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

A voltage transformer, ferromagnetic resonance technology, applied in inductors, transformers, preventing/reducing unwanted electrical/magnetic effects, etc., can solve problems such as power supply voltage transformer explosion, high-voltage fuse blowing, and endangering power grid security. , to achieve the effect of reducing the quality factor value, improving the temperature characteristics, and enhancing the ability to suppress the resonant current

Inactive Publication Date: 2013-09-04
北流市柯顺电子有限公司
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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 voltage mutual inductor
  • Ferroresonance preventing self-power supply device of electronic voltage mutual inductor
  • Ferroresonance preventing self-power supply device of electronic voltage mutual inductor

Examples

Experimental program
Comparison scheme
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, and the output terminal of the rectification filter voltage stabilization circuit 4B is connected to the secondary voltage signal conversion circuit 5; the electronic voltage transformer 1 The output terminal of the secondary voltage signal 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 conversion circuit 5 to output the ...

Embodiment 2

[0023] Example 2: see Figure 4 , the damping resistor 2 adopts a positive temperature coefficient thermistor. The primary coil of the energy supply transformer 3 has at least one end connected in series with a positive temperature coefficient thermistor and connected in parallel to 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, 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; the secondary voltage signal output of the electronic voltage transformer 1 The terminal is connected with the input terminal of the secondary voltage signal conversion circuit 5, and the secondary voltage signal output by the electronic voltage transforme...

Embodiment 3

[0024] Embodiment 3: see Figure 5 , the damping resistor 2 is a series resistor composed of a positive temperature coefficient thermistor and a linear resistor. The primary coil of the energy supply transformer 3 has at least one end connected in series with a series resistor composed of a positive temperature coefficient thermistor and a linear resistor and then connected in parallel at both ends of the primary coil of the electronic voltage transformer 1; the secondary coil of the energy supply transformer 3 Connect 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; the electronic voltage transformer The secondary voltage signal output terminal of 1 is connected to the input terminal of the secondary voltage signal...

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Abstract

The invention discloses a ferroresonance preventing self-power supply device of an electronic voltage mutual inductor, which comprises an electronic voltage mutual inductor, a damping resistor, an energy supply transformer, an isolating transformer and a rectifying and filtering and voltage-stabilizing circuit, 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 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 and filtering and voltage-stabilizing circuit; the output end of the rectifying and filtering and voltage-stabilizing circuit is connected with a secondary voltage signal converting circuit; the secondary voltage signal output end of the electronic voltage mutual inductor is connected with the input end of the secondary voltage signal converting circuit; and a secondary voltage signal output by the electronic voltage mutual inductor outputs a converted secondary voltage signal after converted by the secondary voltage signal converting circuit. The invention provides the ferroresonance preventing self-power supply device of the electronic mutual inductor, which can not generate an overlarge resonance current and achieves the aim of ferroresonance prevention.

Description

[technical field] [0001] The invention relates to the technical field of power grid measurement and control, in particular to an electronic voltage transformer anti-ferromagnetic resonance self-power supply device. [Background technique] [0002] The current electromagnetic voltage 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 magnetic saturation of the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/24H01F27/34H02M7/02
Inventor 陈劲游
Owner 北流市柯顺电子有限公司