CN102170106B - Security protection method under vehicle high-voltage power supply system - Google Patents
Security protection method under vehicle high-voltage power supply system Download PDFInfo
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- CN102170106B CN102170106B CN201110047920.5A CN201110047920A CN102170106B CN 102170106 B CN102170106 B CN 102170106B CN 201110047920 A CN201110047920 A CN 201110047920A CN 102170106 B CN102170106 B CN 102170106B
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Abstract
The invention relates to a security protection method under a vehicle high-voltage power supply system. The method is monitor processing protection of leakage current, and comprises the following steps: 1) a leakage current monitoring module, a discharging module and a control processing module are selected, the signal output end of the leakage current monitoring module is connected to the signal input end of the control processing module, the control output end of the control processing module is connected to the control input end of the discharging module; 2) when an electric shock accident occurs in the circuit, the total current value on the positive and negative buses is not zero, and the difference of the positive and the negative bus currents detected by a sensor is the value of the leakage current; 3) the control processing module calculates the difference of the leakage current to judge whether an acousto-optic alarm is sent out or not; 4) the control processing module controls the discharging module to consume the dangerous high-voltage power stored in the circuit in a manner of doing work via resistance heating. According to the security protection method, the leakage current and the circuit loop of the high-voltage bus are monitored in real time, and the control processing module cuts off the high-voltage loop within a predetermined time.
Description
Technical field
The present invention relates to guard method, specifically, relate to the method for security protection under the high direct voltage power supply system that can be applicable to vehicle.
Background technology
Vehicle electrical systems power supply system has experienced from 14 volts, 28 volts, ± 28 volts of low-voltage DC origin systems.The increase of power consumption equipment and the application of new technology cause the power output of power-supply system constantly to increase, and the shortcoming day of low-voltage, high-current supply power mode, the supply power voltage that improves power-supply system was imperative to show especially.Armored vehicle power-supply system changes to 270 volts of high-voltage direct current (DC) power systems and hybrid power source system at present, and high voltage supply system transforms to through engineering approaches from principle.The benefit that the higher supply power voltage of application brings on vehicle is apparent, but must first solve the problem of power supply safety.
In certain project, electrical system adopts high voltage supply system, and the supply power voltage of electric power system is 28V direct current and 270V direct current, with mixing out-put supply system, provides.Because adopted supply power voltage 270V is considerably beyond human safety voltage; therefore in the use procedure of the generator distribution system of 270VDC supply power voltage; to take special safeguard procedures to the situation of the threat to life safety that may occur in all reality, and answer 100% the situation that detects threat to life safety and protect.
Summary of the invention
Method for security protection under direct current supply system is mainly reflected in Machine Design and two aspects of electrical design, comprise structural design, leakage current monitoring module, electric current loop detection module, discharge module and control processing module, leakage current and the current loop of this method for security protection Real-Time Monitoring high voltage bus, once there is the value of leakage current, surpass the phenomenon that set point or current loop break down, control the time internal cutting off high tension loop that processing module is being set; After cut-off loop, discharge module has the function that the dangerous high pressure being stored in circuit is discharged.
Method for security protection under a kind of vehicle high voltage supply system provided by the invention, its improvements are that described method for security protection is that leakage current test is processed protection, comprises the following steps:
1) select leakage current monitoring module, discharge module and and control processing module, the signal output part of leakage current test module is connected to the signal input part of controlling processing module, the control output end of controlling processing module is connected to the control input end of discharge module;
2) when there is electric shock accidents in circuit, the electric current total value on positive and negative busbar is just non-vanishing, has produced leakage current, and the difference that transducer detects positive and negative busbar electric current is the value of leakage current;
3) value that control processing module detects according to transducer is calculated the difference of the leakage current before and after changing, and difference is no more than 30mA, does not illustrate human body is formed to the threat of getting an electric shock, and can use safely; If this difference surpasses 30mA, controlling processing module can be in the whole high tension loop of 0.2s internal cutting off, and sends sound and light alarm, avoids the generation of electric shock accidents;
4) control processing module controlled discharge module and consume being stored in the mode that the dangerous high voltage electric energy in circuit does work by resistance heating, be converted to heat energy and discharge.
Method for security protection under the provided by the invention first preferred vehicle high voltage supply system, described method for security protection is current loop troubleshooting protection, comprises the following steps:
1) select electric current loop detection module, discharge module and and control processing module, the signal output part of electric current loop detection module is connected to the signal input part of controlling processing module, the control output end of controlling processing module is connected to the control input end of discharge module.
2) whether detection streamer plug connects intactly, only has cable plug to connect intact load and just can give distribution;
3) electric current loop detection module Real-Time Monitoring cable plug connection status in the process of distribution, once detect, plug-loose is cut off the electricity supply immediately and controlling the prompting of processing module interface ejection fault alarm.
Method for security protection under the provided by the invention second preferred vehicle high voltage supply system, described leakage current monitoring module comprises high-voltage load, leakage current sensor, current sensor and test voltage device; The interface of described high-voltage load connects high pressure positive and negative busbar one end, and the other end of high pressure positive and negative busbar is connected with test voltage device and is connected by wire and switch, current sensor successively through leakage current sensor.
Method for security protection under the provided by the invention the 3rd preferred vehicle high voltage supply system, described electric current loop detection module comprises five core high-voltage cable sockets, five core high-voltage cable plugs and electric current loop detection line; Described five core high-voltage cable sockets and five core high-voltage cable plugs are corresponding, and described electric current loop detection line is realized closed or disconnects through five core high-voltage cable sockets and five core high-voltage cable plugs.
Method for security protection under the provided by the invention the 4th preferred vehicle high voltage supply system; described five core high-voltage cables are by the nested formation of cable; comprise the isolation strip being arranged in order from inside to outside, total screen, sheath and three separate cable; the periphery of three separate cable is equipped with power line insulator, between power line insulator and isolation strip, is provided with filling tape.
Method for security protection under the provided by the invention the 5th preferred vehicle high voltage supply system, described three separate cable, wherein two cables include power line conductor and power line insulator, and power line insulator is positioned at the periphery of power line conductor; Another cable comprises type shielding layer, isolation strip and three separate cable, each separate cable comprises holding wire conductor and holding wire insulator, holding wire insulator is positioned at the periphery of holding wire conductor, and holding wire conductor, holding wire insulator and type shielding layer are arranged in order from inside to outside.
Method for security protection under the provided by the invention the 6th preferred vehicle high voltage supply system; described control processing module is that signal is processed and control circuit board; comprise A/D interface, the detection of electric current loop on/off interface, CPU and discharge control signal and driver output interface thereof; described A/D interface connects the output signal of leakage current sensor; electric current loop on/off detects interface and connects electric current loop detection line, and the output interface of circuit board connects the control input end of electric discharge device.
Method for security protection under the provided by the invention the 7th preferred vehicle high voltage supply system, a described discharge module Wei Mei road load front end conductive discharge device in parallel.
Method for security protection under the provided by the invention the 8th preferred vehicle high voltage supply system; described conductive discharge device is the switch power resistor of connecting; this switch is controlled by control processing module, between the pin at these resistance two ends or lead-in wire and the housing of its heat radiation, will have sufficiently high insulation.
1, structural design
High-tension line connects five special-purpose core high-voltage cables of use and the special high-pressure electric connector matching with it, its structure comprises filling tape, power line, holding wire, screen, holding wire and power line are isolated respectively with screen, make high-tension cable and the high-tension connector of apparatus tension, wear-resistant, insulation, the characteristic such as high temperature resistant, soft.High-tension cable and each high-tension apparatus are all pointed out its purposes with word or symbol, comprise the points for attention of operation, and the cable protective sleeve of high pressure branch road is selected the color with distinct contrast with low pressure branch road, strengthen warning function.
2, leakage current monitoring module
Leakage current monitoring module adopts the size of leakage current sensor monitoring leakage current, high pressure positive and negative busbar is passed to leakage current sensor, when there is electric shock accidents in circuit, electric current total value on positive and negative busbar is just non-vanishing, produced leakage current, the difference that transducer can detect positive and negative busbar electric current is the value of leakage current namely.
The safe current that 30mA is human body is generally got by China, by safety curve, can be found out, the electric shock time is below 0.2s and more than 0.2s, electric current is differentiated greatly to the extent of injury of human body, the electric shock time is while surpassing 0.2s, fibrillating current value will sharply reduce, and to the extent of injury of human body, also can greatly strengthen.
But because equipment self has leakage current in various degree (high-tension apparatus self leakage current do not allow to surpass 30mA), even if there is in such cases leakage current in circuit, to human body, be also not injury; So under different operating modes, the leakage current value of 270VDC grid equipment self is different, so take the method for Real-Time Monitoring leakage current to monitor the value of leakage current, leakage current sensor detects the value of leakage current can directly pass to control processing module.When in circuit, load state is different, on high voltage bus, the leakage current value of equipment self also can be different because of the difference of load;
The value that control processing module detects according to transducer is calculated the difference of the leakage current before and after changing, as long as this difference is no more than 30mA, does not illustrate that human body being formed to electric shock threatens, and can use safely.If this difference surpasses 30mA, controlling processing module can be in the whole high tension loop of 0.2s internal cutting off, and sends sound and light alarm, avoids the generation of electric shock accidents.
This method adopts the excited signal of the direct stable output of single-chip microcomputer, excitatory to exciting circuit after circuit amplifies; Testing circuit, after shaping circuit is processed, is directly delivered to single-chip microcomputer sample port, by single-chip microcomputer, carries out Direct Sampling; and carry out after digital filtering processing, accurately computing time, greatly shortened detection time; meet the requirement of protective circuit, and control time enough is provided to rear class.
3, current loop detection module
The connection status of system Real-Time Monitoring loaded cable plug in the process of distribution is to guarantee safety utilization of electric power, by the connection status of indicator light indication cable plug.
Control processing module and when to load distribution, follow following principle: whether electric current loop detection module first detection streamer plug connects intactly, only has cable plug to connect intact load and just can give distribution; Next electric current loop detection module Real-Time Monitoring cable plug connection status in the process of distribution, once detect, plug-loose is cut off the electricity supply immediately and controlling the prompting of processing module interface ejection fault alarm.
4, discharge module
Some load under high voltage supply system is capacitive load, after device powers down, in the short time, still have accumulation at the positive and negative terminal of equipment, although now power-off still still has very large potential safety hazard, in order to address this problem, a Mei road load front end conductive discharge device in parallel is to reach the object of electric discharge.
Leakage current test is processed protection and is protected in conjunction with better effects if with current loop troubleshooting.
Compared with prior art, the method for security protection under a kind of vehicle high voltage supply system provided by the invention has the following advantages:
1, the special high-pressure electric connector that adopts special-purpose five core high-voltage cables in structure and match with it, high-tension cable adopts the distinct color with warning function, and the personnel that prevent remove unintentionally to contact high-tension cable, have guaranteed personnel's safety.
2, leakage current monitoring adopts single-chip microcomputer directly to control and Digital Signal Processing, has improved accuracy of detection, has shortened detection time, has guaranteed personnel's safety;
3, adopt the connection status of current detecting loop technique Real-Time Monitoring high-voltage load cable plug, have the function of plug-loose protection, the personnel of preventing get an electric shock, and guarantee its safety.
4, after high-voltage load power-off, adopt electric discharge device that the dangerous electric energy remaining in high tension loop is released, the personnel of preventing get an electric shock, and guarantee its safety.
Accompanying drawing explanation
Fig. 1: the leakage current monitoring module of the method for security protection under a kind of vehicle high voltage supply system provided by the invention, discharge module and and control processing module cooperation relation schematic diagram;
Fig. 2: the electric current loop detection module of the method for security protection under a kind of vehicle high voltage supply system provided by the invention, discharge module and and control processing module cooperation relation schematic diagram;
Fig. 3: five core high-voltage cable structure charts of the method for security protection under a kind of vehicle high voltage supply system provided by the invention;
Fig. 4: the leakage current monitoring module diagram of the method for security protection under a kind of vehicle high voltage supply system provided by the invention;
Fig. 5: the plug of the method for security protection under a kind of vehicle high voltage supply system provided by the invention connects intact (left side) and plug-loose (right side) schematic diagram;
Fig. 6: the leakage current test of the method for security protection under a kind of vehicle high voltage supply system provided by the invention and protection philosophy figure (left side), current loop detect and plug-loose protection philosophy figure (right side);
Fig. 7: electric discharge device and the load catenation principle figure of the method for security protection under a kind of vehicle high voltage supply system provided by the invention;
In figure: 1-filling tape; 2-power line conductor; 3-power line insulator; 4-holding wire conductor; 5-holding wire insulator; 6-type shielding layer; 7-isolation strip; The total screen of 8-; 9-sheath; A leakage current test and protection; B current loop detects and plug-loose protection.
Embodiment
By drawings and the specific embodiments, the method for security protection under a kind of vehicle high voltage supply system provided by the invention is done to further more detailed description below.
embodiment 1
Method for security protection under the vehicle high voltage supply system of the present embodiment, method for security protection is that leakage current test is processed protection, comprises the following steps:
1) select leakage current monitoring module, discharge module and and control processing module, the signal output part of leakage current test module is connected to the signal input part of controlling processing module, the control output end of controlling processing module is connected to the control input end of discharge module;
2) when there is electric shock accidents in circuit, the electric current total value on positive and negative busbar is just non-vanishing, has produced leakage current, and the difference that transducer detects positive and negative busbar electric current is the value of leakage current;
3) value that control processing module detects according to transducer is calculated the difference of the leakage current before and after changing, and difference is no more than 30mA, does not illustrate human body is formed to the threat of getting an electric shock, and can use safely; If this difference surpasses 30mA, controlling processing module can be in the whole high tension loop of 0.2s internal cutting off, and sends sound and light alarm, avoids the generation of electric shock accidents;
4) control processing module controlled discharge module and consume being stored in the mode that the dangerous high voltage electric energy in circuit does work by resistance heating, be converted to heat energy and discharge.
As Fig. 4, leakage current monitoring module comprises high-voltage load, leakage current sensor, current sensor and test voltage device; The interface of high-voltage load connects high pressure positive and negative busbar one end, and the other end of high pressure positive and negative busbar is connected with test voltage device and is connected by wire and switch, current sensor successively through leakage current sensor.
Controlling processing module is that signal is processed and control circuit board, comprise A/D interface, the detection of electric current loop on/off interface, CPU and discharge control signal and driver output interface thereof, A/D interface connects the output signal of leakage current sensor, electric current loop on/off detects interface and connects electric current loop detection line, and the output interface of circuit board connects the control input end of electric discharge device.
A discharge module Wei Mei road load front end conductive discharge device in parallel, conductive discharge device is the switch power resistor of connecting, this switch is controlled by control processing module, between the pin at these resistance two ends or lead-in wire and the housing of its heat radiation, will have sufficiently high insulation.
As shown in Fig. 1 and Fig. 6 (left side), leakage current monitoring module adopts the size of leakage current sensor monitoring high pressure power consumption equipment leakage current, high pressure positive and negative busbar is together passed to leakage current sensor, when there is electric shock accidents in circuit, current value algebraical sum on positive and negative busbar is just non-vanishing, produced leakage current, the difference that transducer detects positive and negative busbar electric current is the value of leakage current.To between the positive bus-bar and car body of power consumption equipment, apply test voltage U between negative busbar and car body, the corresponding electric current of current sensor measurement is I successively
+and I
-, according to Ohm's law, the insulation resistance R of positive bus-bar to car body
+=U/I
+, the insulation resistance R of positive bus-bar to car body
-=U/I
-.
As shown in Figure 1, the leakage current value that control processing module detects transducer and the leakage current value of the intrinsic existence of power consumption equipment compare, when difference between them is no more than 30mA, illustrate human body not to be formed to get an electric shock and threaten, can use safely, and control the prompting of processing module interface ejection electric leakage alarming; If this difference surpasses 30mA, control processing module by the power supply supply at the corresponding high pressure power consumption equipment of 0.2s internal cutting off, and send sound and light alarm, avoid the generation of electric shock accidents.
Control processing module according to the connection of two electric current loop detection lines and disconnection, as Fig. 6 (right side) first detection streamer plug whether connect intactly, only have cable plug to connect intact high pressure power consumption equipment and just can give distribution; Next Real-Time Monitoring cable plug connection status in the process of distribution, once the power supply supply that plug-loose cuts off corresponding high pressure power consumption equipment immediately detected, and controlling the prompting of processing module interface ejection fault alarm.
As Fig. 7, a discharge module Wei Mei road load front end conductive discharge device in parallel, conductive discharge device is the switch power resistor of connecting, the other end of switch connects high pressure positive bus-bar, the other end of resistance connects high pressure negative busbar, this switch is controlled by control processing module, between the pin at these resistance two ends (or lead-in wire) and the housing of its heat radiation, will have sufficiently high insulation.
Embodiment 2
Method for security protection under the vehicle high voltage supply system of the present embodiment, method for security protection is current loop troubleshooting protection, comprises the following steps:
1) select electric current loop detection module, discharge module and and control processing module, the signal output part of electric current loop detection module is connected to the signal input part of controlling processing module, the control output end of controlling processing module is connected to the control input end of discharge module.
2) whether detection streamer plug connects intactly, only has cable plug to connect intact load and just can give distribution;
3) electric current loop detection module Real-Time Monitoring cable plug connection status in the process of distribution, once detect, plug-loose is cut off the electricity supply immediately and controlling the prompting of processing module interface ejection fault alarm.
As Fig. 5, electric current loop detection module comprises five core high-voltage cable sockets, five core high-voltage cable plugs and electric current loop detection line; Described five core high-voltage cable sockets and five core high-voltage cable plugs are corresponding, and described electric current loop detection line is realized closed or disconnects through five core high-voltage cable sockets and five core high-voltage cable plugs.
As shown in Figure 3, five core high-voltage cables are by the nested formation of cable, comprise the isolation strip 7 being arranged in order from inside to outside, total screen 8, sheath 9 and three separate cable, the periphery of three separate cable is equipped with power line insulator 3, between power line insulator 3 and isolation strip 7, is provided with filling tape 1.
Three separate cable, wherein two cables include power line conductor 2 and power line insulator 3, and power line insulator 3 is positioned at the periphery of power line conductor 2; Another cable comprises type shielding layer 6, isolation strip 7 and three separate cable, each separate cable comprises holding wire conductor 4 and holding wire insulator 5, holding wire insulator 5 is positioned at the periphery of holding wire conductor 4, and holding wire conductor 4, holding wire insulator 5 and type shielding layer 6 are arranged in order from inside to outside.
As shown in Figure 5, plug is connected with socket when intact, and electric current loop detection line 1 and electric current loop detection line 2 are communicated with; When plug is not connected intact (being plug-loose) with socket, electric current loop detection line 1 and electric current loop detection line 2 disconnect.When cable plug connects, between power supply positive bus-bar-load-power-bus, just formed a complete current loop (abbreviation electric current loop), according to whether getting loose with cable plug electric current loop detection line 1 and being communicated with whether disconnection detection electric current loop is intact of electric current loop detection line.
As Fig. 1-2, controlling processing module is that signal is processed and control circuit board, comprise A/D interface, the detection of electric current loop on/off interface, CPU and discharge control signal and driver output interface thereof, A/D interface connects the output signal of leakage current sensor, electric current loop on/off detects interface and connects electric current loop detection line, and the output interface of circuit board connects the control input end of electric discharge device.
As Fig. 7, a discharge module Wei Mei road load front end conductive discharge device in parallel, a discharge module Wei Mei road load front end conductive discharge device in parallel, conductive discharge device is the switch power resistor of connecting, the other end of switch connects high pressure positive bus-bar, the other end of resistance connects high pressure negative busbar, and this switch is controlled by control processing module, between the pin at these resistance two ends (or lead-in wire) and the housing of its heat radiation, will have sufficiently high insulation.
Embodiment 3
Method for security protection under the vehicle high voltage supply system of the present embodiment is for to be combined with above-mentioned two kinds of methods.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although the present invention is had been described in detail with reference to above-described embodiment; those of ordinary skill in the field are to be understood that: technical staff still can modify or be equal to replacement the specific embodiment of the present invention after reading present specification, but these modifications or change all depart from the present patent application, do not await the reply within claim protection range.
Claims (5)
1. the method for security protection under vehicle high voltage supply system, is characterized in that described method for security protection is leakage current test place
Reason protection or current loop troubleshooting protection,
Described leakage current test is processed protection and is comprised the following steps:
1) select leakage current monitoring module, discharge module and and control processing module, the signal output part of leakage current monitoring module is connected to the signal input part of controlling processing module, the control output end of controlling processing module is connected to the control input end of discharge module;
2) when there is electric shock accidents in circuit, the electric current total value on positive and negative busbar is just non-vanishing, has produced leakage current, and the difference that transducer detects positive and negative busbar electric current is the value of leakage current;
3) value that control processing module detects according to transducer is calculated the difference of the leakage current before and after changing, and difference is no more than 30mA, does not illustrate human body is formed to the threat of getting an electric shock, and can use safely; If this difference surpasses 30mA, controlling processing module can be in the whole high tension loop of 0.2s internal cutting off, and sends sound and light alarm, avoids the generation of electric shock accidents;
4) controlling processing module controlled discharge module disappears being stored in the mode that the dangerous high voltage electric energy in circuit does work by resistance heating
Consume, be converted to heat energy and discharge;
Described control processing module is that signal is processed and control circuit board, comprise A/D interface, the detection of electric current loop on/off interface, CPU and discharge control signal and driver output interface thereof, described A/D interface connects the output signal of leakage current sensor, electric current loop on/off detects interface and connects electric current loop detection line, and the output interface of circuit board connects the control input end of discharge module;
Described current loop troubleshooting protection comprises the following steps:
1) select electric current loop detection module, discharge module and and control processing module, the signal output part of electric current loop detection module is connected to the signal input part of controlling processing module, the control output end of controlling processing module is connected to the control input end of discharge module;
2) whether detection streamer plug connects intactly, only has cable plug to connect intact load and just can give distribution;
3) electric current loop detection module Real-Time Monitoring cable plug connection status in the process of distribution, once detect, plug-loose is cut off the electricity supply immediately and controlling the prompting of processing module interface ejection fault alarm; Described electric current loop detection module comprises five core high-voltage cables, five core high-voltage cable sockets, five core high-voltage cable plugs and electric current loop detection line; Described five core high-voltage cable sockets and five core high-voltage cable plugs are corresponding, and described electric current loop detection line is realized closed or disconnects through five core high-voltage cable sockets and five core high-voltage cable plugs;
Described five core high-voltage cables are by the nested formation of cable, comprise the isolation strip (7) being arranged in order from outside to inside, total screen (8), sheath (9) and three separate cable, the periphery of three separate cable is equipped with power line insulator (3), between power line insulator (3) and isolation strip (7), is provided with filling tape (1).
2. the method for security protection under vehicle high voltage supply system according to claim 1, is characterized in that described leakage current monitoring module comprises high-voltage load, leakage current sensor, current sensor and test voltage device; The interface of described high-voltage load connects high pressure positive and negative busbar one end, and the other end of high pressure positive and negative busbar is connected with test voltage device and is connected with switch, current sensor successively by wire through leakage current sensor.
3. the method for security protection under vehicle high voltage supply system according to claim 1, it is characterized in that described three separate cable, wherein two cables include power line conductor (2) and power line insulator (3), and power line insulator (3) is positioned at the periphery of power line conductor (2); Another cable comprises type shielding layer (6), isolation strip (7) and three sub-separate cable, every sub-separate cable comprises holding wire conductor (4) and holding wire insulator (5), holding wire insulator (5) is positioned at the periphery of holding wire conductor (4), and holding wire conductor (4), holding wire insulator (5) and type shielding layer (6) are arranged in order from inside to outside.
4. the method for security protection under vehicle high voltage supply system according to claim 1, is characterized in that a described discharge module Wei Mei road load front end conductive discharge device in parallel.
5. the method for security protection under vehicle high voltage supply system according to claim 4; it is characterized in that described conductive discharge device is the switch power resistor of connecting; this switch is controlled by control processing module, between the pin at these resistance two ends or lead-in wire and the housing of its heat radiation, will have sufficiently high insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110047920.5A CN102170106B (en) | 2011-02-28 | 2011-02-28 | Security protection method under vehicle high-voltage power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110047920.5A CN102170106B (en) | 2011-02-28 | 2011-02-28 | Security protection method under vehicle high-voltage power supply system |
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| CN102170106A CN102170106A (en) | 2011-08-31 |
| CN102170106B true CN102170106B (en) | 2014-08-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103802763B (en) * | 2014-02-20 | 2015-12-30 | 中国北方车辆研究所 | A kind of armored vehicle high direct voltage big current combination power distribution protective device |
| CN105896526B (en) * | 2016-04-12 | 2019-07-23 | 上海斐讯数据通信技术有限公司 | Method for security protection, device and the cable of cable |
| CN108364722A (en) * | 2018-01-23 | 2018-08-03 | 安徽国通电力建设有限公司 | A kind of more cable insulated power cables |
| CN117543503B (en) * | 2023-11-13 | 2024-05-24 | 重庆电道智能科技有限公司 | Leakage protector |
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| CN201466674U (en) * | 2009-08-25 | 2010-05-12 | 王泽东 | Automatic protector for using electricity safely |
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| CN2301001Y (en) * | 1997-04-16 | 1998-12-16 | 连依得企业有限公司 | Plug capable of testing socket perfectness |
| JP2001320829A (en) * | 2000-05-10 | 2001-11-16 | Hitachi Medical Corp | Earth fault detector and medical diagnostic instrument therewith |
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- 2011-02-28 CN CN201110047920.5A patent/CN102170106B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| CN2577468Y (en) * | 2002-11-08 | 2003-10-01 | 擎宏电子企业有限公司 | Safety socket group with earth wire circuit plug detection |
| CN1744400A (en) * | 2004-09-02 | 2006-03-08 | 薛小平 | Intelligent leakage protector |
| CN201466674U (en) * | 2009-08-25 | 2010-05-12 | 王泽东 | Automatic protector for using electricity safely |
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