CN102508128A - Switch cabinet local discharge transient-to-ground voltage detection system based on wireless network - Google Patents
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Abstract
The invention relates to a switch cabinet local discharge transient-to-ground voltage detection system based on a wireless network, which is characterized in that: a signal collection unit is sequentially connected with a transient-to-ground voltage sensor, a filter circuit, an amplification circuit and an analog-to-digital conversion circuit in series, and an output end of the analog-to-digital conversion circuit is connected with a signal transmission unit; the signal transmission unit is provided with a general packet radio service (GPRS) transmitting device and a GPRS receiving device for receiving a signal transmitted by the GPRS transmitting device, a signal input end of the GPRS transmitting device is connected with the analog-to-digital conversion circuit of the signal collection unit, and an output end of the GPRS receiving device is connected with a data collection and analysis unit; the data collection and analysis unit adopts a computer or a high-speed digital signal processor (DSP) chip as a main processor; and a human-machine interface is used for displaying a detection result of the entire system. The switch cabinet local discharge transient-to-ground voltage detection system has high sensitivity of the sensors, can resist the interference, is safe, rapid and accurate to detect, is convenient for working personnel to operate and diagnose, and can realize the local discharge monitoring and location information collection of multiple parts inside a switch cabinet. Discharge fault can be discovered and eliminated in time.
Description
Technical Field
The invention relates to a local discharge transient voltage-to-ground voltage system of a switch cabinet, in particular to a wireless network-based local discharge transient voltage-to-ground voltage detection system of the switch cabinet, which can monitor the change state of the local discharge level in the running switch cabinet at any time through online TEV local discharge detection, transmit the change state to an upper computer through a wireless network and further describe the local discharge characteristics of the switch cabinet from multiple angles.
Background
The electric power is the most important technical basis for production development and social revolution, and with the rapid development of economy in China, the automatic construction and modification of the electric power industry, power supply and power utilization enterprises are continuously developed and perfected, the voltage grade of electric power equipment is continuously improved, and people put forward more rigorous requirements on the operation reliability of the electric power equipment.
The switch cabinet is an important electrical device in a power system, and the requirement of the modern power system on the quality of electric energy is higher and higher, and correspondingly, higher requirements on the reliability of the switch cabinet are also provided. The operating state of the switchgear has a significant influence on the reliability of the power system. When the switch cabinet breaks down, direct damage is to damage circuits and equipment protected by electrical equipment and loss of electric quantity; the indirect harm is large-area power failure of users. In order to ensure the reliability of power supply, the power department adopts a method of regular test and maintenance to ensure the normal operation of the switch cabinet. However, periodic maintenance increases the operating costs and blackout time of the power equipment, even increases the failure rate of the equipment, and failures occur at intervals of maintenance. Therefore, the state maintenance of the switch cabinet is urgently needed, the running state of the equipment is monitored on line in real time and regularly, the maintenance time and measures are determined according to the running state of the equipment and the degradation degree of the insulation, the power failure time and the occurrence of accidents are reduced, and the safety reliability and the automation degree of the running of the power system are improved. Meanwhile, with the development of sensor technology, signal processing technology, computer technology and artificial intelligence technology, the on-line monitoring of the operation state of the switch cabinet is realized, the fault hidden danger can be found in time, and the prediction of accumulative faults can be made.
To perform on-line detection on equipment for condition maintenance, the type and characteristics of a fault must be analyzed, so as to determine a monitored project. Because the switch cabinet is a combination of a plurality of electrical devices, the interior of the switch cabinet relates to various physical phenomena such as electricity, magnetism, temperature and the like, and the expression form and the generation mechanism of faults are different, the working characteristics and the fault characteristics of the switch cabinet must be known to perform online monitoring and make more accurate fault judgment and even fault prediction on the switch cabinet. The switchgear has a multiplicity of components, states and randomness and ambiguity of faults. The diversity of components, resulting in a diversity of failure modes, has a plurality of electrical components in the switch cabinet, and different components have different failure behaviors. For example, for a bus bar, a failure thereof appears as an excessive contact resistance at the connection, thereby causing an abnormal temperature rise; for insulated tie rods, the failure is manifested as a decrease in insulation performance. The variety of failure modes creates difficulties in the selection of sensors, and the type, performance, number, and mounting location of the selected sensors will be directly related to the diagnostic confidence. The diversity of the switch cabinet states means that the working states of the switch cabinets have great differences in different application occasions. For example, as for the circuit breakers, some circuit breakers need to be frequently switched on and off, and some circuit breakers hardly act after commissioning; some of them are required to cut off the short-circuit current for a plurality of times in the life span, and some of them are not required to be cut off at one time. This variability in operating conditions presents difficulties for on-line monitoring and fault diagnosis of circuit breakers. For example, the operation condition of the circuit breaker operating mechanism can be known through the stroke curve of the movable contact of the circuit breaker, but if the circuit breaker does not perform breaking closing action for a long time after being put into operation, the stroke curve cannot be obtained. The randomness and the fuzziness of the fault occurrence of the switch cabinet reflect that a complex time-varying nonlinear mapping relation exists between state variables and fault characteristic variables of the switch cabinet: the fault of the electrical equipment not only depends on the current state of the equipment, but also has a relation with the historical state of the equipment, namely, the same fault can be caused by a plurality of unrelated reasons, and the same reason can cause different faults; for the same status parameters, faults may or may not occur, and the severity of the faults may also vary.
The operating characteristics and the fault characteristics of the switch cabinet are comprehensively considered, and the main monitored items of the state overhaul of the switch cabinet comprise temperature monitoring, electric quantity monitoring, vibration monitoring, Partial discharge (PD-Partial discharge) monitoring and the like. The temperature monitoring, the electric quantity detection and the vibration monitoring are developed to the stage with comprehensive application and popularization and functions. Since the foreign 50 s, a great deal of research work has been carried out around the partial discharge monitoring technology, and various technologies have been successfully applied to partial discharge detection of transformers, which are neutral point coupling monitoring, radio frequency monitoring, PDA monitoring, and the like. And the research in the aspect of local discharge online monitoring in China starts late and develops slowly. Although a plurality of sets of partial discharge online monitoring systems are put into use at present, the theory is still imperfect, and a plurality of problems to be solved are also existed.
Defects or deterioration of the insulating part inside the switch cabinet and poor contact of the conductive connecting part all threaten safe operation. According to the accident statistics of 6-10 kV switch cabinets of the national power system between 1989 and 1992, the faults caused by insulation and current carrying account for 40.2 percent of the total number, wherein the accidents caused by flashover of the insulation part account for 79.0 percent of the total number of insulation accidents. And the accident caused by poor contact of the isolating plug accounts for 71.1 percent of the total number of current-carrying accidents. It can be seen that the percentage of failures due to insulation and contact failures is high and can be monitored by appropriate methods. Under the condition, many insulation defects are gradually developed, dielectric breakdown is finally formed, and the phenomena that partial discharge is continuously developed and enhanced can occur in the accident latency period, so that fault diagnosis is carried out by monitoring PD signals of the switch cabinet on line, and the method has important significance for preventing accidents and realizing state overhaul. Technically, the partial discharge on-line monitoring system developed in China at present can be divided into a narrow-band system and a wide-band system. The narrow-band system is only sensitive to the spark discharge with serious late partial discharge and can not distinguish the source of the discharge signal. In a broadband system, the wider the bandwidth, the richer the information of partial discharge collected, but the higher the requirements on the system are: on the one hand, higher sampling rates and digital processing capabilities are required, and on the other hand, discrimination of disturbances is also critical. The existing partial discharge monitoring system can not realize the precise positioning of the partial discharge source in the switch cabinet by adopting any method. The current partial discharge measurement and assessment criteria are only general evaluations of electrical equipment, the measured values of which are greatly affected by the location of the partial discharge source within the equipment. Only under the condition of the known partial discharge position, the overall evaluation of the equipment insulation has higher reliability and practical value, so that the accurate positioning of the partial discharge source is very important, and the method has important scientific significance and practical value for the research of the partial discharge positioning method.
At present, the positioning method of the partial discharge source mainly comprises an electrical positioning method, an ultrasonic positioning method and a radio frequency ultrasonic combined positioning method. These methods all have certain advantages, but theoretically, the multi-point positioning problem cannot be solved.
In addition, the existing local discharge positioning method, whether an electrical positioning method or an ultrasonic positioning method and a radio frequency ultrasonic combined positioning method, needs to transmit signals provided by each sensor to a data processing center through a corresponding wired cable. There are a number of disadvantages to using such wired sensors: firstly, because the number of monitoring points needing to be positioned in the switch cabinet is large, a plurality of sensors are required to be installed in the switch cabinet, a large number of cables are difficult to lead out, the wiring cost is increased, and the insulation damage of the switch cabinet can be caused; over time, part of sensors in the switch cabinet inevitably age or break down, which can cause loss of monitoring parameters; and thirdly, after a general monitoring system is designed, it is difficult to increase and adjust the sensors, and the change of the sensor configuration may require the modification of a system software source program. These disadvantages of wired sensors limit the development of switchgear condition monitoring.
TEV, also known as transient voltage to ground, was first proposed in 1974 by Dr John Reeves. When partial discharge occurs inside the non-closed metal shield, a large number of high-frequency electromagnetic wave pulses are generated by the discharge, the high-frequency electromagnetic waves propagate to the periphery along the inner surface of the metal shield due to the propagation characteristic of the high-frequency electromagnetic waves, and when the electromagnetic waves propagate to the gaps of the metal shield, the electromagnetic waves are transmitted out of the gaps and finally transmitted into the ground electrode through the grounding wire. When the high-frequency electromagnetic signal passes through the surface of the metal shield, a transient voltage value, namely a transient voltage to ground (TEV), is excited on the surface. It is found through research that such voltage signal has a direct relation with the intensity of the partial discharge in the metal shield and the position of the discharge. Therefore, whether or not there is a partial discharge in the switchgear can be determined by detecting this TEV signal.
GPRS is an abbreviation of General Packet Radio Service (General Packet Radio Service), is a Packet-switched data bearer and transmission mode developed on the basis of GSM global system for mobile communications (GSM) network, and is widely applied to embedded systems. With the increasing maturity of the construction of the China mobile GPRS network, the coverage rate of the area exceeds 90%, and the GPRS signal basically reaches the coverage without blind areas. GPRS belongs to packet switching technology, and has the characteristics of real-time online, charging according to flow, fast login, high transmission rate, support of IP protocol and X.25 protocol, and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a switch cabinet partial discharge transient voltage-to-ground voltage detection system based on a wireless network, which can perform online monitoring and positioning on partial discharge in a switch cabinet by using a TEV sensor and a wireless sensor network technology thereof.
The technical scheme adopted by the invention is as follows: a wireless network-based system for detecting the voltage to ground of a local discharge transient state of a switch cabinet comprises: a signal acquisition unit, a signal transmission unit, a data acquisition and analysis unit and a human-computer interface which are connected in series in turn, wherein,
the signal acquisition unit is used for acquiring partial discharge signals and comprises a transient voltage-to-ground voltage sensor, a filter circuit, an amplifying circuit and an analog-to-digital conversion circuit which are sequentially connected in series, wherein the output end of the analog-to-digital conversion circuit is connected with the signal transmission unit;
the signal transmission unit carries out long-distance transmission and comprises a GPRS transmitting device and a GPRS receiving device for receiving signals of the GPRS transmitting device, wherein the signal input end of the GPRS transmitting device is connected with the analog-to-digital conversion circuit of the signal acquisition unit, and the output end of the GPRS receiving device is connected with the data acquisition and analysis unit;
the data acquisition and analysis unit is used for acquiring partial discharge data, analyzing, judging and storing the partial discharge data, and a computer or a high-speed DSP chip is used as a main processor;
the human-computer interface is used for displaying the detection result of the whole system.
The transient voltage-to-ground voltage sensor is provided with a plurality of sensors, wherein the distance between every two adjacent sensors is more than or equal to 60 cm.
The analog-to-digital conversion circuit adopts a high-frequency A/D conversion chip.
And a metal shield is adopted outside the transient voltage-to-ground voltage sensor.
The data acquisition and analysis unit is also provided with a network communication port.
The invention discloses a system for detecting the voltage to ground of a local discharge transient state of a switch cabinet based on a wireless network, which has the following characteristics:
(1) the transient voltage To Earth (TEV) sensor is directly arranged on the grounded switch cabinet shell, so that the defects of low sensitivity and serious interference of the sensor used in the existing partial discharge online monitoring are overcome; a plurality of sensors can be arranged on a switch cabinet shell and form a network, and all sensor nodes cooperate with each other to jointly complete a multi-position data acquisition task, so that multi-position partial discharge monitoring and positioning information acquisition in the switch cabinet are realized.
(2) The TEV sensor and the processing terminal adopt a wireless transmission mode, and are well isolated from high-voltage equipment, so that the safety of the equipment and measuring personnel can be ensured; meanwhile, the equivalence problem of online results and offline results does not exist.
(3) The wireless sensor network node allows a certain failure rate, and once a sensor fails, the network automatically re-networks, so that the monitoring system can work uninterruptedly.
(4) The network nodes have certain computing and storage capabilities. The data can be pre-processed, which is not possible with conventional sensor networks. On one hand, the data volume of transmission can be reduced, the node energy is saved, and the service life of the network is prolonged; on the other hand, the amount of data transmitted to the data processing center is greatly reduced.
(5) Part of nodes of the network can move, and the topology structure is dynamic. Due to the fact that the sensor nodes are switched between the working state and the sleeping state, or part of the sensor nodes move, and the sensor nodes are possibly failed due to various reasons at any time, the topology structure of the wireless sensor network is changed rapidly, and the wireless sensor network can adapt to the dynamics of the network topology structure through a protocol.
(6) The upper computer analysis software has strong functions, comprises a database and an analysis module, can look up historical information, analyze partial discharge characteristics from various angles and perform pattern recognition.
(7) The full digital display is completed, the interface is more visual and concise, and the functions are comprehensive.
(8) Compared with the prior art, the method has the advantages that the detection is safe, rapid and accurate, the operation and the diagnosis of workers are convenient, the detection of the local discharge intensity in the switch cabinet can be realized in a non-power-off state by adopting a T-transient voltage-to-earth method, the simultaneous detection of a plurality of switch cabinet states can be realized by wirelessly transmitting the acquisition result to the data analysis unit, and the discharge fault can be timely discovered and eliminated.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention;
fig. 2 is an external view of the sensor of the present invention.
Wherein:
1: the signal acquisition unit 2: signal transmission unit
3: the data acquisition and analysis unit 4: human-machine interface
11: transient-to-ground voltage sensor 12: filter circuit
13: the amplifier circuit 14: analog-to-digital conversion circuit
15: the metal shield 21: GPRS transmitting device
22: the GPRS receiving apparatus 31: data acquisition
32: data analysis 33: network communication
41: the data store 42: display device
43: parameter setting 44: alarm device
Detailed Description
The following provides a specific embodiment with reference to the accompanying drawings, which further illustrates how the system for detecting the voltage to the ground of the local discharge transient state of the switch cabinet based on the wireless network according to the present invention is implemented.
The main purpose of the invention is to realize real-time detection of the state change of the partial discharge level in the operating switch cabinet through online TEV partial discharge detection, describe the partial discharge characteristics of the switch cabinet from multiple angles and research the dielectric property of the insulating part in the switch cabinet. The object of the invention can be achieved by the following measures: the wireless local discharge detection system based on the ZigBee technology is a wireless local discharge detection system based on the emerging ZigBee technology, and real-time and dynamic monitoring of local discharge of the switch cabinet is realized by utilizing a mature GPRS network.
Fig. 1 is a schematic diagram of a system structure of the invention, and as shown in fig. 1, the system for detecting the local discharge transient voltage to ground of the switch cabinet based on the wireless network of the invention can be used for detecting the local discharge of the switch cabinet with a voltage class of 10kV and above. The method comprises the following steps: the system comprises a signal acquisition unit 1, a signal transmission unit 2, a data acquisition and analysis unit 3 and a human-computer interface 4 which are sequentially connected in series. Wherein,
the signal acquisition unit 1 is used for acquiring partial discharge signals and comprises a transient voltage-to-ground (TEV) sensor 11, a filter circuit 12, an amplifying circuit 13 and an analog-to-digital conversion circuit 14 which are sequentially connected in series, wherein the output end of the analog-to-digital conversion circuit 14 is connected with the signal transmission unit 2; the transient voltage-to-ground voltage sensor 11 is provided in plurality, wherein the distance between every two adjacent sensors is greater than or equal to 60 cm. The transient voltage-to-ground voltage sensor 11 is shown in fig. 2, and adopts a capacitance sensor, signals are led out from two side electrodes to two wires 16 and 17, and a metal shield 15 is adopted outside to avoid external interference. The analog-to-digital conversion circuit 14 adopts a high-frequency A/D conversion chip with the model number of AD 9481.
When partial discharge occurs in the switch cabinet, a corresponding TEV signal can be generated on the shell of the switch cabinet, the TEV voltage signal can be detected by the TEV sensor and sent to the filtering and amplifying circuit, the interference signal needing to be filtered at the position is power frequency interference and external signals such as FM radio signals and the like, the signal enters the amplifying circuit after being filtered to be amplified without distortion, and then is transmitted to the analog-to-digital conversion circuit to be converted into a digital signal, and a high-frequency A/D conversion chip is needed due to the high-frequency characteristic of the TEV signal. The unit adopts n paths of probes to detect simultaneously, and is convenient for mastering the partial discharge condition of each switch cabinet. A high-pass circuit is adopted to set the frequency band at several MHz to dozens of MHz, so that interference signals are effectively avoided and partial discharge signals are obtained.
The signal transmission unit 2 carries out long-distance transmission and comprises a GPRS transmitting device 21 and a GPRS receiving device 22 for receiving signals of the GPRS transmitting device 21, wherein the signal input end of the GPRS transmitting device 21 is connected with the analog-to-digital conversion circuit 14 of the signal acquisition unit 1, and the output end of the GPRS receiving device 22 is connected with the data acquisition and analysis unit 3;
the measured signal is converted into a digital signal and then input into a GPRS transmitting device, is transmitted to a GPRS receiving device through a GPRS network, and then enters a next-stage processing circuit, namely a data acquisition and analysis unit 3.
The data acquisition and analysis unit 3 is used for acquiring, analyzing and storing partial discharge data, judging the partial discharge state in the switch cabinet and transmitting the analysis result to a subsequent unit. Adopting a computer or a high-speed DSP chip as a main processor; the specific method is that a high-speed DSP chip is used as a main processor, after a digital signal of a previous stage is received, the amplitude of the received signal is measured, and the number of TEV pulses is calculated. And judging the intensity of partial discharge in the switch cabinet by taking the magnitude of the measured TEV signal value and the pulse number as the basis. The data acquisition and analysis unit 3 is also provided with a network communication port 33, and can perform network transmission on the monitoring result if necessary, so as to realize remote control and diagnosis and know the partial discharge condition of the tested switch cabinet in time.
The human-computer interface 4 is used for displaying the detection result of the whole system. And the detection results of the whole system, including the existence of partial discharge, the strength of partial discharge signals and the like, are visually displayed, and reference is provided for operators. The staff realizes the relevant setting and operation of the partial discharge system through the interface. The specific method is that a high-brightness LED screen is adopted to visually display the result value output by the DSP, and the displayed data is as follows: pulse voltage relative amplitude (dB is unit), pulse number in a measuring period and the like; the man-machine interface is provided with a button which can control the equipment and comprises the functions of measurement and zero clearing.
The power supply adopts built-in lithium cell power supply, avoids adopting the signal interference that external power source arouses.
The invention discloses a system for detecting the voltage to ground of a switch cabinet in a partial discharge transient state based on a wireless network, which comprises the following specific use environment and a method thereof.
1. Environment of use
Altitude: less than or equal to 1000m.
Working temperature: -20 ℃ to 40 DEG C
Working humidity: 0-90% and no condensation
The tested equipment in the places without fire hazard, explosion danger, serious pollution chemical corrosion, violent vibration, strong electromagnetic interference and lightning stroke needs to be well grounded
Storage temperature: 0-50 deg.C
2. Application method
(1) And detecting partial discharge. The TEV sensor is attached to the grounded switch cabinet shell for detection, when partial discharge occurs in the switch cabinet, the TEV sensor collects TEV signals on the surface of the switch cabinet, the TEV signals are processed by the filter amplifying circuit to obtain initial signals, the initial signals are converted into digital signals through analog-to-digital conversion and are transmitted to the GPRS module, and data are transmitted to the remote monitoring center through the GPRS network; on the other hand, the monitoring center can also send a TEV partial discharge acquisition command to the GPRS module in an active mode. The monitoring center provides VB development-based switch cabinet TEV part discharge monitoring and analyzing software which integrates the functions of data configuration, data acquisition, data monitoring and background management. After the data are transmitted to the monitoring center, the characteristic quantity of the partial discharge is calculated through analysis and statistics, and the characteristic of the partial discharge is distinguished: and respectively drawing a plurality of phase distribution maps of partial discharge quantity expressing different partial discharge characteristics, a discharge quantity distribution map, a discharge frequency distribution map and transient changes of the partial discharge quantity distribution map and the discharge frequency distribution map and the transient changes, and performing pattern recognition.
(2) And positioning a partial discharge point. When the invention is used for partial discharge positioning, the distance between the two sensors is required to be not less than 60cm for the position of the sensors. The specific using method comprises the following steps: the sensor network is arranged on the surface of the switch cabinet, the TEV signal values of the sensors displayed by the terminal are compared, the closer the sensor with the higher TEV signal value is to the position of a discharge point, and when the TEV signal values displayed by the two sensors are the same, the discharge point is between the two sensors. The method can be used for positioning the position of the partial discharge point in the switch cabinet and providing reference for maintenance.
Claims (5)
1. A system for detecting the voltage to ground of a local discharge transient state of a switch cabinet based on a wireless network is characterized by comprising: a signal acquisition unit (1), a signal transmission unit (2), a data acquisition and analysis unit (3) and a human-computer interface (4) which are connected in series in turn, wherein,
the signal acquisition unit (1) is used for acquiring partial discharge signals and comprises a transient voltage-to-ground voltage sensor (11), a filter circuit (12), an amplification circuit (13) and an analog-to-digital conversion circuit (14) which are sequentially connected in series, wherein the output end of the analog-to-digital conversion circuit (14) is connected with the signal transmission unit (2);
the signal transmission unit (2) carries out remote transmission and comprises a GPRS transmitting device (21) and a GPRS receiving device (22) for receiving signals of the GPRS transmitting device (21), wherein the signal input end of the GPRS transmitting device (21) is connected with an analog-to-digital conversion circuit (14) of the signal acquisition unit (1), and the output end of the GPRS receiving device (22) is connected with the data acquisition and analysis unit (3);
the data acquisition and analysis unit (3) is used for acquiring partial discharge data, analyzing, judging and storing the partial discharge data, and a computer or a high-speed DSP chip is used as a main processor;
the human-computer interface (4) is used for displaying the detection result of the whole system.
2. The system for detecting the local discharge transient voltage to ground of the switch cabinet based on the wireless network as claimed in claim 1, wherein a plurality of transient voltage to ground sensors (11) are provided, and the distance between every two adjacent sensors is greater than or equal to 60 cm.
3. The system for detecting the local discharge transient voltage to ground of the switch cabinet based on the wireless network as claimed in claim 1, wherein the analog-to-digital conversion circuit (14) adopts a high-frequency A/D conversion chip.
4. The system for detecting the local discharge transient voltage to ground of the switch cabinet based on the wireless network as claimed in claim 1, wherein a metal shield is used outside the transient voltage to ground sensor (11).
5. The system for detecting the partial discharge transient voltage to ground of the switch cabinet based on the wireless network as claimed in claim 1, wherein the data acquisition and analysis unit (3) is further provided with a network communication port (33).
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| CN106711944A (en) * | 2017-01-13 | 2017-05-24 | 大连海洋大学 | Reactive compensation protection device in power transmission and transformation system |
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| CN107525958A (en) * | 2017-07-05 | 2017-12-29 | 中国电力科学研究院 | A kind of transient state device and method that induced voltage measures over the ground being used for power equipment |
| CN108680843A (en) * | 2018-08-21 | 2018-10-19 | 广西电网有限责任公司电力科学研究院 | A kind of method for detection of partial discharge of switch cabinet based on Radio Transmission Technology |
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| CN109828189A (en) * | 2019-02-19 | 2019-05-31 | 福建聚实新能源科技有限公司 | Partial discharge on-Line Monitor Device, system and method based on ubiquitous electric power Internet of Things |
| CN109884489A (en) * | 2019-02-18 | 2019-06-14 | 上海金艺检测技术有限公司 | For switchgear the ad hoc network sensing device of electric wave |
| CN110501617A (en) * | 2019-07-11 | 2019-11-26 | 特斯联（北京）科技有限公司 | A kind of partial discharge of switchgear detection system and method |
| CN110988622A (en) * | 2019-11-29 | 2020-04-10 | 河南省恒华电力设备有限公司 | High tension switchgear partial discharge monitoring and early warning system |
| CN111856224A (en) * | 2020-06-29 | 2020-10-30 | 国网河南省电力公司周口供电公司 | Partial discharge multi-source fusion detection system and method for high-voltage switch cabinet |
| CN112880740A (en) * | 2021-01-21 | 2021-06-01 | 上海迈内能源科技有限公司 | Transformer running state on-line monitoring system and multi-parameter intelligent sensor thereof |
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| CN103869222A (en) * | 2012-12-12 | 2014-06-18 | 山东电力集团公司济宁供电公司 | Bus insulation state monitoring system and method |
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| CN104777408A (en) * | 2015-03-24 | 2015-07-15 | 国家电网公司 | TEV on-line monitoring system for partial discharge of switch cabinet based on Internet of Things |
| CN104730440A (en) * | 2015-04-03 | 2015-06-24 | 国家电网公司 | TEV-based switch cabinet partial discharge detection system |
| CN105158657A (en) * | 2015-08-26 | 2015-12-16 | 芜湖市凯鑫避雷器有限责任公司 | High-voltage switch cabinet partial discharge online monitoring system |
| CN105467313A (en) * | 2016-01-07 | 2016-04-06 | 广东电网有限责任公司电力科学研究院 | Online power system circuit breaker mechanical fault diagnosis system |
| CN105759105A (en) * | 2016-04-27 | 2016-07-13 | 国网四川省电力公司电力科学研究院 | Transient voltage monitoring device and method for direct-current field of high-voltage convertor station |
| CN106353650A (en) * | 2016-09-23 | 2017-01-25 | 厦门矿通科技有限公司 | Power cable partial-discharge monitoring device and monitoring method thereof |
| CN106711944A (en) * | 2017-01-13 | 2017-05-24 | 大连海洋大学 | Reactive compensation protection device in power transmission and transformation system |
| CN106771933A (en) * | 2017-01-23 | 2017-05-31 | 天津大学 | Power cable shelf depreciation high frequency electric monitoring system based on wireless network |
| CN107525958A (en) * | 2017-07-05 | 2017-12-29 | 中国电力科学研究院 | A kind of transient state device and method that induced voltage measures over the ground being used for power equipment |
| CN108680843A (en) * | 2018-08-21 | 2018-10-19 | 广西电网有限责任公司电力科学研究院 | A kind of method for detection of partial discharge of switch cabinet based on Radio Transmission Technology |
| CN109507549A (en) * | 2018-11-16 | 2019-03-22 | 天津大学 | Partial discharge of switchgear based on wireless network monitors system |
| CN109884489A (en) * | 2019-02-18 | 2019-06-14 | 上海金艺检测技术有限公司 | For switchgear the ad hoc network sensing device of electric wave |
| CN109828189A (en) * | 2019-02-19 | 2019-05-31 | 福建聚实新能源科技有限公司 | Partial discharge on-Line Monitor Device, system and method based on ubiquitous electric power Internet of Things |
| CN110501617A (en) * | 2019-07-11 | 2019-11-26 | 特斯联（北京）科技有限公司 | A kind of partial discharge of switchgear detection system and method |
| CN110988622A (en) * | 2019-11-29 | 2020-04-10 | 河南省恒华电力设备有限公司 | High tension switchgear partial discharge monitoring and early warning system |
| CN111856224A (en) * | 2020-06-29 | 2020-10-30 | 国网河南省电力公司周口供电公司 | Partial discharge multi-source fusion detection system and method for high-voltage switch cabinet |
| CN112880740A (en) * | 2021-01-21 | 2021-06-01 | 上海迈内能源科技有限公司 | Transformer running state on-line monitoring system and multi-parameter intelligent sensor thereof |
| CN113189457A (en) * | 2021-04-26 | 2021-07-30 | 天津大学 | Multi-scale feature extraction technology based on partial discharge original time domain waveform |
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