CN105092981A - Grounding resistor on-line monitor - Google Patents
Grounding resistor on-line monitor Download PDFInfo
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- CN105092981A CN105092981A CN201410213811.XA CN201410213811A CN105092981A CN 105092981 A CN105092981 A CN 105092981A CN 201410213811 A CN201410213811 A CN 201410213811A CN 105092981 A CN105092981 A CN 105092981A
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Abstract
The invention provides a grounding resistor on-line monitor comprising a lithium battery, a solar cell panel, a power supply management circuit, an abnormity processing circuit, a low-power consumption management circuit, a button input circuit, a liquid crystal display circuit, an acousto-optic alarm circuit, a real time clock circuit, a core processing circuit, an excitation signal circuit, a first current transformer, a grounding resistor loop, a second current transformer, a signal processing circuit, a signal sampling circuit, a level converting circuit, a short message management circuit and an RS458 communication circuit. According to the grounding resistor on-line monitor of the invention, a new grounding resistor measuring method is provided; the operationality is strong; the construction amount is small; the precision is relatively high; continuous measuring of a grounding resistor is realized; a whole life cycle of a grounding device can be monitored; remote on-line monitoring is realized; and the grounding resistor on-line monitor is especially applicable to state monitoring of grounding resistors of unmanned grounding devices and grounding devices in severe environments.
Description
Technical field
The present invention relates to a kind of stake resistance on-Line Monitor Device, this device have employed a kind of method of brand-new measurement of Grounding Resistance, and realizes the function of remote online monitoring by the multiple communication modes such as wired, wireless.
Background technology
According to DL/T621 " ground connection of alternating-current electric device " requirement, in electric system, some conductive part of electric device, facility answers ground connection.Ground connection, namely electrical equipment the part of ground connection must do good connection with ground.Ground connection comprises working earthing, protective ground, lightning protected ground connection and anti static grounding, and earthing device is directly connected to device security, personal safety and security of system.The resistance of what so-called stake resistance referred to is exactly earthing device.The change of stake resistance directly has influence on the earthing effect of electrical equipment.
The practical approach of current measurement of Grounding Resistance has megohmmeter measuring method and power current voltage method.Adopt megohmmeter measuring method to need the contact conductor arranging more than tens meters at the scene, workload is very large; And adopt power current voltage method, require that pressure-wire and current line should as far as possible away from, otherwise the mutual inductance electromotive forces containing very large composition in the magnitude of voltage measured, to such an extent as to the result measured deviates from truth completely.
Due to antecedent soil moisture or the impact seasonal variations such as freezing, stake resistance may all change in the four seasons.Current earthing device all requires to carry out regular inspection and maintenance, generally every half a year to one year repetition measurement once.There is certain drawback in this method, one is need special messenger's regular visit, and cost is higher; Two is that unmanned ground region measurement difficulty is large; Three is because repetition measurement interval time is longer, once erroneous judgement may bring more serious consequence.
Summary of the invention
Technical matters to be solved by this invention is the grounding resistance measurement scheme proposing a kind of workable, with low cost, on-line real time monitoring.
For solving the problems of the technologies described above, the invention provides a kind of stake resistance on-line computing model, comprise lithium battery, solar panel, electric power management circuit, exception handling circuit, low-power consumption management circuit, button inputting circuits, liquid crystal display circuit, sound light alarming circuit, real time clock circuit, core processing circuit, pumping signal circuit, first group of current transformer, stake resistance loop, second group of current transformer, signal processing circuit, signal sample circuit, level shifting circuit, short message managing circuit, RS485 communicating circuit.
First group of current transformer, second group of current transformer are the current transformer that two groups of structures are identical, and this current transformer protects inner casing (its outside surface of copper conductor coiling) by metal shell, plastics, permalloy magnetic core forms.
Pumping signal circuit, comprises high frequency signal generator, signal follow circuit and power amplification circuit.
Signal processing circuit, comprises signal one-level amplifying circuit, active filter circuit, signal second amplifying circuit, signal madulation and filtering circuit and precision rectifying filtering circuit.
Core processing circuit is connected with pumping signal circuit by analog to digital conversion interface, pumping signal circuit produces specific voltage signal and outputs to first group of current transformer, testing resistance loop punching is by first group of current transformer and second group of current transformer, second group of current transformer inductive coupling is to voltage signal and output to signal processing circuit, after signal processing circuit filter and amplification, output to signal sample circuit, signal sample circuit is connected with core processing circuit by digital-to-analog conversion interface.Core processing circuit calculates the numerical value of stake resistance according to the output of this group and input signal.
Core processing circuit is connected with short message managing circuit by level shifting circuit, and short message managing circuit transmitting-receiving note, realizes the on-line monitoring of wireless mode; Short message managing circuit can fixed-time short message sending, and short message content comprises grounding resistance and alarm condition; Short message managing circuit can receive short message, and initiate a brand-new grounding resistance and measure, and postback short message, short message content comprises current grounding resistance and alarm condition.
Core processing circuit is connected with RS485 communicating circuit, realizes the on-line monitoring of wired mode.
Lithium battery, solar panel are connected with electric power management circuit, and electric power management circuit is responsible for solar panel to the management of lithium cell charging, and electric power management circuit is responsible for the power supply management to core processing unit and other peripheral hardwares.
Exception handling circuit is connected with the reset circuit of core processing circuit, is responsible for the operation exception situation of monitoring core treatment circuit.
Low-power consumption management circuit is connected with the electric power loop of core processing circuit, is responsible for the operation power consumption situation of monitoring core treatment circuit, cuts off relevant portion circuit at the appropriate time to realize low power operation.
Button inputting circuits is connected with the GPIO mouth of core processing circuit, is convenient to arrange warning critical value.
Liquid crystal display circuit is connected with the SPI mouth of core processing circuit, the display of relevant information when being convenient to show grounding resistance measurement value and setting operation.
Sound light alarming circuit is connected with the GPI0 mouth of core processing circuit, and when grounding resistance measurement value is higher than warning critical value, sound light alarming circuit is reported to the police by luminous and sounding two kinds of modes.
Real time clock circuit is connected with core processing circuit, for recording each correct time measured.Real time clock circuit carries button cell, when lithium battery power shortage, still can ensure the normal operation of real time clock circuit within a certain period of time.
The present invention has positive effect: (1) stake resistance of the present invention on-line computing model provides a kind of new ground resistance measurement method, and workable, construction volume is little, and precision is higher; (2) stake resistance on-line computing model of the present invention can be grounded the continuous coverage of resistance, can monitor the life cycle management of earthing device; (3) stake resistance on-line computing model of the present invention achieves stake resistance brake far away, is particularly useful for the status monitoring of the regional grounding resistance of transmission of unmanned and bad environments.
Accompanying drawing explanation
Fig. 1 is the stake resistance on-line computing model fundamental diagram of embodiment.
Fig. 2 is the current transformer structure figure of the stake resistance on-line computing model of embodiment.
Fig. 3 is the pumping signal schematic block circuit diagram of the stake resistance on-line computing model of embodiment.
Fig. 4 is the signal processing circuit theory diagram of the stake resistance on-line computing model of embodiment.
Embodiment
As shown in Figure 1, the stake resistance on-line computing model of the present embodiment, comprises lithium battery 1, solar panel 2, electric power management circuit 3, exception handling circuit 4, low-power consumption management circuit 5, button inputting circuits 6, liquid crystal display circuit 7, sound light alarming circuit 8, real time clock circuit 9, core processing circuit 10, pumping signal circuit 11, first group of current transformer 12,13, second group, stake resistance loop current transformer 14, signal processing circuit 15, signal sample circuit 16, level shifting circuit 17, short message managing circuit 18, RS485 communicating circuit 19; Lithium battery 1 is connected with the input end of electric power management circuit 3 with the output terminal of solar panel 2; The output terminal of electric power management circuit 3 is connected with the power end of core processing circuit 10; The output terminal of exception handling circuit 4 is connected with the resetting pin of core processing circuit 10; The output terminal of low-power consumption management 5 is connected with the electric power loop of core processing circuit 10; Button inputting circuits 6 is connected with the GPIO mouth of core processing circuit 10; Liquid crystal display circuit 7 is connected with the SPI mouth of core processing circuit 10; Sound light alarming circuit 8 is connected with the GPIO mouth of core processing circuit 10; Real time clock circuit 9 is connected with core processing circuit 10; The output terminal of core processing circuit 10 is connected with pumping signal circuit 11 input end; Pumping signal circuit 11 output terminal is connected with the input end of first group of current transformer 12; Stake resistance loop 13 punching is by first via current transformer 12 and No. second current transformer 14; The output terminal of No. second current transformer 14 is connected with the input end of signal processing circuit 15; The output terminal of signal processing circuit 15 is connected with the input end of signal sample circuit 16; The output terminal of signal sample circuit 16 is connected with the input end of core processing circuit 10; The serial ports of core processing circuit 10 exports and is connected with the input end of level shifting circuit 17; The output terminal of level shifting circuit 17 is connected with the input end of short message managing circuit 18; The serial ports of core processing circuit 10 exports and is connected with the input end of RS485 communicating circuit 19.
As shown in Figure 2, the current transformer 12/14 of the stake resistance on-line computing model of the present embodiment, comprises metal shell 21/25, plastics protection inner casing (its outside surface of copper conductor coiling) 22/24, permalloy magnetic core 23; Permalloy magnetic core 23 is included among plastics protection inner casing (its outside surface of copper conductor coiling) 22/24, and outermost layer is metal shell 21/25.
As shown in Figure 3, the pumping signal circuit 11 of the stake resistance on-line computing model of the present embodiment, comprises high frequency signal generator 26, signal follow circuit 27 and power amplification circuit 28; The output terminal of high frequency signal generator 26 is connected with the input end of signal follow circuit 27, and the output terminal of signal follow circuit 27 is connected with the input end of power amplification circuit 28.
As shown in Figure 4, the signal processing circuit 15 of the stake resistance on-line computing model of the present embodiment, comprises signal one-level amplifying circuit 29, active filter circuit 30, signal second amplifying circuit 31, signal madulation and filtering circuit 32 and precision rectifying filtering circuit 33; The output terminal of signal one-level amplifying circuit 29 is connected with the input end of active filter circuit 30, the output terminal of active filter circuit 30 is connected with the input end of signal second amplifying circuit 31, the output terminal of signal second amplifying circuit 31 is connected with the input end of signal madulation and filtering circuit 32, and the output terminal of signal madulation and filtering circuit 32 is connected with the input end of precision rectifying filtering circuit 33.
Claims (8)
1. stake resistance on-line computing model, it is characterized in that, comprise lithium battery (1), solar panel (2), electric power management circuit (3), exception handling circuit (4), low-power consumption management circuit (5), button inputting circuits (6), liquid crystal display circuit (7), sound light alarming circuit (8), real time clock circuit (9), core processing circuit (10), pumping signal circuit (11), first group of current transformer (12), stake resistance loop (13), second group of current transformer (14), signal processing circuit (15), signal sample circuit (16), level shifting circuit (17), short message managing circuit (18), RS485 communicating circuit (19), lithium battery (1) is connected with electric power management circuit (3) input end with solar panel (2) output terminal, electric power management circuit (3) output terminal is connected with core processing circuit (10) power end, exception handling circuit (4) output terminal is connected with core processing circuit (10) resetting pin, the output terminal of low-power consumption management (5) is connected with core processing circuit (10) electric power loop, button inputting circuits (6) is connected with core processing circuit (10) GPIO mouth, liquid crystal display circuit (7) is connected with core processing circuit (10) SPI mouth, sound light alarming circuit (8) is connected with core processing circuit (10) GPIO mouth, real time clock circuit (9) is connected with core processing circuit (10), core processing circuit (10) output terminal is connected with pumping signal circuit (11) input end, pumping signal circuit (11) output terminal is connected with first group of current transformer (12) input end, stake resistance loop (13) punching is by first via current transformer (12) and No. second current transformer (14), No. second current transformer (14) output terminal is connected with signal processing circuit (15) input end, signal processing circuit (15) output terminal is connected with signal sample circuit (16) input end, signal sample circuit (16) output terminal is connected with core processing circuit (10) input end, core processing circuit (10) serial ports exports and is connected with level shifting circuit (17) input end, level shifting circuit (17) output terminal is connected with short message managing circuit (18) input end, core processing circuit (10) serial ports exports and is connected with RS485 communicating circuit (19) input end.
2. stake resistance on-line computing model as claimed in claim 1, it is characterized in that, core processing circuit (10) is STM32F103RCT6 chip.
3. stake resistance on-line computing model as claimed in claim 1; it is characterized in that; first group of current transformer (12) and second group of current transformer (14), for adopting high magnetic permeability permalloy to be the current transformer of magnetic core, comprise metal shell (21)/(25), plastics protection inner casing (its outside surface of copper conductor coiling) (22)/(24), permalloy magnetic core (23).
4. stake resistance on-line computing model as claimed in claim 1, is characterized in that, pumping signal circuit (11) is high frequency signal generator (26), signal follow circuit (27) and power amplification circuit (28).
5. stake resistance on-line computing model as claimed in claim 1, it is characterized in that, signal processing circuit (15) is signal one-level amplifying circuit (29), active filter circuit (30), signal second amplifying circuit (31), signal madulation and filtering circuit (32) and precision rectifying filtering circuit (33).
6. stake resistance on-line computing model as claimed in claim 1, it is characterized in that, level shifting circuit (17) is Transistor-Transistor Logic level RS 232 level circuit.
7. stake resistance on-line computing model as claimed in claim 1, it is characterized in that, the measuring method of stake resistance, for testing resistance loop (13) punching is by first group of current transformer (12) and second group of current transformer (14), core processing circuit (10) output signal produces specific high-frequency signal to pumping signal circuit (11), high-frequency signal is by first group of current transformer (12), stake resistance loop (13) and second group of current transformer (14), process through signal processing circuit (15) again, finally sampled by signal sample circuit (16) and be input to core processing circuit (10).Core processing circuit (10) calculates the numerical value of stake resistance according to the output of this group and input signal.
8. stake resistance on-line computing model as claimed in claim 1, it is characterized in that, on-line monitoring function comprises wireless communication mode and wire communication mode, is made up of core processing circuit (10), level shifting circuit (17), short message managing circuit (18) and RS485 communicating circuit (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410213811.XA CN105092981A (en) | 2014-05-15 | 2014-05-15 | Grounding resistor on-line monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410213811.XA CN105092981A (en) | 2014-05-15 | 2014-05-15 | Grounding resistor on-line monitor |
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| CN105092981A true CN105092981A (en) | 2015-11-25 |
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| CN201410213811.XA Pending CN105092981A (en) | 2014-05-15 | 2014-05-15 | Grounding resistor on-line monitor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390167A (en) * | 2018-05-04 | 2018-08-10 | 山东交通学院 | Electric Appliance Cabinet earthing or grounding means with real-time detection ground state and warning function |
| CN109917190A (en) * | 2018-12-29 | 2019-06-21 | 天津高德朗益科技有限公司 | A kind of intelligent monitor system based on insulating resistance measuring |
| CN109917189A (en) * | 2018-12-29 | 2019-06-21 | 天津高德朗益科技有限公司 | A kind of intelligent detecting instrument with explosion prevention function |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61251776A (en) * | 1985-04-30 | 1986-11-08 | Nf Kairo Sekkei Block:Kk | Measuring instrument for earth resistance |
| JPH06213946A (en) * | 1993-01-20 | 1994-08-05 | Chubu Electric Power Co Inc | Device and method for measuring grounding resistance of distribution line |
| JP2654549B2 (en) * | 1987-11-30 | 1997-09-17 | 東洋通信機株式会社 | Simple insulation resistance measurement method |
| CN2616913Y (en) * | 2002-05-28 | 2004-05-19 | 西安佳源技术贸易发展有限责任公司 | Power frequency mutual inductance type ground resistance measuring instrument |
| CN1163758C (en) * | 2000-02-29 | 2004-08-25 | 万用计测器株式会社 | Method for testing earthing resistance |
| CN201344954Y (en) * | 2009-01-06 | 2009-11-11 | 西安雷迪维护系统设备有限公司 | Special digital earth resistance online measuring device of electrified railway system |
| CN201569705U (en) * | 2009-11-06 | 2010-09-01 | 国电龙源电气有限公司 | Monitoring device for ground wire resistance and current of distribution transformer |
| CN102128984A (en) * | 2010-12-06 | 2011-07-20 | 河南省电力公司南阳供电公司 | Comprehensive tester of programmable power supply insulation resistance and earthed resistance |
| CN103941097A (en) * | 2014-04-30 | 2014-07-23 | 国家电网公司 | Large ground grid grounding resistance real-time monitor |
| CN203941236U (en) * | 2014-05-15 | 2014-11-12 | 常州帕斯菲克自动化技术股份有限公司 | Stake resistance on-line monitoring instrument |
-
2014
- 2014-05-15 CN CN201410213811.XA patent/CN105092981A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61251776A (en) * | 1985-04-30 | 1986-11-08 | Nf Kairo Sekkei Block:Kk | Measuring instrument for earth resistance |
| JP2654549B2 (en) * | 1987-11-30 | 1997-09-17 | 東洋通信機株式会社 | Simple insulation resistance measurement method |
| JPH06213946A (en) * | 1993-01-20 | 1994-08-05 | Chubu Electric Power Co Inc | Device and method for measuring grounding resistance of distribution line |
| CN1163758C (en) * | 2000-02-29 | 2004-08-25 | 万用计测器株式会社 | Method for testing earthing resistance |
| CN2616913Y (en) * | 2002-05-28 | 2004-05-19 | 西安佳源技术贸易发展有限责任公司 | Power frequency mutual inductance type ground resistance measuring instrument |
| CN201344954Y (en) * | 2009-01-06 | 2009-11-11 | 西安雷迪维护系统设备有限公司 | Special digital earth resistance online measuring device of electrified railway system |
| CN201569705U (en) * | 2009-11-06 | 2010-09-01 | 国电龙源电气有限公司 | Monitoring device for ground wire resistance and current of distribution transformer |
| CN102128984A (en) * | 2010-12-06 | 2011-07-20 | 河南省电力公司南阳供电公司 | Comprehensive tester of programmable power supply insulation resistance and earthed resistance |
| CN103941097A (en) * | 2014-04-30 | 2014-07-23 | 国家电网公司 | Large ground grid grounding resistance real-time monitor |
| CN203941236U (en) * | 2014-05-15 | 2014-11-12 | 常州帕斯菲克自动化技术股份有限公司 | Stake resistance on-line monitoring instrument |
Non-Patent Citations (2)
| Title |
|---|
| 刘洪正等: "远程监控接地电阻测试仪", 《石油化工自动化》 * |
| 曹青松等: "基于C8051F005 新型接地电阻检测仪的研制", 《电测与仪表》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390167A (en) * | 2018-05-04 | 2018-08-10 | 山东交通学院 | Electric Appliance Cabinet earthing or grounding means with real-time detection ground state and warning function |
| CN108390167B (en) * | 2018-05-04 | 2023-12-12 | 山东交通学院 | Electrical cabinet grounding device with real-time grounding state detection and alarm functions |
| CN109917190A (en) * | 2018-12-29 | 2019-06-21 | 天津高德朗益科技有限公司 | A kind of intelligent monitor system based on insulating resistance measuring |
| CN109917189A (en) * | 2018-12-29 | 2019-06-21 | 天津高德朗益科技有限公司 | A kind of intelligent detecting instrument with explosion prevention function |
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Application publication date: 20151125 |