CN211043565U - Partial discharge signal acquisition device - Google Patents
Partial discharge signal acquisition device Download PDFInfo
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- CN211043565U CN211043565U CN201921725316.1U CN201921725316U CN211043565U CN 211043565 U CN211043565 U CN 211043565U CN 201921725316 U CN201921725316 U CN 201921725316U CN 211043565 U CN211043565 U CN 211043565U
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Abstract
The utility model discloses a partial discharge signal acquisition device, which relates to the field of partial discharge detection of power cables and solves the problems that when the partial discharge detection is carried out in the prior art, because of the low reliability and the electromagnetic interference, the problem of unstable signal collection is solved, the input switching unit (1) of the utility model comprises an integrated circuit IC1, the band-pass filtering unit (2) comprises a band-pass filtering circuit a, a band-pass filtering circuit b and a band-pass filtering circuit c, output switch unit (3) includes integrated circuit IC2, the output of three band-pass filter circuit of band-pass filter unit (2) with integrated circuit IC 2's three gating input port one-to-one links to each other, the utility model discloses an integrated circuit has simplified the design, has increased system reliability, has increased the anti-interference ability of system to prevent electromagnetic interference coupling to line input end.
Description
Technical Field
The utility model relates to a power cable partial discharge detection area, concretely relates to partial discharge signal collection system.
Background
Partial discharge, called partial discharge for short, is a great potential safety hazard in the operation of a power cable, is a sign of cable insulation degradation, and is also one of important reasons for causing insulation degradation. Therefore, the method has important significance and economic value for partial discharge signal detection and positioning research of the power cable. Related local discharge signal testing standards are established by IEC and various countries in the world, weak links in an insulation system are found in time through detection of local discharge signals, fault reasons are found out, the quality of a power cable is guaranteed, and safe and reliable operation of a power system is guaranteed.
The existing ultrahigh frequency partial discharge monitoring device is used for monitoring the partial discharge condition of the high-voltage power transmission and distribution cable. When a partial discharge phenomenon occurs in the device, an ultrahigh frequency signal is generated, the high frequency signal is subjected to analog-to-digital conversion and analysis operation through the detection of the partial discharge sensor, and in the partial discharge signal acquisition unit, the acquired discharge pulse signal is superposed on the power frequency phase of the detection circuit to obtain a corresponding partial discharge pulse phase map so as to analyze the defect type of the partial discharge generation device. Therefore, the frequency bandwidth of the collected signal is very critical, however, the bandwidth of the existing monitoring device is switched by adopting a mechanical mode of combining relays, the method has the disadvantages of short service life of complicated circuit devices, low operation reliability, easy generation of new interference sources and external interference on the signal, and instability of the collected signal.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a partial discharge signal collection system for solve prior art and when carrying out the partial discharge and examine time measuring, there is electromagnetic interference because of the reliability is not high, lead to gathering the unstable problem of signal.
The utility model adopts the technical proposal that:
the utility model provides a partial discharge signal collection system, includes input switch unit, band-pass filter unit and output switch unit, the input switch unit includes integrated circuit IC1, integrated circuit IC1 includes input IN, input decoder D1, power end V1 and gating output port a1, b1 and c1, the band-pass filter unit includes band-pass filter circuit a, band-pass filter circuit b and band-pass filter circuit c, the output switch unit includes integrated circuit IC2, integrated circuit IC2 includes gating input port a2, b2 and c2, the input of three band-pass filter circuit of band-pass filter unit with three gating output port one-to-one of integrated circuit IC1 link to each other, the output of three band-pass filter circuit of band-pass filter unit with three gating input port one-to-one of integrated circuit IC2 links to each other, integrated IC2 still includes output decoder D2, b1, b1 is connected to each other, A power supply terminal V2 and an output terminal OUT.
The collected partial discharge signal enters the input switching unit from an input end IN of the integrated circuit IC1, is decoded and gated by an input decoder D1, and is output to the band-pass filtering unit from a gating output port a1 or b1 or c1, and the received signal is transmitted to the output switching unit through the corresponding band-pass filtering circuit a or b or c by the band-pass filtering unit and is finally output by the output switching unit.
Further, the input switching unit further includes a dc blocking coupling capacitor C14, one end of the dc blocking coupling capacitor C14 is connected to the input signal, and the other end of the dc blocking coupling capacitor C14 is connected to the input terminal IN.
The direct current blocking coupling capacitor C14 can effectively transmit the collected alternating current signals and block direct current, so that common mode signals are suppressed.
Further, the size of the blocking coupling capacitor C14 is 1 μ F.
Further, the input switching unit further comprises power supply filter capacitors C1 and C2, wherein one end of each of the power supply filter capacitors C1 and C2 is connected with the power supply end V1 after being connected in parallel, the other end of each of the power supply filter capacitors C3 and C4 is connected with an alternating current power supply, one end of each of the power supply filter capacitors C3 and C4 is connected with the power supply end V2 after being connected in parallel, and the other end of each of the power supply filter capacitors C3 and C4 is connected with the alternating current power supply.
The two power supply filter capacitors are connected in parallel for filtering, so that alternating current interference signals in a large range can be effectively filtered, and the circuit works more stably.
Further, the size of the power supply filter capacitor C1 is 0.1 μ F, the size of the power supply filter capacitor C2 is 0.01 μ F, the size of the power supply filter capacitor C3 is 0.1 μ F, and the size of the power supply filter capacitor C4 is 0.01 μ F.
Further, the input decoder D1 is supplied with power from the ac power supply supplied from the power supply terminal V1, the input decoder D1 is controlled by two control lines SA, SB, the output decoder D2 is supplied with power from the ac power supply supplied from the power supply terminal V2, and the input decoder D2 is controlled by two control lines SC, SD.
Further, three band-pass filter circuit structures of the band-pass filter unit are the same, each band-pass filter circuit comprises a first capacitor, a second capacitor, a third inductor and two inductors, the first capacitor, the second capacitor and the third capacitor are sequentially connected in series, one end, away from the second capacitor, of the first capacitor is connected with the input switching unit, one end, away from the second capacitor, of the third capacitor is connected with the output switching unit, the two inductors are connected in series and then connected with the two ends of the second capacitor in parallel, and one point of the two inductors is grounded.
Three L C passive filter circuits with different pass bands are formed by arranging capacitance inductors with different sizes, so that signals with three different frequency bandwidths are transmitted.
Furthermore, the first capacitor C5, the second capacitor C7 and the third capacitor C6 of the band-pass filter circuit a are 51.54nF, 15.92nF and 51.54nF, the two inductors L1 and L2 of the band-pass filter circuit a are 49.2 μ H, the first capacitors C8, C10 and C9 of the band-pass filter circuit b are 1.72nF, 0.53nF and 1.72nF, the two inductors L3 and L4 of the band-pass filter circuit b are 1.64 μ H, the first capacitors C11, C13 and C12 of the band-pass filter circuit C are 515pF, 159pF and 515pF, respectively, and the two inductors L5 and L6 of the band-pass filter circuit C are 0.49 μ H.
Further, the integrated circuit IC1 and the integrated circuit IC2 are HMC 245A.
HMC245A is a low cost reflective SP3T switch, packaged with a 16 pin QSOP surface mount package, with a switching frequency in the range of DC to 3.5GHz, providing 30 to 40dB isolation and 0.7dB low insertion loss, a 2:3TT L/CMOS compatible decoder integrated on the switch, requiring only two control lines and a single +5V bias to select each path, thus replacing the 6 control lines typically required for GaAs SP3T switches.
The principle of the utility model is that: the input switching unit collects partial discharge signals and switches the partial discharge signals to corresponding frequency bands, then the band-pass filtering unit outputs required frequency bandwidth signals to the backward stage, and finally the output switching unit selects corresponding bandwidth signals and outputs partial discharge signals.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the integrated circuit is adopted, the design is simplified, the system reliability is improved, and the anti-interference performance of the system is improved, so that the electromagnetic interference is prevented from being coupled to the line input end, and meanwhile, the anti-interference performance of the acquired signal is greatly improved through the acquisition circuit under the condition of strong electromagnetic interference outdoors.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart of signal acquisition;
FIG. 2 is a schematic structural diagram of an input switching unit;
FIG. 3 is a schematic diagram of an output switching unit;
FIG. 4 is a circuit diagram of an input switching unit;
FIG. 5 is a circuit diagram of a band pass filter unit;
FIG. 6 is a circuit diagram of an output switching unit;
fig. 7 is a general circuit diagram.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Examples
The partial discharge signal acquisition device shown IN fig. 1-3 comprises an input switching unit 1, a band-pass filtering unit 2 and an output switching unit 3, wherein the input switching unit 1 comprises an integrated circuit IC1, the integrated circuit IC1 comprises an input terminal IN, an input decoder D1, a power terminal V1, gating output ports a1, b1 and c1, the band-pass filtering unit 2 comprises a band-pass filtering circuit a, a band-pass filtering circuit b and a band-pass filtering circuit c, the output switching unit 3 comprises an integrated circuit IC2, the integrated circuit IC2 comprises gating input ports a2, b2 and c2, the input terminals of three band-pass filtering circuits of the band-pass filtering unit 2 are correspondingly connected with three gating output ports of an integrated circuit IC1, the output terminals of three band-pass filtering circuits of the band-pass filtering unit 2 are correspondingly connected with three gating input ports of an integrated circuit IC2, the integrated circuit IC2 further comprises output decoders D2, b, A power supply terminal V2 and an output terminal OUT.
On the basis of the above embodiment, the input switching unit 1 further includes a dc blocking coupling capacitor C14, one end of the dc blocking coupling capacitor C14 is connected to the input signal, the other end of the dc blocking coupling capacitor C14 is connected to the input terminal IN, the size of the dc blocking coupling capacitor C14 is 1 μ F, and the dc blocking coupling capacitor C14 can effectively transmit the collected ac signal and block the dc signal, thereby suppressing the common mode signal.
On the basis of the above embodiment, the input switching unit 1 further includes power supply filter capacitors C1 and C2, the power supply filter capacitors C1 and C2 are connected in parallel, and then one end of each power supply filter capacitor is connected to the power supply terminal V1, and the other end of each power supply filter capacitor is connected to the ac power supply, the output switching unit 3 further includes power supply filter capacitors C3 and C4, the power supply filter capacitors C3 and C4 are connected in parallel, then one end of each power supply filter capacitor is connected to the power supply terminal V2, and the other end.
On the basis of the previous embodiment, the size of the power supply filter capacitor C1 is 0.1 μ F, the size of the power supply filter capacitor C2 is 0.01 μ F, the size of the power supply filter capacitor C3 is 0.1 μ F, and the size of the power supply filter capacitor C4 is 0.01 μ F.
Based on the above embodiment, the input decoder D1 is powered by the ac power supplied from the power supply terminal V1, the input decoder D1 is controlled by the two control lines SA, SB, the output decoder D2 is powered by the ac power supplied from the power supply terminal V2, and the input decoder D2 is controlled by the two control lines SC, SD.
On the basis of the previous embodiment, the structures of the three band-pass filter circuits of the band-pass filter unit 2 are the same, each band-pass filter circuit comprises a first capacitor, a second capacitor, a third capacitor and two inductors, the first capacitor, the second capacitor and the third capacitor are sequentially connected in series, one end of the first capacitor, far away from the second capacitor, is connected with the input switching unit 1, one end of the third capacitor, far away from the second capacitor, is connected with the output switching unit 3, the two inductors are connected in parallel at two ends of the second capacitor after being connected in series, and one point between the two inductors is grounded.
On the basis of the above embodiment, the first capacitor C5, the second capacitor C7, and the third capacitor C6 of the band-pass filter circuit a have sizes of 51.54nF, 15.92nF, and 51.54nF, respectively, the two inductors L1 and L2 of the band-pass filter circuit a have sizes of 49.2 μ H, the first capacitors C8, C10, and C9 of the band-pass filter circuit b have sizes of 1.72nF, 0.53nF, and 1.72nF, the two inductors L3 and L4 of the band-pass filter circuit b have sizes of 1.64 μ H, the first capacitors C11, C13, and C12 of the band-pass filter circuit C have sizes of 515pF, 159pF, and 515pF, and the two inductors L5 and L6 of the band-pass filter circuit C have sizes of 0.49 μ H.
In the embodiments shown in FIGS. 4-7, the integrated circuit IC1, the integrated circuit IC2 are HMC245A, the HMC245A is a low-cost reflective SP3T switch, and the switch is a 16-pin QSOP surface mount package, has a frequency range of DC to 3.5GHz, provides 30 to 40dB isolation and low insertion loss of 0.7dB, and is integrated with a 2:3TT L/CMOS compatible decoder, and each path can be selected by only two control lines and a single +5V bias, thereby replacing 6 control lines normally required by GaAs SP3T switches.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A partial discharge signal acquisition device is characterized in that: including input switch unit (1), band-pass filter unit (2) and output switch unit (3), input switch unit (1) includes integrated circuit IC1, integrated circuit IC1 includes input IN, input decoder D1, power end V1 and gating output port a1, b1 and c1, band-pass filter unit (2) includes band-pass filter circuit a, band-pass filter circuit b and band-pass filter circuit c, output switch unit (3) includes integrated circuit IC2, integrated circuit IC2 includes gating input port a2, b2 and c2, the input of three band-pass filter circuits of band-pass filter unit (2) with integrated circuit IC 1's three gating output port one-to-one links to each other, the output of three band-pass filter circuits of band-pass filter unit (2) with integrated circuit IC 2's three gating input port one-to-one links to each other, the integrated circuit IC2 further includes an output decoder D2, a power supply terminal V2, and an output terminal OUT.
2. A partial discharge signal acquisition apparatus as claimed in claim 1, wherein: the input switching unit (1) further comprises a blocking coupling capacitor C14, one end of the blocking coupling capacitor C14 is connected with an input signal, and the other end of the blocking coupling capacitor C14 is connected with the input end IN.
3. A partial discharge signal acquisition apparatus according to claim 2, wherein: the size of the direct blocking coupling capacitor C14 is 1 muF.
4. A partial discharge signal acquisition apparatus as claimed in claim 1, wherein: the input switching unit (1) further comprises power supply filter capacitors C1 and C2, one ends of the power supply filter capacitors C1 and C2 are connected in parallel and then connected with the power supply end V1, the other ends of the power supply filter capacitors C1 and C2 are connected with an alternating current power supply, the output switching unit (3) further comprises power supply filter capacitors C3 and C4, one ends of the power supply filter capacitors C3 and C4 are connected in parallel and then connected with the power supply end V2, and the other ends of the power supply filter capacitors C3 and C36.
5. A partial discharge signal acquisition apparatus according to claim 4, wherein: the size of the power supply filter capacitor C1 is 0.1 muF, the size of the power supply filter capacitor C2 is 0.01 muF, the size of the power supply filter capacitor C3 is 0.1 muF, and the size of the power supply filter capacitor C4 is 0.01 muF.
6. A partial discharge signal acquisition apparatus as claimed in claim 1, wherein: the input decoder D1 is powered by the ac power supply entering from the power supply terminal V1, the input decoder D1 is controlled by two control lines SA, SB, the output decoder D2 is powered by the ac power supply entering from the power supply terminal V2, and the input decoder D2 is controlled by two control lines SC, SD.
7. A partial discharge signal acquisition apparatus as claimed in claim 1, wherein: the three band-pass filter circuits of the band-pass filter unit (2) are identical in structure, each band-pass filter circuit comprises a first capacitor, a second capacitor, a third capacitor and two inductors, the first capacitor, the second capacitor and the third capacitor are sequentially connected in series, one end, away from the second capacitor, of the first capacitor is connected with the input switching unit (1), one end, away from the second capacitor, of the third capacitor is connected with the output switching unit (3) in series, the two inductors are connected with the two ends of the second capacitor in parallel after being connected in series, and one point of the two inductors is grounded.
8. The partial discharge signal acquisition device as claimed in claim 7, wherein the first capacitor C5, the second capacitor C7 and the third capacitor C6 of the band-pass filter circuit a have sizes of 51.54nF, 15.92nF and 51.54nF respectively, the two inductors L, L of the band-pass filter circuit a have sizes of 49.2 μ H, the first capacitors C8, C10 and C9 of the band-pass filter circuit b have sizes of 1.72nF, 0.53nF and 1.72nF respectively, the two inductors L and L of the band-pass filter circuit b have sizes of 1.64 μ H, the first capacitors C11, C13 and C12 of the band-pass filter circuit C have sizes of 515pF, 159pF and 515pF respectively, and the two inductors L and L of the band-pass filter circuit C have sizes of 0.49 μ H.
9. The partial discharge signal acquisition apparatus according to any one of claims 1 to 8, wherein: the integrated circuit IC1 and the integrated circuit IC2 are HMC 245A.
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| CN201921725316.1U CN211043565U (en) | 2019-10-15 | 2019-10-15 | Partial discharge signal acquisition device |
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| CN201921725316.1U CN211043565U (en) | 2019-10-15 | 2019-10-15 | Partial discharge signal acquisition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379232A (en) * | 2020-11-13 | 2021-02-19 | 南方电网数字电网研究院有限公司 | High-frequency partial discharge sensing circuit, device and high-frequency partial discharge detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379232A (en) * | 2020-11-13 | 2021-02-19 | 南方电网数字电网研究院有限公司 | High-frequency partial discharge sensing circuit, device and high-frequency partial discharge detection system |
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