CN102520327B - Location system for turn-to-turn insulation defect of dry type air reactor - Google Patents
Location system for turn-to-turn insulation defect of dry type air reactor Download PDFInfo
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- CN102520327B CN102520327B CN201210006501.1A CN201210006501A CN102520327B CN 102520327 B CN102520327 B CN 102520327B CN 201210006501 A CN201210006501 A CN 201210006501A CN 102520327 B CN102520327 B CN 102520327B
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Abstract
The invention discloses a location system for a turn-to-turn insulation defect of a dry type air reactor, which comprises a charging capacitor, a discharging sphere gap, a first switch, a second switch, a jam inductance and a compensating condenser which are serially connected in sequence to form a closed loop circuit, wherein the charging capacitor and the compensating condenser are respectively connected in parallel with a direct-current power supply and an alternating-current power supply, a connection point connected with one end of the dry type air reactor to be detected is arranged between the first switch and the second switch, and another connection point connected with the other end of the dry type air reactor to be detected is arranged between the charging condenser and the compensating condenser. According to the location system for the turn-to-turn insulation defect of the dry type air reactor, the defect of incapability of locating the turn-to-turn insulation defect of the dry type air reactor is overcome, the detection effect of the traditional detecting device for the present turn-to-turn insulation defect of the dry type air reactor is checked, and development and progress of the detecting device for the turn-to-turn insulation defect of the dry type air reactor detecting device are promoted.
Description
Technical field
The present invention relates to a kind of positioning system, particularly relate to a kind of positioning system of inter-turn insulation defect of dry hollow reactor.
Background technology
In prior art, in electrical network, can often there is the ablaze accident of reactor causing because of inter-turn insulation defect.At present, the means that China is detected inter-turn insulation defect of dry hollow reactor are still in experience accumulation and improve the stage, because inter-turn insulation defect of dry hollow reactor cannot position and search, limited to a great extent the development and progress of inter-turn insulation defect of dry hollow reactor detection technique.Simultaneously, because inter-turn insulation defect cannot be located, cause the inter-turn insulation defect of dry-type air-core reactor in whole service process, all cannot carry out concrete statistical study to inter-turn insulation defect, thereby also limited perfect at the improvement of configuration aspects and design aspect of reactor.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of positioning system of inter-turn insulation defect of dry hollow reactor, can accurately locate inter-turn insulation defect of dry hollow reactor.
For solving the problems of the technologies described above, the invention provides a kind of positioning system of inter-turn insulation defect of dry hollow reactor, comprise the charging capacitor that is followed in series to form closed-loop path, ball discharge gap, the first switch, second switch, block inductance and building-out capacitor, described charging capacitor, building-out capacitor is parallel connection direct power supply and AC power respectively, between described the first switch and described second switch, be provided with the tie point being connected with one end of dry-type air-core reactor to be measured, between described charging capacitor and described building-out capacitor, be provided with the tie point being connected with the other end of dry-type air-core reactor to be measured.
The essence of the technical program is to be mutually formed by stacking by power-frequency voltage circuit and high-frequency impulse oscillating voltage circuit, can realize to metallicity puncture, low-resistance punctures, high resistant punctures three kinds of different defect properties and positions.Wherein, block inductance, building-out capacitor and AC power and form power-frequency voltage circuit, ball discharge gap, charging capacitor and direct supply form high-frequency electrical pulses volt circuit.The function that the circuit that the technical program is shown is realized is that high-frequency impulse oscillating voltage and power-frequency voltage can be superimposed upon on dry-type air-core reactor to be measured simultaneously, and high-frequency impulse oscillating voltage and power-frequency voltage do not affect mutually the other side's normal operation.Meanwhile, the power-frequency voltage applying will guarantee that the voltage on dry-type air-core reactor to be measured is rated voltage, and electric current is rated current.Being applied to high-frequency impulse oscillating voltage frequency on dry-type air-core reactor to be measured and being 100kHz and following, voltage magnitude stipulates according to related request.The effect of building-out capacitor is to provide the test current of dry-type air-core reactor to be measured, the capacity requirement of reduction to power supply, the capacitance of building-out capacitor is larger, because consider the physical constraints of equipment, cannot require can bear too high high-frequency impulse oscillating voltage on building-out capacitor.The effect of AC power is to provide dry-type air-core reactor power current to be measured, and meanwhile, AC power self can not be born high-frequency impulse oscillating voltage, therefore in the circuit of the technical program, has designed obstruction inductance.The effect of blocking inductance is mainly used in bearing HF voltage, reaches the object of protection building-out capacitor and AC power.In the designed circuit of the technical program, with the design of the tie point of dry-type air-core reactor to be measured be also very important, improper if the position of tie point is selected, cannot solve this positioning system technical matters to be solved.The technical program is mainly to have set up the circuit of power-frequency voltage and the stack of high-frequency impulse oscillating voltage, and this circuit can be realized defect point temperature is sharply raise, and then by thermal infrared imager, reaches the object of defect location.
On described direct supply, be in series with current-limiting resistance.Object is that high-frequency pulse current is played to restriction.
The present invention has following useful technique effect:
(1) filled up the blank that current inter-turn insulation defect of dry hollow reactor cannot be located, realized defect is accurately located;
(2) realized the detection effect of current inter-turn insulation defect of dry hollow reactor pick-up unit has been verified, promoted the development and progress of inter-turn insulation defect of dry hollow reactor pick-up unit;
(3) will make defective locations add up and become possibility, for formulating the operation maintenance rules of dry-type air-core reactor, provide foundation, and instruct and in service dry-type air-core reactor insulating monitoring is maked an inspection tour;
(4) statistical study to defective locations, perfect by the improvement that is conducive to instruct reactor in configuration aspects, design aspect, thus further improve the operational reliability of dry-type air-core reactor, the probability that reduction accident occurs.
Accompanying drawing explanation
Fig. 1 is circuit connection schematic diagram of the present invention;
Fig. 2 is circuit design rendering of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of positioning system of inter-turn insulation defect of dry hollow reactor, comprises charging capacitor C, the ball discharge gap S, the first K switch, the second switch K that are followed in series to form closed-loop path
1, block inductance L
1with building-out capacitor C
1, described charging capacitor C, building-out capacitor C
1be connected in parallel respectively direct supply DC and AC power AC, described the first K switch and described second switch K
1between be provided with the tie point being connected with one end of dry-type air-core reactor L to be measured, described charging capacitor C and described building-out capacitor C
1between be provided with the tie point being connected with the other end of dry-type air-core reactor L to be measured.On described direct supply DC, be in series with current-limiting resistance R.Wherein, block inductance L
1rated voltage be not less than the rated voltage of tested reactor L, and inductance value is suitable with L; Building-out capacitor C
1value according to L
1determine with L, calculate according to the following formula,
the capacitance of charging capacitor C calculates according to the following formula,
f≤100kH wherein.The ball discharge gap S electric discharge of lighting a fire under given voltage, for dry-type air-core reactor L to be measured provides high-frequency impulse oscillating voltage.
As shown in Figure 2, Fig. 2 is the circuit design rendering of high-frequency impulse oscillating voltage stack power-frequency voltage of the present invention.In figure, in left-hand broken line frame, be power-frequency voltage circuit, U is power frequency supply.In the dotted line frame of right side, be high-frequency impulse oscillating voltage circuit, Udc represents the DC generator in test unit, series limiting resistor on described direct supply, and object is that high-frequency pulse current is played to restriction, thus protection DC generator.R is current-limiting resistance, and C is charging capacitor, and L is dry-type air-core reactor to be measured.S represents ball discharge gap, and the electric discharge of lighting a fire under given voltage, for dry-type air-core reactor L to be measured provides high-frequency impulse oscillating voltage.
The present invention, in design, has following points for attention: 1) block inductance L
1select, the position in circuit and block inductance L
1the selection of inductance value, selects obstruction inductance L
1fundamental purpose be as blocking inductance, making it when not affecting original oscillation circuit, block high-frequency oscillation voltage and be applied on power-frequency voltage circuit, make power-frequency voltage circuit not bear high-frequency oscillation voltage, guarantee the normal operation of power-frequency voltage circuit.2) building-out capacitor C
1select, the position in circuit and building-out capacitor C
1the selection of capacitance, building-out capacitor C
1one side is electric capacity by way of compensation, for dry-type air-core reactor L to be measured provides rated current, in parallel with power-frequency voltage circuit on the one hand, for high-frequency current provides passage, makes power frequency supply not bear high-frequency impulse oscillating voltage.
In the circuit of the present invention's design, while superposeing power-frequency voltage and high-frequency pulse voltage on dry-type air-core reactor, selecting charging capacitor C is 3000pF, current-limiting resistance R resistance is 6k Ω, the gap of adjusting ball discharge gap makes it to discharge under 7kV voltage, now on tested reactor, will produce high-frequency impulse oscillating voltage, and oscillation peak voltage is 7kV, for work frequency circuit part, block inductance L
1selecting the inductance value suitable with dry-type air-core reactor L to be measured, is 4.24mH, C
1electric capacity by way of compensation, according to oscillation frequency, dry-type air-core reactor L to be measured with block inductance L
1select, in this circuit, elect 1000uF as, because oscillation frequency is in tens of kHz left and right, now block inductance L
1upper by bearing main high-frequency impulse oscillating voltage, through simulation calculation building-out capacitor C
1on the high-frequency pulse voltage peak value that bears 2.15V only, be subject to hardly the impact of high-frequency impulse oscillating voltage, thereby guaranteed that power-frequency voltage circuit does not bear high-frequency impulse oscillating voltage.
The present invention is by the method for power-frequency voltage and high-frequency pulse voltage stack, for turn-to-turn insulation, there is the place of defect, under the effect of high-frequency pulse voltage, can make turn-to-turn form spark discharge and temporary puncturing, and the power-frequency voltage of stack can make not blow-out of breakdown between adjacent turns, both time effects can be so that turn-to-turn insulation forms continuous short-circuit condition, under the effect of electric arc, short dot temperature raises rapidly, by thermal infrared imager, defect point accurately can be located, inter-turn insulation defect point can be because of high temperature cabonization simultaneously, and follow smog, the signable position of failure point of respectively sealing accordingly.
Above-listed detailed description is for the illustrating of one of the present invention possible embodiments, and this embodiment is not in order to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, all should be contained in the scope of the claims of this case.
Claims (2)
1. the positioning system of an inter-turn insulation defect of dry hollow reactor, it is characterized in that: comprise the charging capacitor, ball discharge gap, the first switch, second switch, obstruction inductance and the building-out capacitor that are followed in series to form closed-loop path, described charging capacitor, building-out capacitor be parallel connection direct power supply and AC power respectively, between described the first switch and described second switch, be provided with the tie point being connected with one end of dry-type air-core reactor to be measured, between described charging capacitor and described building-out capacitor, be provided with the tie point being connected with the other end of dry-type air-core reactor to be measured.
2. the positioning system of inter-turn insulation defect of dry hollow reactor according to claim 1, is characterized in that: on described direct supply, be in series with current-limiting resistance.
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| CN201210006501.1A CN102520327B (en) | 2012-01-10 | 2012-01-10 | Location system for turn-to-turn insulation defect of dry type air reactor |
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| CN201210006501.1A CN102520327B (en) | 2012-01-10 | 2012-01-10 | Location system for turn-to-turn insulation defect of dry type air reactor |
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| CN102520327B true CN102520327B (en) | 2014-01-22 |
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| CN102981111B (en) * | 2012-12-24 | 2014-11-26 | 宁波电业局 | Interturn insulation detector for dry air reactor |
| CN110824311A (en) * | 2019-11-22 | 2020-02-21 | 南京信息工程大学 | Zinc oxide valve plate breakdown point detection device and method based on image recognition |
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| US3968426A (en) * | 1974-04-22 | 1976-07-06 | James G. Biddle Company | Method of A.C. insulation testing utilizing a variable inductive reactor in parallel with a test specimen |
| CN201133925Y (en) * | 2007-09-19 | 2008-10-15 | 郑役军 | Turn-to-turn short circuit test device |
| CN201681133U (en) * | 2010-05-12 | 2010-12-22 | 江少成 | Dry-type reactor interturn insulation detection device |
| CN202393873U (en) * | 2012-01-10 | 2012-08-22 | 广东电网公司电力科学研究院 | Positioning system for positioning interturn insulation defect of dry-type air-core reactor |
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