CN110534376A - Vacuum tube vacuum-degree monitoring device method and monitoring method in load ratio bridging switch - Google Patents
Vacuum tube vacuum-degree monitoring device method and monitoring method in load ratio bridging switch Download PDFInfo
- Publication number
- CN110534376A CN110534376A CN201910952085.6A CN201910952085A CN110534376A CN 110534376 A CN110534376 A CN 110534376A CN 201910952085 A CN201910952085 A CN 201910952085A CN 110534376 A CN110534376 A CN 110534376A
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- Prior art keywords
- vacuum
- vacuum tube
- current waveform
- degree
- switch
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/668—Means for obtaining or monitoring the vacuum
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0038—Tap change devices making use of vacuum switches
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- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses vacuum tube vacuum-degree on-line monitoring method and device in a kind of implanted on-load tap changer, device includes that successively cascade induction coil, signal amplifier, filter, controller, controller are used to control motor drive mechanism；Controller judges vacuum tube vacuum-degree by the variation of Cutoff current waveform, will stop motor drive mechanism after finding current anomaly, and terminate the movement of load ratio bridging switch.Method includes the steps that the monitoring by the variation of current waveform to vacuum tube vacuum-degree.Benefit of the invention is suitable for the monitoring of various vacuum tube vacuum-degrees; induction coil and lead-out wire are all built in switch insulation wall inner portion by it; electromagnetic field and the temperature field of Switch main body structure and switch internal are not influenced, while the barrel that insulate also can protect induction coil and lead-out wire.
Description
Technical field
The present invention relates to vacuum in a kind of vacuum degree monitoring device and monitoring method more particularly to a kind of load ratio bridging switch
Pipe vacuum degree monitoring device and monitoring method belong to on-line monitoring and the early warning technology field of electrical equipment fault.
Background technique
Load ratio bridging switch be the necessary equipment of electric system, it can be achieved that not cutting off load under conditions of adjust voltage, pass
Load ratio bridging switch of uniting is mechanical contact.And the load ratio bridging switch of vacuum tube is utilized, the switching of electric arc occurs true
In blank pipe, since vacuum contact has connecting-disconnecting function strong, the arcing time is short, and arc voltage is low, and the contact service life is long, does not pollute insulating oil etc.
Advantage.Tradition machinery switch contacts are gradually substituted using the vacuum on-load operation switch of vacuum tube.
The vacuum degree that vacuum tube is is to guarantee its premise worked normally, when vacuum degree is lower than 1.33 × 10-5, is needed
Replace vacuum tube.The conventional method of vacuum degree measurement is to remove vacuum tube, applies voltage at contact both ends, by measuring ion-conductance
Stream judges house vacuum degree.This method needs to disassemble switch, time and effort consuming.
Vacuum pipe shell some at present in vacuum on-load operation switch is for example ceramic for nontransparent insulating materials, therefore
Its " a kind of device of non-destructive testing vacuum tube vacuum-degree " for not being available Chinese patent CN105355506A announcement,
" a kind of method of laser method optical path difference non-destructive testing vacuum tube vacuum-degree ", the CN105509959A public affairs that CN105513888A is announced
A kind of " method of laser method non-destructive testing vacuum tube vacuum-degree " of cloth detects its vacuum degree.
" the vacuum tube vacuum-degree online test method and dress in vacuum on-load operation switch that CN107170639A is announced
Set " by detection switch, whether in switching, whether to have arc light normal to detect the vacuum degree of vacuum tube.The program needs
Static contact nearby installs light sensing element in switch and subsequent extraction optical fiber, these components are placed on opening for strong-electromagnetic field
Portion inside the Pass will affect switch internal magnetic distribution and thermo parameters method, may be to switch while realizing detection function
Operation brings risk, and the mode of this open arrangement is it is also possible that sensor itself is influenced by environment.
Summary of the invention
The technical problem to be solved in the present invention is to provide vacuum tube vacuum-degree monitoring device in a kind of load ratio bridging switch and
Monitoring method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
Technical solution one: vacuum tube vacuum-degree monitoring device in a kind of load ratio bridging switch, including successively cascade induction
Coil, signal amplifier, filter, controller, induction coil are embedded in insulating cylinder, are placed around static contact, for incuding
Flow through the electric current of static contact；Controller is by determining that vacuum tube vacuum-degree is sentenced in the current waveform variation of filter output
It is disconnected, stop motor drive mechanism in current anomaly, terminates the movement of load ratio bridging switch.
Further, signal amplifier, filter and controller are placed in integral box, and integral box is placed in switch top.
Technical solution two: vacuum tube vacuum-degree monitoring method in a kind of load ratio bridging switch, including pass through detection current wave
The step of variation of shape carrys out the monitoring to vacuum tube vacuum-degree, judges that the step of current waveform exception is as follows:
Step 1: the current waveform x of record switch motion process, record duration are fixed；
Step 2: the current waveform y of the switch motion process of record duration same as current waveform x；
Step 3: the normalized-cross-correlation function of calculating current waveform x and current waveform y, N is waveform points in formula:
Step 4: the normalized-cross-correlation function of current waveform x and current waveform y are greater than preset decision threshold, vacuum tube
Normally, otherwise vacuum tube is abnormal.
Having the technical effect that acquired by by adopting the above technical scheme
1, the present invention utilizes electric current of the induction coil being wound on around static contact to switching when to measure, and passes through
The on-line monitoring to vacuum tube vacuum-degree, the monitoring suitable for various vacuum tube vacuum-degrees are realized in the variation of current waveform.
2, induction coil and lead-out wire are all built in switch insulation wall inner portion by the present invention, do not influence Switch main body
The electromagnetic field and temperature field of structure and switch internal, while the barrel that insulate also can protect induction coil and lead-out wire.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the circuit diagram of load ratio bridging switch；
Fig. 2 is the induction coil connection schematic diagram of the embodiment of the present invention 1；
Fig. 3 is the functional block diagram of the embodiment of the present invention 1；
Fig. 4 is the circuit diagram of the embodiment of the present invention 1.
Specific embodiment
Embodiment 1:
As shown in Figure 1, vacuum tube vacuum-degree monitoring device in a kind of load ratio bridging switch, including the successively cascade line of induction
Circle, signal amplifier, filter, controller, induction coil are embedded in insulating cylinder, are placed around static contact, and induced flow is used for
Cross the electric current of static contact；Controller is changed by the current waveform of judgement filter output judges vacuum tube vacuum-degree,
Stop motor drive mechanism in current anomaly, terminates the movement of load ratio bridging switch.
Further, signal amplifier, filter and controller are placed in integral box, and integral box is placed in switch top.
As shown in Figure 1, load ratio bridging switch includes insulating cylinder, static contact, main vacuum tube MSV, main contact MTS, auxiliary vacuum
Pipe TTV, auxiliary contact TTS, transition resistance R, static contact are arranged on insulating cylinder side wall；Induction coil is embedded in insulating cylinder, around
It is placed in around static contact, the electric current of static contact is flowed through in induction.Switch motion timing diagram is as shown in figure 4, be switch shown in figure
Change primary overall process from high tap position (n+1 grades) to low-grade location (n).MSV represents main vacuum tube, and MTS represents main contact, TTV
Auxiliary vacuum tube is represented, TTS represents auxiliary contact, and R is transition resistance.Main vacuum tube MSV and auxiliary vacuum tube TTV are responsible for arc extinguishing, main touching
Head MTS and auxiliary contact TTS then guarantees that electric current circulates always.Arrow direction indicates current direction in Fig. 4, in the whole process load
It does not cut off.It should be noted that electric current flows mainly through major loop when main and auxiliary circuit is all connected to, such as process 1,5,9.In
In process 5, due to the presence of step voltage, there is circulation between major-minor circuit.
As described above, the current waveform that vacuum tube is flowed through in breaking arc will produce if vacuum tube vacuum-degree declines
The current waveform related coefficient of changing, each secondary switch motion process of measurement reduces, such as when the reduction of MSV vacuum degree, then exists
In Fig. 4 process 2 and 5 electric current of process will from it is different under normal circumstances, this variation can be detected by induction coil.In turn
Realize the monitoring to vacuum tube vacuum-degree.
The electric current when present invention is by using the induction coil being wound on around static contact to switching measures, and passes through
The on-line monitoring to vacuum tube vacuum-degree is realized in the variation of current waveform, advantage of the invention is that by induction coil and extraction
Line is all built in switch insulation wall inner portion, since insulation barrel primarily serves support and insulating effect and its design margin very
Greatly, on the one hand this modes of emplacement does not influence electromagnetic field and the temperature field of Switch main body structure and switch internal, on the other hand
Insulation barrel also can protect induction coil and lead-out wire.
Embodiment 2:
A kind of monitoring method for vacuum tube vacuum-degree monitoring device in load ratio bridging switch described in embodiment 1, packet
The step of including through the variation of detection current waveform come monitoring to vacuum tube vacuum-degree.
Judge that the step of current waveform exception is as follows:
Step 1: the current waveform x of record switch motion process, record duration are fixed；The present embodiment is 1s；
Step 2: the current waveform y of the switch motion process of record duration same as current waveform x；
Step 3: the normalized-cross-correlation function of calculating current waveform x and current waveform y, N is waveform points in formula:
Step 4: the normalized-cross-correlation function of current waveform x and current waveform y are greater than preset decision threshold, vacuum tube
Normally, otherwise vacuum tube is abnormal.
The preset decision threshold of the present embodiment is 0.5.
Claims (3)
1. vacuum tube vacuum-degree monitoring device in a kind of load ratio bridging switch, it is characterised in that: including the successively cascade line of induction
Circle, signal amplifier, filter, controller, induction coil are embedded in insulating cylinder, are placed around static contact, and induced flow is used for
Cross the electric current of static contact；Controller is changed by the current waveform of judgement filter output judges vacuum tube vacuum-degree,
Stop motor drive mechanism in current anomaly, terminates the movement of load ratio bridging switch.
2. a kind of monitoring method for vacuum tube vacuum-degree monitoring device in load ratio bridging switch described in claim 1,
It is characterized in that: including the steps that through the variation of detection current waveform come the monitoring to vacuum tube vacuum-degree.
3. the monitoring method of vacuum tube vacuum-degree monitoring device, feature in load ratio bridging switch according to claim 2
It is: judges that the step of current waveform exception is as follows:
Step 1: the current waveform x of record switch motion process, record duration are fixed；The present embodiment is 1s；
Step 2: the current waveform y of the switch motion process of record duration same as current waveform x；
Step 3: the normalized-cross-correlation function of calculating current waveform x and current waveform y, N is waveform points in formula:
Step 4: the normalized-cross-correlation function of current waveform x and current waveform y are greater than preset decision threshold, and vacuum tube is just
Often, otherwise vacuum tube is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952085.6A CN110534376A (en) | 2019-10-09 | 2019-10-09 | Vacuum tube vacuum-degree monitoring device method and monitoring method in load ratio bridging switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952085.6A CN110534376A (en) | 2019-10-09 | 2019-10-09 | Vacuum tube vacuum-degree monitoring device method and monitoring method in load ratio bridging switch |
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| CN110534376A true CN110534376A (en) | 2019-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910952085.6A Pending CN110534376A (en) | 2019-10-09 | 2019-10-09 | Vacuum tube vacuum-degree monitoring device method and monitoring method in load ratio bridging switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111222796A (en) * | 2020-01-09 | 2020-06-02 | 西安交通大学 | Method and device for measuring vacuum degree of LNG pipeline based on temperature field principle, storage medium and terminal equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855449A (en) * | 2016-11-23 | 2017-06-16 | 国家电网公司 | Based on magnetic charging theory high-pressure vacuum breaker arc-chutes vacuum degree measurement system |
| CN107170639A (en) * | 2017-06-21 | 2017-09-15 | 上海华明电力设备制造有限公司 | Vacuum tube vacuum-degree online test method and device in vacuum on-load operation switch |
| CN208109331U (en) * | 2018-04-16 | 2018-11-16 | 成都科瑞尔低温设备有限公司 | A kind of vacuum intelligent on-line detecting system |
| CN208173487U (en) * | 2018-05-02 | 2018-11-30 | 厦门涛福精密机械有限公司 | A kind of pole that can survey vacuum degree |
-
2019
- 2019-10-09 CN CN201910952085.6A patent/CN110534376A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855449A (en) * | 2016-11-23 | 2017-06-16 | 国家电网公司 | Based on magnetic charging theory high-pressure vacuum breaker arc-chutes vacuum degree measurement system |
| CN107170639A (en) * | 2017-06-21 | 2017-09-15 | 上海华明电力设备制造有限公司 | Vacuum tube vacuum-degree online test method and device in vacuum on-load operation switch |
| CN208109331U (en) * | 2018-04-16 | 2018-11-16 | 成都科瑞尔低温设备有限公司 | A kind of vacuum intelligent on-line detecting system |
| CN208173487U (en) * | 2018-05-02 | 2018-11-30 | 厦门涛福精密机械有限公司 | A kind of pole that can survey vacuum degree |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111222796A (en) * | 2020-01-09 | 2020-06-02 | 西安交通大学 | Method and device for measuring vacuum degree of LNG pipeline based on temperature field principle, storage medium and terminal equipment |
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Application publication date: 20191203 |
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| RJ01 | Rejection of invention patent application after publication |