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Anti-ferromagnetic-resonance self-powered three-phase four-wire high-voltage electric energy metering cabinet or metering box of electronic type mutual inductor

An electronic transformer, ferromagnetic resonance technology, applied in the direction of inductors, preventing/reducing unwanted electrical/magnetic influences, boards/panels/desks of substations/switching devices, etc., can solve the reliability impact of electric energy measurement , power supply voltage transformer explosion, voltage transformer explosion and other problems, to achieve the effect of improving the anti-theft performance, reducing the quality factor value, and improving the temperature characteristics

Active Publication Date: 2014-12-10
LU SHANDONG ELECTRIC POWER GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the current three-phase four-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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  • Anti-ferromagnetic-resonance self-powered three-phase four-wire high-voltage electric energy metering cabinet or metering box of electronic type mutual inductor
  • Anti-ferromagnetic-resonance self-powered three-phase four-wire high-voltage electric energy metering cabinet or metering box of electronic type mutual inductor
  • Anti-ferromagnetic-resonance self-powered three-phase four-wire high-voltage electric energy metering cabinet or metering box of electronic type mutual inductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 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

[0024] 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

[0025] Embodiment 3: see Figure 5 , the damping resistor 2 adopts 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 si...

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Abstract

The invention discloses an anti-ferromagnetic-resonance self-powered three-phase four-wire high-voltage electric energy metering cabinet or metering box of an electronic type mutual inductor, which comprises three sets of anti-ferromagnetic-resonance self-power devices of the electronic type combined mutual inductor and an electronic type electric energy meter. Each anti-ferromagnetic-resonance self-power device of the electronic type combined mutual inductor comprises an electronic type voltage mutual inductor, a damping resistor, a power supply transformer, an isolation transformer, a rectification filter voltage-stabilizing circuit and an electronic type current mutual inductor; at least one end of a primary coil of the power supply transformer is serially connected with the damping resistor and then is connected with two ends of a primary coil of the electronic type voltage mutual inductor in parallel; one end of the primary coils of all the electronic type voltage mutual inductors of the three sets of the anti-ferromagnetic-resonance self-power devices of the electronic type combined mutual inductor is respectively connected with buses of a phase A, a phase B and a phase C; and one end of the primary coils of all the electronic type current mutual inductors of the three sets of the anti-ferromagnetic-resonance self-power devices of the electronic type combined mutual inductor are respectively and serially connected with buses of the phase A, the phase B and the phase C. In the invention, the over-high resonance current is not generated so that the ferromagnetic resonance can be prevented.

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 three-phase four-wire electronic transformer high-voltage electric energy metering cabinet or metering box for anti-ferromagnetic resonance self-power supply. [Background technique] [0002] Most of the current three-phase four-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 gri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/34H01F38/38H02B1/04H02B1/24
Inventor 陈劲游
Owner LU SHANDONG ELECTRIC POWER GRP CO LTD