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Ferroresonance-preventing self-power supply device of electronic combined mutual inductor

A combined transformer and ferromagnetic resonance technology is applied in the field of electronic combined transformer anti-ferromagnetic resonance self-power supply devices, which can solve the problems of power supply voltage transformer explosion, high-voltage fuse blowing, endangering power grid safety, etc., and achieve the quality factor value. The effect of reducing, improving temperature characteristics, and enhancing the ability to suppress resonant current

Inactive Publication Date: 2013-09-04
陈劲游 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there is an additional electromagnetic voltage transformer for power supply without an external low-voltage power supply, the problem of preventing magnetic saturation of the electromagnetic voltage transformer is not adopted, and the electromagnetic voltage transformer for power supply is prone to ferromagnetic resonance with the power grid, resulting in high voltage. The fuse blows, and even causes the explosion of the power supply voltage transformer, endangering the safety of the power grid and other issues

Method used

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  • Ferroresonance-preventing self-power supply device of electronic combined mutual inductor
  • Ferroresonance-preventing self-power supply device of electronic combined mutual inductor
  • Ferroresonance-preventing self-power supply device of electronic combined mutual inductor

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Effect test

Embodiment 1

[0022] Embodiment 1: see image 3 , the damping resistor 2 adopts a linear resistor, and at least one end of the primary coil of the energy supply transformer 3 is connected in parallel with the two ends of the primary coil of the electronic voltage transformer 1; the secondary coil of the energy supply transformer 3 is connected to The isolation transformer 4A, the secondary output terminal of the isolation transformer 4A is connected to the rectification filter voltage stabilization circuit 4B, the output terminal of the rectification filter voltage stabilization circuit 4B is connected to the secondary voltage signal conversion circuit 5 and provides working power for it; The secondary voltage signal output terminal of the electronic voltage transformer 1 is connected to the input terminal of the secondary voltage signal conversion circuit 5, and the secondary voltage signal output by the electronic voltage transformer 1 is converted by the secondary voltage signal conversio...

Embodiment 2

[0023] Example 2: see Figure 4 , the damping resistor 2 adopts a positive temperature coefficient thermistor, and at least one end of the primary coil of the energy supply transformer 3 is connected in parallel with the positive temperature coefficient thermistor at the primary two ends of the electronic voltage transformer 1; the energy supply The secondary coil of the transformer 3 is connected to the isolation transformer 4A, the secondary output terminal of the isolation transformer 4A is connected to the rectification filter voltage stabilization circuit 4B, and the output terminal of the rectification filter voltage stabilization circuit 4B is connected to the secondary voltage signal conversion circuit 5 and is It provides working power; the secondary voltage signal output terminal of the electronic voltage transformer 1 is connected to the input terminal of the secondary voltage signal conversion circuit 5, and the secondary voltage signal output by the electronic volt...

Embodiment 3

[0024] Embodiment 3: see Figure 5 , the damping resistor 2 adopts a series resistance composed of a positive temperature coefficient thermistor and a linear resistance, and at least one end of the primary coil of the energy supply transformer 3 is connected in parallel with a series resistance composed of a positive temperature coefficient thermistor and a linear resistance. The primary two ends of the electronic voltage transformer 1; the secondary coil of the energy supply transformer 3 is connected to the isolation transformer 4A, and the secondary output terminal of the isolation transformer 4A is connected to the rectification, filtering and voltage stabilizing circuit 4B, and the rectification, filtering and voltage stabilization The output terminal of the circuit 4B is connected to the secondary voltage signal conversion circuit 5 and provides working power for it. The secondary voltage signal output terminal of the electronic voltage transformer 1 is connected to the i...

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PUM

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Abstract

The invention discloses a ferroresonance-preventing self-power supply device of an electronic combined mutual inductor. The ferroresonance-preventing self-power supply device comprises an electronic voltage mutual inductor, a damping resistor, an energy supply transformer, an isolating transformer, a rectifying, filtering and voltage-stabilizing circuit and an electronic current mutual inductor, wherein at least one end of a primary coil of the energy supply transformer is connected in parallel with both ends of a primary coil of the electronic voltage mutual inductor after being connected in series with the damping resistor; a secondary coil of the energy supply transformer is connected with the isolating transformer; the secondary output end of the isolating transformer is connected with the rectifying, filtering and voltage-stabilizing circuit; the secondary voltage signal output end of the electronic voltage mutual inductor is connected with the input end of a secondary voltage signal converting circuit; and one end of the primary coil of the electronic voltage mutual inductor is connected with a bus, the other end of the primary coil of the electronic voltage mutual inductor is grounded, and the primary coil of the electronic current mutual inductor is connected in series with the bus. The invention aims to provide the ferroresonance-preventing self-power supply device of the electronic combined mutual inductor, and the ferroresonance-preventing self-power supply device can not generate overlarge resonance current and can be used for preventing ferroresonance.

Description

[technical field] [0001] The invention relates to the technical field of power grid measurement and control, in particular to an electronic combined transformer anti-ferromagnetic resonance self-power supply device. [Background technique] [0002] The voltage transformer of the current electromagnetic combined transformer is prone to ferromagnetic resonance with the power grid, causing the high-voltage fuse to blow, and even causing the voltage transformer to explode, endangering the safety of the power grid. The electronic voltage transformer itself does not produce ferromagnetic resonance, but the signal output power is very small, and an external low-voltage power supply is required to provide working power for its secondary signal conversion circuit and secondary electronic instruments such as electric energy meters. Although there is an additional electromagnetic voltage transformer for power supply without an external low-voltage power supply, the problem of preventing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/34H01F27/34
Inventor 陈劲游
Owner 陈劲游