Capacitive power supply method and device based on high-voltage electric field

Abstract

The invention discloses a capacitive power supply method and a capacitive power supply device based on a high-voltage electric field. According to a theory that the high-voltage electric field exists between two phases of a high-voltage line or between a high-voltage power transmission line and the ground, a metal body with a proper size is put at a proper distance position between the two phases of the high-voltage line or between the high-voltage power transmission line and the ground, so that two series equivalent capacitors are formed between the metal body and the two phases of the high-voltage line, or two series equivalent capacitors are formed between the metal body and the high-voltage power transmission line as well as between the metal body and the ground; energy of the electric field can be obtained by voltage share of the two series equivalent capacitors; the obtained energy is stored and accumulated; and when reaching a certain value, the accumulated electric energy is supplied to loads with low power consumption, such as a micro processor, a wireless transceiver and the like. A new technical measure is supplied to solving the problem of power supply to high-voltage accessory equipment; the device has a simple structure and a small volume, and is portable; the method is easy to implement; and the high-voltage line safety rule can be met.

Description

technical field [0001] The invention belongs to the technical field of power electronics and power equipment monitoring, in particular to a capacitive power supply method and device based on a high-voltage electric field. Background technique [0002] In the field of power equipment monitoring, especially the status monitoring of high-voltage lines (including high-voltage transmission lines and high-voltage line bars), how to supply power to high-voltage line auxiliary equipment has always been a thorny issue. In existing systems, current sensing or battery power supply and photovoltaic cells are generally used to supply power to the system, but the former is strongly affected by the current flowing through the high-voltage line, that is, the energy provided by the power supply also changes drastically with the change of the user's power consumption. ;Although the battery power supply is not affected by high-voltage equipment, due to the limitation of battery life, regular p...

AI Technical Summary

Problems solved by technology

In existing systems, current sensing or battery power supply and photovoltaic cells are generally used to supply power to the system, but the former is strongly affected by the current flowing through the high-voltage line, that is, the energy provided by the power supply also changes drastically with the change of the user's power consumption. ;Although the battery power supply is not affected by high-voltage equipment, due to the limitation of battery life, regular power outages are required to replace the battery for the system; while the solar battery has the advantage of stable battery power supply, but it will be affected by the environment and is very suitable for open-air environments. However, this power supply method is obviously not advisable in an indoor environment or in a high-voltage switch cabinet, and the scope of application is quite limited.

Therefore, in the high-voltage power system, it is difficult to obtain the working energy of the measurement system. It must be stable and have a long enough service life. However, the current power supply methods cannot solve this problem well.

From the perspective of reducing system power consumption, with the development of technology, many companies such as Linear, TI and other companies have introduced ultra-low power consumption series single-chip microcomputers, wireless modules and energy harvesting chips for collecting weak energy and their solutions. The application of these ultra-low power consumption products greatly reduces the power consumption of the system and the power demand of high-voltage line auxiliary equipment, but this can only alleviate the power supply contradiction but cannot completely solve the current problem of powering high-voltage line auxiliary equipment

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