CN202582602U - Transformer running state comprehensive monitoring system - Google Patents
Transformer running state comprehensive monitoring system Download PDFInfo
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- CN202582602U CN202582602U CN 201220184546 CN201220184546U CN202582602U CN 202582602 U CN202582602 U CN 202582602U CN 201220184546 CN201220184546 CN 201220184546 CN 201220184546 U CN201220184546 U CN 201220184546U CN 202582602 U CN202582602 U CN 202582602U
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Abstract
The utility model provides a transformer running state comprehensive monitoring system. The system comprises a transformer monitoring main intelligent electronic device (IED) and a plurality of sub-intelligent electronic devices. The plurality of sub-intelligent electronic devices are a winding temperature measurement sub-IED, a micro water in oil monitoring sub-IED, a transformer partial discharge monitoring sub-IED, an iron core grounding current monitoring sub-IED, a vibration monitoring sub-IED, a transformer insulating bush monitoring sub-IED and a on-load voltage regulation switch monitoring sub-IED respectively. The transformer monitoring main IED is connected to a transformer substation process level network and a transformer substation station level network, and the sub-IEDs are connected to the transformer substation process level network. The transformer running state comprehensive monitoring system of the utility model has the following advantages: monitoring characteristic quantities related to the running state of a transformer are measured on a real time basis by installing various sensors in the transformer, and the running state of the transformer is monitored and evaluated on a comprehensive basis by using the monitoring quantities to satisfy requirements of real-time comprehensive evaluation and early warning on transformer states on site and at the transformer substation level.
Description
Technical field
The utility model relates to a kind of electronic supervisory system, specifically is that a kind of transformer running status is carried out comprehensive on-line monitoring system.
Background technology
Power transformer is as the hinge equipment of electric system, and its property safe and reliable to operation is directly connected to the safety and stablization of electric system.For a long time; Judgement to the transformer operation conditions mostly is through power failure preventive trial and prophylactic repair both at home and abroad; For assessing, but in reality, only can not guarantee the operation that transformer is safe and reliable according to relevant criterion and operating experience through static evaluation.Therefore, judge transformer state through advanced person's state on_line monitoring means, the repair based on condition of component of implementing power transformer is an inexorable trend.
Present existing transformer online monitoring system mostly monitors single parameters such as transformer oil dissolved gas, transformer part are put, ground current; And be independent of electric substation automation system; Different on-line monitoring systems often function singleness and communication standard differ; Therefore be difficult to carry out the system integration and information sharing; It is slower to make the information fusion of many reference amounts share with technical development such as comprehensive assessment diagnosis, the accuracy and the reliability of impact evaluation diagnosis, the requirement of incompatibility intelligent grid and intelligent substation.In addition; Also having some data such as to patrol and examine to analysis-by-synthesis of transformer and method application preventive trial, the routine of assessment monitors and analyzes; This evaluation process need be carried out alternately with production management system; Related data complete obtains also relatively difficulty, and transformer state is monitored on the spot with intellectual analysis and possibly is difficult to obtain in real time these data, and influence is judged and the accuracy of early warning.
Summary of the invention
The purpose of the utility model is to overcome the deficiency that exists in the prior art; A kind of transformer running status comprehensive monitor system is provided, can vibrates isallobaric device operation information to micro-water content, partial discharge quantity, sleeve pipe Jie damage, iron core grounding current, winding temperature, loaded switch, transformer in the oil and carry out comprehensive monitoring and analysis.
The technical scheme that provides according to the utility model; Said transformer running status comprehensive monitor system; Comprise that transformer monitoring master intelligent electronic device and a plurality of sub-intelligent electronic device are respectively: the sub-intelligent electronic device of little water monitoring, partial discharge of transformer are monitored sub-intelligent electronic device, iron core grounding current and are monitored that sub-intelligent electronic device, the sub-intelligent electronic device of vibration monitoring, bushing for transformer are monitored sub-intelligent electronic device, on-load voltage regulating switch is monitored sub-intelligent electronic device in the sub-intelligent electronic device of winding temperature measurement, the oil; Wherein transformer monitoring master intelligent electronic device inserts transformer station's process layer network and transformer station's station level network; Be connected to the station level server through transformer station's station level network, said a plurality of sub-intelligent electronic devices insert transformer station's process layer network.
Further; Said sub-intelligent electronic device comprises: sensor, signal pre-processing circuit, microprocessor, supply module, data acquisition and storage system, IEC61850 communication system; Said sensor connects the A/D port of microprocessor through signal pre-processing circuit; Microprocessor is connected with storage system with supply module, data acquisition, and microprocessor also connects transformer monitoring master intelligent electronic device through said IEC61850 communication system.
Said partial discharge of transformer is monitored sub-intelligent electronic device and is comprised the uhf sensor that is installed on the transformer operation hand hole.
Said iron core grounding current is monitored sub-intelligent electronic device and is comprised the punching high sensitivity power current sensor that is installed on the transformer core ground wire.
The sub-intelligent electronic device of said vibration monitoring comprises 3-6 the vibration transducer that is installed on the transformer body.
Said bushing for transformer is monitored sub-intelligent electronic device and is comprised 3-6 group bottom shielding of bushing current sensor and voltage transformer (VT).
Said on-load voltage regulating switch is monitored sub-intelligent electronic device and is comprised the electric motor starting of detection on-load voltage regulation mechanism and the current sensor of drive current.
The sub-intelligent electronic device of said winding temperature measurement comprises 3-6 the fluorescent optical fiber sensor that is embedded in the Transformer Winding.
The sub-intelligent electronic device of little water monitoring comprises little water sensor in the oil that is installed on the fuel outlet valve place in the said oil.
The utility model has the advantages that: the utility model is utilized in transformer the various kinds of sensors measurement monitoring feature amount relevant with the transformer running status in real time is installed; Utilize the running status of these measuring amount comprehensive monitorings and assessment transformer, carry out the real time comprehensive assessment of on-the-spot and transformer station's aspect and the requirement of early warning to satisfy transformer state.
Description of drawings
Fig. 1 is the schematic flow sheet of power transformer state comprehensive monitoring.
Fig. 2 is the structured flowchart of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
To make assessment more comprehensively and accurately to the power transformer running status and judge, must obtain to reflect the characteristic quantity of transformer state.The transformer state comprehensive monitor system of the utility model development mainly is based on transformer online monitoring intelligent electronic device (IED) and collects various status information amounts, each status information amount is analyzed the comprehensive detection and the assessment of the state of realizing transformer.
The system architecture of transformer running status comprehensive monitor system is as shown in Figure 2.System is monitored by the sub-IED of little water monitoring, partial discharge of transformer in the sub-IED of winding temperature measurement, the oil that sub-IED, the sub-IED of iron core grounding current, the sub-IED of vibration monitoring, bushing for transformer monitor sub-IED, on-load voltage regulating switch is monitored sub-IED such as sub-IED and transformer monitoring master IED etc. and partly constituted.Wherein main IED inserts transformer station's process layer network and transformer station's station level network, each sub-IED access procedure layer network.Realize information sharing based on the IEC61850 standard between each IED and between IED and the other system and communicate by letter.
Each is monitored sub-IED and mainly is made up of sensor, signal pre-processing circuit, microprocessor, supply module, data acquisition and storage system, IEC61850 communication system, IEC61850 network data transmission system.The transformer parameter that sub-IED self monitors through the monitoring of sensor in real time separately; Pass through processing such as signal processing circuit is amplified, filtering, isolation then; Pass through voltage follower again after microprocessor A/D or special-purpose A/D sampling processing synchronously; Under the control of microprocessor, signal sends to the IEC61850 communication system through A/D conversion, buffer memory after then data being packed according to specific form; By the IEC61850 communication system data are sent to main IED through the IEC61850 agreement again, main IED passes the station level server back through IEC61850 after receiving sub-IED data.
The information that on-line monitoring IED gathers comprises: micro-water content in the oil; Partial discharge quantity; State parameters such as sleeve pipe Jie damage, iron core grounding current, winding temperature, loaded switch, transformer vibration utilize these state parameters that transformer state is carried out comprehensive monitoring, and the monitoring flow process is as shown in Figure 1.Transformer comprehensive monitoring and the fault diagnosis system background monitoring management platform as the intelligent transformer assembly is installed on the station level server; Obtain or the real-time Monitoring Data of demonstration transformer from each IED through the IEC61850 standard, and provide the warning indication of monitoring parameter state at real-time Monitoring Data display interface.Combine prior standard standard guide rule, defective fingerprint base, expert system, historical Monitoring Data, real-time Monitoring Data etc. that transformer work at present state is made assessment and fault diagnosis then; Provide state estimation and fault diagnosis result, show monitoring and assessment result in real time and deposit in the database.The utility model also is provided with main IED, each sub-IED systematic parameter, operational factor through the IEC61850 agreement, makes the instruction operation of all IED according to the station level server.
Partial discharge of transformer is monitored the high frequency electromagnetic wave signal that sub-IED utilizes the inner shelf depreciation generation of ultrahigh frequency (UHF) sensor acquisition transformer that is installed on the transformer operation hand hole, UHF sensing zone wide region 300M-1500MHz.Obtain the characteristic quantity of the reflection shelf depreciation orders of severity such as maximum pd quantity, discharge peak phase, unit interval discharge time through this sub-IED, so that transformer insulated defective is carried out early warning.
The sub-IED of transformer iron core grounding current utilizes the leakage current that is installed in the punching high sensitivity power current sensor acquisition transformer core ground connection on the iron core grounding line, and it is 1mA-10A that iron core grounding is measured range of current.Obtain the health status that the iron core grounding current size is assessed core inductance through this sub-IED, judge whether to exist multipoint earthing.
The sub-IED of transformer vibration monitoring monitors the vibration situation of transformer body through the vibration signal of gathering 3-6 vibration transducer.Measure degree that vibration signal changes everywhere according to transformer body and can judge whether defectiveness of Transformer Winding or iron core; The abnormal vibration of on-line monitoring power transformer is realized the detection and the location of transformer defective, and the vibration survey frequency range is 0.04-1500Hz.Judge through this sub-IED acquisition 100Hz, 200Hz, the equifrequent vibration amplitude of 300Hz whether winding distortion or loosening has taken place.
The sub-IED of bushing shell for transformer insulating monitoring can calculate through 3-6 group bottom shielding of bushing current sensor on-line measurement end screen Leakage Current and through the system voltage that voltage transformer (VT) is gathered and obtain sleeve pipe dielectric loss and electric capacity; Dielectric dissipation factor measurement range 0.001 ~ 0.3, equivalent capacitance measurement range 30PF-0.3 μ F.Obtain the dielectric loss and the electric capacity of 6 sleeve pipes simultaneously through this sub-IED, carry out state of insulation and variation tendency thereof that horizontal and vertical comparison can be grasped bushing for transformer.
On-load voltage regulating switch is monitored sub-IED and mainly the electric motor starting and the drive current of on-load voltage regulation mechanism is monitored and analyzed, motor drive current measurement range: 100mA-10A.When having bigger variation, drive current curve that obtains through this sub-IED and initial current curve can judge that possibly there is mechanical fault in on-load voltage regulation mechanism.
The sub-IED of winding optical fiber temperature-measurement utilize 3-6 fluorescent optical fiber sensor being embedded in the Transformer Winding directly, in real time, measuring transformer hot spot temperature of winding exactly, temperature-measuring range is-40 ℃-200 ℃.State of temperature amount through this sub-IED obtains judges whether Transformer Winding is overheated; And for the assessment of the state of insulation of current winding provides reference with cooling control system, thereby prolong transformer serviceable life, in peak hours guarantee electric power supply and make unplanned property or sudden accident drop to minimum level.
The sub-IED of little water monitoring is through going out to install in the oil micro-water content in little water sensor on-line measurement oil, little water gaging scope 2%～100%RH in the oil at fuel outlet valve.Judge the state of insulation of insulating oil through micro-water content in the oil of this sub-IED acquisition.
Transformer's Condition Monitoring master IED is the maincenter unit of intelligent transformer assembly monitoring function group; Its main task is according to the Monitoring Data that the sub-IED of each intellectual monitoring gathers transformer to be carried out comprehensive fault diagnosis and state estimation, simultaneously steering order and forwarding of data between the monitoring management platform of responsible station level server and the sub-IED of each intellectual monitoring.
Claims (9)
1. transformer running status comprehensive monitor system; It is characterized in that: comprise that transformer monitoring master intelligent electronic device and a plurality of sub-intelligent electronic device are respectively: the sub-intelligent electronic device of little water monitoring, partial discharge of transformer are monitored sub-intelligent electronic device, iron core grounding current and are monitored that sub-intelligent electronic device, the sub-intelligent electronic device of vibration monitoring, bushing for transformer are monitored sub-intelligent electronic device, on-load voltage regulating switch is monitored sub-intelligent electronic device in the sub-intelligent electronic device of winding temperature measurement, the oil; Wherein transformer monitoring master intelligent electronic device inserts transformer station's process layer network and transformer station's station level network; Be connected to the station level server through transformer station's station level network, said a plurality of sub-intelligent electronic devices insert transformer station's process layer network.
2. transformer running status comprehensive monitor system according to claim 1; It is characterized in that; Said sub-intelligent electronic device comprises: sensor, signal pre-processing circuit, microprocessor, supply module, data acquisition and storage system, IEC61850 communication system; Said sensor connects the A/D port of microprocessor through signal pre-processing circuit; Microprocessor is connected with storage system with supply module, data acquisition, and microprocessor also connects transformer monitoring master intelligent electronic device through said IEC61850 communication system.
3. transformer running status comprehensive monitor system according to claim 1 is characterized in that, said partial discharge of transformer is monitored sub-intelligent electronic device and comprised the uhf sensor that is installed on the transformer operation hand hole.
4. transformer running status comprehensive monitor system according to claim 1 is characterized in that said iron core grounding current is monitored sub-intelligent electronic device and comprised the punching high sensitivity power current sensor that is installed on the transformer core ground wire.
5. transformer running status comprehensive monitor system according to claim 1 is characterized in that the sub-intelligent electronic device of said vibration monitoring comprises 3-6 the vibration transducer that is installed on the transformer body.
6. transformer running status comprehensive monitor system according to claim 1 is characterized in that, said bushing for transformer is monitored sub-intelligent electronic device and comprised 3-6 group bottom shielding of bushing current sensor and voltage transformer (VT).
7. transformer running status comprehensive monitor system according to claim 1 is characterized in that, said on-load voltage regulating switch is monitored sub-intelligent electronic device and comprised the electric motor starting that detects on-load voltage regulation mechanism and the current sensor of drive current.
8. transformer running status comprehensive monitor system according to claim 1 is characterized in that the sub-intelligent electronic device of said winding temperature measurement comprises 3-6 the fluorescent optical fiber sensor that is embedded in the Transformer Winding.
9. transformer running status comprehensive monitor system according to claim 1 is characterized in that the sub-intelligent electronic device of little water monitoring comprises little water sensor in the oil that is installed on the fuel outlet valve place in the said oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220184546 CN202582602U (en) | 2012-04-26 | 2012-04-26 | Transformer running state comprehensive monitoring system |
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| CN 201220184546 CN202582602U (en) | 2012-04-26 | 2012-04-26 | Transformer running state comprehensive monitoring system |
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| CN 201220184546 Expired - Lifetime CN202582602U (en) | 2012-04-26 | 2012-04-26 | Transformer running state comprehensive monitoring system |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063968A (en) * | 2013-01-14 | 2013-04-24 | 中国能源建设集团广东省电力设计研究院 | Convertor station electrical equipment status integrated online monitoring system |
| CN103077813A (en) * | 2013-01-08 | 2013-05-01 | 四川电力科学研究院 | Novel intelligent transformer |
| CN103199621A (en) * | 2013-03-07 | 2013-07-10 | 安徽省电力公司芜湖供电公司 | On-line monitoring networking of power transformer of intelligent substation |
| CN103197180A (en) * | 2013-03-26 | 2013-07-10 | 国家电网公司 | Intelligent component used for gas insulated switchgear (GIS)/ breaker |
| CN103206984A (en) * | 2013-03-26 | 2013-07-17 | 国家电网公司 | Intelligent component for oil-immersed transformer |
| CN103217192A (en) * | 2013-03-26 | 2013-07-24 | 国家电网公司 | Intelligent assembly |
| CN103234576A (en) * | 2013-03-26 | 2013-08-07 | 国家电网公司 | State monitoring system for power devices in intelligent substations |
| CN103344855A (en) * | 2013-06-25 | 2013-10-09 | 国家电网公司 | Condition monitoring system of intelligent transformer substation |
| CN103605069A (en) * | 2013-11-12 | 2014-02-26 | 北京四方继保自动化股份有限公司 | Apparatus and method for realizing partial discharging monitoring of switch based on unconventional mutual inductor |
| CN104266679A (en) * | 2014-10-08 | 2015-01-07 | 国家电网公司 | Method and device for monitoring and diagnosing power transformer |
| CN104659778A (en) * | 2015-02-27 | 2015-05-27 | 国家电网公司 | Priority considered power quality and noise comprehensive evaluation method for convertor transformer |
| CN106404049A (en) * | 2016-08-26 | 2017-02-15 | 张振堂 | Environment monitoring system of high-voltage switchgear room |
| CN107328438A (en) * | 2017-07-03 | 2017-11-07 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of power transformer runs comprehensive monitor system |
| CN107367631A (en) * | 2017-06-20 | 2017-11-21 | 广东电网有限责任公司佛山供电局 | A kind of monitoring method of main transformer core earth current |
| CN107449568A (en) * | 2017-09-29 | 2017-12-08 | 孙培丽 | A kind of oil-filled transformer pressurized seal detecting system |
| CN107589356A (en) * | 2017-10-19 | 2018-01-16 | 桂林师范高等专科学校 | Transformer insulated property detection means |
| CN108152653A (en) * | 2017-12-29 | 2018-06-12 | 国网山东省电力公司日照供电公司 | Transformer fault monitoring device and system |
| CN109541412A (en) * | 2018-12-20 | 2019-03-29 | 国网上海市电力公司 | Transformer overvoltage and partial discharge comprehensive monitor system and method based on bottom shielding of bushing |
| CN109856488A (en) * | 2019-03-15 | 2019-06-07 | 长沙理工大学 | A kind of Transformer State Assessment and fault detection method based on multisource data fusion |
| CN111307218A (en) * | 2020-03-16 | 2020-06-19 | 国网河南省电力公司电力科学研究院 | Transformer bushing monitoring system |
| CN112598298A (en) * | 2020-12-25 | 2021-04-02 | 武汉瑞莱保科技有限公司 | Power transformer health management system and management method |
| CN113124929A (en) * | 2021-04-13 | 2021-07-16 | 国网陕西省电力公司铜川供电公司 | Transformer substation multi-parameter signal acquisition comprehensive analysis system and method |
| CN113945838A (en) * | 2021-10-21 | 2022-01-18 | 国电青山热电有限公司 | Online transformer and booster station intelligent monitoring method and system |
| WO2023093660A1 (en) * | 2021-11-23 | 2023-06-01 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation device and method based on non-power cut detection |
-
2012
- 2012-04-26 CN CN 201220184546 patent/CN202582602U/en not_active Expired - Lifetime
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077813A (en) * | 2013-01-08 | 2013-05-01 | 四川电力科学研究院 | Novel intelligent transformer |
| CN103063968A (en) * | 2013-01-14 | 2013-04-24 | 中国能源建设集团广东省电力设计研究院 | Convertor station electrical equipment status integrated online monitoring system |
| WO2014135015A1 (en) * | 2013-03-07 | 2014-09-12 | 国网安徽省电力公司芜湖供电公司 | Network for online monitoring of power transformer at intelligent substation |
| CN103199621A (en) * | 2013-03-07 | 2013-07-10 | 安徽省电力公司芜湖供电公司 | On-line monitoring networking of power transformer of intelligent substation |
| CN103199621B (en) * | 2013-03-07 | 2015-11-11 | 国家电网公司 | The networking of power transformer of intelligent substation on-line monitoring |
| CN103197180A (en) * | 2013-03-26 | 2013-07-10 | 国家电网公司 | Intelligent component used for gas insulated switchgear (GIS)/ breaker |
| CN103234576A (en) * | 2013-03-26 | 2013-08-07 | 国家电网公司 | State monitoring system for power devices in intelligent substations |
| CN103217192A (en) * | 2013-03-26 | 2013-07-24 | 国家电网公司 | Intelligent assembly |
| CN103206984A (en) * | 2013-03-26 | 2013-07-17 | 国家电网公司 | Intelligent component for oil-immersed transformer |
| CN103344855A (en) * | 2013-06-25 | 2013-10-09 | 国家电网公司 | Condition monitoring system of intelligent transformer substation |
| CN103605069A (en) * | 2013-11-12 | 2014-02-26 | 北京四方继保自动化股份有限公司 | Apparatus and method for realizing partial discharging monitoring of switch based on unconventional mutual inductor |
| CN103605069B (en) * | 2013-11-12 | 2016-03-30 | 北京四方继保自动化股份有限公司 | The apparatus and method of switch partial discharge monitoring are realized based on unconventional mutual inductor |
| CN104266679A (en) * | 2014-10-08 | 2015-01-07 | 国家电网公司 | Method and device for monitoring and diagnosing power transformer |
| CN104659778A (en) * | 2015-02-27 | 2015-05-27 | 国家电网公司 | Priority considered power quality and noise comprehensive evaluation method for convertor transformer |
| CN106404049A (en) * | 2016-08-26 | 2017-02-15 | 张振堂 | Environment monitoring system of high-voltage switchgear room |
| CN107367631A (en) * | 2017-06-20 | 2017-11-21 | 广东电网有限责任公司佛山供电局 | A kind of monitoring method of main transformer core earth current |
| CN107328438A (en) * | 2017-07-03 | 2017-11-07 | 国网黑龙江省电力有限公司哈尔滨供电公司 | A kind of power transformer runs comprehensive monitor system |
| CN107449568A (en) * | 2017-09-29 | 2017-12-08 | 孙培丽 | A kind of oil-filled transformer pressurized seal detecting system |
| CN107589356A (en) * | 2017-10-19 | 2018-01-16 | 桂林师范高等专科学校 | Transformer insulated property detection means |
| CN108152653A (en) * | 2017-12-29 | 2018-06-12 | 国网山东省电力公司日照供电公司 | Transformer fault monitoring device and system |
| CN109541412A (en) * | 2018-12-20 | 2019-03-29 | 国网上海市电力公司 | Transformer overvoltage and partial discharge comprehensive monitor system and method based on bottom shielding of bushing |
| CN109856488A (en) * | 2019-03-15 | 2019-06-07 | 长沙理工大学 | A kind of Transformer State Assessment and fault detection method based on multisource data fusion |
| CN111307218A (en) * | 2020-03-16 | 2020-06-19 | 国网河南省电力公司电力科学研究院 | Transformer bushing monitoring system |
| CN112598298A (en) * | 2020-12-25 | 2021-04-02 | 武汉瑞莱保科技有限公司 | Power transformer health management system and management method |
| CN113124929A (en) * | 2021-04-13 | 2021-07-16 | 国网陕西省电力公司铜川供电公司 | Transformer substation multi-parameter signal acquisition comprehensive analysis system and method |
| CN113945838A (en) * | 2021-10-21 | 2022-01-18 | 国电青山热电有限公司 | Online transformer and booster station intelligent monitoring method and system |
| WO2023093660A1 (en) * | 2021-11-23 | 2023-06-01 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation device and method based on non-power cut detection |
| JP7461568B2 (en) | 2021-11-23 | 2024-04-03 | 国網山西省電力公司電力科学研究院 | Apparatus and method for evaluating the degree of deformation of transformer windings based on uninterruptible power failure detection |
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| C14 | Grant of patent or utility model | ||
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| CP03 | Change of name, title or address |
Address after: 214500, No. 2, Jianan Road, Jingjiang, Jiangsu, Taizhou Patentee after: Jiangsu Chun long photoelectric Polytron Technologies Inc Address before: 214500 Jiangsu city of Taizhou province Jingjiang City Huaxin apartment (South Loop School East) Patentee before: Jiangsu Junlong Electric Power Technology Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20121205 |
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| CX01 | Expiry of patent term |