CN105259464B - Electric transmission line isolator distribution leakage current monitoring device - Google Patents
Electric transmission line isolator distribution leakage current monitoring device Download PDFInfo
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- CN105259464B CN105259464B CN201510757193.XA CN201510757193A CN105259464B CN 105259464 B CN105259464 B CN 105259464B CN 201510757193 A CN201510757193 A CN 201510757193A CN 105259464 B CN105259464 B CN 105259464B
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- leakage current
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Abstract
The invention discloses electric transmission line isolator distribution leakage current monitoring devices, it is characterized in that, including several monitoring rings, operating office, the monitoring ring is communicated with the operating office by radio communication, on the steel cap of the monitoring ring set loaded on electric transmission line isolator upper surface, it is provided with insulating part below the steel cap, the operating office is set to several and is equipped between the electric power line pole tower of the monitoring ring, the monitoring ring is used for recording the amplitude of insulator leakage current and insulator leakage current amplitude information is sent to the operating office by radio communication, the operating office is used for controlling several described monitoring rings and summarizing that insulator Leakage Current amplitude information is sent to remote terminal to monitor insulator state at any time.The present invention monitors insulator dirty degree by monitoring insulator leakage current, carries out pre-warning, avoids the generation of electric transmission line isolator pollution flashover, ensures power system security stable operation.
Description
Technical field
The present invention relates to a kind of electric transmission line isolator distribution leakage current monitoring devices, belong to electric transmission line isolator
On-line monitoring technique field.
Background technology
Electric transmission line isolator is chronically exposed to open air, is influenced due to falling the factors such as ash, industrial pollution naturally, surface can be attached
Dirty shifting object, pollution layer is formed.Under drying regime, pollution layer generally will not be conductive, and External Insulation electric property influences smaller；But wet
It spends under larger environment, pollution layer meeting moisture absorption is made moist so that the soluble electrolyte dissolution in pollution layer, pollution layer start conduction, filthy
Insulator surface will flow through the leakage current of certain amplitude, gradually develop to shelf depreciation.When the development of electric arc runs through insulator
When upper and lower two electrodes, flashover occurs for insulating surface, causes pollution flashover phenomenon.Pollution flashover accident mostly occurs under working voltage, warp
A wide range of power outages accident is often resulted in, it is very harmful to the safe operation of electric system.According to statistics, 20th century 80 to the nineties, dirty
It dodges accident number and occupies the 2nd in power grid accident total degree, be only second to lightening hazard, and pollution flashover accident is typically trans-regional big face
Long-pending accident, caused by loss be 10 times of lightening hazard, harm is much larger than other type electric network faults.Transmission line insulator
Sub- pollution flashover is one of the problem for hindering safe operation of power system.Therefore, in order to avoid the hair of electric transmission line isolator pollution flashover
It is raw, it needs to monitor the pollution degree of insulator on-line, early warning is carried out to the pollution flashover of insulator.
Mainly there is the side of the leakage current of monitoring insulator about the on-line monitoring of electric transmission line isolator pollution degree at present
Method.Insulator leakage current refers to the electricity for flowing through insulator surface pollution layer that filth is measured by the time of tide under working voltage effect
Stream.When one timing of voltage and weather conditions, insulator surface leakage current is directly proportional to filthy severity.Insulator leakage electricity
Stream determines relationship between pollution flashover voltage there is apparent, can largely estimate and predict the pollution flashover electricity of insulator
The filth of pressure and evaluation insulator is horizontal.Therefore, the leakage current for monitoring insulator is carried out online to insulator dirty degree
Monitor most efficient method.
The related patents about the leakage current of monitoring insulator have at present.CN200910190853 provides friendship
Ultra-high-tension power transmission line contaminated insulator leakage current sensor is flowed, live handling are facilitated, measures leakage current precision height, frequency band
Width, the linearity are good.CN201210297103 provides photoelectric type ultrahigh voltage direct-current insulator leakage current monitoring system, using light
Fine transport leaks current data.CN201210535143 provides a kind of extra-high voltage direct current insulator leakage current measuring system,
Have many advantages, such as high speed, safe and reliable measurement, especially suitable for wild environment operation.CN201410257722 provides one kind
The method for exchanging the on-Line Monitor Device of insulator leakage and corona pulse electric current and being monitored on-line using the device, is realized
To the real-time accurate measurements of insulator virtual condition.To sum up, the method cost of monitoring leakage electric current is higher at present, and single device is only
Electric current at one can be measured, many places measurement cost is high；In addition, sensor is connected with equipment, there are great security risks.Therefore,
Need the more economical safe and practical monitoring method of research.
Invention content
It is an object of the invention to overcome defect of the existing technology, propose that a kind of electric transmission line isolator distribution is let out
Leakage current monitoring device.
The present invention adopts the following technical scheme that：Electric transmission line isolator distribution leakage current monitoring device, feature exist
In, including several monitoring ring, operating offices, the monitoring ring communicated with the operating office by radio communication, the prison
It surveys on steel cap of the ring set loaded on electric transmission line isolator upper surface, insulating part, the operating office is provided with below the steel cap
It is set to several to be equipped between the electric power line pole tower of the monitoring ring, the monitoring ring is used for recording insulator leakage electricity
Insulator leakage current amplitude information is simultaneously sent to the operating office by the amplitude of stream by radio communication, and the operating office is used for
It controls several described monitoring rings and summarizes and insulator Leakage Current amplitude information is sent to remote terminal to monitor at any time absolutely
Edge state.
Preferably, the monitoring ring includes PVC plastic, iron-clad, and the right side of the PVC plastic and the right side of the iron-clad are logical
Clamp is crossed to be connected, the left side of the PVC plastic is connected with the button that passes on left of the iron-clad, the PVC plastic it is interior
Portion is provided with coil, iron core, and the coil is wound on the iron core, and the inner surface of the iron core is provided with rubber, institute
It states rubber to be nested on the steel cap, the iron-clad is internally provided with circuit module, accumulator, and day is provided on the iron-clad
Line；The coil is used for acquiring the leakage current of insulator.
Preferably, the monitoring ring further includes A/D conversion modules, MCU processor of single chip computer, ZigBee radio communication molds
Block, the circuit module include rectification circuit, peak sampling hold circuit；The coil successively with the rectification circuit, described
Peak sampling hold circuit, the A/D conversion modules, MCU processor of single chip computer, ZigBee wireless communication modules are connected, institute
The effect for stating rectification circuit is to convert ac leakage current waveform to DC waveform, the effect of the peak sampling hold circuit
It is to obtain the amplitude information of leakage current from the waveform of leakage current, the effect of the A/D conversion modules is to turn analog signal
Digital signal is turned to, the effect of the MCU processor of single chip computer is processing data, controls the monitoring ring work, described
The effect of ZigBee wireless communication modules is carried out wireless communication with the operating office, and the accumulator is carried to the circuit module
For electric energy, the antenna is for wirelessly communicating.
Preferably, the monitoring ring is in horse-hof shape, and the PVC plastic is ellipse, and the iron-clad is rodlike.
Preferably, the operating office include ZigBee wireless communication modules, MCU processor of single chip computer, GPS positioning module,
GPRS wireless communication modules, accumulator, solar cell, humidity sensor, the MCU processor of single chip computer respectively with it is described
ZigBee wireless communication modules, GPS positioning module, GPRS wireless communication modules, humidity sensor are connected, the solar-electricity
Pond is used for being powered to the operating office with the accumulator；The ZigBee wireless communication modules are used for and the monitoring ring
It carries out wireless communication, the GPS positioning module is used for obtaining the geographical location information of the monitoring ring, and the humidity sensor is used
Detect the humidity of environment, the effect of the MCU processor of single chip computer is aggregation process leakage current information, and the GPRS is wireless
The effect of communication module is carried out wireless communication with remote terminal.
Preferably, each monitoring ring is both provided with unique ID, and the operating office controls monitoring by controlling ID
The suspend mode and work of ring.
The advantageous effect that the present invention is reached：（1）The present invention provides electric transmission line isolator distribution leakage current prisons
Device is surveyed, insulator dirty degree is monitored by monitoring insulator leakage current, carries out pre-warning, avoid transmission line insulator
The generation of sub- pollution flashover ensures power system security stable operation；（2）Monitoring device function control power is in operating office, a communication
The leakage current information of many places monitoring ring can be monitored by standing；（2）The characteristic quantity that leakage current monitoring device is monitored is leakage current
Amplitude, it is simple and effective reliable；（3）Information is sent by radio communication between monitoring ring and operating office, it is convenient and efficient energy saving；（4）
Monitoring ring is typically in dormant state, and operating office is needed to wake up just work monitoring insulator leakage current, power and energy saving.
Description of the drawings
Fig. 1 be the present invention overall structure diagram, wherein 11- monitor ring, 12- electric transmission line isolators, 13- conducting wires,
14- cross-arms, 15- operating offices.
Fig. 2 is the course of work schematic diagram of the monitoring ring of the present invention, and wherein 21- coils, 22- iron cores, 23- transmission lines of electricity is exhausted
Edge, 24- rectification circuits, 25- peak sampling hold circuits, 26-A/D conversion modules, 27- MCU processor of single chip computer, 28-
ZigBee wireless communication modules, 29- accumulators.
Fig. 3 be the present invention monitoring ring structural schematic diagram, wherein 301-PVC plastics, 302- coils, 303- iron cores,
304- rubber, 305- buttons, 306- clamps, 307- iron-clads, 308- antennas, 309- circuit modules, 310- accumulators.
Fig. 4 is the installation schematic top plan view of the monitoring ring of the present invention, wherein 41- steel cap, 42- monitorings ring, 43- insulating parts.
Fig. 5 is the connection diagram of the operating office of the present invention, wherein 51-ZigBee wireless communication modules, 52-MCU monolithics
Machine processor, 53-GPS locating modules, 54-GPRS wireless communication modules, 55- accumulators, 56- solar cells, 57- humidity pass
Sensor.
Fig. 6 is the communication process schematic diagram of the monitoring ring and operating office of the present invention, and wherein 61- operating offices, 62- monitors ring.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Fig. 1 is the overall structure diagram of the present invention, and wherein 11- monitorings ring, 12- transmission circuit insulator strings, 13- are led
Line, 14- cross-arms, 15- operating offices.The present invention adopts the following technical scheme that：Electric transmission line isolator distribution leakage current monitors
Device, which is characterized in that including several monitoring ring 11, operating office 15, monitoring ring 11 by radio communication with operating office 15 into
Row communication, monitoring ring 11 are set on the steel cap of 12 upper surface of electric transmission line isolator, are provided with insulating part below steel cap, are led to
News station 15 is set to several and is equipped between the electric power line pole tower of monitoring ring 11, and monitoring ring 11 is used for recording insulator leakage
Insulator leakage current amplitude information is simultaneously sent to operating office 15 by the amplitude of electric current by radio communication, and operating office 15 is used for controlling
It makes several monitoring rings 11 and summarizes and insulator Leakage Current amplitude information is sent to remote terminal to monitor insulator at any time
State.
Monitoring ring 11 and operating office 15 constitute the on-line monitoring system of electric transmission line isolator leakage current, whole system
Function control power has unique ID in operating office 15, monitoring 11 multiple spot of ring arrangement, each monitoring ring 11, and operating office 15 passes through ID
The specific monitoring ring 11 of control acquires leakage current information.Pass through ZigBee radio communication molds between monitoring ring 11 and operating office 15
Block is communicated.
Fig. 2 is the course of work schematic diagram of the monitoring ring of the present invention, and wherein 21- coils, 22- iron cores, 23- transmission lines of electricity is exhausted
Edge, 24- rectification circuits, 25- peak sampling hold circuits, 26-A/D conversion modules, 27- MCU processor of single chip computer, 28-
ZigBee wireless communication modules, 29- accumulators.Coil 21 turns with rectification circuit 24, peak sampling hold circuit 25, A/D successively
Mold changing block 26, MCU processor of single chip computer 27, ZigBee wireless communication modules 28 are connected, and the effect of rectification circuit 24 is will to hand over
It flows leakage current waveform and is converted into DC waveform, the effect of peak sampling hold circuit 25 is let out from the waveform of leakage current
The amplitude information of leakage current, the effect of A/D conversion modules 26 are to convert analog signal to digital signal, the processing of MCU microcontrollers
The effect of device 27 is processing data, control monitoring ring work, and the effect of ZigBee wireless communication modules 28 is carried out with operating office
Wireless communication, accumulator 29 provide electric energy to circuit module.
Fig. 3 be the present invention monitoring ring structural schematic diagram, wherein 301-PVC plastics, 302- coils, 303- iron cores,
304- rubber, 305- buttons, 306- clamps, 307- iron-clads, 308- antennas, 309- circuit modules, 310- accumulators.Fig. 4 is this
The installation schematic top plan view of the monitoring ring of invention, wherein 41- steel cap, 42- monitorings ring, 43- insulating parts.It is in horseshoe to monitor ring 42
Shape, PVC plastic 301 are ellipse, and iron-clad 307 is rodlike.It includes PVC plastic 301, iron-clad 307, PVC plastic 301 to monitor ring 42
Right side be connected by clamp 306 with the right side of iron-clad 307, the left side of PVC plastic 301 passes on left button with iron-clad 307
Son 305 is connected, and PVC plastic 301 is internally provided with coil 302, iron core 303, and coil 302 is wound on iron core 303,
The inner surface of iron core 303 is provided with rubber 304, and rubber 304 is nested on steel cap 41, and iron-clad 307 is internally provided with circuit module
309, accumulator 310 are provided with antenna 308 on iron-clad 307；Coil 302 is used for acquiring the leakage current of insulator, antenna 308
For wirelessly communicating.
302 material of coil uses copper enameled wire, single-ended opening to be wound on iron core 303 using continous way winding, iron core
It is PVC plastic 301 with 303 outside of iron core that 303 materials, which use silicon steel sheet, coil 302,.Bar-like portion is iron-clad 307, the inside installation
There are circuit module 309 and accumulator 310, reduce interference, coil 302 accesses circuit module 309.Oval part exists with bar-like portion
Left side is connected by a button 305, can be movable, is formed an opening and is entangled steel cap 41, is then closed.On right side
It is to be locked two parts by a clamp 306.One feature of monitoring ring 42 is, in closed state, right in oval part
Side iron core 303 is contacted with rodlike iron-clad 307, reduces iron core magnetic resistance, increases sensitivity, but left part is not in contact with existing
5mm is obstructed（PVC shells）, eliminate the magnetically saturated influence of iron.It is rubber 304 to monitor 42 inside of ring, for reducing monitoring ring 42
Hard with steel cap 41 contacts, monitoring for protection ring 42, while increasing friction, is close to steel cap 41 conducive to monitoring ring 42.Ring 42 is monitored to pacify
On 43 upper surface of low-pressure end first insulator and it is stuck on steel cap 41.
Fig. 5 is the connection diagram of the operating office of the present invention, wherein 51-ZigBee wireless communication modules, 52-MCU monolithics
Machine processor, 53-GPS locating modules, 54-GPRS wireless communication modules, 55- accumulators, 56- solar cells, 57- humidity pass
Sensor.Operating office includes ZigBee wireless communication modules, MCU processor of single chip computer, GPS positioning module, GPRS radio communication molds
Block, accumulator, solar cell, humidity sensor, MCU processor of single chip computer are fixed with ZigBee wireless communication modules, GPS respectively
Position module, GPRS wireless communication modules, humidity sensor are connected, and solar cell is used for being supplied to operating office with accumulator
Electricity；ZigBee wireless communication modules are used for carrying out wireless communication with monitoring ring, and GPS positioning module is used for obtaining the geography of monitoring ring
Location information, humidity sensor are used for detecting the humidity of environment, and the effect of MCU processor of single chip computer is aggregation process leakage current
Information, the effect of GPRS wireless communication modules are carried out wireless communication with remote terminal.
ZigBee wireless communication modules 51 obtain the ZigBee wireless communication modules 28 from monitoring ring 11 and pass in operating office 15
Pass the leakage current amplitude information come.Leakage current amplitude information is sent to MCU microcontrollers by ZigBee wireless communication modules 51
Geographical location information is sent to MCU processor of single chip computer 52, MCU processor of single chip computer 52 by processor 52, GPS positioning module 53
These information of aggregation process are simultaneously sent to GPRS wireless communication modules 54.GPRS wireless communication modules 54 will be by aggregation process
Leakage current amplitude information is sent to remote terminal to monitor insulator state at any time.
Humidity sensor 57 in operating office 15 is used for the humidity of monitoring of environmental, when humidity is more than 90%, illustrates now outer
Boundary's environmental benefits develop in pollution flashover, and operating office 15 sends out a wake-up signal wake-up monitoring ring 11 to supervise per hour to monitoring ring 11
Survey leakage current；When humidity is less than 90%, operating office 15 no longer sends out wake-up signal, operating office 15 and monitoring to monitoring ring 11
Ring 11 is all in dormant state, power and energy saving.
Fig. 6 is the communication process schematic diagram of the monitoring ring and operating office of the present invention, and wherein 61- operating offices, 62- monitors ring.
Each monitoring ring 62 is both provided with unique ID, and operating office 61 controls the suspend mode and work of monitoring ring 62 by controlling ID.
Pass through ZigBee wireless communication modules 28 between monitoring ring 62 and operating office 61（51）It is communicated.First, work as ring
When border humidity is more than 90%, operating office 61 sends out wake-up signal to monitoring ring 62,1. operating office 61 sends out signal（Monitor the ID of ring
Information）To monitoring ring 62,62 return signal of monitoring ring is 2.（Monitor the id information of ring）To operating office 61, monitoring ring 62 is waken up；
When ambient humidity is less than 90%, operating office 61 does not wake up monitoring ring 62；Then, 3. operating office 61 sends out signal（Sense command,
It needs to detect leakage current information）To monitoring ring 62,62 return signal of monitoring ring is 4.（Leakage current information）To operating office 61, lead to
News station 61 obtains the amplitude information of leakage current；Finally, 5. operating office 61 sends out signal to monitoring ring 62（Suspend mode）, operating office 61
Terminate with the current communication process of monitoring ring 62.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (5)
1. electric transmission line isolator distribution leakage current monitoring device, which is characterized in that including several monitoring ring, communications
It stands, the monitoring ring is communicated with the operating office by radio communication, and the monitoring ring set is loaded on electric transmission line isolator
On the steel cap of upper surface, insulating part is provided with below the steel cap, the operating office is set to several and is equipped with the prison
It surveys between the electric power line pole tower of ring, the monitoring ring is used for recording the amplitude of insulator leakage current and insulator is leaked electricity
Stream amplitude information is sent to the operating office by radio communication, and the operating office is used for controlling several described monitoring rings and converging
Insulator Leakage Current amplitude information is always sent to remote terminal to monitor insulator state at any time；
The monitoring ring includes PVC plastic, iron-clad, and the right side of the PVC plastic is connected with the right side of the iron-clad by clamp
It connects, the left side of the PVC plastic is connected with the button that passes on left of the iron-clad, and the PVC plastic is internally provided with line
Circle, iron core, the coil are wound on the iron core, and the inner surface of the iron core is provided with rubber, and the rubber is nested
On the steel cap, the iron-clad is internally provided with circuit module, accumulator, and antenna is provided on the iron-clad；The coil
For acquiring the leakage current of insulator；The monitoring ring in closed state, the institute on right side in the monitoring ring ellipse part
It states iron core to contact with the iron-clad, reduces the magnetic resistance of the iron core, increase sensitivity, but the left part of the monitoring ring
The iron core is with the iron-clad not in contact with there are the barriers of the PVC plastic of 5mm, eliminate the magnetically saturated influence of iron.
2. electric transmission line isolator distribution leakage current monitoring device according to claim 1, which is characterized in that described
It further includes A/D conversion modules, MCU processor of single chip computer, ZigBee wireless communication modules to monitor ring, and the circuit module includes whole
Current circuit, peak sampling hold circuit；The coil successively with the rectification circuit, peak sampling hold circuit, described
A/D conversion modules, MCU processor of single chip computer, ZigBee wireless communication modules are connected, and the effect of the rectification circuit is will to hand over
It flows leakage current waveform and is converted into DC waveform, the effect of the peak sampling hold circuit is obtained from the waveform of leakage current
The amplitude information of leakage current, the effect of the A/D conversion modules are to convert analog signal to digital signal, and the MCU is mono-
The effect of piece machine processor is processing data, the control monitoring ring work, and the effect of the ZigBee wireless communication modules is
It is carried out wireless communication with the operating office, the accumulator provides electric energy to the circuit module, and the antenna is used for channel radio
Letter.
3. electric transmission line isolator distribution leakage current monitoring device according to claim 1, which is characterized in that described
It is in horse-hof shape to monitor ring, and the PVC plastic is ellipse, and the iron-clad is rodlike.
4. electric transmission line isolator distribution leakage current monitoring device according to claim 1, which is characterized in that described
Operating office includes ZigBee wireless communication modules, MCU processor of single chip computer, GPS positioning module, GPRS wireless communication modules, stores
Battery, solar cell, humidity sensor, the MCU processor of single chip computer respectively with the ZigBee wireless communication modules,
GPS positioning module, GPRS wireless communication modules, humidity sensor are connected, and the solar cell is used for the accumulator
It is powered to the operating office；The ZigBee wireless communication modules are used for carrying out wireless communication with the monitoring ring, described
GPS positioning module is used for obtaining the geographical location information of the monitoring ring, and the humidity sensor is used for detecting the humidity of environment,
The effect of the MCU processor of single chip computer is aggregation process leakage current information, and the effect of the GPRS wireless communication modules is
It is carried out wireless communication with remote terminal.
5. electric transmission line isolator distribution leakage current monitoring device according to claim 1, which is characterized in that each
The monitoring ring is both provided with unique ID, and the operating office controls the suspend mode and work of monitoring ring by controlling ID.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510757193.XA CN105259464B (en) | 2015-11-09 | 2015-11-09 | Electric transmission line isolator distribution leakage current monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510757193.XA CN105259464B (en) | 2015-11-09 | 2015-11-09 | Electric transmission line isolator distribution leakage current monitoring device |
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| CN105259464A CN105259464A (en) | 2016-01-20 |
| CN105259464B true CN105259464B (en) | 2018-11-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106932635A (en) * | 2017-04-06 | 2017-07-07 | 漳州市东方智能仪表有限公司 | A kind of on-vehicle battery detector |
| CN107271833A (en) * | 2017-06-05 | 2017-10-20 | 江苏尚坤电力安装有限公司 | A kind of electric transmission line isolator On-line Monitoring of Leakage Current method and its system |
| CN107505531A (en) * | 2017-08-10 | 2017-12-22 | 中国科学院上海高等研究院 | A kind of earth detector, insulator earth detector, system and method |
| CN109031024A (en) * | 2018-08-17 | 2018-12-18 | 国网江苏省电力有限公司盐城供电分公司 | A kind of current leakage detection system and its detection method based on power grid |
| CN111679161A (en) * | 2020-04-28 | 2020-09-18 | 中国电力科学研究院有限公司 | Device and method for evaluating insulation state of composite cross arm insulator |
| CN117330883B (en) * | 2023-12-01 | 2024-02-27 | 国网山西省电力公司电力科学研究院 | Overhead line insulator running state monitoring system and method |
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Address after: 210000, Jiangsu, Jiangning Development Zone, Nanjing, the source of the road, No. 58, -5 Applicant after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. MAINTENANCE BRANCH Applicant after: WUHAN University Address before: 210000, Jiangsu, Jiangning Development Zone, Nanjing, the source of the road, No. 58, -5 Applicant before: MAINTENANCE DIVISION OF STATE GRID JIANGSU ELECTRIC POWER Co. Applicant before: Wuhan University Address after: 210000, Jiangsu, Jiangning Development Zone, Nanjing, the source of the road, No. 58, -5 Applicant after: MAINTENANCE DIVISION OF STATE GRID JIANGSU ELECTRIC POWER Co. Applicant after: WUHAN University Address before: 210000, Jiangsu, Jiangning Development Zone, Nanjing, the source of the road, No. 58, -5 Applicant before: JIANGSU ELECTRIC POWER COMPANY MAINTENANCE BRANCH Applicant before: Wuhan University |
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