CN2169861Y - Electric positioner for transformer local discharging - Google Patents
Electric positioner for transformer local discharging Download PDFInfo
- Publication number
- CN2169861Y CN2169861Y CN 93221150 CN93221150U CN2169861Y CN 2169861 Y CN2169861 Y CN 2169861Y CN 93221150 CN93221150 CN 93221150 CN 93221150 U CN93221150 U CN 93221150U CN 2169861 Y CN2169861 Y CN 2169861Y
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- CN
- China
- Prior art keywords
- amplifier
- sensor
- transformer
- digital recorder
- transient state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a measuring device for judging the local discharge position of a power transformer. The utility model is composed of a sensor 3, a sensor 4, an amplifier 5, a transient digital recorder 6, a printer 7 and a displayer 8. When the local discharge of the device occurs according to the winding of the transformer, the position relation of the local discharge signal sent towards both ends by using a discharge point as the center and the discharge point can determine the position of the discharge point. The device has high positioning accuracy for the discharge point. The utility model can effectively eliminate the influence from the external interference and has convenient use. The utility model can conduct the automatic process for the measured result, so that the utility model can ensure accurate and quick position. Simultaneously, the utility model is also suitable for the local discharge position of other electric equipment, such as a reactor, etc.
Description
The utility model relates to a kind of measurement mechanism that is used to judge the Partial Discharge in Power Transformer position.
Power transformer is the major equipment in the electric system, and their fault will influence the power supply continuity of electric system, and the safe operation and the national economy of system is all had significant impact.The power transformer fault statistics be the analysis showed that the accident that transformer coil and lead wire insulation cause accounts for the inferior 70%-80% of total casual clearing station both at home and abroad.And judge the important criterion of transformer insulated situation, be exactly the size of partial discharge of transformer amount.Surpass the state specified standards value as discharge capacity, will seek the location to the discharge position, so that repair as early as possible, the localization by ultrasonic device is adopted in the partial discharge of transformer location more at present.But localization by ultrasonic because decay is too big in the ultrasonic propagation process, can only be searched the fault by the outside winding of fuel tank, and is to the internal layer winding, particularly near the winding failure of core side, almost reactionless.The brainstrust of our times various countries also is devoted to the research of electrical Location method and device, but so far important breakthrough is not arranged as yet except the research ultrasonic locatization.
The purpose of this utility model provides a cover can convenient, accurately judge the partial discharge of transformer position, and is fit to the on-the-spot shelf depreciation electrical Location device that uses.
The utility model is realized as follows: form whole device by sensor, amplifier, transient state digital recorder, printer, display.Sensor is installed in the head end and the end of Transformer Winding, and the signal pairing of head and end is input to amplifier.Amplifier is made up of three groups of identical two-way amplifiers of performance, and frequency range is 10KHZ-400KHZ.Sensor is connected with concentric cable with amplifier.The transient state digital recorder is 6 passages, has pre-triggering system, has 5-20 doubly to amplify to signal.The input end of transient state digital recorder links to each other with amplifier, and output terminal links to each other with printer, display.See accompanying drawing 1.
The sensor iron core is made by soft magnetic ferrites, is shaped as perfect square shape or domain shape, also can be by two en shapes or two semi-circular connecting and composing, and core section is 300-1000mm
2Be wound with coil on the iron core, coil turn is the 20-100 circle, is parallel with resistance on the coil, and its resistance is 200-1000 Ω.
The two-way amplifier is made up of two-way amplification filtering system and differential amplification system.Two-way amplification filtering system comprises many grades of input attenuators of two-way, and field effect transistor and operational amplifier and resistance capacitance element constitute.Differential amplifier section is made up of two groups of operational amplifiers, and the signal of being exported by voltage follower outputs to the transient state digital recorder behind diode detection.See accompanying drawing 2.
Each passage A/D buffer area of transient state digital recorder is 64KB, and sampling rate is that 1.25-20MHZ/S is adjustable.
Principle of work of the present utility model is that according to Fundamental Theory of Electrical Engineering, the distribution parameter chain loop circuit representation of inductance, electric capacity and resistance composition can be used in the equivalent loop of transformer.But in a certain high band, the equivalent circuit of transformer can replace with pure electric capacity recurrent circuit approx, and this has just simplified circuit, convenient calculating.During shelf depreciation point in determining Transformer Winding, just can to the local discharge signal of two ends transmission and the numerical relation of spark location, adopt above-mentioned pure electric capacity chain equivalent circuit by being the center with the point of discharge, calculate according to Fundamental Theory of Electrical Engineering, can determine the position of point of discharge.During actual measurement, sensor is installed in the head end (utilizing the tapping of bushing usually) of tested each winding of phase of transformer, terminal (can be the tapping of neutral point or neutral bushing), then at the low pressure winding making alive of transformer, when shelf depreciation takes place in tested winding somewhere, the head and end transmission of response current signal to winding then arranged, sensor with this a pair of signals collecting after, amplify by the two-way amplifier, filtering, input to the transient state digital recorder, program according to establishment is carried out data processing, by printer, display is printed and is demonstrated partial discharge position.
The utility model has the advantages that accurate positioning adopts this covering device that partial discharge of transformer point location actual measurement is shown, positional accuracy the winding electrical length 8% in.Eliminate the influence of external disturbance theoretically.Transformer is inner to produce the signal that shelf depreciation must form head and end, and this signal is corresponding a pair of waveform, and every azygous waveform is interference waveform, is not counted in when data processing.This device is easy to use, and measurement result is handled automatically, has saved a large amount of hand computation times, has guaranteed that accurately reaching of location is quick.This device also is applicable to the shelf depreciation location survey of other electrical equipments such as reactor.
Accompanying drawing 1, key wiring diagram of the present utility model
Wherein: the tapping of the tested winding 2-of 1-transformer bushing
3-head end sensor 4-tip sensor
5-two-way amplifier 6-transient state digital recorder
7-printer 8-display
Accompanying drawing 2, the utility model two-way amplifier schematic diagram
The utility model is implemented as follows.The sensor iron core adopts soft magnetic ferrites, is shaped as perfect square shape or domain shape, and also two en shapes or two semi-circular linking to each other are connected into, and core section is 300-1000mm
2Be wound with coil on the iron core, coil turn is the 20-100 circle, and parallel resistance on the coil, its resistance are 200-1000 Ω.Coil is poured into a mould with insullac, and two ends cause the two-way amplifier by concentric cable.Each is made of common transformer low pressure, middle pressure, three windings of high pressure, so need form amplifier unit by three groups of identical two-way amplifiers of performance.The signal pairing of each winding head and end is input in the two-way amplifier.The two-way amplifier has two-way amplification filtering and differential amplification two parts.Wherein two-way amplification filtering system is by the dual input attenuator, and attenuation multiple is 1,5,10,100,1,000 five grades, amplifies fine setting and adopts multi-circle wirewound potentiator, and signal is through field effect transistor (3DJ6F), to operational amplifier (LF356).According to experimental enviroment and disturbed condition, by output I and output II (Fig. 2) directly signal is delivered to the transient state digital recorder or with signal after differential amplification (LF353), by voltage follower (LF353) output signal, after diode (GENERAL TYPE) detection, deliver to the transient state digital recorder.The transient state digital recorder can be bought stock, and its main technical detail is, 6 passages, and each passage A/D buffer area is 64KB, sampling rate is that 1.25-20MHZ/S is adjustable.The transient state digital recorder is 5-20 times to the enlargement factor of signal.Pre-triggering system is arranged.Display and printer are universal.Local discharge signal can show the relation curve that prints discharge count and discharge position and find discharge position thus after the transient state digital recorder is carried out data processing.
Claims (5)
1, a kind of partial discharge of transformer electrical Location device, it is characterized in that by sensor, amplifier, the transient state digital recorder, printer, display is formed, sensor is installed in the head end and the end of Transformer Winding, the signal pairing of head and end is input to amplifier, amplifier is made up of three groups of identical two-way amplifiers of performance, its frequency range is 10KHZ-400KHZ, sensor is connected with concentric cable with amplifier, the transient state digital recorder is 6 passages, has pre-triggering system, have 5-20 doubly to amplify to signal, the input end of transient state digital recorder links to each other with amplifier, output terminal and printer, display links to each other.
2, partial discharge of transformer electrical Location device as claimed in claim 1, the iron core that it is characterized in that sensor is made by soft magnetic ferrites, be shaped as perfect square shape or domain shape, also can be by two en shapes or two semi-circular connecting and composing, core section is 300mm
2-1000mm
2
3, partial discharge of transformer electrical Location device as claimed in claim 1 is characterized in that being wound with coil on the iron core of sensor, and coil turn is 20 circles-100 circles, is parallel with resistance on the coil, and its resistance is 200 Ω-1000 Ω.
4, partial discharge of transformer electrical Location device as claimed in claim 1, it is characterized in that the two-way amplifier is made up of amplification filtering system and differential amplification system, two-way amplification filtering system comprises the high-grade input attenuator of two-way, field effect transistor and operational amplifier and resistance capacitance element constitute, differential amplification system is made up of two groups of operational amplifiers, and the signal of voltage follow output outputs to the transient state digital recorder behind diode detection.
5, partial discharge of transformer electrical Location device as claimed in claim 1 is characterized in that each passage A/D buffer area of transient state digital recorder is 64KB, and sampling rate is that 1.25MHZ/S-20MHZ/S is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93221150 CN2169861Y (en) | 1993-08-10 | 1993-08-10 | Electric positioner for transformer local discharging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93221150 CN2169861Y (en) | 1993-08-10 | 1993-08-10 | Electric positioner for transformer local discharging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2169861Y true CN2169861Y (en) | 1994-06-22 |
Family
ID=33800078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93221150 Expired - Fee Related CN2169861Y (en) | 1993-08-10 | 1993-08-10 | Electric positioner for transformer local discharging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2169861Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1777814B (en) * | 2003-05-09 | 2010-06-23 | 西门子公司 | Measuring device, and method for locating a partial discharge |
| CN103389446A (en) * | 2013-07-26 | 2013-11-13 | 武汉利捷电子技术有限责任公司 | Electrical positioning method for partial discharge of power transformer |
| CN107728023A (en) * | 2017-10-27 | 2018-02-23 | 苏州华电电气股份有限公司 | Involvement formula series resonance inductor partial pressure Transmission System for High Voltage Measurements |
-
1993
- 1993-08-10 CN CN 93221150 patent/CN2169861Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1777814B (en) * | 2003-05-09 | 2010-06-23 | 西门子公司 | Measuring device, and method for locating a partial discharge |
| CN103389446A (en) * | 2013-07-26 | 2013-11-13 | 武汉利捷电子技术有限责任公司 | Electrical positioning method for partial discharge of power transformer |
| CN103389446B (en) * | 2013-07-26 | 2015-05-13 | 武汉利捷电子技术有限责任公司 | Electrical positioning method for partial discharge of power transformer |
| CN107728023A (en) * | 2017-10-27 | 2018-02-23 | 苏州华电电气股份有限公司 | Involvement formula series resonance inductor partial pressure Transmission System for High Voltage Measurements |
| CN107728023B (en) * | 2017-10-27 | 2024-04-02 | 苏州华电电气股份有限公司 | Pressure measuring system for partial pressure of integrated series resonance inductance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |