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GB 20840.2-2014 English PDF

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GB 20840.2-2014: [GB/T 20840.2-2014] Instrument transformers -- Part 2: Additional requirements for current transformers
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Basic data

Standard ID GB 20840.2-2014 (GB20840.2-2014)
Description (Translated English) [GB/T 20840.2-2014] Instrument transformers -- Part 2: Additional requirements for current transformers
Sector / Industry National Standard
Classification of Chinese Standard K41
Classification of International Standard 290.18
Word Count Estimation 63,672
Date of Issue 9/3/2014
Date of Implementation 8/3/2015
Older Standard (superseded by this standard) GB 1208-2006; GB 16847-1997
Quoted Standard GB 20840.1-2010; GB/T 156; GB 311.1; GB/T 3954; GB/T 5585.1; GB/T 7252; GB/T 7595
Adopted Standard IEC 61869-2-2012, MOD
Regulation (derived from) People's Republic of China Announcement of Newly Approved National Standards 2014 No. 24
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
Summary This Standard is applicable to measuring instruments for electrical and/or electrical protection devices used for newly manufactured frequency electromagnetic current transformer of 15Hz ~ 100Hz.

GB 20840.2-2014: [GB/T 20840.2-2014] Instrument transformers -- Part 2: Additional requirements for current transformers


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Instrument transformers.Part 2. Additional requirements for current transformers ICS 290.18 K41 National Standards of People's Republic of China Replacing GB 1208-2006, GB 16847-1997 Transformers Part 2. Supplementary requirements for current transformer technology Part 2. Additionalrequirementsforcurrenttransformers (IEC 61869-2.2012, MOD) Issued on. 2014-09-03 2015-08-03 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ Introduction Ⅴ 1 Scope 1 2 Normative references 1 3 Terms and definitions 3.1 General definitions 1 About 3.3 Current Rating Definition 2 3.4 concerning the definition of the accuracy of 3 3.7 Symbol and name 10 5 11 ratings Highest voltage for equipment 11 5.2 5.3 Rated insulation level 11 5.5 rated output 12 Accuracy class 5.6 rated 12 5.201 rated current value of the standard 17 5.202 rated secondary current standard value of 18 5.203 rated continuous thermal current standard value of 18 Short Current Rating 5.204 18 6 design and construction 18 Temperature rise of 6.4 pairs of parts and components of claim 18 Ground equipment requirements 18 6.5 6.13 mark 18 6.201 insulating oil performance requirements 21 6.202 pairs of outlet terminals of claim 21 6.203 pairs of oil-immersed current transformer structural requirements 21 7 Test 22 7.1 General 22 7.2 Type tests 23 7.3 Routine tests 26 30 7.4 Special tests 7.5 Sampling Test 30 Appendix 2A (informative) of this section with IEC 61869-2. structural changes in 2012 compared to 31 Appendix 2B (informative) of this section with IEC 61869-2.2012 technical differences and their causes 33 Appendix 2C (normative) low leakage reactance type of verification 35 Appendix 2D (Normative Appendix) P level, PR level protection current transformer 36 2D.1 phasor 36 2D.2 compensation turns 36 2D.3 Error Triangles 37 2D.4 composite error 37 Direct method 2D.5 composite error test 38 2D.6 other direct measurement of composite error 38 2D.7 Composite Application Error 39 Appendix 2E (normative) transient characteristics of protective current transformer 40 The basic theory of transient calculation formula 40 2E.1 Measurement 2E.2 core magnetization characteristic 44 Direct measurement method 2E.3 lower limit of the test error conditions 49 Experimentally determine the thermal time constant of reckoning method Appendix 2F (informative) oil-immersed transformer temperature rise test used in 52 Appendix 2G (informative) ratio difference (ε) an alternative measure 54 Appendix 2H (normative) to determine the turns ratio error 56

Foreword

This section on recommended and mandatory provisions of the regulations and GB 20840.1-2010 "transformers - Part 1. General technical requirements" the same. GB 20840 "transformer" intends divided into the following sections. --- Part 1. Common technical requirements; --- Part 2. additional technical requirements current transformer; --- Part 3. Supplementary technical requirements of electromagnetic voltage transformer; --- Part 4. Combined Transformer additional technical requirements; --- Part 5. additional technical requirements for capacitor voltage transformer; --- Part 6. electronic transformer and low power independent of the sensor complement common technical requirements; --- Part 7. Electronic voltage transformers supplementary technical requirements; --- Part 8. Electronic current transformers additional technical requirements; --- Part 9. Transformer digital interface; --- Part 10. Supplementary independent current sensor technology low power requirements; --- Part 11. Low-power complementary technologies independent voltage sensor requirements; --- Part 12. Combined electronic transformer and complementary combination of technical requirements independent of the sensor; --- Part 13. Independent merge cells. This is Part 2 GB 20840's. This section drafted in accordance with GB/T 1.1-2009 given rules. This Part replaces GB 1208-2006 "CT" and GB 16847-1997 "to protect the current transformers for transient performance begging". This section needs with GB 20840.1-2010 "transformers - Part 1. General technical requirements" supporting the use of. This section follows the GB 20840.1 of the preparation of the structure, is a supplement corresponding provisions of GB 20840.1, modification or replacement. When the terms of GB 20840.1 In this Part Not to mention the points in time, as long as reasonable, those terms would apply to this section. When specified in this section, "Added" when "modification" or "replacement", It means that the relevant provisions of GB 20840.1 in this section is adapted accordingly. For Zhang, bars, graphs, tables, notes and appendix in GB 20840.1-2010 based on additions, this section uses the following forms of ID. --- Chapter, article, figures, tables and notes are numbered from 201 starts; --- Appendix No. 2A, 2B and the like. This section uses redrafted law revision using IEC 61869-2.2012 "Transformers Part 2. complementary technologies to current transformer begging". This part of IEC 61869-2.2012, compared with more adjustment in the structure, are listed in the Appendix 2A of this section with IEC 61869-2. Chapter, article, figure, table number 2012 of the control list. Technical differences exist compared to 2012, the terms of these differences have been involved through gaps in its outer margin. This part of IEC 61869-2 A single vertical line at position (|) have been identified in Appendix 2B are given a list of corresponding technical differences and their causes. This section also made the following editorial changes. --- Increasing the "Introduction"; --- The full text of the unified formula is numbered; --- 3.4.3 and in the note of the contents of the text would read 3.4.203; --- To rationalize the provisions with later echoed the IEC standard 5.6.201.2 of general purpose and special purpose standard current transformer Quasi accuracy classes are predetermined; --- 207 for table of contents made editorial adjustments; --- Order the Appendix to re adjusted; --- To IEC standard Figure 2B.13 and 2E.1 been adjusted. Please note that some of the content of this document may involve patents. Release mechanism of the present document does not assume responsibility for the identification of these patents. This part is proposed by the China Electrical Equipment Industrial Association. This part of the National Standardization Technical Committee transformers (SAC/TC222) centralized. This section is drafted. Shenyang Transformer Research Institute Co., Ltd., State Grid Electric Power Research Institute, Dalian first transformer limited liability Any company, TBEA Kangjia (Shenyang) Transformer Co., Ltd., Dalian Northern Transformer Group Co., Ltd., Zhongshan City, Thailand-Electric have Limited, Jiangxi Power Electric Co., Ltd., Jiang Su Kexing Electric Co., Ltd., Dalian Transformer Co., Ltd., New Northeast Electric (Shenyang) High Voltage Switchgear Co., Ltd. Jingjiang, Jiangsu Transformer Co., Ltd., Baoding Tianwei Transformer Co., Ltd., Shenyang Transformer limited liability company. The main drafters of this section. cotton emperor, Zhang Zhong country Yeguo Xiong, Wang Xiaoqi, Xiaoyao Rong, Liu Yufeng, Yu Sha Chau, Wang Ren Tao, He see the light, Zhang Aimin, CAI Qiang, Zhang Jun, Yin Shian, Jiang Yong Xiong, Xue Tao night, Wang Yuan, Li Taochang, Lingui Wen, Liu Shuo, Liu Shuang. This part of the standard replaces the previous release case. --- GB 1208-2006; --- GB 16847-1997.

Introduction

IEC /TC38 standard system has been realigned, before the upcoming IEC 60044 series of standards is now readjusted IEC 61869 series of standards. In order to better use of international standards, the National Standardization Technical Committee transformers (SAC/TC222) The study Decided to our current system of national standards Transformer also press IEC /TC38 new standard system be realigned before the upcoming The individual transformers to national standards IEC 60044 series of standards by the corresponding relationship between IEC 61869 series of standards correspond to re Develop, constitute a "common technical requirements" general part and each "Supplementary technical requirements" section dedicated supporting new Transformers series Country standard. New national standards for transformers intended to form the overall situation is as follows. General part of the standard number and name Special section Standard Dedicated part of the standard name corresponding Original Standard GB 20840.1 General technical requirements GB 20840.6 Electronic transformer and low Independent power sensor Supplementary general technical requirements GB 20840.2 GB 20840.3 GB 20840.4 GB/T 20840.5 GB 20840.7 GB 20840.8 GB 20840.9 GB 20840.10 GB 20840.11 GB 20840.12 GB 20840.13 Additional technical requirements for current transformers Supplementary technical requirements Electromagnetic Voltage Transformer Additional technical requirements Combined Transformer Additional technical requirements for capacitor voltage transformers Additional technical requirements for electronic voltage transformer Additional technical requirements for electronic current transformer Transformer Digital Interface Independent supplementary low power current sensor technology requirements Independent supplementary low power voltage sensor technology requirements A combination of electronic transformer and combinations of independent sensors Additional technical requirements Independent merging unit GB 1208 GB 16847 GB 1207 GB 17201 GB/T 4703 GB/T 20840.7 GB/T 20840.8 GB/T 20840.7 Transformers Part 2. Supplementary requirements for current transformer technology

1 Scope

GB 20840 for this section applies to electrical measuring instruments and/or electrical protection devices use a frequency of 15Hz ~ 100Hz new Manufacture of electromagnetic current transformer.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. Chapter 2 GB 20840.1-2010 content with the following additions apply. GB/T 156 standard voltage (GB/T 156-2007, IEC 60038.2002, MOD) GB 311.1 insulation coordination - Part 1. Definitions, principles and rules (GB 311.1-2012, IEC 60071-1.2006, MOD) GB/T 3954 Electrical Pole GB/T 5585.1 electrician with copper, aluminum and its alloy bus - Part 1. Copper and copper alloy bus GB/T 7252 transformer oil dissolved gas analysis and judgment guidelines (GB/T 7252-2001, IEC 60599.1999, NEQ) Transformer oil quality GB/T 7595 running GB 20840.1-2010 transformers - Part 1. General Requirements (IEC 61869-1.2007, MOD)

3 Terms and Definitions

Terms and definitions defined in GB 20840.1-2010 and the following additions apply to this document. 3.1 General definitions 3.1.201 Current Transformer currenttransformer Under normal conditions, the secondary current is proportional to the primary current reality, and in the right way when the coupling phase difference close to zero Transformers. [GB/T 2900.15-1997, the definition 3.4.5] 3.1.202 Measuring current transformer measuringcurrenttransformer Information transfer current transformer signal for measuring instruments and meters. [GB/T 2900.15-1997, the definition 3.4.8, modified] 3.1.203 Protective current transformer protectivecurrenttransformer To protect and control means for transmitting information signals current transformer. [GB/T 2900.15-1997, the definition 3.4.7, modified] 3.1.204 P-level protection current transformer classPprotectivecurrenttransformer No residual magnetic flux limit of protective current transformer, under the symmetrical short-circuit current conditions its provisions saturation characteristics. 3.1.205 PR level protection current transformer classPRprotectivecurrenttransformer Having a residual magnetic flux limit protection current transformers, short-circuit current in symmetrical conditions set its saturation characteristics. 3.1.206 PX-level protection current transformer classPXprotectivecurrenttransformer No residual magnetic flux leakage reactance low limit protective current transformer, which is known as the secondary excitation characteristic, secondary winding resistance, secondary load electricity Resistance and turns ratio, then it is sufficient to determine the associated protection system performance. 3.1.207 PXR-level protection current transformer classPXRprotectivecurrenttransformer Having a residual magnetic flux limit protection current transformer, which is known as excitation characteristics, the secondary winding resistance, secondary load resistance and turns ratio When, that is sufficient to determine the relay contact associated with their performance. 201 Note. When the current transformer primary current contains a DC component, the situation will be more complicated. Therefore, in order to prevent the current transformer into saturation, using Current transformer with an air gap, but the same performance level and PX. 202 Note. reduce remanence air gap does not necessarily become a high leakage reactance current transformers (see Appendix 2C). 3.1.208 TPX-level transient characteristics of protective current transformer classTPXprotectivecurrenttransformerfortransientper- formance No residual magnetic flux limit of protective current transformer, the peak instantaneous error in transient short-circuit current conditions its provisions saturation characteristics. 3.1.209 TPY-level transient characteristics of protective current transformer classTPYprotectivecurrenttransformerfortransientper- formance Having a residual magnetic flux limit protection current transformer, the peak instantaneous error in transient short-circuit current conditions its provisions saturation characteristics. 3.1.210 TPZ-level transient characteristics of protective current transformer classTPZprotectivecurrenttransformerfortransientper- formance The protection of a secondary time constant predetermined value of current transformers to the peak AC component of the error specified in the transient short-circuit currents Its saturation characteristics. 3.1.211 Optional current transformer ratio selectable-ratiocurrenttransformer Using a winding line for access or access to a variety tapped secondary winding turns ratio of the current transformer. About 3.3 Current Rating Definition 3.3.201 Rated primary current ratedprimarycurrent Ipr As the performance of the current transformer primary current reference value. [GB/T 2900.15-1997, the definition 2.3.28] 3.3.202 Rated secondary current ratedsecondarycurrent Isr As the current transformer secondary current value of performance benchmarks. [GB/T 2900.15-1997, the definition 2.3.30] 3.3.203 Rated short-time thermal current ratedshort-timethermalcurrent Ith In the case of short-circuit the secondary winding of the current transformer can withstand without damage a current maximum root mean square value in a short time stipulated. [GB/T 2900.15-1997, definitions 2.3.18, modified] 3.3.204 Rated dynamic current rateddynamiccurrent Idyn In the case of short-circuit the secondary winding of the current transformer can withstand the electromagnetic force without electrical or mechanical damage to the maximum primary current Peak. [GB/T 2900.15-1997, the definition 2.3.20] 3.3.205 Rated continuous thermal current ratedcontinuousthermalcurrent Icth In the secondary winding is connected with the rated load, allowing continuous flow through the primary winding and the temperature does not exceed a predetermined value of the current value. [GB/T 2900.15-1997, definitions 2.3.19, modified] 3.3.206 Rated primary short-circuit current ratedprimaryshort-circuitcurrent Ipsc A transient short-circuit current side AC component rms value of the reference current transformer accuracy performance. Note 201. Ith limits associated with fever, Ipsc related to the accuracy limits, usually Ipsc less than Ith. 3.3.207 Excitation current excitingcurrent Ie When the primary winding and other windings open circuit current transformer nominal frequency sine wave voltage is applied to the second terminal of the secondary winding The current drawn by the root-mean-square value. [GB/T 2900.15-1997, the definition 2.3.9, modified] 3.4 concerning the definition of accuracy 3.4.3 The ratio difference ratioerror GB 20840.1-2010 3.4.3 and the following are applicable. Current transformer ratio difference (current error) according to equation (1) expressed as a percentage. ε = krIs-Ip Ip × 100% (1) Where. kr --- rated transformation ratio; Ip --- the actual primary current; Is --- under the measurement conditions, the actual flow through the secondary current when Ip. 201 Note. the amount of interpretation phase is shown in Figure 2D.1. 3.4.4 Retardation phasedisplacement Δφ GB 20840.1-2010 3.4.4 and the following are applicable. 201 Note. the amount of interpretation phase is shown in Figure 2D.1. 3.4.201 Rated resistive load ratedresistiveburden Rb Resistive load rating of the secondary connected in ohms (Ω). 3.4.202 Secondary winding resistance secondarywindingresistance Rct Actual secondary winding DC resistance in ohms (Ω), corrected to 75 ℃ or other temperature as may be prescribed. Note 201. Rct actual values. Not to be confused Rct upper limit, which can otherwise specified. 3.4.203 Composite error compositeerror εc At steady state, when a predetermined primary current and the secondary current in the positive direction of the terminal signs agreement following the difference between the root mean square value. a) the instantaneous value of the primary current; b) the instantaneous value of the actual secondary current multiplied by the rated transformation ratio. Composite error εc usually according to formula (2) percentage root mean square value of the primary current representation. εc = T∫ (Kr × is-ip) 2dt Ip × 100% (2) Where. kr --- rated transformation ratio; Ip --- primary current rms value; ip --- primary current instantaneous value; is --- secondary current instantaneous value; T --- a cycle of time. 201 Note. See further explanation 2D.4. [GB/T 2900.15-1997, definitions 2.3.17, modified] 3.4.204 Rated instrument limit primary current ratedinstrumentlimitprimarycurrent IPL Measuring current transformer secondary load equal to the rated load, the composite error is equal to or greater than the minimum primary current value at 10%. 3.4.205 Safety factor instrumentsecurityfactor FS Primary current and rated primary current ratio of rated instrument limit. 201 Note. It should be noted that the actual instrument security factor is the impact of the load. When the load is significantly lower than the nominal value, the short-circuit current in the secondary side will produce more High Current. 202 Note. If the system fault current through the current transformer primary winding, the rated instrument security factor FS is lower, by a transformer power supply means more safety. [GB/T 2900.15-1997, definitions 2.3.22, modified] 3.4.206 To measure the second limit potential secondarylimitinge.mfformearsuringcurrenttransformers current transformer EFS Instrument security factor FS, rated secondary current and the rated load impedance of the secondary winding and the three vector product. Note 201. Measuring current transformer secondary limit potential EFS according to equation (3) Calculated. EFS = FS × Isr × (Rct Rb) 2 X2b (3) Where. Rb --- resistance portion of the rated load; The reactance Xb --- rated load. The resulting value is higher than the actual value of this method. So the choice is to use the same protective current transformer test methods. See 7.2.6.202 and 7.2.6.203. [GB/T 2900.15-1997, definitions 2.3.25, modified] 3.4.207 Rated accuracy limit primary current ratedaccuracylimitprimarycurrent Maximum current transformer primary current to meet the requirements of the composite error value. [GB/T 2900.15-1997, the definition 2.3.23] 3.4.208 Accuracy limit factor accuracylimitfactor ALF Rated accuracy limit primary current and rated primary current ratio of. [GB/T 2900.15-1997, the definition 2.3.27] 3.4.209 Protective current transformer secondary limit potential secondarylimitinge.mfforprotectivecurrenttransformers EALF Accuracy limit factor, rated secondary current and the rated load impedance of the secondary winding and the three vector product. Note 201. P and PR potential EALF level protection according to formula (4) with a current transformer secondary limit calculated as follows. EALF = ALF × Isr × (Rct Rb) 2 X2b (4) Where. Rb --- resistance portion of the rated load; The reactance Xb --- rated load. 3.4.210 Saturation flux saturationflux Ψsat The maximum value of the current transformer secondary turns the flux linkage, corresponding to a magnetic saturation of the core material. 201 Note. saturation flux Ψsat determine the most appropriate method is 2E.2.3 in the DC saturation method. 202 Note. In previous GB 16847 in, Ψs defined as the inflection point value, it is characterized by a non-core saturation to saturation changes. This definition because the saturation value Too low to be recognized, and cause misunderstandings and conflicts. Thus, the replacement of Ψsat, defined as complete saturation. 3.4.211 Residual magnetic flux remanentflux Ψr After cutting the core excitation current 3min remaining turns of the secondary flux linkage value, the magnetizing current should be large enough to produce the saturation flux (Ψsat). 3.4.212 Remanence factor remanencefactor KR The ratio of the residual magnetic flux and the saturation flux, expressed as a percentage. 3.4.213 Secondary circuit time constant secondarylooptimeconstant Ts Current transformer secondary circuit time constant value determined by the magnetizing inductance and leakage inductance sum (Ls) and the secondary loop resistance (Rs), According to equation (5) Calculated. Ts = Ls Rs (5) 3.4.214 Excitation characteristics excitationcharacteristic When the current transformer primary winding and other windings open circuit, it is applied to the second terminal of the root mean square value of sinusoidal voltage and excitation current The relationship between the root mean square value, expressed as a curve or table column values. Coverage data should be sufficient to determine the value of the field from a low of 1.1 times until Abduction Point excitation characteristics of potential value. 3.4.215 Knee voltage kneepointvoltage Rated frequency sinusoidal voltage side of the current transformer when all other terminals are open, is applied to the second terminal of the root-mean-value increase The field current rms value increased by 50% plus 10%. [GB/T 2900.15-1997, definitions 2.3.36, modified] 3.4.216 Inflection potential kneepointe.mf The field current rms value increased by 50% of current transformer rated frequency potential, the value increased 10%. 201 Note. the inflection point voltage can be applied to the current transformer secondary terminals, and the potential turning point can not be directly manipulated. Inflection point and the inflection point voltage potential can be considered the number Values are equal, because the impact of the secondary winding resistance voltage drop is small. 3.4.217 Rated inflection potential ratedkneepointe.mf Ek Inflection point lower limit electric potential. 201 Note. Rated knee-level potential inclusion PX and PXR-level protection technology specification for current transformer. According to equation (6) Calculated. Ek = Kx × Rct R () b × Isr (6) 3.4.218 Rated turns ratio ratedturnsratio A turns ratio of the numerical value of the secondary turns provisions. Example 1. 1/600 (1 turn represents a number of turns, the secondary turns is 600 turns). Example 2. 2/600 (expressed as a number of turns 2 turns, the secondary turns is 600 turns). 201 Note. inclusion rated turns ratio PX and PXR grade-level protection with the technical specifications of the current transformer. 202 Note. Rated turns ratio and are rated transformation ratio is a secondary requirement. If comparing the two nominal ratio should be reciprocal. 3.4.219 Turns ratio error turnsratioerror εt The actual turns ratio represents the difference between the nominal turns ratio, the...

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