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DL/T 2002-2019 English PDF

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DL/T 2002-2019: Operation specification for converter transformer
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Basic data

Standard ID DL/T 2002-2019 (DL/T2002-2019)
Description (Translated English) Operation specification for converter transformer
Sector / Industry Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard K41
Classification of International Standard 29.180
Word Count Estimation 14,190
Date of Issue 2019-06-04
Date of Implementation 2019-10-01
Quoted Standard GB/T 1094.5-2008; GB/T 1094.7; GB/T 2900.33-2004; GB/T 2900.95-2015; GB/T 6451-2015; GB/T 18494.2-2007; GB/T 20838-2007; GB 50148; DL/T 393; DL/T 572-2010; DL/T 573; DL/T 574; DL/T 722-2014
Issuing agency(ies) National Energy Administration
Summary This standard specifies the basic requirements, operating conditions, operation and maintenance, abnormal operation and treatment, maintenance requirements of standby converter transformers, and maintenance and testing of converter transformers (referred to as converter transformers). This standard applies to converter transformers with voltage levels of ��800kV and below for DC transmission.

DL/T 2002-2019: Operation specification for converter transformer

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Operation specification for converter transformer ICS 29.180 K 41 Record number. 63143-2018 People's Republic of China Electric Power Industry Standard Operating Regulations of Converter Transformer 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration

Table of contents

Foreword...I 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 Basic requirements...2 4.1 Protective device...2 4.2 Measuring device...3 4.3 Cooling device...3 4.4 Technical documents...4 4.5 Other requirements related to operation...4 5 Operating conditions...5 5.1 General operating conditions...5 5.2 Operation mode under different load conditions...5 5.3 Operating conditions of converter transformers connected to the same valve group...7 5.4 Economic operation...7 6 Operation and maintenance...7 6.1 General Items...7 6.2 Commissioning and shutdown...8 6.3 Operation and maintenance of non-electricity protection devices...8 6.4 Operation and maintenance of on-load tap-changer...10 6.5 Operation and maintenance of casing...10 6.6 Operation and maintenance of the cooler...11 6.7 Prevent short circuit damage...11 7 Abnormal operation and handling...11 7.1 Abnormal phenomena and treatment during operation...11 7.2 Handling of gas relay action...12 7.3 Operation mode and handling requirements when the cooling device fails...13 7.4 Tripping and extinguishing of converter transformer...13 8 Maintenance requirements for standby transformers...13 9 Inspection and test...13

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. Guangzhou Bureau of China Southern Power Grid Co., Ltd. EHV Transmission Company, State Grid Corporation of China, China Southern Power Grid Co., Ltd., China Electric Power Research Institute Co., Ltd., State Grid Zhejiang Electric Power Research Institute, Jiangsu Electric Power Company Repair branch, electric power industry electrical equipment quality inspection and testing center, State Grid Hubei Electric Power Co., Ltd., State Grid Electric Power Research Institute Wuhan South Rui Co., Ltd., Xi'an Xidian Transformer Co., Ltd., ABB Chongqing Transformer Co., Ltd., Changzhou Toshiba Transformer Co., Ltd., TBEA Xinjiang Transformer Factory, TBEA Hengyang Transformer Co., Ltd., Jiangsu Huapeng Transformer Co., Ltd., MR Kaide Trading (Shanghai) Co., Ltd. The main drafters of this standard. Yang Jinglin, Shi Yanhui, Lu Licheng, La Yuan, Li Hui, Zhang Shuzhen, Sun Xiang, Xu Jiangang, Ying Si, E Shiping, Yang Shichao, Yang Zhongli, Liu Huaihe, Hong Ruijun, Liu Mingkuang, Xie Wenying, Yu Zhigang, Hu Wenbin. The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (Baiguang Road, Xuanwu District, Beijing) Two Article No. 1, 100761). Operating Regulations of Converter Transformer

1 Scope

This standard specifies the terms and definitions of converter transformers (hereinafter referred to as converter transformers), basic requirements for operation, operating conditions, operation and maintenance, and Requirements for normal operation and treatment, as well as maintenance and testing. This standard applies to converter transformers with voltage levels of ±800kV and below for DC transmission.

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 1094.5-2008 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 6451-2015 Oil-immersed power transformer technical parameters and requirements GB/T 18494.2-2007 Converter Transformer Part 2 Converter Transformer for HVDC Transmission GB/T 20838-2007 Technical parameters and requirements of oil-immersed converter transformers for HVDC transmission GB 50148 Code for construction and acceptance of power transformers, oil-immersed reactors, and transformers for electrical installation engineering DL/T 393 Power transmission and transformation equipment condition inspection and repair test procedure DL/T 572-2010 Power Transformer Operation Regulations DL/T 573 Power Transformer Maintenance Guide DL/T 574 Operation and maintenance guidelines for transformer tap changers DL/T 722-2014 Guidelines for the analysis and judgment of dissolved gases in transformer oil

3 Terms and definitions

The following terms and definitions given in GB/T 2900.95-2015 and GB/T 2900.33-2004 apply to this standard. 3.1 Converter transformer Used to connect the AC grid and 6/12 pulse converter valve for energy exchange equipment. 3.2 Gas relay A protection device used in the body of an oil-immersed transformer. It will act when a large amount of gas or oil flow is impulsive due to a fault in the transformer. Pass the designated control loop and send out alarm and trip signals. [GB/T 2900.95-2015 definition 5.1.3] 3.3 On-load tap-changer A device suitable for changing the winding tap connection position under transformer excitation or load. [GB/T 2900.95-2015 definition 5.6.1] 3.4 Pressure relief device A protection device that releases the excessive pressure generated when the internal failure of the fuel tank occurs. When the pressure exceeds the predetermined setting value, the release device opens and Discharge a large amount of gas and oil out of the fuel tank in time to reduce the internal pressure of the fuel tank. [GB/T 2900.95-2015 definition 5.1.10] 3.5 Quick action oil-pressure relay When the converter transformer fails during operation, the pressure rise speed in the fuel tank reaches the set value, and the relay acts to make the control circuit send out a signal or make A protection device for the converter transformer to exit operation. Note. Rewrite GB/T 2900.95-2015 definition 5.1.20.

4 Basic requirements

4.1 Protection device 4.1.1 The converter transformer shall be equipped with protection devices in accordance with relevant standards such as GB 20838 and manufacturer's regulations. 4.1.2 The safety protection device and oil protection device of the converter transformer shall meet the requirements of the corresponding standards. 4.1.3 When installing the gas relay of the converter transformer, the oil pipe should have a rising slope of 1% to 1.5% along the oil flow direction of the gas relay (the manufacturer has regulations According to the manufacturer's regulations). The gas relay of the transformer should be equipped with a rain cover of corrosion-resistant and anti-aging material. The secondary cable should be installed before entering the gas relay. Set drip bends to prevent the contact from moving by damp. 4.1.4 The commutation transformer should be equipped with a shock-proof gas relay. 4.1.5 The gas relay should not adopt a cantilever beam installation structure. 4.1.6 When two or more on-load tap-changers are used in parallel in the converter transformer and one on-load tap-changer conservator is shared, each on-load tap-changer Oil flow relay or pressure relay should be installed respectively as the main protection trip. The oil flow relay of the on-load tap changer should be connected to The connected branch oil pipe has a 1% to 3% rising slope along the oil flow direction of the oil flow relay (the manufacturer has regulations according to the manufacturer's regulations). 4.1.7 The protection trip function of the converter transformer should adopt three out of two logic. 4.1.8 When the actual short-circuit apparent capacity of the system where the converter transformer is located is greater than the value specified in Table 2 of GB 1094.5-2008, the system shall be The manufacturer makes a request. Measures should be taken to limit the short-circuit current of the converter transformer during operation. The protection action time of the converter transformer should be less than withstand short circuit heat resistance The duration of the ability. 4.1.9 The installation of the pressure release device should ensure that the accidental fuel injection is unblocked, avoid spraying into the cable trench, bus bar and other equipment, and should be covered if necessary. The accident drain valve should be installed in the lower part of the converter transformer with the drain port facing downward. 4.2 Measuring device 4.2.1 The converter transformer shall be equipped with measuring devices in accordance with relevant standards and manufacturer's regulations. 4.2.2 The converter transformer temperature measuring device shall meet the following requirements. a) There is a thermometer to measure the top oil temperature; b) There is a thermometer to measure the winding temperature; c) Connect the signal thermometer to the remote signal; d) When measuring temperature, the thermometer socket should be filled with insulating oil; e) The thermometer can indicate the highest temperature during operation. 4.2.3 If the converter transformer adopts inflatable casing, the gas pressure signal should be transmitted to the background, and density relay should be installed, and the installation position is convenient for observation. 4.2.4 The online monitoring device installed on the converter transformer should be reliably grounded. The device for collecting the dissolved gas in the oil should be able to avoid polluting the tank body. It has good sealing performance and the signal should be transmitted to the background. 4.3 Cooling device 4.3.1 The cooling device of the converter transformer shall meet the following requirements. a) The cooling system with strong oil circulation should have two independent working power sources and be able to switch automatically and manually. When the working power fails, Alarm signals such as graphics and audio should be sent out in the background; b) Strong oil circulation converter, when the faulty cooler is cut off, it should send out graphic, sound and other alarm signals in the background, and automatically put it into standby Cooler. For commutation transformers with two or more groups of cooling systems, they should be automatically grouped to delay start and stop; c) The cooler should be fixed on the converter oil tank via a valve or an independent floor support, so that the converter oil tank will not be installed or disassembled. Must drain oil; d) The auxiliary motor of the fan and the oil pump should be protected against overload, short circuit and open phase. There should be a device to monitor the direction of oil flow; e) It should be able to control the switching on and off of the cooler according to temperature and (or) load current, and the automatic device for switching on and off the cooler should remain normal; f) The converter transformer cooler should have a strong switching function, and the cooler should be manually put into operation when the cooler control circuit fails; g) The submersible pump should adopt E-class or D-class bearings, and a lower speed oil pump (less than 1500rpm) should be used; h) The operating status signal of the converter transformer cooler should be connected to the background control system for monitoring and viewing; i) After the internal fault of the converter transformer is tripped, the oil pump should be cut off immediately to prevent foreign matter such as free carbon and metal particles from entering the transformer. The non-faulty part of the device. 4.4 Technical documents 4.4.1 After the installation of the new equipment is completed, the following documents shall be handed over to the operating unit. a) Technical contracts (or technical conditions) for conversion and variable ordering, technical documents for design changes, etc.; b) Installation instructions, certificates, drawings and factory test reports provided by the manufacturer; c) The body, cooling device and various accessories (bushing, transformer, on-load tap changer, gas relay, pressure release valve and instrument, etc.) Handover test report and maintenance manual; d) Installation reports such as inspection and treatment records of the device body, and overall sealing test report; e) Record the whole installation process (according to GB 50148 and relevant regulations of the manufacturer); f) The installation as-built drawing of the converter transformer cooling system, the control and protection circuit of the on-load voltage regulator; g) Oil quality test and chromatographic analysis records; h) List of spare parts and special tools; i) Manufacturing supervision report; j) If the casing is filled with insulating gas, there should be an insulating gas test report. 4.4.2 After the overhaul is completed, the following documents shall be handed over to the operating unit. a) The reason for the maintenance of the converter transformer and auxiliary equipment, and the whole process record of the inspection of the body, the overall sealing test, and the drying record; b) Test records before and after the overhaul of the converter transformer and auxiliary equipment. 4.4.3 Each converter transformer should have the following technical files. a) Conversion history card; b) All documents handed over after the installation is completed; c) Documents handed over after maintenance; d) Preventive test records; e) Verification records of converter transformer protection and measuring devices; f) Oil treatment and oil filling records; g) Other test records and inspection records; h) Records of commutation transformer accidents and abnormal operations (such as over-temperature, gas relay action, short circuit in the vicinity, etc.). 4.4.4 When the converter transformer is handed over, the technical files of the converter transformer shall be transferred together. 4.5 Other requirements related to operation 4.5.1 The converter transformer shall have a nameplate, and the nameplate shall be hung reliably and firmly. 4.5.2 The commutation transformer shall have the operation number and phase mark. 4.5.3 When the converter transformer is in operation, it should be possible to safely check the oil level of the oil conservator and casing, the top oil temperature, the temperature of the valve side winding or the grid side winding, The on-load tap-changer gear position and operating status should be able to take gas samples safely, and a fixed ladder should be installed when necessary. 4.5.4 The converter transformer installed in the open air should have good ventilation facilities to avoid excessively high temperature of the converter transformer. Equipped with external mechanical ventilation When the mechanical ventilation stops, it should be able to send a remote signal. Generally, the ventilation system of the converter transformer should not be connected with other ventilation systems. change The door of the rheological interval should be made of flame-retardant or non-combustible materials, and the direction of opening the door should be outward. The name and operation number of the rheology should be marked on the door. Hang a sign of "Stop, High Voltage Danger" and lock it. 4.5.5 The site of the converter transformer should be equipped with fire-fighting facilities and accident oil storage facilities, and kept in good condition. 4.5.6 For converter transformers installed in areas with an earthquake intensity of 7 degrees and above, the following earthquake-proof measures shall be adopted. a) When the converter transformer sleeve is connected to the flexible wire, it should be properly loosened; when it is connected to the hard wire, the transition soft connection should be appropriately lengthened; b) When the cooler and the converter transformer are arranged separately, the converter transformer should be connected to the cooler through valves, flexible joints, and connecting pipes. 4.5.7 The grounding point of the converter transformer core and clamps should be led to the bottom of the converter transformer to facilitate current measurement. 4.5.8 Install “No Climbing” and other safety signs at the converter ladder. 4.5.9 Equipped with an on-load tap changer with an online oil filter unit. When the oil filter unit fails, it should send out graphic and audio alarm signals. 4.5.10 The oil level gauge of the oil-paper-insulated casing should face the outside of the converter transformer compartment for easy inspection. 4.5.11 The density relay or pressure gauge of the inflatable casing should have good shockproof measures. 4.5.12 When the casing riser extends into the valve hall, measures should be taken to prevent transformer oil from polluting the valve hall. 4.5.13 Active voltage divider should not be used for the valve side bushing.

5 Operating conditions

5.1 General operating conditions 5.1.1 The normal operating voltage of the converter transformer shall not exceed the maximum operating voltage of the system. 5.1.2 The capacity of each tap position of the on-load voltage regulating converter transformer should meet the manufacturer's regulations. 5.1.3 In general, the temperature rise of the converter transformer should not exceed the regulations in Table 1 (if specified by the manufacturer, follow the regulations of the manufacturer). 5.1.4 The load capacity of the converter transformer with improved structure or changed cooling method shall be determined through temperature rise test. 5.2 Operation mode under different load conditions 5.2.1 Basic requirements for converter transformer operation under different load conditions 5.2.1.1 The load status can be divided into the following three categories. a) Normal periodic load. In periodic load, the ambient temperature is high for a certain period of time or exceeds the rated current, but other The ambient temperature during the time is lower or lower than the compensation of the rated current. From the point of view of thermal aging, it is different from the environmental temperature used in the design. It is equivalent to add rated load. b) Long-term emergency cyclical load. the converter transformer is required to operate at a high ambient temperature or exceed the rated current for a long time. This run The method may last for several weeks or months, which will accelerate the aging of the converter transformer, but will not directly endanger the safety of the insulation. c) Short-term emergency load. the converter transformer is required to run in a short time and greatly exceed the rated current. This load may cause the winding hot spot temperature to reach To a dangerous degree, the insulation strength temporarily decreases. 5.2.1.2 Restrictions on group components and circuit components The current-carrying accessories and external loop components of the converter transformer should be able to meet the requirements of over-rated current operation. When any of the accessories and loop components cannot meet When required, the load should be limited according to the accessories and components with the smallest load capacity. When the structural parts of the converter transformer cannot meet the requirements of over-rated current operation, Whether to limit the load and the extent of the restriction should be determined according to the specific situation. 5.2.2 Normal periodic load operation 5.2.2.1 The converter transformer can operate at the rated current throughout the year under the rated use conditions. 5.2.2.2 The commutation transformer is allowed to periodically exceed the rated current when the average relative aging rate is less than or equal to 1. 5.2.2.3 When the converter transformer has serious defects (such as abnormal cooling system, serious oil leakage, local overheating, analysis of dissolved gas in oil If the result is abnormal, etc.) or the insulation is weak, it is not suitable to operate with overload. 5.2.3 Long-term emergency operation of periodic loads 5.2.3.1 When operating under long-term emergency cyclical load, the life of the converter transformer will be shortened to varying degrees, and such operation should be minimized. Possibility of the method; when it must be adopted, the operating time of the over-rated current should be shortened as much as possible, and the multiple of the over-rated current should be reduced. The manufacturer stipulates that a spare cooler is used. 5.2.3.2 When the converter transformer has serious defects (such as abnormal cooling system, serious oil leakage, local overheating, analysis of dissolved gas in oil When the result is abnormal, etc.) or the insulation has weak points, it is not suitable to operate at an exceeding rated current. 5.2.3.3 During operation under long-term emergency cyclical load, there should be load current records. 5.2.4 Operation of short-term emergency load 5.2.4.1 When running under short-term emergency load, the relative aging rate is far greater than 1, and the winding hot spot temperature may reach a dangerous degree. In this situation Should be put in all coolers including spares (except as otherwise specified by the manufacturer), and try to compress the load and reduce the time, generally not More than 2h. When the converter transformer has serious defects or insulation weakness, it is not suitable for overload operation. 5.2.4.2 During short-term emergency load operation, there should be a detailed load current record. 5.2.5 Requirements for running time of converter transformer exceeding rated load When the converter transformer exceeds the rated load, the operating time refers to the overload curve of the manufacturer, and generally should not exceed the regulations in Table 2 (the manufacturer has regulations According to the manufacturer's regulations). 5.3 Operating conditions of converter transformers connected to the same valve group 5.3.1 Operating conditions of converter transformers connected to the same valve group. a) The connection group labels are the same; b) The voltage ratio should be the same, and the difference should not exceed ±0.5%; c) The deviation of impedance voltage value should be less than 3%; d) The tap voltage difference of the on-load tap changer is the same; e) The deviation of stray capacitance should meet the manufacturer's regulations. 5.3.2 For converter transformers with unequal impedance voltages or unequal voltage ratios, any converter transformer meets GB/T 1094.7 and the manufacturer’s regulations. The circulation of each converter transformer should meet the requirements of the manufacturer. 5.4 Economic operation 5.4.1 The commissioning of the converter transformer should be arranged in a reasonable manner according to the load conditions, starting from the principles of safety and economy. 5.4.2 The metering instrument of converter transformer should be equipped to improve the means of measuring economic operation. 5.4.3 The daily operation data of the converter transformer and the monthly maximum and minimum daily loads shall be recorded for analysis of the economic operation of the converter transformer. 5.4.4 The economic evaluation of converter transformer operation should be carried out regularly, and measures should be taken to optimize converter transformers whose operation is evaluated as uneconomical.

6 Operation and maintenance

6.1 Conventional items 6.1.1 Daily inspection 6.1.1.1 The personnel on duty in the converter station should always monitor the instructions of the instrument and grasp the operation status of the converter in time. Meter reading times of monitoring instruments The number is regulated by the on-site regulations, and the on-site instruments and remote instruments are checked regularly. 6.1.1.2 The cycle and content of the routine inspection and inspection of the converter transformer shall refer to the requirements of 5.1.2 and 5.1.4 in DL T 572-2010.special The patrol inspection should refer to the provisions of 5.1.3 in DL T 572-2010. 6.1.2 Periodic inspection 6.1.2.1 The converter transformer should be inspected regularly with reference to the items in 5.1.5 of DL T 572-2010.In addition, the following inspection contents (inspection The cycle is stipulated by the site regulations). a) The oil filter unit of the on-load tap changer has no abnormal sound, and the pressure is w...

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