CN110007219A - A kind of vacuum circuit breaker arcing time on-line monitoring method - Google Patents
A kind of vacuum circuit breaker arcing time on-line monitoring method Download PDFInfo
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- CN110007219A CN110007219A CN201910237105.1A CN201910237105A CN110007219A CN 110007219 A CN110007219 A CN 110007219A CN 201910237105 A CN201910237105 A CN 201910237105A CN 110007219 A CN110007219 A CN 110007219A
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- circuit breaker
- vacuum circuit
- angular displacement
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- breaker
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The present invention is a kind of vacuum circuit breaker arcing time on-line monitoring method, is related to a kind of vacuum circuit breaker electrical endurance on-line monitoring method.The present invention is that a kind of method of electric life for monitoring vacuum circuit breaker on-line is proposed from a brand-new angle, this method and existing judgment method there is no with source problem and this method be to the vacuum circuit breaker starting the arc moment it is direct detect rather than indirect detection method.This method has comprehensively considered various factors from many aspects such as device design, installation site, safety, anti-interferences, improves the accuracy, accuracy and anti-interference ability of this method；It selects angular displacement sensor and Rogowski coil current sensor as signal pickup assembly, realizes the accurate positionin that the rigid timesharing of contacts for vacuum-break switches is carved.In addition, cost needed for this method is relatively low, practical, it is also convenient for being installed on operation vacuum circuit breaker at present, is suitble to promote the use of.
Description
Technical field
The present invention relates to power system measurings to monitor field, when specially designing a kind of on-line monitoring vacuum circuit breaker starting the arc
It carves and the blow-out moment is for judging the method for electric life.
Background technique
Vacuum circuit breaker especially plays highly important role in middle pressure field in electric system, play control and
The double action of protection, Performance And Reliability are directly related to the safety and stablization of electric system；But it in recent years, is answered in the first batch
Vacuum circuit breaker gradually steps into aging, and service life problem is increasingly prominent；The service life of vacuum circuit breaker is general
It include: mechanical life, storage life and electric life, wherein electric life is the key factor for determining its service life；Studies have shown that
Its electric life is mainly determined by contact electrical wear.The method of measurement vacuum circuit breaker electrical wear at present mainly has: drop-out current adds
Weigh accumulative, monitoring contact thickness abrasion condition etc.；But each phase electrical wear practical for measurement of these methods have it is certain
Limitation；Therefore, it needs to study a kind of new method that can monitor vacuum circuit breaker electrical endurance on-line, it is disconnected to make up existing vacuum
The deficiency of road device electrical wear on-line monitoring technique, improves the reliability of Operation of Electric Systems.
The method of measurement vacuum circuit breaker electrical wear at present mainly has: drop-out current weighted accumulation method, monitoring contact thickness
Abrasion condition.Drop-out current weighted accumulation method determines that electrical wear is one of the method being most widely used, and mainly includes following several
Kind method judges drop-out current duration and drop-out current virtual value in interrupting process: the electric life curve based on breaker
(N-Ib) drop-out current weighted accumulation method, actually use average statistics method, touching is calculated as reference value using average value
The accumulative abrasion loss of head, such method do not account for drop-out current virtual value and arcing time and reference value in practical interrupting process
Difference, computational accuracy increases with the increase of open and close times；Utilize the drop-out current of contact folding auxiliary node signal
Weighted accumulation method, but the movement of auxiliary node has the actuation time of certain delay and auxiliary contact dispersibility big, leads to the starting the arc
The determination at moment has very big error；Determine the drop-out current weighted accumulation method at starting the arc moment using magnetic field signal, when starting the arc can
Stronger signal is detected using magnet field probe, using this signal as the input of trigger, is come with the output signal of trigger true
Determine the arcing time, but this method has ignored the asynchrony of three-phase, the arcing time of first split-phase can only be accurately detected；Utilize electricity
Flow sensor measures the drop-out current weighted accumulation method of opening coil electric current, and this method goes out current moment with opening coil maximum current
As the starting the arc moment, but the asynchrony of three-phase is also had ignored, and the arcing time that this method determines includes the super of contact
The running time.
It is also a kind of method for monitoring electrical contact endurance by device monitoring contact thickness abrasion condition, mainly there is following two
Kind mode: one is the abrasion condition for passing through laser monitoring contact, another kind is the abrasion feelings that contact is monitored by reflection unit
Condition.But both methods all needs the device of additional setting structure complexity, is unfavorable for the miniaturization and economy of vacuum circuit breaker.
Summary of the invention
The purpose of the present invention is in order to overcome the deficiencies of the prior art, propose one kind to monitor vacuum circuit breaker electricity on-line
The method in service life, this method consider the difference and the difference at practical starting the arc moment of three-phase drop-out current, have anti-electromagnetism dry
It disturbs, accuracy is high, at low cost, simple operation and other advantages.
The purpose of the present invention is achieved through the following technical solutions:
Step 1: the spindle angular displacement-time curve and dynamic resistance curve of measurement vacuum circuit breaker, determine and just divide
The spindle angular displacement at moment.
Under normal circumstances, nearby available space is larger for the main shaft of vacuum circuit breaker operating mechanism, being capable of easily established angle
Displacement sensor, and main shaft is in ground potential, far from high-pressure section, the problem of isolation there is no high potential.Therefore in vacuum
A kind of angular displacement sensor of the conductive plastic potentiometer composition of precision, schematic device such as Fig. 1 are installed on the main shaft of breaker
Shown, the main shaft of sensor and the main shaft of breaker are fastenedly connected by connector, before breaker factory, are passed by angular displacement
Sensor acquires angular displacement-time signal of main axis during separating brake.The sensor has the very high measurement linearity and resolution
Rate additionally has many advantages, such as that mechanical life is long, staring torque is small, strong shock resistance, cheap, therefore fully meets disconnected
The requirement of road device mechanical property on-line monitoring.
By the dynamic electric resistor signal in the breaker interrupting process before dynamic resistance method measurement factory, above-mentioned two-way is believed
It in number incoming single-chip microcontroller and is plotted in same reference axis, as shown in Fig. 2, separating brake process can be divided into three phases (is with A, B
Boundary): the first stage is the contact overtravel stage, and second stage is contact action to opening away from the stage, and the phase III is separating brake rebound
Stage.It can determine that the angular displacement ω of main axis is carved in rigid timesharing from Fig. 2FAnd mark in single-chip microcontroller, it is online as determining
The foundation that the running rigid timesharing of the dynamic and static contact of breaker is carved.
It is bent by straight-line displacement-time relationship of the available corresponding moving contact of angular displacement-time curve of main shaft
Line, and then the mechanical properties parameter such as can calculate clearance between open contacts, closing speed, opening velocity.
Step 2: the short circuit current of measurement vacuum circuit breaker.
Rogowski coil is a kind of common, sensor for measuring heavy impulse current, big with measurement range,
The advantages that pass band, insulation system are simple, the linearity is good；One is respectively set on the flange of each phase of vacuum circuit breaker
Rogowski coil, schematic device, will as shown in figure 3, acquire the short circuit current signal of each phase by Rogowski coil
The short circuit current signal measured is passed in single-chip microcontroller.
Step 3: the starting the arc and the blow-out moment of calibration vacuum circuit breaker.
Spindle angular when being acted every time by the breaker that angular displacement sensor and Rogowski coil acquire on-line operation
Displacement versus time signal and short circuit current signal are passed in single-chip microcontroller and handle, the angular displacement number carved in conjunction with preset rigid timesharing
Value, above-mentioned signal is plotted in same reference axis, as shown in figure 4, so that it is determined that starting the arc moment t1, blow-out moment t2With cut-off
Current effective value ib(t)。
Step 4: calculating each phase contact of vacuum circuit breaker adds up electrical wear amount.
Single-phase contact is obtained by following formula in the drop-out current weighted cumulative method of meter and arcing time and adds up electrical wear
Amount:
Wherein, t1It is starting the arc moment (unit: s)；t2It is blow-out moment (unit: s)；ibIt (t) is that single-phase n-th cut-offs electricity
Flow valuve (unit: A)；Wherein Knw, β be constant；N is positive integer；Sum is cut-off in N expression；QnIndicate accumulative electrical wear amount.
Compared with prior art, the invention has the following beneficial technical effects:
1, it monitors on-line: vacuum circuit breaker open and close times, arcing current duration and current waveform etc. is grown
Phase continuously monitors on-line；
2, three-phase monitors respectively: the difference of practical drop-out current and arcing time between three-phase is considered, to vacuum circuit breaker
Device three-phase is monitored respectively simultaneously, can more be truly reflected the electrical wear situation of each phase, avoids replacement open circuit in advance
Device causes economic loss or replacement to cause power grid accident not in time；
3, it predicts operational limit: its fortune is determined according to the electrical wear total amount accumulated in each phase operation of on-line monitoring breaker
Limit by row value facilitates user according to the historical data analysis of the operational limit value and the arcing current monitored its residue electric longevity
Life.
Detailed description of the invention
1. Fig. 1 is angular displacement sensor scheme of installation, wherein each section entitled [1: the main shaft 2 of operating mechanism: connection
Part 3: angular displacement sensor].
2. Fig. 2 is that the determining figure of angular displacement is carved in rigid timesharing, wherein each parameter is [ωF: the angular displacement t of main shaft is carved in rigid timesharing1: it rises
The arc moment].
3. Fig. 3 is Rogowski coil scheme of installation, wherein each section entitled [1: upper wire outlet seat 2: bellows 3: soft
Connect 4: flange 5:Rogowski coil 6: insulated pull rod].
4. Fig. 4 is the calibration maps of the starting the arc and arcing moment, wherein each parameter is [ωF: the angular displacement t of main shaft is carved in rigid timesharing1:
Starting the arc moment t2: the blow-out moment].
Specific embodiment
The purpose of the present invention is realized by following steps:
Step 1: installing sensor according to mode shown in Fig. 3.
Step 2: the spindle angular displacement-time curve and dynamic resistance curve of measurement vacuum circuit breaker, determine and just divide
The spindle angular displacement at moment.
Step 3: the short circuit current of measurement vacuum circuit breaker.
Step 4: the starting the arc and the blow-out moment of calibration vacuum circuit breaker.
Step 5: calculating each phase contact of vacuum circuit breaker adds up electrical wear amount.
The key point of the application motion and point to be protected
Key point: the present invention uses angle position as criterion, the present invention at starting the arc moment using the angular displacement of main axis
Displacement sensor acquires breaker using Rogowski coil as the measuring tool of measurement micro angular displacement, the present invention and cut-offs electricity
Stream, the present invention integrates collected spindle angular displacement-time signal using single-chip microcontroller and drop-out current signal obtains practical arcing
Time.
Protect point: criterion of 1. present invention using the angular displacement of main axis as the starting the arc moment；
2. measuring tool of the present invention using angular displacement sensor as measurement micro angular displacement；
3. the present invention acquires breaker drop-out current using Rogowski coil；
4. the present invention integrates collected spindle angular displacement-time signal using single-chip microcontroller and drop-out current signal obtains reality
The border arcing time.
Claims (3)
1. spindle angular displacement-time curve and dynamic resistance curve measurement of vacuum circuit breaker, which is characterized in that true
A kind of angular displacement sensor of the conductive plastic potentiometer composition of precision is installed, device shows on the main shaft of empty circuit breaker operation mechanism
It is intended to as shown in Figure 1, acquiring angular displacement-time signal of main axis during separating brake by angular displacement sensor；By dynamic
Above-mentioned two paths of signals is passed in single-chip microcontroller and is plotted in same seat by the dynamic electric resistor signal in state resistance measurement interrupting process
In parameter, as shown in Fig. 2, determining that the angular displacement ω of main axis is carved in rigid timesharingFAnd mark in single-chip microcontroller, it is online as determining
The foundation that the running rigid timesharing of the dynamic and static contact of breaker is carved.
2. the measurement of the short circuit current of vacuum circuit breaker, which is characterized in that be arranged one on the flange of each phase of vacuum circuit breaker
Rogowski coil, schematic device, will as shown in figure 3, acquire the short circuit current signal of each phase by Rogowski coil
The short circuit current signal measured is passed in single-chip microcontroller described in claim 1.
3. the starting the arc and the calibration at blow-out moment of vacuum circuit breaker, which is characterized in that the breaker for acquiring on-line operation moves every time
Spindle angular displacement-time signal and short circuit current signal when making, are passed in single-chip microcontroller described in claim 1, in conjunction with preparatory
The angular displacement numerical value that the rigid timesharing of setting is carved, above-mentioned signal is plotted in same reference axis, as shown in figure 4, so that it is determined that rising
Arc moment t1, blow-out moment t2With drop-out current virtual value ib(t)。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910237105.1A CN110007219B (en) | 2019-03-27 | 2019-03-27 | Online monitoring method for arcing time of vacuum circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237105.1A CN110007219B (en) | 2019-03-27 | 2019-03-27 | Online monitoring method for arcing time of vacuum circuit breaker |
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| CN110007219A true CN110007219A (en) | 2019-07-12 |
| CN110007219B CN110007219B (en) | 2020-11-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849611A (en) * | 2019-11-29 | 2020-02-28 | 国网山东省电力公司青岛供电公司 | Method for on-line detection of mechanical characteristics of circuit breaker by using switch radiation field |
| CN111579977A (en) * | 2020-05-13 | 2020-08-25 | 河南省高压电器研究所有限公司 | Method for measuring arcing time of circuit breaker |
| CN111999641A (en) * | 2020-08-07 | 2020-11-27 | 广安电气检测中心(广东)有限公司 | Method and system for measuring rigid point in short circuit breaking experiment of circuit breaker |
| CN116625667A (en) * | 2023-07-25 | 2023-08-22 | 川开电气有限公司 | Online monitoring method for mechanical characteristics of 10kV vacuum circuit breaker |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0482547A1 (en) * | 1990-10-22 | 1992-04-29 | Gec Alsthom Sa | Circuit breaker with arc detection |
| CN203705604U (en) * | 2013-11-26 | 2014-07-09 | 国家电网公司 | High-voltage circuit breaker status on-line monitoring system |
| CN207441606U (en) * | 2017-11-28 | 2018-06-01 | 常熟开关制造有限公司(原常熟开关厂） | A kind of breaker rotating axis angular displacement gathers structure |
-
2019
- 2019-03-27 CN CN201910237105.1A patent/CN110007219B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0482547A1 (en) * | 1990-10-22 | 1992-04-29 | Gec Alsthom Sa | Circuit breaker with arc detection |
| CN203705604U (en) * | 2013-11-26 | 2014-07-09 | 国家电网公司 | High-voltage circuit breaker status on-line monitoring system |
| CN207441606U (en) * | 2017-11-28 | 2018-06-01 | 常熟开关制造有限公司(原常熟开关厂） | A kind of breaker rotating axis angular displacement gathers structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849611A (en) * | 2019-11-29 | 2020-02-28 | 国网山东省电力公司青岛供电公司 | Method for on-line detection of mechanical characteristics of circuit breaker by using switch radiation field |
| CN111579977A (en) * | 2020-05-13 | 2020-08-25 | 河南省高压电器研究所有限公司 | Method for measuring arcing time of circuit breaker |
| CN111999641A (en) * | 2020-08-07 | 2020-11-27 | 广安电气检测中心(广东)有限公司 | Method and system for measuring rigid point in short circuit breaking experiment of circuit breaker |
| CN116625667A (en) * | 2023-07-25 | 2023-08-22 | 川开电气有限公司 | Online monitoring method for mechanical characteristics of 10kV vacuum circuit breaker |
| CN116625667B (en) * | 2023-07-25 | 2023-11-14 | 川开电气有限公司 | Online monitoring method for mechanical characteristics of 10kV vacuum circuit breaker |
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| CN110007219B (en) | 2020-11-10 |
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