Electricity information acquisition terminal power supply and metering unit protection circuit

A measurement unit and collection terminal technology, applied in the field of power supply and metering system security protection, can solve problems such as power user loss, terminal component burnout, printed circuit board damage, etc., achieve high impact resistance capacity, suppress lightning surges, reduce the effect of interference

Inactive Publication Date: 2016-10-12
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a power supply and metering unit protection circuit for the power consumption information collection terminal in the prior art, so as to solve the problem that the terminal power supply and the metering unit of

Method used

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  • Electricity information acquisition terminal power supply and metering unit protection circuit
  • Electricity information acquisition terminal power supply and metering unit protection circuit
  • Electricity information acquisition terminal power supply and metering unit protection circuit

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Embodiment Construction

[0029] A power supply and metering unit protection circuit for electricity consumption information collection terminal (see figure 1 ), the AC input terminal is connected to the common mode choke coil, the output terminal of the common mode choke coil is connected in parallel with the Datong flow varistor, the output terminal of the common mode choke coil is connected to the low resistance high power thermistor, the low resistance value is large The output terminal of the power thermistor is connected with the fast-response thermistor, the fast-response thermistor is connected with the rectifier unit, the rectifier unit is connected with the overvoltage limiter output unit, and the overvoltage limiter output unit is connected with the high-frequency switch conversion and control unit .

[0030] The above circuit is used for the protection circuit of the power input and sampling part of the metering automation terminal of the three-phase four-wire system and the three-phase thr...

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Abstract

The invention discloses an electricity information acquisition terminal power supply and metering unit protection circuit. AC input ends are connected with common-mode chokes; output ends of the common-mode chokes are connected with high-throughput piezoresistors in parallel and are connected with low-resistance and high-power thermistors; the output ends of the low-resistance and high-power thermistors are connected with fast reaction piezoresistors; the fast reaction piezoresistors are connected with a rectifier unit; the rectifier unit is connected with an overvoltage amplitude limiting output unit; and the overvoltage amplitude limiting output unit is connected with a high-frequency switch conversion and control unit. The technical problems that a terminal is scrapped to bring losses to a user and the like since the electricity information acquisition terminal power supply and metering unit protection circuit in the prior art is easily damaged under a lightning impulse, a terminal component can be burnt out and a printed circuit board can be damaged are solved.

Description

technical field [0001] The invention belongs to the power source and metering system safety protection technology of an electric power user's metering automation terminal, and in particular relates to a power source and a metering unit protection circuit of a power information collection terminal. Background technique [0002] With the continuous popularization of smart grids, metering automation terminals are widely used. However, during the thunderstorm season, the power distribution network near the terminal is likely to be directly impacted by lightning. Such a result is likely to damage a large area of ​​nearby metering automation terminals, such as concentrators, load management terminals or distribution transformer monitoring and metering terminals. Wait. In the actual field, the main part of various terminals damaged by lightning impact is often the front-end part of the power supply of the terminal, which may cause serious consequences such as burning of terminal c...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H9/02H02M1/12H02J3/01
CPCH02H9/02H02H9/045H02J3/01H02M1/12Y02E40/40
Inventor 张秋雁徐宏伟丁超杨婧李鲁智
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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