CN208013294U - A kind of transformer iron core grounding current on-Line Monitor Device - Google Patents
A kind of transformer iron core grounding current on-Line Monitor Device Download PDFInfo
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- CN208013294U CN208013294U CN201820464216.7U CN201820464216U CN208013294U CN 208013294 U CN208013294 U CN 208013294U CN 201820464216 U CN201820464216 U CN 201820464216U CN 208013294 U CN208013294 U CN 208013294U
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Abstract
A kind of transformer iron core grounding current on-Line Monitor Device, including current transformer, filter, range switch circuit, AD conversion module, microprocessor, LED digital displays, current-limiting circuit, buzzer siren, GPRS module and monitor terminal；The current transformer, filter, range switch circuit, AD conversion module, microprocessor, LED digital displays are sequentially connected in series；The current-limiting circuit control terminal, buzzer siren, GPRS module are connect with microprocessor respectively；The range switch circuit control terminal is connect with output end of microprocessor；The GPRS module is connect with wireless communication mode with monitor terminal.Present apparatus measuring range is adjustable, high certainty of measurement, and current-limiting resistance value can adjust on a large scale, safe；The present apparatus is easily installed, can remote monitoring, operation facility, save manpower；Transformer maintenance personnel can concentrate more transformers by the present apparatus and carry out remote monitoring, time saving and energy saving.
Description
Technical field
The utility model belongs to transformer grounding current monitoring field, and in particular to a kind of transformer iron core grounding current exists
Line monitoring device.
Background technology
Power transformer is the link that failure rate is multiple in one of equipment crucial in electric system and power equipment,
Its normal operation is power system security, stabilization, excellent, economical operation important guarantee.The iron core of transformer and reactor
And folder can form charge accumulated to form different suspended voltages, when suspended voltage reaches under the electric field action of winding
It will discharge when to a certain extent.In order to eliminate this phenomenon, iron core and the necessary reliable ground of folder, make it in transformer station high-voltage side bus
In remain earthing potential.When transformer normal operation, iron core grounding current is milliampere grade, when multipoint earthing event occurs for iron core
When barrier, iron core grounding current can will significantly increase that local iron core can be caused to overheat, and iron core hot-spot leads to the oil that insulate
Solution, it is also possible to make ground strip fuse or burn out iron core, lead to iron core electric potential floating, generate electric discharge, cause light gas action even
Grave gas action tripping, damages transformer, causes main transformer major accident.Therefore when power transformer normal operation, it is necessary to assure
Earth current is simultaneously maintained low numerical value by iron core reliable ground.
Be likely to cause significant damage since transformer iron core grounding current is excessive, can accurate recording and show
Monitoring system can be very good the understanding for assisting operation maintenance personnel to substation's iron core grounding situation, and take timely measure.Due to
The main website that present substation uses adds the one of unmanned station several patterns, personnel is dragged to be concentrated mainly on main website, it is desirable to understand nobody in time
The case where transformer iron core grounding current stood, needs designed device that can have the function of transmitting at a distance.In addition, existing
There is transformer grounding current sensing means range to fix, be unable to switching range, precision is low；Meanwhile existing transformer grounding electric current
Detection device current-limiting circuit can not achieve resistance value and control on a large scale.
Invention content
The purpose of this utility model is to solve the above problems, and provides a kind of transformer iron core grounding current on-line monitoring dress
Set, can remote monitoring, range is adjustable, and current-limiting resistance can adjust on a large scale, safe.
The technical solution of the utility model is a kind of transformer iron core grounding current on-Line Monitor Device, including Current Mutual Inductance
Device, filter, range switch circuit, AD conversion module, microprocessor, LED digital displays, current-limiting circuit, buzzer siren,
GPRS module and monitor terminal；The current transformer, filter, range switch circuit, AD conversion module, microprocessor, LED
Digital display is sequentially connected in series；The current-limiting circuit control terminal, buzzer siren, GPRS module connect with microprocessor respectively
It connects；The range switch circuit control terminal is connect with output end of microprocessor；The GPRS module is with wireless communication mode and prison
Control terminal connects.
Further, the range switch circuit includes operation transformer U1, potentiometer Rx, resistance R1 and resistance R2, fortune
The inverting input for calculating amplifier U1 is grounded through resistance R2, and the both ends potentiometer Rx are inputted with the positive of operational amplifier U1 respectively
The output end connection at end, operational amplifier U1；One end of resistance R1 is connect with the normal phase input end of operational amplifier U1, the other end
Input terminal as range switch circuit；Output end of the output end of operational amplifier U1 as range switch circuit.
Further, the current-limiting circuit includes potentiometer Ry, resistance R3, relay J1 and relay J2, resistance R3 with
After relay J2 parallel connections, then connect with potentiometer Ry；Relay J1 is connected in parallel on current-limiting circuit both ends；The control terminal of relay J1,
The control terminal of relay J2, the control terminal of potentiometer Ry are connect with the output end of microprocessor respectively.
Further, the potentiometer Rx is digital regulation resistance, and potentiometer Rx control terminals are connect with output end of microprocessor,
The resistance value of potentiometer Rx is controlled by microprocessor.
Further, the potentiometer Ry is digital regulation resistance, and potentiometer Ry control terminals are connect with output end of microprocessor,
The resistance value of potentiometer Ry is controlled by microprocessor.
Further, the monitor terminal is industrial control tablet computer or mobile phone or computer.
The utility model has the beneficial effects that present apparatus measuring range is adjustable, high certainty of measurement, cut-off current can be a wide range of
Adjustment, it is safe；The present apparatus is easily installed, can remote monitoring, operation facility, save manpower；Transformer maintenance personnel Ke Tong
It crosses the present apparatus and progress remote monitoring is concentrated to more transformers, it is time saving and energy saving.
Description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is the structure diagram of the utility model.
Fig. 2 is the utility model range switch circuit structure chart.
Fig. 3 is the utility model current-limiting circuit structure chart.
Specific implementation mode
As shown in Figs. 1-3, a kind of transformer iron core grounding current on-Line Monitor Device, including current transformer, filter,
Range switch circuit, AD conversion module, microprocessor, LED digital displays, current-limiting circuit, buzzer siren, GPRS module and
Monitor terminal；Current transformer, filter, range switch circuit, AD conversion module, microprocessor, LED digital displays are successively
It is connected in series with；Current-limiting circuit control terminal, buzzer siren, GPRS module are connect with microprocessor respectively；Range switch circuit control
End processed is connect with output end of microprocessor；GPRS module is connect with wireless communication mode with monitor terminal.The monitor terminal used
For industrial control tablet computer.
Range switch circuit includes operation transformer U1, potentiometer Rx, resistance R1 and resistance R2, and operational amplifier U1's is anti-
Phase input terminal through resistance R2 be grounded, the both ends potentiometer Rx respectively with the normal phase input end of operational amplifier U1, operational amplifier U1
Output end connection；One end of resistance R1 is connect with the normal phase input end of operational amplifier U1, and the other end switches electricity as range
The input terminal on road；Output end of the output end of operational amplifier U1 as range switch circuit.The operational amplifier U1's used
Model OPA4227.
Current-limiting circuit includes potentiometer Ry, resistance R3, relay J1 and relay J2, and resistance R3 is in parallel with relay J2
Afterwards, then with potentiometer Ry it connects；Relay J1 is connected in parallel on current-limiting circuit both ends.Current-limiting circuit both ends respectively with transformer grounding
End, ground wire connection.
The current transformer used is straight-through current transformer, and power current measurement range is 5mA~10A.
The filter used uses II type lowpass digital filter of Chebyshev, it is dull in passband, and in stopband
It is inside equal ripples, phase response is more linear than Chebyshev's I type lowpass digital filters.
The potentiometer Rx used is digital regulation resistance, and potentiometer Rx control terminals are connect with output end of microprocessor, potentiometer
The resistance value of Rx is controlled by microprocessor.The potentiometer Ry used is digital regulation resistance, potentiometer Ry control terminals and microprocessor
Output end connects, and the resistance value of potentiometer Ry is controlled by microprocessor.Point of the resistance value of potentiometer Rx models X9241, X9241
Grade variation is controlled by microcontroller, and the amplification factor for changing current signal in a program thus may be implemented, and realizes program-controlled put
Greatly.
AD conversion module uses ADS1120 chips, it be a kind of high speed, low-power consumption, low noise, 16 of precision be used for
The AD converter of small signal transducer.Conversion not only can be executed with 2000 times/S sampling data rates, but also within the monocycle
Relatively stablize.
The microprocessor used uses STC89C58 microcontrollers, is 8 a kind of low-power consumption, high performance CMOS microcontrollers
Device has 32K in-system programmable components flash storages.
The GPRS module used uses GTM900C modules, and GTM900C is that 900/1800 MHz of a double frequency is highly integrated
GSM/GPRS modules embed ICP/IP protocol module, using simple, are easily integrated, while cheap.
Device using the above structure, in use, transformer iron core grounding current is by current transformer isolated variable
Small signal, filtered device and range switch circuit processing, are filtered and amplify, be then transformed to number by AD conversion module
Signal, microprocessor obtain iron core grounding current by digital filtering and operation.Microprocessor to range switch circuit range into
Row control, makes the input signal of AD conversion module be in zone of reasonableness.LED digital displays show measurement result.The iron measured
Core earth current is sent to monitor terminal by GPRS module through GPRS network, and long-range prison in real time is carried out for transformer operation maintenance personnel
It surveys, and can long-range switching range.
When iron core grounding current is more than setting value, buzzer warning, warning message is transmitted to monitor terminal, prompts O&M
Personnel pay attention to.Meanwhile the present apparatus has current-limiting circuit, when electric current is more than setting limit value, microprocessor controlling potential device Ry increases
Resistance value, to reduce earth current as emergency measure, operation maintenance personnel also can be remotely to relay J1, relay J2, potentiometer
Ry resistance values are controlled.
Claims (6)
1. a kind of transformer iron core grounding current on-Line Monitor Device, including it is current transformer, filter, AD conversion module, micro-
Processor, LED digital displays, current-limiting circuit, which is characterized in that further include range switch circuit, GPRS module, buzzing alarm
Device and monitor terminal；The current transformer, filter, range switch circuit, AD conversion module, microprocessor, LED numbers are aobvious
Show that device is sequentially connected in series；The current-limiting circuit control terminal, buzzer siren, GPRS module are connect with microprocessor respectively；Institute
Range switch circuit control terminal is stated to connect with output end of microprocessor；The GPRS module is with wireless communication mode and monitor terminal
Connection.
2. transformer iron core grounding current on-Line Monitor Device according to claim 1, which is characterized in that the range is cut
It includes operation transformer U1, potentiometer Rx, resistance R1 and resistance R2 to change circuit, and the inverting input of operational amplifier U1 is through resistance
R2 is grounded, and the both ends potentiometer Rx are connect with the output end of the normal phase input end of operational amplifier U1, operational amplifier U1 respectively；Electricity
One end of resistance R1 is connect with the normal phase input end of operational amplifier U1, input terminal of the other end as range switch circuit；Operation
Output end of the output end of amplifier U1 as range switch circuit.
3. transformer iron core grounding current on-Line Monitor Device according to claim 1 or 2, which is characterized in that the limit
Current circuit includes potentiometer Ry, resistance R3, relay J1 and relay J2, after resistance R3 is in parallel with relay J2, then with current potential
Device Ry series connection；Relay J1 is connected in parallel on current-limiting circuit both ends；The control terminal of relay J1, the control terminal of relay J2, potentiometer
The control terminal of Ry is connect with the output end of microprocessor respectively.
4. transformer iron core grounding current on-Line Monitor Device according to claim 2, which is characterized in that the potentiometer
Rx is digital regulation resistance, and potentiometer Rx control terminals are connect with output end of microprocessor, and the resistance value of potentiometer Rx is by microprocessor
Control.
5. transformer iron core grounding current on-Line Monitor Device according to claim 3, which is characterized in that the potentiometer
Ry is digital regulation resistance, and potentiometer Ry control terminals are connect with output end of microprocessor, and the resistance value of potentiometer Ry is by microprocessor
Control.
6. transformer iron core grounding current on-Line Monitor Device according to claim 1 or 2, which is characterized in that the prison
Control terminal is industrial control tablet computer or mobile phone or computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820464216.7U CN208013294U (en) | 2018-04-03 | 2018-04-03 | A kind of transformer iron core grounding current on-Line Monitor Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820464216.7U CN208013294U (en) | 2018-04-03 | 2018-04-03 | A kind of transformer iron core grounding current on-Line Monitor Device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208013294U true CN208013294U (en) | 2018-10-26 |
Family
ID=63891758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820464216.7U Expired - Fee Related CN208013294U (en) | 2018-04-03 | 2018-04-03 | A kind of transformer iron core grounding current on-Line Monitor Device |
Country Status (1)
| Country | Link |
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| CN (1) | CN208013294U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441577A (en) * | 2019-08-16 | 2019-11-12 | 大连世有电力科技有限公司 | A kind of highly integrated transformer iron core grounding current intelligent online monitoring device |
| CN110601361A (en) * | 2019-09-11 | 2019-12-20 | 广东电网有限责任公司 | Grounding current on-line monitoring terminal |
| CN110649586A (en) * | 2019-09-27 | 2020-01-03 | 上海锐开电气有限公司 | Iron core grounding current over-current suppression resistance circuit |
| WO2020155314A1 (en) * | 2019-02-01 | 2020-08-06 | 深圳市金准生物医学工程有限公司 | Optical sampling module having balanced sampling width and precision, and immunofluorescence assay equipment |
-
2018
- 2018-04-03 CN CN201820464216.7U patent/CN208013294U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020155314A1 (en) * | 2019-02-01 | 2020-08-06 | 深圳市金准生物医学工程有限公司 | Optical sampling module having balanced sampling width and precision, and immunofluorescence assay equipment |
| CN110441577A (en) * | 2019-08-16 | 2019-11-12 | 大连世有电力科技有限公司 | A kind of highly integrated transformer iron core grounding current intelligent online monitoring device |
| CN110601361A (en) * | 2019-09-11 | 2019-12-20 | 广东电网有限责任公司 | Grounding current on-line monitoring terminal |
| CN110649586A (en) * | 2019-09-27 | 2020-01-03 | 上海锐开电气有限公司 | Iron core grounding current over-current suppression resistance circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181026 Termination date: 20190403 |
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| CF01 | Termination of patent right due to non-payment of annual fee |