CN102426076A - Method for detecting vacuum degree and temperature on line by 12kV vacuum arc extinguishing chamber - Google Patents
Method for detecting vacuum degree and temperature on line by 12kV vacuum arc extinguishing chamber Download PDFInfo
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- CN102426076A CN102426076A CN2011102459653A CN201110245965A CN102426076A CN 102426076 A CN102426076 A CN 102426076A CN 2011102459653 A CN2011102459653 A CN 2011102459653A CN 201110245965 A CN201110245965 A CN 201110245965A CN 102426076 A CN102426076 A CN 102426076A
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Abstract
The invention discloses a method for detecting vacuum degree and temperature on line by a 12kV vacuum arc extinguishing chamber. A metal part of a shielding cover of the vacuum arc extinguishing chamber is fully sealed in the arc extinguishing chamber, the variation in potential of the metal part cannot be directly measured, but the variation in the potential of the shielding cover will cause variation in the potential of an electric field close to the shielding cover; the variation in the potential in the arc extinguishing chamber is indirectly measured by measuring the variation in the electric field close to the shielding cover; the variation in the potential of the shielding cover is measured through the variation in the Pockels electric field close to the shielding cover; meanwhile, on-line detection of the vacuum degree is performed. Through the method, the defects in the indirect detection of the two conventional vacuum degree on-line detection methods, namely coupling capacitance method and electro-optical conversion method, are overcome; and new vacuum degree on-line detection is provided and on-line detection of contact temperature of the vacuum arc extinguishing chamber is realized.
Description
Technical field
What the present invention relates to is power transmission and distribution circuit breaker design manufacturing technology field, presses equipment for power transmission and distribution in being applied to, and has the novel evacuated arc-chutes of 12kV of vacuum tightness, temperature online detection.
Background technology
Along with vacuum switch is used in the mesolow field more and more at large, the vacuum tightness of vacuum interrupter becomes the emphasis that the user is concerned about.Because only under certain vacuum tightness, the reliability of vacuum switch just can be guaranteed.The test of vacuum level of vacuum arc-quenching chamber has different requirement with occasion difference of living in.From big aspect, can be divided into two big types of offline inspection and online detections.The method of offline inspection has a lot, and develop also comparative maturity.Online detection will be monitored the variation of its vacuum tightness at any time under the prerequisite of not changing switch main body structure and running status.At present, also can't realize the direct measurement of vacuum tightness both at home and abroad, two kinds of indirect methods that are used for the online detection of vacuum tightness are coupling capacitance method and electro-optical conversion method.The coupling capacitance method puts forward according to the measurement of partial discharge principle.If the compressive resistance between charged contact to the intershield cover of tested vacuum interrupter descends owing to vacuum tightness reduces; Then when power-frequency voltage rises to a certain value from zero point; Equivalent capacitance between charged contact and the radome discharges, and this local discharge signal can carry out on-line monitoring through two shelf depreciation probes between radome and ground connection case shell.
The online detection of breaker temperature at present is primarily aimed at the temperature variations of isolating switch connector and bus overlapped points, does not also relate to the device and the technology that can detect the vacuum arc-extinguishing chamber contact temperature.
Summary of the invention
The objective of the invention is two kinds of existing defectives of indirect method to the online detection of above-mentioned vacuum level of vacuum arc-quenching chamber, a kind of method and vacuum interrupter and the controller thereof that can realize vacuum interrupter, the online detection of contact temperature simultaneously of the new online detection vacuum interrupter of vacuum tightness is provided.
The present invention realizes above-mentioned purpose through following technical scheme: utilize the vacuum tightness of the online detection vacuum interrupter of electrooptical technology, shown in figure.Vacuum tightness in arc-chutes just often only needs the voltage of hundreds of V just can keep the electronic current that is caused by field emission between charged contact and the intershield cover.The negative charge of radome accumulation makes its negative potential almost reach the electrode voltage peak value.When in the arc-chutes during vacuum tightness deterioration, it is big that the gas density in the arc-chutes becomes, and the electronics of field emission becomes negative ion after by gas molecule absorption.Because the negative ion quality is big, drift velocity is slow, makes above-mentioned electronic current reduce, and radome absolute value current potential reduces.When the vacuum tightness deterioration was atmospheric pressure in the arc-chutes, field emitted electron all was adsorbed as negative ion by gas molecule.The current in resistance property that forms is very little because ion drifts about under electric field; Compare and to ignore with capacity current; So under the atmospheric conditions, the radome current potential is by the dividing potential drop decision of C1 (distributed capacitance between conducting rod and the radome) and C2 (distributed capacitance between radome and the casing).Therefore, can know the deterioration process of vacuum tightness in the arc-chutes by inference through the change procedure of radome current potential.
The radome of general vacuum interrupter, metal section and part is sealed in the arc-chutes fully, and the variation of its current potential can't directly be tested.But the variation through the radome current potential can cause near the variation of the electric field radome, thus can predict the variation of radome current potential through near the Pockels electric field probe that is positioned over the radome, that is can carry out the on-line testing of vacuum tightness.
The radome electric field is meant the electric field that forms between arc-chutes insulation shell external shield position and the ground connection frame, and is when one timing of vacuum construction of switch, only relevant with system voltage.For solving the relatively poor problem of Pockels electric field probe temperature characterisitic; Duplicate three electric field probes of temperature characterisitic and electric field sensitivity have been selected for use; Be installed on respectively near the radome of vacuum switch three-phase vacuum interrupter; Three road electric field signals and ambient temperature signal are imported computing machine simultaneously compare analysis (having realized the detection of vacuum arc-extinguishing chamber contact temperature simultaneously), thereby eliminate because the temperature fluctuation errors caused.For solving inhomogeneous that three-phase arc-chutes external electrical field distributes, and then influence measures the problem of sensitivity, and the present invention inserts a high-voltage capacitance C2 in the insulated support of Pockels electric field probe.The withstand voltage height of this electric capacity, capacitance are very little, do not influence integral insulation and cooperate, but can be electric field probe one measuring basis are provided, thereby have improved the measurement sensitivity of total system.
Adopt the beneficial effect of present technique scheme: vacuum interrupter with vacuum, temperature online detection; Can realize the online detection of online detection of the indoor contact temperature of vacuum extinction and the indoor vacuum tightness of vacuum extinction simultaneously, overcome the defective of coupling capacitance and two kinds of indirect detection of light-to-current inversion.
Description of drawings
Fig. 1 has the method synoptic diagram of vacuum tightness, temperature online detection for 12KV.
Among the figure: 1-high pressure part, 2-vacuum interrupter, 3-contact, 4-radome, 5-electric field probe.
Embodiment
Online detection vacuum tightness of 12KV vacuum interrupter of the present invention and method of temperature, embodiment, the contrast accompanying drawing is explained as follows again.
As shown in Figure 1, it is made up of high-pressure section 1, vacuum interrupter 2, contact 3, radome 4, electric field probe 5, adopts temperature characterisitic and duplicate three electric field probes 5 of electric field sensitivity; Be installed in respectively near the radome 4 of vacuum switch three-phase vacuum interrupter 2; And three road electric field signals and ambient temperature signal are imported computing machine simultaneously compare analysis, realize the detection of contact 3 temperature in the vacuum interrupter 2, thereby eliminate because the temperature fluctuation errors caused; Influence measurement sensitivity in order to solve three-phase vacuum interrupter external electrical field skewness; Insert a high-voltage capacitance C2 in the insulated support of employing Pockels electric field probe 5, the withstand voltage height of this electric capacity, capacitance is very little; For electric field probe 5 provides a measuring basis, measure sensitivity thereby improve.
Claims (3)
1. online detection vacuum tightness of 12KV arc-chutes and method of temperature; The radome of vacuum interrupter; Metal section and part is sealed in the arc-chutes fully; The variation of its current potential can't directly be measured, but the variation of radome current potential can cause the variation of radome current potential, and the variation of electric field reaches the variation that predicts current potential in the arc-chutes indirectly near the radome through measuring; It is characterized in that: predict the variation of radome current potential through the variation that is arranged near the Pockels electric field the radome, carry out the online detection of vacuum tightness simultaneously.
2. online detection vacuum tightness of 12KV arc-chutes according to claim 1 and method of temperature; It is characterized in that: described radome electric field is meant the electric field that forms between arc-chutes housing shroud cover position and the ground connection frame; Vacuum switch structure one regularly, and is only relevant with system voltage, for solving Pockels electric field probe temperature characterisitic problem; Duplicate three electric field probes of temperature characterisitic and electric field sensitivity have been adopted; Be installed on respectively near the radome of vacuum switch three-phase vacuum interrupter, three road electric field signals and ambient temperature signal imported computing machine simultaneously compare analysis, realized the detection of the indoor contact temperature of vacuum extinction simultaneously.
3. online detection vacuum tightness of 12KV arc-chutes according to claim 1 and method of temperature; It is characterized in that: for solving three-phase arc-chutes external electrical field skewness; Can influence measurement sensitivity, be employed in and insert a high-voltage capacitance C2 in the insulated support of Pockels electric field probe, this electric capacity is high pressure resistant, capacitance is very little; Do not influence integral insulation and cooperate, improve the sensitivity that total system is measured for electric field probe provides a measuring basis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102459653A CN102426076A (en) | 2011-08-25 | 2011-08-25 | Method for detecting vacuum degree and temperature on line by 12kV vacuum arc extinguishing chamber |
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| CN2011102459653A CN102426076A (en) | 2011-08-25 | 2011-08-25 | Method for detecting vacuum degree and temperature on line by 12kV vacuum arc extinguishing chamber |
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| CN102426076A true CN102426076A (en) | 2012-04-25 |
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| CN2011102459653A Pending CN102426076A (en) | 2011-08-25 | 2011-08-25 | Method for detecting vacuum degree and temperature on line by 12kV vacuum arc extinguishing chamber |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474288A (en) * | 2013-06-20 | 2013-12-25 | 国家电网公司 | Method for detecting vacuum degree in arc extinguish chamber of vacuum circuit breaker |
| CN103557988A (en) * | 2013-11-09 | 2014-02-05 | 宁夏天地经纬电力设备工程有限公司 | Rotary electric field probe |
| CN104237647A (en) * | 2013-06-20 | 2014-12-24 | 沈阳工业大学 | Method and device for detecting capacitance value of shielding case of vacuum circuit breaker |
| CN104241008A (en) * | 2013-06-20 | 2014-12-24 | 沈阳工业大学 | Method and device for detecting breaking and closing positions of vacuum circuit breaker contacts |
| WO2024047840A1 (en) * | 2022-09-01 | 2024-03-07 | 日新電機株式会社 | Determination device and determination method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474288A (en) * | 2013-06-20 | 2013-12-25 | 国家电网公司 | Method for detecting vacuum degree in arc extinguish chamber of vacuum circuit breaker |
| CN104237647A (en) * | 2013-06-20 | 2014-12-24 | 沈阳工业大学 | Method and device for detecting capacitance value of shielding case of vacuum circuit breaker |
| CN104241008A (en) * | 2013-06-20 | 2014-12-24 | 沈阳工业大学 | Method and device for detecting breaking and closing positions of vacuum circuit breaker contacts |
| CN104241008B (en) * | 2013-06-20 | 2017-03-22 | 沈阳工业大学 | Method and device for detecting breaking and closing positions of vacuum circuit breaker contacts |
| CN103557988A (en) * | 2013-11-09 | 2014-02-05 | 宁夏天地经纬电力设备工程有限公司 | Rotary electric field probe |
| WO2024047840A1 (en) * | 2022-09-01 | 2024-03-07 | 日新電機株式会社 | Determination device and determination method |
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Application publication date: 20120425 |