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DL/T 2043-2019: Technical specification for ±1100kV UHVDC converter transformers
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Technical specification for ±1100kV UHVDC converter transformers
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DL/T 2043-2019
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Basic data | Standard ID | DL/T 2043-2019 (DL/T2043-2019) | | Description (Translated English) | Technical specification for ��1100kV UHVDC converter transformers | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K41 | | Classification of International Standard | 29.180 | | Word Count Estimation | 31,367 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 1094.1; GB/T 1094.2; GB/T 1094.3-2017; GB/T 1094.4; GB/T 1094.5; GB/T 1094.7; GB/T 1094.10; GB 2536; GB/T 2900.33; GB/T 4109; GB/T 5273; GB/T 7354; GB/T 10230.1; GB/T 13498; GB/T 16927.1; GB 50150; DL/T 596; IEC 60815; IEC 60943; IEC 61378-2 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the operating conditions, rating and performance requirements, basic parameters, requirements for components, parts, insulating oil, etc., and other requirements and tests for converter transformers used in ��1100kV UHV DC transmission systems. This standard applies to single-phase dual-winding converter transformers for ��1100kV DC transmission systems with dual 12-pulse converters connected in series. | DL/T 2043-2019: Technical specification for ±1100kV UHVDC converter transformers---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.
Technical specification for ±1100kV UHVDC converter transformers
ICS 29.180
K 41
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
±1100kV UHV DC converter transformer
Technical conditions for use
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...Ⅱ
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Symbols...2
5 Conditions of use...2
6 Ratings and performance requirements...4
7 Basic parameters...6
8 Requirements for components, parts, insulating oil, etc...8
9 Other requirements...13
10 Test...14
Appendix A (Informative Appendix) Ratings and Technical Parameters of Converter Transformers...25
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the High Voltage Direct Current Transmission Technology Standardization Technical Committee of the Power Industry.
Drafting organization of this standard. State Grid Economic and Technical Research Institute Co., Ltd.
The main drafters of this standard. Zhao Zheng, Le Bo, He Li, Chen Dong, Ma Weimin, Mei Nian, Xue Yinglin, Li Tan, Chen Zhao, Li Xuan, Fu Ying,
I wish Quanle, Wang Tao and Xu Zhongli.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (Baiguang, Xuanwu District, Beijing)
Lu Er Tiao No. 1, 100761).
1 Scope
This standard specifies the operating conditions, rated values and performance requirements, basic requirements for converter transformers used in ±1100kV UHV DC transmission systems.
Parameters, component requirements, other requirements and technical conditions for testing.
This standard is applicable to single-phase dual-winding converter transformers for DC transmission systems with dual 12-pulse converters in series.
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 document.
For undated references, the latest version (including all amendments) applies to this document.
GB 1094.1 Power Transformer Part 1.General Rules
GB 1094.2 Power Transformer Part 2.Temperature rise of liquid immersed transformer
GB/T 1094.3-2017 Power Transformer Part 3.Insulation Level, Insulation Test and External Insulation Air Gap
GB/T 1094.4 Power Transformer Part 4.Lightning Impulse and Operation Impulse Test Guide for Power Transformer and Reactor
GB 1094.5 Power Transformer Part 5.Ability to withstand short circuit
GB/T 1094.7 Power Transformer Part 7.Load Guidelines for Oil-immersed Power Transformer
GB/T 1094.10 Power Transformer Part 10.Sound Level Measurement
GB 2536 Unused mineral insulating oil for electrical fluid transformers and switches
GB/T 2900.33 Electrical Engineering Terminology Power Electronic Technology
GB/T 4109 Insulating bushings with AC voltage higher than 1000V
GB/T 5273 Standardization of terminal size for high voltage electrical appliances
GB/T 7354 Partial discharge measurement
GB 10230.1 Tap Changer Part 1.Performance Requirements and Test Methods
GB/T 13498 Terminology for High Voltage Direct Current Transmission
GB/T 16927.1 High Voltage Test Technology Part 1.General Definition and Test Requirements
GB 50150 Electrical equipment installation engineering electrical equipment handover test standard
DL/T 596 Preventive test procedures for electrical equipment
3 Terms and definitions
The terms and definitions defined in GB/T 2900.33 and GB/T 13498 apply to this standard.
4 symbols
The following symbols apply to this document.
f1.Rated frequency, namely the fundamental frequency
fx. frequency used to determine the distribution of eddy current loss
fh. frequency of h harmonic
FSE. additional coefficient of stray loss in structural parts
FWE. additional coefficient of winding eddy current loss
h. harmonic order
I1.Rated current
Ix. Load loss test current at frequency fx
ILN. The root mean square value of the load current when the winding under consideration is running
Ih. h harmonic current
Ieq. The root mean square value of the sinusoidal current equivalent to the load loss of the winding in operation
I12R. Resistance loss under rated current
kh. the ratio of current Ih to rated current I1
N. The number of six-pulse bridges connected in series from the neutral point of the DC line to the rectifier bridge connected to the transformer
P1.Total load loss under fundamental frequency (50Hz)
PN. total operating load loss
Px. Load loss measured at frequency fx
PSE1.Stray loss in structural parts (excluding windings) at the fundamental frequency
PWE1.Winding eddy current loss at fundamental frequency
R. DC resistance of windings including internal leads
SR. Rated capacity
U1.Rated voltage
Uac. Externally applied AC test voltage of the valve side winding (root mean square value)
Udm. the highest DC voltage of each valve bridge
Udc. applied DC test voltage of the valve side winding
Um. the highest system voltage of the grid side winding
Upr. Polarity reversal test voltage of valve side winding (DC voltage)
Uvm. the maximum phase-to-phase AC working voltage of the valve side winding of the converter transformer
Note. "Valve side" and "Grid side" indicate the external wiring of the converter transformer windings. The grid-side winding refers to the winding connected to the AC grid, while the valve-side winding refers to the winding
Connect to the winding of the converter valve or converter.
5 Conditions of use
5.1 General provisions
The converter transformer in this standard should meet the conditions of use specified in GB 1094.1, but it is obviously not applicable to converter transformers or
Unless otherwise specified in this standard. Unless otherwise stated, it is assumed that the converter transformer is operated in an approximately symmetrical three-phase system.
5.2 Altitude
The altitude should not exceed 1000m, and should be corrected in accordance with the relevant requirements in GB 1094.1 when it exceeds.
5.3 Ambient temperature
The ambient temperature of the transformer should meet the following requirements.
a) Maximum temperature. +40℃;
b) Average temperature of the hottest month. +30℃;
c) The highest annual average temperature. +20℃;
d) Minimum temperature. -45℃ (applicable to outdoor converter transformers).
5.4 Ice thickness
The transformer should be able to be used at a height of 10m from the ground under the condition of ice thickness that is once in 50 years.
5.5 Wind speed
The transformer should be able to be used at a height of 10m above the ground and an average wind speed of 10min.
5.6 Sunlight intensity
The transformer should be able to be used under the sunshine intensity condition when the wind speed is 0.5m/s.
5.7 Installation environment
The installation environment of the transformer should meet the following conditions.
a) Pollution level. d and below;
b) Ground acceleration caused by the earthquake. the horizontal direction is less than 3m/s2; the vertical direction is less than 2m/s2.
5.8 System conditions
The system conditions should meet the following requirements.
a) The waveform of the grid-side power supply voltage is similar to a sine wave. At the same time, the total harmonic content in the distorted waveform is not more than 5%, and even harmonics contain
The amount is not more than 1%.
b) Refer to Appendix A for the recommended values of system conditions.
5.9 Special conditions of use
5.9.1 Special conditions of use other than the specified normal conditions of use shall be stated in the inquiry and ordering (see GB 1094.1).
5.9.2 Under special conditions of use, the rated value and test rules of the converter transformer are specified as follows.
a) The temperature rise in higher ambient temperature or high altitude environment should refer to the corresponding regulations of GB 1094.2;
b) External insulation in high altitude environments should refer to the corresponding regulations in GB/T 1094.3.
5.10 Load current
The current flowing through the converter transformer contains fundamental wave, harmonic and DC bias current. The converter transformer should be able to provide the harmonic components and direct
Use under the condition of the magnitude of the bias current.
5.11 Power flow
Unless otherwise specified, the converter transformer should be designed to be used for both rectification operation and inverter operation.
6 Ratings and performance requirements
6.1 General requirements
The rated parameters of the converter transformer are represented by the steady-state sine quantities of current and voltage at the rated fundamental frequency. Guaranteed loss, impedance and
The sound level should correspond to the rated parameter value.
6.2 Rated voltage
The rated voltage is the root mean square value of the fundamental component of the phase-to-phase voltage.
6.3 Rated current
The rated current is the root mean square value of the fundamental wave component of the line current.
6.4 Rated frequency
The rated frequency is the fundamental frequency of 50 Hz on which the converter transformer is designed.
6.5 Rated capacity
The rated capacity is the product of the rated voltage and the rated current, and the three-phase rated capacity is shown in formula (1).
6.6 Insulation level
6.6.1 Grid side winding
The insulation of the winding ends and the neutral point shall be in accordance with the provisions of GB/T 1094.3, and the following insulation levels shall be determined.
a) The highest voltage of the windings of the converter transformer, Um;
b) Rated lightning and operating impulse withstand voltage (relative to ground);
c) Short-term power frequency withstand voltage;
d) The applied AC test voltage corresponding to the neutral point insulation level;
e) Induced voltage tolerance level with partial discharge measurement. it should be based on the highest voltage Um of the equipment on the grid side winding, refer to GB/T 1094.3
Determine the test procedure and voltage withstand level.
6.6.2 Valve side winding
The lightning and operating shock levels should be determined with reference to Appendix A of this standard.
6.6.3 Lightning impulse voltage tolerance level
The lightning impulse voltage withstand level between each terminal of the valve side winding and the two ends of the winding should be specified.
6.6.4 Operating impulse voltage tolerance level
The operating impulse voltage tolerance level of each terminal of the valve side winding to the ground shall be specified.
6.6.5 Applied DC voltage tolerance level
The test voltage shall be of positive polarity and shall be applied to both terminals of the valve side winding at the same time. The test voltage should be calculated by formula (2).
6.6.6 Polarity reversal voltage tolerance level
The test voltage shall be applied to both terminals of the valve side winding at the same time. The test voltage is calculated by formula (3).
6.6.7 Withstand level of applied AC voltage
The test voltage shall be applied to both terminals of the valve side winding at the same time. The test voltage is calculated by formula (4) (root mean square value).
6.7 Radio interference level
The radio interference voltage at 1.1 times the highest operating voltage is not more than 500μV, and there is no visible corona on a clear day and night.
6.8 Noise level
6.8.1 The noise level of the converter transformer shall meet the following general requirements.
a) When determining the noise level, attention should be paid to the sound power level of the converter transformer under on-site load conditions and the sound generated during the no-load test.
The difference in power level;
b) The user should negotiate the sound level measurement method with the manufacturer to simulate the actual current in the operation of the converter transformer.
6.8.2 The guaranteed sound power level or sound pressure level shall meet the following requirements.
a) When ordering, the guaranteed sound pressure level (sound pressure level or sound intensity level) and the corresponding sound power level should be clearly specified;
b) Because this sound power level is different from the value obtained under on-site load conditions, the user generally stipulates that the
The maximum sound power level of the converter transformer obtained under load conditions, or the user and the manufacturer jointly negotiate this sound power level.
Note. The sound power level is based on sinusoidal no-load excitation or sinusoidal load current excitation.
6.8.3 The on-site sound power level shall meet the following requirements.
a) The difference between the sound level of the converter transformer measured by the manufacturer and the sound level measured on site may be 10dB(A) to 20dB(A)
between;
b) The user can also negotiate with the manufacturer to determine the sound power level or sound level (sound pressure level).
c) The sound level (sound pressure level) of the converter transformer under the rated DC current and the harmonic current given by the user should not be greater than 80 dB(A).
6.9 Loss
6.9.1 General requirements
The total loss of the converter transformer should be equal to the sum of the no-load loss and the load loss under rated operating conditions.
Within the deviation range specified by the process.
6.9.2 No-load loss
The measurement of no-load loss and no-load current of the converter transformer shall be carried out in accordance with the provisions of GB 1094.1.
6.9.3 Load loss under rated power frequency conditions
The load loss shall be measured in accordance with the provisions of GB 1094.1 and this standard.
6.9.4 Load loss under operating conditions
6.9.4.1 The load loss under the operating conditions of the converter transformer shall meet the following requirements.
a) The manufacturer should calculate the total load loss value in actual operation according to the harmonic spectrum of the given load current;
b) The harmonic spectrum should be provided by the user;
c) The calculation should be performed separately for main tapping and limit tapping;
d) The calculated loss value can be used as a guaranteed reference value for loss evaluation;
e) According to IEC 61378-2 and other standards.
1) Assuming that eddy current loss and stray loss are proportional to the square of the current;
2) Assuming that the winding eddy current loss is proportional to the second power of frequency, the stray loss in the structure is proportional to the 0.8 power of frequency.
6.9.4.2 The relationship between eddy current loss and stray loss, current and frequency is shown in equation (5).
6.9.4.3 According to the given harmonic spectrum, the total load loss in operation is calculated by equation (6).
6.9.5 Hot spot temperature determination
The method of determining the hot spot temperature should be calculated according to the temperature field. For a given harmonic spectrum in the load current, the additional eddy current loss should be calculated
The coefficient is used to compensate that the hot spot temperature rise determined by the calculation method of GB/T 1094.7 may be different from the value obtained during normal operation.
7 Basic parameters
7.1 Type
Should be single-phase, dual-winding, on-load voltage regulation, oil-immersed.
7.2 Location of use
Should be outdoor.
7.3 Cooling method
Should be forced guided oil circulation air cooling (ODAF) or forced oil circulation air cooling (OFAF).
7.4 Rated frequency
Should be 50Hz.
7.5 Rated capacity
It should be determined according to the specific project.
7.6 Rated voltage
It should be determined according to the specific project.
7.7 Rated voltage ratio
It should be determined according to the specific project.
7.8 Pressure regulation method
The pressure regulation method adopts the on-load pressure regulation, and the pressure regulation position is placed at the neutral point of the network side.
7.9 Neutral point grounding method
The neutral point on the grid side is directly grounded, and the neutral point on the valve side is not grounded.
7.10 Connection group label
Should be IiO (three-phase group. YNynO or YNd11).
7.11 Load capacity
7.11.1 The load capacity of the converter transformer should meet the requirements of GB/T 1094.7, and the manufacturer should provide the transformer load capacity calculation institute
Required thermal characteristics.
7.11.2 The load capacity of the converter transformer should meet the requirements of the specific project.
7.12 Short circuit withstand capability
7.12.1 When an outlet short circuit occurs at any end of the converter transformer, it can maintain dynamic and thermal stability without damage.
7.12.2 The converter transformer of the manufacturer shall meet the requirements of GB 1094.5, and shall provide the calculation results of winding dynamic and thermal stability during short-circuit
And calculation report, the short-circuit duration of thermal stability should not be less than 2s.
7.13 Short circuit impedance
The value of Uk ranges from 20% to 23%, which is determined by the specific project.
7.14 Short-circuit impedance deviation
7.14.1 For converter transformers whose tapping range does not exceed 30%, the allowable deviation of impedance under the main tap is ±3.75%. Impedance value under main tap
Should be guaranteed. The impedance values at other tap positions should also be guaranteed to comply with the agreement between the user and the manufacturer or meet the requirements in Table 1.
7.14.2 For converter transformers with a tapping range exceeding 30%, the impedance deviation within the tapping range shall be signed by the user and the manufacturer
Negotiate before.
7.14.3 For the same or similar converter transformers designed for the same purpose or interchangeable, each transformer shall be
The impedance change should not exceed ±2% of its average measured value.
7.15 Temperature rise limit
The temperature rise of the converter transformer should meet the following requirements.
a) Top oil temperature rise. 45K;
b) Average temperature rise of winding. 53K;
c) Winding hot spot temperature rise. 66K;
d) Temperature rise of fuel tank and structural parts. 75K;
e) Hot spot temperature of short-time overload winding. 120℃.
Note. The above values are the factory test temperature rise limits, and the difference between factory test conditions and on-site operating conditions has been considered.
7.16 DC bias current
Determined according to the specific project, but each unit should not be less than 10A/phase.
7.17 Winding rated insulation level
The rated insulation level of the converter transformer windings is determined by the specific project. See Appendix A for typical values.
8 Requirements for components, parts, insulating oil, etc.
8.1 Casing
8.1.1 Type
The type of converter transformer should meet the following requirements.
a) If the grid-side casing uses oil-immersed casing, an oil level indicator that is easy to check the oil level from the ground should be installed; the valve-side casing should use a dry casing
The tube, if filled with SF6, should be equipped with a pressure gauge;
b) The color of porcelain casing should be brown, and the color of non-porcelain casing should be gray;
c) In actual engineering, the specific structure of the casing is determined according to the engineering.
8.1.2 Rated insulation level
The rated insulation level of the converter transformer bushing should meet the following requirements.
a) The rated insulation level of the grid-side bushing of the converter transformer should be in accordance with GB/T 4109.
b) The insulation level of the valve-side bushing of the converter transformer should be improved by a different coefficient than the insulation level of the valve-side winding of the converter transformer (neutral point set
Except tube). Among them, DC voltage. 1.15; DC polarity reversal. 1.15; applied AC voltage. 1.10; lightning impact.
1.10; Operational shock. 1.10.
c) The valve-side bushing of high-end converter transformers does not carry out the power frequency 1min short-term withstand test, and uses the external AC long-term withstand test instead.
8.1.3 Bushing creepage distance
The bushing creepage distance of the converter transformer should meet the following requirements.
a) The minimum creepage distance between the wire ends of the grid side and the neutral point bushing should not be less than 25 mm/kV;
b) When calculating the climbing distance, the diameter coefficient should be corrected;
c) The bushing should meet the creepage coefficient (ie. creepage distance/dry arc distance) not greater than 4.0;
d) The minimum creepage distance of the valve side casing should not be less than 14mm/kV;
e) The creepage factor, shape factor, diameter factor and parameters representing the shape of the umbrella skirt shall all comply with the requirements of IEC 60815.
8.1.4 Sleeve terminal
The bushing terminal of the converter transformer shall meet the following requirements.
a) The type and size of the casing terminal should meet the relevant regulations in the GB/T 5273 standard, and have a reliable anti-rust layer;
b) The terminal board should be able to withstand the corresponding stress requirements in Appendix A, and the contact surface of the terminal board should be silver-plated;
c) The allowable load of the casing terminal (continuous operation) is determined according to the actual design of the specific project, and the typical value is shown in Appendix A;
d) Under the maximum ambient temperature specified in the specific project, the temperature of the winding terminals of the converter transformer should not exceed the relevant regulations of IEC 60943.
set;
e) The equalizing outlet terminal at the end of the bushing on the grid side should be designed according to the requirements of anti-corona.
8.1.5 Test
The test and other performance requirements of the casing shall comply with GB/T 4109 and IEC 65700.
8.1.6 Current transformer
The current transformer of the converter transformer shall meet the following requirements.
a) The transformation ratio of all current transformers should be listed on the nameplate of the converter transformer;
b) The secondary lead of the current transformer should be led to the terminal board of the converter transformer control cabinet through the metal shielded pipe, and the lead should be of cross-section
Oil-resistant and heat-resistant flexible cord not less than 4mm2;
c) Determined according to the specific project, see Appendix A for the typical configuration parameter table.
8.1.7 Valve side casing divider
Determined according to the specific project, see Appendix A for the typical configuration parameter table.
8.2 On-load tap-changer
8.2.1 Rated current
When selecting the rated current of the on-load switch, the harmonic current and a certain overload capacity should be considered, and should meet the requirements of GB 10230.1
The requirements of the switch.
8.2.2 Pressure regulating range
Determined according to specific engineering design.
8.2.3 Performance requirements
The converter transformer should meet the following performance requirements.
a) The mechanical life of the on-load tap-changer shall not be less than 800,000 times (oil-immersed type), 1 million times (vacuum bubble type);
b) The electrical life of the on-load tap-changer is not less than.200,000 times (oil-immersed type) and 300,000 times (vacuum bubble type);
c) The maintenance/oil change cycle of the on-load tap-changer shall not be less than 100,000 times;
d) The long-term current-carrying contacts of the on-load tap-changer should be able to withstand the external short-circuit current for 1s, and the contacts should not be welded, burned,
There is no mechanical deformation, and it can continue to run;
e) For the long-term current-carrying contacts of the on-load tap-changer, the stable temperature rise of the converter transformer oil does not exceed 20K at 1.2 times the rated current;
f) The oil tank of the on-load tap-changer should be able to withstand the oil pressure test at a pressure of 0.05 MPa, and there should be no leakage after 1 hour.
8.2.4 Structural requirements
8.2.4.1 The on-load tap-changer shall be equipped with an online oil filter.
8.2.4.2 The structure of the on-load tap-changer shall meet the following requirements.
a) ...
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