CN204166072U - Earthing detection equipment - Google Patents
Earthing detection equipment Download PDFInfo
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- CN204166072U CN204166072U CN201320865049.4U CN201320865049U CN204166072U CN 204166072 U CN204166072 U CN 204166072U CN 201320865049 U CN201320865049 U CN 201320865049U CN 204166072 U CN204166072 U CN 204166072U
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- 230000001052 transient effect Effects 0.000 claims description 6
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Abstract
The utility model provides a kind of earthing detection equipment.Described earthing detection equipment comprises: 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 technical scheme that the utility model provides can effectively be damaged from the impact of glitch voltage by protective ground checkout equipment.
Description
Technical field
The utility model relates to a kind of detection technique, particularly relates to a kind of earthing detection equipment.
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.
Utility model content
The utility model provides a kind of earthing detection equipment, damages from the impact of glitch voltage with proterctive equipment.
The purpose of this utility model and solve its technical matters and realize by the following technical solutions.
The utility model 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 purpose of this utility model and solve its technical matters and 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.
Preferably, aforesaid earthing detection equipment, wherein, described alarm unit is hummer or alarm lamp.
By technique scheme, the earthing detection equipment that the utility model provides at least has following advantages:
The earthing detection equipment that the utility model provides; 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 solutions of the utility model, in order to better understand technological means of the present utility model, 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 utility model.
Accompanying drawing explanation
A kind of structural representation realized of the earthing detection equipment that Fig. 1 provides for the utility model embodiment 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 utility model embodiment one;
In the earthing detection equipment that Fig. 3 provides for the utility model embodiment 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 utility model embodiment one;
The structural representation of the another kind realization of the earthing detection equipment that Fig. 5 provides for the utility model embodiment one;
The schematic flow sheet of the ground detecting method that Fig. 6 provides for the utility model embodiment two.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the structural representation of earthing detection equipment that provides of the utility model embodiment 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 utility model is not limited in 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 utility model embodiment 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 utility model, not any pro forma restriction is done to the utility model, the any simple modification done above embodiment according to technical spirit of the present utility model, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (9)
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. earthing detection equipment according to claim 8, is characterized in that, described alarm unit is hummer or alarm lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320865049.4U CN204166072U (en) | 2013-12-25 | 2013-12-25 | Earthing detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320865049.4U CN204166072U (en) | 2013-12-25 | 2013-12-25 | Earthing detection equipment |
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| CN204166072U true CN204166072U (en) | 2015-02-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749476A (en) * | 2013-12-25 | 2015-07-01 | 国家电网公司 | Grounding detection device and grounding detection method |
| CN107238776A (en) * | 2017-05-27 | 2017-10-10 | 国网河南省电力公司平顶山供电公司 | It is a kind of to prevent detection warning device of the transformer station with safety measure power transmission |
| CN108749579A (en) * | 2018-06-04 | 2018-11-06 | 北京新能源汽车股份有限公司 | A kind of ground self-checking method, apparatus, high-pressure system and the automobile of high-pressure system |
-
2013
- 2013-12-25 CN CN201320865049.4U patent/CN204166072U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749476A (en) * | 2013-12-25 | 2015-07-01 | 国家电网公司 | Grounding detection device and grounding detection method |
| CN107238776A (en) * | 2017-05-27 | 2017-10-10 | 国网河南省电力公司平顶山供电公司 | It is a kind of to prevent detection warning device of the transformer station with safety measure power transmission |
| CN108749579A (en) * | 2018-06-04 | 2018-11-06 | 北京新能源汽车股份有限公司 | A kind of ground self-checking method, apparatus, high-pressure system and the automobile of high-pressure system |
| CN108749579B (en) * | 2018-06-04 | 2020-07-24 | 北京新能源汽车股份有限公司 | Grounding self-inspection method and device for high-voltage system, high-voltage system and automobile |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150218 |
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| CX01 | Expiry of patent term |