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Ferromagnetic resonance resistant and self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box

An electronic transformer, ferromagnetic resonance technology, applied in the direction of inductors, voltage/current isolation, substation/switchgear board/panel/desk, etc. The problem of low signal output power, etc., can reduce the quality factor value, improve the anti-theft performance, and improve the temperature characteristics.

Inactive Publication Date: 2014-12-03
广州汇数信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the current 2PT three-phase three-wire high-voltage electric energy metering cabinets and metering boxes use electromagnetic voltage transformers to obtain voltage signals. Electromagnetic voltage transformers are prone to ferromagnetic resonance with the power grid, causing high-voltage fuses to blow, and even causing voltage transformers to explode. It endangers the safety of the power grid. Therefore, it has become a major technical problem for high-voltage electric energy metering cabinets and metering boxes
Although the electronic voltage transformer is not easy to produce ferromagnetic resonance with the power grid, the signal output power is very small. Now, an external low-voltage power supply is generally used to provide working power for its secondary signal conversion circuit and secondary electronic instruments such as electric energy meters.
However, if the high-voltage electric energy metering cabinet and metering box use an external low-voltage power supply to provide working power for the electric energy meter, the reliability of electric energy metering will be affected by the external power supply, which is not conducive to preventing electricity theft.
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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  • Ferromagnetic resonance resistant and self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box
  • Ferromagnetic resonance resistant and self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box
  • Ferromagnetic resonance resistant and self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 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

[0027] 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

[0028] 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 ferromagnetic resonance resistant and self-powered 2PT three-phase three-wire electronic transformer high-voltage electric energy metering cabinet or metering box, which comprises two sets of electronic combination transformer ferromagnetic resonance resistant and self-powered devices and an electronic electric energy meter. The electronic combination transformer ferromagnetic resonance resistant and self-powered device comprises an electronic voltage transformer, a damping resistance, an energy supply transformer, an isolation transformer, a rectifying, filtering and voltage-stabilizing circuit and an electronic current transformer. The primary coil of the energy supply transformer, at least one end of which is connected with the damping resistance in series, is connected to the two ends of the primary of the electronic voltage transformer in parallel. The primary coils of the electronic voltage transformers of the two sets of electronic combination transformer ferromagnetic resonance resistant and self-powered devices are respectively connected to a bus. The invention provides the 2PT three-phase three-wire high-voltage electric energy metering cabinet or metering box, which cannot generate excessive resonance current and can achieve the purpose of resisting the ferromagnetic resonance.

Description

[technical field] [0001] The invention relates to the technical field of electric energy metering for distribution network measurement and control, in particular to a high-voltage electric energy metering cabinet or metering box for a 2PT three-phase three-wire electronic transformer with anti-ferromagnetic resonance self-power supply. [Background technique] [0002] Most of the existing 2PT three-phase three-wire high-voltage electric energy metering cabinets and metering boxes use electromagnetic voltage transformers to obtain voltage signals. Electromagnetic voltage transformers are prone to ferromagnetic resonance with the power grid, causing high-voltage fuses to blow, and even causing voltage transformers to explode. It endangers the safety of the power grid. Therefore, it has become a major technical problem for high-voltage electric energy metering cabinets and metering boxes. Although the electronic voltage transformer is not easy to produce ferromagnetic resonance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/18H02B1/04H02B1/24H01F38/38
Inventor 陈劲游
Owner 广州汇数信息科技有限公司