CN107192887A - A kind of digital grounding resistance test system - Google Patents
A kind of digital grounding resistance test system Download PDFInfo
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- CN107192887A CN107192887A CN201710620752.1A CN201710620752A CN107192887A CN 107192887 A CN107192887 A CN 107192887A CN 201710620752 A CN201710620752 A CN 201710620752A CN 107192887 A CN107192887 A CN 107192887A
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- module
- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a kind of digital grounding resistance test system, including digital earth resistance tester, standard resistance box, measuring resistance and universal meter；Described digital earth resistance tester mainly includes main control module, circuit protection module, balanced type input amplifying circuit, PWM controls constant-current source, buffer amplifier, filter unit, sampling module, A/D modular converters and power module；Described main control module mainly includes data acquisition module, Data Analysis Services module, digital filtering module, memory module, keyboard and display；Described filter unit mainly includes RC filter circuits, phase-locked loop circuit, counter, bilateral analog switch, resistor and capacitor.Compared with prior art, the present invention has that error is small, detection is accurate, detection range is wide, strong antijamming capability the features such as.
Description
Technical field
The present invention relates to a kind of earth resistance system, more particularly to a kind of digital grounding resistance test system.
Background technology
With the raising of quality of life, the setting of a large amount of building, the installation of various outdoor equipments seems safely more and more heavier
Want, especially the safety of lightning protection.With Chinese society expanding economy and the raising of modernization level, especially because letter
The fast development of breath technology, the extent of injury of Lightning Disaster and the economic loss caused and social influence are increasing.In order to anti-
Imperial and mitigation Lightning Disaster, protection national wealth and people life property safety, in order to prevent lightning disturbance, according to the rules, prevent
Thunder detection is that the lightning protection device after mandatory execution is come into operation carries out periodic detection system.Lightning protection detection is mandatory execution
, lightning protection device should be detected once every year, and the lightning protection device of blast and fire hazard place should be detected every half a year
Once.Lightning protection detection mainly includes the detection of lightning protection device working condition and insulating resistance measuring.
In recent years, shocking preventing technology had become the important skill of the engineering constructions such as power engineering construction, architectural engineering construction
One of art, lightning protection detection needs to set up the feasible systematic detecting system of a set of operation, promotes meteorological cause preferably to service
In the coordinated development of current social.China is that thunder activities are very frequently national.Because lightning impulse frequently results in personnel's wound
Die, building, power supply-distribution system, communication equipment are damaged, and cause forest fire, cause computer information system to interrupt, store in a warehouse, refine
The burning such as oily factory, oil field is even exploded, harm people's property and personal safety.
A kind of on-line measurement device of electric railway system, the dress as disclosed in Patent No. CN200920031616.X
Main alien frequencies power supply, electric current and the tension measuring circuit and micro computer TT＆C system for testing electric current by providing is put to constitute.The dress
Put using alien frequencies Anti-Jamming Technique, can be accurate under strong interference environment and convenient real-time online measures grounding resistance, and have
The characteristics of test result is reliable and stable and time saving and energy saving.The device is smaller due to test electric current, ground connection dress when will not cause test
The current potential put is too high, while it also has extremely strong antijamming capability, therefore on-line measurement can be carried out in the case where not having a power failure.
And for example a kind of digital online resistance measuring instrument disclosed in Patent No. CN93202391.6, mainly includes：Two-wire
Make online Ω/V converted measurements circuit, reference voltage, A/D change-over circuits, clock, automatic range control circuit, data display electricity
Road, constant pressure source, unit indicating circuit etc. are constituted.On-line measurement resistance value can be realized, measurement test pencil is double wire system, is effectively reduced
The influence of test pencil lead resistance, and measurement error is small, energy auto-shifted measurement, with numerical monitor, measurement is convenient, it is easy to carry,
To realizing that the real-time online measuring of dynamic electric resistor and resistance type sensor has larger meaning.
The content of the invention
It is an object of the invention to the deficiency for existing design, there is provided a kind of digital grounding resistance test system.
The technical scheme is that：
A kind of digital grounding resistance test system, including digital earth resistance tester, standard resistance box, measuring resistance
And universal meter；After described measuring resistance and universal meter are in parallel, then current terminal and voltage with digital earth resistance tester
End connection；Wherein one end of described standard resistance box is connected with the ground connection terminal circuit of digital earth resistance tester, another
End is connected between measuring resistance and universal meter, and forms loop with the voltage end of digital earth resistance tester；Described
Digital earth resistance tester mainly includes main control module, circuit protection module, balanced type input amplifying circuit, PWM controls
Constant-current source, buffer amplifier, filter unit, sampling module, A/D modular converters and power module；Described power module, PWM
Control constant-current source, circuit protection module, main control module, A/D modular converters, buffer amplifier, filter unit, balanced type input are put
Big circuit, sampling module are sequentially connected in series.
Described main control module mainly includes data acquisition module, Data Analysis Services module, digital filtering module, storage
Module, keyboard and display.
Described filter unit mainly includes RC filter circuits, phase-locked loop circuit, counter, bilateral analog switch, resistance
Device and capacitor.
As further illustrating for the present invention, the gear of described universal meter include resistance grade, resistivity shelves, current gear and
Voltage gear.
As further illustrating for the present invention, the Standard resistance range of described standard resistance box is 0.01-9999 ohm.
As further illustrating for the present invention, the resistance of described measuring resistance is 1 ohm, 10 ohm, 100 ohm, 500
Ohm.
As further illustrating for the present invention, described power module is the combination of battery and solar cell.
Compared with prior art, the beneficial effect that the present invention possesses：
1st, compared with prior art, the present invention has that error is small, detection is accurate, and detection range is wide, strong antijamming capability etc.
Feature.
2nd, the present invention uses Phase Locked Loop Synchronization tracking technique so that other interfering frequency signals can not be scurried into, and weaken other
The interference of ripple.
3rd, the present invention uses digital filtering module, can be achieved to carry out at analysis detected signal in a period of time
Reason, thus cuts down the interference of outside twinkling signal significantly.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Fig. 2 is the connection diagram of digital earth resistance tester modules.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples, but protection scope of the present invention be not limited to
Lower embodiment.
Embodiment 1：
A kind of digital grounding resistance test system, including digital earth resistance tester, standard resistance box, measuring resistance
And universal meter；After described measuring resistance and universal meter are in parallel, then current terminal and voltage with digital earth resistance tester
End connection；Wherein one end of described standard resistance box is connected with the ground connection terminal circuit of digital earth resistance tester, another
End is connected between measuring resistance and universal meter, and forms loop with the voltage end of digital earth resistance tester；Described
Digital earth resistance tester mainly includes main control module, circuit protection module, balanced type input amplifying circuit, PWM controls
Constant-current source, buffer amplifier, filter unit, sampling module, A/D modular converters and power module；Described power module, PWM
Control constant-current source, circuit protection module, main control module, A/D modular converters, buffer amplifier, filter unit, balanced type input are put
Big circuit, sampling module are sequentially connected in series.
Described main control module mainly includes data acquisition module, Data Analysis Services module, digital filtering module, storage
Module, keyboard and display.
Described filter unit mainly includes RC filter circuits, phase-locked loop circuit, counter, bilateral analog switch, resistance
Device and capacitor.
The gear of described universal meter includes resistance grade, resistivity shelves, current gear and voltage gear.
The Standard resistance range of described standard resistance box is 0.01-9999 ohm.
The resistance of described measuring resistance is 1 ohm, 10 ohm, 100 ohm, 500 ohm.
Described power module is the combination of battery and solar cell.
During detection, set the resistance of measuring resistance corresponding with the range of digital earth resistance tester, and utilize numeral
Formula earth resistance tester is measured, by the resistance of adjustment criteria resistance box, reaches the stabilization of measured value, is read digital
Numerical value on earth resistance tester；Universal meter is got into corresponding gear, while reading numerical values, are finally verified.
Claims (6)
1. a kind of digital grounding resistance test system, it is characterised in that：Including digital earth resistance tester, measuring resistance
Case, measuring resistance and universal meter；After described measuring resistance and universal meter are in parallel, then the electricity with digital earth resistance tester
Flow end and voltage end connection；Wherein one end of described standard resistance box and the ground connection terminal circuit of digital earth resistance tester
Connection, the other end is connected between measuring resistance and universal meter, and is formed back with the voltage end of digital earth resistance tester
Road；Described digital earth resistance tester mainly includes main control module, circuit protection module, balanced type input amplification electricity
Road, PWM controls constant-current source, buffer amplifier, filter unit, sampling module, A/D modular converters and power module；Described electricity
It is source module, PWM controls constant-current source, circuit protection module, main control module, A/D modular converters, buffer amplifier, filter unit, flat
Weighing apparatus formula input amplifying circuit, sampling module are sequentially connected in series.
2. a kind of digital grounding resistance test system according to claim 1, it is characterised in that：Described main control module master
To include data acquisition module, Data Analysis Services module, digital filtering module, memory module, keyboard and display.
3. a kind of digital grounding resistance test system according to claim 1, it is characterised in that：Described filter unit master
To include RC filter circuits, phase-locked loop circuit, counter, bilateral analog switch, resistor and capacitor.
4. a kind of digital grounding resistance test system according to claim 1, it is characterised in that：Described standard resistance box
Standard resistance range be 0.01-9999 ohm.
5. a kind of digital grounding resistance test system according to claim 1, it is characterised in that：Described measuring resistance
Resistance is 1 ohm, 10 ohm, 100 ohm, 500 ohm.
6. a kind of digital grounding resistance test system according to claim 1, it is characterised in that：The shelves of described universal meter
Position includes resistance grade, resistivity shelves, current gear and voltage gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710620752.1A CN107192887A (en) | 2017-07-26 | 2017-07-26 | A kind of digital grounding resistance test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710620752.1A CN107192887A (en) | 2017-07-26 | 2017-07-26 | A kind of digital grounding resistance test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107192887A true CN107192887A (en) | 2017-09-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710620752.1A Pending CN107192887A (en) | 2017-07-26 | 2017-07-26 | A kind of digital grounding resistance test system |
Country Status (1)
| Country | Link |
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| CN (1) | CN107192887A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831369A (en) * | 2017-12-19 | 2018-03-23 | 成都信息工程大学 | A kind of grounding resistance monitor instrument with self-test and correction |
| CN108512206A (en) * | 2018-04-13 | 2018-09-07 | 深圳远征技术有限公司 | A kind of surge protection circuit and device for earth resistance tester |
| CN110376493A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation value measurement method, device and storage medium |
-
2017
- 2017-07-26 CN CN201710620752.1A patent/CN107192887A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831369A (en) * | 2017-12-19 | 2018-03-23 | 成都信息工程大学 | A kind of grounding resistance monitor instrument with self-test and correction |
| CN107831369B (en) * | 2017-12-19 | 2020-07-03 | 成都信息工程大学 | Grounding resistance monitor with self-checking and correcting functions |
| CN108512206A (en) * | 2018-04-13 | 2018-09-07 | 深圳远征技术有限公司 | A kind of surge protection circuit and device for earth resistance tester |
| CN108512206B (en) * | 2018-04-13 | 2024-05-10 | 深圳远征技术有限公司 | Surge protection circuit and device for grounding resistance tester |
| CN110376493A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation value measurement method, device and storage medium |
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170922 |