GB/T 25121.1-2018Railway applications -- Rolling stock equipment -- Capacitors for power electronics -- Part 1: Paper/plastic film capacitors (English PDF)

Foreword

GB/T 25121 "Railway Locomotive Vehicle Equipment Power Electronic Capacitor" is divided into three parts.

--- Part 1. Paper/plastic film capacitors;

---Part 2. Non-solid electrolyte aluminum electrolytic capacitors;

--- Part 3. Electric double layer capacitors.

This part is the first part of GB/T 25121.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 25121-2010 "railway locomotive vehicle equipment power electronic capacitor", and GB/T 25121-

Compared with.2010, the main technical changes except editorial changes are as follows.

--- Revised the scope of the standard (see Chapter 1, Chapter 1 of the.2010 edition);

---Modified the contents of the normative reference documents (see Chapter 2, Chapter 2 of the.2010 edition);

--- Added "Isolation Metallization Design" "Special Non-Isolated Metallization Design" "Series Resistance" "Equivalent Series Inductance" "Heat Balance" "Hot

Terms and definitions of time constants (see Chapter 3);

--- Removed the term and definition of "continuous duty cycle" and "shell temperature rise" (see Chapter 3 of the.2010 edition);

--- Revised "the altitude does not exceed 1400m" as "the altitude does not exceed 2500m" (see 4.1.1, 4.1.1 of the.2010 edition);

---Modified ambient temperature requirements (see 4.1.2,.2010 version 4.1.2);

--- Added details of special use conditions (see 4.2);

--- Revised the type test content, supplemented with the factory test content and also the type test project (see 5.2.5, Table 2,.2010 edition)

5.1.2, Table 2);

--- Increased partial discharge measurement requirements (see 5.2.3 and 5.2.5);

--- Increased the measurement of capacitance and tan delta in the factory inspection "For capacitors in the millimeter range, the accuracy can be negotiated between the supplier and the buyer.

Determine" (see 5.3);

--- Revised the allowable deviation range of capacitance "+/-10%" to "+/-5%" (see 5.3.2, 5.3.2 of.2010 edition);

--- Modified the terminal test voltage AC capacitor, unified test voltage of self-healing and non-self-healing capacitors (see 5.5.1,.2010)

Version 5.5.1);

--- Removed the description of "If the voltage is increased by 10% and the duration can be reduced to 2s" (see 5.5.1 of the.2010 edition);

--- Removed the description of "capacitor at the highest case temperature" (see 5.5.3 of the.2010 edition);

--- Added a description of "If the voltage is increased by 10% and the duration can be reduced to 2s" (see 5.6.1);

---Modified terminal and enclosure test voltage requirements (see 5.6.1, 5.6.1 of the.2010 edition);

--- Modified the limit for the maximum inrush current, from the original "^Itest=1.4^IS" to "^Itest=1.1^IS" (see 5.9,.2010 edition)

5.9);

--- Revised the "thermal stability test" as "thermal stability test" (see 5.10, 5.10 of the.2010 edition);

--- Increased capacitor performance measurement criteria after thermal stability test (see 5.10.2);

--- Added test requirements for AC filter capacitors (see 5.10.2, Note 3);

--- Revised the content of the routine test voltage and self-healing test of the self-healing test (see 5.11, 5.11 of the.2010 edition);

--- Modified the self-healing test method (see 5.11, 5.11 of the.2010 edition);

--- Increased requirements for environmental testing (see 5.13.1);

--- Revised the content of the voltage test after the constant damp heat test (see 5.13.2, 5.13.2 of the.2010 edition);

---Modified "visual inspection" to "general inspection" and increased weighing requirements (see 5.14.2,.2010 edition 5.14.2);

--- Increased the durability test 5.15.1 "Overview", the subsequent sub-segment number is postponed (see 5.15);

--- Removed the contents described in Table 6 (see 5.14 of the.2010 edition);

--- Increased test conditions for capacitors with special requirements and no corresponding standards (see 5.14.3);

--- Revised the durability test content (see 5.15, 5.15 of the.2010 edition);

--- Revised the initial capacitance and loss tangent in the durability test (see 5.15.3,.2010 edition 5.15.2);

--- Modified the peak current of 1000 charge and discharge (see 5.15.3, 5.15.3 of the.2010 edition);

---Modified the test procedure for the AC capacitor test voltage 1.25UN (see 5.16.2, 5.16 of the.2010 edition);

--- Modified the destructive test, increased the performance relationship between the damage test and the system safety type, and the test of the DC capacitor test program

Method, removing destructive test requirements (see Table 7 of 5.16.1);

--- Increased the determination of the isolation metallization design and the special non-isolated metallization design capacitance (see 5.16.2);

--- Modified the "maximum allowable voltage" to "overload" (see Chapter 6, Chapter 6 of the.2010 edition);

--- Increased the requirements for marking in environmental protection (see 7.3);

--- Increased test requirements for flame retardant properties (see 7.4);

--- Added the nameplate, the capacitor with protection device can be marked (see 8.1);

---Modified the way in which measures may be taken during installation (see 9.3.2, version 9.3.2 of.2010);

--- Modified the selection of creepage distance and clearance, refer to GB/T 32350.1 (see 9.8,.2010 edition)

9.8);

--- Modified "the insulation voltage of the unit should be suitable for series arrangement" as "the insulation voltage of the unit should be considered in the series arrangement" (see 9.11,

40 ° C, in line with the actual situation in China;

--- Increased the partial discharge measurement requirements in 5.2.3, Table 2, increased the test requirements;

--- Removed the 5.2.3 medium-sized inspection of the test article requirements "by the manufacturer's choice" to adapt to China's national conditions;

--- Revised the allowable deviation range of "5.3.2 capacitance" "+/-10%" to "+/-5%" to improve the control requirements;

--- Increased the capacitance of 5.5.3 and the measurement of tan according to the provisions of 5.3, the test is more specific;

--- Revised the test voltage of 5.6.1 terminal and outer casing to improve the test assessment requirements;

--- Modified the 5.9 surge discharge test content, delete "for large units, may take more than 10min", not easy to define;

--- Revised the final test content after the 5.10 thermal stability test, increased the judgment basis, and facilitated the performance evaluation of the capacitor;

--- Revised the 5.13 environmental test requirements, in line with China's actual needs;

--- Deleted the contents described in Table 6, which does not meet the actual use situation in China;

--- Revised 5.14.2 "Appearance Inspection" as "General Inspection" and increased weighing requirements to meet the actual situation in China;

--- Amend the note in 5.16.1 to the body column because it contains the requirements;

--- Amend the note in 7.1 as a clause because it contains requirements;

---Modified part of the 8.1 nameplate, the original "unprotected capacitor" as "unprotected" logo, modified to "protected

"Set the capacitor" to "protect" the logo to meet the actual situation in China;

--- Revised the way in which the measures may be taken during installation in 9.3.2, refining the principle of selection of capacitors.

This section also made the following editorial changes.

--- Modified 3.32 "Resr" and added "ESR" expression.

--- Modified the error in IEC 61881-1.2010.

* The document IEC originally quoted in 4.1.1 is "IEC 62491" and is incorrect. It should be "IEC 62498-1". This part is amended to

"GB/T 32347.1-2015 Environmental conditions for rail transit equipment - Part 1. Equipment for rolling stock (IEC 62498-1.

2010, MOD)";

* Revised the voltage test content after the constant damp heat test, the original "after the constant test is completed, the capacitor is in accordance with 5.5.1

Perform voltage test between terminals and voltage test of terminal and case according to 5.6.1"

After completion, the capacitor is tested for voltage between the terminals in accordance with 5.5.3, and the power between the terminals and the case is performed according to 5.6.2.

Pressure test";

* The reference clause "5.17.5" in 5.16.2 shall be "5.17.4";

* The reference clause in 5.15.5 "described in Chapter 5" is incorrect and should be "as described in 5.15.3";

* The clause "Chapter 5" cited in 5.15.6 is incorrect and should be "measured according to 5.15.3 and 5.15.5";

* In 5.16.1, "the DC-AC cycle or AC-DC cycle test is determined by the manufacturer's choice" is incorrect and should be

"The manufacturer decides to apply a DC-AC cycle or DC-DC cycle test";

* In 5.16.3, "If the capacitor is protected by an overpressure detector, it is replaced by a circuit breaker controlled by a pressure detector.

The fuse in Figure 2 is incorrect and should be "fuse in Figure 1."

--- Revised the introduction of the dielectric loss factor. The original text is changed from tand to tan deltad.

--- Revised the presentation order of Appendix B.

--- Revised references.

1 Scope

This part of GB/T 25121 specifies the use conditions, quality requirements and inspection, overload, safety requirements and standards of power electronic capacitors.

Guidelines for the identification, installation and application.

This section applies to power electronic capacitors used in rail transit vehicles.

The capacitors covered in this section are rated up to 10000V.

The operating frequency of such a capacitor system is usually less than 15 kHz, and the pulse frequency can reach 5 to 10 times the operating frequency.

Capacitors are divided into AC capacitors and DC capacitors.

The capacitor is mounted as a component in the housing.

Note. This section applies to a wide range of capacitor technologies, including overvoltage protection, DC and AC filters, switching circuits, DC energy storage, auxiliary converters, etc.

Capacitors used in many applications.

This section does not apply to the following capacitors.

--- Capacitors for induction heating devices operating at frequencies below 50 kHz (see GB/T 3984.1 and GB/T 3984.2);

--- AC motors and capacitors for similar applications (see GB/T 3667.1 and GB/T 3667.2);

--- Capacitors used in circuits that suppress one or more harmonics in an electrical power supply network;

--- Small AC capacitors for fluorescent lamps and discharge lamps (see GB/T 18489 and GB/T 18504);

--- Capacitors for suppressing electromagnetic interference (see GB/T 6346.14);

---Parallel capacitors for AC power systems with a nominal voltage above 1000V (see GB/T 11024.1, GB/T 11024.2,

GB/T 11024.3 and GB/T 11024.4);

--- Self-healing parallel power capacitors for AC power systems with nominal voltages of 1000V and below (see GB/T 12747.1 and

GB/T 12747.2);

--- Non-self-healing parallel power capacitors for AC power systems with nominal voltages of 1000V and below (see GB/T 17886.1,

GB/T 17886.2 and GB/T 17886.3);

---Series capacitors for power systems (see GB/T 6115.1, GB/T 6115.2, GB/T 6115.3 and GB/T 6115.4);

---Coupling capacitors and capacitor dividers (see GB/T 19749.1);

--- for the storage of energy/high current discharge, such as capacitors in photocopiers and laser machines;

---Microwave capacitors (see GB/T 18939.1);

--- Power electronic capacitors other than rail transit (see GB/T 17702).

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 2423.3 Environmental Test Part 2. Test Method Test Cab. Constant Damp Heat Test (GB/T 2423.3-2016,

IEC 60068-2-78.2012, IDT)

GB/T 2423.22-2012 Environmental testing - Part 2. Test methods Test N. Temperature change (IEC 60068-2-14.