CN202217010U - Online monitoring device of grounding current of transformer iron core - Google Patents
Online monitoring device of grounding current of transformer iron core Download PDFInfo
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- CN202217010U CN202217010U CN201120265765XU CN201120265765U CN202217010U CN 202217010 U CN202217010 U CN 202217010U CN 201120265765X U CN201120265765X U CN 201120265765XU CN 201120265765 U CN201120265765 U CN 201120265765U CN 202217010 U CN202217010 U CN 202217010U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000012806 monitoring device Methods 0.000 title abstract description 7
- 230000003750 conditioning effect Effects 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 abstract description 23
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
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- 230000002159 abnormal effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
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- 238000007689 inspection Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000013500 data storage Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
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Abstract
The utility model provides an online monitoring device of grounding currents of a transformer iron core. It is characterized in that the device includes a controller, a real-time clock system, a voltage signal regulating circuit, a tap position switching control circuit, a current voltage converting circuit and a feed through current inductor. The feed through current inductor is connected to the current voltage converting circuit. The current voltage converting circuit is connected to the tap position switching control circuit. The tap position switching control circuit is connected to the voltage signal regulating circuit. The voltage signal regulating circuit and the real-time clock system are connected to the controller. The online monitoring device of the grounding currents of the transformer iron core in the utility model can be widely applied to online monitoring of the grounding currents of iron cores or clamping pieces of electric devices such as transformers, reactors and the like.
Description
Technical field
The utility model belongs to transformer online monitoring field, is related to a kind of intelligent transformer iron core grounding current and apparatus for fixing transformer earth current on-Line Monitor Device, especially a kind of transformer iron core grounding current on-Line Monitor Device.
Background technology
Power transformer is one of crucial equipment in power system, is also the higher link of fault rate in power equipment, its normal operation is power system security, reliability, high-quality, the important guarantee of economical operation.When power transformer is normally run, iron core must have and only have some reliable grounds, when 2 points of iron core or multipoint earthing, circulation can be produced in core interior, causes hot-spot, iron core localized burn can be caused when serious, even ground strip is set to fuse, cause iron core electric potential floating, produce discharging fault, the reliability service of serious threat transformer and power network.
When transformer is normally run, iron core grounding current is milliampere level, and when multipoint earth faults occur for iron core, iron core grounding current can substantially increase.Shown according to actual operating data, under normal circumstances, the iron core grounding current of transformer only has several milliamperes~tens milliamperes, according to regulatory requirements, when iron core grounding current reaches 100 milliamperes, must just take corresponding measure to be handled.
The means of current operations staff's detection iron core grounding current are mainly measured using clamp on amperemeter to the current data of iron core grounding lead-out wire, but live electromagnetic interference is big, it is difficult to ensure that the precision and accuracy of clamp on amperemeter measurement data, and regular visit can not ensure to find multipoint earthing of iron core failure in time.
The content of the invention
Utility model purpose：The utility model provides a kind of transformer iron core grounding current on-Line Monitor Device, the purpose is to solve present in the transformer core grounding status method in conventional monitoring running status it is difficult to ensure that measurement data precision and accuracy the problem of and regular visit can not ensure to find multipoint earthing of iron core failure in time the problem of.
Technical scheme：The utility model is achieved through the following technical solutions：
Transformer iron core grounding current on-Line Monitor Device, it is characterised in that：The device includes controller, Real Time Clock System, voltage signal conditioning circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer；The straight-through current transformer is connected to current-to-voltage converting circuit, current-to-voltage converting circuit is connected to gear switch control circuit, gear switch control circuit is connected to voltage signal conditioning circuit, and voltage signal conditioning circuit and Real Time Clock System are connected to controller.
The device also includes display screen and FLASH memory；Display screen and FLASH memory are connected to controller.
Data communication system is also associated with the controller.
Controller, Real Time Clock System, voltage signal conditioning circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer are arranged in housing, and display screen is arranged on the top cover of housing.
The no-load voltage ratio of straight-through current transformer is 1000:1；It is 0-100mA, 100mA-1A and 1A-10A that gear switch, which controls the range of the switching of circuit,.
Advantage and effect：The utility model provides a kind of transformer iron core grounding current on-Line Monitor Device, it is characterised in that：The device includes controller, Real Time Clock System, voltage signal conditioning circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer；The straight-through current transformer is connected to current-to-voltage converting circuit, current-to-voltage converting circuit is connected to gear switch control circuit, gear switch control circuit is connected to voltage signal conditioning circuit, and voltage signal conditioning circuit and Real Time Clock System are connected to controller.
Transformer iron core grounding current on-Line Monitor Device designed by the utility model can be used for the monitoring of transformer iron core grounding current and folder electric current.This on-Line Monitor Device includes the iron core grounding current lead-out wire installed in transformer body, the earth current lead-out wire is connected after passing through straight-through current transformer with transformer grounding end, the secondary induced signal of straight-through current transformer accesses the measuring circuit of on-Line Monitor Device, measuring circuit is by current-to-voltage converting circuit, gear switch controls circuit and voltage signal conditioning circuit to constitute, measuring circuit is connected with controller, controller carries out the analog signal of measuring circuit after calculating processing, the display screen carried by device shows final measurement data, and the measurement data is stored in the storage device that device is carried, Data safeguard is provided for analysis transformer iron core grounding current running status, the present apparatus can be with comprehensive monitoring unit（Main IED）Or computer is connected, and measurement result is uploaded by MODBUS communication protocols, computer can be configured by serial ports to parameters such as the communication of device, measurement, alarm, calibrations.
This monitoring device has iron core grounding current data monitoring and overload alarm function in real time, alarming value can be by user's self-defining, when there are abnormal conditions, the display screen of device and the computer of remote monitoring can send alarm signal, staff is set to take treatment measures in time, avoid the generation of transformer fault, it is ensured that the stable operation of power system.
By the implementation of technical solutions of the utility model, the real-time measurement that really can stablize to the accurate of transformer iron core grounding current.The utility model method for designing has following innovative point：
1）The innovation of measuring method：
（1）The present apparatus is that the method being sleeved on by using high-precision straight-through current transformer on transformer core grounding line obtains iron core grounding current signal, the current signal that this method is obtained can truly reflect the situation of change of iron core grounding current, and it is not electrically connected with transformer, the operation to transformer has no effect；
（2）The signal that Current Transformer Secondary is obtained is directly accessed measurement apparatus, and measurement apparatus carries out analysis calculating by Digital Signal Processing to current signal, and shows, storage measurement data is in a device.Facilitate operations staff in on-site-inspection data and transfer, analyze transformer iron core grounding current historical data.
（3）During transformer normal work, iron core grounding current size is in tens milliamperes of scopes, but when there are the anomalies such as 2 points of iron core or multipoint earthing, iron core grounding current can reach several amperes, excursion is very big, and in order to ensure the accuracy of measurement and the security of measurement apparatus, the present apparatus devises current range gearshift function, the scope changed according to phone, device can automatically adjust suitable gear to measure electric current.Present apparatus current measuring range is 10A to the maximum, and measurement accuracy is less than 1%, has fully met the requirement of iron core grounding current measurement range and precision.
2）Apparatus structure and mounting means：Iron core grounding current on-Line Monitor Device of the present utility model, current transformer and measurement apparatus are in a shell, and shell uses casting aluminium material, display window has been opened up in closure head, for observing current data, shell independent grounding, the electromagnetic interference for shielding the external world.
Present apparatus structure design is compact, good appearance, on mounting means, is directly installed on using by the suspension member of crust of the device by the way of transformer body, and installation method is easy, and safety is easy to operations staff to install, operation and maintenance.
3）Device comes with data display function, by temporal information and real-time current data display on a display screen, is observed when facilitating operations staff's inspection.When Monitoring Data is more prescribed a time limit, display screen notes display alarm information prompting patrol officer.
4）Device has data storage function, temporal information and real-time current data is stored in the FLASH memory that device is carried, data storage power down is not lost, and can continuously preserve the measurement data of more than 1 year.For analysis iron core grounding current historical data, understand iron core grounding current situation of change and foundation is provided.
5）Device supports RS-232/485 communication interfaces, and the multiple spot monitoring based on RS485 buses can be achieved.Using the good MODBUS-RTU communication protocols of industrial circle versatility, the information such as Monitoring Data and monitoring moment can be uploaded to by computer or comprehensive monitoring unit by communication protocol（Main IED）.
6）Computer or comprehensive monitoring unit can be passed through（Main IED）To device parameter（Such as unit address, baud rate, odd even effect, sampling time interval, overload alarm value, clock time etc.）Flexible configuration is carried out, facilitates device to access other on-line monitoring systems, meets the requirement of Different field.
7）Device has and computer or comprehensive monitoring unit（Main IED）Set time function, it is ensured that device monitoring time and the accuracy and uniformity of equipment actual run time.
8）The design of electromagnetism interference and surge protection circuit.Because monitoring field is in high voltage, strong magnetic field circumstance is easily caused monitoring device to the electromagnetic interference that electronic equipment is produced and works abnormal, therefore, specially being taken measures from hardware and software, improves the antijamming capability of device.The overvoltage brought simultaneously in order to bear power system frequent operation is impacted; device have also been devised reliable surge protection circuit; measuring circuit is gathered to current signal; power circuit; the interfaces such as telecommunication circuit have carried out the design of excess voltage protection, effectively raise the protective capability of monitoring device antisurge.
9）Designed device is aesthetic in appearance, simple to operate, easy for installation, stable, is used suitable for in-site installation.
Brief description of the drawings：
Fig. 1 represents operation principle schematic diagram of the present utility model；
Fig. 2 is the structured flowchart of transformer iron core grounding current on-Line Monitor Device of the present utility model；
Fig. 3 is networking structure schematic diagram of the present utility model.
Fig. 4 is the internal structure schematic diagram of transformer iron core grounding current on-Line Monitor Device；
Fig. 5 is the external structure schematic diagram of transformer iron core grounding current on-Line Monitor Device；
Fig. 6 is the external perspective structural representation of transformer iron core grounding current on-Line Monitor Device.
Embodiment：The utility model is described further below in conjunction with the accompanying drawings：
As shown in Figure 1, for a kind of transformer iron core grounding current on-Line Monitor Device of the present utility model, the device includes controller, Real Time Clock System, voltage signal conditioning circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer；The straight-through current transformer is connected to current-to-voltage converting circuit, current-to-voltage converting circuit is connected to gear switch control circuit, gear switch control circuit is connected to voltage signal conditioning circuit, and voltage signal conditioning circuit and Real Time Clock System are connected to controller.
The device also includes display screen and FLASH memory；Display screen and FLASH memory are connected to controller.
Data communication system is also associated with controller.Controller, Real Time Clock System, voltage signal conditioning circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer are arranged in housing, and display screen is arranged on the top cover of housing.
This example is used as primary current harvester, model from straight-through current transformer：CT-X-3, secondary current collection is using three kinds of ranges：1:0-100mA, 2:100mA-1A, 3：1A-10A.When earth current is of different sizes, the electric current of different ranges is measured using range automatic switching circuit, so as to ensure the accuracy of data.
As shown in Figure 1：The utility model is when in use by the iron core grounding current lead-out wire of transformer body, the earth current lead-out wire is connected after passing through straight-through current transformer with transformer grounding end, that is straight-through current transformer is sleeved on into iron core grounding current signal of acquisition on transformer core grounding line；
As shown in Figure 2, transformer iron core grounding current signal is coupled to after secondary coil and is converted to secondary current signal by straight-through current transformer, and the secondary current signal is converted into voltage signal through current-to-voltage converting circuit, the voltage signal is after the enhanced processing of gear automatic switching control circuit, sent into after voltage signal conditioning circuit and calculating processing is carried out in the AD circuits that controller is carried, and be compared with alarm threshold value set in advance, if measurement result is abnormal, controller then control display screen display alarm signal, and result and the time at measurement moment after controller is calculated, the display screen that can be carried by device is shown, the time is provided by Real Time Clock System, the time at measurement result and measurement moment is stored in FLASH memory simultaneously, it is used as information back-up data, to provide foundation with post analysis iron core grounding current working condition.Furthermore it is also possible to which real time data or historical data are uploaded into monitoring computer or comprehensive monitoring unit by RS485 buses using data communication system（Main IED）, and computer or main IED can carry out various parameters configuration by communication protocol to monitoring device, to meet the demand of Different field.When the utility model detects transformer iron core grounding current beyond prescribed limit, whole transformer iron core grounding current on-Line Monitor Device and monitoring computer will send alarm signal, remind operations staff to take measures to be handled, prevent the generation of transformer fault.
The method of measuring transformer current effective value is as follows in the utility model：
As illustrated,
For iron core grounding primary current value, pass through 1000:Gained secondary current value is after the current transformer of 1 no-load voltage ratio
。
I.e.
After current-voltage conversion circuit,
After amplifying circuit, voltage is enlarged into
Wherein
（It is different according to range,And
Value will change therewith）
After a DC stacked circuit, the voltage for being input to AD mouthfuls is
When
When, i.e., when more than current range ability, processor will be adjusted
It is worth size, to meet
Condition.
Voltage fundamental virtual value into AD is tried to achieve by Fourier Transform Algorithm.
Voltage fundamental virtual value is obtained, is derived by multiple averaging processing and reversely, counted is transformer iron core grounding current virtual value.
Following set of data obtain data for laboratory measurement：
| Sampling time | Test current source（mA） | Measurement device result (mA) |
| 2010-12-20 9:05 | 8.0mA | 7.8mA |
| 2010-12-20 9:08 | 20.0mA | 19.7mA |
| 2010-12-20 9:11 | 50.0mA | 49.5mA |
| 2010-12-20 9:14 | 80.0mA | 80.1mA |
| 2010-12-20 9:17 | 110.0mA | 109.3mA |
| 2010-12-20 9:20 | 210.0mA | 210.2mA |
Iron core grounding current on-Line Monitor Device and method of the present utility model can monitor the real-time change situation of iron core grounding current data in real time, and with electric current overload alarm, data information memory, during system pair, a variety of functions such as parameter flexible configuration, both multipoint earthing of iron core of transformer potential faults can be found in time, can also reduce or even replace inspection of the operations staff to transformer iron core grounding current operation conditions to work.Therefore, on-line monitoring is carried out to transformer iron core grounding current to be very meaningful and is necessary that one, ground works.
The utility model is capable of the situation of change of the real-time monitoring transformer iron core grounding current of accurate stable, is transformer station high-voltage side bus condition evaluation foundation so as to monitor the state of transformer core grounding in running status.
The utility model can be widely used in the on-line monitoring of iron core/clamp earthing current of the electrical equipments such as transformer, reactor.
Claims (5)
1. transformer iron core grounding current on-Line Monitor Device, it is characterised in that：The device includes controller, Real Time Clock System, voltage signal conditioning circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer；The straight-through current transformer is connected to current-to-voltage converting circuit, current-to-voltage converting circuit is connected to gear switch control circuit, gear switch control circuit is connected to voltage signal conditioning circuit, and voltage signal conditioning circuit and Real Time Clock System are connected to controller.
2. transformer iron core grounding current on-Line Monitor Device according to claim 1, it is characterised in that：The device also includes display screen and FLASH memory；Display screen and FLASH memory are connected to controller.
3. transformer iron core grounding current on-Line Monitor Device according to claim 1 or 2, it is characterised in that：Data communication system is also associated with the controller.
4. transformer iron core grounding current on-Line Monitor Device according to claim 2, it is characterised in that：Controller, Real Time Clock System, voltage signal conditioning circuit, gear switch control circuit, current-to-voltage converting circuit and straight-through current transformer are arranged in housing, and display screen is arranged on the top cover of housing.
5. transformer iron core grounding current on-Line Monitor Device according to claim 1, it is characterised in that：The no-load voltage ratio of straight-through current transformer is 1000:1；It is 0-100mA, 100mA-1A and 1A-10A that gear switch, which controls the range of the switching of circuit,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120265765XU CN202217010U (en) | 2011-07-26 | 2011-07-26 | Online monitoring device of grounding current of transformer iron core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120265765XU CN202217010U (en) | 2011-07-26 | 2011-07-26 | Online monitoring device of grounding current of transformer iron core |
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| CN202217010U true CN202217010U (en) | 2012-05-09 |
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| CN201120265765XU Expired - Fee Related CN202217010U (en) | 2011-07-26 | 2011-07-26 | Online monitoring device of grounding current of transformer iron core |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411084A (en) * | 2011-07-26 | 2012-04-11 | 东北电力科学研究院有限公司 | Online monitoring device and method of grounding current of iron core of transformer |
| CN103163364A (en) * | 2013-03-21 | 2013-06-19 | 辽宁省电力有限公司电力科学研究院 | Wireless monitoring device and monitoring method for grounding current of transformer core/clamp |
| CN105699753A (en) * | 2016-03-29 | 2016-06-22 | 国网上海市电力公司 | Online monitoring device for grounding current of transformer core |
| CN105699836A (en) * | 2016-03-29 | 2016-06-22 | 国网上海市电力公司 | Method for detecting grounding current of transformer core |
-
2011
- 2011-07-26 CN CN201120265765XU patent/CN202217010U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411084A (en) * | 2011-07-26 | 2012-04-11 | 东北电力科学研究院有限公司 | Online monitoring device and method of grounding current of iron core of transformer |
| CN102411084B (en) * | 2011-07-26 | 2014-02-12 | 东北电力科学研究院有限公司 | Online monitoring device and method of grounding current of iron core of transformer |
| CN103163364A (en) * | 2013-03-21 | 2013-06-19 | 辽宁省电力有限公司电力科学研究院 | Wireless monitoring device and monitoring method for grounding current of transformer core/clamp |
| CN105699753A (en) * | 2016-03-29 | 2016-06-22 | 国网上海市电力公司 | Online monitoring device for grounding current of transformer core |
| CN105699836A (en) * | 2016-03-29 | 2016-06-22 | 国网上海市电力公司 | Method for detecting grounding current of transformer core |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: LIAONING DONGKE ELECTRIC POWER CO., LTD. LIAONING Free format text: FORMER OWNER: LIAONING DONGKE ELECTRIC POWER CO., LTD. Effective date: 20121024 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121024 Address after: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39 Patentee after: Northeast Electric Power Research Institute Co., Ltd. Patentee after: Liaoning Dongke Power Co., Ltd. Patentee after: Liaoning Electric Power Co., Ltd.Electric Power Science Research Institute Patentee after: State Grid Corporation of China Address before: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39 Patentee before: Northeast Electric Power Research Institute Co., Ltd. Patentee before: Liaoning Dongke Power Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120509 Termination date: 20200726 |