CN-121999585-A - Electrical early warning protection method and system

CN121999585ACN 121999585 ACN121999585 ACN 121999585ACN-121999585-A

Abstract

The invention provides an electrical early warning protection method and system. The invention belongs to the technical field of electric early warning, and by means of real-time monitoring and intelligent early warning, potential faults are found in advance, and accidents such as electric fire and equipment damage are prevented. The safety of personnel life and property is effectively protected, and the accident risk is reduced. And equipment faults are found and processed in time, equipment is prevented from being in an abnormal operation state for a long time, and the service life of the equipment is prolonged. The maintenance cost of the equipment is reduced, and the operation efficiency of the equipment is improved. Through the remote monitoring and data analysis functions, centralized management and optimized dispatching of the electrical equipment are realized. The management efficiency is improved, the manual inspection workload is reduced, and the management cost is reduced. And the redundancy design and the self-diagnosis function are adopted, so that the reliability and fault tolerance of the system are improved. The stable operation of the system under the complex environment is ensured, and the misoperation and the missing action are reduced.

Inventors

Liang jiong
HUI ZHIJUN
YUE JINFU
WEI ZHANHAI
XU HUITAO
WANG SIXIA
ZHANG JUNHUI
LIU WENXIANG
YAN HONGJUN
XU RONGBIAO
ZOU ZHIPING
YAN JIE
YANG RUI

Assignees

华能澜沧江水电股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260106

Claims (10)

1. An electrical early warning protection method is characterized by comprising the following steps: acquiring current, voltage, temperature and leakage parameters of the electrical equipment in real time through a sensor to acquire the running state of the equipment; Converting analog signals acquired by the sensor into digital signals, preprocessing the digital signals, and transmitting preprocessed data to a central monitoring system by adopting a wireless or wired communication technology; Receiving and storing data from each sensor by using a central monitoring system, and monitoring the running state of the electrical equipment in real time; Analyzing the collected data based on the running state to identify a potential fault mode, judging the fault type and the severity, and simultaneously, carrying out accurate diagnosis of the fault based on big data analysis and a machine learning algorithm to obtain diagnosis information; And carrying out early warning according to the diagnosis information by a preset early warning method, and protecting the electrical equipment by a preset electrical equipment protection method.
2. The electrical concealment fault pre-warning method as in claim 1 wherein said sensor comprises: the current sensor monitors current change in the electric circuit in real time and detects overload and short-circuit faults; the voltage sensor is used for monitoring the voltage condition of the electrical equipment and detecting voltage abnormality; The temperature sensor is arranged at a key part of the electrical equipment, monitors the running temperature of the equipment and prevents overheat faults; detecting leakage current in an electric circuit, and preventing fire accidents caused by leakage; And the insulation aging sensor detects the electrical property change of the insulation material to discover insulation aging faults in advance.
3. The electrical concealed fault pre-warning method of claim 1, wherein the pre-warning method comprises: the audible and visual alarm is used for sending out audible and visual alarm signals when the potential faults are detected, so as to remind field personnel of paying attention; the short message and mail notification, namely sending the fault information to maintenance personnel through the short message or mail to ensure timely response; And the remote monitoring terminal supports remote checking of the running state and alarm information of the equipment through a mobile phone or a computer.
4. The electrical concealment fault pre-warning method as in claim 1, wherein said electrical equipment protection method comprises: When serious faults are detected, the circuit breaker and the relay automatically cut off the power supply, so that the safety of electrical equipment and personnel is protected; the redundancy design is that a double-loop power supply and redundancy control unit is adopted, so that the reliability and fault tolerance of the system are improved; And the self-diagnosis function is that the system periodically self-checks, finds out self faults in time and alarms, thereby ensuring the normal operation of the system.
5. The electrical concealment fault pre-warning method as in claim 1, further comprising: Based on the running time t and the failure occurrence rate lambda, the system reliability R is calculated, and the calculation formula is as follows: Wherein lambda is determined by historical fault statistics and t is recorded by the synchronous time service module.
6. An electrical early warning protection system, comprising: the multi-physical quantity sensor array is used for collecting current, voltage, temperature, electric leakage and insulation aging parameters; the analog front end module is used for isolating, amplifying and filtering the sensor output; the data acquisition and processing module comprises a synchronous sampling analog-to-digital converter and a digital signal processor and is used for carrying out vector calculation, harmonic analysis and feature extraction on acquired data; The communication gateway module supports Wi-Fi six, cellular Internet of things and RS-four-eight-five access modes, encrypts the message and forwards the message to the central monitoring system; the central monitoring system is used for storing data, executing a machine learning algorithm and generating an early warning instruction; and the protection executing device is used for cutting off a fault loop and giving out audible and visual alarms according to the early warning instruction.
7. The electrical early warning protection system of claim 6, wherein the multi-physical quantity sensor array is composed of rogowski coils, voltage transformers, thermistors, residual current transformers and dielectric breakdown monitoring electrodes, and the outputs of the sensors are connected to the same analog front end module through photoelectric isolators.
8. The electrical early warning protection system of claim 6, wherein the analog front end module comprises a chopper-stabilized amplifier, a fourth-order butterworth filter, a surge suppressor, and a transient suppression diode, and wherein the gain is set using a precision thin film resistor network.
9. The electrical early warning protection system of claim 6, wherein the data acquisition and processing module comprises a twenty-four bit synchronous sampling delta-sigma analog-to-digital converter, a direct memory access controller, and an integrated digital signal processing core that performs linear phase decimation filtering and outputs Irms, vrms, total harmonic distortion, power factor, and spectral energy vectors.
10. The electrical early warning protection system of claim 6, wherein the communication gateway module automatically switches access modes according to link quality and employs a transport layer security-three protocol and elliptic curve encryption mechanism to securely encrypt messages.

Description

Electrical early warning protection method and system Technical Field The invention relates to the field of electric early warning, in particular to an electric early warning protection method and system. Background As an important guarantee means for the safe operation of an industrial electrical system, the electric early warning protection is widely applied to the fields of electric power, manufacturing, communication and the like. With the continuous development of sensor technology, automation control and communication technology, an electrical early warning system gradually evolves from traditional overload and short-circuit protection to intelligent and integrated directions. In the related technology, a complete technical system for covering data acquisition, feature extraction, fault diagnosis and early warning control is constructed through the collaborative operation of multi-physical quantity monitoring, edge calculation and cloud analysis. Specifically, the system covers the whole process from real-time acquisition of electrical parameters, signal processing, communication transmission to intelligent analysis and protection execution, including synchronous monitoring of key parameters such as current, voltage, temperature, electric leakage and the like, and the core links such as fault mode identification based on machine learning, multichannel data fusion analysis and the like. However, in the existing electrical early warning method, a fixed threshold value and a scalar monitoring means are directly adopted, and consistency analysis of vector phasors of multiple physical quantities is not realized, so that identification delay and even missed detection of hidden faults such as insulation aging and poor contact can be caused. Specifically, the traditional system responds after the fault occurs, lacks the capability of dynamic modeling and early warning of the fault evolution process, and is difficult to implement effective intervention before arc flash energy is accumulated. The fault detection delay generally exceeds 1800 ms, the false alarm rate is as high as 3.2%, data among different devices cannot be shared, the system integration level and the reliability are insufficient, and the system is easily influenced by factors such as electromagnetic interference, environmental fluctuation and the like, so that misoperation or missing actions are frequently generated, and the safe operation and maintenance efficiency of an electrical system are influenced. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide an electrical early warning protection method. A second object of the present invention is to provide an electrical early warning protection device. To achieve the above objective, an embodiment of a first aspect of the present invention provides an electrical early warning protection method, including: acquiring current, voltage, temperature and leakage parameters of the electrical equipment in real time through a sensor to acquire the running state of the equipment; Converting analog signals acquired by the sensor into digital signals, preprocessing the digital signals, and transmitting preprocessed data to a central monitoring system by adopting a wireless or wired communication technology; Receiving and storing data from each sensor by using a central monitoring system, and monitoring the running state of the electrical equipment in real time; Analyzing the collected data based on the running state to identify a potential fault mode, judging the fault type and the severity, and simultaneously, carrying out accurate diagnosis of the fault based on big data analysis and a machine learning algorithm to obtain diagnosis information; And carrying out early warning according to the diagnosis information by a preset early warning method, and protecting the electrical equipment by a preset electrical equipment protection method. In one embodiment of the invention, the sensor comprises: the current sensor monitors current change in the electric circuit in real time and detects overload and short-circuit faults; the voltage sensor is used for monitoring the voltage condition of the electrical equipment and detecting voltage abnormality; The temperature sensor is arranged at a key part of the electrical equipment, monitors the running temperature of the equipment and prevents overheat faults; detecting leakage current in an electric circuit, and preventing fire accidents caused by leakage; And the insulation aging sensor detects the electrical property change of the insulation material to discover insulation aging faults in advance. In one embodiment of the present invention, the early warning method includes: the audible and visual alarm is used for sending out audible and visual alarm signals when the potential faults are detected, so as to remind field