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Middle-high voltage series-connection electronic switch

An electronic switch, medium and high voltage technology, applied in the field of new electronic switches, can solve the problems of high power consumption of the resistance-capacitance branch, large current impact, and difficulty in design, achieving a high degree of self-adaptation, low power consumption, and satisfying The effect of short-term voltage shock absorption

Active Publication Date: 2012-10-03
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But on the contrary, the larger the capacitance, the greater the power consumption of the RC branch, and the smaller the resistance, the greater the current impact when the capacitor is discharged. It is difficult to achieve both in design.

Method used

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  • Middle-high voltage series-connection electronic switch

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Embodiment Construction

[0029] Such as figure 1The application of the solid-state electronic switch in the power system is shown. The main power supply and the backup power supply are respectively connected to the load through the solid-state electronic transfer switch. Under normal circumstances, the system runs on the main power supply side. When the voltage drops, The system automatically switches the load to the backup power source through the solid-state electronic transfer switch. When the main-side power supply returns to normal, it will automatically switch back to the main-side power supply, thereby realizing effective control of power quality.

[0030] Such as figure 2 As shown, it is the circuit topology of the existing dynamic voltage equalizing circuit of series electronic switches, and its dynamic voltage equalizing function is composed of capacitor C1 and resistor R1. In a series configuration, the turn-on time of the main electronic switches varies. This leads to uneven voltage d...

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Abstract

A middle-high voltage series-connection electronic switch comprises a main electronic power switch module, a basic dynamic voltage-sharing resistance-capacitance branch formed by a non-polarized capacitor (C1) and a resistor (R1) in series connection, an H bridge diode rectifying module, an attached dynamic voltage-sharing resistance-capacitance branch, a discharging resistor and a surge absorption module, wherein the input end of the H bridge diode rectifying module is connected with the basic dynamic voltage-sharing resistance-capacitance branch, the output end of the H bridge diode rectifying module is connected with the attached dynamic voltage-sharing resistance-capacitance branch, two ends of the attached dynamic voltage-sharing resistance-capacitance branch are further connected with a surge absorption module metal oxide varistor (MOV) in parallel, the attached dynamic voltage-sharing resistance-capacitance branch is formed by a capacitor (C2) and a current-limiting resistor (R2) in series connection mode, and two ends of the capacitor (C2) are further connected with the discharging resistor (Rp) in parallel. The middle-high voltage series-connection electronic switch enables a system to meet general dynamic voltage-sharing requirements and meet requirement for short-time voltage shock absorption under the condition of not adding resistance-capacitance branch power consumption, and is long in service life and high in self-adaption degree.

Description

technical field [0001] The invention relates to an electronic switch, in particular to a novel electronic switch applied to medium and high voltage power systems. Background technique [0002] With the continuous development of fine chemicals and high-tech industries, users have different levels of demand for power quality, and power quality problems have a huge impact on sensitive loads. Voltage, frequency, and waveform are standards for measuring power quality. Frequency or voltage deviation or waveform distortion beyond a certain range will have adverse effects on the safety and economic operation of power users and the power grid. Voltage dips and short-term voltage interruptions account for about 90% of all power quality problems. When the voltage is lower than 90% of the rated value, the operation of sensitive loads will be affected, resulting in huge safety hazards and economic losses. Therefore, controlling voltage dips and short-term voltage interruptions and impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/687
Inventor 翁洪杰姚佳徐柏榆陈蓓蓓朱良合
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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