CN102879719A - Method and circuit for quickly searching insulation faults of electrical equipment - Google Patents
Method and circuit for quickly searching insulation faults of electrical equipment Download PDFInfo
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- CN102879719A CN102879719A CN2012103774965A CN201210377496A CN102879719A CN 102879719 A CN102879719 A CN 102879719A CN 2012103774965 A CN2012103774965 A CN 2012103774965A CN 201210377496 A CN201210377496 A CN 201210377496A CN 102879719 A CN102879719 A CN 102879719A
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Abstract
The invention discloses a circuit for quickly searching insulation faults of electrical equipment. The circuit comprises an adjustable high-voltage direct-current power source E, a positive output end of the adjustable high-voltage direct-current power source E is connected with one end of a resistor R through a switch K, the other end of the resistor R is connected with a connection position at one end of a capacitor C through a discharge sphere gap and a fault winding, and the fault winding, the capacitor C and a negative output end of the adjustable high-voltage direct-current power source are grounded. The invention further discloses a method of using the circuit for quickly searching insulation faults of electrical equipment. The circuit realizes automatic continuous discharge at a certain time interval, enables complete duplication of the discharge process, has the advantages of practicality, quickness and accuracy, and is capable of precisely positioning the insulation faults of the electrical equipment.
Description
Technical field
The present invention relates to a kind of circuit and method of fast finding insulation of electrical installation fault.
Background technology
In the electric system electrical equipment malfunction, insulation fault has accounted for the overwhelming majority, and when insulation fault occurs, how to find out the definite position of trouble spot, become the matter of utmost importance of fault handling, otherwise fault handling is not just known where to begin.And this is a difficult problem technically always, before the technology of our invention, does not have effective technology.Traditional technology can only be qualitative, and can not accurately locate.Such as there is insulation fault in electrical equipment, and our height by the measuring equipment insulation resistance is judged insulation of electrical installation character, if the insulation against ground resistance ratio is lower or close to zero, the insulation against ground fault is described, but can not determine the definite position of trouble spot.The technology that adopts at present according to the optimum seeking method principle, need to be cut apart electrical equipment.Such as cable fault, cut off from the centre first, get rid of half, by that analogy, cable will be divided into some sections, badly damaged cable, the recovery difficulty is large, needs to consume a large amount of manpower, material, even in most of the cases, it is unallowed doing like this, and has stayed hidden danger for the later transmission operation of equipment.
In existing technology of searching the insulation of electrical installation fault, all can not find fast and accurately the insulation of electrical installation fault, nor can accurately locate the insulation of electrical installation fault, and search the device structure complexity of insulation of electrical installation fault.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, and a kind of circuit and method of fast finding insulation of electrical installation fault is provided, and it has the advantage of practicality, rapidity and accuracy.
To achieve these goals, the present invention adopts following technical scheme:
A kind of circuit of fast finding insulation of electrical installation fault, it comprises adjustable high voltage D. C, the positive output end of adjustable high voltage D. C is connected with an end of resistance R by K switch, the end of the other end of resistance R and capacitor C, the other end of resistance R is connected the negative output terminal ground connection of fault winding, capacitor C and adjustable high voltage D. C with the tie point of capacitor C one end with the fault winding by ball discharge gap Q.
The disruptive discharge voltage in described ball discharge gap is a little more than the disruptive discharge voltage of trouble spot.
Based on a kind of method of a kind of fast finding insulation of electrical installation of circuit fault of fast finding insulation of electrical installation fault, concrete steps are:
The first step: regulate the sparking voltage of ball discharge gap Q, make the disruptive discharge voltage of ball discharge gap Q a little more than the disruptive discharge voltage of trouble spot;
Second step: the circuit that connects fast finding insulation of electrical installation fault;
The 3rd step: the K that closes a switch, adjustable high voltage D. C E, resistance R, capacitor C form charge circuit, and adjustable high voltage D. C E is to capacitor C charging, and capacitor C voltage U is pressed the index law rising from zero with t in time;
The 4th step: when the voltage U on the capacitor C rises to the disruptive discharge voltage of ball discharge gap Q, ball discharge gap Q begins discharge, the electric energy that is stored in capacitor C discharges to the trouble spot by ball discharge gap Q, the place, trouble spot produces acoustooptic effect, according to the acoustooptic effect that the trouble spot produces, be easy to find the position of trouble spot.
The voltage U at the described capacitor C two ends in time variation relation of t is:
U=E[1-exp(-t/τ)]
Wherein, E is adjustable high voltage D. C voltage, and exp=2,718 is constant, and τ=RC is time constant, and t is the time.
In the described step 4, when the end of capacitor C discharge process, adjustable high voltage D. C E begins again to charge to capacitor C, through behind the certain hour, when the voltage on the capacitor C reached the disruptive discharge voltage of ball discharge gap Q again, discharge occured again, so repeatedly carries out.
This circuit of the present invention's design, realized automatically, had the discharge certain hour interval, continuous, make discharge process accomplish to copy completely, at the place, trouble spot the single step of releasing electroacoustic appears at regular intervals namely, with discharge spark, because discharge is a kind of pulsed discharge, the voltage on the capacitor C will descend simultaneously, the insulation of ball discharge gap Q is recovered, and discharge process finishes; This moment, adjustable high voltage D. C E began again the charging to capacitor C, and behind the process certain hour, when the voltage on the capacitor C reached the sparking voltage of ball discharge gap Q again, discharge occured again, so repeatedly carries out.
The voltage U of capacitor C is the function of time t, be voltage U in time t variation and change, close a floodgate moment as zero-time take K switch, voltage U is pressed index law from zero in time t and is risen, through behind the certain hour, when the voltage U on the capacitor C rises to the voltage breakdown of ball discharge gap Q, ball discharge gap Q discharge, the electric energy that is stored in capacitor C discharges to the trouble spot by ball discharge gap Q, the place produces acoustooptic effect in the trouble spot, we just can find the position of trouble spot easily according to acousto-optic, moreover we the design this circuit, what realize is automatic, has the certain hour interval, continuous discharge, make discharge process accomplish to copy completely, its external manifestation is exactly the single step of releasing electroacoustic to occur at regular intervals at the place, trouble spot, simultaneously with discharge spark, because after discharge occurs, it is a kind of pulsed discharge, voltage on the capacitor C will descend, the insulation of ball discharge gap Q is recovered, discharge process finishes, this moment, adjustable high voltage D. C E began again to charge to capacitor C, behind the process certain hour, when the voltage on this capacitor C reaches the sparking voltage of ball discharge gap Q again, discharge has occured again, so repeatedly carries out.It is worthy of note, in order to produce larger discharge spark and discharge current steepness in the trouble spot, in our resistance in series not of capacitor C discharge loop.
Beneficial effect of the present invention: the circuit of the present invention's design has been realized a kind of continuous discharge that has automatically the certain hour interval, make the trouble spot discharge process accomplish to copy completely, characteristics with practicality, rapidity and accuracy can accurately be located the insulation of electrical installation fault.
Description of drawings
Fig. 1 is the circuit of searching the insulation of electrical installation fault.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, a kind of circuit of fast finding insulation of electrical installation fault, it comprises adjustable high voltage D. C E, the positive output end of adjustable high voltage D. C E is connected with an end of resistance R by K switch, the end of the other end of resistance R and capacitor C, the other end of resistance R is connected the negative output terminal ground connection of fault winding, capacitor C and adjustable high voltage D. C E with the tie point of capacitor C one end with the fault winding by ball discharge gap Q.
In September, 2009, the normal generation stator grounding accident in service of 660MW generator of certain factory, normally in service, generator stator ground protection action, generator contactor tripping operation, generator and system sectionalizing; Use the 2500V megohmmeter, measure respectively generator unit stator winding three-phase insulation resistance over the ground and be: A phase 460M Ω, B phase 820M Ω, C phase 0M Ω can find out that from insulation resistance earth fault has occured generator unit stator winding C mutually.The testing transformer process half-wave rectification that we select a voltage is 20KV, rated capacity 5KVA is not as adjustable high voltage D. C (generally adopting the electronic high-voltage dc generator), 5KVA from the lotus root pressure regulator as voltage adjusting device, capacitor is the capacitor of electric capacity 0.02 F, rated voltage 15KV, adjustable resistance is transferred to 1000 Ω, Fig. 1 wiring is slightly changed, be the direct ground connection of terminal that the ball discharge gap meets trouble spot Cx, the sparking voltage of adjusting the ball discharge gap is 5KV.We are principle of work for convenience of description, has just introduced the concept of K switch, is unwanted in the real work, the rise of starting from scratch of adjustable high voltage D. C voltage.Wiring according to Fig. 1, adjust the pressure regulator of testing transformer input side, the testing transformer that raises gradually output is through the adjustable high-voltage dc voltage of overcommutation, when adjustable high voltage D. C voltage is elevated to the sparking voltage (5KV) in ball discharge gap, the ball discharge gap discharge, the electric energy that is stored in capacitor discharges by the trouble spot, produce the discharge arc light in the trouble spot, simultaneously with discharge sound, the staff who enters the generator end by generator end manhole door, very easily observed the position of trouble spot, be positioned at No. 18 groove top bars and encourage near the side channel mouth.
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (5)
1. the circuit of a fast finding insulation of electrical installation fault, it is characterized in that, it comprises adjustable high voltage D. C E, the positive output end of adjustable high voltage D. C E is connected with an end of resistance R by K switch, the end of the other end of resistance R and capacitor C, the other end of resistance R is connected the negative output terminal ground connection of fault winding, capacitor C and adjustable high voltage D. C E with the tie point of capacitor C one end with the fault winding by ball discharge gap Q.
2. a kind of circuit of fast finding insulation of electrical installation fault as claimed in claim 1 is characterized in that the disruptive discharge voltage of described ball discharge gap Q is a little more than the disruptive discharge voltage of trouble spot.
3. based on the method for a kind of fast finding insulation of electrical installation of circuit fault of a kind of fast finding insulation of electrical installation fault claimed in claim 1, it is characterized in that concrete steps are:
The first step: regulate the sparking voltage of ball discharge gap Q, make the disruptive discharge voltage of ball discharge gap Q a little more than the disruptive discharge voltage of trouble spot;
Second step: the circuit that connects fast finding insulation of electrical installation fault;
The 3rd step: the K that closes a switch, adjustable high voltage D. C E, resistance R, capacitor C form charge circuit, and adjustable high voltage D. C E is to capacitor C charging, and capacitor C voltage U is pressed the index law rising from zero with t in time;
The 4th step: when the voltage U on the capacitor C rises to the disruptive discharge voltage of ball discharge gap Q, ball discharge gap Q begins discharge, the electric energy that is stored in capacitor C discharges to the trouble spot by ball discharge gap Q, the place, trouble spot produces acoustooptic effect, according to the acoustooptic effect that the trouble spot produces, will find the position of trouble spot.
4. the method for a kind of fast finding insulation of electrical installation fault as claimed in claim 3 is characterized in that, the voltage U at the described capacitor C two ends in time variation relation of t is:
U=E[1-exp(-t/τ)]
Wherein, E is adjustable high voltage D. C voltage, and exp=2,718 is constant, and τ=RC is time constant, and t is the time.
5. the method for a kind of fast finding insulation of electrical installation fault as claimed in claim 3, it is characterized in that, in the described step 4, when the capacitor discharge process finishes, adjustable high voltage D. C begins again to capacitor charging, through behind the certain hour, when the voltage on the capacitor C reaches the disruptive discharge voltage in ball discharge gap again, discharge occurs again, so repeatedly carries out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210377496.5A CN102879719B (en) | 2012-09-29 | 2012-09-29 | Method and circuit for quickly searching insulation faults of electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210377496.5A CN102879719B (en) | 2012-09-29 | 2012-09-29 | Method and circuit for quickly searching insulation faults of electrical equipment |
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| CN102879719A true CN102879719A (en) | 2013-01-16 |
| CN102879719B CN102879719B (en) | 2015-07-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049184A (en) * | 2014-04-18 | 2014-09-17 | 清华大学 | Device for detecting strength characteristic of dynamic dielectric of contact gap of breaker |
| CN105277845A (en) * | 2015-09-24 | 2016-01-27 | 武汉三新电力设备制造有限公司 | Generator stator winding earth fault exact location instrument |
| CN115825660A (en) * | 2022-11-21 | 2023-03-21 | 白银有色动力有限公司 | Method for searching common-box enclosed bus sleeve fault by discharge flashover of high-voltage capacitor |
| CN116087714A (en) * | 2023-01-15 | 2023-05-09 | 西安热工研究院有限公司 | Method for quickly searching insulation fault points of electrical equipment |
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| US20070041140A1 (en) * | 2005-08-17 | 2007-02-22 | Kimihiko Furukawa | Method to determine current detection circuit failure |
| CN101662206A (en) * | 2009-09-23 | 2010-03-03 | 上海导向微电子有限公司 | Soft start circuit, method and switch power supply circuit |
| CN102207533A (en) * | 2011-04-12 | 2011-10-05 | 陕西化建工程有限责任公司 | Method for searching fault of power cable |
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| CN203069736U (en) * | 2012-09-29 | 2013-07-17 | 大唐黄岛发电有限责任公司 | Circuit for quickly finding out insulation faults of electrical equipment |
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2012
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| US20070041140A1 (en) * | 2005-08-17 | 2007-02-22 | Kimihiko Furukawa | Method to determine current detection circuit failure |
| CN101662206A (en) * | 2009-09-23 | 2010-03-03 | 上海导向微电子有限公司 | Soft start circuit, method and switch power supply circuit |
| CN102207533A (en) * | 2011-04-12 | 2011-10-05 | 陕西化建工程有限责任公司 | Method for searching fault of power cable |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049184A (en) * | 2014-04-18 | 2014-09-17 | 清华大学 | Device for detecting strength characteristic of dynamic dielectric of contact gap of breaker |
| CN104049184B (en) * | 2014-04-18 | 2017-01-04 | 清华大学 | A kind of detection device of contact of breaker gap dynamic media strength characteristics |
| CN105277845A (en) * | 2015-09-24 | 2016-01-27 | 武汉三新电力设备制造有限公司 | Generator stator winding earth fault exact location instrument |
| CN115825660A (en) * | 2022-11-21 | 2023-03-21 | 白银有色动力有限公司 | Method for searching common-box enclosed bus sleeve fault by discharge flashover of high-voltage capacitor |
| CN116087714A (en) * | 2023-01-15 | 2023-05-09 | 西安热工研究院有限公司 | Method for quickly searching insulation fault points of electrical equipment |
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| CN102879719B (en) | 2015-07-15 |
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