CN103560047A - Vacuum arc-extinguishing chamber vacuum degree on-line detecting device - Google Patents
Vacuum arc-extinguishing chamber vacuum degree on-line detecting device Download PDFInfo
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- CN103560047A CN103560047A CN201310551715.1A CN201310551715A CN103560047A CN 103560047 A CN103560047 A CN 103560047A CN 201310551715 A CN201310551715 A CN 201310551715A CN 103560047 A CN103560047 A CN 103560047A
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Abstract
The invention discloses a vacuum arc-extinguishing chamber vacuum degree on-line detecting device, and belongs to the field of power grid detecting. The vacuum arc-extinguishing chamber vacuum degree on-line detecting device comprises a vacuum arc-extinguishing chamber, a magnet exciting coil, an external introduction electrode, a silicon stack, a high-voltage resistor R, a sampling resistor r and a vacuum degree on-line tester. The vacuum arc-extinguishing chamber is internally provided with a contact which is provided with a shielding case, wherein the shielding case is provided with the external introduction electrode. The contact is located in the center of the magnet exciting coil. The sampling resistor is connected with the vacuum degree on-line tester. The vacuum degree of the arc-extinguishing chamber is continuously monitored through a shielding case alternating potentiometry, and the measuring sensitivity is high to achieve several Pas, the vacuum degree of the arc-extinguishing chamber is measured on line at intervals (one time measuring is carried out every several hours) through a magnetic control discharging method between the shielding case and the contact, and the measuring sensitivity is 6*10-2Pa. The vacuum arc-extinguishing chamber vacuum degree on-line detecting device can bear 75KV impulse withstand voltage and 42KV 1min power frequency withstand voltage through the magnet exciting coil which is good in internal and external insulation performance and is used for measuring the vacuum degree of a 10KV vacuum switch.
Description
Technical field
The invention belongs to electrical network detection field, relate to vacuum level of vacuum arc-quenching chamber and detect, particularly a kind of measurement vacuum level of vacuum arc-quenching chamber on-line measuring device.
Background technology
Vacuum interrupter is the core component of vacuum switch, and it usings high vacuum as insulation and arc-extinguishing medium, and short circuit current and load current are played a part to disconnection and closed.Vacuum interrupter level of vacuum is represented by the pressure of inner residual gas, in the lower expression arc control device of pressure, vacuum degree is higher, after pressure is higher than certain value, vacuum switch will lose insulation and rupture capacity, along with improving constantly that vacuum switch operational reliability is required, the electric property of the situation of the indoor vacuum degree of monitoring vacuum extinction, assurance arc control device has become electric power system urgent problem.The vacuum-degree monitoring method of vacuum interrupter can be divided into off-line monitoring and the large class of on-line monitoring two.
At present conventional vacuum degree on-line monitoring method mainly contains screen potential method, Mini-size cold cathode magnetic control meter method, self-closing force method, discharging sound transmitting detection method, partial discharge method etc. at home.
Mini-size cold cathode magnetic control method is that microcomputer pipe is welded on a conducting rod of switching tube, makes to count tube space and is communicated with switching tube space, and the pressure values that cold cathode measures is the pressure values in switching tube.Improving one's methods is that excitation is used permanent magnetism, utilizes system high pressure and samples from the high-pressure ion post of one end ground connection.The method sensitivity is higher, but need to transform vacuum interrupter.
Self-closing force method is to utilize the principle of bellows and spring pressure balance, make the variation of the self-closing power of variable effect of vacuum pressure, by external bellows, determine the self-closing power that spring plank, balance spring, improved amesdial detect vacuum tube, thereby realize the on-line monitoring of vacuum degree, its weak point is to change the part-structure of short-circuiting device.
The shortcoming of partial discharge method or electric discharge acoustic emission detection is that detection sensitivity is lower.
Summary of the invention
The object of the invention is to solve above-mentioned practical problem, in vacuum switch production process, just at arc control device outside cover, load onto magnet exciting coil, and resolve Insulation Problems, the magnetic control discharge method that just can apply between contact and radome has been realized the on-line monitoring of vacuum degree of vacuum switch.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme: a kind of vacuum level of vacuum arc-quenching chamber on-line measuring device, comprises vacuum interrupter, magnet exciting coil, outer electrode, silicon stack, high-tension resistive R, sample resistance r, vacuum degree on-line testing instrument; The indoor contact that arranges of described vacuum extinction, described contact arranges radome, and described radome arranges outer electrode; Described contact is positioned at magnet exciting coil center, and described outer electrode is connected successively with high-tension resistive, silicon stack, sample resistance; Described sample resistance is connected with vacuum degree on-line testing instrument; Described magnet exciting coil arranges coil insulation cast and coil lead; Described vacuum degree on-line testing instrument is connected to line tester charging capacitor C and computer data acquisition and treatment system.
Described coil lead is connected to vacuum degree on-line testing instrument through after casing;
Described silicon stack is arranged on internal side of shell;
Described sample resistance is arranged on casing outside.
Operation principle: vacuum switch is under running status, it is U that closed contact is with industrial frequency AC high pressure, when arc control device vacuum pressure P<1Pa, after outer electrode access high-tension resistive R and silicon stack, its radome current potential is pulled down to closely current potential.Vacuum pressure P=1-10 in arc control device
3during Pa, between contact guide rod and radome, discharge, radome current potential is drawn high approaches contact current potential U, therefore just can detect serious deteriorated vacuum interrupter by measuring screen potential.
On-line monitoring vacuum pressure P=10
-4the vacuum interrupter of-1Pa, measuring principle is: vacuum interrupter is positioned at solenoid magnet exciting coil center, vacuum switch, under running status, while passing into pulse current more than 10ms in coil, will produce a longitudinal pulsed magnetic field in vacuum extinction chamber interior.Radome current potential is by C
1(distributed capacitance between conducting rod, contact and radome) and C
2the dividing potential drop of (electric capacity between radome outer electrode and magnetic coil), R+r (R is high-tension resistive, and r is sample resistance) determines.Between contact guide rod and radome, can produce industrial frequency AC electric field, because set up AC field almost intersects vertically with pulsed magnetic field near contact, make to be present in the indoor a small amount of free electron of vacuum extinction in the running path of anode, along electrode, spin and move, this just increased significantly electron motion path and with the collision probability of residual gas molecule, like this, when at internal pressure P=10
-4during-1Pa, in vacuum extinction chamber interior, just have a stable inferior electric discharge of the soup of synchronizeing with pulsed magnetic field, this discharging current can flow through the high-tension resistive being connected with radome, by obtaining the ionic current of half power frequency period after silicon stack, sample resistance sampling.The pressure of the size of this ionic current and vacuum extinction chamber interior is approximated to direct ratio, therefore can carry out according to the size of ionic current the vacuum degree of on-line measurement arc control device.
Beneficial effect: the present invention utilizes the radome ac potential method vacuum degree of monitoring killing arc chamber continuously, its measurement is highly sensitive, for several handkerchiefs, magnetic control discharge method between use radome and contact is the vacuum degree of on-line measurement arc control device (as measured once every several hours) discontinuously, and it measures sensitivity is 6 * 10
-2pa; There is good interior external insulation 10KV vacuum degree of vacuum switch measurement magnet exciting coil, can bear the 1min industrial frequency withstand voltage of 75KV impulse withstand voltage and 42KV.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Wherein, 1-vacuum interrupter 2-contact 3-radome 4-outer electrode 5-magnet exciting coil 6-coil insulation cast 7-coil lead 8-silicon stack 9-high-tension resistive 10-sample resistance 11-casing 12-vacuum degree on-line testing instrument 13-on-line testing instrument charging capacitor 14-computer data acquisition and treatment system
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.As shown in Figure 1, a kind of vacuum level of vacuum arc-quenching chamber on-line measuring device, comprises vacuum interrupter 1, magnet exciting coil 5, outer electrode 4, silicon stack 8, high-tension resistive 9, sample resistance 10, vacuum degree on-line testing instrument 12; The interior contact 2 that arranges of described vacuum interrupter 1, described contact 2 arranges radome 3, and described radome 3 arranges outer electrode 4; Described contact 2 is positioned at magnet exciting coil 5 centers, and described outer electrode 4 is connected successively with high-tension resistive 9, silicon stack 8, sample resistance 10; Described sample resistance 10 is connected with vacuum degree on-line testing instrument 12.
Described magnet exciting coil 5 arranges coil insulation cast 6 and coil lead 7;
Described coil lead 7 is connected to vacuum degree on-line testing instrument 12 through after casing 11;
Described silicon stack 8 is arranged on casing 11 inner sides;
Described sample resistance 10 is arranged on casing 11 outsides;
Described vacuum degree on-line testing instrument 12 is connected to line tester charging capacitor 13 and computer data acquisition and treatment system 14.
Claims (6)
1. a vacuum level of vacuum arc-quenching chamber on-line measuring device, comprises vacuum interrupter, magnet exciting coil, outer electrode, silicon stack, high-tension resistive, sample resistance, vacuum degree on-line testing instrument; It is characterized in that, the indoor contact that arranges of described vacuum extinction, described contact arranges radome, and described radome arranges outer electrode; Described contact is positioned at magnet exciting coil center, and described outer electrode is connected successively with high-tension resistive, silicon stack, sample resistance; Described sample resistance is connected with vacuum degree on-line testing instrument.
2. a kind of vacuum level of vacuum arc-quenching chamber on-line measuring device according to claim 1, is characterized in that, described magnet exciting coil arranges coil insulation cast and coil lead.
3. a kind of vacuum level of vacuum arc-quenching chamber on-line measuring device according to claim 2, is characterized in that, described coil lead is connected to vacuum degree on-line testing instrument through after casing.
4. a kind of vacuum level of vacuum arc-quenching chamber on-line measuring device according to claim 1, is characterized in that, described silicon stack is arranged on internal side of shell.
5. a kind of vacuum level of vacuum arc-quenching chamber on-line measuring device according to claim 1, is characterized in that, described sample resistance is arranged on casing outside.
6. a kind of vacuum level of vacuum arc-quenching chamber on-line measuring device according to claim 1, is characterized in that, described vacuum degree on-line testing instrument is connected to line tester charging capacitor C and computer data acquisition and treatment system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310551715.1A CN103560047A (en) | 2013-11-08 | 2013-11-08 | Vacuum arc-extinguishing chamber vacuum degree on-line detecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310551715.1A CN103560047A (en) | 2013-11-08 | 2013-11-08 | Vacuum arc-extinguishing chamber vacuum degree on-line detecting device |
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| CN103560047A true CN103560047A (en) | 2014-02-05 |
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| CN201310551715.1A Pending CN103560047A (en) | 2013-11-08 | 2013-11-08 | Vacuum arc-extinguishing chamber vacuum degree on-line detecting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109141740A (en) * | 2018-08-15 | 2019-01-04 | 苏州仁尔必思电子科技有限公司 | A kind of vacuum inspective meter of high sensitivity |
| CN112992599A (en) * | 2019-12-13 | 2021-06-18 | 天津平高智能电气有限公司 | Vacuum arc-extinguishing chamber vacuum degree measuring device |
| CN113745049A (en) * | 2021-08-27 | 2021-12-03 | 西安交通大学 | Vacuum degree monitoring method and system in vacuum arc extinguishing chamber |
-
2013
- 2013-11-08 CN CN201310551715.1A patent/CN103560047A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109141740A (en) * | 2018-08-15 | 2019-01-04 | 苏州仁尔必思电子科技有限公司 | A kind of vacuum inspective meter of high sensitivity |
| CN112992599A (en) * | 2019-12-13 | 2021-06-18 | 天津平高智能电气有限公司 | Vacuum arc-extinguishing chamber vacuum degree measuring device |
| CN112992599B (en) * | 2019-12-13 | 2023-02-17 | 天津平高智能电气有限公司 | Vacuum degree measuring device for vacuum arc extinguish chamber |
| CN113745049A (en) * | 2021-08-27 | 2021-12-03 | 西安交通大学 | Vacuum degree monitoring method and system in vacuum arc extinguishing chamber |
| CN113745049B (en) * | 2021-08-27 | 2022-07-12 | 西安交通大学 | Vacuum degree monitoring method and system in vacuum arc extinguish chamber |
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Application publication date: 20140205 |