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Capacitance current-limiting electricity taking device and partial discharge capacity reducing method thereof

A technology of power-taking device and capacitor current-limiting, applied in the field of power supply, can solve the problems of partial discharge reduction, electromagnetic interference, modulation, etc., and achieve the effect of voltage stability

Active Publication Date: 2021-12-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a capacitive current-limiting power-taking device and a method for reducing its partial discharge capacity in view of the deficiencies in the above-mentioned prior art, which can solve the existing electromagnetic interference, local In spite of problems such as high discharge capacity and AC output voltage modulation, it still has cost and volume economy and applicability, so that the capacitive current-limiting power-taking device with bidirectional isolation can be quickly applied in engineering

Method used

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  • Capacitance current-limiting electricity taking device and partial discharge capacity reducing method thereof
  • Capacitance current-limiting electricity taking device and partial discharge capacity reducing method thereof
  • Capacitance current-limiting electricity taking device and partial discharge capacity reducing method thereof

Examples

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Effect test

Embodiment 1

[0052] see image 3 , is a 10kV capacitive current-limiting power-taking device with bidirectional isolation with short-circuit protection of the load-side interface, installed between the high-voltage terminal of the 10kV column switch and the ground, and used for power supply of the 10kV column switch FTU.

[0053] The high-voltage power-taking capacitor is a high-voltage capacitor of 3000pF;

[0054] The impact protection device is a gas discharge tube;

[0055] Each rated voltage of the transformer is AC 2500V / 220 / 27V;

[0056] The short-circuit switch can short-circuit the second winding of the transformer when the load is not connected, and automatically disconnect after the load is connected;

[0057] The measurement and control module includes 60V / 12V step-down DC / DC converter, AC voltage measurement chip, operational amplifier chip and signal output circuit;

[0058] The bleeder module includes a bleeder switch and a bleeder resistor;

[0059] This embodiment can ...

Embodiment 2

[0061] see Figure 4 , is a 10kV capacitive current-limiting power-taking device with bidirectional isolation with over-current short-circuit switch, installed between the 10kV line and the ground, and used for power supply of 10kV line monitoring equipment and communication devices.

[0062] The high-voltage power-taking capacitor is a high-voltage capacitor of 4000pF;

[0063] The impact protection device is a varistor;

[0064] Each rated voltage of the transformer is AC 2400V / 27 / 27V;

[0065] The over-current short-circuit switch can measure the effective value of the AC current of the third winding of the transformer, and close the short-circuit switch when the current exceeds the set value to short-circuit the third winding of the transformer;

[0066] The measurement and control module includes 40V / 5V step-down DC / DC converter, AC voltage measurement chip, operational amplifier chip and signal output circuit;

[0067] The bleeder module includes a bleeder switch and ...

Embodiment 3

[0070] see Figure 5 , is a 10kV capacitive current-limiting power-taking device with bidirectional isolation with capacitive bypass, installed between the 10kV line and the ground, and used for the power supply of the 10kV line intelligent arrester monitor.

[0071] The high-voltage power-taking capacitor is a high-voltage capacitor of 4000pF;

[0072] The impact protection device is a varistor;

[0073]Each rated voltage of the transformer is AC 2400V / 27 / 27V;

[0074] The capacitor bypass branch can be based on the control signal of the measurement and control module. When the discharge power of the discharge module reaches 10W, the capacitor bypass switch is closed, and the bypass capacitor is put in, so that the current part of the third winding of the transformer is shunted to the bypass capacitor branch to reduce The bleeder module bleeds the power, thereby reducing the heat generation of the device;

[0075] The measurement and control module includes 40V / 5V step-dow...

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Abstract

The invention discloses a capacitor current-limiting electricity taking device and a partial discharge capacity reducing method thereof, a first winding of a transformer and a high-voltage capacitor are connected in series between a high-voltage line and the ground, and the first winding of the transformer is connected in parallel with an impact protection device; a second winding of the transformer is connected with an alternating-current load, a third winding of the transformer is connected with a power taking device control circuit, the power taking device control circuit is used for maintaining voltage stability of a power taking device and achieving overvoltage protection, and the second winding and the third winding of the transformer are connected through a magnetic field. The device has the functions of short-circuit protection, open-circuit protection, power-frequency overvoltage protection, impulse voltage protection and partial discharge capacity limitation, can reliably protect the transformer, the control circuit and other parts of the power taking device, can meet various performance detection tests, and can be prevented from being damaged.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a capacitive current-limiting power-taking device and a method for reducing partial discharge. Background technique [0002] At present, the existing capacitive current-limiting power-taking devices in the power grid are emerging electrical equipment, and there are many significant problems, such as excessive partial discharge, output voltage is easily disturbed by power grid voltage, low power or efficiency, and difficult AC output modulation. Poor ability to withstand power frequency overvoltage, control circuit is susceptible to electromagnetic interference caused by impact overvoltage, etc., resulting in poor overall tolerance, short service life and poor power supply quality of the capacitive current-limiting power-taking device, so there is an urgent need for a An effective capacitive current-limiting power-taking device protection and control scheme solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/14G01R1/36H02H7/055H02H9/04
CPCG01R31/1227G01R31/14G01R1/36H02H7/055H02H9/04
Inventor 杨兰均史宇昊刘成英肖昕岩
Owner XI AN JIAOTONG UNIV
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