GPS clock signal based high voltage capacitive apparatus insulated on-line monitoring system and its implement method

Abstract

The invention provides a GPS clock signal-based high voltage capacitive equipment insulation online monitoring system, including an on-site monitoring unit comprising a CPU, a wireless communication module which is 2.4GHz wireless communication module, a GPS clock receiving module, and a on-site monitoring current unit and a on-site monitoring voltage unit installed on the same bus line, and a station terminal control computer. An insulation online monitoring method includes that: the station terminal control computer sends synchronous remotely collection order to each on-site monitoring unit via 2.4GHz wireless network; each on-site monitoring unit receives GPS clock signal and realizes synchronous remotely collection of each on-site monitoring unit on the booking time, comparing the uploaded information, calculates equivalent capacitor, end screen current and dielectric loss factor of high voltage capacitive equipment after the each on-site monitoring unit obtains end screen current signal with clock signal or sequence number and PT secondary side voltage signal.

Description

technical field [0001] The invention relates to the field of on-line monitoring of high-voltage electrical equipment insulation, in particular to an on-line monitoring system of high-voltage capacitive equipment insulation based on a GPS clock signal and an implementation method thereof. Background technique [0002] High-voltage electrical equipment such as capacitive current transformers, capacitive bushings, capacitive voltage transformers, coupling capacitors, and lightning arresters in power systems are affected by factors such as strong electric fields, mechanical forces, chemical corrosion, and the environment during long-term operation. The insulation performance will gradually age, which will lead to equipment failure and threaten the safe operation of the power system. The dielectric loss factor can reflect the insulation performance of the above-mentioned equipment. By monitoring the phase difference between the terminal current of the capaci...

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Problems solved by technology

This system adopts the method of synchronous sampling based on the GPS clock, and uses the GPRS wireless service of mobile communication for wireless network communication, which can realize synchronous acquisition in different places and solve the problem of wireless communication between the tester and the central computer. However, there are still obvious shortcomings: since this method does not monitor the voltage signal applied to the measured capacitive device, it cannot monitor the real dielectric loss factor of the measured device, but can only monitor the relative change trend of its insulation parameters; Since the monitoring value is only the relative dielectric loss of the equipment, the relative dielectric loss of the same type and batch of equipment in the substation can only be compared horizontally to determine whether there is a fault in the equipment, but not for all different types of equipment in the substation. , different batches of capacitive equipment are monitored synchronously, and because the insulation parameter value of each monitoring is uncertain, it is impossible to make a longitudinal comparison of the insulation state of a specific capacitive equipment; moreover, because this method only belongs to portable measurement The system is only temporarily built on the site during measurement, rather than permanently installed on the substation site, so the system cannot continuously monitor the insulation level of the substation's internal equipment, so as to detect the insulation hazards of the capacitive equipment early. Therefore, this technology is difficult Meet the requirements for on-line monitoring of high-voltage electrical equipment insulation

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