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DL/T 1998-2019: (Technical conditions for the use of induction filter transformers)
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(Technical conditions for the use of induction filter transformers)
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DL/T 1998-2019
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Standard similar to DL/T 1998-2019 DL/T 5168 Basic data | Standard ID | DL/T 1998-2019 (DL/T1998-2019) | | Description (Translated English) | (Technical conditions for the use of induction filter transformers) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Word Count Estimation | 33,319 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | DL/T 1998-2019: (Technical conditions for the use of induction filter 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 specifications for inductive filtering transformer equipment
ICS 29.180
K 41
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Technical conditions for the use of inductive filter transformer complete equipment
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...2
4 Abbreviations...3
5 Working principle...3
6 Conditions of use...4
7 Technical requirements...4
8 Test...6
9 Operation and maintenance...9
10 Marking, packaging, lifting, transportation and storage...9
Appendix A (Normative Appendix) Calculation method of equivalent short-circuit impedance of induction filter winding in multi-winding transformer...10
Appendix B (Informative Appendix) Principles of Induction Filtering...12
Appendix C (Normative Appendix) Design Steps for Complete Set of Induction Filter Transformer Equipment...25
Foreword
This standard is compiled in accordance with the rules of GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Compilation".
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Power Transformer Standardization Technical Committee (DL/T C 02) of the power industry.
Drafting organizations of this standard. State Grid Hunan Electric Power Co., Ltd., Hunan University, State Grid Hunan Electric Power Research Institute,
State Grid Hunan Electric Power Co., Ltd. Maintenance Company, Hunan Huada Unisplendour Technology Co., Ltd., China Electric Power Research Institute Co., Ltd.,
State Grid Electric Power Research Institute Wuhan Nanrui Co., Ltd., TBEA Hengyang Transformer Co., Ltd.
The main drafters of this standard. Zhou Guandong, Chen Yuehui, Pan Liqiang, Luo Longfu, Zhang Zhiwen, Wang Xiaofei, Liu Weidong, Yu Hao, Yan Wenjiao,
Zhang Shuzhen, Guan Jianxin, Zhao Kun, Liu Guoxun.
This standard was issued for the first time.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing)
No. 1, 100761).
Technical conditions for the use of inductive filter transformer complete equipment
1 Scope
This standard specifies the terms and definitions, abbreviations, working principles,
Use conditions, technical requirements, test items and methods, operation and maintenance, as well as nameplates, transportation and storage, etc.
This standard applies to the design of complete sets of equipment with a nominal voltage of 6kV to 220kV on the high-voltage side of an induction filter transformer and a rated capacity of 5MVA and above.
Manufacturing, ordering and use.
2 Normative references
The following documents are indispensable for the application of this standard. For dated reference documents, only the dated version applies to this standard
quasi. For undated reference documents, the latest version (including all amendments) is applicable to this standard.
GB 1094.1 Power Transformer Part 1 General Rules
GB 1094.2 Power Transformer Part 2 Temperature Rise of Liquid-immersed Transformer
GB 1094.5 Power Transformer Part 5 Ability to withstand short circuit
GB/T 1094.6 Power Transformer Part 6 Reactor
GB 1094.11 Power Transformer Part 11 Dry-type Transformer
GB 20840 Transformer
GB 1984 AC high voltage circuit breaker
GB 1985 High voltage AC isolation switch and grounding switch
GB/T 6451 Oil-immersed power transformer technical parameters and requirements
GB/T 10228 Dry-type power transformer technical parameters and requirements
GB/T 11024.1～11024.4 Shunt capacitors for AC power systems with nominal voltages above 1000V
GB 11032 AC gapless metal oxide surge arrester
GB/T 13729 Telecontrol terminal equipment
GB/T 17626.7 Electromagnetic compatibility test and measurement technology Power supply system and connected equipment harmonic, interharmonic wave measurement and measuring instrument
Guidelines
GB/T 19862 General requirements for power quality monitoring equipment
GB/T 26868 Guidelines for the Design and Application of High-Voltage Filtering Devices
GB 50150 Electrical equipment installation engineering electrical equipment handover test standard
DL/T 393 Power transmission and transformation equipment condition inspection and repair test procedure
DL/T 572 Power Transformer Operation Regulations
DL/T 573 Power Transformer Maintenance Guide
DL/T 596 Preventive test procedures for electrical equipment
DL/T 672 Technical conditions for ordering voltage and reactive power adjustment control devices of substations
JB/T 10931 High-voltage power filter device
SD 325 Technical Guidelines for Power System Voltage and Reactive Power
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Inductive filtering
A way to filter out harmonics by adding special windings to the transformer.
3.2
Inductive filtering winding
In the transformer, the added equivalent short-circuit impedance percentage is close to zero to connect the winding of the tuning and reactive power compensation device.
3.3
Inductive filtering transformer (iFT)
Transformer with inductive filter winding.
3.4
Tuning and var compensating installation (iTVC)
Composed of capacitors and reactors, etc., connected to the transformer induction filter windings to provide near-zero impedance for harmonic currents of specific frequencies
Path, a combination of equipment with reactive power compensation functions.
3.5
Inductive filtering control system (iFC)
An integrated software and hardware system for monitoring and controlling the induction filter transformer (iFT) and the tuning and reactive power compensation device (iTVC).
3.6
Inductive filtering transformer equipment
The complete set of equipment consists of an induction filter transformer (iFT), a tuning and reactive power compensation device (iTVC) and a monitoring system (iFC).
3.7
Tuned branch
A circuit mainly composed of reactors (L), capacitors (C), etc., which presents low impedance to specific harmonics. Compensable for fundamental wave
Capacitive reactive power.
3.8
Rated capacity of inductive filtering transformer equipment
The rated capacity of the induction filter transformer.
4 Abbreviations
The following acronyms apply to this standard.
AGC. automatic generation control (automatic generation control)
AVC. automatic voltage control (automatic voltage control)
5 working principle
5.1 Inductive filtering realization method
By adding a winding to the transformer core, and together with the external tuning branch to form a loop with an impedance approaching zero at a specific frequency,
To suppress the harmonic main magnetic flux in the iron core, the total impedance of the harmonic current loop should be as small as possible.
5.2 Connection mode of complete equipment
The connection diagram of a typical three-winding induction filter transformer complete set of equipment is shown in Figure 1.
5.3 Induction filter transformer winding arrangement
The position of the transformer induction filter winding should be set between the high-voltage winding and the low-voltage winding. The induction of a typical three-winding induction filter transformer
The location of the filter winding is shown in Figure 2.
Figure 2 Schematic diagram of the location of the induction filter winding of a typical three-winding transformer
6 Conditions of use
The use conditions of the components of the complete set of equipment should comply with the relevant standards.
a) The induction filter transformer should meet the requirements of GB 1094.1, GB 1094.11 or DL/T 941;
b) The tuning and reactive power compensation device should meet the requirements of JB/T 10931;
c) The induction filter monitoring system should meet the requirements of GB/T 19862.
7 Technical requirements
7.1 General provisions
The performance parameters and technical requirements of each component of the complete set of equipment shall comply with the relevant standards.
a) The induction filter transformer should meet the requirements of GB/T 6451 or GB/T 10228, and the user should provide the harmonic content and
Current size
b) Tuning and reactive power compensation devices should comply with GB/T 1094.6, GB/T 11024.1～11024.4, GB/T 26868 and JB/T 10931
Provisions;
c) The induction filter monitoring system should meet the requirements of GB/T 13729, GB/T 19862 and DL/T 672.
7.2 Induction filter transformer
7.2.1 Rated voltage of induction filter winding
The rated voltage of the induction filter winding should be selected according to the relevant national and industry standards and actual needs.
7.2.2 Rated capacity of induction filter winding
The rated capacity of the induction filter winding should be selected at least 1.2 times the fundamental wave capacity of the tuning and reactive power compensation device.
7.2.3 Rated frequency
The rated frequency of the induction filter transformer should be 50Hz.
7.2.4 Winding connection mode
When the high-voltage winding and low-voltage winding of the induction filter transformer adopt Y-connection at the same time, the induction filter winding should adopt D-connection.
7.2.5 Percentage of equivalent short-circuit impedance
The equivalent short-circuit impedance percentage (absolute value) of the induction filter winding should not be greater than 0.1%.
7.2.6 Ability of winding to withstand short circuit
The ability of windings to withstand short circuits should meet the requirements of GB 1094.5.
7.2.7 Temperature rise of induction filter winding
The temperature rise of the induction filter winding should consider the loss caused by harmonics, and the temperature rise limit should meet the requirements of GB 1094.2 or GB 1094.11.
7.2.8 Other
Except 7.2.1～7.2.7, other requirements shall comply with GB/T 6451 or GB/T 10228.
7.3 Tuning and reactive power compensation device
7.3.1 Tuning branch and capacity calculation
The tuning branch and capacity calculation should be based on the harmonic characteristics of the current flowing into the transformer to determine the tuning frequency and the number of branches, tuning and reactive power compensation equipment
The set fundamental reactive power capacity and the distribution of the branch capacity should meet the requirements of GB/T 26868.
7.3.2 Reactor
The technical performance of the reactor selected for the tuning and reactive power compensation device should meet the requirements of GB/T 1094.6.Reactor should adopt adjustable sense
Form, the tuning range should be determined according to the capacitance deviation of the capacitor bank. The quality factor of the reactor should meet the requirements of Table 1.
7.3.3 Capacitor
The technical performance of the capacitor selected for the tuning and reactive power compensation device should meet the requirements of GB/T 11024.1 ~ 11024.4.
7.4 Induction filter monitoring system
7.4.1 System composition
The inductive filtering monitoring system consists of a power quality monitoring system, a comprehensive control device for voltage and power, and remote control terminal equipment.
7.4.2 Main technical requirements
1.1.1.1 7.4.2.1 The system shall have the functions of power quality monitoring, automatic voltage adjustment, system power optimization control and telecontrol communication.
1.1.1.2 7.4.2.2 Module composition includes power quality monitoring, induction filter transformer gear measurement and adjustment, voltage power optimization control,
Modules such as telecontrol communication.
1.1.1.3 7.4.2.3 The control objectives shall meet the following requirements.
a) Telecontrol communication should comply with GB/T 13729;
b) The voltage and power integrated control device selected should meet the requirements of new energy power plants (such as wind power generation, photovoltaic power generation, etc.) for active, reactive, and
Regulation and control requirements for voltage and generator running status (with AVC and AGC functions).
7.4.2.4 Accuracy.
a) Voltage level 0.5;
b) Current 0.5 level.
7.5 Other equipment
7.5.1 Circuit breaker
The circuit breaker should meet the requirements of GB 1984.
7.5.2 Isolating switch
The isolation switch should meet the requirements of GB 1985.
7.5.3 Lightning arrester
The arrester should meet the requirements of GB 11032.
7.5.4 Transformer
The transformer should meet the requirements of GB 20840.
8 test
8.1 General provisions
The equipment test is divided into five categories. routine test, type test, special test, handover test and field test. Complete sets of equipment and various components
The test shall not only meet the requirements of the relevant standards of each component, but also meet the requirements of this standard. The test items and requirements are shown in Table 2.
8.2 Routine test
8.2.1 Routine test items and methods of each component of the complete set of equipment
The routine test items and methods of each component of the complete set of equipment should comply with the relevant standards.
a) The induction filter transformer should meet the requirements of GB 1094.1 and GB 1094.11;
b) The tuning and reactive power compensation device should meet the requirements of GB/T 26868;
c) The induction filter monitoring system should meet the requirements of GB/T 19862;
d) The circuit breaker should meet the requirements of GB 1984;
e) The isolating switch should meet the requirements of GB 1985;
f) The arrester should meet the requirements of GB 11032;
g) Current transformers should meet the requirements of GB 1208, and voltage transformers should meet the requirements of GB 1207 or GB/T 4703.
8.2.2 Short-circuit impedance and load loss measurement of induction filter transformer
The measurement of the short-circuit impedance and load loss of the induction filter transformer should meet the requirements of GB 1094.1, and the test current value should be the power frequency equivalent current.
The current value, the power frequency equivalent current value is calculated according to formula (1). The equivalent short-circuit impedance percentage (absolute value) of the induction filter winding has been tested and calculated
The result obtained should meet the requirements of 7.2.5, and the calculation method of the equivalent short-circuit impedance percentage of the induction filter winding should meet the requirements of Appendix A.
8.2.3 Loss and quality factor measurement of reactor
The loss and quality factor measurement of the reactor should meet the requirements of GB/T 1094.6.
8.2.4 Harmonic current and harmonic voltage accuracy verification of the induction filter monitoring system
The accuracy verification of the harmonic current and harmonic voltage of the induction filter monitoring system shall meet the requirements of GB/T 19862.
8.3 Type test
8.3.1 Type test items and methods for each component of the complete set of equipment
The type test items and methods of each component of the complete set of equipment should comply with the relevant standards.
a) The induction filter transformer should meet the requirements of GB 1094.1 and GB 1094.11;
b) The tuning and reactive power compensation device should meet the requirements of GB/T 26868;
c) The induction filter monitoring system should meet the requirements of GB/T 19862;
d) The circuit breaker should meet the requirements of GB 1984;
e) The isolating switch should meet the requirements of GB 1985;
f) The arrester should meet the requirements of GB 11032.
g) The transformer should meet the requirements of GB 20840.
8.3.2 Temperature rise test of induction filter transformer
The temperature rise test shall meet the requirements of GB 1094.2 or GB 1094.11.When the temperature rise test is carried out by the short circuit method, the load loss shall be in accordance with 8.2.2
Calculation.
8.3.3 Loss and quality factor measurement of reactor
The loss and quality factor measurement of the reactor should meet the requirements of GB/T 1094.6.
8.3.4 Temperature rise test of reactor
The temperature rise test of the reactor should meet the requirements of GB/T 1094.6, the test current value should be the power frequency equivalent current value, and the power frequency equivalent current value should be
Formula (1) calculation.
8.4 Special test
The special test items and methods of the induction filter transformer should meet the requirements of GB 1094.1 and GB 1094.11.
8.5 Handover test
8.5.1 Handover test of each component of the complete set of equipment
The handover test of each component of the complete set of equipment should meet the requirements of GB 50150, and the handover test of the induction filter monitoring system should also comply with
GB/T 13729 and GB/T 19862 regulations. After the complete set of equipment is put into operation, the system harmonics, voltage, power factor and monitoring functions should also be checked
test.
8.5.2 Harmonic measurement of complete equipment
The method of measuring the harmonic voltage of the system or the harmonic current of the user-specified test point should meet the requirements of GB/T 17626.7.
8.5.3 Voltage and power factor measurement of complete equipment
The voltage and power factor measurement of the complete set of equipment should comply with SD 325, and the power factor should meet the requirements of the user's ordering technical conditions.
8.5.4 Inspection of complete equipment control functions
The control function inspection of the complete set of equipment should be able to realize the gear adjustment and tuning of the induction filter transformer and the control of the reactive power compensation device. control
The function should comply with the provisions of GB/T 13729.
8.5.5 Inspection of complete equipment monitoring function
The inspection of the complete set of equipment monitoring functions shall meet the requirements of GB/T 19862.
8.5.6 Inspection of remote control and communication functions of complete sets of equipment
The remote control and communication function inspection of the complete set of equipment shall meet the requirements of GB/T 13729.
8.6 Field test
The field test of each component of the complete set of equipment should meet the requirements of DL/T 393, and the field test of the induction filter monitoring system should also meet
GB/T 13729 and GB/T 19862 regulations.
9 Operation and maintenance
The operation and maintenance of the components of the complete set of equipment shall be implemented in accordance with the provisions of the relevant standards.
a) The induction filter transformer should comply with DL/T 393, DL/T 572, DL/T 573 and DL/T 596;
b) The tuning and reactive power compensation device should be in accordance with GB/T 26868.
10 Marking, packaging, lifting, transportation and storage
The marking, packaging, lifting, transportation and storage of each component of the complete set of equipment shall comply with the relevant standards.
a) The induction filter transformer should meet the requirements of GB/T 6451 or GB/T 10228;
b) The tuning and reactive power compensation device should meet the requirements of JB/T 10931;
c) The induction filter monitoring system should meet the requirements of GB/T 13729.
Appendix A
(Normative appendix)
Calculation method of equivalent short-circuit impedance of induction filter winding in multi-winding transformer
A.1 Three-winding transformer
For a three-winding transformer, the equivalent short-circuit impedance of the induction filter winding 3 should be calculated according to formula (A.1).
A.2 Four-winding transformer
For a four-winding transformer, the equivalent short-circuit impedance of the induction filter winding 4 should be calculated according to formula (A.3).
Appendix B
(Informative appendix)
Inductive filtering principle
B.1 Inductive filtering theory
B.1.1 Definition of induction filter
Inductive filtering is a method of filtering through the principle of electromagnetic induction. By adding a set of windings with equivalent impedance to zero in the transformer windings
Group, externally connected with a specific order fully tuned LC filter branch to form a corresponding sub-harmonic short-circuit loop. When there is harmonic current in the load winding,
The principle of magnetic induction, the corresponding sub-harmonic current will be induced in the harmonic short-circuit loop, and the harmonic magnetomotive force and load generated by the current in the additional winding
The harmonic magnetomotive force in the windings is equal in magnitude and opposite in direction, so that the specific sub-harmonic magnetomotive force and harmonic current in the primary winding are greatly reduced.
Achieve good suppression of harmonics.
B.1.2 Inductive filtering theory
B.1.2.1 Basic topology of single-phase induction filter transformer
The basic structure of the single-phase induction filter transformer is shown in Figure B.1(a). In Figure B.1(a), the transformer consists of an iron core, a primary winding W1, and a secondary
The windings W2 and W3 are composed. W1 winding is connected to the power source, called power winding; W2 winding is connected to induction filter, called filter winding; W3 winding is connected
Non-linear loads are called load windings. The number of turns of the load winding and the filter winding is selected as required.
According to whether there is an electrical connection between the two secondary windings, two basic types of induction filter transformers can be constructed.
These are inductive inductive filter transformers and auto-coupling inductive filter transformers, as shown in Figure B.1 (b) and Figure B.1 (c). Inductive filter
There is no electrical connection between the load winding and the filter winding of the transformer. The filter winding generates harmonic currents with the load purely through the principle of electromagnetic induction.
Harmonic currents in opposite directions. The secondary winding of the auto-coupling inductive filter transformer has not only a magnetic connection, but also an electrical connection.
The end has a common connection point with the load, and the other end is connected to the tap position of the secondary winding. The filter winding not only performs harmonic suppression, but also participates in active power.
Transmission can improve the material utilization rate of the transformer.
B.1.3 Realization conditions of inductive filtering
According to the previous analysis of the basic principles of inductive filter transformers and auto-coupling inductive filter transformers, the filter
The wave winding and the induction filter together form a closed loop with zero harmonic impedance at certain specific frequencies. In order to meet the performance of inductive filtering
According to the requirements, the inductive filter technology must meet the following technical conditions for the inductive filter transformer and the inductive filter.
(a) There are only three windings for each phase of the induction filter transformer, namely the primary side power winding, the secondary side load winding and the secondary side induction
Filter winding
(b) The equivalent leakage impedance of the secondary-side induction filter winding adopts a zero impedance design, which is zero or close to zero; at the same time, it makes the induction filter
Use the fully-tuned design method to design, make it work completely at the resonance point, so as to obtain the best filtering effect;
(c) In order to reduce as much as possible the harmonic suppression transformer caused by system frequency, filter parameter deviation and filter winding equivalent impedance change
The harmonic suppression effect ensures that the harmonic current of the primary winding is as small as possible, and the equivalent impedance of the primary winding should be designed to be slightly larger.
B.2 Inductive filtering effect
Figure B.4 shows the measured waveforms of the voltage and current at the input terminal of the induction filter transformer on the grid side. It can be seen by comparison,
After putting in the fully tuned filter device, the grid-side current waveform has been greatly improved, and it is already very close to a sine wave.
(a) No filter is applied
(b) Input filter
Figure B.4 The voltage and current measurement waveforms of the input terminal of the grid-side winding before and after induction filtering
The suppression of the main sub-characteristic harmonic currents by the complete set of induction filtering equipment is shown ...
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