CN110879337A - Oscillating wave voltage generating circuit and cable partial discharge detection device - Google Patents
Oscillating wave voltage generating circuit and cable partial discharge detection device Download PDFInfo
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- CN110879337A CN110879337A CN201911075037.XA CN201911075037A CN110879337A CN 110879337 A CN110879337 A CN 110879337A CN 201911075037 A CN201911075037 A CN 201911075037A CN 110879337 A CN110879337 A CN 110879337A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention relates to an oscillating wave voltage generating circuit and a cable partial discharge detection device. An oscillator voltage generating circuit for generating an oscillator voltage, comprising: the inductor and the capacitor module, the capacitor unit includes a sample capacitor and a frequency conversion voltage stabilization unit, the inductor and the sample capacitor are connected in series to form a series resonance circuit to generate an oscillation wave voltage, the frequency conversion voltage stabilization unit is connected in parallel to two ends of the sample capacitor, and the frequency conversion voltage stabilization unit is used for adjusting the capacitance value of the capacitor module to change the frequency of the oscillation wave voltage. Thereby the frequency of the voltage of the oscillation wave is adjusted through the capacitance value of adjusting the capacitance module to above-mentioned oscillation wave voltage to satisfy experimental requirement.
Description
Technical Field
The invention relates to the technical field of oscillation waves, in particular to an oscillation wave voltage generating circuit and a cable partial discharge detection device.
Background
In order to ensure the reliable operation of the cable, the abnormal phenomenon of the cable needs to be found in time, and the aging state of the cable insulation needs to be mastered, so that the insulation performance of the cable needs to be monitored periodically and nondestructively. The partial discharge test diagnosis technology is a nondestructive detection technology and is an effective evaluation method for the insulation performance of the cable.
The existing partial discharge test methods of the cable mainly comprise the following steps: a direct current voltage test method, an ultra low frequency voltage test method, a resonance alternating current voltage test method, and an oscillatory wave voltage test method. Compared with the first three pressurized other test methods, the oscillatory wave voltage test method has the advantages of small damage to the cable in the test process, capability of effectively detecting and diagnosing the insulation state of the cable, small volume, convenience in field operation and the like, so that the oscillatory wave voltage test method is commonly adopted to detect the insulation performance of the cable.
However, when the traditional cable partial discharge detection device detects the insulation performance of the cable by using the oscillatory wave test method, only oscillatory wave voltage with fixed frequency can be generated, and the test requirements cannot be met.
Disclosure of Invention
Therefore, it is necessary to provide an oscillatory wave voltage generating circuit and a cable partial discharge detection device for solving the problem that the conventional cable partial discharge detection device can only generate oscillatory wave voltage with fixed frequency and cannot meet the test requirements when the oscillatory wave test method is adopted to detect the insulation performance of the cable.
An oscillator voltage generating circuit for generating an oscillator voltage, comprising: the inductor and the capacitor module, the capacitor unit includes a sample capacitor and a frequency conversion voltage stabilization unit, the inductor and the sample capacitor are connected in series to form a series resonance circuit to generate an oscillation wave voltage, the frequency conversion voltage stabilization unit is connected in parallel to two ends of the sample capacitor, and the frequency conversion voltage stabilization unit is used for adjusting the capacitance value of the capacitor module to change the frequency of the oscillation wave voltage.
The oscillating wave voltage generating circuit comprises an inductor and a capacitor module, wherein the capacitor module comprises a test article capacitor and a variable frequency voltage stabilizing unit. Inductance and sample electric capacity constitute series resonance circuit after establishing ties in order to produce the shock ripples voltage, and frequency conversion voltage stabilizing unit connects in parallel in the both ends of sample electric capacity, and the capacitance value of electric capacity module is the equivalent capacitance value of sample electric capacity and frequency conversion voltage stabilizing unit for thereby adjust the frequency of shock ripples voltage through the capacitance value of adjusting electric capacity module, thereby satisfy experimental requirement. In addition, to current resonant circuit, needn't dismantle and change inductance or sample electric capacity in order to change inductance value or capacitance value, convenient to use.
In one embodiment, the capacitor module further includes a capacitor selection switch unit, the number of the variable frequency voltage stabilization units is multiple, capacitance values of the variable frequency voltage stabilization units are different, and the capacitor selection switch unit is configured to select one of the variable frequency voltage stabilization units to be connected in parallel to two ends of the test capacitor.
In one embodiment, the frequency of the oscillating wave voltage is calculated by the following formula:
wherein f is the frequency of the oscillating wave voltage, L is the inductance value of the inductor, and C is the capacitance value of the variable frequency voltage stabilization unit.
In one embodiment, the variable-frequency voltage-stabilizing unit comprises a capacitor.
In one embodiment, the number of the capacitors is multiple and the capacitors are connected in series with each other.
In one embodiment, the capacitance values of the plurality of capacitors are the same.
In one embodiment, the capacitance of the variable-frequency voltage stabilizing unit ranges from 0 to 1 uF.
In one embodiment, the test device further comprises an inductance selection switch unit, the number of the inductances is multiple, and the inductance selection unit is used for selecting one of the inductances to be connected with the test article capacitor in series.
A cable partial discharge detection device comprises the oscillating wave voltage generating circuit.
In one embodiment, the device further comprises a power supply, a data acquisition unit and a control unit, wherein the control unit is connected with the power supply and the data acquisition unit, the power supply is connected in parallel with two ends of the test article capacitor, the control unit is used for controlling the power supply to charge the test article capacitor and the variable-frequency voltage stabilization unit, the data acquisition unit is further connected with the cable to acquire a pulse current signal generated by a partial discharge part of the cable, and the control unit is further used for receiving the pulse current signal and analyzing the pulse current signal.
Drawings
Fig. 1 is a circuit block diagram of an oscillating wave voltage generating circuit in an embodiment.
Fig. 2 is a circuit diagram of an oscillating wave voltage generating circuit in the first embodiment.
Fig. 3 is a circuit diagram of an oscillating wave voltage generating circuit in a second embodiment.
Fig. 4 is a circuit diagram of an oscillating wave voltage generating circuit in a third embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The traditional cable partial discharge detection device can only generate oscillation wave voltage with fixed frequency when the insulation performance of the cable is detected by adopting an oscillation wave test method, and cannot meet test requirements, so that the application provides an oscillation wave voltage generation circuit for generating oscillation wave voltage with adjustable frequency and a cable partial discharge detection device based on the oscillation wave voltage test method to evaluate the insulation performance of the cable, and the test requirements are met. The oscillatory wave voltage generating circuit will be described in detail below.
Fig. 1 is a circuit block diagram of an oscillating wave voltage generating circuit in an embodiment. As shown in fig. 1, the oscillating wave voltage generating circuit includes an inductor L1 and a capacitor module 100, wherein the capacitor module 100 includes a test capacitor CX and a variable-frequency voltage regulator unit 110.
Inductance L1 establishes ties with sample electric capacity CX and constitutes series resonance circuit, and when the back of charging sample electric capacity CX, series resonance circuit can produce and vibrate the ripples voltage. The frequency conversion voltage stabilization unit 110 is connected in parallel to two ends of the sample capacitor CX, and the frequency conversion voltage stabilization unit 110 is used for adjusting the capacitance value of the capacitor module 100 to change the frequency of the oscillating wave voltage.
The oscillating wave voltage generating circuit includes an inductor L1 and a capacitor module 100, wherein the capacitor module 100 includes a test capacitor CX and a variable-frequency voltage-stabilizing unit 110. Inductance L1 and test article electric capacity CX constitute series resonance circuit after establishing ties in order to produce the shock wave voltage, and frequency conversion voltage stabilizing unit 110 connects in parallel at the both ends of test article electric capacity CX, and the capacitance value of capacitance module 110 is the equivalent capacitance value of test article electric capacity CX and frequency conversion voltage stabilizing unit 110 for thereby adjust the frequency of shock wave voltage through the capacitance value of adjusting capacitance module 110, thereby satisfy experimental requirement. In addition, for current resonant circuit, need not dismantle and change inductance L1 or sample electric capacity CX in order to change inductance value or capacitance value, convenient to use.
For example, referring to fig. 2, the variable frequency voltage stabilizing unit 110 includes a capacitor. The number of the capacitors may be one or more, and when a plurality of capacitors are included in the variable frequency voltage stabilizing unit 110, the capacitors are connected in series with each other. In the present embodiment, the variable frequency voltage regulator unit 110 includes a capacitor C1, a capacitor C2, and a capacitor C3 connected in series and having the same or approximately the same capacitance value. In other embodiments, the capacitance values of the capacitors in the variable frequency voltage stabilizing unit 110 may also be different.
It can be understood that, when charging the test article electric capacity CX through the high voltage DC power supply, if the test article electric capacity CX is less, then the voltage that can't make the test article electric capacity CX is stable at predetermineeing the magnitude of voltage, so in this embodiment can make the capacitance value grow in the both ends parallel capacitance of test article electric capacity CX, avoid appearing the problem that the less load of capacitance value can't stabilize the voltage. Moreover, when the oscillating wave voltage is high and the variable frequency voltage stabilizing unit 110 includes capacitors, the capacitors connected in series and having similar or same capacitance values can have the function of voltage sharing, so that the capacitor is prevented from being damaged due to the fact that voltage borne by one capacitor is high.
Fig. 3 is a circuit diagram of an oscillating wave voltage generating circuit in a second embodiment. As shown in fig. 3, the capacitor module 100 further includes a capacitor selection switch unit 120, and the number of the variable frequency voltage stabilizing units 110 is multiple, and the equivalent capacitance values of the variable frequency voltage stabilizing units 110 are different. The capacitance selection switch unit 120 is used for selecting one of the variable frequency voltage stabilizing units 110 to be connected in parallel with two ends of the sample capacitance CX. For example, the capacitance selection switch unit 120 is a single-pole multi-throw switch. In this embodiment, the capacitance selection switch unit 120 is configured to select one of the 3 sets of the variable frequency voltage stabilization units 110, so that the selected variable frequency voltage stabilization unit 110 is connected in parallel to two ends of the sample capacitance CX. The three sets of variable frequency voltage stabilizing units 110 respectively include capacitors C1-C3, capacitors C4-C6, and capacitors C7-C9. In this embodiment, the position at which the capacitance selection switch unit 120 is closed may be changed according to actual requirements, so as to select one of the variable frequency voltage stabilization units 110, and because each variable frequency voltage stabilization unit 110 has a different capacitance value, so as to generate oscillation wave voltages of a plurality of different frequencies by selecting different variable frequency voltage stabilization units 110, without carrying a plurality of different inductors and capacitors with different parameters, and may share one inductor L1, thereby reducing the number of required components and parts, and saving cost.
The frequency of the oscillating wave voltage is related to the parameters of each device in the oscillating wave voltage generating circuit, and the calculation formula is as follows:
where f is the frequency of the oscillating voltage, L is the inductance of the inductor L1, and C is the capacitance of the variable-frequency voltage-stabilizing unit 110. Optionally, the value range of the equivalent capacitance C of the variable-frequency voltage-stabilizing unit 110 is 0-1 uF.
Illustratively, the inductance value of the inductor L1 is 0.3H, the capacitance values of the capacitors C1 to C3 are all 2.7uF, the capacitance values of the capacitors C4 to C6 are all 1.5uF, the capacitance values of the capacitors C7 to C9 are all 0.3uF, and when the branch where the capacitors C1 to C3 are located is selected by the capacitor selection switch unit 120, the frequency of the oscillating wave voltage is 306 Hz; when the capacitance selection switch unit 120 selects the branch where the capacitances C4 to C6 are located, the frequency of the oscillating wave voltage is 411 Hz; when the capacitance selection switch unit 120 selects the branch where the capacitances C7 to C9 are located, the frequency of the oscillating wave voltage is 919 Hz.
It should be noted that the oscillating wave voltage generating circuit in the present application is not limited to the number of the variable frequency voltage stabilizing units 110 provided in the above embodiments, and the number and the size of the capacitance values included in the variable frequency voltage stabilizing units 110.
In a third embodiment, referring to fig. 4, the oscillating wave voltage generating circuit includes a sample capacitor CX, a variable frequency voltage stabilizing unit 110 connected in parallel with the sample capacitor CX, an inductance selection switch unit 200, and a plurality of inductances, wherein the inductance selection unit 200 is used for selecting one of the inductances to be connected in series with the sample capacitor CX. In this embodiment, the selection switch unit 200 selects one of the inductor L1, the inductor L2, and the inductor L3 to be connected in series with the test capacitor CX, and the inductor selection switch unit 200 can change the magnitude of the inductor in the oscillating wave voltage generating circuit, so as to change the frequency of the oscillating wave voltage, and thus the adjustable range of the frequency of the oscillating wave voltage is wider. In other embodiments. Each inductance branch can also be formed by connecting a plurality of inductors in series.
In an embodiment, the cable partial discharge detection apparatus includes the oscillating wave voltage generating circuit in any of the above embodiments. Furthermore, the cable partial discharge detection device also comprises a power supply, a data acquisition unit and a control unit. Wherein, the control unit is connected with the power and is connected with the data acquisition unit, and the power is parallelly connected in the both ends of sample electric capacity CX, and the control unit is used for the control power to charge for sample electric capacity and frequency conversion voltage stabilizing unit, and after the completion of charging, the voltage at sample electric capacity CX both ends is stabilized in predetermineeing voltage to through series resonance oscillation wave voltage that produces. The data acquisition unit is connected with the cable and is exported the control unit in order to gather the pulse current signal that its partial discharge position produced to make control unit carry out the analysis to pulse current signal, whether the insulating properties of this section cable need be maintained through control unit's analysis result to testing personnel, and the not good specific position of cable insulating properties etc.. Optionally, cable partial discharge detection device can also be including detecting feedback module, it is used for detecting and exporting the frequency of oscillatory wave voltage to detect feedback module, make the tester can know whether the error of the frequency of the oscillatory wave voltage that actually is used for detecting and predetermined frequency is in permissible range, thereby can know whether the accuracy when carrying out oscillatory wave voltage test to the insulating properties of cable meets the requirements, if the frequency of the oscillatory wave voltage that the test detection obtained differs too much with predetermined frequency, then can make the accuracy of the aassessment of influence to the cable.
For the above embodiments, the capacitance selection switch and the inductance selection switch may be manually selected or automatically selected. For example, the control unit is further connected to the capacitance selection switch, and selects a closing position of the capacitance selection switch according to a frequency requirement of the oscillating wave voltage, so as to automatically control the capacitance selection switch.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An oscillator voltage generating circuit for generating an oscillator voltage, comprising: the inductor and the capacitor module, the capacitor unit includes a sample capacitor and a frequency conversion voltage stabilization unit, the inductor and the sample capacitor are connected in series to form a series resonance circuit to generate an oscillation wave voltage, the frequency conversion voltage stabilization unit is connected in parallel to two ends of the sample capacitor, and the frequency conversion voltage stabilization unit is used for adjusting the capacitance value of the capacitor module to change the frequency of the oscillation wave voltage.
2. The oscillating wave voltage generating circuit of claim 1, wherein the capacitor module further comprises a plurality of capacitor selection switch units, the number of the variable frequency voltage stabilizing units is plural, and the capacitance values of the variable frequency voltage stabilizing units are different, and the capacitor selection switch unit is configured to select one of the variable frequency voltage stabilizing units to be connected in parallel to two ends of the test capacitor.
3. The oscillating wave voltage generating circuit of claim 1, wherein the frequency of the oscillating wave voltage is calculated by the formula:
wherein f is the frequency of the oscillating wave voltage, L is the inductance value of the inductor, and C is the capacitance value of the variable frequency voltage stabilization unit.
4. The oscillatory wave voltage generating circuit of claim 1, wherein the variable frequency voltage stabilizing unit comprises a capacitor.
5. The oscillatory wave voltage generation circuit of claim 4, wherein the capacitors are plural and connected in series.
6. The oscillatory wave voltage generating circuit of claim 5, wherein the capacitors have the same capacitance.
7. The oscillating wave voltage generating circuit of claim 1, wherein the capacitance of the variable frequency voltage regulator unit is in a range of 0-1 uF.
8. The oscillating wave voltage generating circuit of claim 1, further comprising a plurality of inductance selection switch units, wherein the inductance selection switch units are used for selecting one of the inductances to be connected in series with the sample capacitor.
9. A cable partial discharge detection device, comprising the oscillatory wave voltage generation circuit according to any one of claims 1 to 8.
10. The cable partial discharge detection device of claim 9, further comprising a power supply, a data acquisition unit, and a control unit, wherein the control unit is connected to the power supply and the data acquisition unit, the power supply is connected in parallel to two ends of the sample capacitor, the control unit is configured to control the power supply to charge the sample capacitor and the variable-frequency voltage stabilization unit, the data acquisition unit is further connected to the cable to acquire a pulse current signal generated at a partial discharge portion of the cable, and the control unit is further configured to receive the pulse current signal and analyze the pulse current signal.
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| CN201911075037.XA CN110879337A (en) | 2019-11-06 | 2019-11-06 | Oscillating wave voltage generating circuit and cable partial discharge detection device |
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| CN201911075037.XA CN110879337A (en) | 2019-11-06 | 2019-11-06 | Oscillating wave voltage generating circuit and cable partial discharge detection device |
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Effective date of registration: 20201019 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
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Application publication date: 20200313 |