CN202256507U - Grounding resistance monitoring device - Google Patents
Grounding resistance monitoring device Download PDFInfo
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- CN202256507U CN202256507U CN2011203984019U CN201120398401U CN202256507U CN 202256507 U CN202256507 U CN 202256507U CN 2011203984019 U CN2011203984019 U CN 2011203984019U CN 201120398401 U CN201120398401 U CN 201120398401U CN 202256507 U CN202256507 U CN 202256507U
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Abstract
The utility model provides a grounding resistance monitoring device, which is characterized in that the grounding resistance monitoring device comprises a main station monitoring part and a plurality of field test parts. The main station monitoring part is connected with each field test part by a data line, wherein the main station monitoring part consists of a PC (Personal Computer) machine and a communication protocol converter; one side of the communication protocol converter is connected with a serial port of the PC machine, and the other side of the communication protocol converter is connected with the field test parts by the data lines; each field test part comprises a microprocessor, a constant-voltage generator, a current detector, a voltage coil and a current coil, wherein the constant-voltage generator and the current detector are respectively connected with the microprocessor; the voltage coil is connected with the constant-voltage generator; and the current coil is connected with the current detector. The grounding resistance monitoring device well solves the anti-interference problem in a test process by using measures, such as microcomputer processing control, signal processing, etc., so as to simplify the test operation process, improve the precision and the accuracy of the test result and greatly reduce the labor strength and the test cost.
Description
Technical field:
The utility model relates to the stake resistance monitoring device that the grounding resistance of grounded screen or ground wire is monitored.
Background technology:
Ground connection is divided into place of working (power supply ground), protection ground, lightning proof ground, shielding ground etc. usually; The main effect of these ground wires has: the safety that current path, protection human body or equipment are provided; The mode of ground connection is normally buried conductors such as metal ground stud, wire netting underground, and conductor is connected with the equipment, the object that need ground connection through cable or steel band again.Grounding resistance is grounded screen or ground wire the key technical indexes.The factor that influences grounding resistance is a lot: the size of ground stud, net (length, thickness), shape, quantity, the depth of burying, geographical environment (is different like level land, irrigation canals and ditches, hillside fields), soil moisture, soil mineral content or the like on every side; Therefore, the grounding resistance monitoring is particularly important in just seeming.
In electric system, the main at present big electric current three electrode method of power frequency that adopts of the test of the stake resistance of grounded screen is measured at present.The power frequency that produces when preventing operation of power networks is disturbed, and improves the accuracy of measurement result, and the test current of the big current method of power frequency must not be less than 30 amperes.Problems such as thus, it is heavy testing equipment just to have occurred, and process of the test is complicated, and the testing crew working strength is big, and test period is long.
Summary of the invention:
The purpose of the utility model is to design measures such as a kind of employing MICROCOMPUTER PROCESSING control and signal Processing; Solve the anti-interference problem in the test process; The short form test operating process; Improve the precision and the accuracy of test result, reduce the labour intensity of testing crew and the stake resistance monitoring device of testing cost.
The concrete technical scheme that the utility model adopts is: a kind of stake resistance monitoring device; It is characterized in that this device comprises a main website monitoring part and a plurality of on-the-spot test part; Connect through data line between main website monitoring part and each on-the-spot test part, wherein:
Main website monitoring part is made up of a PC and communication protocols converter, and communication protocols converter is connected with the serial ports of PC on one side, and another side partly is connected with on-the-spot test through data line;
On-the-spot test partly comprises: microprocessor, constant potential generator that is connected with microprocessor respectively and current detector, the potential winding that is connected with constant potential generator, the current coil that is connected with current detector.
The utility model mainly provides a kind of general design idea of stake resistance monitoring device, described PC, communication protocols converter, microprocessor, constant potential generator, current detector, etc. can adopt traditional circuit common device.
The potential winding that the front end bayonet socket (in solenoid is arranged) that this device utilizes electromagnetic induction principle to pass through apparatus of the present invention is constituted is sent into a constant alternating voltage E to tested grounded screen; This voltage is applied in the loop; Measure current in loop I through current coil in its front end bayonet socket simultaneously; According to E and I, can calculate the resistance in the loop, the resistance of measured point: Rx=E/I.
The advantage and the effect of the utility model are: adopted novel AC power; And measures such as MICROCOMPUTER PROCESSING control and signal Processing have been adopted; Well solved the anti-interference problem in the test process; Simplify the test operation process, improved the precision and the accuracy of test result, greatly reduced the labour intensity and the testing cost of testing crew.Do not need the subtest stake, need not break off ground wire yet, thereby, realize that the method is convenient, fast, and is time saving and energy saving, is very easy to grounding resistance measurement work to carrying out on-line dynamic measurement in the ground resistance with equipment.
Description of drawings:
Fig. 1 is a stake resistance monitoring device principle schematic.
Fig. 2 is a stake resistance monitoring device system applies synoptic diagram.
Fig. 3 specifically uses one of synoptic diagram.
Fig. 4 specifically uses two of synoptic diagram.
Embodiment:
Below in conjunction with above-mentioned accompanying drawing, further specify concrete technical scheme, principle of work and the networking application implementation way of the utility model.
A kind of stake resistance monitoring device is characterized in that this device comprises a main website monitoring part and a plurality of on-the-spot test part, connects through data line between main website monitoring part and each on-the-spot test part, wherein:
Main website monitoring part is made up of a PC and communication protocols converter, and communication protocols converter is connected with the serial ports of PC on one side, and another side partly is connected with on-the-spot test through data line;
On-the-spot test partly comprises: microprocessor, constant potential generator that is connected with microprocessor respectively and current detector, the potential winding that is connected with constant potential generator, the current coil that is connected with current detector.
Like Fig. 2, system forms and application principle is:
This stake resistance monitoring device is made up of two on-the-spot test parts and main website monitoring part two parts; On-the-spot test partly is installed in the place that needs monitoring grounding resistance; Main website monitoring part is installed in control center or center on duty, is convenient to the operator on duty and observes.Two parts information transmission is carried out through the RS-485 bus.
The on-the-spot test part is accomplished the timing measurement of this stake resistance and is uploaded to main website to the grounding resistance of monitoring point in each monitoring point; Main website monitoring part order is partly accepted in on-the-spot test in addition, the oneself state information uploading.
Main website monitoring part is made up of PC and a communication protocols converter that the main website monitoring of software is housed, and communication protocols converter one side is connected with the RS232 serial ports of PC, and another side partly is connected with on-the-spot test on the test point through the RS485 bus; The main website monitoring of software can be monitored the situation of each test point of total system.Setting measurement interval time; Can demarcate the raw information of each point, when the information that transmits when the scene is unusual, audible and visual alarm and with data storage in database; Inquire about the current data and the running status of each monitoring point, and functions such as the inquiry of historical data, printing, deletion are provided.
R
1, R
2, R
3R
NGround resistance for other earth point in the distributed earthed system.Fig. 2 further equivalence is Fig. 1.During measurement; The in-site measurement system utilizes electromagnetic induction principle to send into a constant voltage E through its potential winding to tested ground stud; This voltage is applied in the loop shown in Figure 1, and the current coil of in-site measurement system can be measured current in loop I simultaneously, according to E and I; Can calculate the resistance in the loop, that is:
E/I＝R
X+R
P
R
P＝1/(1/R1+1/R2+...+1/Rn)，
R
PBe the all-in resistance after R1, the R2...Rn parallel connection
In the Distributed Multi earthed system, Rx＞＞1/ (1/R1+1/R2+...+1/Rn) is arranged usually, then hindered by geodetic:
Rx＝E/I。
Wherein: R
XStake resistance for the desire survey.R
pBe the equivalent resistance after the stake resistance parallel connection of all earth points.
The on-the-spot test part
The on-the-spot test part partly is made up of microprocessor, constant potential generator, potential winding, current coil, current detecting etc.Constant potential generator produces the interchange constant voltage of 1.7kHz, and the electromagnetic transducer special through potential winding couples a signal to ground stud; Through behind the grounding body; 1.7kHz AC signal be coupled to current coil; Input is partly accomplished filtering, amplification, the A/D conversion to this signal; Microprocessor is accomplished signal Processing, various information uploading and is accepted main website monitoring part order, has only the electric current that voltage produced of 1.7kHz to be detected like this.Just because of like this, just got rid of the Weak current on the ground wire that high frequency noise brought that commercial ac power and equipment itself produces, to obtain measurement result accurately.
The key technical indexes
The environment for use condition
Power supply: AC220V ± 10%, 50Hz
Working temperature: 0 ℃～+ 50 ℃
Relative humidity :≤85%RH
External magnetic field:＜40A/m, external electrical field:＜1V/m
The single measurement time: 1 second,
Multi-point sampler interval time: 1 minute
Resistance measurement frequency: 1.7KHz
Resistance measurement highest resolution: 0.01 Ω
Resistance measurement scope: 0.01-1000 Ω
Resistance warning critical value setting scope: 1-199 Ω
Concrete applicating example:
1, the stake resistance monitoring device monitoring that can be applied to the electric system stake resistance is like (1). the monitoring of powerline pole tower ground resistance, and electric power line pole tower ground connection constitutes the multipoint earthing system usually, easily the monitoring grounding resistance; (2). the monitoring of transformer neutral point stake resistance; (3). generating plant, the monitoring of substation ground net stake resistance.
2, the stake resistance monitoring device monitoring that can be applied to the telecommunication system stake resistance is like (1). the monitoring of floor machine room stake resistance; The machine room of telecommunication system often is located at the upper strata of building; Use megger to measure very difficulty, then very convenient with the native system monitoring; (2). the monitoring of machine room, mobile base station, microwave tower stake resistance, machine room, mobile base station, microwave tower ground connection constitute the multipoint earthing system usually, and is then very convenient with the native system monitoring, sees Fig. 3.
3, be applied to the monitoring of important building lightning protection resistance: the earthing pole of buildings such as mutual independence, then very convenient with the native system monitoring, Fig. 4 is seen in the stake resistance monitoring of each earthing pole.
Claims (1)
1. a stake resistance monitoring device is characterized in that this device comprises a main website monitoring part and a plurality of on-the-spot test part, connect through data line between main website monitoring part and each on-the-spot test part, wherein:
Main website monitoring part is made up of a PC and communication protocols converter, and communication protocols converter is connected with the serial ports of PC on one side, and another side partly is connected with on-the-spot test through data line;
On-the-spot test partly comprises: microprocessor, constant potential generator that is connected with microprocessor respectively and current detector, the potential winding that is connected with constant potential generator, the current coil that is connected with current detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203984019U CN202256507U (en) | 2011-10-19 | 2011-10-19 | Grounding resistance monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203984019U CN202256507U (en) | 2011-10-19 | 2011-10-19 | Grounding resistance monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202256507U true CN202256507U (en) | 2012-05-30 |
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ID=46117726
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203984019U Expired - Fee Related CN202256507U (en) | 2011-10-19 | 2011-10-19 | Grounding resistance monitoring device |
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| Country | Link |
|---|---|
| CN (1) | CN202256507U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018571A (en) * | 2012-12-05 | 2013-04-03 | 北京工业大学 | Dual-coupling type on-line monitoring device of ground impedance of electric transmission line |
| CN103941097A (en) * | 2014-04-30 | 2014-07-23 | 国家电网公司 | Large ground grid grounding resistance real-time monitor |
| CN106597213A (en) * | 2016-11-11 | 2017-04-26 | 华北电力大学（保定） | Distributed power transmission and distribution line maintenance operation safety protection digital monitoring system |
| WO2018141259A1 (en) * | 2017-02-04 | 2018-08-09 | 山西全安新技术开发有限公司 | Grounding monitoring system, method and device, and computer-readable storage medium |
-
2011
- 2011-10-19 CN CN2011203984019U patent/CN202256507U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018571A (en) * | 2012-12-05 | 2013-04-03 | 北京工业大学 | Dual-coupling type on-line monitoring device of ground impedance of electric transmission line |
| CN103941097A (en) * | 2014-04-30 | 2014-07-23 | 国家电网公司 | Large ground grid grounding resistance real-time monitor |
| CN106597213A (en) * | 2016-11-11 | 2017-04-26 | 华北电力大学（保定） | Distributed power transmission and distribution line maintenance operation safety protection digital monitoring system |
| CN106597213B (en) * | 2016-11-11 | 2019-11-19 | 华北电力大学（保定） | Distributed electric line upkeep operation safeguard protection digitized monitoring system |
| WO2018141259A1 (en) * | 2017-02-04 | 2018-08-09 | 山西全安新技术开发有限公司 | Grounding monitoring system, method and device, and computer-readable storage medium |
| US11061079B2 (en) | 2017-02-04 | 2021-07-13 | Shanxi Quan'an New Technology Development Co., Ltd. | Grounding monitoring system, method, device and computer readable storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20141019 |
|
| EXPY | Termination of patent right or utility model |