Device for monitoring overhead wire load currents

Abstract

The invention provides a device for monitoring overhead wire load currents. The device comprises a monitor arranged outside an overhead conductor. The monitor is of a split structure and is composed of an upper monitor part and a lower monitor part. The monitor is provided with a sampling silicon steel iron core, a sampling and communication circuit board, an induction energy-extracting circuit board and an induction energy-extracting silicon steel iron core. An outer shell of the lower monitor part and an outer shell of the upper monitor part are sleeved with silica gel sheaths, flexible solar panels are arranged on the outer circumferences of the silica gel sheaths, and solar terminal connecting holes are formed in the silica gel sheaths. The outer shell of the lower monitor part and the outer shell of the upper monitor part are connected through bolts. According to the device for monitoring the overhead wire load currents, data are transmitted in a wireless mode, primary isolation and secondary isolation are achieved, the flexible solar panels are embedded in the silica gel sheaths, sampling coils are provided with taps, when values of the load currents are as small as set values and the load currents are switched to high-accuracy coils, the taps are automatically switched, sampling accuracy is improved, and electric power runtime is long.

Description

technical field [0001] The invention relates to a current monitoring device, in particular to an overhead line load current monitoring device. Background technique [0002] At present, my country and foreign countries are monitoring the load current of overhead lines. Only a few pilot areas use insulators with current transformers as sampling units, and the secondary leads are led down from the crossarms where the insulators are installed. A dedicated sampling box is introduced to send the data to the master unit. In some very developed areas, a two-phase or three-phase current transformer is installed at the switch on the pole as a sampling unit, and the current data is sent to the main station through the FTU. [0003] The load monitoring system using insulators with lead wires has the advantage of being cheap, but has many disadvantages, such as: it must be installed with a bracket, the maintainability is poor, and the ability to withstand lightning impact is poor. Once ...

AI Technical Summary

Problems solved by technology

[0003] The load monitoring system using insulators with lead wires has the advantage of being cheap, but has many disadvantages, such as: it must be installed with a bracket, the maintainability is poor, and the ability to withstand lightning impact is poor. Once it is broken down, it must be powered off for maintenance. Isolation, the risk of a primary failure is likely to be transmitted to the secondary, burning the secondary components, which brings a lot of inconvenience to the system

[0004] Installing a current transformer at the switch on the pole is only used in a sufficiently developed area. The complete system composed of the switch on the pole and the FTU is very expensive and requires a lot of maintenance. After a failure, the power must be cut off for maintenance.

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