CN2195763Y - Antijamming local electric discharge detecting instrument - Google Patents
Antijamming local electric discharge detecting instrument Download PDFInfo
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- CN2195763Y CN2195763Y CN 93244842 CN93244842U CN2195763Y CN 2195763 Y CN2195763 Y CN 2195763Y CN 93244842 CN93244842 CN 93244842 CN 93244842 U CN93244842 U CN 93244842U CN 2195763 Y CN2195763 Y CN 2195763Y
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Abstract
The utility model discloses an anti-jamming local electric discharge detecting instrument. The utility model is suitable for detecting the inner insulating local electric discharge signal of the high-voltage electric equipment in the jamming environment. The utility model is composed of two preamplifiers, a differential balance detecting circuit DF, a frequency selection filter, and an electric discharge indicator, wherein, the input terminals of two preamplifiers are respectively a wire connecting terminal a and a wire connecting terminal b, the output terminals of two preamplifiers are respectively and correspondingly connected with two input terminals of the differential balance detecting circuit DF, the output terminal of the differential balance detecting circuit DF is connected with the input terminal of the frequency selection filter, and the output terminal of the frequency selection filter is connected with the electric discharge indicator. The utility model solves the shortages that the existing anti-jamming local electric discharge detecting instrument is large in size, large in weight, inconvenient in use at site. The utility model has the characteristics of strong anti-jamming ability and high detecting sensitivity.
Description
The utility model discloses a kind of anti-interference local discharge detector, be applicable in interference environment, detect the inner local discharge signal of high voltage electric equipment insulation.
The Partial discharge detector of domestic production at present, great majority do not possess the function that bridge-type (balance) detects, and external production, the Partial discharge detector that has bridge detection circuit, as: products such as Tettex Instruments's 9124 type bridge-type detectors, what adopted also all is principle of work of similar Schering bridge, its bridge circuit is by two independent balances, and the detection impedance that links to each other with the ground wire of capacitor Ck and Cl is formed, (dashed rectangle is depicted as bridge-type and detects the loop among the figure) as shown in Figure 1, its course of work is: be connected on the pontic by variable resistor Ga by adjusting, the two-way that Gb and variable capacitance C form detects impedance, it is identical with Ub to make the external disturbance electric current detect the voltage drop Ua that produces in the impedance at this two-way, and promptly this bridge type return has reached the optimum balance state.At this moment, when " outside " undesired signal produces, can on two branch roads, produce " electric current I that pattern is identical ", these electric currents can cause identical voltage drop Ua and Ub, ideally, should be zero at the output terminal potential difference (PD) Ua-b of bridge circuit, undesired signal is offset accordingly.And test product generation shelf depreciation produces loop current i(t), it is just in time opposite to detect the voltage drop Ua and the Ub polarity that form in the impedance at two, and potential difference (PD) Ua-b then can be detected also by instrument can obtain reading.
Yet, because the regulating element (Ga, Gb and C) of this class bridge circuit is connected in the high-voltage test loop, during operating instrument, it is the parameter of directly regulating the test loop, this just requires Ga and Gb to possess the ability of bearing than high current load (power dissipation), certainly will cause the detector volume to increase, weight increases, and brings many inconvenience for on-the-spot the use.
The purpose of this utility model provides a kind of novel anti-interference local discharge detector, and it has, and volume is little, in light weight, and antijamming capability is strong, the detection sensitivity height, and adaptability is strong, on-the-spot characteristics easy to use.
The purpose of this utility model is achieved in that a kind of anti-interference local discharge detector, it is made up of two prime amplifiers, a differential balance testing circuit DF, a frequency-selecting filter and a discharge indicator, wherein, the input end of two prime amplifiers is respectively connection terminal a and b; The output terminal of two prime amplifiers is corresponding respectively to be connected on two input ports of differential balance testing circuit DF, and the output terminal selecting of differential balance testing circuit DF is the input end of wave filter frequently, and the output terminal C of frequency-selecting filter connects discharge indicator.
The utility model has the advantages that: because instrument has adopted a kind of novel differential balance detection technique, processing mode is absolutely different with the Schering bridge principle, it does not directly regulate the parameter of test loop, two detected voltage signals of universal detection impedance that only are docked in the bridge type return are handled, so can adopt the microelectronics treatment technology, adopt some conventional measurement of partial discharge technology again, just can reach the inhibition external interference, detect local discharge signal with sensitivity, can be by the difference of test specimen, select dissimilar detection impedances for use, adaptability is strong, and it is little to have a volume, in light weight, on-the-spot characteristics easy to use.
Fig. 1 is XiLin bridge-type detector principle schematic;
External connection synoptic diagram when Fig. 2 is the utility model functional-block diagram and detection;
Fig. 3 is a differential balance testing circuit element wiring schematic diagram in the utility model;
Fig. 4 is the utility model panel synoptic diagram;
Dashed rectangle is depicted as differential balance testing circuit DF synoptic diagram among Fig. 2.
Below in conjunction with accompanying drawing the utility model is done further argumentation in detail:
The utility model is not only for described embodiment.
Embodiment 1:
The anti-interference local discharge detector is by two prime amplifiers 11,12, a differential balance testing circuit DF, a frequency-selecting filter 5 and a discharge indicator, (as: being used to observe the oscillograph 6 of discharge waveform, conventional Partial discharge detector etc.) formed; Differential balance testing circuit DF is made up of two amplitude regulating elements 21,22, two phase adjusted elements 31,32, a differential amplifier 4.
Wherein, the input end of prime amplifier 11,12 is connection terminal a and b; The corresponding respectively input end that is connected on amplitude regulating element 21,22 of the output terminal of prime amplifier 11,12, the output terminal of amplitude regulating element 21,22 is corresponding respectively to be connected on the input end of phase adjusted element 31,32, the output terminal of phase adjusted element 31,32 is corresponding respectively to be connected on two input ends of differential amplifier, the output terminal selecting of differential amplifier 4 is the input end of wave filter 5 frequently, and the output terminal C of frequency-selecting filter 5 connects oscillograph 6.
The amplitude regulating element is made up of band indication multiturn potentiometer VR1 and in-phase amplifier, wherein, in-phase amplifier is made up of ultra-low noise high precision operating amplifier A1 and stake resistance R1, feedback resistance R2, two stiff ends of band indication multiturn potentiometer VR1 are connected between the output terminal and signal ground of prime amplifier, the adjustable side is connected on the input end of in-phase amplifier, the input end of the output termination phase adjusted element of in-phase amplifier.
The adjusting termination of two band indication multiturn potentiometer VR1, the amplitude that connects respectively on the instrument panel is regulated button VR11, VR12.
The amplitude regulating element also can be realized with the in-phase amplifier or the inverting amplifier of a Gain Adjustable.
The phase adjusted element is by a variable resistor VR2, a capacitor C, two resistance R 3, R4 and a ultra-low noise high precision operating amplifier A2 form, resistance R 3 in the element is connected across between the inverting input of the output terminal of amplitude regulating element and ultra-low noise high precision operating amplifier A2, capacitor C is connected across between the in-phase input end of the output terminal of amplitude regulating element and ultra-low noise high precision operating amplifier A2, the variable resistor VR2 of band indication is connected between the in-phase input end and signal ground of ultra-low noise high precision operating amplifier A2, and feedback resistance R4 is connected across between the output terminal and inverting input of ultra-low noise high precision operating amplifier A2.
The adjusting termination of the variable resistor VR2 of two band indications meets the phase adjusted button VR21 on the instrument panel respectively, VR22.
Capacitor C and potentiometer VR2 wiring position exchange, and also can realize phase modulation function.
Differential amplifier 4 is made up of with four identical resistance R 5, R6, R7, R8 of resistance the operational amplifier A 3 of high cmrr, the inverting input of one termination operational amplifier A 3 of resistance R 5, the other end is connected on the output terminal of a phase adjusted element 31, R6 is connected across between the output terminal and inverting input of operational amplifier A 3, the in-phase input end of one termination operational amplifier A 3 of resistance R 7, the other end is connected on the output terminal of another phase adjusted element 32, and resistance R 8 is connected across between the in-phase input end and signal ground of operational amplifier A 3.
Differential amplifier is the conventional differential amplifier of other form also.
The course of work of this instrument is:
Two the terminal a and the b of detector are connected on the detection impedance Z m1 that is used to detect partial discharge pulse's current signal, the output terminal of Zm2 respectively, and the input end of Zm1, Zm2 are concatenated into respectively on the ground wire of test product Ct in the balance test loop and coupling capacitance or discharge off test product Ck.
If interference current 11 and 12 detects weak voltage signal Ua and the Ub that produces in the impedance at two, after the instrument prime amplifier amplifies after testing, regulate button VR11 by the amplitude on the instrument panel, VR12 and phase adjusted button VR21, VR22, regulate the amplitude and the phase place of these two voltage signals respectively, then the signal after these two adjustings being carried out difference amplifies, and its result is sent into frequency-selecting filter 5 carry out Filtering Processing, device by can observing discharge waveform such as oscillograph 6 or peak value meter are measured at last.
In the ideal case, establish frequency-selecting filter and have the passband that is rather narrow, amplifier does not produce noise, to two voltage signals with random waveform of being imported, by regulating amplitude and phase place, it is cancelled out each other, and promptly the output voltage of wave filter is zero.
Because it is identical that external interference current 11 and 12 detects the voltage signal polarity that produces in the impedance at two, and shelf depreciation when taking place in test product Ct, it is opposite that the loop current that is produced detects the voltage signal polarity that produces in the impedance at two, so when the amplitude of regulating on the instrument panel is regulated button VR11, VR12 and phase adjusted button VR21, after VR22 cancels out each other the detected external interference signal of detector, can not cause the counteracting of the local discharge signal in the test product, by conventional measurement of partial discharge means such as oscillograph 6 or peak value meters, can detect discharge signal and characteristic parameter thereof.
The detection frequency band of detector is controlled by FB, during use, should select to disturb less detection frequency band according to the disturbed condition of measure field.The size of detector output signal is controlled by gain-adjusted AV.
Claims (4)
1, a kind of anti-interference local discharge detector, it is characterized in that: it is by two prime amplifiers (11), (12), differential balance testing circuit DF, a frequency-selecting filter (5) and a discharge indicator (6) are formed, wherein, the input end of prime amplifier (11), (12) is connection terminal a and b; The output terminal of prime amplifier (11), (12) is corresponding respectively to be connected on two input ports of differential balance testing circuit DF, the output terminal selecting of differential balance testing circuit DF is the input end of wave filter (5) frequently, and the output terminal C of frequency-selecting filter (5) connects discharge indicator (6).
2, a kind of anti-interference local discharge detector as claimed in claim 1, it is characterized in that: differential balance testing circuit DF is by two amplitude regulating elements (21), (22), two phase adjusted elements (31), (32), a differential amplifier (4) are formed; Wherein, the input end of two amplitude regulating elements (21), (22) connects the output terminal of prime amplifier (11), (12) respectively, the output terminal of two amplitude regulating elements (21), (22) correspondence respectively is connected on the input end of phase adjusted element (31), (32), the output terminal of phase adjusted element (31), (32) correspondence respectively is connected on two input ends of differential amplifier (4), and the output terminal selecting of differential amplifier (4) is the input end of wave filter (5) frequently.
3, a kind of anti-interference local discharge detector as claimed in claim 2 is characterized in that: amplitude regulating element (21), (22) all are made up of a potentiometer VR1 and an in-phase amplifier; Phase adjusted element (31), (32) all be by a variable resistor VR2, a capacitor C, two resistance R 3, R4 and an operational amplifier A 2 are formed, wherein, two stiff ends of potentiometer VR1 in the amplitude regulating element are connected between the output terminal and signal ground of prime amplifier, the adjustable side is connected on the input end of in-phase amplifier, the input end of the output termination phase adjusted element of in-phase amplifier; Resistance R 3 in the phase adjusted element is connected across between the inverting input of the output terminal of amplitude regulating element and operational amplifier A 2, capacitor C is connected across between the in-phase input end of the output terminal of amplitude regulating element and operational amplifier A 2, variable resistor VR2 is connected between the in-phase input end and signal ground of operational amplifier A 2, and feedback resistance R4 is connected across between the output terminal and inverting input of operational amplifier A 2.
4, as claim 2 or 3 described a kind of anti-interference local discharge detectors, it is characterized in that: differential amplifier (4) is the operational amplifier A 3 and four resistance R 5 that resistance is identical by high cmrr, R6, R7, R8 forms, the inverting input of one termination operational amplifier A 3 of resistance R 5, the other end is connected on the output terminal of a phase adjusted element (31), resistance R 6 is connected across between the output terminal and inverting input of operational amplifier A 3, the in-phase input end of one termination operational amplifier A 3 of resistance R 7, the other end is connected on the output terminal of another phase adjusted element (32), and resistance R 8 is connected across between the in-phase input end and signal ground of operational amplifier A 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93244842 CN2195763Y (en) | 1993-11-20 | 1993-11-20 | Antijamming local electric discharge detecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93244842 CN2195763Y (en) | 1993-11-20 | 1993-11-20 | Antijamming local electric discharge detecting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2195763Y true CN2195763Y (en) | 1995-04-26 |
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ID=33817963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93244842 Expired - Fee Related CN2195763Y (en) | 1993-11-20 | 1993-11-20 | Antijamming local electric discharge detecting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2195763Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202425B (en) * | 2006-12-04 | 2011-02-02 | 株式会社东芝 | Partial discharge detector |
| CN101622546B (en) * | 2007-03-06 | 2012-07-18 | 日本电气株式会社 | Impulse immunity evaluating device |
| CN102790589A (en) * | 2012-08-27 | 2012-11-21 | 上海市计量测试技术研究院 | Amplifier for measuring 1MHz common mode rejection ratios of high-resistance high-voltage differential probe |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN107167717A (en) * | 2017-07-20 | 2017-09-15 | 云南电网有限责任公司电力科学研究院 | A kind of local discharge signal blocking device |
| CN113219285A (en) * | 2021-05-12 | 2021-08-06 | 山东航宇吉力电子有限公司 | General inspection tester of aircraft |
-
1993
- 1993-11-20 CN CN 93244842 patent/CN2195763Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202425B (en) * | 2006-12-04 | 2011-02-02 | 株式会社东芝 | Partial discharge detector |
| CN101622546B (en) * | 2007-03-06 | 2012-07-18 | 日本电气株式会社 | Impulse immunity evaluating device |
| CN102790589A (en) * | 2012-08-27 | 2012-11-21 | 上海市计量测试技术研究院 | Amplifier for measuring 1MHz common mode rejection ratios of high-resistance high-voltage differential probe |
| CN102790589B (en) * | 2012-08-27 | 2015-04-29 | 上海市计量测试技术研究院 | Amplifier for measuring 1MHz common mode rejection ratios of high-resistance high-voltage differential probe |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN107167717A (en) * | 2017-07-20 | 2017-09-15 | 云南电网有限责任公司电力科学研究院 | A kind of local discharge signal blocking device |
| CN107167717B (en) * | 2017-07-20 | 2024-02-06 | 云南电网有限责任公司电力科学研究院 | Partial discharge signal blocking device |
| CN113219285A (en) * | 2021-05-12 | 2021-08-06 | 山东航宇吉力电子有限公司 | General inspection tester of aircraft |
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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 |