CN-121995179-A - On-line monitoring method, device and system for equipment partial discharge facing power distribution station room

CN121995179ACN 121995179 ACN121995179 ACN 121995179ACN-121995179-A

Abstract

The application relates to the technical field of local discharge data monitoring of a power distribution station room, in particular to a local discharge on-line monitoring method, equipment and a system for equipment of the power distribution station room, wherein the method comprises the steps of synchronously acquiring a plurality of monitoring signals of electrical equipment in a plurality of switch cabinet bodies of a first power distribution station room by adopting a plurality of ultrahigh frequency probes, and transmitting the plurality of monitoring signals to a host computer of a first local discharge sensor, wherein the host computer is arranged on the outer surface of the switch cabinet; the method comprises the steps that a host computer performs feature extraction on a plurality of monitoring signals to obtain first multisource discharge feature data based on a plurality of switch cabinets and sends the first multisource discharge feature data to first edge equipment corresponding to a first distribution substation room, the first edge equipment collects the first multisource discharge feature data and second multisource discharge feature data in real time, and first distribution monitoring data of the first distribution substation room are obtained through edge analysis. According to the application, the plurality of switch cabinets of the power distribution station room are monitored simultaneously, so that the synchronous monitoring and the accurate positioning of signal sources of the plurality of switch cabinets are realized, and the accuracy and the economical efficiency of the partial discharge monitoring of the power distribution station room are improved.

Inventors

MENG CHAO
SU YINGHUI
WANG WEIYAO
WANG YUEHAN
GUO XIAOCONG
Bi Zeyuan
WANG MINGXUAN
BAI YAN
SONG XUPENG
ZHANG XIAOCHEN
LIU ZHEN
LI MINGCHUN
WEI GUANGTAO
WANG ZELI
REN LIZHI
LIU ZEYU

Assignees

国网北京市电力公司

Dates

Publication Date: 20260508
Application Date: 20260319

Claims (10)

1. An on-line monitoring method for equipment partial discharge facing a distribution station room is characterized by comprising the following steps: A plurality of ultrahigh frequency probes are adopted to synchronously acquire a plurality of monitoring signals of electrical equipment in a plurality of switch cabinet bodies of a first power distribution station room, and the monitoring signals are transmitted to a host arranged on the outer surface of the switch cabinet of a first partial discharge sensor; The host computer performs feature extraction on the plurality of monitoring signals to obtain first multi-source discharge feature data of a plurality of switch cabinets corresponding to the first partial discharge sensor, and sends the first multi-source discharge feature data to first edge equipment corresponding to the first power distribution station room, wherein the first multi-source discharge feature data comprises waveform features, amplitude features and time sequence features; And the first edge equipment collects the first multi-source discharge characteristic data from the first partial discharge sensor and the second multi-source discharge characteristic data from the second partial discharge sensor in real time, and obtains first power distribution monitoring data of the first power distribution station room after performing edge analysis.
2. The method for monitoring the partial discharge of equipment in a distribution station room according to claim 1, wherein the ultrahigh frequency probe is deployed at an electrical space in the switch cabinet or at a cabinet body gap, the ultrahigh frequency probes are respectively connected with the host through shielding cables to form a space diversity receiving array, the plurality of ultrahigh frequency probes are used for synchronously collecting a plurality of monitoring signals of electrical equipment in the switch cabinet body of a first distribution station room, and the monitoring signals are transmitted to the host of a first partial discharge sensor, which is arranged on the outer surface of the switch cabinet, and the method comprises the following steps: The host performs polling switching on multiple paths of ultrahigh frequency antenna signals corresponding to the ultrahigh frequency probes respectively through a high-isolation radio frequency channel change-over switch, and determines that one path of ultrahigh frequency antenna signals are transmitted to a conditioning unit of the host; The conditioning unit filters, detects and amplifies the received ultrahigh frequency antenna signal and outputs the signal to the sampling unit of the host; and the sampling unit performs high-speed AD sampling on the conditioned ultrahigh frequency antenna signal to form a digital signal and transmits the digital signal to the processing unit of the host.
3. The substation-oriented equipment partial discharge online monitoring method according to claim 2, wherein the host performs feature extraction on the plurality of monitoring signals to obtain first multi-source discharge feature data of a plurality of switch cabinets corresponding to the first partial discharge sensor, and the method comprises the following steps: the processing unit carries out effective signal identification on the received digital signals in real time, and extracts the maximum value, average value, phase, rising edge and falling edge pulse repetition rate of effective pulses; For each monitoring signal, the processing unit organizes the extracted characteristic parameters into standard data frames according to a preset communication protocol to form on-line discharge characteristic data in a data packet format corresponding to the monitoring signals of the switch cabinets, wherein each on-line discharge characteristic data at least comprises a switch cabinet identifier corresponding to the monitoring signal; The processing unit combines on-line discharge characteristic data corresponding to a plurality of monitoring signals from the plurality of switch cabinets respectively to form first multi-source discharge characteristic data, wherein the first multi-source discharge characteristic data at least comprises a sensor equipment number of the first partial discharge sensor.
4. The substation-oriented device partial discharge online monitoring method according to claim 3, wherein the transmitting the first multi-source discharge characteristic data to the first edge device corresponding to the first substation comprises: And the processing unit transmits the first multi-source discharge characteristic data to the first edge equipment through a built-in LoRa wireless module.
5. The substation-oriented equipment partial discharge online monitoring method according to claim 4, wherein the first edge equipment gathers the first multi-source discharge characteristic data from the first partial discharge sensor and the second multi-source discharge characteristic data from the second partial discharge sensor in real time, and obtains first distribution monitoring data of the first substation after performing edge analysis, and the method comprises: the first edge equipment receives the first multi-source discharge characteristic data and the second multi-source discharge characteristic data in real time, and performs time synchronization calibration and data integrity verification on the first multi-source discharge characteristic data and the second multi-source discharge characteristic data to obtain calibrated multi-source data; Comparing the partial discharge amplitude characteristic corresponding to each switch cabinet in the multi-source data with a preset threshold value, and generating an abnormal early warning mark of the switch cabinet under the condition that the partial discharge amplitude characteristic exceeds the preset threshold value; Aiming at the online discharge characteristic data corresponding to each switch cabinet, calculating the partial discharge amplitude, the change rate of pulse repetition rate and the change trend based on a plurality of groups of continuously acquired discharge characteristic data, judging whether the online discharge characteristic data continuously rises or suddenly changes or not through linear fitting and sliding window analysis, and generating an abnormal early warning mark of the switch cabinet under the condition that the online discharge characteristic data continuously rises or suddenly changes; The first edge equipment generates real-time state identifiers corresponding to the switch cabinets in real time according to the preliminary analysis result, and forms first power distribution monitoring data based on the real-time state identifiers corresponding to the switch cabinets and discharge characteristic data matched with the real-time state identifiers, wherein the real-time state identifiers comprise normal states, amplitude anomalies and trend anomalies.
6. The substation-oriented equipment partial discharge on-line monitoring method according to claim 1, further comprising, when a plurality of ultra-high frequency probes are used to collect a plurality of monitoring signals of a plurality of electrical equipment in a switchgear cabinet of a first substation, simultaneously: Synchronously collecting station room environment data of the first power distribution station room, wherein the station room environment data comprise temperature, humidity, overground/underground positions, operational years, fault handling records, operation and maintenance inspection records and equipment operation data; and analyzing key environmental factors causing insulation degradation of station room equipment of the first power distribution station room by combining the station room environmental data and the first power distribution monitoring data.
7. The substation-oriented equipment partial discharge on-line monitoring method according to claim 6, wherein the analyzing the key environmental factors that cause the degradation of the substation equipment insulation of the first substation room by combining the substation environment data with the first distribution monitoring data comprises: Acquiring electric operation data of a plurality of switch cabinets corresponding to the first partial discharge sensor and the second partial discharge sensor, and performing space-time alignment and cleaning on the electric operation data, the first power distribution monitoring data, the station room environment data and the equipment ledgers to form a panoramic characteristic data set of the first power distribution station room; Preliminary screening key features by using correlation analysis and principal component analysis, and constructing a binary logistic regression model to quantify the influence degree of each factor on the partial discharge risk, and identifying significant influence factors, wherein the significant influence factors comprise load rate, temperature and humidity and equipment service life; and (3) detecting a multi-factor synergistic effect by introducing interaction term analysis, and combining the partial dependency graph with Shapley value decomposition to realize decoupling quantification of the environmental factors, so as to determine the key environmental factors.
8. The substation-oriented equipment partial discharge online monitoring method according to claim 7, wherein the step of checking the multi-factor synergistic effect by introducing interaction item analysis and combining the partial dependence graph with Shapley value decomposition to realize decoupling quantification of the environmental factors, and the step of determining the key environmental factors comprises the following steps: taking the temperature and the humidity as independent variables into a binary logistic regression model, and respectively calculating the influence degree of the temperature and the humidity on the partial discharge risk; introducing a temperature and humidity interaction term, judging whether a synergistic enhancement effect exists between the temperature and humidity interaction term through regression coefficient significance test, and under the condition that the interaction term is significant, indicating that the high-temperature and high-humidity environment has a coupling degradation effect; And (3) visualizing a marginal effect curve of a single environmental factor by adopting a partial dependence graph and Shapley value decomposition method under the condition of controlling other variables to be unchanged, decoupling multi-factor interweaving influence into independent contribution amounts of all factors, dividing a temperature and humidity combination into different risk level intervals, and carrying out accurate quantitative analysis on the environmental factors to determine the key environmental factors.
9. A partial discharge sensor for synchronously acquiring multi-source discharge characteristic data from a plurality of switch cabinets, comprising: The ultrahigh frequency probes are used for synchronously collecting a plurality of monitoring signals of electrical equipment in a plurality of switch cabinet bodies of the distribution station room and transmitting the plurality of monitoring signals to the host; The host is arranged on the outer surface of any switch cabinet and used for receiving a plurality of monitoring signals from the plurality of switch cabinets, extracting characteristics of the plurality of monitoring signals to obtain multi-source discharge characteristic data, and then sending the multi-source discharge characteristic data to corresponding edge equipment of the distribution station room, wherein the multi-source discharge characteristic data comprises waveform characteristics, amplitude characteristics and time sequence characteristics.
10. An on-line monitoring system is put in equipment office towards distribution substation room, is applied to the distribution substation room, characterized in that, the system includes: The first partial discharge sensor comprises a first host, a first ultrahigh frequency probe, a second ultrahigh frequency probe, a third ultrahigh frequency probe and a fourth ultrahigh frequency probe, wherein the first ultrahigh frequency probe, the second ultrahigh frequency probe, the third ultrahigh frequency probe and the fourth ultrahigh frequency probe are respectively arranged in a first switch cabinet, a second switch cabinet, a third switch cabinet and a fourth switch cabinet, the first host is arranged on the outer surface of any one of the first switch cabinet, the second switch cabinet, the third switch cabinet and the fourth switch cabinet, the first ultrahigh frequency probe, the second ultrahigh frequency probe, the third ultrahigh frequency probe and the fourth ultrahigh frequency probe are respectively used for acquiring monitoring signals of electrical equipment in the first switch cabinet, the second switch cabinet, the third switch cabinet and the fourth switch cabinet, the acquired monitoring signals are synchronously transmitted to the first host, and the first host processes the acquired signals of the first switch cabinet, the second switch cabinet, the third switch cabinet and the fourth switch cabinet into first multi-source discharge monitoring data; The second partial discharge sensor comprises a second host, a fifth ultrahigh frequency probe, a sixth ultrahigh frequency probe, a seventh ultrahigh frequency probe and an eighth ultrahigh frequency probe, wherein the fifth ultrahigh frequency probe, the sixth ultrahigh frequency probe, the seventh ultrahigh frequency probe and the eighth ultrahigh frequency probe are respectively deployed in a fifth switch cabinet, a sixth switch cabinet, a seventh switch cabinet and an eighth switch cabinet body, the second host is deployed on the outer surface of any one of the fifth switch cabinet, the sixth switch cabinet, the seventh switch cabinet and the eighth switch cabinet, the fifth ultrahigh frequency probe, the sixth ultrahigh frequency probe, the seventh ultrahigh frequency probe and the eighth ultrahigh frequency probe are respectively used for acquiring monitoring signals of electrical equipment in the fifth switch cabinet, the sixth switch cabinet, the seventh switch cabinet and the eighth switch cabinet, and synchronously transmitting the acquired monitoring signals to the second host, and the second host processes the acquired monitoring signals of the fifth switch cabinet, the sixth switch cabinet, the seventh switch cabinet and the eighth switch cabinet as multiple-source discharge data; The first edge equipment is deployed in the distribution station room and is used for synchronously receiving the first multi-source discharge characteristic data and the second multi-source discharge characteristic data, and obtaining distribution monitoring data of the distribution station room after edge analysis so as to transmit the distribution monitoring data to the cloud master station.

Description

On-line monitoring method, device and system for equipment partial discharge facing power distribution station room Technical Field The application relates to the technical field of local discharge data monitoring of power distribution station rooms, in particular to a local discharge on-line monitoring method, equipment and a system for equipment of the power distribution station rooms. Background Along with the continuous expansion of the scale of the urban power distribution network and the continuous improvement of the intelligent level, the power distribution station room is used as a core node for connecting the main network and the user terminal, and the reliability of the running state of the power distribution station room is directly related to the power supply quality and the power grid safety. In the monitoring of the partial discharge of the equipment of the power distribution station room, the ultrahigh frequency electromagnetic wave signal has strong anti-interference capability due to the natural shielding effect of a frequency band, can judge the early state of weak discharge by directly capturing the electromagnetic wave signal generated in the partial discharge process, has obvious response to early and hidden insulation defects, can meet the monitoring requirement of the power distribution station room for no-stop operation through non-contact and electrified detection, and has the prospect of being widely applied to the field of the monitoring of the partial discharge data of the power distribution station room. However, because the equipment such as the switch cabinet is used as a metal closed structure, the metal shell is tightly covered, the ultrahigh frequency signals generated by internal partial discharge can only be collected from equipment gaps and observation windows, and a large amount of effective signals can be blocked by the partition structures such as the metal partition plates, the bus bar chamber/the cable chamber/the breaker chamber when propagating in the cabinet body, so that the signal energy is greatly absorbed or reflected, and is difficult to propagate outside the cabinet body by penetrating through the complete metal wall surface. Moreover, in the existing application, the monitoring device needs to be installed outside the switchgear body in an attaching mode and the like to realize long-term monitoring of the state of the switchgear body, and at present, the single-set installation cost is high, and when more switch cabinets are arranged in the power distribution station chamber, high investment which is difficult to bear is generated. Taking an open-close station as an example, if 10 sets of switch cabinets are arranged in the station, the investment of station room monitoring equipment can reach 8-20 ten thousand yuan, and the labor cost and the funds required by annual equipment maintenance and battery replacement are also difficult to burden. Disclosure of Invention Aiming at the problems, the application provides the equipment partial discharge on-line monitoring method, equipment and a system for the distribution station room, which realize multi-cabinet synchronous monitoring and accurate positioning of signal sources on the premise of avoiding signal crosstalk by simultaneously monitoring a plurality of switch cabinets of the distribution station room, thereby greatly improving the accuracy and the economy of the distribution station room partial discharge monitoring. In order to achieve the purpose of the application, the application provides the following technical scheme: in a first aspect, the present application provides a method for on-line monitoring of local discharge of equipment in a distribution substation, including: A plurality of ultrahigh frequency probes are adopted to synchronously acquire a plurality of monitoring signals of electrical equipment in a plurality of switch cabinet bodies of a first power distribution station room, and the monitoring signals are transmitted to a host arranged on the outer surface of the switch cabinet of a first partial discharge sensor; The host computer performs feature extraction on the plurality of monitoring signals to obtain first multi-source discharge feature data of a plurality of switch cabinets corresponding to the first partial discharge sensor, and sends the first multi-source discharge feature data to first edge equipment corresponding to the first power distribution station room, wherein the first multi-source discharge feature data comprises waveform features, amplitude features and time sequence features; And the first edge equipment collects the first multi-source discharge characteristic data from the first partial discharge sensor and the second multi-source discharge characteristic data from the second partial discharge sensor in real time, and obtains first power distribution monitoring data of the first power distribution station room after performing edge analysis. The ultra-high f