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GB/T 20995-2020 English PDF

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GB/T 20995-2020: Static var compensators(SVC). Testing of thyristor valves
Status: Valid

GB/T 20995: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20995-2020	684	Add to Cart	4 days	Static var compensators(SVC). Testing of thyristor valves	Valid
GB/T 20995-2007	RFQ	ASK	6 days	Power electronics for electrical transmission and distribution systems -- Testing of thyristor valves for static VAR compensators	Obsolete

Similar standards

GB/T 37404 GB/T 31487.3 GB/T 3859.1 GB/T 20996.1 GB/T 20990.1

Basic data

Standard ID: GB/T 20995-2020 (GB/T20995-2020)
Description (Translated English): Static var compensators(SVC). Testing of thyristor valves
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K46
Classification of International Standard: 29.240.99; 31.080.20
Word Count Estimation: 36,339
Date of Issue: 2020-12-14
Date of Implementation: 2021-07-01
Older Standard (superseded by this standard): GB/T 20995-2007
Quoted Standard: IEC 60060-1; IEC 60060-2; IEC 60060-3; IEC 60071-1; IEC 60071-2; IEC 60071-5; IEC 60071-1-2006; IEC 60071-1-2006/AMDL-2010; IEC 60700-1-2015
Adopted Standard: IEC 61954-2017, IDT
Regulation (derived from): National Standard Announcement No. 28 of 2020
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the type test, factory test and option test of thyristor valves. These thyristor valves are suitable for some static reactive power compensation devices (SVC) in the power system, namely thyristor controlled reactor (TCR), thyristor switching reactor (TSR) and thyristor switching capacitor (TSC). The requirements of this standard apply to both a single valve unit (single-phase) and multiple valve units (multi-phase). Chapter 4 to Chapter 7 of this standard details the type test, that is, the test used to check whether the valve design meets the specified requirements. Chapter 8 outlines the factory test, which is the test used to determine the manufacturing quality. Chapter 9 and Chapter 10 detail optional tests, which are additional tests besides type tests and factory tests.

GB/T 20995-2020: Static var compensators(SVC). Testing of thyristor valves

---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.
(Static Var Compensation Device Test of Thyristor Valve) ICS 29:240:99;31:080:20 K46 National Standards of People's Republic of China Replace GB/T 20995-2007 Test of thyristor valve of static var compensation device (IEC 61954:2017, IDT) 2020-12-14 release 2021-07-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Preface Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 General requirements for type test, factory test and option test 2 4:1 Test overview 2 4:2 Sample 4 4:3 Implementation guidelines for type test and option test 5 4:4 Test conditions 5 4:5 Number of components allowed to fail in type test 7 4:6 Documentation of test results 7 5 Type test of TCR and TSR valve 8 5:1 Insulation test between valve end and ground 8 5:2 Insulation test between valves (only applicable to multiple valve units) 9 5:3 Insulation test between valve ends 10 5:4 Operation test 12 6 Type test of TSC valve 14 6:1 Valve end insulation test to ground 14 6:2 Insulation test between valves (only applicable to multiple valve units) 16 6:3 Insulation test between valve ends 18 6:4 Run test 20 7 Electromagnetic interference test 24 7:1 Test purpose 24 7:2 Test procedure 24 8 Factory test 24 8:1 Overview 24 8:2 Visual inspection 25 8:3 Connection check 25 8:4 Checking the equalizing/damping circuit 25 8:5 Withstand voltage check 25 8:6 Inspection of auxiliary equipment 25 8:7 Trigger check 25 8:8 Pressure test of cooling system 25 8:9 Partial discharge test 25 9 Option test of TCR and TSR valve 25 9:1 Overcurrent test 25 9:2 Transient forward voltage test during recovery period 26 9:3 Aperiodic trigger test 27 10 Option test of TSC valve 28 10:1 Transient forward voltage test during recovery period 28 10:2 Aperiodic trigger test 29

Foreword

This standard was drafted in accordance with the rules given in GB/T 1:1-2009: This standard replaces GB/T 20995-2007 "Power electronic technology for power transmission and distribution systems, static reactive power compensation devices for thyristor valves Compared with GB/T 20995-2007, the main technical changes are as follows: ---Added the title of the hanging paragraph in the standard; --- Added "The test product is generally a valve or an appropriate equivalent number of valve segments" (see 4:2:6); --- Deleted "Some type tests can be performed on complete valves or valve components, see Table 1" (see 4:3 in the:2007 edition); --- Deleted "The test items that can be performed on the valve assembly are shown in Table 1:" (See 4:4:1 of the:2007 edition); --- Added "Atmospheric Correction" (see 4:4:1:2); --- Added "Industry experience found that even if the valve is carefully designed, it is impossible to avoid accidental randomness of thyristor-level components during operation: malfunction: Although these failures may be stress-related, they are random to the extent that they cause failures, or failures cannot be predicted The relationship between rate and stress: Or there is no precise quantification that can stand the test: When performing a type test on a valve or valve section, in a short time, apply The multiple stresses are generally equivalent to the few worst stresses that the valve may withstand during its entire life: Taking into account As long as the failure is random and does not indicate any typical design defects, the type test items listed below are successful According to the permit, there are a small number of thyristor-level failures during the type test: "(See 4:5); ---Added "Table 2 The number of thyristor levels allowed to fail in the type test" (see 4:5); ---Added "within about 10s" and revised "reduced voltage to Uts2" to "reduced voltage from 100% Uts1 to Uts2" (see 5:1:2:3, 5:1:1:3 of the:2007 version); ---Added "within about 10s" (see 5:2:2:3); --- Change "equal to the smaller of Utv11 and Utv12" to "equal to the smallest of Utv11, Utv12 and Utv13", the test coefficient ks13 is changed from "1:3" was changed to "1:15" (see 5:3:2:2, 5:3:1:2 of the:2007 edition); ---Added "within about 10s" (see 5:3:2:3); --- Change the test coefficient ks from "1:3" to "1:15" (see 5:3:3:2, 5:3:2:2 of the:2007 edition); --- Deleted "The above three tests are determined by design: The specific additional conditions are as follows:" and the contents of the additional tests 1 and 2 Content (see 5:3:2:3 of the:2007 edition); --- Modify "between 0:2ms before the current zero crossing to 1ms after zero crossing" to "0:2ms before the current zero crossing to zero crossing when the thyristor is turned off Between the next 1ms" (see 5:4:1:2, 5:4:1:2 of the:2007 edition); --- Deleted "This test should be performed on a complete valve or valve assembly", and added "The test safety factor is 0:95" (see 5:4:2:2, 5:4:2:2 of the:2007 edition); --- Deleted "This test should be carried out on a complete valve or valve assembly" (see 5:4:3:2 of the:2007 edition); --- Modify "3h test voltage Uts2" to "10min test voltage Uts2": The test voltage formula is modified to Utac2=ks2×Uac2× sin(2πft), the test coefficient ks2 is changed from "1:2" to "1:15" (see 6:1:2:2, 6:1:1:2 of the:2007 edition); ---Added "within about 10s" and deleted the last five lines (see 6:1:2:3, 6:1:1:3 of the:2007 edition); --- Modify "Ut2(ac)=ks2×(Uac2 Udcm2)/2" to "Ut2(ac)=ks2×Uac2/2" and add "within about 10s", Added "The test should be carried out separately for the positive and negative polarity of the DC voltage: 1) Within about 10s, adjust the voltage from Ut1(dc) 50% boost to 100%; 2) maintain Ut1(dc) for 1 min; 3) reduce the voltage to zero: "(See 6:1:2:4, 6:1:1:4 of the:2007 edition); --- Change "3h test voltage Utvv2" to "10min test voltage Utvv2": The voltage formula is changed to Utvv2=ks2×Uac2× sin(2πft), delete "not including DC component" in the definition of Uac2 (see 6:2:2:2,:2007 edition 6:2:1:2); ---Added "within about 10s" and deleted the last five lines (see 6:2:2:3, 6:2:1:3 of the:2007 edition); ---Added "within about 10s", modified the formula in b), and added "the test should be conducted separately for the positive and negative polarities of the DC voltage Row: 1) In about 10s, the regulated voltage rises from 50% of Ut1(dc) to 100%; 2) Maintain Ut1(dc) for 1min; 3) Reduce the voltage Press to zero: "(See 6:2:2:4, 6:2:1:4 of the:2007 edition); --- "The test shall apply 3 positive and 3 negative lightning shocks respectively between the short-circuited valve ends and the ground" as "The test shall apply 3 times of positive polarity and 3 times of negative lightning impulse voltage between the valves" (see 6:2:3:3,:2007 edition 6:2:2:3); --- Modify the test coefficient ks1 from "1:3" to "1:15"; modify the "30min test voltage Utv2" to "10min test voltage" Utv2", modified the test voltage formula, the definition of Uac2 was changed from "the peak value of the maximum line voltage during steady state operation" to "between valve terminals The peak value of the highest steady-state operating voltage", the test coefficient ks2 is changed from "1:2" to "1:15" (see 6:3:2:2,:2007 edition 6:3:1:2); ---Added "within about 10s" and revised "maintain voltage Utvv230min" to "maintain voltage Utvv210min" (see 6:3:2:3, 6:3:1:3 of the:2007 edition); ---Added "within about 10s" and "tests should be carried out separately for the positive and negative polarities of the DC voltage: 1) Within about 10s, Adjust the voltage from 50% of Ut1 (dc) to 100%; 2) maintain Ut1 (dc) for 1 min; 3) reduce the voltage to zero: "(See 6:3:2:4); --- Modify the test coefficient ks from "1:3" to "1:15" (see 6:3:3:2, 6:3:2:2 of the:2007 edition); --- Deleted "The overcurrent test can be achieved by an oscillating circuit, whose circuit consists of reactors, capacitors and the power frequency power supply group that supplies them: Or through a suitable synthetic test loop: "(See 6:4:1:2:3 of the:2007 edition); --- Deleted "The test should be carried out on the thyristor string that conducts in both directions:" (see 6:4:1:2:3 of the:2007 edition); --- Deleted "The test can be performed on a complete valve or valve assembly", and added "The test safety factor is 0:95:" (see 6:4:2:2,:2007 edition 6:4:2:2); --- Added "Partial Discharge Test" (see 8:9); --- Added "For the test carried out on the valve section, the voltage Utsv amplitude should be scaled according to 4:4:3:2:" (see 9:2:2); --- Added "The valve is triggered to conduct when the voltage reaches Utsv2", and the test coefficient ks is changed from "1:3" to "1:15" (see 9:3:2); --- Added "For the test carried out on the valve section, the voltage Utsv amplitude should be scaled according to 4:4:3:2:" (see 10:1:2); --- "Ucms---according to GB 311:1-1997, or the expected operating impulse voltage value determined by the insulation coordination study;" amended to "Ucms---the operating impulse voltage level determined by the insulation coordination study", the test coefficient ks is changed from "1:3" to "1:15" (See 10:2:2, 10:2:2 of the:2007 edition); --- Modify "The valve should be triggered to conduct at the peak of the operating impulse voltage" to "The valve should be triggered to conduct when the voltage peak reaches Utsv2 Pass" (see 10:2:3, 10:2:3 of the:2007 edition): The translation method used in this standard is equivalent to IEC 61954:2017 "Testing of Thyristor Valves for Static Var Compensation Devices": The Chinese documents that have a consistent correspondence with the international documents cited in this standard are as follows: ---GB/T 311 (all parts) insulation coordination [IEC 60071 (all parts)]; ---GB/T 311:1-2012 Insulation coordination Part 1: Definitions, principles and rules (IEC 60071-1:2006, MOD); ---GB/T 7354-2018 Partial discharge measurement of high voltage test technology (IEC 60270:2000, MOD); ---GB/T 16927 (all parts) high voltage test technology [IEC 60060 (all parts)]; ---GB/T 16927:1-2011 High voltage test technology Part 1: General definition and test requirements (IEC 60060-1:2010, MOD); ---GB/T 16927:2-2013 High Voltage Test Technology Part 2: Measurement System (IEC 60060-2:2010, MOD); ---GB/T 20990:1-2007 HVDC Thyristor Valve Part 1: Electrical Test (IEC 60700-1:1998, IDT); ---GB/T 28563-2012 ±800kV UHV DC transmission with thyristor valve electrical test (IEC 60700-1:2008, MOD): This standard also made the following editorial changes: --- Errata "Uts1" to "Utv1" (see 5:3:2:3); ---Correct "above d)" as "above 4)" (see 6:1:2:4, 6:2:2:4 and 6:3:2:4): This standard was proposed by China Electrical Equipment Industry Association: This standard is under the jurisdiction of the National Power Electronic System and Equipment Standardization Technical Committee (SAC/TC60): Drafting organizations of this standard: Global Energy Internet Research Institute Co:, Ltd:, Xi'an High Voltage Apparatus Research Institute Co:, Ltd:, China Southern Power Grid Academy of Sciences Co:, Ltd:, China Southern Power Grid Co:, Ltd: EHV Transmission Company, Xu Ji Electric Co:, Ltd:, Tsinghua University, Nanjing Nanrui Relay Electric Co:, Ltd:, Xi’an Xidian Power System Co:, Ltd:, Xi’an Institute of Power Electronics Technology, State Grid Economic Technology Technology Research Institute Co:, Ltd:, China Power Purui Technology Co:, Ltd: The main drafters of this standard: Wang Gaoyong, Xu Fan, Wei Wei, Tang Jinkun, Li Juan, Yang Xiaohui, Chen Chihan, Ma Yuanshe, Wei Hongqi, Huang Yongrui, Yu Zhanqing, Li Yuan, Sun Mei, Hao Zhiyuan, Zhou Huigao, Zhu Ninghui, Xu Zimeng, Dong Tianhua, Zhang Teng: The previous versions of the standard replaced by this standard are as follows: ---GB/T 20995-2007: Test of thyristor valve of static var compensation device

1 Scope

This standard specifies the type test, factory test and option test of thyristor valves: These thyristor valves are suitable for parts in power systems Sub-Static Var Compensation Device (SVC), namely Thyristor Controlled Reactor (TCR), Thyristor Switching Reactor (TSR) and Thyristor Switching Reactor (TSR) Container (TSC): The requirements of this standard apply to both a single valve unit (single phase) and multiple valve units (multiphase): Chapter 4~Chapter 7 of this standard details the type test, which is the test used to check whether the valve design meets the specified requirements: Chapter 8 Overview Describes the factory test, which is the test used to determine the manufacturing quality: Chapter 9 and Chapter 10 detail optional tests, namely type tests and factory tests: Additional tests other than the test:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article Pieces: For undated references, the latest version (including all amendments) applies to this document: IEC 60060 (all parts) High-voltage test techniques (High-voltage test techniques) IEC 60060-1 High-voltage test techniques Part 1: General definitions and test requirements (High-voltagetest techniques- Part 1:Generaldefinitionsandtestrequirements) IEC 60060-2 High-voltage test technology Part 2: Measurement system (High-voltage test techniques-Part 2: Meas- uringsystems) IEC 60071 (all parts) Insulation coordination (Insulationco-ordination) IEC 60071-1:2006 Insulation coordination Part 1: Definitions, principles and rules (Insulationco-ordination-Part 1: Definitions,principlesandrules) IEC 60071-1:2006/AMD1:2010 IEC 60270 High-voltage test techniques-Partial discharge measurement (High-voltagetest techniques-Partialdischarge measurements) IEC 60700-1:2015 Thyristor valves for high-voltage direct current transmission Part 1: Electrical test [Thyristorvalvesforhigh-volt- agedirectcurrent(HVDC)powertransmission-Part 1:Electricaltesting]

3 Terms and definitions

The following terms and definitions apply to this document: 3:1 Thyristorlevel The component part of the thyristor valve is composed of a thyristor or multiple parallel or anti-parallel thyristors and the auxiliary equipment and electric The reactor (if any) constitutes: 3:2 Thyristor (series) string Tandem thyristors in the same direction that constitute the thyristor valve: ......

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Question 2: Can I share the purchased PDF of GB/T 20995-2020_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 20995-2020_English will be deemed to be sold to your employer/organization who actually pays 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+ countries

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Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 20995-2020?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 20995-2020 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.