CN-121978514-A - Intelligent monitoring system for isolating switch

CN121978514ACN 121978514 ACN121978514 ACN 121978514ACN-121978514-A

Abstract

The invention relates to the technical field of monitoring of isolating switches, in particular to an intelligent monitoring system of an isolating switch, which comprises a data acquisition unit, a data receiving and transmitting unit, a data collecting unit, a data transmission unit and a data processing unit, wherein the data acquisition unit is used for acquiring multi-source sensing data reflecting the operation state of the isolating switch, the data receiving and transmitting unit is connected with the data acquisition unit and used for receiving the multi-source sensing data and performing preliminary processing, the data collecting unit is connected with the data receiving and transmitting unit and used for receiving and collecting the data from the data receiving and transmitting unit and storing the data, the data transmission unit is connected with the data collecting unit and used for remotely transmitting the collected data to the rear end, and the data processing unit is connected with the data transmission unit and used for analyzing the received data so as to evaluate the operation state of the isolating switch and perform fault prediction. The system can accurately discover abnormality in time and effectively improve the reliability and safety of the railway power supply system.

Inventors

LI FEI
LI SHUAI
LI QINGJUN
WANG YUHUAN
LI CHONG
NIE JINGXIN
ZHANG XUEWU
JIN GUANG
ZHANG CHENG
WANG QIANG
TIAN SHENGPING
SONG YANG
JING YI

Assignees

中铁第一勘察设计院集团有限公司

Dates

Publication Date: 20260505
Application Date: 20251126

Claims (10)

1. The isolating switch intelligent monitoring system is characterized by comprising a data acquisition unit, a data receiving and transmitting unit, a data collecting unit, a data transmission unit and a data processing unit; The data acquisition unit is used for acquiring multi-source sensing data reflecting the operation state of the isolating switch, and the multi-source sensing data at least comprises angle data representing the mechanical position of the disconnecting link, temperature data representing the contact state of the contact and current and voltage data representing the electrical load; the data receiving and transmitting unit is connected with the data acquisition unit and is used for receiving the multi-source sensing data and performing preliminary processing; the data collecting unit is connected with the data receiving and transmitting unit and is used for receiving and collecting the data from the data receiving and transmitting unit and storing the data; the data transmission unit is connected with the data collection unit and is used for remotely transmitting the collected data to the rear end; the data processing unit is connected with the data transmission unit and is used for analyzing the received data to evaluate the running state of the isolating switch and conduct fault prediction, and generating alarm information when the abnormality is judged to exist.
2. The intelligent monitoring system of an isolating switch as in claim 1, wherein said data acquisition unit comprises: the angle sensor is used for monitoring the angle change in the opening and closing processes of the isolating switch; The temperature rise sensor is used for monitoring the temperature change of the isolating switch contact; the current sensor is arranged in a current loop of the isolating switch and is used for measuring a current value in real time; The voltage sensor is arranged in a voltage loop of the isolating switch and used for measuring the voltage value in real time.
3. The intelligent monitoring system of an isolating switch of claim 2, wherein the data processing unit is configured to: Calculating the deviation value of the current angle and the standard angle, sending out an emergency warning signal when the deviation value exceeds a first-level set threshold value, and sending out an early warning signal when the deviation value exceeds a second-level set threshold value; And calculating the temperature change rate of the contact, sending an emergency alarm signal when the temperature change rate exceeds a first-level set threshold value, and sending an early warning signal when the temperature change rate exceeds a second-level set threshold value.
4. The intelligent monitoring system of the isolating switch according to claim 1, wherein the temperature rise sensor is arranged in a static contact current-carrying transition zone determined by finite element temperature field simulation.
5. The intelligent monitoring system of claim 1, wherein the data transceiver unit is a passive short-distance transceiver, and is disposed on the sensor body, the cable or the jumper adapter board.
6. The intelligent monitoring method of the isolating switch based on the intelligent monitoring system of the isolating switch of any one of claims 1 to 4 is characterized by comprising the following steps: S1, multi-source data acquisition, namely respectively acquiring angle, contact temperature, current and voltage data of an isolating switch through an angle sensor, a temperature rise sensor, a current sensor and a voltage sensor; s2, data preprocessing and transmission, wherein the data receiving and transmitting unit receives the data of each sensor, and the data are transmitted to the data collecting unit after verification, error correction and format conversion; S3, data is collected and stored, data is received through a data collection unit, time stamp alignment, data cleaning and association integration are carried out, and the data is stored in a local database; S4, data transmission, namely, transmitting the data processed by the data collecting unit to the data processing unit through the data transmission unit; and S5, analyzing and processing the received data through a data processing unit to realize the evaluation and the fault prediction of the operation state of the isolating switch, and giving an alarm when the isolating switch is abnormal.
7. The intelligent monitoring method of the isolating switch as in claim 6, wherein S5 comprises the steps of: S51, data preprocessing, namely checking and correcting the collected original angle data, denoising the collected original angle data by using wavelet transformation, and extracting low-frequency trend components for analysis; S52, mode construction, namely training a hidden Markov model based on a large amount of angle change data under normal and fault states collected and marked in the actual operating environment of the isolating switch to obtain state modes representing different operating states; and S53, performing real-time mode matching, preprocessing the angle data acquired in real time, performing matching degree calculation on the obtained sequence and the trained state mode, and judging the running state of the isolating switch according to the matching degree result.
8. The method for intelligent monitoring of an isolating switch as in claim 7, wherein S51 comprises the steps of: The data integrity check comprises traversing the original angle data, checking whether the data at each sampling moment has a defect, and if the data at each sampling moment has a defect, filling the data at adjacent moments by adopting a linear interpolation method to ensure the continuity of time sequences; Outlier rejection and correction, namely detecting outliers based on the statistics of the Grabbs criterion, calculating a data mean value and a standard deviation, rejecting data points deviating from the mean value by more than a critical value, and replacing the data points with a neighborhood mean value; And (3) suppressing time-frequency domain noise, namely performing multi-scale decomposition on the angle signal by adopting wavelet transformation, selecting Daubechies wavelet to extract low-frequency trend components, removing high-frequency noise by threshold processing, and retaining characteristic signals reflecting the mechanical motion state.
9. The method of intelligent monitoring of an isolating switch as in claim 7, wherein S52 comprises the steps of: Defining a plurality of hidden states representing the health state of the equipment; Initial state probability distribution, namely setting initial state probability distribution based on priori knowledge or historical data; The state transition probability configuration is that a state transition probability matrix is constructed; And generating an observation probability matrix, namely generating observation value probability distribution corresponding to each hidden state through a statistical modeling or parameter estimation method based on the preprocessed angle data characteristics.
10. The method of intelligent monitoring of an isolating switch as in claim 7, wherein S53 comprises the steps of: the real-time data acquisition and preprocessing, namely synchronously acquiring angle data, performing verification, interpolation and wavelet denoising, and generating a feature sequence with the same dimensionality as training data; Decoding an optimal state path, namely calculating the matching probability of the real-time characteristic sequence and each state mode by using a trained HMM model through a Viterbi algorithm, and decoding to generate an optimal state transition path; And judging the multi-level fault threshold, namely calculating the similarity between the optimal path and the normal mode, and triggering alarm in a grading way by combining a preset threshold.

Description

Intelligent monitoring system for isolating switch Technical Field The invention relates to the technical field of monitoring of isolating switches, in particular to an intelligent monitoring system of an isolating switch. Background In a railway power supply system, a contact net isolating switch is taken as indispensable key equipment, plays core roles of distributing electric energy, isolating fault areas and the like, plays a vital role in guaranteeing stable operation of the railway power supply system and safe running of a train, and the normal operation of the contact net isolating switch directly relates to the reliability and the safety of the whole railway power supply network. In the long-term operation process, the contact surface may have poor contact due to oxidation, abrasion and other factors, so that the contact resistance is increased, more heat is generated when the current passes through, the contact temperature is further increased, when the overload current occurs in a circuit, the heat generated by the contact is also increased rapidly, the contact material is damaged by high temperature, the performance change, the abrasion is aggravated, the contact resistance is further increased, and the reliability of the switch is reduced. In addition, the isolating switch runs outdoors for a long time, the environment is complex and changeable, the isolating switch is influenced by various factors such as wind blowing, sun drying, rain spraying, sand dust and the like, the transmission part is easy to fail, and the faults possibly cause that the isolating switch cannot be accurately in place during opening and closing operations due to the reasons such as rust, abrasion, clamping stagnation and the like, so that the distribution of electric energy and the isolation function of a failure area are influenced, and the reliability and the safety of a power supply system are reduced. Meanwhile, in a railway power supply system, current and voltage parameters of the isolating switch are important indexes reflecting the running state of the isolating switch, the current is directly related to the load condition of the isolating switch, overload current can cause problems of contact temperature rise, equipment damage and the like, the normal operation of the isolating switch can be influenced by the stability of the voltage, and the insulating property, the contact property and the like of the isolating switch can be damaged by the excessively high voltage or the excessively low voltage, so that the current and the voltage of the isolating switch are monitored in real time, abnormal changes of the current and the voltage can be timely found, and corresponding measures can be taken to adjust and protect the isolating switch, so that the safe and stable running of the isolating switch is ensured. In summary, a set of intelligent monitoring system for the isolating switch is developed, the running state of the isolating switch is monitored in real time, and fault early warning is performed, so that the intelligent monitoring system has important significance for improving the reliability and safety of a railway power supply system. Disclosure of Invention In order to solve the problems, the invention provides the intelligent monitoring system for the isolating switch, which can accurately discover abnormality in time through high-efficiency transmission processing of multi-source collected data and effectively improve the reliability and safety of a railway power supply system. The technical scheme of the invention is as follows: The isolating switch intelligent monitoring system comprises a data acquisition unit, a data receiving and transmitting unit, a data collecting unit, a data transmission unit and a data processing unit; The data acquisition unit is used for acquiring multi-source sensing data reflecting the operation state of the isolating switch, and the multi-source sensing data at least comprises angle data representing the mechanical position of the disconnecting link, temperature data representing the contact state of the contact and current and voltage data representing the electrical load; the data receiving and transmitting unit is connected with the data acquisition unit and is used for receiving the multi-source sensing data and performing preliminary processing; the data collecting unit is connected with the data receiving and transmitting unit and is used for receiving and collecting the data from the data receiving and transmitting unit and storing the data; the data transmission unit is connected with the data collection unit and is used for remotely transmitting the collected data to the rear end; the data processing unit is connected with the data transmission unit and is used for analyzing the received data to evaluate the running state of the isolating switch and conduct fault prediction, and generating alarm information when the abnormality is judged to exist. Further, the data