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DL/T 2003-2019: Application guide of on-load tap-changer for HVDC converter transformers
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Application guide of on-load tap-changer for HVDC converter transformers
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Basic data | Standard ID | DL/T 2003-2019 (DL/T2003-2019) | | Description (Translated English) | Application guide of on-load tap-changer for HVDC converter transformers | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K41 | | Classification of International Standard | 29.180 | | Word Count Estimation | 19,134 | | 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 | | Summary | This standard specifies the structure and classification, selection principles, technical requirements, testing, installation, operation and maintenance, packaging, transportation and storage of on-load tap changers of oil-immersed converter transformers (hereinafter referred to as converter transformers). This standard applies to resistive on-load tap changers for converter transformers. | DL/T 2003-2019: Application guide of on-load tap-changer for HVDC 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.
Application Guide of On-Load Tap-Changer for HVDC converter transformers
ICS 29.180
K 41
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
On-load tap changer for converter transformer
Usage guidelines
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Preface...1
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Structure and classification...3
4.1 Structure...3
4.2 Classification...3
5 Selection principle...3
5.1 Basic selection principles...3
5.2 Principles for determining insulation level...3
5.3 Tap Range...4
5.4 Winding arrangement...4
5.5 Type selection...4
5.6 Current rate of change...4
5.7 Harmonics...4
5.8 Potential Resistance and Potential Resistance Switch...4
6 Technical requirements...4
6.1 Overview...4
6.2 Normal operating conditions...4
6.3 Overload...5
6.4 Mechanical life and electrical life...5
6.5 Oil Conservator and Oil Chamber...5
6.6 Insulating oil, oil filtering device and heat sink...5
6.7 Oil temperature requirements in the oil chamber during continuous operation...5
6.8 Protection...6
7 Test...6
7.1 Type test and routine test...6
7.2 Routine test with converter transformer...6
8 Installation...6
8.1 Installation of on-load tap-changer body...6
8.2 Installation of electric operating mechanism...7
8.3 Installation of oil filter device...7
9 Operation, maintenance and overhaul...7
9.1 Operation and maintenance...7
9.2 Maintenance...8
10 Marking, packaging, transportation and storage...11
10.1 Logo...11
10.2 Packaging...11
10.3 Transportation and storage...11
Appendix A (informative appendix) Current rate of change...13
Appendix B (informative appendix) Gas generation characteristics of on-load tap-changer change-over selector for commutation transformer...14
Appendix C (informative appendix) Layout of external embedded on-load tap-changer without partition...16
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. China Southern Power Grid Research Institute Co., Ltd., State Grid Jiangsu Electric Power Co., Ltd., China Southern Power Grid
Limited liability company, China Electric Power Research Institute Co., Ltd., State Grid Hubei Electric Power Co., Ltd. Electric Power Research Institute, Electric Power Industry
Equipment Quality Inspection and Testing Center, State Grid Zhejiang Electric Power Research Institute, Guangxi Power Grid Co., Ltd. Electric Power Research Institute,
China Southern Power Grid EHV Transmission Company, Shanghai Huaming Power Equipment Manufacturing Co., Ltd., Hefei ABB Transformer Co., Ltd., Guizhou Changzheng Electric
Co., Ltd., MR Kaide Trading (Shanghai) Co., Ltd., Baoding Tianwei Baobian Electric Co., Ltd., Xi'an Xidian Transformer Co., Ltd.
Ren company, TBEA Hengyang Transformer Co., Ltd.
The main drafters of this standard. Zhang Xi, Wang Jianming, La Yuan, Zhang Shuzhen, Wang Ruizhen, Zhang Jin, Zhan Jiangyang, Sun Yong, Liang Chen,
Su Xinghua, Li Xianwei, Deng Lijian, Tao Bo, Wu Xuanxia, Shen Dazhong, Hu Wenbin, Li Yunlong, Wang Fenshao, Ning Chaohui, Wang Xiangzhong
This standard is 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 (Baiguang, Xuanwu District, Beijing)
No. 1, Lu Er Tiao, 100761)
Guidelines for the use of on-load tap-changers for converter transformers
1 Scope
This standard specifies the structure, classification and selection principles of on-load tap changers of oil-immersed converter transformers (hereinafter referred to as converter transformers)
Technical requirements, testing, installation, operation and maintenance, packaging, transportation and storage.
This standard applies to resistance type on-load tap changers for converter transformers.
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.
For undated reference documents, the latest version (including all amendments) is applicable to this standard.
GB/T 507 Insulating oil breakdown voltage test method
GB 1094.1 Power Transformer Part 1.General Rules
GB 1094.3 Power Transformer Part 3.Insulation level, insulation test and external insulation air gap
GB 1094.5 Power Transformer Part 5.Ability to withstand short circuit
GB 1094.7 Power Transformer Part 7.Load Guidelines for Oil-immersed Power Transformers
GB 2536 Unused mineral insulating oil for electrical fluid transformers and switches
GB 10230.1 On-load tap changer Part 1.Performance requirements and test methods
GB/T 10230.2 On-load tap changer Part 2.Application guidelines
GB 18494.2-2007 Converter transformer Part 2.Converter transformer for HVDC transmission
GB 20838-2007 Technical parameters and requirements for oil-immersed converter transformers for HVDC transmission
GB 50776-2012 Code for site construction and acceptance of converter transformers in converter stations of ±800kV and below
GB 50150 Electrical equipment installation engineering electrical equipment handover test standard
DL/T **** Guidelines for the selection of on-load tap-changers for power transformers (write clauses in the quoted part)
DL/T 572 Power Transformer Operation Regulations
DL/T 573 Power Transformer Maintenance Guide
DL/T 574 Operation and maintenance guidelines for on-load tap changers of transformers
DL/T 596 Preventive test procedures for electrical equipment
JB/T 7065 Pressure relief valve for transformer
JB/T 8314 Test Guide for On-load Tap Changers
JB/T 9647 gas relay
JB/T 10372 hydraulic pressure relay
3 Terms and definitions
The following terms and definitions established by GB 10230.1 and GB/T 10230.2 apply to this standard. For ease of use, the following
Some terms and definitions in GB 10230.1 and GB/T 10230.2 are listed repeatedly.
3.1
Change-over selector
A device that can be used in conjunction with a tap selector or selector switch and can carry current but cannot make and break the passing current. When from one
When one terminal position is transferred to another terminal position, the contact of the tap selector or selector switch and the tap connected to it can be connected more than once.
Is being used.
Note. Rewrite GB 10230.1-2007, definition 3.6
3.2
Reversing change-over selector
A change-over selector that connects one end or the other end of the tap winding to the main winding. There may be common between it and the tap selector
The number of contacts and the polarity selection position is 2, which are respectively connected to the 2 terminals of the tap winding.
Note. Rewrite GB 10230.1-2007, definition 3.8
3.3
Coarse change-over selector
A change-over selector that connects the tap winding to the coarse winding or to the main winding or its part of the winding.
[GB 10230.1-2007, definition 3.7]
3.4
Switched current
When tapping is changed, the expected breaking current on each main make-break contact group or transition contact group of the diverter switch, or when the change-over selector moves
During operation, due to the capacitive coupling effect of the tap winding on the adjacent windings, the fuel tank and the iron core and the connection potential resistance, the expected opening on the moving and fixed contacts
Broken current.
Note. Rewrite GB 2900.95-2015, definition 2.2.1.
3.5
Recovery voltage
Each main on-off contact group or transition contact group of the diverter switch of the combined on-load tap-changer appears after the breaking current is cut off.
The power frequency voltage of the fracture. Or when the change-over selector acts, due to the capacitive coupling effect of the tap winding on the adjacent windings, the fuel tank and the iron core,
The power frequency voltage generated between the switch selector contact groups after the breaking current is cut off.
Note. Rewrite GB 10230.1-2007, definition 3.22.
3.6
Tie-in resistor
Binding resistance
In order to limit the recovery voltage generated between the contacts when the contacts of the change-over selector are moved, the tap winding is connected to the current output terminal
The resistance connected between.
3.7
Switch for tie-in resistor
Bonded resistance switch
A device used to connect and disconnect potential resistance. One end of the device is connected with the potential resistance, and the other end is connected with the switch current output
The terminal connection shall be closed before the switching selector action, and reopen when the switching selector action is completed, and the insulation distance shall be ensured.
3.8
Current change rate
The rate of change when the load current of the grid-side winding of the converter transformer crosses zero. Its magnitude is related to the trigger angle and the cut-off angle, and is generally recorded as di/dt.
4 types
4.1 Structure
The on-load tap-changer for the converter transformer is generally a combined on-load tap-changer according to the particular application conditions.
4.2 Arc extinguishing method
The on-load tap-changer for converter transformers is classified into vacuum extinguishing type and oil extinguishing type according to the arc extinguishing mode.
5 Selection principle
5.1 Basic selection principles
The selection of the on-load tap changer for the converter transformer should meet the principle of the HVDC transmission system and the actual operation and test conditions of the converter transformer.
Priority is given to the use of existing standard on-load tap-changers, generally combined on-load tap-changers. Its structure, function, technical parameters and
The installation method shall meet the relevant requirements for the safe operation of the converter transformer. Based on the particularity of the converter transformer, the selection of its on-load tap changer needs to be considered
Voltage regulation range, voltage regulation stages, switching load, operating frequency, protection when on-load tap changer is abnormal, harmonic component, current change rate, change
Rheological impedance, long-term overload conditions of commutation transformer, gas production requirements for over-polarity conversion, etc.
5.2 Determination of basic parameters
5.2.1 The type and parameters of the on-load tap changer should be selected according to the system and converter transformer parameters, including but not limited to the following information.
a) Type of converter transformer (double winding or triple winding), single rated capacity;
b) Rated voltage, voltage regulation range, voltage regulation stages, impedance voltage;
c) The winding connection mode of the converter transformer, the connection group of the grid side and valve side winding, the number of phases, the number of parallel winding columns and the capacity of each column;
d) Tap winding wiring diagram, winding arrangement size diagram (or necessary tap winding part to ground and capacitance between other windings, coarse and fine adjustment
Leakage reactance when windings are connected in series);
e) Maximum level voltage, maximum operating current, zero-crossing change of grid-side winding load current under different trigger angles/turn-off angles of a single converter transformer
Rate (di/dt), harmonic spectrum;
f) Switch insulation level;
g) The voltage gradient on the tap winding during the impact test and the AC induction test;
h) The relevant requirements of the power grid system, such as the overcurrent and overexcitation requirements of the converter transformer;
i) Requirements for the on-load tap changer protection system;
j) Requirements for the secondary control system of the on-load tap-changer drive mechanism, including the on-load tap-changer tap position signal and operating status signal.
5.2.2 The manufacturer of the on-load tap-changer shall calculate and determine the appropriate on-load tap-changer based on the information in 5.2.1.
a) The specific model and parameters of the on-load tap changer;
b) Connection diagram and size diagram of on-load tap changer;
c) Potential resistance value, connection diagram and size diagram;
d) Protection device configuration and drawings, and the protection value is determined;
e) Electric mechanism configuration, size diagram and circuit schematic diagram.
The converter transformer manufacturer shall verify the type and technical parameters of the determined on-load tap changer.
5.3 Tap range
The tapping range and the number of voltage regulation stages of the on-load tap changer used in the commutation transformer should fully consider the various operating conditions of the DC transmission system and the operation of the converter.
According to the requirements, the system should be designed with the on-load tap-changer supplier to confirm whether the product meets the requirements.
5.4 Winding arrangement
The conventional layout of main winding and tap winding of converter transformer mainly includes "iron core-valve-net-adjustment-tank" and "iron-core-adjustment-net-valve-tank"
Two ways. When selecting the on-load tap-changer, pay attention to the winding arrangement, which is caused by the recovery voltage of the on-load tap-changer when the change-over selector acts.
influences.
5.5 Current rate of change
The on-load tap-changer supplier shall calculate the recovery caused by the current change rate according to the current change rate under different firing angles provided by the system
The influence of voltage, circulating current, switching capacity, etc. on the on-load tap-changer, and provide on-load tap-changers that meet the requirements. About current changes
Refer to Appendix A for the influence of speed on the performance of the on-load tap changer of the converter transformer.
5.6 Extinguishing method
The current rate of change when the load current crosses zero has a greater impact on the breaking performance of the switch contacts. When the commutation transformer is running, its load current is over
The zero current rate of change is much greater than the zero-crossing rate of change of a standard AC sine wave. Under the same passing current and voltage level, when the current change rate
When it is higher, the switching capacity of the arc extinguishing switch in oil is lower than that of the vacuum extinguishing switch. Should be selected according to the converter capacity and current change rate
The arc extinguishing mode of the on-load tap changer. For example, in the application of single-phase dual-column converter transformers with lower capacity, a single dual-pole vacuum arc extinguishing
To connect the switch, you can also choose two single-pole arc extinguishing on-load tap-changers; similarly, for single-phase three-column converter transformer applications, you can choose
A single three-pole vacuum arc extinguishing on-load tap-changer can also be used with three single-pole oil extinguishing on-load tap-changers. The principle of choosing the arc extinguishing method
It depends on the ability of the switch to break with a higher rate of current change.
5.7 Harmonics
The supplier of the on-load tap-changer should consider the selection of the on-load tap-changer's current-carrying and arc extinguishing capabilities under harmonic conditions based on the harmonic current spectrum.
5.8 Potential resistance (binding resistance) and potential resistance switch
The recovery voltage generated by the on-load tap changer selector for the commutation transformer is relatively large, and the tap winding (generally
Is the middle part) connected to a fixed potential (such as the neutral point) to limit the tap winding potential, thereby limiting the recovery electricity generated when the change-over selector moves
Pressure.
The converter transformer has a large voltage regulation range and high level voltage. When the potential resistance is fixedly connected, a large loss will be generated under the action of the tap winding voltage.
In order to reduce the loss, the potential resistance should be connected to the potential resistance switch.
The potential resistance should have sufficient heat capacity. The resistance value is based on the converter variable structure parameters and the on-load tap changer switch selector recovery voltage withstand
The value is calculated and determined.
6 Technical requirements
6.1 Overview
The on-load tap changer shall meet the requirements of this chapter in addition to the requirements of GB 10230.1 and GB/T 10230.2.
6.2 Operating conditions
The operating conditions are consistent with the converter transformer.
If the operating conditions of the on-load tap-changer do not meet the operating conditions of the converter transformer, you should consult the on-load tap-changer manufacturer when ordering.
Provide special instructions so that the on-load tap-changer manufacturer can provide corresponding measures or products.
6.3 Overload
The on-load tap-changer shall meet the overload requirements of the converter transformer, and its maximum rated through current shall be considered based on 1.1 times the overload of the converter transformer.
6.4 Mechanical life and electrical life
The arc-extinguishing on-load tap-changer in oil shall not need to be lifted for inspection and repair within 6 years of operation and 100,000 operations. Electricity of switch contacts
The service life should not be less than 300,000 times, and the mechanical life should not be less than 800,000 times.
The vacuum arc extinguishing on-load tap-changer should not need to be lifted and repaired within 15 years of operation and 300,000 operations, and the electrical life should not be less than
600,000 times, the mechanical life is not less than 1.2 million times.
6.5 Oil conservator and oil compartment
An independent oil conservator should be installed on the on-load tap-changer. The volume of the oil conservator should meet the operating temperature changes of the on-load tap-changer and regular oil sampling.
At the same time, factors such as the number of parallel units, oil filter and heat sink should also be considered.
The oil chamber of the on-load tap-changer shall be able to meet the requirements of vacuuming simultaneously with the converter oil tank.
6.6 Oil temperature requirements in the oil chamber during continuous operation
During the operation of the on-load tap-changer, the oil temperature in the independent oil chamber of the on-load tap-changer should not exceed 125°C.
If the converter transformer requires continuous operation of the on-load tap changer, it should be mentioned when ordering. Performed by the on-load tap-changer manufacturer according to requirements
Check the temperature rise.
6.7 Insulating oil, oil filtering device and heat sink
6.7.1 Insulating oil
The oil in the oil chamber and its oil conservator should use the same oil as the converter transformer body.
6.7.2 Oil filter device
The on-load tap-changer with arc extinguishing in oil should be equipped with an online oil filter device, and its installation position should consider maintenance, replacement of the filter element and observation of the filter element condition
The convenience. The on-load tap-changer manufacturer should provide a start-stop strategy plan, and the start-stop of the oil filter device should not cause protection malfunction.
The on-load tap-changer on-line oil filter device should have the function of filtering impurities and moisture (composite filter element or single filter element), and easy to replace the filter element.
When multiple oil-extinguishing on-load tap-changers are used in one converter transformer, each on-load tap-changer should be equipped with an independent online oil filter device.
Set.
The on-load tap-changer of vacuum extinguishing type can not be equipped with online oil filter device.
The independent oil chamber of the vacuum extinguishing on-load tap-changer can be installed with a dissolved gas analysis device in the oil.
6.7.3 Heat sink
According to the requirement of continuous switching times, when the temperature of the oil chamber of the on-load tap-changer exceeds the allowable value, a heat sink should be installed. It and switch on
The oil shutoff chamber is connected, and generally consists of oil pump, radiator, connecting pipeline and other parts. The heat sink should effectively control the temperature of the oil chamber,
The switch manufacturer should provide start-stop and operation strategies, which should not cause protection to malfunction.
The manufacturer of the on-load tap-changer shall determine the type, specification and control method of the heat dissipation device.
When installing a heat sink, an oil temperature measuring device should be installed at the same time.
6.8 Protection
6.8.1 The independent oil chamber of the on-load tap-changer should adopt an oil flow relay or a pressure relay for converter transformer protection, and no gas with a float should be used.
Body relay. If the on-load tap changer of the converter transformer is only equipped with one of the oil flow relay or the pressure relay, it should be tripped; configure at the same time
If the oil flow and pressure relays are activated, the oil flow relay should be tripped, and the pressure relay should be set to alarm. Three sets of independent contacts shall be provided for tripping.
6.8.2 The supplier of the on-load tap-changer shall set appropriate action setting values for its protective relays according to the requirements of the engineering design. Loaded points
The factory flow rate setting test of the oil flow relay connected to the switch shall be carried out with the hot oil flow simulating actual working conditions.
6.8.3 When the on-load tap-changer is running in parallel, in order to avoid the on-load tap-changer used in parallel, it may be caused by the gears not being synchronized.
For circulating current, the synchronous operation of the on-load tap-changer should be monitored and control and protection measures should be taken. The on-load tap-changer supplier shall provide
Load the tap switch gear signal to the background. When the on-load tap changer positions are not synchronized, the next tap change should be blocked and a signal should be sent to ensure that the
Synchronous switching of the on-load tap changer.
6.8.4 In order to prevent the continuous switching operation of the on-load tap-changer from causing excessive oil temperature in the switch oil chamber, the on-load tap-changer can be equipped with an oil temperature measuring device
Or temperature switch, the supplier should give the oil temperature protection setting value, and the device should have a lock or alarm function.
6.8.5 Other requirements for on-load tap changer protection are implemented with reference to DL ****.
7 Test
7.1 Type test and routine test
The type, routine test items and requirements of the on-load tap changer shall be in accordance with the relevant regulations of GB 10230.1, JB/T 8314, DL/T 596
carried out. The type, routine test items and requirements of the electric operating mechanism and controller are in accordance with the relevant regulations of GB 10230.1 and JB/T 8314
carried out.
7.2 Routine test with converter transformer
After the converter transformer is assembled, the on-load tap-changer should withstand the following operation test.
a) The converter transformer is not excited, and no less than 8 operating cycles are completed at 100% of the rated operating voltage;
b) The converter transformer is not excited, and one operation cycle is completed at 85% of the rated operating voltage;
c) When the commutation transformer is excited at no load, one operation cycle is completed; the two switches on each side are tapped at the operating position of the changeover selector or in the middle.
Complete 20 tap change operations within a tap range;
d) After the temperature rise test is over, apply the rated current and operate the on-load tap-changer to complete 10 operation cycles. After the test is completed, measure the winding
Group DC resistance.
Before, after and 24 hours after the end of the test, the independent oil chamber (only for the vacuum extinguishing switch) and the main oil tank of th...
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