CN104198877A - Portable multipoint grounding detector - Google Patents
Portable multipoint grounding detector Download PDFInfo
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- CN104198877A CN104198877A CN201410500328.XA CN201410500328A CN104198877A CN 104198877 A CN104198877 A CN 104198877A CN 201410500328 A CN201410500328 A CN 201410500328A CN 104198877 A CN104198877 A CN 104198877A
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Abstract
The invention discloses a portable multipoint grounding detector used for detecting that whether multipoint grounding exists in a mutual inductor common loop or not. The portable multipoint grounding detector comprises a constant flow source used for outputting current to the neutral conductor of the mutual inductor common loop, a current transducer used for detecting the grounding current of the common grounding point of the mutual inductor common loop and outputting a grounding current value, a voltage transducer used for detecting the voltage to ground of the common grounding point of the mutual inductor common loop and outputting a voltage to ground value, a keyboard used for receiving a setting parameter set by a user and a CPU used for receiving the grounding current value, the voltage to ground value and the setting parameter. According to the invention, whether the multipoint grounding exists in the mutual inductor common loop or not can be detected rapidly and conveniently, and when detection is conducted, both time and labor are saved, and the effect is relatively good.
Description
Technical field
The application relates to power technology field, more particularly, relates to a kind of portable multipoint earthing detector.
Background technology
According to the regulation of < < electric operating site safety rules > > and the reliability requirement of relay protection and aut.eq., mutual inductor common return must only have a reliable ground point.The equipment that the mutual inductor common return of general electric substation connects is a lot, is easy to cause mutual inductor common return to occur multipoint earthing phenomenon because of artificial origin or aging circuit, thereby causes protection exception action, there will be large area blackout in the time of serious.
Current power maintainer mainly investigates mutual inductor common return multipoint earthing by measuring the way of neutral line line zero-sequence current or measurement transformer secondary voltage drop, there is no special-purpose checkout equipment, detects to get up to waste time and energy, and effect is also poor.
Summary of the invention
In view of this, the application provides a kind of portable multipoint earthing detector, for detection of mutual inductor common return multipoint earthing whether.
To achieve these goals, the existing scheme proposing is as follows:
Whether a portable multipoint earthing detector, there is multipoint earthing for detection of mutual inductor common return, comprising:
Constant current source for from the neutral line output current to described mutual inductor common return;
For detection of the ground current of the common ground point of described mutual inductor common return, and export the current sensor of ground current value;
For detection of the voltage-to-ground of the common ground point of described mutual inductor common return, and export the voltage sensor of voltage-to-ground value;
For receiving the keyboard of the setting parameter of user's setting;
Be used for receiving described ground current value, described voltage-to-ground value and described setting parameter, and according to the relation of the current value of described ground current value and described constant current source output, the size of described ground voltage value and/or CPU that whether described setting parameter exists multipoint earthing to judge to described mutual inductor common return.
Preferably, described current sensor comprises:
For measuring the ground current of described common ground point, and export the clamp on amperemeter of ground current measured value;
Output terminal is connected with described CPU, for receiving described ground current measured value and converting the first analog to digital conversion circuit of described ground current value to.
Preferably, described voltage sensor comprises:
For measuring the voltage-to-ground of described common ground point, and export the voltage table of voltage-to-ground measured value;
Output terminal is connected with described CPU, for receiving described voltage-to-ground measured value and converting the second analog to digital conversion circuit of described voltage-to-ground value to.
Preferably, also comprise:
Be connected with described CPU, for showing the display device of judged result, running status and/or the described setting parameter of described CPU.
Preferably, described display device comprises LCDs.
Preferably, also comprise:
Be connected with described CPU, for when described CPU judgment result is that multipoint earthing time the warning device of reporting to the police.
Preferably, described warning device comprises audible alarm unit, light warning device and/or alarm communication system port.
Preferably, described alarm communication system port is RS485 port.
Preferably, also comprise:
Be connected with described CPU, for storing the data-carrier store of the judged result of described CPU.
Preferably, the output voltage of described constant current source is 0-50mV, and the output current of described constant current source is 0-0.2A.
From technique scheme, can find out, the disclosed portable multipoint earthing detector of the application is provided with current sensor, voltage sensor, for the treatment of current data and voltage data the CPU judging and other auxiliary equipment, can detect quickly and easily whether multipoint earthing of mutual inductor common return, it is time saving and energy saving to detect, and effect is better.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the disclosed a kind of portable multipoint earthing detector structural drawing of the embodiment of the present application;
Fig. 2 is the use schematic diagram of the disclosed portable multipoint earthing detector of the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
Fig. 1 is the disclosed a kind of portable multipoint earthing detector structural drawing of the embodiment of the present application.
As shown in Figure 1, the portable multipoint earthing detector that the present embodiment provides comprises CPU10, constant current source 50, current sensor 20, voltage sensor 30, keyboard 40, liquid crystal display 60, warning device 70 and data-carrier store 80, wherein, CPU10 is connected with constant current source 50, current sensor 20, voltage sensor 30, keyboard 40, liquid crystal display 60, warning device 70 and data-carrier store 80 respectively.
In an embodiment, the output voltage of constant current source 50 can be 0-50mV, and output current can be 0-0.2A.In addition, at constant current source 50, be provided with control end, and control end is connected with CPU10, the steering order sending for receiving CPU10, and can change the size of output voltage and the size of output current according to the steering order of CPU10.
Current sensor 20 is for detection of mutual inductor common return ground current.In the embodiment of the present application, current sensor 20 comprises: clamp on amperemeter 21 and the first analog to digital conversion circuit, wherein clamp on amperemeter 21 is connected with the described common ground point of mutual inductor common return, for ground current is measured, clamp on amperemeter 21 is provided with output terminal, and output terminal is used for output current measured value;
The input end of the first analog to digital conversion circuit 22 is connected with the output terminal of clamp on amperemeter 21, the first analog to digital conversion circuit 22 is for current measurement value being converted to digital ground current value, and ground current value is input in CPU10 as mutual inductor common return one of the basis for estimation of multipoint earthing whether.
Voltage sensor 30 comprises reometer 31 and the second analog to digital conversion circuit 32, wherein: reometer 31 is for measuring the voltage-to-ground value of common ground point, and reometer 31 is provided with output terminal;
The second analog to digital conversion circuit 32 is provided with input end, its input end is connected with the output terminal of voltage table 31, for voltage measuring value is converted to digital ground voltage value, and input CPU10 as mutual inductor common return one of the basis for estimation of multipoint earthing whether.
From technique scheme, can find out, the disclosed portable multipoint earthing detector of the application is provided with current sensor, voltage sensor, for the treatment of current data and voltage data the CPU judging and other auxiliary equipment, can detect quickly and easily whether multipoint earthing of mutual inductor common return, it is time saving and energy saving to detect, and effect is better.
Keyboard 40 is as the interface of man-machine exchange, and operator can be by keyboard 40 to CPU10 input setting parameter; Liquid crystal display 60 is connected with CPU10, as the interface of man-machine exchange, for show the setting parameter of input, running status and testing result etc. to user.
Can also substitute keyboard 40 and LCDs 60 with touch-screen, by user interface, with independent touch-screen, complete the work of keyboard 40 and display screen 60 simultaneously.Touch-screen can be regarded as the combination form of keyboard 40 and liquid crystal display 60.
Warning device 70 is connected with CPU10, for notify operator when testing result is multipoint earthing.Display device, be LCDs 60 for testing result is shown, warning device 70 is that one of LCDs 60 is supplemented, when measuring place and be positioned at dim regulator cubicle, warning device 70 is more effective.Warning device 70 can be audible alarm unit, when testing result is multipoint earthing, sounds and reports to the police; Also can be light warning device, when testing result is multipoint earthing, send high light, red blue light or other light operator is pointed out; Warning device 70 can also be alarm communication system port, by PORT COM, is connected with other equipment, and alerting signal is transferred on the equipment being connected with this PORT COM.This alarm communication system port can be RS485 port, and above listed warning device 70 can only arrange a kind of, also can arrange several simultaneously.
Data-carrier store 80 is connected with CPU10, extended memory as CPU10, for storing the routine data of CPU10, or for storing the operation result of CPU10, the result store of monitoring is at every turn got up, can, by stored data output, for people, analyze the situation of all previous detection where necessary.
Fig. 2 is the use schematic diagram of the disclosed portable multipoint earthing detector of the embodiment of the present application.
When mutual inductor common return is detected, the portable multipoint earthing detector that this upper embodiment need to be provided and mutual inductor common return are by carrying out wiring shown in Fig. 2.
The positive pole of the output terminal of constant current source 50 is connected with the neutral line 90 of mutual inductor common return, minus earth.Constant current source 50 is to the neutral line 90 output currents under the control of CPU10, and the clamp on amperemeter 21 in current sensor 20 is stuck on the common ground line 92 of the neutral line, to detect ground current, and to CPU10 output ground current value.Because the neutral line 90 only allows by common ground point 91 one point earths under normal condition, therefore, if 90 of the neutral lines join with ground at common ground point 91 places, the ground current value that electric current of constant current source 50 outputs records with current sensor 20 just should be consistent, if inconsistent just explanation also exists other earth point, the electric current of constant current source 50 outputs has been shunted from other earth point.CPU10 is by comparing to judge whether have multipoint earthing to the ground current value of the current output value of constant current source 50 and common ground point 91.
In addition, by the voltage-to-ground of 30 pairs of common ground points 91 of voltage sensor, measure, when increasing the output current of constant current source 50, if voltage-to-ground remains unchanged, there is multipoint earthing in explanation; If voltage increases with the output current of constant current source 10, there is not the situation of multipoint earthing in explanation.
CPU10 is by the relation of the comprehensive comparison output current of constant current source 50 and the output current of the ground current value of common ground point 91 and constant current source 50 and the voltage-to-ground value of common ground point 91, through calculating, can obtain mutual inductor common return and whether have multipoint earthing, and by LCDs 60 output detections results, if there is multipoint earthing, also by warning device 70, report to the police, and further testing result is outputed to data-carrier store 80 preservations.
Utilize this portable multipoint earthing detector respectively the different branches that are connected on the neutral line 90 to be detected, can detect specifically which branch and have earth point, further dwindle the scope that needs inspection, can find very soon unnecessary earth point, and by its elimination.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the application.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can be in the situation that do not depart from the application's spirit or scope, realization in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. whether a portable multipoint earthing detector, there is multipoint earthing for detection of mutual inductor common return, it is characterized in that, comprising:
Constant current source for from the neutral line output current to described mutual inductor common return;
For detection of the ground current of the common ground point of described mutual inductor common return, and export the current sensor of ground current value;
For detection of the voltage-to-ground of the common ground point of described mutual inductor common return, and export the voltage sensor of voltage-to-ground value;
For receiving the keyboard of the setting parameter of user's setting;
Be used for receiving described ground current value, described voltage-to-ground value and described setting parameter, and according to the relation of the current value of described ground current value and described constant current source output, the size of described ground voltage value and/or CPU that whether described setting parameter exists multipoint earthing to judge to described mutual inductor common return.
2. portable multipoint earthing detector as claimed in claim 1, is characterized in that, described current sensor comprises:
For measuring the ground current of described common ground point, and export the clamp on amperemeter of ground current measured value;
Output terminal is connected with described CPU, for receiving described ground current measured value and converting the first analog to digital conversion circuit of described ground current value to.
3. portable multipoint earthing detector as claimed in claim 1, is characterized in that, described voltage sensor comprises:
For measuring the voltage-to-ground of described common ground point, and export the voltage table of voltage-to-ground measured value;
Output terminal is connected with described CPU, for receiving described voltage-to-ground measured value and converting the second analog to digital conversion circuit of described voltage-to-ground value to.
4. the portable multipoint earthing detector as described in claim 1～3 any one, is characterized in that, also comprises:
Be connected with described CPU, for showing the display device of judged result, running status and/or the described setting parameter of described CPU.
5. portable multipoint earthing detector as claimed in claim 4, is characterized in that, described display device comprises LCDs.
6. portable multipoint earthing detector as claimed in claim 4, is characterized in that, also comprises:
Be connected with described CPU, for when described CPU judgment result is that multipoint earthing time the warning device of reporting to the police.
7. portable multipoint earthing detector as claimed in claim 6, is characterized in that, described warning device comprises audible alarm unit, light warning device and/or alarm communication system port.
8. portable multipoint earthing detector as claimed in claim 7, is characterized in that, described alarm communication system port is RS485 port.
9. portable multipoint earthing detector as claimed in claim 7, is characterized in that, also comprises:
Be connected with described CPU, for storing the data-carrier store of the judged result of described CPU.
10. portable multipoint earthing detector as claimed in claim 9, is characterized in that, the output voltage of described constant current source is 0-50mV, and the output current of described constant current source is 0-0.2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410500328.XA CN104198877A (en) | 2014-09-26 | 2014-09-26 | Portable multipoint grounding detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410500328.XA CN104198877A (en) | 2014-09-26 | 2014-09-26 | Portable multipoint grounding detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196082A (en) * | 2019-07-11 | 2019-09-03 | 谢明仿 | A kind of environment monitoring device and method of electronic mutual inductor |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06313780A (en) * | 1993-04-28 | 1994-11-08 | Toyo Commun Equip Co Ltd | Detecting device of ground fault |
| JP2003075514A (en) * | 2001-09-06 | 2003-03-12 | Matsushita Electric Ind Co Ltd | Tester and testing method |
| CN101159376A (en) * | 2007-09-26 | 2008-04-09 | 东北大学 | Low current neutral grounding malfunction detection and positioning device and method |
| CN101256205A (en) * | 2007-02-27 | 2008-09-03 | 上海久电科技开发有限公司 | Instrument for measuring and recording mutation current of neutral point earthing resistor |
| CN202975229U (en) * | 2012-12-17 | 2013-06-05 | 山西省电力公司运城供电分公司 | Multipoint earthing detection locator for secondary circuits of transformer substations |
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN203490313U (en) * | 2013-07-01 | 2014-03-19 | 广州勤正电力科技有限公司 | PT secondary loop multi-point grounding alarming and positioning system |
| CN203658510U (en) * | 2013-11-29 | 2014-06-18 | 国家电网公司 | Voltage transformer secondary circuit grounding detector |
| CN103901314A (en) * | 2014-03-26 | 2014-07-02 | 国家电网公司 | Online monitoring device for monitoring power transformer core ground faults and online monitoring method of online monitoring device |
-
2014
- 2014-09-26 CN CN201410500328.XA patent/CN104198877A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06313780A (en) * | 1993-04-28 | 1994-11-08 | Toyo Commun Equip Co Ltd | Detecting device of ground fault |
| JP2003075514A (en) * | 2001-09-06 | 2003-03-12 | Matsushita Electric Ind Co Ltd | Tester and testing method |
| CN101256205A (en) * | 2007-02-27 | 2008-09-03 | 上海久电科技开发有限公司 | Instrument for measuring and recording mutation current of neutral point earthing resistor |
| CN101159376A (en) * | 2007-09-26 | 2008-04-09 | 东北大学 | Low current neutral grounding malfunction detection and positioning device and method |
| CN202975229U (en) * | 2012-12-17 | 2013-06-05 | 山西省电力公司运城供电分公司 | Multipoint earthing detection locator for secondary circuits of transformer substations |
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN203490313U (en) * | 2013-07-01 | 2014-03-19 | 广州勤正电力科技有限公司 | PT secondary loop multi-point grounding alarming and positioning system |
| CN203658510U (en) * | 2013-11-29 | 2014-06-18 | 国家电网公司 | Voltage transformer secondary circuit grounding detector |
| CN103901314A (en) * | 2014-03-26 | 2014-07-02 | 国家电网公司 | Online monitoring device for monitoring power transformer core ground faults and online monitoring method of online monitoring device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196082A (en) * | 2019-07-11 | 2019-09-03 | 谢明仿 | A kind of environment monitoring device and method of electronic mutual inductor |
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