CN102840905A - Sensor monitoring and detection system used on automatic rail weighbridge - Google Patents
Sensor monitoring and detection system used on automatic rail weighbridge Download PDFInfo
- Publication number
- CN102840905A CN102840905A CN2012103200848A CN201210320084A CN102840905A CN 102840905 A CN102840905 A CN 102840905A CN 2012103200848 A CN2012103200848 A CN 2012103200848A CN 201210320084 A CN201210320084 A CN 201210320084A CN 102840905 A CN102840905 A CN 102840905A
- Authority
- CN
- China
- Prior art keywords
- sensor
- inductance
- detection system
- vdr
- display device
- 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.)
- Granted
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a sensor monitoring and detection system used on an automatic rail weighbridge. The sensor monitoring and detection system comprises a sensor bridge, at least one sensor and a digital signal display device, wherein the at least one sensor is connected with the sensor bridge through a respective bridge lightning-proof unit; the at least one sensor is connected with the digital signal display device through a respective signal lightning-proof unit; and the digital signal display device is provided with a sensor signal input terminal and a corresponding sensor signal output terminal. Since the sensor monitoring and detection system used on the automatic rail weighbridge is used, the operation in an installation and debugging or maintenance and debugging process of the sensor is relatively simple, the accuracy of the installation and debugging or the maintenance and debugging of the sensor is improved, and in addition, the sensor monitoring and detection system has a lightning-proof function.
Description
Technical field
The present invention relates generally to the equipment of monitoring, detecting to the duty of the sensor in the automatic scale, specifically, the present invention relates to a kind of sensor monitoring, detection system that is used on the automatic scale.
Background technology
Automatic scale is the metering outfit that railway transport vehicle is weighed.The sensor that is used for automatic scale mainly is divided into two kinds of pressure transducer and shear force sensors.In practical application, adopt the mode of hardware or software that sensor signal is carried out parallel connection or stack usually.Because the output of sensor has only some millivolts usually, so this signal must pass through and amplify and process such as analog to digital conversion, could gathered, write down, handle and shown by opertaing device.In automatic scale, to finally on display terminal, showing, its process is a series process with regard to the generation of sensor signal, and therefore any link in this process breaks down, and all will cause total system normally to move.
The reason of fault generating in the analytic signal transmission course can be divided into: sensor fault, circuit connect fault, signal amplifies and the analog to digital conversion signal superimposed anomaly etc. that causes such as unusual.
Wherein sensor fault is installed unusual and the sensor damage by being divided into sensor; Circuit connects in the fault and comprises line short and virtual connection.Because sensor directly contacts with rail, so thunder and lightning or track circuit also can exert an influence even cause its damage sensor.Working sensor voltage negative pole and signal amplify, the negative pole of analog to digital conversion circuit is an equipotential, and therefore when working sensor voltage received external interference, signal amplification, analog to digital conversion circuit were also with operation irregularity.
As shown in Figure 1, it is the synoptic diagram that the wiring of the sensor of prior art is arranged, wherein sensor supplies bridge to be used to the direct supply that sensor provides work, and this power supply is provided by data collecting instrument usually; Sensor signal 1-4 is the output signal of sensor 1-4, some millivolts d. c. voltage signal normally, and these voltage signals link to each other with data collecting instrument through transmission cable as the input signal of the data collecting instrument in the automatic scale.In practical application, can as required its output signal be carried out parallel connection.In addition, sensor is mounted in the weighing table on the rail track or below the circuit, and data collecting instrument or data presentation device are normally in the pulpit; Both are situation about often having at a distance of hundreds of rice; Therefore in Installation and Debugging or maintenance and debugging process, observe relatively difficulty of working sensor state, particularly in the Installation and Debugging process; Because the scene possibly also not have the installation data Acquisition Instrument, the duty of sensor is debugged difficulty more.Utilize the millivolt detection retaining of common multimeter to detect,, therefore detect and debug the working sensor state and can only lean on operating personnel's experience because its measuring accuracy is limited.
Summary of the invention
The purpose of this invention is to provide a kind of sensor monitoring, detection system that is used on the automatic scale; It can be so that simple relatively in the Installation and Debugging or the operation in the maintenance and debugging process of sensor; And make the Installation and Debugging of sensor or the precision of maintenance and debugging improve, have the function of anti-thunderbolt in addition.
For achieving the above object, the present invention provides a kind of sensor monitoring, detection system that is used on the automatic scale, and it comprises: sensor supplies bridge, at least one sensor and digital signal display device; Wherein, said at least one sensor supplies bridging to connect through confession bridge lightning protection unit and sensor separately, and the signal lighting protection unit that said at least one sensor passes through separately is connected with the digital signal display device; Said digital signal display device has sensor signal input terminal and corresponding sensor-signal lead-out terminal.
Above-mentioned sensor monitoring, the detection system that is used on the automatic scale, said signal lighting protection unit comprises signal lighting protection circuit, this signal lighting protection circuit comprises a ceramic gas discharge tube G1, two inductance L 1 and L2 and a solid discharging tube D1; Wherein, inductance L 1 is parallelly connected relation with inductance L 2; First end of ceramic gas discharge tube G1 is connected to first end of inductance L 1, and second end of ceramic gas discharge tube G1 is connected to first end of inductance L 2, and ceramic gas discharge tube G1 connects lightning protection grounding PE; First end of solid discharging tube D1 is connected to second end of inductance L 1, and second end of solid discharging tube D1 is connected to second end of inductance L 2.
Above-mentioned sensor monitoring, the detection system that is used on the automatic scale; Said confession bridge lightning protection unit comprises and supplies bridge lightning protection circuit, this confession bridge lightning protection circuit to include ceramic gas discharge tube and G2, four inductance L 3 to L6, solid discharging tube D1 and D2 and two voltage dependent resistor (VDR) M1 and M2; Wherein, be the parallel connection relation between the connecting of the series connection of inductance L 3 and inductance L 4 and inductance L 5 and inductance L 6; First end of ceramic gas discharge tube G2 is connected to first end of inductance L 3, and second end of ceramic gas discharge tube G2 is connected to first end of inductance L 5, and ceramic gas discharge tube G2 connects lightning protection grounding PE; First end of solid discharging tube D2 is connected to second end of inductance L 6, and second end of solid discharging tube D2 is connected to second end of inductance L 4; Be series connection between voltage dependent resistor (VDR) M1 and the voltage dependent resistor (VDR) M2; First end of voltage dependent resistor (VDR) M1 is connected between inductance L 3 and the inductance L 4; Second end of voltage dependent resistor (VDR) M1 is connected to first end of voltage dependent resistor (VDR) M2; Second end of voltage dependent resistor (VDR) M2 is connected between inductance L 5 and the inductance L 6, and first end of second end of voltage dependent resistor (VDR) M1 and voltage dependent resistor (VDR) M2 is connected lightning protection grounding PE.
Above-mentioned sensor monitoring, the detection system that is used on the automatic scale is respectively arranged with the connection switch between the adjacent sensor signal input terminal of said digital signal display device.
Above-mentioned sensor monitoring, the detection system that is used on the automatic scale, said digital signal display device is provided with the DC/DC power module.
Above-mentioned sensor monitoring, the detection system that is used on the automatic scale, said digital signal display device further is provided with independent current source.
Above-mentioned sensor monitoring, the detection system that is used on the automatic scale, said connection switch is a hand switch.
Above-mentioned sensor monitoring, the detection system that is used on the automatic scale, said connection switch is a motor operated switch.
Owing to take above technical scheme, the invention has the advantages that:
In system of the present invention, place, the two ends of sensor is provided with respectively and supplies bridge lightning protection unit and signal lighting protection unit, and this can effectively guarantee when other parts are struck by lightning, and avoids expensive sensor to damage; In addition; Even be that sensor itself is struck by lightning in some cases, because the signal lighting protection unit exists, the infringement of the opertaing device that also can prevent in the machine room data of sensor are gathered and sensor is controlled; As a rule, this opertaing device is more expensive.
The system of the application of the invention when sensor is installed and debugged, can use the digital signal display device that sensor is calibrated, and need as prior art, can not only lean on operating personnel's experience.In addition, the DC/DC power module provides the working power polluted of not having of isolation for the digital signal display device, so that the digital signal display device can work in the environment that does not receive external interference, thereby makes that the calibration of sensor is more accurate.
In system of the present invention, owing to be provided with the connection switch, through being operatively connected the switch signal of parallel sensor as required, this makes not only to the installation of sensor and debugs conveniently that even it is also more convenient to make the work of sensor use.
Description of drawings
Fig. 1 is the synoptic diagram that the wiring of the sensor of prior art is arranged.
Fig. 2 is for the sensor that is used on the automatic scale of the present invention is monitored, the synoptic diagram of an embodiment of detection system.
Fig. 3 is the circuit diagram of the lightning protection circuit among the present invention.
Embodiment
With reference to shown in Figure 2, it is for the sensor that is used on the automatic scale of the present invention is monitored, the synoptic diagram of an embodiment of detection system.
In this embodiment, the sensor monitoring, the detection system that are used on the automatic scale mainly comprise: sensor supplies bridge 50, four sensor 1-4 and digital signal display device 70.In the present embodiment, be to be that example describes, but it will be appreciated by persons skilled in the art that the present invention is not limited in use four sensors with four sensors, use one, two even six, eight sensors all to be fine.
In the present embodiment, sensor 1-4 supplies bridge 50 to be connected through confession bridge lightning protection unit 51-54 separately with sensor, and the signal lighting protection unit 61-64 that sensor 1-4 passes through separately is connected with digital signal display device 70; Said digital signal display device 70 has sensor signal input terminal 71-74 and corresponding sensor-signal lead-out terminal 75-78.Wherein, The quantity of the sensor signal input terminal of digital signal display device 70 can be corresponding with the quantity of sensor; For example, have four sensor 1-4 in the present embodiment, digital signal display device 70 can have four sensor signal input terminal 71-74 so.But; In other embodiment; The quantity of the sensor signal input terminal of digital signal display device 70 can be more than the quantity of sensor; For example the quantity of the sensor signal input terminal of digital signal display device 70 is eight, and when using four sensors, only need being connected to wherein, four sensor signal input terminals get final product.In addition, the quantity of sensor signal lead-out terminal is normally corresponding with the quantity of sensor signal input terminal, and when for example the quantity of sensor signal input terminal was eight, the quantity of sensor signal lead-out terminal also was eight; But the present invention also is not limited in this, and when for example the quantity of sensor signal input terminal was eight, the quantity of sensor signal lead-out terminal also can be four.
In exemplary embodiment of the present invention, be respectively arranged with the connection switch between the adjacent sensor signal input terminal of digital signal display device 70.Embodiment with four above-mentioned sensors is an example; Can be provided with between the adjacent sensor signal input terminal 71 and 72 and connect switch 12; Can be provided with between the adjacent sensor signal input terminal 72 and 73 and connect switch 23; Can be provided with between the adjacent sensor signal input terminal 73 and 74 and connect switch 34; Be provided with and connect switching purposes and be and can optionally be input to again in the digital signal display device 70 after the signal parallel connection with sensor, and at some to sensor use occasion and some to the sensor test occasion, it is needs very that the signal of sensor is carried out parallel connection.In addition, if be interpreted as that sensor signal input terminal 74 and sensor signal input terminal 71 also are adjacent, so also can be provided with connection switch (figure does not show) between them.
In addition, it will be appreciated by persons skilled in the art that above-mentioned connection switch can be hand switch, switch motion is carried out in its manual operation through operating personnel; Perhaps, above-mentioned connection switch also can be motor operated switch, and its control device commonly used by one of skill in the art carries out switch motion.
In exemplary embodiment of the present invention; Digital signal display device 70 is provided with DC/DC power module 79; This DC/DC power module 79 can supply bridge 50 to be connected with sensor, uses needed voltage thereby supply the voltage of bridge 50 to be adjusted into digital signal display device 70 sensor.In addition, it will be appreciated by persons skilled in the art that this DC/DC power module 79 can certainly be connected with other power supply, use needed voltage thereby it is adjusted into digital signal display device 70.
Further, digital signal display device 70 can also be provided with independent current source 80.This independently power supply 80 can for example be dry cell, accumulator or the like, it is mainly used in independently digital signal display apparatus 70 is supplied power.Like this, even there is not DC/DC power module 79, perhaps when DC/DC power module 79 can't normal power supply, digital signal display device 70 also can normally be used.
Below, cooperate with reference to shown in Figure 3, confession bridge lightning protection unit 51-54 of the present invention and signal lighting protection unit 61-64 are described in detail.
The confession bridge lightning protection unit 51-54 of invention and signal lighting protection unit 61-64 adopt two-stage or three grades of protection circuits; The first order will be invaded big of the big electric current high voltage of circuit and released into ground; Back level protection is carried out clamp step by step to the residual voltage of the first order; The thunder superpotential that lightning protection device is exported is lower than the withstand voltage level of equipment (system), has protected microelectronic device.The earth terminal of passage Surge Protector should link with machine room or lightning protection grounding nearby (PE), for induction lightening stream provides the path of releasing, constitutes the equipotential guard system simultaneously, and lightning protection grounding must not directly link with buildings lightning rod ground wire.
In one exemplary embodiment of the present invention; Signal lighting protection unit 61-64 comprises signal lighting protection circuit; Shown in the top among Fig. 3, this signal lighting protection circuit comprises a ceramic gas discharge tube G1, two inductance L 1 and L2 and a solid discharging tube D1; Wherein, inductance L 1 is parallelly connected relation with inductance L 2; First end of ceramic gas discharge tube G1 is connected to first end of inductance L 1, and second end of ceramic gas discharge tube G1 is connected to first end of inductance L 2, and ceramic gas discharge tube G1 connects lightning protection grounding PE; First end of solid discharging tube D1 is connected to second end of inductance L 1, and second end of solid discharging tube D1 is connected to second end of inductance L 2.
In one exemplary embodiment of the present invention; Supply bridge lightning protection unit 51-54 to comprise and supply the bridge lightning protection circuit; Shown in the lower part among Fig. 3, this confession bridge lightning protection circuit includes ceramic gas discharge tube and G2, four inductance L 3 to L6, solid discharging tube D2 and two voltage dependent resistor (VDR) M1 and M2; Wherein, be the parallel connection relation between the connecting of the series connection of inductance L 3 and inductance L 4 and inductance L 5 and inductance L 6; First end of ceramic gas discharge tube G2 is connected to first end of inductance L 3, and second end of ceramic gas discharge tube G2 is connected to first end of inductance L 5, and ceramic gas discharge tube G2 connects lightning protection grounding PE; First end of solid discharging tube D2 is connected to second end of inductance L 6, and second end of solid discharging tube D2 is connected to second end of inductance L 4; Be series connection between voltage dependent resistor (VDR) M1 and the voltage dependent resistor (VDR) M2; First end of voltage dependent resistor (VDR) M1 is connected between inductance L 3 and the inductance L 4; Second end of voltage dependent resistor (VDR) M1 is connected to first end of voltage dependent resistor (VDR) M2; Second end of voltage dependent resistor (VDR) M2 is connected between inductance L 5 and the inductance L 6, and first end of second end of voltage dependent resistor (VDR) M1 and voltage dependent resistor (VDR) M2 is connected lightning protection grounding PE.
According to lightning protection circuit shown in Figure 3; The concrete parameters of choice of each element in this lightning protection circuit is that those skilled in the art according to circumstances can adjust; This is need not pay creative work to those skilled in the art, therefore no longer concrete parameters of choice is carried out too much description at this.And according to a specific embodiment of invention, it is specific as follows that technology of the present invention can reach technical conditions:
Power supply
Nominal operation voltage: U
N=12V;
Impact deboost: input end is during with the simulation lightning wave impulse of 10/700 μ s, 5KV, and output terminal records deboost U
B≤60V;
Impact discharge capacity: the simulation lightning current wave with waveform 8/20 μ s impacts, and discharge capacity is greater than 5KA;
1. be suitable for speed: 9.6kbps;
2. insertion loss: maximum being suitable in the speed less than 0.5dB;
3. response time: less than 10ns;
4. work and storage requirement: working temperature :-40 ℃～+ 70 ℃, store :-10 ℃～+ 40 ℃, relative humidity are not more than 80%;
5. shell protection grade: GB4208-1993:IP20.
Signal
1. nominal operation voltage: U
N=5V;
2. impact deboost: input end is during with the simulation lightning wave impulse of 10/700 μ s, 5KV, and output terminal records deboost U
B≤10V;
3. impact discharge capacity: the simulation lightning current wave with waveform 8/20 μ s impacts, and discharge capacity is greater than 1.5KA;
4. be suitable for speed: 9.6kbps;
5. insertion loss: maximum being suitable in the speed less than 0.5dB;
6. response time: less than 10ns;
7. work and storage requirement: working temperature :-40 ℃～+ 70 ℃, store :-10 ℃～+ 40 ℃, relative humidity are not more than 80%;
8. shell protection grade: GB4208-1993:IP20.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (9)
1. sensor monitoring, a detection system that is used on the automatic scale is characterized in that it comprises: sensor confession bridge, at least one sensor and digital signal display device;
Wherein, said at least one sensor supplies bridging to connect through confession bridge lightning protection unit and sensor separately, and the signal lighting protection unit that said at least one sensor passes through separately is connected with the digital signal display device;
Said digital signal display device has sensor signal input terminal and corresponding sensor-signal lead-out terminal.
2. sensor monitoring, the detection system that is used on the automatic scale according to claim 1; It is characterized in that; Said signal lighting protection unit comprises signal lighting protection circuit, and this signal lighting protection circuit comprises a ceramic gas discharge tube G1, two inductance L 1 and L2 and a solid discharging tube D1;
Wherein, inductance L 1 is parallelly connected relation with inductance L 2; First end of ceramic gas discharge tube G1 is connected to first end of inductance L 1, and second end of ceramic gas discharge tube G1 is connected to first end of inductance L 2, and ceramic gas discharge tube G1 connects lightning protection grounding PE; First end of solid discharging tube D1 is connected to second end of inductance L 1, and second end of solid discharging tube D1 is connected to second end of inductance L 2.
3. sensor monitoring, the detection system that is used on the automatic scale according to claim 1; It is characterized in that; Said confession bridge lightning protection unit comprises and supplies bridge lightning protection circuit, this confession bridge lightning protection circuit to include ceramic gas discharge tube and G2, four inductance L 3 to L6, solid discharging tube D2 and two voltage dependent resistor (VDR) M1 and M2;
Wherein, be the parallel connection relation between the connecting of the series connection of inductance L 3 and inductance L 4 and inductance L 5 and inductance L 6; First end of ceramic gas discharge tube G2 is connected to first end of inductance L 3, and second end of ceramic gas discharge tube G2 is connected to first end of inductance L 5, and ceramic gas discharge tube G2 connects lightning protection grounding PE; First end of solid discharging tube D2 is connected to second end of inductance L 6, and second end of solid discharging tube D2 is connected to second end of inductance L 4; Be series connection between voltage dependent resistor (VDR) M1 and the voltage dependent resistor (VDR) M2; First end of voltage dependent resistor (VDR) M1 is connected between inductance L 3 and the inductance L 4; Second end of voltage dependent resistor (VDR) M1 is connected to first end of voltage dependent resistor (VDR) M2; Second end of voltage dependent resistor (VDR) M2 is connected between inductance L 5 and the inductance L 6, and first end of second end of voltage dependent resistor (VDR) M1 and voltage dependent resistor (VDR) M2 is connected lightning protection grounding PE.
4. according to any described sensor monitoring, the detection system that is used on the automatic scale of claim 1-3, it is characterized in that, be respectively arranged with the connection switch between the adjacent sensor signal input terminal of said digital signal display device.
5. according to any described sensor monitoring, the detection system that is used on the automatic scale of claim 1-3, it is characterized in that said digital signal display device is provided with the DC/DC power module.
6. sensor monitoring, the detection system that is used on the automatic scale according to claim 5 is characterized in that said digital signal display device further is provided with independent current source.
7. according to any described sensor monitoring, the detection system that is used on the automatic scale of claim 1-3, it is characterized in that said digital signal display device is provided with independent current source.
8. sensor monitoring, the detection system that is used on the automatic scale according to claim 4 is characterized in that said connection switch is a hand switch.
9. sensor monitoring, the detection system that is used on the automatic scale according to claim 4 is characterized in that said connection switch is a motor operated switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210320084.8A CN102840905B (en) | 2012-08-31 | 2012-08-31 | Sensor monitoring and detection system used on automatic rail weighbridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210320084.8A CN102840905B (en) | 2012-08-31 | 2012-08-31 | Sensor monitoring and detection system used on automatic rail weighbridge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102840905A true CN102840905A (en) | 2012-12-26 |
| CN102840905B CN102840905B (en) | 2017-04-26 |
Family
ID=47368476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210320084.8A Expired - Fee Related CN102840905B (en) | 2012-08-31 | 2012-08-31 | Sensor monitoring and detection system used on automatic rail weighbridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102840905B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3917981A (en) * | 1973-06-07 | 1975-11-04 | Colt Ind Operating Corp | Scale lightning protection system |
| US4718507A (en) * | 1986-09-04 | 1988-01-12 | Clyde W. Howlett | Electronic scale and length measurement apparatus including a digital readout |
| CN1924529A (en) * | 2006-09-25 | 2007-03-07 | 北京东方瑞威科技发展有限公司 | Tri-mesa electronic rail weigher system and its data processing method |
| CN201044356Y (en) * | 2007-05-25 | 2008-04-02 | 北京东方瑞威科技发展有限公司 | Lightning protection system for railway truck scale and ultra-deflection load equipment |
| CN201868871U (en) * | 2010-11-19 | 2011-06-15 | 北京雷迅博成科技发展有限公司 | Special lightning arrester for rail weighbridge and over-loaded and unbalance-loaded apparatus |
| CN202885960U (en) * | 2012-08-31 | 2013-04-17 | 北京华横新技术开发公司 | Sensor monitoring and detection system for automatic rail weighbridge |
-
2012
- 2012-08-31 CN CN201210320084.8A patent/CN102840905B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3917981A (en) * | 1973-06-07 | 1975-11-04 | Colt Ind Operating Corp | Scale lightning protection system |
| US4718507A (en) * | 1986-09-04 | 1988-01-12 | Clyde W. Howlett | Electronic scale and length measurement apparatus including a digital readout |
| CN1924529A (en) * | 2006-09-25 | 2007-03-07 | 北京东方瑞威科技发展有限公司 | Tri-mesa electronic rail weigher system and its data processing method |
| CN201044356Y (en) * | 2007-05-25 | 2008-04-02 | 北京东方瑞威科技发展有限公司 | Lightning protection system for railway truck scale and ultra-deflection load equipment |
| CN201868871U (en) * | 2010-11-19 | 2011-06-15 | 北京雷迅博成科技发展有限公司 | Special lightning arrester for rail weighbridge and over-loaded and unbalance-loaded apparatus |
| CN202885960U (en) * | 2012-08-31 | 2013-04-17 | 北京华横新技术开发公司 | Sensor monitoring and detection system for automatic rail weighbridge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102840905B (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1872452B1 (en) | Power distribution system using solid state power controllers | |
| CN102545152A (en) | Intelligent surge protector monitoring system | |
| CN106249142A (en) | A kind of extra-high voltage switch intelligent device for measuring | |
| EP2822125B1 (en) | Protection apparatus and method of verifying operation thereof | |
| KR20190128908A (en) | Apparatus for diagnosing an operation status of a protective equipment for distribution line | |
| CN106226601A (en) | A kind of detection device of weak current automatization insulation resistance | |
| CN202885960U (en) | Sensor monitoring and detection system for automatic rail weighbridge | |
| KR100972004B1 (en) | Device for measuring leakage current of DC lightning arrester | |
| CN203249969U (en) | A lightning arrester having a ground resistance testing function | |
| CN107170188A (en) | A kind of adjustable acousto-optic alarming device and its application method for DCS system | |
| CN207396654U (en) | Distribution Zinc-Oxide Arrester acceptance test device | |
| CN102840905A (en) | Sensor monitoring and detection system used on automatic rail weighbridge | |
| CN202541351U (en) | Stray current control system for DC (direct current) traction power supply | |
| KR102634953B1 (en) | Portable test device for Surge protective device | |
| CN102570439A (en) | Built-in detection device of surge protector | |
| CN101595617B (en) | Device for protecting data lines against overvoltages | |
| CN203894361U (en) | Long-distance mutual inductor polarity tester | |
| CN108646128B (en) | Bridge rectifier high-temperature reverse-bias aging system | |
| CN113075482A (en) | Electric power instrument | |
| CN201903622U (en) | Voltage resistance tester | |
| CN205581269U (en) | Transformer substation relay protection exports detection device | |
| CN104764989A (en) | Thyristor pulse monitoring device | |
| CN200941111Y (en) | Neutral point resistance information detection recorder | |
| CN201413369Y (en) | Detection device for surge protective device | |
| CN107688144A (en) | A kind of cigarette mounted circuit board fault locator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170426 Termination date: 20170831 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |