CN202870258U - Online electric abrasion detecting system of vacuum circuit breaker - Google Patents

Online electric abrasion detecting system of vacuum circuit breaker Download PDF

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Publication number
CN202870258U
CN202870258U CN 201220519160 CN201220519160U CN202870258U CN 202870258 U CN202870258 U CN 202870258U CN 201220519160 CN201220519160 CN 201220519160 CN 201220519160 U CN201220519160 U CN 201220519160U CN 202870258 U CN202870258 U CN 202870258U
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China
Prior art keywords
unit
circuit breaker
vacuum circuit
arc
central processing
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Expired - Fee Related
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CN 201220519160
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Chinese (zh)
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张鑫
范兴明
刘华东
李震
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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  • Arc-Extinguishing Devices That Are Switches (AREA)
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Abstract

The utility model discloses an online electric abrasion detecting system of a vacuum circuit breaker. The online electric abrasion detecting system comprises three current transformers, a current signal conditioning unit, a digital-to-analog conversion unit, three electric arc property probers, an electric arc signal conditioning unit, an arcing time pre-treatment unit, an on-off frequency counting pre-treatment unit, a central processing unit, a local alarming unit and a power supply unit. The online electric abrasion detecting system of the vacuum circuit breaker can provide a relatively accurate electric abrasion evaluation method and an accomplishing means, and is the premise for realizing electric abrasion online detection and state maintenance.

Description

Vacuum circuit breaker electrical wear on-line detecting system
Technical field
The utility model relates to power switchgear on-line monitoring field, is specifically related to a kind of vacuum circuit breaker electrical wear on-line detecting system.
Background technology
Along with planning and the application development of intelligent grid technology, intelligent distribution network smart machine and correlation technique demand constantly increase.Isolating switch is the security guard of the normal stable operation of assurance system in electric system, and it plays the double action of control and protection in system.Along with the development of technology and application demand, the Study of intelligent of power high voltage switch and application technology system operations staff and the higher attention of researcher have been obtained.The development and application of intelligent switch becomes present study hotspot, in the past for the detection of contacts for vacuum-break switches system electrical wear and fault diagnosis mainly based on the dropout current weighted cumulative and improve algorithm, the method is generally based on the electric life curve of isolating switch, the thought that adopts the dropout current equivalence to convert is assessed the wear extent of single operation and is added up, then the wearing and tearing total amount with theory compares the residue wear extent that draws breaker contact system, and provides maintenance and change suggestion according to setting the early warning limit value.Yet the electrical wear of above-mentioned establishment is online to be detected with monitoring accuracy and the accuracy of diagnostic system not highly, therefore seeks a kind of comparatively accurate electrical wear appraisal procedure and realization means and is and realize the online prerequisite that detects with State Maintenance of electrical wear.
The utility model content
Technical problem to be solved in the utility model provides a kind of vacuum circuit breaker electrical wear on-line detecting system, and it can provide a kind of comparatively accurate electrical wear appraisal procedure and realization means, for realizing the prerequisite of the online detection of electrical wear and State Maintenance.
For addressing the above problem, the utility model is achieved through the following technical solutions:
A kind of vacuum circuit breaker electrical wear of the utility model on-line detecting system mainly is comprised of current transformer, current signal conditioning unit, AD conversion unit, arc characteristic detector, arc signal conditioning unit, arc time pretreatment unit, open and close times statistics pretreatment unit, CPU (central processing unit), local alarm unit and power supply unit.Wherein current transformer adopts the punching mode to be sleeved on 3 buses of isolating switch.The output terminal of current transformer links to each other with the input end of CPU (central processing unit) with AD conversion unit via the current signal conditioning unit successively.3 arc characteristic detectors are installed in respectively near the 3 phase arc-chutes of vacuum circuit breaker to be measured.The output terminal of arc characteristic detector is divided into two-way after via the arc signal conditioning unit, the arc time pretreatment unit of leading up to is connected to the input end of CPU (central processing unit), and another road is connected to the input end of CPU (central processing unit) by open and close times statistics pretreatment unit.Local alarm unit and power supply unit all are connected on the CPU (central processing unit).
The current value i of the vacuum circuit breaker to be measured that current transformer detects BiAfter the analog to digital conversion of the conditioning of overcurrent signal conditioning unit and AD conversion unit, send in the CPU (central processing unit) successively.After the conditioning of the arc characteristic of the vacuum circuit breaker to be measured that the arc characteristic detector detects through the arc signal conditioning unit, send into the arc time t that the arc time pretreatment unit obtains vacuum circuit breaker to be measured Ai, finish an arcing to arc extinguishing week after date when vacuum circuit breaker to be measured, send into the statistics that open and close times statistics pretreatment unit carries out the open and close times of vacuum circuit breaker to be measured.CPU (central processing unit) according to claim 1～3 described vacuum circuit breaker electrical wear online test method to the current value i of vacuum circuit breaker to be measured Bi, arc time t AiProcess with the total degree n that cut-offs, obtain the residual electricity wear extent of contacts for vacuum-break switches system.When this residual electricity wear extent surpass to be set the early warning limit value, send the local alarm unit of signal driver and send maintenance and change and report to the police.
In the said system, preferably also be provided with communications interface unit on the CPU (central processing unit), CPU (central processing unit) links to each other with host computer by this communications interface unit.
In the said system, described arc characteristic detector mainly is made of insulation shell and the electro-magnetic screen layer, magnetic core and the metal inductive coil that are arranged in the insulation shell.Electro-magnetic screen layer is affixed on the inboard of insulation shell sidewall and rear end face, the magnetic core of cylindricality is positioned at the center of insulation shell, the metal inductive coil is looped around the periphery of magnetic core spirally, and outer two output terminals as the arc characteristic detector of insulation shell are stretched out respectively at the two ends of metal inductive coil.
Compared with prior art, the vacuum circuit breaker electrical wear on-line detecting system that the utility model is constructed can overcome the dropout current index and single wear extent accumulative total be caused the impact of larger result error and improve the accuracy of electric life assessment and the reliability of maintenance suggestion; In addition, the communication interface of setting up is single to have preferably interchangeability and interoperability so that system has good opening, convenient upgrading and maintenance.
Description of drawings
Fig. 1 is a kind of theory diagram of vacuum circuit breaker electrical wear on-line detecting system.
Embodiment
Below in conjunction with instantiation, the utility model is elaborated:
Vacuum circuit breaker electrical wear on-line detecting system as shown in Figure 1.This vacuum circuit breaker electrical wear on-line detecting system mainly is comprised of current transformer, current signal conditioning unit, AD conversion unit, arc characteristic detector, arc signal conditioning unit, arc time pretreatment unit, open and close times statistics pretreatment unit, CPU (central processing unit), local alarm unit and power supply unit.Wherein current transformer adopts the punching mode to be sleeved on 3 buses of isolating switch.The output terminal of current transformer links to each other with the input end of CPU (central processing unit) with AD conversion unit via the current signal conditioning unit successively.3 arc characteristic detectors are installed in respectively near the 3 phase arc-chutes of vacuum circuit breaker to be measured.The output terminal of arc characteristic detector is divided into two-way after via the arc signal conditioning unit, the arc time pretreatment unit of leading up to is connected to the input end of CPU (central processing unit), and another road is connected to the input end of CPU (central processing unit) by open and close times statistics pretreatment unit.Local alarm unit and power supply unit all are connected on the CPU (central processing unit).In addition, in order to carry out master control to native system, also be provided with communications interface unit on the described CPU (central processing unit), CPU (central processing unit) links to each other with host computer by this communications interface unit.
The structure of described current transformer and arc characteristic detector is same as the prior art or close, in the utility model preferred embodiment, described arc characteristic detector adopts electromagnetic induction principle, mainly is made of insulation shell and the electro-magnetic screen layer, magnetic core and the metal inductive coil that are arranged in the insulation shell.The magnetic core of cylindricality is positioned at the center of insulation shell, is used for improving the sensitivity that the isolating switch arc time inductor changes and picks up electromagnetic field.The metal inductive coil is looped around the periphery of magnetic core spirally, is the major function building block of the initial arcing moment of isolating switch arc time inductor detected arc and arc time, is used for receiving and identifying the external electromagnetic field variation characteristic that breaking arc causes.Outer two output terminals as the arc characteristic detector of insulation shell are stretched out respectively at the two ends of metal inductive coil.In order to reduce the phase mutual interference between signal, the output terminal of the utility model isolating switch arc time inductor adopts coaxial fitting as its output interface form, namely be provided with a coaxial fitting in the outside of insulation shell rear end face, one of them of two output terminals is connected with the heart yearn of coaxial fitting, as the output line end; Another output terminal is connected with the betal can of coaxial fitting, as signal with reference to earth terminal.Electro-magnetic screen layer is affixed on the inboard of insulation shell sidewall and rear end face, and its effect is to make the isolating switch arc time inductor have directivity and selectivity to the detection of electromagnetic field signal amount, prevent three-phase breaker each between mutually the phase mutual interference and affect measurement result.In order better each phase electromagnetic field signal of isolating switch to be selected and to be obtained, magnetic core and metal inductive coil preferably vertically are arranged in the insulation shell.In the utility model is preferably implemented, described insulation shell is cylindricality, the front end face of its housing and rear end face are two planes that are parallel to each other, and the axis of magnetic core and metal inductive coil is positioned at the place, axis of insulation shell, and perpendicular with the front end face of insulation shell.In addition, also be cast with epoxy resin in the internal cavities of insulation shell, to realize better electric insulation effect.
The current value i of the vacuum circuit breaker to be measured that current transformer detects BiAfter the analog to digital conversion of the conditioning of overcurrent signal conditioning unit and AD conversion unit, send in the CPU (central processing unit) successively.After the conditioning of the arc characteristic of the vacuum circuit breaker to be measured that the arc characteristic detector detects through the arc signal conditioning unit, send into the arc time t that the arc time pretreatment unit obtains vacuum circuit breaker to be measured Ai, finish an arcing to arc extinguishing week after date when vacuum circuit breaker to be measured, send into the statistics that open and close times statistics pretreatment unit carries out the open and close times of vacuum circuit breaker to be measured.CPU (central processing unit) is to the current value i of vacuum circuit breaker to be measured Bi, arc time t AiProcess with the total degree n that cut-offs, obtain the residual electricity wear extent of contacts for vacuum-break switches system.When this residual electricity wear extent surpass to be set the early warning limit value, send the local alarm unit of signal driver and send maintenance and change and report to the police.Power supply unit is realized system power supply.Communications interface unit realization native system is connected with host computer.

Claims (3)

1.真空断路器电磨损在线检测系统，其特征是，主要由3个电流互感器、电流信号调理单元、模数转换单元、3个电弧特性探测器、电弧信号调理单元、燃弧时间预处理单元、开断次数统计预处理单元、中央处理单元、本地报警单元和供电单元组成；其中3个电流互感器采用穿心方式套装在真空断路器的3相母线上；3个电流互感器的输出端同时经由电流信号调理单元和模数转换单元与中央处理单元的输入端相连；3个电弧特性探测器分别安装在待测真空断路器的3相灭弧室附近；电弧特性探测器的输出端经由电弧信号调理单元后分为两路，一路通过燃弧时间预处理单元连接至中央处理单元的输入端，另一路通过开断次数统计预处理单元连接至中央处理单元的输入端；本地报警单元和供电单元均连接在中央处理单元上。1. Vacuum circuit breaker electric wear on-line detection system, which is characterized in that it mainly consists of 3 current transformers, current signal conditioning unit, analog-to-digital conversion unit, 3 arc characteristic detectors, arc signal conditioning unit, and arcing time pretreatment unit, the number of breaking times statistical preprocessing unit, central processing unit, local alarm unit and power supply unit; among them, 3 current transformers are set on the 3-phase busbar of the vacuum circuit breaker in the way of passing through; the output of the 3 current transformers The terminal is connected to the input terminal of the central processing unit through the current signal conditioning unit and the analog-to-digital conversion unit at the same time; the three arc characteristic detectors are respectively installed near the three-phase arc extinguishing chamber of the vacuum circuit breaker to be tested; the output end of the arc characteristic detector After passing through the arc signal conditioning unit, it is divided into two routes, one route is connected to the input terminal of the central processing unit through the arc burning time preprocessing unit, and the other route is connected to the input terminal of the central processing unit through the breaking number statistics preprocessing unit; the local alarm unit and the power supply unit are connected to the central processing unit. 2.根据权利要求1所述的真空断路器电磨损在线检测系统，其特征是，中央处理单元上还设有通信接口单元，中央处理单元通过该通信接口单元与上位机相连。2. The online detection system for vacuum circuit breaker electrical wear according to claim 1, characterized in that the central processing unit is further provided with a communication interface unit, and the central processing unit is connected to the host computer through the communication interface unit. 3.根据权利要求1所述的真空断路器电磨损在线检测系统，其特征是，所述电弧特性探测器主要由绝缘壳体以及设置在绝缘壳体内的电磁屏蔽层、磁芯和金属感应线圈构成；电磁屏蔽层贴于绝缘壳体侧壁及后端面的内侧，柱形的磁芯位于绝缘壳体的中心，金属感应线圈螺旋地环绕在磁芯的外围，金属感应线圈的两端分别伸出绝缘壳体外作为电弧特性探测器的两个输出端。3. The online detection system for vacuum circuit breaker electrical wear according to claim 1, characterized in that the arc characteristic detector is mainly composed of an insulating casing and an electromagnetic shielding layer, a magnetic core and a metal induction coil arranged in the insulating casing Composition; the electromagnetic shielding layer is pasted on the inner side of the side wall and the rear end of the insulating shell, the cylindrical magnetic core is located in the center of the insulating shell, the metal induction coil is spirally wound around the periphery of the magnetic core, and the two ends of the metal induction coil are extended respectively. Out of the insulating shell as the two output terminals of the arc characteristic detector.
CN 201220519160 2012-10-11 2012-10-11 Online electric abrasion detecting system of vacuum circuit breaker Expired - Fee Related CN202870258U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102879735A (en) * 2012-10-11 2013-01-16 桂林电子科技大学 Online electric abrasion detecting method and system of vacuum circuit breaker
CN106733197A (en) * 2016-12-16 2017-05-31 长兴友邦电器有限公司 A kind of high voltage power supply for suppressing protection with arcing
CN108226769A (en) * 2016-12-21 2018-06-29 伊顿公司 For the system and method in the contact service life of observation circuit cutout
US10147572B2 (en) 2016-03-11 2018-12-04 Abb Schweiz Ag Embedded pole and method of assembling same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102879735A (en) * 2012-10-11 2013-01-16 桂林电子科技大学 Online electric abrasion detecting method and system of vacuum circuit breaker
US10147572B2 (en) 2016-03-11 2018-12-04 Abb Schweiz Ag Embedded pole and method of assembling same
CN106733197A (en) * 2016-12-16 2017-05-31 长兴友邦电器有限公司 A kind of high voltage power supply for suppressing protection with arcing
CN106733197B (en) * 2016-12-16 2024-02-13 长兴友邦电器有限公司 High-voltage power supply with arcing suppression protection
CN108226769A (en) * 2016-12-21 2018-06-29 伊顿公司 For the system and method in the contact service life of observation circuit cutout

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130410

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