CN104749476A - Grounding detection device and grounding detection method - Google Patents
Grounding detection device and grounding detection method Download PDFInfo
- Publication number
- CN104749476A CN104749476A CN201310728184.9A CN201310728184A CN104749476A CN 104749476 A CN104749476 A CN 104749476A CN 201310728184 A CN201310728184 A CN 201310728184A CN 104749476 A CN104749476 A CN 104749476A
- Authority
- CN
- China
- Prior art keywords
- signal
- voltage
- earthing detection
- test line
- clamp control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention provides a grounding detection device and a grounding detection method. The grounding detection device comprises a signal preprocessing unit, a clamping control unit, a conversion unit, and a grounding detection unit, all of which are sequentially connected. The signal preprocessing unit is used for preprocessing received alternating-current electrical signals so as to eliminate interference signals in the alternating-current electrical signals; the clamping control unit is used for carrying out clamping control on the alternating-current electrical signals after preprocessing so as to clamp the voltage of the alternating-current electrical signals to a first set voltage; the conversion unit is used for converting the alternating-current electrical signals with the voltage being the first set voltage into direct-current electrical signals; and the grounding detection unit is used for judging whether a detected circuit is grounded or not by adopting preset judgment rules according to the received direct-current electrical signals. By adopting the technical scheme provided by the invention, the grounding detection device can be effectively protected from being damaged by impact of transient interference voltage.
Description
Technical field
The present invention relates to a kind of detection technique, particularly relate to a kind of earthing detection equipment and ground detecting method.
Background technology
Overhead transmission line be with insulator transmission pressure is fixed on stand on ground shaft tower on the transmission line of electricity of electric energy transmitting.Overhead transmission line is newly-built or after having overhauled, and staff needs the dismounting situation checking artificial earthing, if do not remove artificial earthing's point, when circuit parameter testing or line start, just there will be exception.The detection ultimate principle of existing earthing detection equipment judges whether to there is ground connection by the impedance of measuring between overhead transmission line and the earth.If do not have Grounding, impedance can be very large; If there is Grounding, impedance can be very low.
In fact, overhead transmission line can produce the interference of transient voltage.These disturb the induced electricity usually come from overhead transmission line, static discharge etc.Glitch voltage is the highest may reach tens kilovolts, and the interference voltage of tens kilovolts is enough to damage conventional electron device.If do not process glitch voltage, staff directly uses existing earthing detection equipment to detect, and earthing detection equipment is very easily subject to the impact of the glitch voltage that overhead transmission line produces and damages.
Summary of the invention
The invention provides a kind of earthing detection equipment and ground detecting method, damage from the impact of glitch voltage with proterctive equipment.
The object of the invention to solve the technical problems realizes by the following technical solutions.
The present invention first aspect proposes a kind of earthing detection equipment, comprising: the Signal Pretreatment unit connected successively, clamp control module, converting unit and earthing detection unit; Wherein,
Described Signal Pretreatment unit, for carrying out pre-service to the ac signal received, to eliminate the undesired signal in described ac signal;
Described clamp control module, for carrying out clamp control to pretreated described ac signal, with by the voltage clamp of described ac signal to the first setting voltage;
Described converting unit, for being that the described ac signal of described first setting voltage is converted to DC signal by voltage;
Described earthing detection unit, for according to the described DC signal received, adopts the decision rule preset to judge whether test line exists ground connection.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Preferably, aforesaid earthing detection equipment, wherein said Signal Pretreatment unit is RC filtering circuit, and described RC filtering circuit comprises: the first resistance and the first electric capacity, wherein,
One end of described first resistance is connected with the high pressure line end of described test line, and the other end of described first resistance is connected with one end of described first electric capacity;
The other end of described first electric capacity is connected with the earth terminal of described test line.
Preferably, aforesaid earthing detection equipment, wherein said clamp control module comprises: the first clamp control circuit connected successively and the second clamp control circuit, wherein,
Described first clamp control circuit, for carrying out clamp control to pretreated described ac signal, with by the voltage clamp of described ac signal to the second setting voltage;
Described second clamp control circuit, for being that the ac signal of described second setting voltage carries out clamp control to voltage, with by the voltage clamp of described ac signal to described first setting voltage;
Wherein, described first setting voltage is less than described second setting voltage.
Preferably, aforesaid earthing detection equipment, wherein, described first clamp control circuit comprises: the first voltage dependent resistor (VDR) and the second voltage dependent resistor (VDR); Wherein,
Described first voltage dependent resistor (VDR) one end is connected with the high pressure line end of described test line, and the other end of described first voltage dependent resistor (VDR) is connected with one end of described second voltage dependent resistor (VDR);
The other end of described second voltage dependent resistor (VDR) is connected with the earth terminal of described test line.
Preferably, aforesaid earthing detection equipment, wherein, described second clamp control circuit comprises: the first unidirectional Transient Suppression Diode TVS pipe and the second unidirectional TVS pipe; Wherein,
The described positive pole of the first unidirectional TVS pipe is connected with the high pressure line end of described test line, and the negative pole of described first unidirectional TVS pipe is connected with the negative pole of described second unidirectional TVS pipe;
The positive pole of described second unidirectional TVS pipe is connected with the earth terminal of described test line.
Preferably, aforesaid earthing detection equipment, wherein, described converting unit comprises: the second resistance, the 3rd resistance, the first diode, the second diode and the second electric capacity, wherein,
One end of described second resistance is connected with the high pressure line end of described test line, and the other end of described second resistance is connected with the DC signal input end of described earthing detection unit;
The negative electrode of the first diode is connected with the DC signal input end of described earthing detection unit, and the anode of described first diode is connected with default high level;
The negative electrode of described second diode is connected with the DC signal input end of described earthing detection unit, the plus earth of described second diode;
One end of second electric capacity is connected with the DC signal input end of described earthing detection unit, the other end ground connection of described second electric capacity;
One end of 3rd resistance is connected with the DC signal input end of described earthing detection unit, and the other end of described 3rd resistance is connected with described default high level.
Preferably, aforesaid earthing detection equipment, wherein, described earthing detection unit comprises: power circuit, analog to digital converter and processor; Wherein,
Described power circuit, for providing working power for described analog to digital converter and described processor;
Described analog to digital converter, for the described DC signal received is converted to digital signal, and exports described digital signal to described processor;
Described processor, for according to described digital signal, adopts the decision rule preset to judge whether test line exists ground connection, and generates corresponding control signal.
Preferably, aforesaid earthing detection equipment, also comprises: alarm unit;
Described earthing detection unit, also for when judging that described test line exists ground connection, generates controlling alarm instruction;
Described alarm unit, for receiving the described controlling alarm instruction that described earthing detection unit exports, and according to described controlling alarm instruction, performs corresponding alarm response.
Wherein, described alarm unit is hummer or alarm lamp.
The present invention second aspect proposes a kind of ground detecting method, comprising:
Pre-service is carried out to the ac signal received, to eliminate the undesired signal in described ac signal;
Clamp control is carried out to pretreated described ac signal, with by the voltage clamp of described ac signal to the first setting voltage;
Be that the described ac signal of described first setting voltage is converted to DC signal by voltage;
According to the described DC signal received, the decision rule preset is adopted to judge whether test line exists ground connection.
Preferably, aforesaid ground detecting method, wherein, the described DC signal that described basis receives, adopts the decision rule preset to judge whether test line exists ground connection, and generates corresponding control signal, comprising:
The described DC signal received is converted to digital signal;
According to described digital signal, calculate the impedance between described test line and ground;
Judge whether described impedance is greater than setting value, if be greater than, then judge that described test line does not exist ground connection; Otherwise, judge that described test line exists ground connection.
By technique scheme, earthing detection equipment provided by the invention at least has following advantages:
Technical scheme provided by the invention; the undesired signal in the ac signal received can be eliminated by signalization pretreatment unit; when can there is the larger glitch voltage of energy by arranging clamp control module on test line; alternating current voltage is clamped to the electric pressure of setting; for follow-up earthing detection unit provides reliable protection, and then effective protective ground checkout equipment damages from the impact of glitch voltage.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, coordinates accompanying drawing to be described in detail as follows below with preferred embodiment of the present invention.
Accompanying drawing explanation
A kind of structural representation realized of the earthing detection equipment that Fig. 1 provides for the embodiment of the present invention one;
The circuit realiration schematic diagram of Signal Pretreatment unit, clamp control module and converting unit in the earthing detection equipment that Fig. 2 provides for the embodiment of the present invention one;
In the earthing detection equipment that Fig. 3 provides for the embodiment of the present invention one, Signal Pretreatment unit and converting unit adopt the circuit realiration schematic diagram of Redundancy Design;
The structural representation of earthing detection unit in the earthing detection equipment that Fig. 4 provides for the embodiment of the present invention one;
The structural representation of the another kind realization of the earthing detection equipment that Fig. 5 provides for the embodiment of the present invention one;
The schematic flow sheet of the ground detecting method that Fig. 6 provides for the embodiment of the present invention two.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the structural representation of earthing detection equipment that provides of the embodiment of the present invention one.As shown in Figure 1, the earthing detection equipment described in the present embodiment one comprises: the Signal Pretreatment unit 1 connected successively, clamp control module 2, converting unit 3 and earthing detection unit 4.Wherein, described Signal Pretreatment unit 1 for carrying out pre-service to the ac signal received, to eliminate the undesired signal in described ac signal.Described clamp control module 2 for carrying out clamp control to pretreated described ac signal, with by the voltage clamp of described ac signal to the first setting voltage.Described converting unit 3 is for being that the described ac signal of described first setting voltage is converted to DC signal by voltage.Described earthing detection unit 4, for according to the described DC signal received, adopts the decision rule preset to judge whether test line exists ground connection.
The earthing detection equipment that the present embodiment provides; the undesired signal in the ac signal received can be eliminated by signalization pretreatment unit; when can there is the larger induced electricity of voltage by arranging clamp control module on test line; alternating current voltage is clamped to the electric pressure of setting; for follow-up earthing detection unit provides reliable protection, and then avoid glitch voltage to the impact of equipment.
Further, the Signal Pretreatment unit 1 described in above-described embodiment can be specially RC filtering circuit.As shown in Figure 2, described RC filtering circuit comprises: the first resistance R1 and the first electric capacity C1.Wherein, one end of described first resistance R1 is connected with the high pressure line end HV of described test line, and the other end of described first resistance R1 is connected with one end of described first electric capacity C1.The other end of described first electric capacity C1 is connected with the earth terminal of described test line.RC filtering circuit can eliminate the electrostatic be present on test line.When test line existing the larger instantaneous interference voltage of energy, RC filtering circuit can provide a low-impedance discharge loop, and what instantaneous interference voltage can not be risen is too high.Here you need to add is that: consider in above-mentioned RC circuit a resistance R1 is set may be excessive and damage because of the power born, above-mentioned RC circuit can adopt Redundancy Design, and namely connect a resistance R2 in described RC circuit again.As shown in Figure 3, connect a resistance R2 between described first resistance R1 and described first electric capacity C1.
Further, the described clamp control module in above-described embodiment can adopt the circuit structure shown in Fig. 2 to realize.Particularly, as shown in Figure 2, described clamp control module comprises: the first clamp control circuit 21 and the second clamp control circuit 22 connected successively.Wherein, described first clamp control circuit 21 for carrying out clamp control to pretreated described ac signal, with by the voltage clamp of described ac signal to the second setting voltage.Described second clamp control circuit 22 for being that the ac signal of described second setting voltage carries out clamp control to voltage, with by the voltage clamp of described ac signal to described first setting voltage.Described first setting voltage is less than described second setting voltage.
Such as, in actual applications, described first setting voltage can be specially 1000VAC, and described second setting voltage can be specially 400VAC.
More specifically, as shown in Figure 2, the described first clamp control circuit 21 in above-described embodiment comprises: the first voltage dependent resistor (VDR) R3 and the second voltage dependent resistor (VDR) R4.Wherein, described first voltage dependent resistor (VDR) R3 one end is connected with the high pressure line end HV of described test line, and the other end of described first voltage dependent resistor (VDR) R3 is connected with one end of described second voltage dependent resistor (VDR) R4.The other end of described second voltage dependent resistor (VDR) R4 is connected with the earth terminal of described test line.
Voltage dependent resistor (VDR) is a kind of voltage sensitive element utilizing the nonlinear wind vibration of semiconductor material and make.When impressed voltage is lower, the electric current flowing through resistance is very little, and voltage dependent resistor (VDR) is high-impedance state; When impressed voltage meets or exceeds pressure sensitive voltage, voltage dependent resistor (VDR) resistance sharply declines and conducting rapidly, and its working current can increase several order of magnitude, thus other elements effectively protected in circuit can not damage because of overvoltage.Namely the first clamp control circuit described in the present embodiment make use of the characteristic of described voltage dependent resistor (VDR), carries out clamp control to pretreated described ac signal, with by the voltage clamp of described ac signal to the second setting voltage.
As shown in Figure 2, described second clamp control circuit 22 comprises: the first unidirectional Transient Suppression Diode (Transient Voltage Suppressor is called for short TVS) pipe D1 and the second unidirectional TVS pipe D2.Wherein, the positive pole of described first unidirectional TVS pipe D1 is connected with the high pressure line end HV of described test line, and the negative pole of described first unidirectional TVS pipe D1 is connected with the negative pole of described second unidirectional TVS pipe D2.The positive pole of described second unidirectional TVS pipe D2 is connected with the earth terminal of described test line.
TVS pipe is a kind of high-effect protection device of diode form.When the two poles of the earth of TVS pipe receive reverse transient state high energy impact events, it can with 10
-20the speed of second-time, becomes Low ESR by the high impedance of its two interpolar, absorbs the surge power up to thousands of watts, makes the voltage clamp of two interpolars in a predetermined value, and the electrical equipment in effective protection electronic circuit is from the damage of various glitch voltage.Namely the second clamp control circuit described in the present embodiment make use of the characteristic of described TVS pipe; further clamp control is carried out to the ac signal that voltage is the second setting voltage; with by the voltage clamp of described ac signal to described first setting voltage; voltage by ac signal further reduces, to protect the electrical equipment in Subsequent electronic circuit from the damage of various glitch voltage further.
As shown in Figure 2, the converting unit 3 described in above-described embodiment comprises: the second resistance R5, the 3rd resistance R8, the first diode D3, the second diode D4 and the second electric capacity C2.Wherein, one end of described second resistance R5 is connected with the high pressure line end HV of described test line, and the other end of described second resistance R5 is connected with the DC signal input end VIN of described earthing detection unit.The negative electrode of the first diode D3 is connected with the DC signal input end VIN of described earthing detection unit, and the anode of described first diode D3 is connected with default high level VCC.The negative electrode of described second diode D4 is connected with the DC signal input end VIN of described earthing detection unit, the plus earth of described second diode D4.One end of second electric capacity C2 is connected with the DC signal input end VIN of described earthing detection unit, the other end ground connection of described second electric capacity C2.One end of 3rd resistance R8 is connected with the DC signal input end VIN of described earthing detection unit, and the other end of described 3rd resistance R8 is connected with described default high level VCC.Here you need to add is that: in above-mentioned converting unit realizing circuit, reliable for guaranteeing, avoid the electric current flowing through diode much, can Redundancy Design be adopted, one or two resistance of namely connecting again in circuit.Such as, the circuit shown in Fig. 3, connect two resistance R6 and R7 after the second resistance R5 again.
Concrete, described converting unit passes through the pull-up of the first diode D3 and the second diode D4 and drop-down effect, the ac signal being input to earthing detection unit is converted to the DC signal of 0 ~ 5V.The large valued resistor of connecting in the circuit that converting unit described in above-described embodiment realizes limits the electric current flowing through diode, also can not damage upper the first drop-down diode D3 and the second diode D4 when overtension.
Here it should be noted that: Fig. 2 and Fig. 3 illustrate only a kind of physical circuit implementation of Signal Pretreatment unit, clamp control module and converting unit, and the present invention is not limited to this, and each unit also can adopt other circuit realiration.
As shown in Figure 4, the earthing detection unit described in above-described embodiment comprises: power circuit 41, analog to digital converter 42 and processor 43.Wherein, described power circuit 41 is for providing working power for described analog to digital converter 42 and described processor 43.Described analog to digital converter 42 for the described DC signal received is converted to digital signal, and exports described digital signal to described processor 43.Described processor 43, for according to described digital signal, adopts the decision rule preset to judge whether test line exists ground connection.
Described processor can select 8-bit microprocessor.
Here you need to add is that: described default decision rule can generate based on existing earthing detection ultimate principle, namely according to described digital signal, calculate the impedance between test line and the earth, judge whether described impedance is greater than setting value, if be greater than, judge that test line does not exist ground connection, otherwise, judge that test line exists ground connection.
Further, the earthing detection equipment that above-described embodiment provides also comprises: alarm unit 5.As shown in Figure 5, described alarm unit is connected with described earthing detection unit 4, and particularly, described alarm unit is connected with the processor 43 of described earthing detection unit.Described earthing detection unit, also for when judging that described test line exists ground connection, generates controlling alarm instruction.The described controlling alarm instruction that described alarm unit 5 exports for receiving described earthing detection unit 4, and according to described controlling alarm instruction, perform corresponding alarm response.Wherein, described alarm unit can be hummer or alarm lamp.Such as, when after the controlling alarm instruction receiving the output of described earthing detection unit, hummer sends sound signal or alarm lamp sends light signal.
As shown in Figure 6, the schematic flow sheet of ground detecting method that provides of the embodiment of the present invention two.As shown in Figure 6, the executive agent of the method described in the present embodiment two can be the earthing detection equipment that above-described embodiment one provides, concrete, and the method described in the present embodiment two comprises:
Step 101, pre-service is carried out to the ac signal received, to eliminate the undesired signal in described ac signal.
Step 102, clamp control is carried out to pretreated described ac signal, with by the voltage clamp of described ac signal to the first setting voltage.
Particularly, this step can adopt twice clamp control realization by the voltage clamp of described ac signal to the first setting voltage, such as, comprise:
First, clamp control is carried out to pretreated described ac signal, with by the voltage clamp of described ac signal to the second setting voltage (as 1000VAC).
Then, clamp control is carried out to the ac signal that voltage is described second setting voltage, with by the voltage clamp of described ac signal to described first setting voltage (as 400VAC).
Step 103, be that the described ac signal of described first setting voltage is converted to DC signal by voltage.
The described DC signal that step 104, basis receive, adopts the decision rule preset to judge whether test line exists ground connection.
Particularly, this step can be adopted and be realized with the following method, comprising:
First, the described DC signal received is converted to digital signal.
Then, according to described digital signal, calculate the impedance between described test line and ground.
Finally, judge whether described impedance is greater than setting value, if be greater than, then judge that described test line does not exist ground connection; Otherwise, judge that described test line exists ground connection.
The ground detecting method that the present embodiment provides; by first eliminating the undesired signal in the AC signal that receives; when adopting clamp to control to occur the larger glitch voltage of energy on test line again, alternating current voltage is clamped to the electric pressure of setting; reliable protection can be provided for subsequent conditioning circuit, and then can damage from the impact of glitch voltage by effective protective ground checkout equipment.
Further, the method described in above-described embodiment two, also comprises:
If judge there is ground connection in described test line, then generate controlling alarm instruction, to make the alarm unit receiving described controlling alarm instruction, perform corresponding alarm response.
The above, it is only preferred embodiment of the present invention, not do any pro forma restriction to the present invention, any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. an earthing detection equipment, is characterized in that, comprising: the Signal Pretreatment unit connected successively, clamp control module, converting unit and earthing detection unit; Wherein,
Described Signal Pretreatment unit, for carrying out pre-service to the ac signal received, to eliminate the undesired signal in described ac signal;
Described clamp control module, for carrying out clamp control to pretreated described ac signal, with by the voltage clamp of described ac signal to the first setting voltage;
Described converting unit, for being that the described ac signal of described first setting voltage is converted to DC signal by voltage;
Described earthing detection unit, for according to the described DC signal received, adopts the decision rule preset to judge whether test line exists ground connection.
2. earthing detection equipment according to claim 1, is characterized in that, described Signal Pretreatment unit is RC filtering circuit, and described RC filtering circuit comprises: the first resistance and the first electric capacity, wherein,
One end of described first resistance is connected with the high pressure line end of described test line, and the other end of described first resistance is connected with one end of described first electric capacity;
The other end of described first electric capacity is connected with the earth terminal of described test line.
3. earthing detection equipment according to claim 1 and 2, is characterized in that, described clamp control module comprises: the first clamp control circuit connected successively and the second clamp control circuit, wherein,
Described first clamp control circuit, for carrying out clamp control to pretreated described ac signal, with by the voltage clamp of described ac signal to the second setting voltage;
Described second clamp control circuit, for being that the ac signal of described second setting voltage carries out clamp control to voltage, with by the voltage clamp of described ac signal to described first setting voltage;
Wherein, described first setting voltage is less than described second setting voltage.
4. earthing detection equipment according to claim 3, is characterized in that, described first clamp control circuit comprises: the first voltage dependent resistor (VDR) and the second voltage dependent resistor (VDR); Wherein,
Described first voltage dependent resistor (VDR) one end is connected with the high pressure line end of described test line, and the other end of described first voltage dependent resistor (VDR) is connected with one end of described second voltage dependent resistor (VDR);
The other end of described second voltage dependent resistor (VDR) is connected with the earth terminal of described test line.
5. earthing detection equipment according to claim 3, is characterized in that, described second clamp control circuit comprises: the first unidirectional Transient Suppression Diode TVS pipe and the second unidirectional TVS pipe; Wherein,
The described positive pole of the first unidirectional TVS pipe is connected with the high pressure line end of described test line, and the negative pole of described first unidirectional TVS pipe is connected with the negative pole of described second unidirectional TVS pipe;
The positive pole of described second unidirectional TVS pipe is connected with the earth terminal of described test line.
6. earthing detection equipment according to claim 1, is characterized in that, described converting unit comprises: the second resistance, the 3rd resistance, the first diode, the second diode and the second electric capacity, wherein,
One end of described second resistance is connected with the high pressure line end of described test line, and the other end of described second resistance is connected with the DC signal input end of described earthing detection unit;
The negative electrode of the first diode is connected with the DC signal input end of described earthing detection unit, and the anode of described first diode is connected with default high level;
The negative electrode of described second diode is connected with the DC signal input end of described earthing detection unit, the plus earth of described second diode;
One end of second electric capacity is connected with the DC signal input end of described earthing detection unit, the other end ground connection of described second electric capacity;
One end of 3rd resistance is connected with the DC signal input end of described earthing detection unit, and the other end of described 3rd resistance is connected with described default high level.
7. earthing detection equipment according to claim 4, is characterized in that, described earthing detection unit comprises: power circuit, analog to digital converter and processor; Wherein,
Described power circuit, for providing working power for described analog to digital converter and described processor;
Described analog to digital converter, for the described DC signal received is converted to digital signal, and exports described digital signal to described processor;
Described processor, for according to described digital signal, adopts the decision rule preset to judge whether test line exists ground connection, and generates corresponding control signal.
8. the earthing detection equipment according to claim 1 or 4, is characterized in that, also comprise: alarm unit;
Described earthing detection unit, also for when judging that described test line exists ground connection, generates controlling alarm instruction;
Described alarm unit, for receiving the described controlling alarm instruction that described earthing detection unit exports, and according to described controlling alarm instruction, performs corresponding alarm response.
9. a ground detecting method, is characterized in that, comprising:
Pre-service is carried out to the ac signal received, to eliminate the undesired signal in described ac signal;
Clamp control is carried out to pretreated described ac signal, with by the voltage clamp of described ac signal to the first setting voltage;
Be that the described ac signal of described first setting voltage is converted to DC signal by voltage;
According to the described DC signal received, the decision rule preset is adopted to judge whether test line exists ground connection.
10. ground detecting method according to claim 9, is characterized in that, the described DC signal that described basis receives, and adopts the decision rule preset to judge whether test line exists ground connection, and generates corresponding control signal, comprising:
The described DC signal received is converted to digital signal;
According to described digital signal, calculate the impedance between described test line and ground;
Judge whether described impedance is greater than setting value, if be greater than, then judge that described test line does not exist ground connection; Otherwise, judge that described test line exists ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728184.9A CN104749476A (en) | 2013-12-25 | 2013-12-25 | Grounding detection device and grounding detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728184.9A CN104749476A (en) | 2013-12-25 | 2013-12-25 | Grounding detection device and grounding detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104749476A true CN104749476A (en) | 2015-07-01 |
Family
ID=53589457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310728184.9A Pending CN104749476A (en) | 2013-12-25 | 2013-12-25 | Grounding detection device and grounding detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104749476A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| CN110192315A (en) * | 2017-01-12 | 2019-08-30 | 大陆-特韦斯贸易合伙股份公司及两合公司 | The electronic circuit of protection is provided for the power supply for reception device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5946179A (en) * | 1997-03-25 | 1999-08-31 | Square D Company | Electronically controlled circuit breaker with integrated latch tripping |
| CN1311441A (en) * | 2000-02-29 | 2001-09-05 | 万用计测器株式会社 | Method for testing earthing resistance |
| CN201289510Y (en) * | 2008-10-17 | 2009-08-12 | 孟雪 | Device for monitoring grounded screen operation |
| CN201388054Y (en) * | 2009-04-23 | 2010-01-20 | 上海市南供电设计有限公司 | Voltage and current conditioning device used for earth fault diagnosis of medium-voltage distribution network |
| CN202471873U (en) * | 2012-05-11 | 2012-10-03 | 滁州安瑞电力自动化有限公司 | DC system ground checking device |
| CN103376365A (en) * | 2012-04-28 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Impedance ground testing device and probe with same |
| CN204166072U (en) * | 2013-12-25 | 2015-02-18 | 国家电网公司 | Earthing detection equipment |
-
2013
- 2013-12-25 CN CN201310728184.9A patent/CN104749476A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5946179A (en) * | 1997-03-25 | 1999-08-31 | Square D Company | Electronically controlled circuit breaker with integrated latch tripping |
| CN1311441A (en) * | 2000-02-29 | 2001-09-05 | 万用计测器株式会社 | Method for testing earthing resistance |
| CN201289510Y (en) * | 2008-10-17 | 2009-08-12 | 孟雪 | Device for monitoring grounded screen operation |
| CN201388054Y (en) * | 2009-04-23 | 2010-01-20 | 上海市南供电设计有限公司 | Voltage and current conditioning device used for earth fault diagnosis of medium-voltage distribution network |
| CN103376365A (en) * | 2012-04-28 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Impedance ground testing device and probe with same |
| CN202471873U (en) * | 2012-05-11 | 2012-10-03 | 滁州安瑞电力自动化有限公司 | DC system ground checking device |
| CN204166072U (en) * | 2013-12-25 | 2015-02-18 | 国家电网公司 | Earthing detection equipment |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110192315A (en) * | 2017-01-12 | 2019-08-30 | 大陆-特韦斯贸易合伙股份公司及两合公司 | The electronic circuit of protection is provided for the power supply for reception device |
| US11050238B2 (en) | 2017-01-12 | 2021-06-29 | Continental Teves Ag & Co. Ohg | Electronic circuit for providing protection for an energy supply for a receiving device |
| CN110192315B (en) * | 2017-01-12 | 2022-01-21 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Electronic circuit for providing protection for power supply of receiving device |
| CN107607830A (en) * | 2017-09-13 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of electrical equipment protective grounding state continuous monitoring method |
| CN107607830B (en) * | 2017-09-13 | 2021-07-20 | 广西电网有限责任公司电力科学研究院 | Method for continuously monitoring protective grounding state of electrical equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103872667B (en) | A kind of Line Current Differential Protection method of the abnormal big number of anti-combining unit | |
| CN104218532A (en) | Voltage protection circuit for frequency converter direct current (DC) bus | |
| CN103901315A (en) | Monopole grounding system and device and method for grounding protection and fault monitoring | |
| CN204166072U (en) | Earthing detection equipment | |
| CN100468067C (en) | On-line monitor of lighting arrester | |
| CN206348391U (en) | A kind of earth resistance device | |
| CN105048428A (en) | Protective circuit for analog input ports | |
| CN204794059U (en) | Protection circuit of analog input port | |
| CN104749476A (en) | Grounding detection device and grounding detection method | |
| CN204696677U (en) | Exempt from ground connection surge protector | |
| CN203813421U (en) | Photovoltaic energy-storage inversion control integrated machine short-circuit and overload protecting circuit | |
| CN110112703A (en) | Protect circuit | |
| CN103592569A (en) | Extra-high voltage direct-current transmission line fault location method based on high frequency value attenuation characteristics | |
| CN203941243U (en) | A kind of three-phase electric power open phase testing circuit | |
| CN204391677U (en) | A kind of input voltage overvoltage crowbar | |
| CN216350976U (en) | Fault detection circuit, direct current power supply system and direct current equipment | |
| CN108279387A (en) | A kind of apparatus for monitoring power supply | |
| CN204089173U (en) | A kind of frequency changer direct current bus voltage protection circuit | |
| CN207817176U (en) | A kind of apparatus for monitoring power supply | |
| CN202997329U (en) | Lightning-protection power distribution cabinet | |
| CN102931592A (en) | Lightning-protection power distribution cabinet | |
| CN207782421U (en) | A kind of thyristor forced-triggered module being used for reactive-load compensation and filtering system | |
| CN106026016B (en) | A kind of capacitance-resistance step down type undervoltage tripping protection circuit | |
| CN110474290A (en) | A kind of protection circuit against input over-voltage that brief and practical can restore automatically | |
| CN104901168A (en) | Lightning arrester with counting function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150701 |
|
| RJ01 | Rejection of invention patent application after publication |