Cable Monitoring System Research Articles

An integrated environment monitoring system for underground coal mines--Wireless Sensor Network subsystem with multi-parameter monitoring.

Environment monitoring is important for the safety of underground coal mine production, and it is also an important application of Wireless Sensor Networks (WSNs). We put forward an integrated environment monitoring system for underground coal mine, which uses the existing Cable Monitoring System (CMS) as the main body and the WSN with multi-parameter monitoring as the supplementary technique. As CMS techniques are mature, this paper mainly focuses on the WSN and the interconnection between the WSN and the CMS. In order to implement the WSN for underground coal mines, two work modes are designed: periodic inspection and interrupt service; the relevant supporting technologies, such as routing mechanism, collision avoidance, data aggregation, interconnection with the CMS, etc., are proposed and analyzed. As WSN nodes are limited in energy supply, calculation and processing power, an integrated network management scheme is designed in four aspects, i.e., topology management, location management, energy management and fault management. Experiments were carried out both in a laboratory and in a real underground coal mine. The test results indicate that the proposed integrated environment monitoring system for underground coal mines is feasible and all designs performed well as expected.

The Design of Greenhouse Temperature Control System Base on SimpliciTI

The cable monitoring system of agricultural greenhouse has the problems of high power consume, high cost and the difficulty of wiring. In this paper a way to construct wireless sensor network (WSN) of star is introduced, and presents a Greenhouse Temperature Control System with SimpliciTI. The hardware modules use the ultra-low power MCU MSP430 and RF chip CC2500 as the core except for the upper computer. We firstly explain concepts and the architecture of our system and then introduce some important hardware design and the key software design in detail. Tests showed that the system can effectively control temperature, and be flexible installed in agriculture greenhouses.

Development and Application of Composite Submarine Cable Online Monitoring System

This paper focuses on the design and application of the composite submarine cable online monitoring system based on Brillouin optical time domain analysis (BOTDA). It introduces two concepts of the system: the BOTDA technology and the finite element modeling method. Using ideas of modular design, the team developed the PC software on LabWindows/CVI. At the end of the paper, it describes the application of the online monitoring system, and then analyzes the data returned from the system.

Key Technologies of On-Line Monitoring Based on Optical Transport Networks

To meet the comprehensive maintenance demand of optical fiber transportation networks, an integrated optical cable on-line monitoring system is designed in this research. The researched employs modular structure, integrated function, and blended multiple communication interfaces for the key technologies of monitoring 128 modules. By using the technologies, speech path and signaling are able to transmit simultaneously. Then the research establishes the on-line monitoring system which integrates the functions of real-time monitoring of terminal offices on optical cable line and end machine, automatic dispatching of circuits, and maintenance test for optical transportation equipment. By applying the system on-line, the research verifies that the functions and technical indexes of the system meet its design requirements.

Development and Improvement of an Intelligent Cable Monitoring System for Underground Distribution Networks Using Distributed Temperature Sensing

With power systems switching to smart grids, real-time and on-line monitoring technologies for underground distribution power cables have become a priority. Most distribution components have been developed with self-diagnostic sensors to realize self-healing, one of the smart grid functions in a distribution network. Nonetheless, implementing a real-time and on-line monitoring system for underground distribution cables has been difficult because of high cost and low sensitivity. Nowadays, optical fiber composite power cables (OFCPCs) are being considered for communication and power delivery to cope with the increasing communication load in a distribution network. Therefore, the application of distributed temperature sensing (DTS) technology on OFCPCs used as underground distribution lines is studied for the real-time and on-line monitoring of the underground distribution power cables. Faults can be reduced and operating ampacity of the underground distribution system can be increased. This paper presents the development and improvement of an intelligent cable monitoring system for the underground distribution power system, using DTS technology and OFCPCs as the underground distribution lines in the field.

Bridge Vibration and Cable Force Monitoring System Integration

Bridge Structural Health Monitoring System mainly monitors vibration and cable force of bridge. Fiber optical sensor is chosen to measure vibration and cable force, and their computing method is also given. Besides, wavelet de-noising and Multi-harmonic extraction technology is used to process data. In order to collect, analyze, display and store data, the system use LabVIEW and SQL Serve platform with multi-thread and multi-protocol technology. System regards the one Wuhan Yangtze River Bridge as real-time monitoring objects, and all the indicators have reached the design requirements.

Magnetic Flux Leakage Sensing-Based Steel Cable NDE Technique

Nondestructive evaluation (NDE) of steel cables in long span bridges is necessary to prevent structural failure. Thus, an automated cable monitoring system is proposed that uses a suitable NDE technique and a cable-climbing robot. A magnetic flux leakage- (MFL-) based inspection system was applied to monitor the condition of cables. This inspection system measures magnetic flux to detect the local faults (LF) of steel cable. To verify the feasibility of the proposed damage detection technique, an 8-channel MFL sensor head prototype was designed and fabricated. A steel cable bunch specimen with several types of damage was fabricated and scanned by the MFL sensor head to measure the magnetic flux density of the specimen. To interpret the condition of the steel cable, magnetic flux signals were used to determine the locations of the flaws and the levels of damage. Measured signals from the damaged specimen were compared with thresholds that were set for objective decision-making. In addition, the measured magnetic flux signals were visualized as a 3D MFL map for intuitive cable monitoring. Finally, the results were compared with information on actual inflicted damages, to confirm the accuracy and effectiveness of the proposed cable monitoring method.

Quantitative Analysis of Rogowski CT Frequency Characteristics

Partial discharges in power cables will generate small currents with low frequencies in the ground cords. In cable PD online monitoring systems, CTs are usually used to obtain such PD signals. In this paper, by derivations based on theories of wave propagation, the frequency characteristics of Rogowski CTs (RCTs) and the effects of transformer parameters (size, core material, etc.) on its pass band B, sensitivity H(jω0), the lower cutoff frequency fL is acquired. The feasibility of such derivations is verified by experiments. By conducting comparative experiments, the effect of the use of screening box and the way of coil winding on the performance of a current transformer is acquired. A feasible plan to improve the frequency characteristics of CTs is presented, in order to acquire more stable gain and better anti-interference ability within their pass band.

Layer Based Energy-Balanced Reliable Routing Protocol for Wireless Sensor Networks in Coal Mine

Synthetically considering the special environment underground, we combined the wireless sensor network with the existing cable mine monitoring system, forming a new monitoring system based on Ethernet and WSN, and then we put forward a layer based energy-balanced reliable routing (LBEBR) protocol for WSN to solve the spot problem in zonal area of coal mine and to ensure the reliability of data transmission. The working face was divided into several equal rectangular layers. According to the optimal cluster radius calculated before, different numbers of nodes constituted clusters of different sizes in each layer. In the stage of data transmission, using the reliability evaluation of nodes and considering three factors, the residual energy of nodes, the distance between nodes and the reliability of nodes, to select the best next-hop node. Simulation results show that the protocol can not only balance the energy of the network, but also elude problem nodes effectively to increase the reliability of data transmission.

Design of Building Fire Detection System Based on ZigBee

Comparing with other fire detection system used in buildings, this paper proposes a design scheme based on ZigBee. ZigBee is a well known wireless communication technology which is wildly used in industrial monitoring. It solves the problem of difficulty to set up the network, high cost and restricted scope in existing cable fire detection monitoring system. This system mainly comprises sensor nodes, middleware and monitoring application. We adopt MESH topology in wireless sensor networks in order to enlarge the monitoring scope. To find the accurate fire position quickly, GPS is adopted in design of sensor node. The Device Cloud is used in middleware and monitoring application to provide open APIs for web, 3G and SMS. Using these technologies the system can provide real-time fire monitoring.

The Research on Substation Monitoring System Based on Multi-Sensor Network

According to the needs of the intelligent substation construction, this paper applied the optical fiber sensor technology and wireless sensing technology in the substation monitoring, and designed the substation equipment temperature information acquisition system and communication optical cable monitoring system, which connects to the power supply bureau monitoring center networking and provides the decision-making basis for the substation state control and maintenance. It is conducive to improve the level of substation intellectualization and information sharing.

The Design and Implementation of Cable Condition Monitoring System

This paper describes the detail of design and implementation of cable condition monitoring system, including accessing and sharing of monitoring data, visualization, query, analysis and device management.

The Study on Analog Module of Underground Cables Environmental Monitoring System Based on CAN Bus

In order to online real-time monitor of underground cable tunnel environment and running state, the timely discover and preclude troubleshooting that may occur, and to ensure the safety and reliability of the cable running. This article describes the underground cable environment online monitoring system platform based on CAN bus technology, and which is in its application layer using a common international CANopen protocol. This paper focuses on the realization of analog modules. It provides timely and effective monitoring method for real-time monitoring of the underground cable environment.

Design of Cable Main Insulation and Outer Sheath Insulation Online Monitoring System

An online monitoring system of main insulation and outer sheath of power cable is designed in this paper. The system can monitor the insulation of the power cable without change the normal power cable wiring and grid structure. Changes of the main insulation and outer sheath of power cable can be monitor and recorded. Alarm of given when the insulation of the power cable is abnormal. System managers arrange outage maintenance depends on the status of the power cable.

Research on Carrier Recovery Algorithm for High-Order QAM over Digital Cable TV Monitoring System

A new structure of carrier recovery loop for high-order QAM is proposed in this paper, and applied in digital cable TV monitoring system. The structure operates in two modes with variable loop bandwidths, has the advantage of increasing convergence speed and minimizing the lock error, meanwhile, optimises the phase detection mode for the weighted DD algorithm to attain the fast recovery. Simulation results show that the algorithm is practicable and effective, and the carrier loop can capture up to 40% frequency offset of the symbol rate quickly and accurately.

Research on Design of Cable Wireless Temperature Monitoring System

In this paper, a wireless temperature monitoring system was designed for cable based on Labview software, where its designed frame form and realization method were introduced. MSP430 MCU UART serial communication and generic personal-computer was selected as the main hardware part, and a suit of monitoring-controlling user software was also developed by using the Labview. Compared to the traditional measuring system, the developed cable wireless temperature monitoring system takes on some characters, such as good maneuverability, common good, strongly functions and high of performance-price ration. Besides, the developed wireless temperature monitoring system has an automatically data sampling function and an remote on-line monitoring function in real time, which could be widely applied into temperature measurement in electric power system.

The Design of Electric Power Optical Cable Circuit Automatic Monitoring System Based on PC Computer

In view of the increasing scale of electric power optical cable and the problem that it is difficult to ensure the quality of the line, combining the actual situation of power system, using OTDR, program-controlled optical switch, PC computer to form a electric power optical cable circuit automatic monitoring system. The design make use of PC computer to control the starting and stopping of OTDR and which channel of program-controlled optical switch is to be guide circuited and receive the data of OTDR to detect the malfunction spot of fiber cable. The system provides an advanced maintenance measure for electric power optical cable, reducing the duration for repair of fiber cable troubles, can be widely used in electric power optical telecommunication network.

The Use of Partial Discharges as an Online Monitoring System for Underground Cable Joints

With their vast amount of joints, underground cable systems are expensive to maintain; therefore, measurement equipment must be cost-effective. This study proposes the long-term placement of partial-discharge (PD) monitoring units at cable joints. The unit consists of a peak detect circuit and a digital signal processor for acquiring and converting the sensors' PD signals into discharge sequence data, whose data are then provided to a remote computer for analysis and display of the condition of the cable joint. Finally, a cable joint with artificial defects was tested by accelerated aging tests to verify the performance of the equipment. Two characteristics, namely, the average discharge quantity (Qave) and the discharge phase region, are proposed and plotted against each other to render an evolution locus, which reveals a shape of an upside-down letter N. The locus allows a judgment to be made on the state of the insulation in the cable joint. These results further justify work to further develop the method as an online cable monitoring system.

A Mechanism of Initiative Transmission to Send Message on WEBGIS

The paper researched and realized the initiative message transmission mechanism of WEBGIS server based on the N layer architecture of Internet. According to WEBGIS application long business operation as well as server information visualized in client side in real-time features, this article uses the Socket communication and the client side with JAVA Applet to realize that the WEB server can send message initiative to the client. It comes up and realizes a concrete plan of initiative transmission mechanism in WEBGIS. We run the realization plan based on Winsock through the project practice of Guangzhou cable TV network security monitoring and alarm system. The system operation has been verified in system running. The combination of this mechanism with conventional WEBGIS can greatly improve the performance and the usability of WEBGIS.

On-line partial discharge monitoring in medium voltage underground cables

For many years incipient partial discharge (PD) faults in power cables have been identified through off-line investigation techniques. More recently, in an effort to allow pro-active asset management of the medium-voltage (MV) cable network to be carried out, continuous on-line monitoring systems are being installed with the aim of reducing unexpected failures. This study presents work on the analysis and handling of acquired data, from the point of view of asset management and the PD activities observed in an on-line cable monitoring systems. Initially, a review of on-line against off-line cable PD monitoring is presented, in terms of their setups and their respective advantages and disadvantages. The study then presents the authors’ experience of applying wavelet-based denoising techniques [both the discrete wavelet transform (DWT) and the second generation wavelet transform (SGWT)] to PD data denoising. Results of a study on the on-line PD-based monitoring of MV underground cables that are presented in the following section demonstrate that PD activity which is observed in on-line monitoring also has an associated high level of electrical noise that must be removed to allow proper identification of the PD signals and the denoised PD activity is seen to vary with time. Finally, the necessity of developing a means by which knowledge rules can automatically be acquired from on-line condition monitoring data, to reduce reliance on human expertise, is discussed.