CN204166091U - Device for detecting partial discharge signal - Google Patents
Device for detecting partial discharge signal Download PDFInfo
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- CN204166091U CN204166091U CN201420622508.0U CN201420622508U CN204166091U CN 204166091 U CN204166091 U CN 204166091U CN 201420622508 U CN201420622508 U CN 201420622508U CN 204166091 U CN204166091 U CN 204166091U
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- partial discharge
- detecting partial
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- 230000036961 partial effect Effects 0.000 title claims abstract description 45
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The utility model discloses a kind of device for detecting partial discharge signal, comprise outer sensor, filtering circuit, linear amplifier circuit and envelope detected circuit, described outer sensor is connected with described filtering circuit, the local discharge signal of detection is sent to described filtering circuit, described filtering circuit is connected with described linear amplifier circuit, filtered described local discharge signal is sent to described linear amplifier circuit, described linear amplifier circuit is connected with described envelope detected circuit, local discharge signal after Linear Amplifer is sent to described envelope detected circuit and carries out envelope detected.Implement the utility model, effectively can suppress mobile phone signal, improve anti-interference, also can retain shelf depreciation information important in a large number, reduce the sample frequency that Back end data gathers, effectively discharge bus bandwidth, reduce system power dissipation.
Description
Technical field
The utility model relates to signal processing technology field, particularly relates to a kind of device for detecting partial discharge signal.
Background technology
Widespread use ultrahigh frequency method in electric system Partial Discharge Detection, the frequency range mainly utilizing the electric discharge of special antenna local to produce, at the electromagnetic wave of 300MHz ~ 1.5GHz, carries out subsequent treatment by low noise amplifier to signal amplification again after high speed analog-to-digital conversion.
But above-mentioned ultrahigh frequency method adopts bandpass filter to play a game to put discharge signal and processes, and does not suppress phone undesired signal, causes the accuracy of detection of local discharge signal to reduce.
Utility model content
Based on this, be necessary, for the high-frequency method in above-mentioned Partial Discharge Detection, not suppress phone undesired signal, the problem easily causing the accuracy of detection of local discharge signal to reduce, provides a kind of device for detecting partial discharge signal.
A kind of device for detecting partial discharge signal, comprise outer sensor, filtering circuit, linear amplifier circuit and envelope detected circuit, described outer sensor is connected with described filtering circuit, the local discharge signal of detection is sent to described filtering circuit, described filtering circuit is connected with described linear amplifier circuit, filtered described local discharge signal is sent to described linear amplifier circuit, described linear amplifier circuit is connected with described envelope detected circuit, the local discharge signal after Linear Amplifer is sent to described envelope detected circuit and carries out envelope detected.
Above-mentioned device for detecting partial discharge signal, comprise outer sensor, filtering circuit, linear amplifier circuit and envelope detected circuit, effectively can be suppressed mobile phone signal by filtering circuit, improve anti-interference, shelf depreciation information important in a large number in local discharge signal can be retained by envelope detected circuit, the sample frequency that Back end data gathers can be reduced again, effectively discharge bus bandwidth, reduce system power dissipation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model device for detecting partial discharge signal first embodiment;
Fig. 2 is the structural representation of the utility model device for detecting partial discharge signal second embodiment;
Fig. 3 is the structural representation of the utility model device for detecting partial discharge signal the 3rd embodiment;
Fig. 4 is the structural representation of the utility model device for detecting partial discharge signal the 4th embodiment;
Fig. 5 is the structural representation of the utility model device for detecting partial discharge signal the 5th embodiment;
Fig. 6 is the structural representation of the utility model device for detecting partial discharge signal the 6th embodiment;
Fig. 7 is the structural representation of the utility model device for detecting partial discharge signal the 7th embodiment;
Fig. 8 is the structural representation of the utility model device for detecting partial discharge signal the 8th embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, Fig. 1 is the structural representation of device for detecting partial discharge signal first embodiment of the present utility model.
The described device for detecting partial discharge signal of present embodiment can comprise the outer sensor 100 connected successively, filtering circuit 200, linear amplifier circuit 300 and envelope detected circuit 400, outer sensor 100 is for gathering the local discharge signal of electric system, and the local discharge signal of collection is sent to filtering circuit 200, filtering circuit 200 disturbs for suppressing the corona in described local discharge signal, noise and phone undesired signal, and the local discharge signal after suppressing is sent to linear amplifier circuit 300, linear amplifier circuit 300 is for carrying out Linear Amplifer to described local discharge signal, and the local discharge signal after Linear Amplifer is sent to envelope detected circuit 400, envelope detected circuit 400 is for carrying out envelope detected to described local discharge signal, and export local peaking's voltage of described local discharge signal.
Present embodiment, comprise the outer sensor, filtering circuit, linear amplifier circuit and the envelope detected circuit that connect successively, effectively can be suppressed mobile phone signal by filtering circuit, improve anti-interference, shelf depreciation information important in a large number in local discharge signal can be retained by envelope detected circuit, the sample frequency that Back end data gathers can be reduced again, effectively discharge bus bandwidth, reduce system power dissipation.
Wherein, for outer sensor 100, the frequency of the local discharge signal of transmission can be 300MHz-1.5GHz.
Preferably, outer sensor 100 can comprise disc ultrahigh frequency method sensor.
Further, disc ultrahigh frequency method sensor can comprise microstrip antenna model.When low frequency, it is equivalent to electric capacity.Under power frequency condition, antenna disc face forms electric capacity C with high-pressure conductor and metab respectively
1and C
2, form capacitive divider.When input impedance that is unloaded when uhf sensor or back-end circuit is larger, the power-frequency voltage of its output terminal is up to several kilovolts, and high voltage so may cause the damage of the circuit such as backend amplifier even to endanger personal safety.
For filtering circuit 200, the Hi-pass filter of series connection and the trapper of 900MHz signal can be comprised.The input end of described Hi-pass filter is connected with the output terminal of described outer sensor, and the output terminal of the trapper of described 900MHz signal is connected with the input end of described linear amplifier circuit.The cutoff frequency of described Hi-pass filter can be 300MHz.Described Hi-pass filter is used for restraint speckle and corona interference, and the trapper of described 900MHz signal is for suppressing phone undesired signal.
For linear amplifier circuit 300, local discharge signal can be carried out the linear amplification gain of 20dB.
For envelope detected circuit 400, can be that to be reduced to frequency be pulse waveform within 30MHz for the local discharge signal of 300MHz-1.5GHz by frequency.
In one embodiment, device for detecting partial discharge signal of the present utility model also can comprise protection circuit against input over-voltage 500.Protection circuit against input over-voltage 500 is connected between outer sensor 100 and filtering circuit 200.
Refer to Fig. 2, Fig. 2 is the structural representation of device for detecting partial discharge signal second embodiment of the present utility model.
The described device for detecting partial discharge signal of present embodiment and the difference of the first embodiment are: protection circuit against input over-voltage 500 can comprise protective resistance R1, first and protect electric capacity C1 and second to protect electric capacity C2; protective resistance R1 is in parallel with the signal output part of outer sensor 100; first protection electric capacity C1 is in parallel with protective resistance R1, and the second protection electric capacity C2 is connected between the first protection electric capacity C1 and filtering circuit 200.
Present embodiment, can effectively prevent high-tension local discharge signal to the loss of back-end circuit.
Preferably; according to the principle of capacitance partial pressure; power-frequency voltage produces very high dividing potential drop by outer sensor 100; too high voltage is produced for preventing outer sensor 100 output terminal; at the signal exit of outer sensor 100 protective resistance R1 in parallel; namely allow protective resistance R1 and first protection electric capacity C1 in parallel to reduce outer sensor 100 signal exit to the impedance of signal with reference to ground, make the first protection electric capacity C1 hold dividing potential drop to reduce.The equivalent schematic of outer sensor 100 output terminal after protective resistance R1 in parallel as shown in Figure 2.
Refer to Fig. 3, Fig. 3 is the structural representation of device for detecting partial discharge signal of the present utility model 3rd embodiment.
The described device for detecting partial discharge signal of present embodiment and the difference of the first embodiment are: described Hi-pass filter comprises Pyatyi Chebyshev filter.Described Pyatyi Chebyshev filter can comprise the second resistance R2, the 3rd resistance R3, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the first inductance L 1 and the second inductance L 2.Wherein, the output terminal of the second resistance R2 connects the 3rd electric capacity C3, the output terminal that the output terminal that the output terminal of the 3rd electric capacity C3 connects the 4th electric capacity C4 and the first inductance L the 1, four electric capacity C4 respectively connects the 5th electric capacity C5 and the second inductance L the 3, five electric capacity C5 respectively connects the 3rd resistance R3.
Present embodiment, the selecting frequency characteristic of Pyatyi Chebyshev filter is more obvious, better can filter local discharge signal.
Preferably, the resistance of the second resistance R2 and the 3rd resistance R3 is respectively 50 ohm, and the 3rd electric capacity C3 is 14pF, and the 4th electric capacity C4 is 7pF, and the 5th electric capacity C5 is 14pF, the first inductance L 1 and the second inductance L 2 are respectively 20nH.
Refer to Fig. 4, Fig. 4 is the structural representation of device for detecting partial discharge signal of the present utility model 4th embodiment.
The described device for detecting partial discharge signal of present embodiment and the difference of the first embodiment are: the trapper of described 900MHz signal comprises Pyatyi Chebyshev trapper.Described Pyatyi Chebyshev trapper comprises the 4th resistance R4, 5th resistance R5, 5th inductance L 5 in parallel and the 6th electric capacity C6, 3rd inductance L 3 in parallel and the 9th electric capacity C9, 8th electric capacity C8 in parallel and the 7th inductance L 7, 4th inductance L 4 in parallel and the tenth electric capacity C10, 7th electric capacity C7 in parallel and the 6th inductance L 6, the output terminal of the 4th resistance R4 connects the 5th inductance L 5 in parallel and the input end of the 6th electric capacity C6, 5th inductance L 5 in parallel is connected the 8th electric capacity C8 in parallel and the input end of the 7th inductance L 7 with the output terminal of the 6th electric capacity C6, and the 3rd inductance L 3 of parallel connection and the input end of the 9th electric capacity C9, 8th electric capacity C8 in parallel is connected the 4th inductance L 4 in parallel and the input end of the tenth electric capacity C10 with the output terminal of the 7th inductance L 7, and the 7th electric capacity C7 of parallel connection and the input end of the 6th inductance L 6, 7th electric capacity C7 in parallel is connected the 5th resistance R5 with the output terminal of the 6th inductance L 6.The output head grounding of the 5th resistance R5, the 3rd inductance L 3 in parallel and the output head grounding of the 9th electric capacity C9, the 4th inductance L 4 in parallel and the output head grounding of the tenth electric capacity C10.
Present embodiment, effectively can prevent the interference of mobile phone signal.
Preferably, the resistance of the 4th resistance R4 is 50 ohm, the resistance of the 5th resistance R5 is 50 ohm, the inductance of the 5th inductance L 5 is 3nH, the electric capacity of the 6th electric capacity C6 is 10pF, the inductance of the 3rd inductance L 3 is 12nH, the electric capacity of the 9th electric capacity C9 is 2pF, the electric capacity of the 8th electric capacity C8 is 5pF, the inductance of the 7th inductance L 7 is 6nH, the inductance of the 4th inductance L 4 is 12nH, the electric capacity of the tenth electric capacity C10 is 2pF, the electric capacity of the 7th electric capacity C7 is 10pF, the inductance of the 6th inductance L 6 is 3nH.
Refer to Fig. 5, Fig. 5 is the structural representation of device for detecting partial discharge signal of the present utility model 5th embodiment.
The described device for detecting partial discharge signal of present embodiment and the difference of the first embodiment are: linear amplifier circuit 300 can comprise the amplification chip of two cascades.Amplification chip can be ADL5320 chip.
Present embodiment, can carry out Cascaded amplification gain to local discharge signal.
As shown in Figure 5, linear amplifier circuit 300 comprises the ADL5320 chip of two cascades.ADL5320 chip has the characteristic of broadband, high-gain, low noise.Two ADL5320 cascades can realize the enlargement factor of 40dB.The major parameter of this ADL5320 chip is: gain amplifier 20dB, frequency range 100MHz-2.7GHz, noise figure 5.3dB@900MHz, supply voltage 5V.
Preferably, comprise coupling capacitance C12, coupling capacitance C11 and coupling capacitance C13 in the front stage of amplification chip, direct current signal in linear amplifier circuit 300 can be isolated.The electric capacity of coupling capacitance C12, coupling capacitance C11 and coupling capacitance C13 can be respectively 1000pF.
Refer to Fig. 6, Fig. 6 is the structural representation of device for detecting partial discharge signal of the present utility model 6th embodiment.
The described device for detecting partial discharge signal of present embodiment is with the difference of the first embodiment: linear amplifier circuit 300 also comprises shunt capacitance C14 in parallel and electrochemical capacitor E1, and shunt capacitance C11 in parallel and electrochemical capacitor E1 is connected between the power lead of amplification chip and region.
Present embodiment, can make circuit voltage stablize, and eliminates high-frequency signal to the impact of power supply.
Preferably, the electric capacity of coupling capacitance C14 is the electric capacity of 100pF and electrochemical capacitor E1 is 10uF.
Refer to Fig. 7, Fig. 7 is the structural representation of device for detecting partial discharge signal of the present utility model 7th embodiment.
The described device for detecting partial discharge signal of present embodiment and the difference of the first embodiment are: envelope detected circuit 400 can comprise detector diode, and detector diode can be equivalent to resistance R
s, non-linear resistance R
jwith integrating capacitor C
j.
Present embodiment, effectively can carry out envelope detection to local discharge signal.
Preferably, detector diode is nonlinear device, is equivalent to non-linear resistance and forms low-pass filter together with integrating capacitor, removes the high frequency carrier component in input signal, obtains the low frequency component of signal.
Further, detection diode can be high frequency detector diode HSMS-2825, and its physical model as shown in Figure 7.
Further, the parameter of high frequency detector diode: Rs is 20 Ω, I
sbe 5 × 10-6A, C
jfor 0.14pF, limiting current is I
ffor 50mA.
Refer to Fig. 8, Fig. 8 is the structural representation of device for detecting partial discharge signal of the present utility model 8th embodiment.
The described device for detecting partial discharge signal of present embodiment and the difference of the first embodiment are: envelope detected circuit 400 also can comprise detector diode D and RC parallel circuit, the input end connecting linear amplifying circuit 300 of described detection diode, the output terminal of described detection diode connects described RC parallel circuit, and described RC parallel circuit comprises load capacitance C15 in parallel and pull-up resistor R6.
Present embodiment, but output signal envelope waveform.
Preferably, the numerical value of pull-up resistor R6 is comparatively large, when the value of load capacitance C15 is chosen at high frequency, and its impedance Z
hmuch smaller than the resistance of pull-up resistor R6, can be considered short circuit, and time modulating frequency (low frequency), its impedance Z
lmuch larger than the resistance of pull-up resistor R6, can be considered open circuit.R
dfor the forward conduction resistance of detector diode D, sine wave signal U
iduring input, at its positive half cycle, detector diode D conducting, load capacitance C15 starts charging, charging rate R
dc is very little, makes the voltage U of load capacitance C15
mreach the 1st the positive peak value V of Ui very soon
p, Ui starts to decline afterwards, U
mend during >Ui, load capacitance C15 begins through R electric discharge, and because discharge time constant RC is much larger than the cycle of input signal, therefore electric discharge is very slow, U
mwhen declining few, Ui reaches the 2nd positive peak value V
p, detector diode D, again by conducting, continues to charge to load capacitance C15.So continuous circulation, just obtains signal envelope waveform.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. a device for detecting partial discharge signal, it is characterized in that, comprise outer sensor, filtering circuit, linear amplifier circuit and envelope detected circuit, described outer sensor is connected with described filtering circuit, the local discharge signal of detection is sent to described filtering circuit, described filtering circuit is connected with described linear amplifier circuit, filtered described local discharge signal is sent to described linear amplifier circuit, described linear amplifier circuit is connected with described envelope detected circuit, local discharge signal after Linear Amplifer is sent to described envelope detected circuit and carries out envelope detected.
2. device for detecting partial discharge signal according to claim 1, is characterized in that, described outer sensor comprises disc ultrahigh frequency method sensor.
3. device for detecting partial discharge signal according to claim 2, is characterized in that, described disc ultrahigh frequency method sensor comprises microstrip antenna model.
4. device for detecting partial discharge signal according to claim 1, it is characterized in that, described filtering circuit comprises the Hi-pass filter of series connection and the trapper of 900MHz signal, the input end of described Hi-pass filter is connected with the output terminal of described outer sensor, and the output terminal of the trapper of described 900MHz signal is connected with the input end of described linear amplifier circuit.
5. device for detecting partial discharge signal according to claim 4, is characterized in that, described Hi-pass filter comprises Pyatyi Chebyshev filter.
6. device for detecting partial discharge signal according to claim 4, is characterized in that, the trapper of described 900MHz signal comprises Pyatyi Chebyshev trapper.
7. device for detecting partial discharge signal according to claim 1, is characterized in that, described linear amplifier circuit comprises the amplification chip of two cascades.
8. device for detecting partial discharge signal according to claim 1, it is characterized in that, described envelope detected circuit comprises detector diode and RC parallel circuit, the input end of described detection diode connects described linear amplifier circuit, the output terminal of described detection diode connects described RC parallel circuit, and described RC parallel circuit comprises load capacitance in parallel and pull-up resistor.
9. device for detecting partial discharge signal as claimed in any of claims 1 to 8, is characterized in that, also comprises protection circuit against input over-voltage, and described protection circuit against input over-voltage is connected between described outer sensor and described filtering circuit.
10. device for detecting partial discharge signal according to claim 9; it is characterized in that; described protection circuit against input over-voltage comprises protective resistance, the first protection electric capacity and the second protection electric capacity; described protective resistance is in parallel with the signal output part of described outer sensor; described first protection electric capacity is in parallel with described protective resistance, and described second protection capacitances in series is between described first protection electric capacity and described filtering circuit.
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| CN201420622508.0U CN204166091U (en) | 2014-10-23 | 2014-10-23 | Device for detecting partial discharge signal |
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| CN201420622508.0U CN204166091U (en) | 2014-10-23 | 2014-10-23 | Device for detecting partial discharge signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267326A (en) * | 2014-10-23 | 2015-01-07 | 广州供电局有限公司 | Partial discharge signal detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267326A (en) * | 2014-10-23 | 2015-01-07 | 广州供电局有限公司 | Partial discharge signal detection system |
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Effective date of registration: 20231110 Address after: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Patentee after: SHANGHAI JIAO TONG University Address before: 510620, No. two, No. 2, Tianhe South Road, Guangzhou, Guangdong, Tianhe District Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. Patentee before: SHANGHAI JIAO TONG University |