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

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=ks2xUac2x

sin(2pift), 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)=ks2x(Uac2 Udcm2)/2" to "Ut2(ac)=ks2xUac2/2" 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=ks2xUac2x

sin(2pift), 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:

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: