The system has real-time storage, playback, retrieval, and query functions. On-duty personnel can always pay attention to the construction situation inside and outside the cave, so as to achieve anytime, anywhere (Remote access by mobile phone can be realized) Timely and accurately supervise it to protect the safe construction of the tunnel. Its physical structure is divided into three parts: image acquisition terminal, data transmission, and monitoring center. The collection terminal is responsible for image information collection, and digitally compresses and encodes the collected images into digital signals, and transmits the digital information to the monitoring center through a wireless network bridge. The video monitoring system of the monitoring center analyzes the digital signals and monitors them. The implementation screen is displayed.
The intelligent manhole cover monitoring system uses the current advanced wireless communication technology, power supply technology, and sensor technology to incorporate the state of the manhole cover, the state of the underground environment, the opening of the manhole cover, and the inspection of the manhole cover into the unified maintenance management system, and establish the corresponding alarm processing Mechanism, the status of the manhole cover and the alarm content are displayed through the electronic map. If the manhole cover is stolen or damaged, the monitoring personnel can go to the scene to deal with it in time and quickly Resolve safety hazards. The system can realize the data collection, real-time display, diagnostic analysis, fault alarm of various security signals of the manhole cover, so that the dispatch center, operation and maintenance station, and management departments can intuitively understand and master the operation of the underground pipeline network
The high-voltage cable metal sheath circulating current suppressor is divided into two parts, the first part is the inductance that suppresses the circulating current; the second part is the zinc oxide valve plate with protective function. When the power cable is working normally, the suppressor can effectively suppress the current of the metal sheath of the cable. When the core current increases, or when a single-phase short circuit occurs, the voltage across the inductor increases. When the voltage exceeds the protector withstand voltage, the protection The device operates to leak the induced current into the ground through the protector and clamp the voltage across the inductor in time to avoid injury to the operator and heat damage to the inductor.
The V500 series of fiber-optic vibration intrusion monitoring products use the phase and intensity of the back-to-Rayleigh scattered light transmitted in the optical fiber to obtain relevant information about external disturbance events, and determine the disturbance position according to the time delay of the incident light and the probe light. So as to realize the long-distance distributed disturbance monitoring and alarm. This system is composed of AV500 series optical fiber vibration intrusion monitoring host, disturbance detection optical cable, monitoring management software and related accessories. It can detect intrusion behavior in real time and intelligently identify the location of intrusion through the detection optical cable laid on the monitoring defense line, providing a powerful way to prevent illegal intrusion. Guaranteed.
JC-OM300 distributed optical fiber temperature measurement system adopts high-quality pulse light source, light receiving equipment and high-speed signal acquisition and processing technology to obtain accurate temperature values at all points along the optical fiber. It is currently the best performance and most advanced technology distributed optical fiber temperature measurement system.
The system is mainly composed of an online monitoring device for cable insulation and an online monitoring device for cable sheath circulation. The cable insulation online monitoring device is mainly based on the improved dielectric loss factor method + DC component method, which gives an early warning to the insulation of the cable so that the cable can be replaced in time. When the cable line fails, the device can identify the faulty branch online. After determining the faulty branch, the cable fault tester is used to accurately locate the fault point in offline mode. The cable sheath circulating current monitoring device monitors the insulation performance of the high-voltage cable in real time based on the cable sheath ground current monitoring data to prevent cable faults caused by the formation of multi-point grounding, cable breakdown, cable aging, and damage.
The tunnel integrated online monitoring system mainly consists of a distributed optical fiber temperature measurement system, a tunnel environment integrated monitoring system and a tunnel integrated monitoring center platform. It uses modern high-tech electronic technology, sensor technology, computer network technology, communication technology, and embedded technology. Collect and analyze data of cable tunnel environment, equipment and facilities, realize remote monitoring of cable tunnel equipment, and have the functions of data communication, data query, and parameter setting management.
The automatic cable fault location and circulating current monitoring system implements online monitoring for ultra-high voltage cable lines with voltage levels of 110kV and above to realize automatic location of ultra-high voltage cable faults. In addition, the system monitors the circulating current value of the metal shielding layer of the cable in real time, can draw the cable circulating current curve, and alarm the abnormal circulating current cable to realize the online monitoring of the cable sheath insulation. The positioning accuracy of the system is not affected by factors such as line fault location, fault type, line length, grounding resistance, etc. The monitoring data is reported to the host computer through optical fiber communication, and the location of the fault point is determined by the host computer analysis software, which shortens the user's fault diagnosis time and Time to restore line power
The monitoring device equipped with this system adopts CT induction power supply mode for power supply, which is easy to install. After being put into operation, it can independently monitor the grounding wire circulation, cable (joint) temperature, cable vibration and other data, and at the same time send the data to the remote monitoring center. Once the data is found to be abnormal, the monitoring center will notify relevant personnel to deal with it in a timely manner through warning lights, siren, SMS, WeChat, etc.
The high-voltage cable grounding circulation monitoring system is composed of a signal monitoring unit, a data communication unit, and a local sensor unit. It completes the environmental temperature and humidity detection of the high-voltage cable grounding circulation and the grounding box, and transmits the data to the local monitoring panel through the RS485/IEC61850 communication module. The monitoring terminal uses advanced measurement circuits, high-speed MCUs, and stable and reliable sensors to achieve accurate measurement of monitoring signals and reliable data transmission.
The system uses the thermal network method based on Ohm's law of the heat flow field to calculate the current carrying capacity of the cable. The concept is clear and easy to understand and master. It can not only be used to solve the thermal field of the cable, but also can be used to obtain the cable conductor temperature in the case of monitoring the surface temperature of the cable, or calculate the ambient temperature at this time according to the actual load and surface temperature of the cable, so as to obtain the current environment The rated load of the cable under the conditions. The use of this software for cable selection calculation and operation verification is convenient, fast and accurate. It not only saves a lot of time for cable selection and maintenance personnel, but also provides a reliable basis to make the selection and control of the cable operation status more accurate , It is also very helpful to the evaluation of the operating life of the cable.
This system is suitable for comprehensive monitoring of the operating status of power cables of 110KV and above, supports GPRS network, provides real-time monitoring data to maintenance personnel, reduces the workload of inspection personnel, and achieves early warning for long-term changes in monitoring points. Prevent emergencies from happening. Real-time understanding of the operating status of the high-voltage cable, by monitoring the partial discharge of the cable, the circulating current of the cable's high-voltage sheath, and the cable optical fiber temperature measurement system (DTS), and on this basis, the real-time core current carrying capacity is analyzed, and the operating status of the cable is monitored. Provide reliable data for maintenance personnel. Through GPRS, CDMA and other wireless transmission methods, the relevant data such as partial discharge, temperature and circulation are transmitted to the back-end server, and then forwarded to the handheld terminal through the server, so that the operation and maintenance personnel can keep abreast of the operation of the cable at any time. Through the three aspects of data, more Effectively judge the running status of the cable.
The JC-OM400D cable partial discharge online monitoring system adopts a modular design scheme. The partial discharge pulse current signal at the cable body and the joint is coupled through the high-frequency pulse current sensor installed on the ground wire of the cable joint; the coupled pulse current The signal is transmitted to the front-end monitoring collector through the coaxial cable, and the analog signal is amplified, filtered, and converted into a digital signal, and then transmitted to the back-end server through the optical fiber. The background server performs classification, identification, analysis, and calculation on the signals of all sensors, and writes the discharge information data obtained through calculation into the database, and displays the monitoring results on the software of the monitoring system.
The point-type optical fiber temperature sensing system uses the principle of fluorescence detection to monitor temperature information through optical fibers. It is suitable for temperature sensing monitoring in areas with high temperature monitoring accuracy and narrow spaces, such as switch cabinet contacts, motor stators, transformer windings, etc. Most of these monitored equipment have relatively harsh electrical environmental conditions (electromagnetic field radiation, surges, electrical pulses and other electromagnetic interference), and optical fibers have the characteristics of electrical insulation, intrinsic safety, and immunity to electromagnetic interference, so the probe of the optical fiber sensor can be directly It is installed on the measured point in a contact manner, and monitors the temperature of these devices at "zero distance" to ensure real-time and accurate temperature detection.
The cable is a facility with a high probability of failure of the cable network. The signal of the sensor coupling cable grounding wire, the partial discharge of the sensor to the cable joint and the distributed optical fiber temperature measurement system are used to monitor the cable and collect the ground current collected. The parameters, partial discharge parameters and cable temperature parameters are transmitted to the monitoring center to analyze and evaluate the operating status of the cable to realize the monitoring of the operating status of the cable from time to time, so as to provide a powerful guarantee for the power sector to effectively prevent accidents and disasters.