonics, interharmonics, voltage fluctuations and unbalance 2017-11-01 released 2018-05-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Issued by China National Standardization Administration Table of contentsPreface Ⅲ 1 Scope 1 2 Normative references 2 3 Terms and definitions 3 4 Basic EMC concepts 8 4.1 Overview 8 4.2 Compatibility level 8 4.2.1 Overview 8 4.2.2 Harmonics 9 4.2.3 Interharmonics 9 4.2.4 Voltage fluctuation 10 4.2.5 Unbalance 10 4.3 Planning level 10 4.3.1 Indicator value of planning level 10 4.3.2 Evaluation procedures based on planning level 10 4.4 EMC concept description 11 4.5 Emission level 12 5 General principles 13 5.1 Overview 13 5.2 Stage 1.Simplified assessment of harassment emissions 13 5.3 Stage 2.Emission limits related to actual system characteristics 13 5.4 Stage 3.Conditionally accept higher emission levels 13 5.5 Liability 14 6 General guidelines for the assessment of emission levels 14 6.1 Evaluation points 14 6.2 Concept of emission levels 15 6.3 Operating conditions 15 6.4 System impedance characteristics 15 7 General Superposition Law 16 7.1 Overview 16 7.2 Harmonics 16 7.3 Flicker and rapid voltage changes 16 7.4 Voltage imbalance 17 8 Harmonic emission limits of distortion devices in low-voltage systems 17 8.1 Phase 1.Simplified assessment of harassment emissions 17 8.2 Stage 2.Emission limits related to actual system characteristics 18 8.2.1 Overview 18 8.2.2 Distribution of total emission value among user devices 18 8.2.3 Single emission limit 19 8.2.4 Alternatives to Phase 2 20 8.3 Stage 3.Conditionally accept higher emission levels 20 8.4 Emission limits of interharmonics 21 9 Voltage fluctuation emission limits for devices in low-voltage systems 21 9.1 Stage 1.Simplified assessment of harassment emissions 21 9.2 Stage 2.Emission limits related to actual system characteristics 21 9.2.1 Overview 21 9.2.2 Distribution of total emission value among user devices 22 9.2.3 Single emission limit 22 9.3 Stage 3.Conditionally accept higher emission levels 23 9.4 Rapid voltage changes 23 9.4.1 General considerations 23 9.4.2 Emission limits 24 10 Unbalanced emission limits for unbalanced devices in low-voltage systems 24 10.1 Overview 24 10.2 Stage 1.Simplified assessment of harassment emissions 24 10.3 Stage 2.Emission limits related to actual system characteristics 24 10.3.1 Overview 24 10.3.2 Distribution of the total emission value among unbalanced sources 25 10.3.3 Single emission limit 25 10.4 Stage 3.Conditionally accept higher emission levels 27 11 Evaluation block diagram 27 Appendix A (informative appendix) Calculation examples of general methods for deriving specific types of low-voltage power grid limits 31 Appendix B (informative appendix) Calculation example of general calculation method of emission limit of specific device 41 Appendix C (informative appendix) Phase 2 harmonic emission limits 45 Appendix D (informative appendix) Calculating the attenuation coefficient of harmonics and unbalance 55 Appendix E (informative appendix) Calculation example of the third stage harmonic emission limit allocation method 64 Appendix F (informative appendix) Application examples of the methods described in Appendix E 68 Appendix G (informative appendix) List of main letter symbols, subscripts and symbols 72 Reference 75 Electromagnetic compatibility limit disturbance device connected to low voltage Power system harmonics, interharmonics, voltage fluctuations and Unbalanced emission limit assessment1 ScopeThe principle guide provided in this part of "Electromagnetic Compatibility Limits" can be used as a guide for determining the requirements for the connection of disturbance devices to low-voltage public power systems. basis. For this section, disturbance devices refer to disturbances (including harmonics and/or interharmonics, voltage flicker and/or rapid voltage changes, and/or Or voltage imbalance) device (load or power generation device). The main purpose of this part is to provide the engineering practice of the system operator or owner Guidance in order to provide sufficient quality of service for all connected user devices. In terms of devices, this section is not intended to replace the emission limit standards for equipment. Note 1.The low voltage in this section refers to Un≤1kV. This part discusses the allocation of system capacity for absorbing harassment. It does not discuss how to mitigate harassment, nor does it involve how to increase system capacity. This section only applies to devices connected to low-voltage public power systems that supply (or may supply) other low-voltage loads or devices. This part Mainly for large-scale installations exceeding a certain minimum capacity. The minimum capacity (Smin) is specified by the system operator or owner according to the system characteristics. Note 2.Due to the minimum capacity limitation, this section usually does not apply to residential user devices. The purpose of this section is not to specify emission limits for a single device connected to a low-voltage system. Existing applicable IEC product standards Specifies emission limits for low-voltage equipment. These standards determine emission limits based on the assumption that disturbances are generated in devices connected to the power supply system The number, type and purpose of the equipment are based on the reference impedance given in IEC 60725, which is considered a representative small house Device power impedance. This assumption may not apply to large low-voltage installations, therefore, this section provides a method for determining emission limits for large installations. Note 3.Compliance with the emission limit determined by the method in this section does not exempt the obligation to comply with the emission limit requirements of the relevant equipment in the relevant national or regional regulations. This section deals with low-frequency conducted disturbances generated by low-voltage devices. The harassment considered is. ---Harmonics and interharmonics; ---Flicker and rapid voltage changes; ---Unbalance (negative sequence component). Since the guidelines outlined in this section are based on some simplified assumptions, there is no guarantee that this method will always provide The best solution should be judged from the engineering perspective and used flexibly and reasonably when using the given evaluation procedure in whole or in part. The system operator or owner is responsible for specifying the requirements for the connection of the harassment device to the system. The harassment device should be understood as the whole of the user Device (i.e. including harassment and non-harassment part). This section provides recommended procedures for establishing emission limits for large low-voltage installations. To enable any grid operator or owner to fully apply this section For points, experts may need to obtain applicable factors for specific types of low-voltage operating grids. Note 4.In some cases, simplifying the emission limits by drawing a set of tables for all low-voltage power grids may make the limits too conservative. The main content of this section gives general procedures for the distribution of harmonics, voltage fluctuations and unbalanced emission limits for large installations connected to low-voltage power grids. The appendix to this section gives additional information, in particular. ---Appendix A gives examples of power distribution experts or technical application in accordance with national regulations, so as to use general methods according to specific network The network characteristics derive its own limits. ---Appendix B gives examples of application of specific devices connected by distribution operators based on the local parameters of the low-voltage power grid. 4.2.4 Voltage fluctuation IEC 61000-4-15 provides two quantities for characterizing the severity of flicker. Pst ("st" means "short-term". a value is obtained every 10 minutes) and Plt ("lt" means "long-term". a value is obtained every 2h). Flicker-related voltage quality standards are generally expressed by Pst and/or Plt, and Plt is usually According to a set of 12 consecutive Pst values, as shown in equation (2). In this section, it is also assumed that the flicker meter and related severity factors have been modified to make it suitable for the type of incandescent lamp in use (e.g., 120V or 230V), so that regardless of the voltage of the incandescent lamp, the flicker limit remains unchanged. This is very important, because with 230V Compared with incandescent lamps, 120V incandescent lamps are less sensitive to voltage fluctuations, and 100V incandescent lamps are less sensitive to voltage fluctuations. Under normal circumstances, the rapid voltage change value is limited to 3% of the nominal supply voltage of the low-voltage system. However, occasionally on the public power supply network There will be more than 3% voltage change (see IEC 61000-2-2). 4.2.5 Unbalance The compatibility level of voltage unbalance of low-voltage system given in IEC 61000-2-2 is that the ratio of negative sequence component to positive sequence component is not more than 2%. In some areas, especially when large single-phase loads are connected, the compatibility level may be as high as 3%. Note 1.It is also worth noting that the above compatibility level refers to the steady-state thermal effect of voltage imbalance. Higher values may be recorded in the short term (e.g. short circuit 100% voltage imbalance), but these short-term high imbalances do not necessarily have a significant heating effect on the equipment. Note 2.The requirements for unbalance protection in the device should consider the compatibility level and instantaneous unbalance effects. Note 3.The 3% compatibility level generally occurs on low-voltage and medium-voltage networks that supply power to smaller devices through single-phase (or interphase) connections. 4.3 Planning level 4.3.1 Indicator value of planning level These values can be used for planning purposes to assess the impact of all disturbing devices on the power supply system. System operators or owners for all systems The voltage level determines the relevant planning levels and regards these planning levels as its internal quality targets. The planning level is equal to or lower than the compatibility level, and coordination of disturbance levels between different voltage levels should be allowed. Consider voltage characteristics (See note below), resonance, etc. It may be reasonable to set some margin between the planning level and the compatibility level. The level of planning depends on the system Structure and environment, depending on the situation, can not give a fixed value (see 4.2 for compatibility level). Note. In some countries, there are voltage characteristics of quasi-guaranteed level (for example, 66kV). These characteristics should be coordinated with the planning level. When considering these, Consider the nature of the system. The remainder of this section outlines the procedures for using these planning levels to determine emission limits for individual user disturbance devices. 4.3.2 Evaluation procedures based on planning level The measurement method used is the Type A measurement method defined in IEC 61000-4-30.The number marked according to the standard should be removed from the evaluation according to. For the sake of clarity, if labeled data is available, only valid (unlabeled) data is used to calculate the percentile used for the calculation of the indicators defined below. For rapid voltage changes, there is no standardized measurement method. Therefore, it is recommended that the evaluation procedure used in this case be based on the measured average The change of root voltage value, and only consider the power frequency component with the transient component removed. In fact, the shortest possible multi-period window should be used to avoid Avoid artificially smoothing out the expected rms fundamental frequency voltage change. For each type of harassment, the smallest measurement period is a week of normal business activities. The monitoring cycle should include the expected maximum Disturb some parts of the horizontal period. One or more of the following indicators can be used to compare the actual harassment level with the planned level. More than one pointer may be required for the planning level In order to evaluate the impact of higher emission levels allowed in a shorter time (for example, burst or start state). For harmonic voltage, the indicators are as follows. ---Uh,sh (10min "short" period single harmonic root mean square value) weekly 95% probability value should not exceed the planned level. ---Uh, vs (3s "very short" period single harmonic component root mean square value) maximum daily 99% probability value should not exceed the planning level multiplied by Equation (1) gives the coefficient khvs involving the extremely short-term effects of harmonics. Note 1.Depending on the application, it is usually measured up to the 40th or 50th harmonic. For flicker, the indices Pst and Plt are as follows. ---The weekly 95% probability value of Pst should not exceed the planned level. --- The weekly 99% probability value of Pst should not exceed the planned level multiplied by the system operator or owner according to the system and load characteristics. Coefficient (for example. 1~1.5). ---The weekly 95% probability value of Plt should not exceed the planned level. Note 2.Possible abnormal results should be excluded (for example, due to voltage sags or other transients). It is also recommended to use a sliding window to change each new Pst value Incorporate into the revised Plt calculation, that is, replace the oldest Pst measurement result with the latest Pst value every 10 min. The proposed Plt calculation program 144 Plt values are generated every day. In some cases, it may be necessary to post-process the Pst output result of the flicker meter. For rapid voltage changes, because of its low frequency of occurrence, statistical indicators are not considered. Therefore, the maximum value of the rapid voltage change is not Should exceed the planned level. However, high values caused by abnormal disturbances (such as malfunctions or abnormal switching operations) should be excluded from the evaluation. For voltage imbalance, the indicators are as follows. ---ush (10min "short" period of fundamental frequency voltage imbalance) weekly 95% probability value should not exceed the planned level. --- The daily 99% probability value of uvs (3s "very short" period fundamental frequency voltage imbalance) should not exceed the planned level multiplied by the system operation The coefficient specified by the business or owner based on the characteristics of the system and load and its protection devices (for example. 1.25~2). Note 3.According to IEC 61000-4-30, when evaluating voltage unbalance, only the positive sequence and negative sequence components of the fundamental frequency are used (harmonics should be removed because some negative sequence Harmonics will change the measurement results). 4.4 EMC concept description The basic concepts of planning level and compatibility level are shown in Figure 1 and Figure 2.They are designed to emphasize important relationships between basic variables. In the entire power system, a certain level of interference will inevitably occur on certain occasions. Therefore, the disturbance level and immunity level distribution There will be a risk of overlap (see Figure 1). Usually the planning level is equal to or lower than the compatibility level; the planning level is determined by the system operator or Owner's regulations. The immunity test level is determined according to relevant standards or the result of negotiation between the manufacturer and the user. As shown in Figure 2, the probability distribution of the disturbance level and immunity level at any site is usually greater than that of the entire power system. The cloth is so narrow that there is little or no overlap in the distribution of disturbance levels and immunity levels in most locations. Therefore, usually interfere It is not a major concern, and it is expected that the equipment will operate in compliance with the requirements. Therefore, compared with the situation shown in Figure 1, it is more likely to satisfy Electromagnetic compatibility. 4.5 Emission level The coordination method proposed in this section relies on the single emission level derived from the planning level. Therefore, in accordance with the emission limit and planned water When evaluating actual measurement results, the same indicators should be used. One or more of the following indicators can be used to compare actual emission levels with user emission limits. To evaluate shorter time (e.g. The impact of higher emission levels allowed within the dynamic state may require more than one indicator. For harmonic emission, the indicators are as follows. ---Uh,sh (or Ih,sh) (10min "short" period single harmonic root mean square value) weekly 95% probability value should not exceed the emission limit EUhi (or EIhi). ---Uh, vs (or Ih, vs) (3s "very short" period single harmonic component root mean square value) daily 99% probability value should not exceed the emission limit Multiply the coefficient khvs given by equation (1). For flicker emission, the indicators are as follows. ---The weekly 95% probability value of Pst should not exceed the emission limit EPsti. --- The weekly 99% probability value of Pst should not exceed the emission limit EPsti multiplied by the system operator or owner according to the system and load characteristics. Set coefficient (for example, 1~1.5). ---The weekly 95% probability value of Plt should not exceed the emission limit EPlti. For rapid voltage changes, because of its low frequency of occurrence, statistical indicators are not considered. Therefore, the maximum value (including Including frequency) should not exceed the emission limit. However, abnormal disturbances (such as malfunctions or abnormal switch operations) should be excluded from the assessment The high value. For unbalanced launch, the indicators are as follows. ---u2sh or i2sh (10min "short" period of fundamental frequency voltage or current imbalance) weekly 95% probability value should not exceed the launch Limit Eu2i (or Ei2i); ---u2vs or i2vs (3s "very short" period of fundamental frequency voltage or current imbalance) 99% probability value should not exceed the emission limit The value is multiplied by the coefficient specified by the system operator or owner accordin......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GBZ17625.14-2017_English be delivered?Answer: Upon your order, we will start to translate GBZ17625.14-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 5 ~ 8 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GBZ17625.14-2017_English with my colleagues?Answer: Yes. 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