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Self-powered 3PT (Potential Transformer) three-phase three-line high-voltage electric energy measurement cabinet or measurement box capable of preventing ferromagnetic resonance for electronic type mutual inductor

An electronic transformer, three-phase three-wire technology, applied in the direction of voltage/current isolation, etc., can solve the problems of reliability impact of electric energy measurement, explosion of power supply voltage transformer, explosion of voltage transformer, etc., to improve anti-theft performance, The effect of reducing the quality factor value and improving the temperature characteristics

Inactive Publication Date: 2014-03-12
佛山市华电互感开关有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the current 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, endangering Grid security, therefore, 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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  • Self-powered 3PT (Potential Transformer) three-phase three-line high-voltage electric energy measurement cabinet or measurement box capable of preventing ferromagnetic resonance for electronic type mutual inductor
  • Self-powered 3PT (Potential Transformer) three-phase three-line high-voltage electric energy measurement cabinet or measurement box capable of preventing ferromagnetic resonance for electronic type mutual inductor
  • Self-powered 3PT (Potential Transformer) three-phase three-line high-voltage electric energy measurement cabinet or measurement box capable of preventing ferromagnetic resonance for 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 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 self-powered 3PT (Potential Transformer) three-phase three-line high-voltage electric energy measurement cabinet or measurement box capable of preventing ferromagnetic resonance for an electronic type mutual inductor. The electric energy measurement cabinet or measurement box is characterized by comprising three sets of electronic type potential transducer self-powered devices, two electronic type current transducers and one electronic type electric energy meter, wherein each electronic type potential transducer self-powered device comprises an electronic type potential transducer, a damping resistor, a power supply transformer, an isolation transformer and a rectifying and filtering voltage-stabilizing circuit; at least one end of a primary coil of each power supply transformer is connected with each damping resistor in series and then is connected with two ends of the primary coil of each electronic type potential transducer in parallel; a secondary coil of each electronic type transformer is connected with each isolation transformer; one ends of the primary coils of the electronic type potential transducers of the three sets of the electronic type potential transducer self-powered devices are respectively connected with three phases of buses A, B and C; and the primary coils of two electronic type current transducers are respectively connected with two phases of the buses A and B in series. The invention aims to provide the 3PT three-phase three-line high-voltage electric energy measurement cabinet or measurement box capable of preventing 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 3PT three-phase three-wire electronic transformer with anti-ferromagnetic resonance self-power supply. [Background technique] [0002] Most of the current 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, endangering Grid security, therefore, 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/18
Inventor 陈劲游
Owner 佛山市华电互感开关有限公司