The invention relates to an electrical equipment local discharge positioning method and system. The method comprises the following steps of selecting one of a plurality of wireless sensors as a master clock and the other wireless sensors as slave clocks, and synchronizing the time of the master clock and the slave clocks; controlling the master clock to transmit a synchronous measurement instruction, and enabling the slave clocks to synchronously collecting ultrasonic signals generated in an electrical equipment measuring position at the same time with the master clock after receiving the synchronous measurement instruction; obtaining the head wave time of the ultrasonic signals in a wireless mode, which is recorded by a local discharge pulse time extracting module in every wireless sensor, selecting the shortest four head wave times, and according to the four head wave times and the positions of the corresponding wireless sensors determining the local discharge position of electrical equipment. By achieving ultrasonic collection and positioning through the wireless sensors, the electrical equipment local discharge positioning method is low in workload and high in safety.

Electrical equipment local discharge positioning method and system

The utility model discloses an electric power switch cabinet wireless monitoring system. The electric power switch cabinet wireless monitoring system comprises a personal computer (PC), a major node and an auxiliary node. The PC is connected with the major node through recommended standard 232 (RS232), and the major node is connected with the auxiliary node through wireless network. Through the electric power switch cabinet wireless monitoring system, temperature, humidity, electric current, voltage and the like in the electric power switch cabinet can be monitored on-line and in real time and transmitted long-distance, and meanwhile failure warning and disposal can be done, monitoring requirements of the electric power switch cabinet can be effectively met, and stable operation of the electric power switch cabinet is guaranteed. The electric power switch cabinet wireless monitoring system has the advantages of being simple in structure, convenient to operate and maintain, high in automation level, low in use cost, high in measurement accuracy, and superior in performance.

Electric power switch cabinet wireless monitoring system

The invention discloses a universal wireless data acquisition device and method. The device comprises a data acquisition module, a data receiving module and a host computer, wherein the data receiving module is used for receiving data transmitted from the data acquisition module and is used for transmitting the data to the host computer through a serial port; the data acquisition module comprises a singlechip system as well as a transmitting circuit, a universal data acquisition interface, a power supply module and a power down protection module connected with the singlechip system; the data receiving module comprises a singlechip system as well as a receiving circuit and a host computer connected with the singlechip system. The invention further relates to a universal wireless data acquisition. By adoption of the device and the method, the operation state of production line equipment can be monitored in real time, the production efficiency is improved, the security of a production workshop is improved, a production line is automatically monitored in a remote distance, and the device and the method can be widely applied to wireless acquisition and processing analysis on various normal data of production lines of enterprises.

Universal wireless data acquisition device and method

The invention discloses a multi-channel ultrasonic detection-based gas insulated switchgear fault source location method. A plurality of ultrasonic detection units are mounted on the housing of a GIS (gas insulated switchgear) to be detected according to a certain rule to monitor ultrasonic signals during a voltage-withstanding test or equipment operation, and a wireless transmission module is then utilized to transmit a measurement result to a background system in a safe area. When the equipment generates an abnormal signal or breakdown takes place, the multi-channel ultrasonic signal is analyzed and processed, so that the position with the abnormal ultrasonic signal or the faulty breakdown point can be accurately located within 50cm. the system does not change the original wiring and operation mode of the GIS, and is convenient to install and operate, and the fault source location effect is remarkable.

Multi-channel ultrasonic detection-based gas insulated switchgear fault source location method

The invention discloses a new processing technology for improving insulation resistance of a dry transformer iron core, which includes changing structure of an epoxy plate and adding an insulation material between the iron core and the ground and has the advantages of reducing partial discharge caused by magnetic flux leakage of the iron core or defective insulation, reducing vibration of the iron core and lowering noise of the transformer and guaranteeing reliable insulation of the transformer The invention further discloses a new online monitoring test system for the dry transformer, which mainly comprises a waveguide tube, a sonic sensor, a head amplifier, a filter and an oscilloscope, wherein the sonic senor and the filter can eliminate noise of the grounding end and interference caused by vibration of the iron core and avoid false alarm, and the waveguide tube can transmit sound wave so as to eliminate affection of discharge of high-tension coil to the sensor In addition, the system can be used for measuring the distance between a partial discharge source and the center of the waveguide tube so as to position the discharge source

Kai Zhang

Papers

Ultrasonic detection device for partial discharge of switchgear based on wireless network