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GB/T 20840.103-2020: Instrument transformers - Part 103: The use of instrument transformers for power quality measurement
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Instrument transformers - Part 103: The use of instrument transformers for power quality measurement
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GB/T 20840.103-2020
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Basic data | Standard ID | GB/T 20840.103-2020 (GB/T20840.103-2020) | | Description (Translated English) | Instrument transformers - Part 103: The use of instrument transformers for power quality measurement | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K41 | | Classification of International Standard | 29.180 | | Word Count Estimation | 78,762 | | Date of Issue | 2020-03-31 | | Date of Implementation | 2020-10-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20840.103-2020: Instrument transformers - Part 103: The use of instrument transformers for power quality measurement
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Instrument transformers--Part 103.The use of instrument transformers for power quality measurement
ICS 29.180
K41
National Standards of People's Republic of China
Transformers. Part 103.Transformers in power quality
Application in measurement
(IEC TR61869-103..2012, Instrumenttransformers-Theuseofinstrument
2020-03-31 release
2020-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Contents
Foreword Ⅴ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Essential Question 5
5 Power quality parameters according to GB/T 17626.30-2012 5
6 Influence of transformer on power quality measurement 12
7 Power Quality Test 53
Appendix A (informative appendix) The structural changes of this part compared with IEC TR61869-103..2012 59
Appendix B (informative appendix) The technical differences and causes of this part and IEC TR61869-103..2012 61
Appendix C (informative appendix) Transformers and power quality measurement --- outstanding questions 63
Appendix D (Informative Appendix) Transformer Class 66
References 69
Figure 1 Measuring chain 6
Figure 2 The effect of transformers on the overall measurement uncertainty 6
Figure 3 Example of voltage fluctuations causing flicker 8
Figure 4 The modulation process of the IEC scintillator 8
Figure 5 Example of voltage sag and swell 9
Figure 6 Example of voltage interruption 10
Figure 7 Example of voltage imbalance 10
Figure 8 Example of voltage harmonics 11
Figure 9 Voltage transformer technology frequency applicable range 13
Figure 10 Current transformer technology frequency applicable range 13
Fig. 11 Example of equivalent circuit of electromagnetic voltage/current transformer 14
Figure 12 Sectional view of a cast electromagnetic voltage transformer with a voltage range of 1kV (inclusive) to 52kV (inclusive)
Figure 13 Independent high-voltage voltage transformer structure diagram 17
Figure 14 Typical electromagnetic voltage transformer 420kV frequency response example 17
Figure 15 Example of the first resonance frequency point 18
Figure 16 Cross-sectional view of current transformer 20
Figure 17 Example of 400V frequency response of low voltage current transformer 20
Figure 18 Example of 10kV frequency response of microcrystalline alloy core coil current transformer 21
Fig. 19 Example of frequency response of low-voltage 10P5 current transformer 21
Figure 20 Example of results obtained by 245kV current transformer 23
Figure 21 Example of results obtained by 245kV current transformer. detail picture 23
Fig. 22 Example of frequency response of 110kV Permalloy core current transformer 24
Figure 23 Cross-sectional view of capacitive voltage transformer 25
Figure 24 Equivalent circuit diagram of capacitive voltage transformer operating at power frequency 25
Figure 25 Simplified Thevenin equivalent circuit of a capacitive voltage transformer without compensation reactor operating at line frequency 26
Figure 26 Simplified Thevenin equivalent circuit of the capacitive voltage transformer operating at power frequency 26
Figure 27 Complete Thevenin equivalent circuit of a capacitive voltage transformer operating at line frequency 27
Figure 28 Schematic diagram of measurement using a capacitive voltage transformer with harmonic measurement terminals 29
Figure 29 Comparison of different measurement examples with and without harmonic measurement end 29
Figure 30 The basic design of bulk crystal to produce Pockels effect 32
Figure 31 Different methods of applying voltage to the crystal 33
Figure 32 Different voltage division methods applied to the crystal 33
Figure 33 Basic design scheme of Pockels sensor 34
Figure 34 Pockels sensing unit 34 for engineering applications
Figure 35 Example of calculation result of frequency response of optical voltage transformer 35
Figure 36 Sectional and schematic diagrams of the resistor divider 36
Figure 37 Amplitude-frequency characteristic curve of MV resistor divider 37
Figure 38 Phase frequency characteristic curve of medium voltage resistor divider 37
Figure 39 Schematic of Capacitive Voltage Divider 38
Figure 40 Equivalent circuit of RC divider 40
Figure 41 Equivalent circuit of the resistance-capacitance voltage divider in equilibrium state 41
Figure 42 An example of the frequency response of a RC divider 41
Figure 43 Example of amplitude-frequency characteristics of resistance-capacitance voltage divider when the voltage is 145kV and the cable length is 150m 42
Figure 44 Measuring principle of optical current transformer 43
Figure 45 Measuring principle of optical current transformer 43
Figure 46 Example of calculation result of frequency response of optical current transformer 44
Figure 47 LPCT typical frequency response measurement example 45
Figure 48 Roche coil equivalent circuit 46
Figure 49 Schematic diagram and physical picture of Roche coil current transformer 48
Figure 50 Electrical scheme for shunt current measurement 49
Figure 51 Shunt DC application 49
Figure 52 Compensating shunt equivalent circuit 49
Figure 53 The theoretical bandwidth of the 5kA/150mV shunt 50
Figure 54 Hall Effect Sensor 51
Figure 55 Hall Effect Sensor 52
Figure 56 Hall Effect Sensor 52
Figure 57 Test circuit for voltage transformer frequency response 54
Figure 58 Test circuit for voltage transformer frequency response 55
Figure 59 Test circuit for frequency response of current transformer 55
Figure 60 Test circuit for the frequency response of the current transformer 56
Figure 61 Digital output electronic current transformer test device 57
Figure 62 Test device for analog output of electronic current transformer 58
Figure C.1 Example of "unrealistic descent" 65
Table 1 Power quality disturbance in GB/T 17626.30-2012 and its measurement interval 7
Table 2 Influence of transformer parameters on power quality measurement 12
Table 3 The main components of the electromagnetic voltage transformer with a voltage range of 1kV (inclusive) ~ 52kV (inclusive) 15
Table 4 The influence of electromagnetic voltage transformers with a voltage range of 1kV (inclusive) to 52kV (inclusive) on the measurement of power quality parameters 16
Table 5 Measurement of power quality parameters of electromagnetic voltage transformers with a voltage range of 52kV (excluding) to 1100kV (inclusive)
Influence 18
Table 6 The main components of the electromagnetic current transformer with a voltage range of 1kV (inclusive) ~ 52kV (inclusive) 19
Table 7 The influence of electromagnetic current transformers with a voltage range of 1 kV (inclusive) to 52 kV (inclusive) on the measurement of power quality parameters 21
Table 8 The main components of the electromagnetic current transformer with a voltage range of 52kV (excluding) to 1100kV (inclusive) 22
Table 9 Measurement of power quality parameters of electromagnetic current transformers with a voltage range of 52kV (excluding) to 1100kV (inclusive)
Impact 24
Table 10 Influence of capacitive voltage transformer on power quality parameter measurement 28
Table 11 Influence of capacitive voltage transformer with harmonic measurement terminal on power quality parameter measurement 30
Table 12 Accuracy level of power measurement 30
Table 13 Accuracy level of power quality measurement 31
Table 14 Influence of optical voltage transformer on power quality parameter measurement 35
Table 15 Influence of medium voltage resistance voltage divider on power quality parameter measurement 38
Table 16 Influence of capacitive voltage divider on power quality parameter measurement 39
Table 17 Influence of resistance-capacitance voltage divider on power quality parameter measurement 42
Table 18 Influence of optical current transformer on power quality parameter measurement 44
Table 19 Main components of low power current transformer 45
Table 20 Influence of low-power current transformers on power quality parameter measurement 46
Table 21 Main components of Roche sensors 48
Table 22 Influence of Rogowski coil current transformer on power quality parameter measurement 48
Table 23 Influence of shunt on power quality parameter measurement 50
Table 24 The effect of Hall effect sensors on the measurement of power quality parameters 53
Table 25 Requirements for power quality parameters on voltage and current transformers 53
Table 26 Test current and voltage of common accuracy level 56
Table 27 Test current and voltage for special accuracy level 56
Table A.1 Comparison between this part and IEC TR61869-103..2012 chapter number 59
Table A.2 Comparison between this part and IEC TR61869-103..2012 drawings, table numbers 60
Table B.1 The technical differences between this part and IEC TR61869-103..2012 and their causes 61
Table D.1 Examples of recommended main requirements for accuracy testing Table 66
Foreword
GB/T 20840 "Transformer" is divided into the following parts.
--- Part 1.General technical requirements;
--- Part 2.Supplementary technical requirements for current transformers;
--- Part 3.Supplementary technical requirements for electromagnetic voltage transformers;
--- Part 4.Supplementary technical requirements for combined transformers;
--- Part 5.Supplementary technical requirements for capacitive voltage transformers;
--- Part 6.Supplementary general technical requirements for low power transformers;
--- Part 7.Electronic Voltage Transformer;
--- Part 8.Electronic Current Transformer;
--- Part 9.Digital Interface of Transformer;
--- Part 102.Ferromagnetic resonance in substations with electromagnetic voltage transformers;
--- Part 103.Application of transformers in power quality measurement.
This part is Part 103 of GB/T 20840.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part uses the redrafting method to modify the use of IEC TR61869-103..2012 "Transformer Transformer in Power Quality Measurement
application".
This part is structurally adjusted compared to IEC TR61869-103..2012.Appendix A lists this part and IEC TR61869-
A comparative list of chapters, articles, figures, and table numbers in 103..2012.
There are technical differences between this part and IEC TR61869-103..2012, and the terms involved in these differences have been adopted on the outside pages
The vertical single line (|) in the marginal position is marked. Appendix B gives a list of corresponding technical differences and their causes.
This section also made the following editorial changes.
--- Modified the standard name;
--- Chapter 1 adds notes on the high voltage, medium voltage and low voltage voltage ranges;
--- 5.2 replaced "IEC /TC38" with "Transformer Professional";
--- D.1 Note content has been adjusted according to the actual situation in my country;
--- D.2 changed "10/12cycles" to "10 cycles";
--- Add IEC 60050-311..2001 and IEC 60050-604.1987 in the reference;
--- The formulas of the full text are numbered uniformly.
This part is proposed by China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Transformer Standardization Technical Committee (SAC/TC222).
This section was drafted by. State Grid Shaanxi Electric Power Research Institute, Shenyang Transformer Research Institute Co., Ltd., Yunnan Power
Network Co., Ltd. Electric Power Research Institute, China Electric Power Research Institute Co., Ltd., Dalian First Transformer Co., Ltd., Dalian
North Transformer Group Co., Ltd., Jiangsu Kexing Electric Co., Ltd., Zhejiang Skyline Transformer Co., Ltd., Jiangsu Jingjiang Transformer Co., Ltd. have
Limited company, Chongqing Shancheng Electric Appliance Factory Co., Ltd., State Grid Jilin Electric Power Co., Ltd. Electric Power Research Institute, State Grid Jiangxi Electric Power Co., Ltd.
Division Electric Power Research Institute, State Grid Shanghai Electric Power Company Electric Power Research Institute.
The main drafters of this section. Deng Jun, Chen Yixiu, Zhang Xianzhong, Li Yunge, Zhang Xiaoqing, Liu Hongwen, Tong Yue, Sha Yuzhou, Zhao Guoqing, Yang Xiaoxi,
Huang Hua, Yang Feng, Tang Fuxin, Xiong Jiangyong, Xu Wen, Li Taochang, Wang Jiyuan, Cai Qiang, Zhao Shixiang, Yan Nianping, Chen Wenzhong.
Transformers. Part 103.Transformers in power quality
Application in measurement
1 Scope
This part of GB/T 20840 gives the definition and description of power quality parameters, the effect of transformers on power quality measurement and power
Quality testing guidance.
This section applies to electromagnetic and electronic transformers working in power frequency AC power (power supply) systems, which have analog or digital
Power output, power supply gas measuring instrument, used for power quality parameter measurement and result evaluation.
This section is intended to provide guidance for the measurement of power quality parameters using high-voltage transformers.
The power quality parameters in this part include grid frequency, power supply voltage and current amplitude, flicker, power supply voltage sag and swell, voltage interruption,
Transient voltage, unbalanced supply voltage, voltage current harmonics and interharmonics, signal voltage (superimposed) on the supply voltage and fast voltage
Variety.
Note. The voltage ranges of the low-voltage, medium-voltage and high-voltage electromagnetic transformers mentioned in this section are. the low-voltage is less than 1kV AC voltage level
The voltage is 1kV and above, 52kV and below AC voltage level, and the high voltage is above 52kV AC voltage level.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 6592-2010 Electrical and electronic measuring equipment performance representation (IEC 60359..2001, IDT)
GB/T 17626.7-2017 Electromagnetic compatibility test and measurement technology Power system and connected equipment harmonic and inter-harmonic measurement and
Guidelines for measuring instruments (IEC 61000-4-7..2009, IDT)
GB/T 17626.15-2011 Electromagnetic compatibility test and measurement technology scintillator function and design specifications (IEC 61000-4-
15..2003, IDT)
GB/T 17626.30-2012 Electromagnetic compatibility test and measurement technology power quality measurement method (IEC 61000-4-30..2008,
IDT)
GB/T 18039.3-2017 Compatible water for low-frequency conducted disturbance and signal transmission of public low-voltage power supply system in electromagnetic compatibility environment
Ping (IEC 61000-2-2..2002, IDT)
GB /Z 18039.5-2003 Electromagnetic compatibility environment Electromagnetic environment of low-frequency conduction disturbance and signal transmission of public power supply system
(IEC 61000-2-1..1990, IDT)
GB/T 18216.12-2010 AC 1000V and DC 1500V and below low-voltage power distribution system electrical safety protection measures
Test, measurement or monitoring equipment. Part 12.Performance measurement and monitoring device (PMD) (IEC 61557-12..2007, IDT)
GB/T 20840.8-2007 Transformers Part 8.Electronic current transformers (IEC 60044-8..2002, MOD)
EN50160..2007 Voltage characteristics of public distribution system power supply (Voltagecharacteristicsofelectricitysuppliedby
publicdistributionnetworks)
3 Terms and definitions
The following terms and definitions apply to this document.
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