CN103078404A - Intelligentized switch cabinet monitoring system and method - Google Patents
Intelligentized switch cabinet monitoring system and method Download PDFInfo
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- CN103078404A CN103078404A CN2012105938974A CN201210593897A CN103078404A CN 103078404 A CN103078404 A CN 103078404A CN 2012105938974 A CN2012105938974 A CN 2012105938974A CN 201210593897 A CN201210593897 A CN 201210593897A CN 103078404 A CN103078404 A CN 103078404A
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- divide
- shut brake
- circuit breaker
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Abstract
The invention provides an intelligentized switch cabinet monitoring system. The intelligentized switch cabinet monitoring system comprises a linear displacement sensor, a magnetic balance type hall current voltage sensor, an infrared video monitoring device, an acoustic surface wave temperature measuring device, an insulation monitoring device and a control system; the linear displacement sensor is connected with a movable contact insulating pull rod of a circuit breaker, the magnetic balance type hall current voltage sensor is connected with an opening and closing coil circuit of the circuit breaker, the infrared video monitoring device, the acoustic surface wave temperature measuring device and the insulation monitoring device are all arranged in the switch cabinet, the linear displacement sensor, the magnetic balance type hall current voltage sensor, the infrared video monitoring device, the acoustic surface wave temperature measuring device and the insulation monitoring device are all connected with the control system. The invention further provides an intelligentized switch cabinet monitoring method. According to the system and the method, the mechanical characteristic parameter of the circuit breaker in the switch cabinet, data of real-time image, temperature, insulation and the like of main devices in the switch cabinet can be accurately acquired in an online manner, and the control system can give an alarm in time when abnormal conditions are discovered.
Description
Technical field
The present invention relates to a kind of intelligent switchboard system monitoring system, and a kind of intelligent switchboard system monitoring method.
Background technology
At present, the intelligent degree of the traditional medium voltage switchgear equipment that uses in the electrical network is not high, even the switchgear of fraction has installed measure and control device additional, can only realize switch cubicle location status, current-voltage measurement, and can not realize the function such as mechanical property, insulating monitoring, temperature monitoring, video monitoring of switch, exist the class can only be by regular artificial detection means such as the new fault of hidden danger such as insulation reduction etc. for switch cubicle, this mode can not be predicted the state of equipment in real time, can waste again a large amount of manually, there is certain limitation in the development of intelligent grid.
The transducer of traditional measurement breaker trip adopts the angle sensor technology to realize more, angular transducer is for detection of the mechanical rotation angle, it is converted into signal of telecommunication output with mechanical rotation or angular displacement, has contactless, noiseless, high sensitivity, high duplication, approaches the unlimited characteristics such as life-span, high frequency response characteristic is good, ambient adaptability is strong of rotating; But only can measure the angle of final drive shaft when angular transducer is applied to the circuit breaker displacement measurement, can not reflect in real time the motion of circuit breaker three-phase contact, asynchronism that can not perception three-phase contact is not comprehensively complete to the stroke monitoring of circuit breaker.
Summary of the invention
Based on this, the invention provides a kind of intelligent switchboard system monitoring system and method, online data such as the realtime graphic of main devices, temperature, insulation in the mechanical property parameter of Obtaining Accurate circuit breaker in the switch cubicle and the switch cubicle are when unusual circumstance and alarm.
A kind of intelligent switchboard system monitoring system comprises linear displacement transducer, magnetic balance type Hall current voltage sensor, infrared video monitoring arrangement, surface acoustic wave temperature measuring equipment, insulation monitor, control system; Described linear displacement transducer is connected with the moving contact of breaker insulated tension pole, described magnetic balance type Hall current voltage sensor is connected with the divide-shut brake coil circuit of circuit breaker, described infrared video monitoring arrangement, described surface acoustic wave temperature measuring equipment and described insulation monitor all are installed in the described switch cubicle, and described linear displacement transducer, magnetic balance type Hall current voltage sensor, infrared video monitoring arrangement, surface acoustic wave temperature measuring equipment, insulation monitor all are connected with described control system;
Described control system is used for receiving the circuit breaker shift value of described linear displacement transducer collection, current value and magnitude of voltage, the video data of infrared video monitoring arrangement collection, the contact temperature value of surface acoustic wave temperature measuring equipment collection and the insulation data that insulation monitor gathers that magnetic balance type Hall current voltage sensor gathers, and described control system comprises computing module and alarm module;
Described computing module is used for according to described shift value and output current, calculates divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, the divide-shut brake coil current voltage effective value of circuit breaker;
Described alarm module is used for sending warning message when one of described divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value, contact temperature value, insulation data exceed predetermined threshold value.
A kind of intelligent switchboard system monitoring method comprises the steps:
By being connected to the shift value of the linear displacement transducer collection circuit breaker on the moving contact of breaker insulated tension pole;
Gather electric current and the voltage of circuit breaker by the magnetic balance type Hall current voltage sensor on the divide-shut brake coil circuit that is connected to circuit breaker;
By being installed in the video data in the infrared video monitoring arrangement collection switch cubicle in the switch cubicle;
By being installed in the temperature data in the surface acoustic wave temperature measuring equipment collection switch cubicle in the switch cubicle;
By being installed in the insulation data in the insulation monitor collection switch cubicle in the switch cubicle;
According to described shift value, electric current and voltage, calculate divide-shut brake stroke, divide-shut brake average speed, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, the divide-shut brake coil current voltage effective value of circuit breaker;
If when one of described divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value, contact temperature data, insulation data exceed predetermined threshold value, then send warning message.
Above-mentioned intelligent switchboard monitoring system and method, adopt linear displacement transducer to be connected with circuit breaker with magnetic balance type Hall current voltage sensor, can accurately collect the closing of circuit breaker/separating brake stroke, close/separating brake average speed, just close/opening velocity, the electric current and voltage of the breaker mechanic property parameter such as overtravel length, stroke total time and closing/sub-gate circuit and tank circuit; Adopt simultaneously infrared video monitoring arrangement, surface acoustic wave temperature measuring equipment, insulation monitor to realize the on-line monitoring to switch cubicle, by to the operating image of switch cubicle, temperature, the isoparametric Real-time Collection of insulation, in time understand the switchgear operation conditions, grasp its variation tendency, for the inspection and maintenance of equipment provides foundation.
Description of drawings
Fig. 1 is intelligent switchboard system monitoring system of the present invention structural representation in one embodiment.
Fig. 2 be among Fig. 1 during breaker open operation the time of coil current value change schematic diagram.
Fig. 3 is intelligent switchboard system monitoring method of the present invention schematic flow sheet in one embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiments of the present invention are not limited to this.
As shown in Figure 1, it is intelligent switchboard system monitoring system of the present invention structural representation in one embodiment, the switch cubicle monitoring system comprises switch cubicle 10, comprise circuit breaker 20 in the switch cubicle 10, also comprise linear displacement transducer 30(Linear Variable Differential Transformer, LVDT), magnetic balance type Hall current voltage sensor 40, infrared video monitoring arrangement 50, surface acoustic wave temperature measuring equipment 60, insulation monitor 70, control system 80;
Described linear displacement transducer 30 is connected with the moving contact of breaker insulated tension pole, described magnetic balance type Hall current voltage sensor 40 is connected with the divide-shut brake coil circuit of circuit breaker, described infrared video monitoring arrangement 50, described surface acoustic wave temperature measuring equipment 60 and described insulation monitor 70 all are installed in the switch cubicle 10, and described linear displacement transducer 30, magnetic balance type Hall current voltage sensor 40, infrared video monitoring arrangement 50, surface acoustic wave temperature measuring equipment 60, insulation monitor 70 all are connected with control system 80;
Described control system 80 is used for receiving the circuit breaker shift value of described linear displacement transducer collection, current value and magnitude of voltage, the video data of infrared video monitoring arrangement collection, the contact temperature value of surface acoustic wave temperature measuring equipment collection and the insulation data that insulation monitor gathers that magnetic balance type Hall current voltage sensor gathers, and described control system comprises computing module and alarm module;
Described computing module 801 is used for according to described shift value and output current, calculates divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, the divide-shut brake coil current voltage effective value of circuit breaker;
Described alarm module 802 is used for sending warning message when one of described divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value, contact temperature value, insulation data exceed predetermined threshold value.
In the present embodiment, by the linear displacement transducer 30 that is connected with the moving contact of breaker insulated tension pole, can collect the shift value of circuit breaker 20, shift value is sent to control system 80, calculate on this basis breaker mechanic property; The straight line mechanical displacement that linear displacement transducer 30 gathers is convertible into the signal output that direct-reading shows, make things convenient for image data, product itself and the fricton-tight contact of testee, guarantee the useful life of transducer, linear displacement transducer 30 precision are high, wiring is simple and direct, antijamming capability is strong, the straight-line displacement sensing technology has been realized the respectively displacement of three contact of breaker of synchro measure, measures directly, and the intermediate conversion error is little; Linear displacement transducer 30 itself has following features simultaneously:
1. without rub measurement
Usually do not have the entity contact between the movable core of LVDT and the coil, that is to say that LVDT is the parts that do not have friction; It is used to bear lightweight iron core load, but the important measurement that can't bear friction load;
2. unlimited mechanical endurance
Owing to not having between the coil of LVDT and the iron core thereof to rub and contact, therefore can not produce any wearing and tearing.Like this, be endless in theory the mechanical endurance of LVDT;
3. unlimited resolution
LVDT makes it possess two significant characteristics without friction running and principle of induction thereof; First characteristic is to have real unlimited resolution.This means that LVDT can respond and generates output the most small motion of iron core.
In the present embodiment, also comprise magnetic balance type Hall current voltage sensor 40, magnetic balance type Hall current voltage sensor 40 is used for gathering electric current, the voltage of circuit breaker 20, therefore can monitor electric current and the magnitude of voltage in circuit breaker 20 divide-shut brake loops, magnetic balance type Hall current voltage sensor 30 can measure various waveform electric currents and magnitude of voltage and precision is high, the response time is short, temperature float little, nonlinearity good, can accurately kinetic current, the variation of voltage.
In the present embodiment, also comprise infrared video monitoring arrangement 50, described infrared video device is installed in the switch cubicle, is connected with described control system 80, and infrared video monitoring arrangement 50 is used for monitoring the real image situation in the switch cubicle; Native system can arrange 3 road infrared videos probe, respectively the situation of real time monitoring switch cubicle inner breaker chamber, bus-bar room, cable vault's relevant device.
In the present embodiment, also comprise SAW (Surface Acoustic Wave) device 60, described SAW (Surface Acoustic Wave) device 60 is installed in the switch cubicle 10, is connected with described control system 80; Gather the information of external temperature sensor by SAW (Surface Acoustic Wave) device 60, the temperature conditions of the main contact of Real-Time Monitoring, and can draw the temperature curve of tested contact by control system 80, and can provide the temperature anomaly early warning.
What the thermometric of traditional switchgear generally adopted is contactless infrared temperature-test technology, and it has fast, noncontact and can survey the characteristics of little target, and the application in the middle of industry field is more and more extensive.When by the infrared radiation thermometer thermometric, the infrared energy that testee is launched, optical system by infrared radiation thermometer is converted to the signal of telecommunication at detector, the temperature reading of this signal shows, the key factor that several decision accurate temperature measurements are arranged, most important factor are emissivity, visual field, the distance that arrives hot spot and the position of hot spot.But it is larger that the Non-contact Infrared Temperature Measurement technology is affected by the outward appearance, color, dirt of testee etc. when temperature survey, has larger measuring uncertainty, and be subject to the switch cabinet structure impact during Non-contact Infrared Temperature Measurement installation of sensors, is not easy to install.
And the external temperature sensor of native system adopts the surface acoustic wave thermometry, the basic principle of SAW (Surface Acoustic Wave) device (SAW) is to make the interdigital electrode (interdigital transducer) that is comprised of cross one another electrode by the method for photoetching on piezoelectric base unit, utilize the piezoelectric effect of substrate to excite the surfacewise high-frequency ultrasonic of Es-region propagations, thereby realize the multiple electronics functions such as filtering, time-delay, pulse compression and expansion, convolution.The characteristics such as surface acoustic wave techniques has wireless and passive, long-life, non-maintaining, volume is little, flexible for installation, noncontact.
In the present embodiment, also comprise insulation monitoring device 70, described insulation monitor 70 is installed in the switch cubicle, is connected with described control system 80; By the insulation situation of main insulating device in the insulation monitor 70 Real-Time Monitoring switch cubicles, and can draw the insulation curve that is monitored a little by control system 80, and can provide the Abnormal Insulation early warning.
The shift value of the circuit breaker 20 that gathers by linear displacement transducer 30 can calculate and obtain the breaker mechanic property parameter, comprising: 1. close/the separating brake stroke; 2. close/separating brake average speed; 3. just close/separating brake average speed; 4. contact open distance; 5. stroke total time; 6. overtravel length etc.;
The following meaning of having expressed above-mentioned part breaker mechanic property parameter:
| Parameter | Definition | Expression formula |
| Clearance between open contacts | During combined floodgate, distance between dynamic/static contact | s=s3 |
| Total kilometres | The dynamic/static contact initial position is to the total displacement of final position | s=s2 |
| Overtravel | Dynamic/static contact begins contact to the displacement between end of closing a floodgate | s=s2-s3 |
| Firm sum velocity | Dynamic/static contact rigidly connects the speed when touching during combined floodgate | v=s3/t1 |
| Closing speed | The speed of dynamic/static contact in the combined floodgate overall process | v=s2/t2 |
The output current of the circuit breaker 20 that gathers according to magnetic balance type Hall current voltage sensor 30, according to electric current and time relationship, but the operating condition of Real-Time Monitoring circuit breaker 20 divide-shut brake coils; The time of coil current value changes schematic diagram when as shown in Figure 2, being circuit breaker 20 separating brake.
Result of calculation according to computing module 801, alarm module 802 sends warning message when one of described divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current effective value exceed predetermined threshold value, realize the monitoring to switch cubicle.
In a preferred embodiment, described control system 80 also be provided with GPS to the time device, can accept GPS to the time pulse, guarantee that system time and gps time are synchronous.
Accordingly, as shown in Figure 3, the present invention also provides a kind of switch cubicle monitoring method, comprises the steps:
S11, gather the shift value of circuit breaker by being connected to linear displacement transducer on the moving contact of breaker insulated tension pole;
S12, gather the output current of circuit breaker by the magnetic balance type Hall current sensor on the divide-shut brake coil circuit that is connected to circuit breaker;
S13, gather video data in the switch cubicle by being installed in infrared video monitoring arrangement in the switch cubicle;
S14, gather contact temperature data in the switch cubicle by being installed in surface acoustic wave temperature measuring equipment in the switch cubicle;
S15, gather insulation data in the switch cubicle by being installed in insulation monitor in the switch cubicle;
S16, according to described shift value, electric current and voltage, calculate circuit breaker divide-shut brake stroke, divide-shut brake average speed, just close/opening velocity, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value;
If the described divide-shut brake stroke of S17, divide-shut brake average speed, just close/opening velocity, when one of clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value, contact temperature data, insulation data exceed predetermined threshold value, then send warning message;
In the present embodiment, linear displacement transducer is installed on the moving contact insulated tension pole of circuit breaker, magnetic balance type Hall current sensor is installed on the divide-shut brake coil circuit of circuit breaker, gathers the mechanical property parameter of circuit breaker by linear displacement transducer and magnetic balance type Hall current sensor; The linear displacement transducer antijamming capability is strong, and the parameters precision of collection is very high; And the corresponding time of magnetic balance type Hall current sensor is short, and the waveform current precision of measurement is high, variation that can accurately kinetic current; After collecting shift value, electric current and voltage, calculate circuit breaker 20 divide-shut brake stroke, divide-shut brake average speed, just close/opening velocity, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value, if can realize again simultaneously the monitoring of voltage switchgear screen, contact temperature supervision, insulating monitoring wherein a certain parameter exceed predetermined threshold value and then send warning message, the on-line monitoring of realization switch cubicle.
Switch cubicle monitoring system provided by the invention and method, adopt linear displacement transducer to be connected with circuit breaker with magnetic balance type Hall current sensor, can accurately collect the closing of circuit breaker/separating brake stroke, close/separating brake average speed, just close/opening velocity, the electric current and voltage of the breaker mechanic property parameter such as overtravel length, stroke total time and closing/sub-gate circuit and tank circuit; Energy and alarm when parameters surpasses predetermined threshold value; Can realize again simultaneously the monitoring of voltage switchgear screen, contact temperature supervision, insulating monitoring, device alarm, GPS to the time, multichannel 485 communications etc., by the Real-time Collection to switch cubicle parameter in service, in time understand the switchgear operation conditions, grasp its variation tendency, for the inspection and maintenance of equipment provides foundation.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (4)
1. intelligent switchboard system monitoring system, switch cubicle comprises circuit breaker, it is characterized in that, comprise linear displacement transducer, magnetic balance type Hall current voltage sensor, infrared video monitoring arrangement, surface acoustic wave temperature measuring equipment, insulation monitor, control system;
Described linear displacement transducer is connected with the moving contact of breaker insulated tension pole, described magnetic balance type Hall current voltage sensor is connected with the divide-shut brake coil circuit of circuit breaker, described infrared video monitoring arrangement, described surface acoustic wave temperature measuring equipment and described insulation monitor all are installed in the described switch cubicle, and described linear displacement transducer, magnetic balance type Hall current voltage sensor, infrared video monitoring arrangement, surface acoustic wave temperature measuring equipment, insulation monitor all are connected with described control system;
Described control system is used for receiving the circuit breaker shift value of described linear displacement transducer collection, current value and magnitude of voltage, the video data of infrared video monitoring arrangement collection, the contact temperature value of surface acoustic wave temperature measuring equipment collection and the insulation data that insulation monitor gathers that magnetic balance type Hall current voltage sensor gathers, and described control system comprises computing module and alarm module;
Described computing module is used for according to described shift value and output current, calculates divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, the divide-shut brake coil current voltage effective value of circuit breaker;
Described alarm module is used for sending warning message when one of described divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value, contact temperature value, insulation data exceed predetermined threshold value.
2. switch cubicle monitoring system according to claim 1 is characterized in that, described control system also be provided with GPS to the time device.
3. switch cubicle monitoring system according to claim 1, it is characterized in that, described linear displacement transducer, magnetic balance type Hall current voltage sensor, infrared video monitoring arrangement, surface acoustic wave temperature measuring equipment are connected with insulation monitor and are passed through 485 communication buses and be connected with described control system.
4. an intelligent switchboard system monitoring method is characterized in that, comprises the steps:
By being connected to the shift value of the linear displacement transducer collection circuit breaker on the moving contact of breaker insulated tension pole;
Gather electric current and the voltage of circuit breaker by the magnetic balance type Hall current voltage sensor on the divide-shut brake coil circuit that is connected to circuit breaker;
By being installed in the video data in the infrared video monitoring arrangement collection switch cubicle in the switch cubicle;
By being installed in the contact temperature data in the surface acoustic wave temperature measuring equipment collection switch cubicle in the switch cubicle;
By being installed in the insulation data in the insulation monitor collection switch cubicle in the switch cubicle;
According to described shift value, electric current and voltage, calculate divide-shut brake stroke, divide-shut brake average speed, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, the divide-shut brake coil current voltage effective value of circuit breaker;
If when one of described divide-shut brake stroke, divide-shut brake average speed, clearance between open contacts, stroke total time, overtravel length, divide-shut brake coil current voltage effective value, contact temperature data, insulation data exceed predetermined threshold value, then send warning message.
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| CN103364030A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Ring main unit characteristic on-line monitoring system |
| CN103487748A (en) * | 2013-09-05 | 2014-01-01 | 许昌学院 | Method for calculating switching-off and switching-on time of breaker and stroke of moving contact of breaker |
| CN103713216A (en) * | 2013-12-25 | 2014-04-09 | 深圳供电局有限公司 | Intelligent on-line monitoring device of medium voltage switchgear |
| CN103852108A (en) * | 2013-09-25 | 2014-06-11 | 人民电器集团上海有限公司 | Power transmission and transformation device adopting remote star network monitoring system |
| CN104502759A (en) * | 2014-12-19 | 2015-04-08 | 国家电网公司 | Intelligent monitoring system of distribution network switch cabinet |
| CN104569641A (en) * | 2013-10-14 | 2015-04-29 | 深圳大成智能电气科技有限公司 | Intelligent switch cabinet monitoring instrument |
| CN105758465A (en) * | 2016-04-29 | 2016-07-13 | 句容华源电器设备有限公司 | Monitoring system for working state of vacuum circuit breaker |
| CN105866587A (en) * | 2016-05-04 | 2016-08-17 | 国网江苏省电力公司电力科学研究院 | Monitoring system for condition of electric power switch cabinet |
| CN106291351A (en) * | 2016-09-20 | 2017-01-04 | 西安工程大学 | Primary cut-out fault detection method based on convolutional neural networks algorithm |
| CN108471519A (en) * | 2018-03-21 | 2018-08-31 | 国家电网公司 | A kind of KYN28-12 types switch cabinet contact tape electricity visual detection device |
| CN111610467A (en) * | 2020-05-19 | 2020-09-01 | 上海舒盈科技股份有限公司 | Switch cabinet capable of automatically detecting contact engagement state and detection method thereof |
| CN113203945A (en) * | 2021-04-26 | 2021-08-03 | 深圳供电局有限公司 | Circuit breaker energy storage loop fault judgment method and fault recorder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103364030A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Ring main unit characteristic on-line monitoring system |
| CN103487748A (en) * | 2013-09-05 | 2014-01-01 | 许昌学院 | Method for calculating switching-off and switching-on time of breaker and stroke of moving contact of breaker |
| CN103852108A (en) * | 2013-09-25 | 2014-06-11 | 人民电器集团上海有限公司 | Power transmission and transformation device adopting remote star network monitoring system |
| CN104569641A (en) * | 2013-10-14 | 2015-04-29 | 深圳大成智能电气科技有限公司 | Intelligent switch cabinet monitoring instrument |
| CN103713216A (en) * | 2013-12-25 | 2014-04-09 | 深圳供电局有限公司 | Intelligent on-line monitoring device of medium voltage switchgear |
| CN104502759A (en) * | 2014-12-19 | 2015-04-08 | 国家电网公司 | Intelligent monitoring system of distribution network switch cabinet |
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| CN105866587A (en) * | 2016-05-04 | 2016-08-17 | 国网江苏省电力公司电力科学研究院 | Monitoring system for condition of electric power switch cabinet |
| CN106291351A (en) * | 2016-09-20 | 2017-01-04 | 西安工程大学 | Primary cut-out fault detection method based on convolutional neural networks algorithm |
| CN106291351B (en) * | 2016-09-20 | 2019-01-18 | 西安工程大学 | High-voltage circuitbreaker fault detection method based on convolutional neural networks algorithm |
| CN108471519A (en) * | 2018-03-21 | 2018-08-31 | 国家电网公司 | A kind of KYN28-12 types switch cabinet contact tape electricity visual detection device |
| CN111610467A (en) * | 2020-05-19 | 2020-09-01 | 上海舒盈科技股份有限公司 | Switch cabinet capable of automatically detecting contact engagement state and detection method thereof |
| CN113203945A (en) * | 2021-04-26 | 2021-08-03 | 深圳供电局有限公司 | Circuit breaker energy storage loop fault judgment method and fault recorder |
| CN113203945B (en) * | 2021-04-26 | 2023-02-03 | 深圳供电局有限公司 | Circuit breaker energy storage loop fault judgment method and fault recorder |
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Application publication date: 20130501 |