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Measurement method of operating current of DC transfer switch arrester in HV/UHV converter station

A technology of DC conversion and action current, applied in the field of electronics, to shorten the maintenance time, ensure safe and efficient operation, and avoid breakdown

Active Publication Date: 2019-05-14
苏州银蕨电力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a method for measuring the operating current of the DC transfer switch arrester in the HV / UHV converter station. The problem of operating current measurement under overvoltage, so that the current of each action of the DC conversion switch arrester can be obtained, and then the characteristics and changing trends of each arrester can be analyzed

Method used

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  • Measurement method of operating current of DC transfer switch arrester in HV/UHV converter station
  • Measurement method of operating current of DC transfer switch arrester in HV/UHV converter station
  • Measurement method of operating current of DC transfer switch arrester in HV/UHV converter station

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Effect test

Embodiment 1

[0041] [Example 1] Measuring device for operating current of DC transfer switch arrester in HV / UHV converter station

[0042] The traditional method of measuring the arrester current can only fully and accurately grasp the changes in the characteristics of the arrester by analyzing the action waveform of each parallel arrester. In this embodiment of the present invention, a high-precision synchronous sampling scheme is adopted. Such as figure 1As shown, the measuring device for the operating current of the DC switch arrester in the HV / UHV converter station of the present invention includes a precision current sensor 101 , a high-precision analog-to-digital converter 102 , an automatic frequency calibration unit 103 and a positioning and navigation unit 104 . Among them, the precision current sensor 101 is used to sample the current of the arrester or the current of each branch of the connection line at the top of the arrester, and the high-precision analog-to-digital converte...

Embodiment 2

[0047] [Example 2] Measurement system for operating current of DC transfer switch arrester in HV / UHV converter station

[0048] Such as image 3 and Figure 4 As shown, it is the application of the measuring device of the present invention. The measuring system for the operating current of the DC transfer switch arrester in the HV / UHV converter station includes several arresters 2 and several measuring devices 1. The arresters 2 are connected in parallel, and each arrester At least one measuring device 1 is provided corresponding to the current input end of 2 . Preferably, each measuring device 1 includes a positioning navigation unit 104, a high-precision analog-to-digital converter 102, and a precision current sensor 101 and an automatic frequency calibration unit 103 respectively connected to the high-precision analog-to-digital converter 102, wherein , the positioning and navigation unit 104 transmits pulse signals to the high-precision analog-to-digital converter 102 an...

Embodiment 3

[0049] [Example 3] Measurement method of operating current of DC transfer switch arrester in HV / UHV converter station

[0050] Such as figure 2 As shown, a method for measuring the operating current of a DC transfer switch arrester in a HV / UHV converter station includes the following steps:

[0051] Several precision current sensors 101 receive current signals at corresponding collection points.

[0052] The corresponding high-precision analog-to-digital converter 102 samples the current signal received by the current sensor 101 .

[0053] Calibrate the sampling signal of the high-precision analog-to-digital converter 102: when the pulse signal of the positioning navigation unit 104 is transmitted to the error calculation unit 204, the error calculation unit 204 reads the count value of the high-frequency counter 202, and the count value is consistent with the crystal oscillator 201: Subtract the ideal value to obtain the current frequency offset, and accumulate the current...

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Abstract

The invention relates to a high voltageextra-high voltage converter station DC change-over switch lightning arrester action current measuring device, method and application. The measuring device comprises a precise current sensor, a high precision analog-to-digital converter, an automatic frequency calibration unit and a positioning navigation unit. The measuring device employs the measuring method of the invention to measure current, and realizes action current high precision sampling of a single lightning arrester among parallel lightning arresters; in addition, based on the positioning navigation unit, the measuring device realizes automatic frequency calibration, and guarantees current measurement synchronization of all lightning arresters.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a method for measuring the operating current of a lightning arrester of a DC transfer switch in a high-voltage / ultra-high voltage converter station. Background technique [0002] The DC transfer switch is the key equipment of the DC field of the HV / UHV DC project. It is mainly used for the conversion of various operating modes of the DC transmission system, the conversion of the grounding system, and troubleshooting. Since the breaking of DC current does not take advantage of the zero-crossing point of AC current like that of AC current, the breaking of DC current must force zero-crossing. However, when the DC current is forced to cross zero, the DC system stores huge energy and needs to be released, and the released energy will generate overvoltage on the circuit, causing the arc between the breaker breaks to re-ignite, resulting in breaking failure . [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R31/00
CPCG01R19/0092G01R31/00
Inventor 张民叶远张斌方明
Owner 苏州银蕨电力科技有限公司
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