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AC power system voltage sensor

A voltage sensor, power system technology, applied in the direction of measuring current/voltage, voltage divider, instruments, etc., can solve the problems of unstable voltage divider ratio, large electromagnetic interference, heavy weight, etc., to achieve good linearity and accuracy, good Safety features, effect of simple structure

Inactive Publication Date: 2008-05-28
CHONGQING UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

But they also have obvious defects: due to ferromagnetic saturation, the measurement result of the transformer is non-linear with the input value, the transient response is poor, and it cannot be measured for the overvoltage signal in the power system; and it is large in size and heavy in weight.
This kind of sensor essentially performs capacitive voltage division through the distributed capacitance formed by the induced electric field between the voltage and the electrodes. Since the electromagnetic interference in the substation of the high-voltage power grid is very large, the distributed capacitance of various equipment in the substation affects each other. Therefore, The size of the voltage-dividing capacitor is easily changed by external influences, which causes the voltage-dividing ratio to be unstable, which will inevitably cause measurement errors, which affects the application of the sensor to 110kV and higher voltage grids

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032]As shown in Figures 1 to 3: a 110kV AC power system voltage sensor, including a 110kV transformer capacitor bushing 1, a current coil 2, an electronic conversion unit 3, a grounding wire 4 at the end of the bushing, a coaxial cable 5, and a grounding wire 4 One end is connected to the end screen of the transformer capacitor bushing 1, and the other end is grounded through the current coil 2. The current coil 2 and the electronic conversion unit 3 are connected through a coaxial cable 5, and the output of the electronic conversion unit 3 is output to the second coil through the coaxial cable. Three-party acquisition device. The current coil 2 is composed of a nanocrystalline alloy annular iron core, a winding, a double-layer shielding structure, a shielding shell and a coaxial cable connector. In the shielding shell, the windings are respectively set from the inside to the outside. The number of turns wound by enameled wire with a diameter of 0.19mm It is a 200-turn windi...

Embodiment 2

[0034] As shown in Figures 1 to 3: a 110kV AC power system voltage sensor, including 110kV capacitive current transformer 1, current coil 2, electronic conversion unit 3, bushing end screen grounding wire 4, coaxial cable 5, grounding wire 4. One end is connected to the end screen of the capacitive current transformer 1, and the other end is grounded through the current coil 2. The current coil 2 and the electronic conversion unit 3 are connected through a coaxial cable 5, and the output of the electronic conversion unit 3 is output through a coaxial cable. to a third-party collection device. The current coil 2 is composed of a nanocrystalline alloy annular iron core, a winding, a double-layer shielding structure, a shielding shell and a coaxial cable connector. In the shielding shell, the windings are respectively set from the inside to the outside. The number of turns wound by enameled wire with a diameter of 0.15mm It is a winding of 500 turns, a nanocrystalline alloy annul...

Embodiment 3

[0036]As shown in Figures 1 to 3: a 110kV AC power system voltage sensor, including 110kV capacitive voltage transformer 1, current coil 2, electronic conversion unit 3, bushing end screen grounding wire 4, coaxial cable 5, grounding wire 4. The end screen of the potential transformer 1 at one end and the other end pass through the current coil 2 to ground, and the current coil 2 and the electronic conversion unit 3 are connected through a coaxial cable 5, and the output of the electronic conversion unit 3 is output to a third party through a coaxial cable collection device. The current coil 2 is composed of a nanocrystalline alloy annular iron core, a winding, a double-layer shielding structure, a shielding shell and a coaxial cable connector. In the shielding shell, the windings are respectively set from the inside to the outside. The number of turns wound by enameled wire with a diameter of 0.15mm It is a 600-turn winding, a nanocrystalline alloy annular iron core and a dou...

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Abstract

The invention discloses a voltage sensor of an ac power system, which relates to a voltage signal catching device of the ac power system. The voltage sensor of the invention is composed of substation capacitive equipment, a current coil, an electronic transforming unit, an earth lead, and a coaxial cable. The voltage sensor of the invention can work under power frequency exchanging circumstance for a long time and can bear big attacking electric voltage, outputting signals of the voltage sensor are separated thoroughly with an electrified wire netting though only once separation. The invention has the advantages of small volume, light weight, convenient installment. The preciseness of testing power frequency voltage signals can be reached to 1 grade, uncertainty of voltages peak values which are tested and operated is less then +-1%, the uncertainty of time parameters is in a range of +-3%, and thereby the invention can apply for collecting the electric signal of an electric system 10kV to 500kV.

Description

technical field [0001] The invention belongs to the field of power system voltage testing, and relates to an acquisition device for AC power system voltage signals. Background technique [0002] At present, the traditional AC power system voltage sensors are all electromagnetic voltage sensors with iron core coil structure. These voltage sensors use the principle of electromagnetic induction, and the primary and secondary measuring circuits are electrically isolated, so that the secondary equipment and personal Security is guaranteed. But they also have obvious defects: due to ferromagnetic saturation, the measurement result of the transformer is non-linear with the input value, the transient response is poor, and it is impossible to measure the overvoltage signal in the power system; and it is large in size and heavy in weight. [0003] A high-voltage divider is also a commonly used device for obtaining voltage signals. There are mainly several structural forms such as a r...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/06
Inventor 杜林陈伟根司马文霞唐炬王有元张晓星姚陈果刘伟明
Owner CHONGQING UNIV
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