Some standard content:
JB/T8636-1997
Compared with the original JB2530-79 standard, the technical performance parameters specified in this standard have the following major changes: a) The text of this standard is condensed, and the detailed contents of the model spectrum and technical requirements are quoted from the corresponding standards and are no longer mentioned; b) This standard deletes the "Type Capacity" chapter; c) This standard adds a chapter on rated parameters, which stipulates the rated capacity, rated voltage, and rated current; d) This standard proposes new concepts such as fundamental voltage and fundamental current. The load loss increased by high-order harmonics should be included in the total load loss and the method for calculating the total load loss is given, pointing out that this total load loss must be fully considered for the thermal calculation and temperature rise test of product design; e) For the temperature rise test, limit values and requirements are proposed, the calculation formula for the test equivalent current is stipulated, and the test method is stipulated. Appendix A in this standard is the standard appendix, and Appendix B is the prompt appendix. This standard is proposed and managed by the Shenyang Transformer Research Institute of the Ministry of Machinery Industry. The main drafting units of this standard are: Shenyang Transformer Research Institute, Shenyang Transformer Co., Ltd., Xi'an Transformer Factory, Jiangxi Transformer Factory, Nantong Transformer Factory.
Participating drafting units of this standard are: Tongchuan Rectifier Transformer Factory, Beijing Transformer Factory, Guangxi Liuzhou Special Transformer Factory, Yangtze River Transformer Factory, Beijing Transformer Factory No. 2, Wuxi Power Transformer Factory, Shanghai Electric Co., Ltd. Transformer Factory, Shenyang Rectifier Furnace Transformer Factory.
The main drafters of this standard are: Li Jinghua, Wang Ningzhi, Zhang Hong, Shangguan Yuanding, Xu Defu, Wang Shizhong, Sun Dianchen. This standard was first formulated in 1979 and revised for the first time in 1996; JB2530-79 will be invalid from the date of implementation of this standard; Shenyang Transformer Research Institute is entrusted with the interpretation of this standard. otjpg
1 Scope
Machinery Industry Standard of the People's Republic of China
JB/T8636--1997
Replaces JB2530--79
This standard specifies the parameters, tests and test methods, markings, packaging and other general technical requirements for oil-immersed and dry-type power converter transformers (hereinafter referred to as transformers) with a grid-side system nominal voltage of 220kV and below. This standard applies to transformers in semiconductor power converters, including built-in balancing reactors, saturation reactors, etc. This standard does not apply to transformers for high-voltage DC transmission and transformation and single-phase traction transformers. This standard only puts forward requirements for the general part of the transformer. Each type of transformer should compile corresponding standards based on this standard according to its own characteristics to make supplementary provisions for special parts. Note: For transformers using other cooling media, this standard can be used as a reference. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB 1094.1-1996
GB1094.2—1996
GB1094.3—85
GB 1094.5-85
GB/T2900.15-1997
GB/T3859.1-93
CB/T3859.2-93
GB6450-86
GB/T6451--1995
GB/T 7328--87
GB/T13499-92
GB/T15164-94
GB/T10228-1997
JB/T3837-1996
3 Definitions and symbols
3.1 Definitions
Power transformers Part 1 General provisions (neq.IEC76-1: 1976) Power transformers Part 2 Temperature rise (neq.IEC76-2: 1976) Power transformers Part 3 Insulation levels and insulation tests (neqIEC76-3:1980) Power transformers Part 5 Short-circuit withstand capability (neqIEC76-5:1976) Electrical terminology Transformer Transformer Voltage regulator Reactor Semiconductor converter Basic requirements (eqvIEC146-1:1991) Code of practice for the application of semiconductor converters (eqvIEC146-1-2:1991) Thousand-type power transformers (eqyIEC726:1982) Three-phase Technical parameters and requirements for oil-immersed power transformers (neqDIN42500:1984) Determination of sound levels of transformers and reactors (nepIEC551;1976) Guidelines for the application of power transformers (eqvIEC6061978) Guidelines for the load of oil-immersed power transformers (idtIEC354) Technical parameters and requirements for dry-type power transformers Method for compiling transformer product models
The definitions used in this standard are based on the following standards: GB/T2900.15.GB1 094.1
GB/T3859.1 and GB/T3859.2
3.2 Symbols
The symbols used in this standard are as follows: p
Number of pulses;
Approved by the Ministry of Machinery Industry on September 5, 1997
Implementation on January 1, 1998
Number of commutation phases;
JB/T8636-1997
Number of commutation phases corresponding to each primary winding and commutated simultaneously. Number of series commutation phases
Number of shunt commutation phases.
Grid-side current (RMS value)
Valve-side current (RMS value);
DC current (arbitrary specified value):
Converter agreed no-load DC voltage;
Ideal no-load DC voltage;
Transformer valve-side no-load line voltage;
Ideal no-load peak voltage. Ignoring internal and external surge voltages and valve voltage drops, as well as the ideal no-load peak voltage that appears between the terminals of the arm under no-load conditions, the slope remains unchanged at light-load currents close to the transition current;d xt
Inductive DC voltage regulation rate caused by the transformer, based on U&; Percentage of the inductive reactance component of the transformer short-circuit impedance voltage corresponding to IpN; Per-unit value.
Model and rated parameters
4.1 Transformer model
The transformer model is compiled in accordance with the provisions of JB/T3837. 4.2 Rated DC current
The rated DC current should be selected from the following values: 1, 2, 5, 10, (15), 20, (30), (40), 50, (80), 100, (125), (160), 200, (250), 315, 400, 500, 630, 800, 1000, 1250, 16.00, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000A. Note
1 When using values other than the above values, currents greater than 1000A can be selected from the R20 series, and currents less than 100A can be selected from the R10 series. 2 Values marked with () are non-preferred values.
4.3 Rated DC voltage
The rated DC voltage should be selected from the following values: 3, 6, 12, 15, 18:24, (30), 36, 48, 60, 72, 90, (100), 115/110, 125, 160, 200, 230/220, 250, (275), 315, 400, 460/440, 500, (600), 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000V..*. Note
The 110, 220, and 440V below the slash are applicable to the rated DC voltage of the rectifier supplying power to a specific load, and the 115, 230, and 460V above the slash are applicable to the rated DC voltage of the rectifier supplying power to the system. 2 When the rated DC voltage is above 630V and the listed values cannot meet the use requirements, the R20 series should be selected. 3 The values with () are non-preferred values.
Transformer no-load DC voltage
Unless otherwise specified by the manufacturer and the user, the transformer no-load DC voltage should be in accordance with the relevant standards. 4.5 Nominal voltage of transformer grid-side system
Nominal voltage of transformer grid-side system should be selected according to Table 1 based on rated capacity of converter: 3
Rated capacity of converter
>50~250
>250~3150
>3150~12500
>12500
>20000
4.6 Electric connection
JB/T8636-1997
Table 1 Transformer grid voltage and converter rated capacity Grid voltage kv
Common transformer winding electric connection phase diagram and calculation factors are as shown in Table 2. 4.7 Transformer rated parameters
4.7.1 Rated capacity
The three-phase rated capacity of the transformer is based on the steady-state basic frequency sinusoidal component, which is the basis for the test and guarantee value. Its expression is: Sr=V3.U,·I
Where: SR---transformer three-phase rated capacity; U,--the fundamental component of the rated line voltage (root mean square value); I--the fundamental component of the rated line current (root mean square value). Note: The capacity corresponding to the rated non-sinusoidal load current IPN on the grid side, that is, the grid side capacity is the basis for electricity consumption billing. The requirements for temperature rise and cooling should take into account the load loss increased by the harmonic component. The load capacity of the transformer is actually a temperature rise issue. The load capacity also determines the capacity of the transformer. The following DC load conditions can determine the corresponding appropriate capacity. a) The load changes rapidly, the peak current duration is within 5 minutes, and the average value of the long-term load is the rated DC current; b) The load changes slowly, the peak current duration exceeds the previous provisions, and the equivalent constant DC current is the rated DC current; c) The standard working system level specified in GB/T3859.1 is shown in Table 3, and the load cycle is shown in Table 4. Note
1 The user should propose the standard working system level or load condition diagram when inquiring and ordering: 2 For the above load condition diagram, when the load current exceeds the nameplate rating, the current and temperature limits shall be in accordance with GB/T15164 and related standards. 4.7.2 Rated voltage U,
The grid side is excited by the AC power system, and its rated voltage U is in accordance with GB1094.1 and GB/T13499. The rated voltage on the valve side is the AC voltage determined by the maximum continuous operating DC voltage. When the converter is operated as an inverter (excitation) and a distorted waveform voltage is applied to the converter, the rated voltage U on the valve side is the AC voltage determined by the fundamental sinusoidal component (RMS value) in the Fourier spectrum of the maximum continuous operating voltage. 4.7.3 Rated current 1
The rated current I is the RMS value of the fundamental frequency sinusoidal component calculated according to the rated capacity in 4.7.1. 4
JB/T 86361997
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Nxa喜腿
Connection code
JB/T8636—1997
p60+(a+
Na鲁匾
Nxa腿
Connection code
JB/T8636—1997
2··s
or103
Duty level
JB/T8636—1997
Table 3 Standard duty level
Rated current of converter and test conditions of device (with Ian's standard Note: The current values exceeding the nameplate rating specified in Table 3 are applied after the rated current reaches a stable temperature. Table 4 Examples of load cycles (for reference in selecting duty levels) Duty levels
Most typical applications
Electrochemical processes, etc.
Electrochemical processes, etc.
Light industry and light traction station applications
Industrial applications Heavy loads
Medium traction stations And mining
Heavy traction station
Typical load conditions set according to the duty system level Load current is expressed as a ratio to the rated DC current value 1.0
JT1.5,min
10~12h
12~24h
10~12h
12~24h
I(pu)Tt（min）
t(min）
5 Voltage tapping range and level
JB/T8636—1997
5.1 The voltage tapping range of the off-excitation voltage-regulating transformer is ±5%, the grid-side winding It is advisable to use a tap with ±5%. 5.2 For transformers with on-load voltage regulation or voltage regulation with saturated reactors, the voltage regulation range and level are shown in the relevant standards. 6 Technical requirements for transformers
6.1 The following technical requirements shall comply with the relevant standards: a) Normal use conditions shall comply with GB1094.1 or GB6450; b) Temperature rise limit shall comply with GB1094.2 or GB6450; c) Short-circuit withstand capacity shall comply with GB1094.5; d) Nameplate load limit shall comply with GB/T13499 or relevant standards; e) Grid-side insulation level shall comply with GB1094.3 or GB6450. 6.2 Allowable deviation
The allowable deviation of technical parameters shall comply with the provisions of Table 5. Table 5
No-load loss
Load loss
No-load current
Impedance voltage
Transformation ratio
DC resistance unbalance rate
Allowable deviationbzxZ.net
See Note 2
The allowable deviation of the transformation ratio (rated tapping) of transformers with rated DC voltage of 250V and below is ±, range
All transformers
All transformers
All transformers
All transformers (rated tapping)
All transformers (rated tapping)
All transformers
The DC resistance unbalance rate of transformer products is not specified, but the manufacturer shall give the measured value and test temperature in the factory test record; 2
The allowable deviation of the total loss of the included balancing reactor is +30%; 3
The allowable deviation of the performance parameters of other included reactors can be found in the corresponding standards. 6.3
The insulation test voltage of the valve side winding and the internal reactor (if any) to the ground and between the branches shall be in accordance with Table 6, and the duration is 1minTable 6
Rated DC voltage
>100~800
>800~1250
>1250~2000
>2000~4000
7 Test
7.1 Test classification
External test voltage (RMS value) kv
Negotiated by the manufacturer and the user
The tests specified in this standard are divided into routine tests, type tests and special tests. 9
JB/T8636—1997
Routine tests are tests that every transformer should undergo. Type test is a test conducted on one transformer of each type, which is used to verify that transformers manufactured according to the same technical specifications should meet the requirements specified in addition to routine tests. When the structure, raw materials or process methods are changed, part or all of the type test should be repeated. Special test is a test that is different from both type test and routine test. It is determined by negotiation between the manufacturer and the user. 7.2 Test requirements
7.2.1 The general requirements for routine tests, type tests and special tests shall comply with the provisions of GB1094.1 or GB6450. 7.2.2 Routine test items and requirements
a) Winding resistance measurement (according to GB1094.1); b) Voltage ratio measurement and connection group number verification (according to GB1094.1); c) No-load current and no-load loss measurement (according to GB1094.1); d) Short-circuit impedance and load loss measurement (according to 8.1); e) Measurement of the insulation resistance of the winding to the ground and the dielectric loss factor (tan8) of the insulation system capacitance (according to GB/T6451 and GB/T10228);
f) Routine insulation test (according to GB1094.3 and GB645D, GB/T645 1, GB/T10228); g) Test of on-load tap-changer (according to GB1094.1) h) Test of insulating oil (according to GB1094.1)
i) Sealing test (according to GB6451)
i) Test of cooling device control box (according to relevant standards) k) Test of reactor (according to relevant standards)
7.2.3 Type test items and requirements
a) Determination of commutation reactance (according to 8.3)
b) Insulation type test (according to GB1094.3 and GB6450, GB/T6451, GB/T10228). 7.2.4 Special test items and requirements
a) Special insulation test (according to GB1094.3 and GB6450); b) Temperature rise test (according to 8.4);
c) Short circuit withstand capacity test (according to GB1094.5); d) Sound level measurement (according to GB/T7328)
If the user has other requirements (such as the test method is not in accordance with the provisions of this standard, or other test items are specified), it shall be in accordance with the provisions of the order contract. 8 Test method
Measurement of short-circuit impedance and load loss
Short-circuit impedance is measured under Ip current, with the winding terminals short-circuited as shown in column 17 of Table 2. The load loss is measured under rated current I1. Table 2 gives some suitable short-circuit connections for the test. The load loss measurement is the loss values PA, P and P measured under each short-circuit combination A, B and C. Calculated according to the formula in column 16 and corrected to the reference temperature, this value is the guaranteed value. Note: The short-circuit impedance value exN is the percentage of the inductive reactance component of the impedance voltage under the Ipn current on both sides. 8.2 The balancing reactor shall be subjected to the following routine tests, with the wiring shown in Figure 1: a) No-load test with 150 Hz and rated voltage between np; Note: If the experiment is carried out at other frequencies, the corresponding standard shall indicate the no-load loss at other frequencies. b) Measure the DC resistance between n-0 and p-0, and calculate its loss from the product of the sum of the DC resistance and the square of 1/2 rated DC current: c) Determine the change between n-0 and p-0 (if necessary). 10
8.3 Determination of commutation reactance
JB/T8636—1997
Short-circuit the grid-side terminals, pass the rated frequency AC current through the two adjacent windings of the same commutation group of the valve-side winding, measure the voltage between the terminals, calculate the impedance value from the measurement results, take its inductive reactance component to get the commutation reactance 2X1, counted by n, for the same commutation group, it should be at least twice on different winding pairs, and take the arithmetic mean of these measurement results as the measured commutation reactance value 8.4 Temperature rise test
8.4.1 Procedure for temperature rise test
a) Oil-immersed transformers shall be carried out in accordance with GB1094.2. b) Dry-type transformers shall be carried out in accordance with GB6450. However, the total loss and test current values applied shall be in accordance with 8.4.2 and 8.4.3. 8.4.2 Total losses
Total losses are calculated as the sum of the measured no-load losses and the load losses at reference temperature resulting from the rated distorted non-sinusoidal current (including losses of the internal resistance reactor in the case of oil-immersed inductors). Note: Due to the non-sinusoidal distorted waveform of the current, high-order harmonics increase the test current and total loss. The calculation method is shown in Appendix A (Standard Appendix) Appendix B (Suggestive Appendix)
8.4.3 Test current
The equivalent test current applied to the winding should be calculated according to the following formula: ILn(Rw+Rc)+(FwXPw)0.5
Two-winding transformer, Ie.=I,x[-
T,(Rw+Rc)+ PwE
Iww（Rw+Rc）+(FweXPwe）
Three-winding transformer: I=I,x[
'(R+Rc)+P）
Where: Ie. —Equivalent test current
I—Rated current fundamental component (RMS value), ILN—Rated non-sinusoidal line current (RMS value), obtained by calculation (see Appendix B); IwN—Rated current of the test winding (RMS value), obtained by calculation (see Appendix B); PE, winding eddy current loss under rated current I1; FwE--winding eddy current loss increase coefficient, obtained by calculation (see Appendix B); Rw—winding resistance value;
R. Connection line resistance value;
8.4.4 Double-winding transformer
For a double-winding transformer, if there are two secondary windings with the same capacity, rated voltage and impedance voltage arranged alternately, the two secondary terminals are short-circuited at the same time during the test, and a sinusoidal fundamental equivalent current 1e is applied to the primary winding to measure the winding temperature rise. 8.4.5 Multi-winding transformer
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