CN103439637A - Device and method for oscillatory wave generation in electrical device partial discharge test - Google Patents
Device and method for oscillatory wave generation in electrical device partial discharge test Download PDFInfo
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- CN103439637A CN103439637A CN2013103535494A CN201310353549A CN103439637A CN 103439637 A CN103439637 A CN 103439637A CN 2013103535494 A CN2013103535494 A CN 2013103535494A CN 201310353549 A CN201310353549 A CN 201310353549A CN 103439637 A CN103439637 A CN 103439637A
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Abstract
The invention provides a device for oscillatory wave generation in an electrical device partial discharge test. The device comprises a first switch set, a second switch set, a fifth switch, a power supply, a damping resistor with the adjustable resistance value and an LC oscillating circuit. The first switch set comprises a first switch and a fourth switch. The second switch set comprises a second switch and a third switch. A series circuit composed of the first switch and the second switch, a series circuit composed of the third switch and the fourth switch and the power supply are in parallel connection. A circuit between the first switch and the second switch is connected with one end of the fifth switch. A circuit between the third switch and the fourth switch is connected with the other end of the fifth switch. The LC oscillating circuit and the damping resistor are in series connection and then in parallel connection with the fifth switch. The invention further provided with a method for oscillatory wave generation in the electrical device partial discharge test. High-voltage test oscillatory waves can be generated through the direct-current low-voltage excitation power supply and the electronic switches.
Description
Technical field
The present invention relates to a kind of generation device and method of the wave of oscillation based on continuous-current excitation, be specifically related to a kind of apparatus for generating oscillating wave and method for the local discharge of electrical equipment test.
Background technology
The basic detection method of insulation of electrical installation performance is carried out the withstand voltage and partial discharge quantity of sine wave to electrical equipment and is measured, and generalized case adopts the method for the direct load test voltage of testing transformer to be tested.But, when test specimen equivalent electric capacity is very large and its trial voltage when very high, the capacity by testing transformer load test voltage can be very large, causes scene can't complete test, makes this simple and easy to do method inefficacy.A kind of feasible technical scheme adopts the wave of oscillation to carry out the withstand voltage and partial discharge test of sine wave to electrical equipment exactly, can reduce the capacity of testing equipment.
In recent years, both at home and abroad for detection of wave of oscillation equipment be to adopt the mode of continuous-current excitation to produce.Take the insulating performance of cable test as example, can be regarded as the capacitive electrical equipment, its basic test test principle as shown in Figure 1.Mainly, by DC charging power supply DC, current-limiting resistance R, the equivalent capacity C of inductance L, damping resistance RP, tested electrical equipment and electronic switch k form.Before electronic switch k closure, direct supply DC is by current-limiting resistance R, damping resistance RP and inductance L are charged to cable equivalent capacity C, when C is charged to scheduled voltage, rapid closing electronic switch k, form series loop by electronic switch, inductance L, damping resistance RP and C and produce a wave of oscillation f (t) of decay gradually, this wave of oscillation directly is added on the equivalent capacity C of electrical equipment, and the voltage signal of measuring on equivalent capacity C just can be realized sinusoidal wave withstand voltage test and the partial discharge quantity to tested cable (or electrical equipment).
The outstanding feature that adopts continuous-current excitation to obtain the wave of oscillation is simple.But, because the peak-peak of the first wave of oscillation f (t) equals the magnitude of voltage of DC charging power supply DC, when the voltage that requires test oscillation ripple f (t) is very high, the voltage of DC charging power supply DC also will correspondingly be mentioned very high, when specific implementation, the cost of components and parts, volume and the element controling circuit section complex that can become.Therefore, improve the trial voltage grade and become difficult.
Problem based on above-mentioned existence, adopt the mode of continuous-current excitation to obtain the wave of oscillation, due to cost and technology, can only accomplish at present the apparatus for generating oscillating wave that 200kV is following.Patent 200810124755.7 is introduced the German SEBAKMT OWTSHV150 of company type Partial Discharge Detection also can only accomplish 150kV with the trial voltage of continuous-current excitation apparatus for generating oscillating wave, up to 6,000,000 Renminbi, very expensive in the Chinese market sale price.
Up to now, both at home and abroad so far also not higher than the 250kV apparatus for generating oscillating wave of 1000kV even, quick propelling along with urbanization process, requirement to the line voltage grade is also more and more higher, how to improve the electric pressure for the apparatus for generating oscillating wave of local discharge of electrical equipment test use, become electric power and detect department's problem in the urgent need to address.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of apparatus for generating oscillating wave and method of adjustable DC excitation is provided, this device and method can produce the high-voltage test wave of oscillation by continuous-current excitation power supply and the electronic switch of low-voltage.
For achieving the above object; apparatus for generating oscillating wave for local discharge of electrical equipment test of the present invention comprises the first switches set, second switch group, the 5th switch, the power supply of exportable continuous-current excitation voltage, damping resistance and LC oscillatory circuit that resistance is adjustable; described the first switches set comprises the first switch and the 4th switch, and the second switch group comprises second switch and the 3rd switch;
Parallel with one another between the series circuit that the series circuit that described the first switch and second switch form, the 3rd switch and the 4th switch form and power supply; The first switch is connected with an end of the 5th switch with the circuit between second switch, and the 3rd switch is connected with the other end of the 5th switch with the circuit between the 4th switch;
When tested electrical equipment is inductive load, described LC oscillatory circuit comprises tested electrical equipment and electric capacity, after damping resistance, electric capacity and tested electrical equipment are connected in series successively, with the 5th switch in parallel, is connected;
When tested electrical equipment is capacitive load, described LC oscillatory circuit comprises tested electrical equipment and inductance, after damping resistance, inductance and tested electrical equipment are connected in series successively, with the 5th switch in parallel, is connected.
When tested electrical equipment is inductive load, the capability value of described electric capacity requires according to the quality factor q that meets the LC resonant circuit and the electric current of LC resonant circuit is less than the 5th switch rated operational current and selects;
When tested electrical equipment is capacitive load, the induction reactance value of described inductance requires according to the quality factor q that meets the LC resonant circuit and the electric current of LC resonant circuit is less than the 5th switch rated operational current and selects.
Described power supply comprises be connected with civil power thyristor, driving circuit and single-chip microcomputer, and single-chip microcomputer is controlled thyristor by driving circuit civil power is converted to and can regulates direct voltage source.
Described the first switch, second switch, the 3rd switch, the 4th switch are IGBT, and the control end of the first switch, second switch, the 3rd switch, the 4th switch all is connected with single-chip microcomputer.
Described the 5th switch is provided with two one-way SCRs, and described two one-way SCR reverse parallel connections connect, and the control end of two one-way SCRs is connected with single-chip microcomputer.
Accordingly, the present invention also provides a kind of wave of oscillation production method for the local discharge of electrical equipment test.
When tested electrical equipment is inductive load, comprise the following steps:
1) disconnect the 5th switch, and closed the first switches set or closed second switch group, be that the LC oscillatory circuit applies continuous-current excitation voltage V by power supply, and measure the response process of LC oscillatory circuit;
2) when t=tp, according to
Can obtain the damping ratio ξ of LC oscillatory circuit, again basis
can obtain the resonance angular frequency ω of LC oscillatory circuit
n, wherein, tp is LC oscillatory circuit time used while reaching first peak value, the overshoot that σ is the LC oscillatory circuit;
3) according to f=ω
n/ 2 π, cycle T=1/f and
obtain the inductance value L of tested electrical equipment, then basis
obtain the quality factor q of LC oscillatory circuit, the resistance value that wherein R is damping resistance, the capacitance that C is electric capacity;
4) when the quality factor q of LC oscillation circuit does not meet the voltage request of local discharge of electrical equipment test, adjust the resistance value of damping resistance, and repeating step 1), 2), 3), until the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, when the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, adjust the continuous-current excitation voltage V of power supply output, make the measurement trial voltage Vs that is applied to tested electrical equipment two ends meet Vs=1.273 * Q * V, and then take cycle T=1/ (2f) and be alternately closed the first switches set and second switch group as the time interval, make the LC oscillatory circuit produce the resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, simultaneously closed the 5th switch, can on tested electrical equipment, obtain the wave of oscillation for the local discharge of electrical equipment test.
When tested electrical equipment is capacitive load, comprise the following steps:
A) disconnect the 5th switch, and closed the first switches set or closed second switch group, be that the LC oscillatory circuit applies continuous-current excitation voltage V by power supply, and measure the response process of LC oscillatory circuit;
B) when t=tp, according to formula
Can obtain the damping ratio ξ of LC oscillatory circuit, again basis
can obtain the resonance angular frequency ω of LC oscillatory circuit
n, wherein, tp is LC oscillatory circuit time used while reaching first peak value, the overshoot that σ is the LC oscillatory circuit;
C) according to f=ω
n/ 2 π, cycle T=1/f and
obtain the capacitance C of tested electrical equipment, then basis
obtain the quality factor q of LC oscillatory circuit, wherein, the resistance value that R is damping resistance, the inductance value that L is inductance;
D) when the quality factor q of LC oscillatory circuit does not meet the voltage request of local discharge of electrical equipment test, adjust the resistance value of damping resistance, and repeating step a), b), c), until the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, when the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, adjust the continuous-current excitation voltage V of power supply output, make the measurement trial voltage Vs that is applied to tested electrical equipment two ends meet Vs=1.273 * Q * V, and then take cycle T=1/ (2f) and be alternately closed the first switches set and second switch group as the time interval, make the LC oscillatory circuit produce the resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, simultaneously closed the 5th switch, can on tested electrical equipment, survey the wave of oscillation obtained for the local discharge of electrical equipment test.
Step 4) and steps d) in the quality factor q of LC oscillatory circuit be 100 o'clock, the quality factor of LC oscillatory circuit meet the voltage request of local discharge of electrical equipment test.
The present invention has following beneficial effect:
Apparatus for generating oscillating wave for the local discharge of electrical equipment test of the present invention and method adopt the lower power supply of continuous-current excitation voltage, by the first switches set, the second switch group, damping resistance and LC oscillatory circuit obtain the resonance high voltage of local discharge of electrical equipment test use, concrete, obtain the quality factor q of LC oscillatory circuit according to the electrotechnics principle, by regulating the adjustable damping resistance of resistance, make the quality factor q of LC oscillatory circuit meet the voltage request of local discharge of electrical equipment test simultaneously, again by after being alternately closed the first switches set and second switch group and obtaining stable resonance high voltage, and then open the first switches set and second switch group, and closed the 5th switch, can on tested electrical equipment, obtain the wave of oscillation for the local discharge of electrical equipment test, in whole operating process, because the magnitude of voltage of the continuous-current excitation voltage of power supply output is low, thereby greatly reduce conversion the first switches set, the operating voltage of second switch group and the 5th switch, also simplified the design of excitation power supply.
The accompanying drawing explanation
Fig. 1 is traditional apparatus for generating oscillating wave for the local discharge of electrical equipment test and the schematic diagram of method;
Fig. 2 is when tested electrical equipment is capacitive load, schematic diagram of the present invention;
Fig. 3 is when tested electrical equipment is inductive load, schematic diagram of the present invention;
The response diagram that Fig. 4 is LC oscillatory circuit in the present invention;
The structural representation that Fig. 5 is embodiments of the invention one;
Fig. 6 makees to electrical equipment the application schematic diagram that local discharge capacity is measured in embodiment mono-.
Wherein, K1 is that the first switch, K2 are that second switch, K3 are that the 3rd switch, K4 are that the 4th switch, K5 are that the 5th switch, DC are that power supply, L1 are that inductance, C1 are that electric capacity, RP are damping resistance.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 2 and Fig. 3, the figure on the left side in Fig. 2 and Fig. 3 is circuit theory diagrams of the present invention, the response diagram that the figure on the right is LC oscillatory circuit in schematic diagram.Apparatus for generating oscillating wave for local discharge of electrical equipment test of the present invention comprises the first switches set, second switch group, the 5th K switch 5, the power supply DC of exportable continuous-current excitation voltage, damping resistance RP and LC oscillatory circuit that resistance is adjustable; described the first switches set comprises the first K switch 1 and the 4th K switch 4, and the second switch group comprises second switch K2 and the 3rd K switch 3; Described power supply DC comprises be connected with civil power thyristor, driving circuit and single-chip microcomputer, and single-chip microcomputer is controlled thyristor by driving circuit civil power is converted to and can regulates direct voltage source.Described the 5th K switch 5 is provided with two one-way SCRs, and described two one-way SCR reverse parallel connections connect, and the control end of two one-way SCRs is connected with single-chip microcomputer.
Parallel with one another between the series circuit that the series circuit that described the first K switch 1 and second switch K2 form, the 3rd K switch 3 and the 4th K switch 4 form and power supply DC; The first K switch 1 is connected with an end of the 5th K switch 5 with the circuit between second switch K2, the 3rd K switch 3 is connected with the other end of the 5th K switch 5 with the circuit between the 4th K switch 4, the IGBT that described the first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4 are, the control end of the first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4 all is connected with single-chip microcomputer.
When tested electrical equipment is inductive load, described LC oscillatory circuit comprises tested electrical equipment and capacitor C 1, after damping resistance RP, capacitor C 1 and tested electrical equipment are connected in series successively, be connected in parallel with the 5th K switch 5, the capability value of described capacitor C 1 requires according to the quality factor q that meets the LC resonant circuit and the electric current of LC resonant circuit is less than the 5th switch rated operational current and selects.
When tested electrical equipment is capacitive load, described LC oscillatory circuit comprises tested electrical equipment and inductance L 1, after damping resistance RP, inductance L 1 and tested electrical equipment are connected in series successively, be connected in parallel with the 5th K switch 5, the induction reactance value of described inductance L 1 requires according to the quality factor q that meets the LC resonant circuit and the electric current of LC resonant circuit is less than the 5th switch rated operational current and selects.
The present invention also provides a kind of wave of oscillation production method for the local discharge of electrical equipment test, comprises following two kinds of situations:
When tested electrical equipment is inductive load, method of the present invention comprises the following steps:
1) disconnect the 5th K switch 5, and closed the first switches set or closed second switch group, be that the LC oscillatory circuit applies continuous-current excitation voltage V by power supply DC, and measure the response process of LC oscillatory circuit;
2) with reference to figure 4, when t=tp, according to
Can obtain the damping ratio ξ of LC oscillatory circuit, then basis
can obtain the resonance angular frequency ω of LC oscillatory circuit
n, wherein, tp is LC oscillatory circuit time used while reaching first peak value, the overshoot that σ is the LC oscillatory circuit;
3) according to f=ω
n/ 2 π, cycle T=1/f and
obtain the inductance value L of tested electrical equipment, then basis
obtain the quality factor q of LC oscillatory circuit, the resistance value that wherein R is damping resistance RP, the capacitance that C is capacitor C 1;
4) when the quality factor q of LC oscillation circuit does not meet the voltage request of local discharge of electrical equipment test, adjust the resistance value of damping resistance RP, and repeating step 1), 2), 3), until the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, wherein the quality factor q of LC oscillatory circuit is 100 o'clock, the quality factor of LC oscillatory circuit meet the voltage request of local discharge of electrical equipment test, when the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, adjust the continuous-current excitation voltage V of power supply DC output, make the measurement trial voltage Vs that is applied to tested electrical equipment two ends meet Vs=1.273 * Q * V, and then take cycle T=1/ (2f) and be alternately closed the first switches set and second switch group as the time interval, make the LC oscillatory circuit produce the resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, simultaneously closed the 5th K switch 5, can on tested electrical equipment, obtain the wave of oscillation for the local discharge of electrical equipment test.
When tested electrical equipment is capacitive load, comprise the following steps:
A) disconnect the 5th K switch 5, and closed the first switches set or closed second switch group, be that the LC oscillatory circuit applies continuous-current excitation voltage V by power supply DC, and measure the response process of LC oscillatory circuit;
B) with reference to figure 4, when t=tp, according to
Can obtain the damping ratio ξ of LC oscillatory circuit, according to
can obtain the resonance angular frequency ω of LC oscillatory circuit
n, wherein, tp is LC oscillatory circuit time used while reaching first peak value, the overshoot that σ is the LC oscillatory circuit;
C) according to f=ω
n/ 2 π, cycle T=1/f and
obtain the capacitance C of tested electrical equipment, then basis
obtain the quality factor q of LC oscillatory circuit, wherein, the resistance value that R is damping resistance RP, the inductance value that L is inductance L 1;
D) when the quality factor q of LC oscillatory circuit does not meet the voltage request of local discharge of electrical equipment test, adjust the resistance value of damping resistance RP, and repeating step a), b), c), until the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, wherein, the quality factor q of LC oscillatory circuit is 100 o'clock, the quality factor of LC oscillatory circuit meet the voltage request of local discharge of electrical equipment test, when the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, adjust the continuous-current excitation voltage V of power supply DC output, make the measurement trial voltage Vs that is applied to tested electrical equipment two ends meet Vs=1.273 * Q * V, and then take cycle T=1/ (2f) and be alternately closed the first switches set and second switch group as the time interval, make the LC oscillatory circuit produce the resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, simultaneously closed the 5th K switch 5, can on tested electrical equipment, survey the wave of oscillation obtained for the local discharge of electrical equipment test.
The present invention adopts the power supply DC that continuous-current excitation voltage is lower, by the resonance acquisition test resonance high voltage of the first switches set, second switch group and LC series loop.According to the electrotechnics principle, the size of this measurement trial voltage Vs is approximately Symmetrical continuous-current excitation supply voltage V's
doubly, i.e. Vs=1.273QV.Wherein
for the quality factor of RLC series resonant tank, damping resistance RP adopts variable resistor, and the convenient Q value of adjusting, to obtain the trial voltage needed.Because the voltage of power supply DC output is lower, also can be lower so change the operating voltage of the first switches set and second switch group.
Embodiment mono-
With reference to figure 5, in the present embodiment, tested electrical equipment is capacitive load, power supply DC meets filter capacitor C1 after comprising three phase full bridge controlled rectification circuit that rectification thyristor Q1～Q6 forms, rectification, H bridge voltage commutation loop is comprised of interior band fly-wheel diode IGBT, and driver element circuit DR1～DR2 of IGBT is controlled by single-chip microprocessor MCU.
With reference to figure 6, in use, the local discharge signal lotus root is closed sensor CG and is connected in the loop of tested electrical equipment C, the local discharge signal of CG output is given the input end of measurement of partial discharge instrument single-chip microprocessor MCU, it is synchronizeed with the k5 short circuit trigger pip of MCU port one 0～11, this signal controlling shelf depreciation instrument is when the wave of oscillation starts, gather and record local discharge signal, as long as equipment under test C goes forward, the amplitude of 3～10 wave of oscillation voltages meets the technical manual of measurement of partial discharge, to the local discharge signal collection, record and analysis, just can calculate the size of the partial discharge quantity of this electrical equipment C, so as to weighing the state of insulation of this electrical equipment of judgement.
For comprising the electrical equipments such as power cable, gas-insulated combined electric GIS, power transformer and generator, can utilize the device the present invention relates to carry out the withstand voltage and partial discharge quantity of sine wave and measure; When adjustment test element parameter makes Q=100, the DC voltage that the wave of oscillation of apparatus of the present invention generation 5000kV needs is 39.3kV, and the existing components and parts ratio of this electric pressure is easier to realization, and this shows that apparatus of the present invention can produce 1kV～5000kV trial voltage.
Claims (7)
1. the apparatus for generating oscillating wave for local discharge of electrical equipment test, it is characterized in that, comprise the power supply (DC) of the first switches set, second switch group, the 5th switch (K5), exportable continuous-current excitation voltage, damping resistance (RP) and the LC oscillatory circuit that resistance is adjustable, described the first switches set comprises the first switch (K1) and the 4th switch (K4), and the second switch group comprises second switch (K2) and the 3rd switch (K3);
Parallel with one another between the series circuit that the series circuit that described the first switch (K1) and second switch (K2) form, the 3rd switch (K3) and the 4th switch (K4) form and power supply (DC); The first switch (K1) is connected with an end of the 5th switch (K5) with the circuit between second switch (K2), and the 3rd switch (K3) is connected with the other end of the 5th switch (K5) with the circuit between the 4th switch (K4);
When tested electrical equipment is inductive load, described LC oscillatory circuit comprises tested electrical equipment and electric capacity (C1), after damping resistance (RP), electric capacity (C1) and tested electrical equipment are connected in series successively, with the 5th switch (K5), is connected in parallel;
When tested electrical equipment is capacitive load, described LC oscillatory circuit comprises tested electrical equipment and inductance (L1), after damping resistance (RP), inductance (L1) and tested electrical equipment are connected in series successively, with the 5th switch (K5), is connected in parallel.
2. the apparatus for generating oscillating wave for the local discharge of electrical equipment test according to claim 1, is characterized in that,
When tested electrical equipment is inductive load, the capability value of described electric capacity (C1) requires according to the quality factor q that meets the LC resonant circuit and the electric current of LC resonant circuit is less than the 5th switch rated operational current and selects;
When tested electrical equipment is capacitive load, the induction reactance value of described inductance (L1) requires according to the quality factor q that meets the LC resonant circuit and the electric current of LC resonant circuit is less than the 5th switch rated operational current and selects.
3. the apparatus for generating oscillating wave for local discharge of electrical equipment test according to claim 1, it is characterized in that, described power supply (DC) comprises be connected with civil power thyristor, driving circuit and single-chip microcomputer, and single-chip microcomputer is controlled thyristor by driving circuit civil power is converted to and can regulates direct voltage source.
4. the apparatus for generating oscillating wave for local discharge of electrical equipment test according to claim 3, it is characterized in that, described the first switch (K1), second switch (K2), the 3rd switch (K3), the 4th switch (K4) are IGBT, and the control end of the first switch (K1), second switch (K2), the 3rd switch (K3), the 4th switch (K4) all is connected with single-chip microcomputer.
5. according to the described apparatus for generating oscillating wave for the local discharge of electrical equipment test of claim 3 or 4, it is characterized in that, described the 5th switch (K5) is provided with two one-way SCRs, described two one-way SCR reverse parallel connections connect, and the control end of two one-way SCRs is connected with single-chip microcomputer.
6. the wave of oscillation production method for the local discharge of electrical equipment test, based on device claimed in claim 1, is characterized in that,
When tested electrical equipment is inductive load, comprise the following steps:
1) disconnect the 5th switch (K5), and closed the first switches set or closed second switch group, apply continuous-current excitation voltage V by power supply (DC) for the LC oscillatory circuit, and measure the response process of LC oscillatory circuit;
2) when t=tp, according to
can obtain the damping ratio ξ of LC oscillatory circuit, again basis
can obtain the resonance angular frequency ω of LC oscillatory circuit
n, wherein, tp is LC oscillatory circuit time used while reaching first peak value, the overshoot that σ is the LC oscillatory circuit;
3) according to f=ω
n/ 2 π, cycle T=1/f and
obtain the inductance value L of tested electrical equipment, then basis
obtain the quality factor q of LC oscillatory circuit, the resistance value that wherein R is damping resistance (RP), the capacitance that C is electric capacity (C1);
4) when the quality factor q of LC oscillation circuit does not meet the voltage request of local discharge of electrical equipment test, adjust the resistance value of damping resistance (RP), and repetition step 1), 2), 3), until the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, when the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, adjust the continuous-current excitation voltage V of power supply (DC) output, make the measurement trial voltage Vs that is applied to tested electrical equipment two ends meet Vs=1.273 * Q * V, and then take cycle T=1/ (2f) and be alternately closed the first switches set and second switch group as the time interval, make the LC oscillatory circuit produce the resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, simultaneously closed the 5th switch (K5), can on tested electrical equipment, obtain the wave of oscillation for the local discharge of electrical equipment test,
When tested electrical equipment is capacitive load, comprise the following steps:
A) disconnect the 5th switch (K5), and closed the first switches set or closed second switch group, apply continuous-current excitation voltage V by power supply (DC) for the LC oscillatory circuit, and measure the response process of LC oscillatory circuit;
B) when t=tp, according to formula
can obtain the damping ratio ξ of LC oscillatory circuit, again basis
can obtain the resonance angular frequency ω of LC oscillatory circuit
n, wherein, tp is LC oscillatory circuit time used while reaching first peak value, the overshoot that σ is the LC oscillatory circuit;
C) according to f=ω
n/ 2 π, cycle T=1/f and
obtain the capacitance C of tested electrical equipment, then basis
obtain the quality factor q of LC oscillatory circuit, wherein, the resistance value that R is damping resistance (RP), the inductance value that L is inductance (L1);
D) when the quality factor q of LC oscillatory circuit does not meet the voltage request of local discharge of electrical equipment test, adjust the resistance value of damping resistance (RP), and repetition step a), b), c), until the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, when the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, adjust the continuous-current excitation voltage V of power supply (DC) output, make the measurement trial voltage Vs that is applied to tested electrical equipment two ends meet Vs=1.273 * Q * V, and then take cycle T=1/ (2f) and be alternately closed the first switches set and second switch group as the time interval, make the LC oscillatory circuit produce the resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, simultaneously closed the 5th switch (K5), can on tested electrical equipment, survey the wave of oscillation obtained for the local discharge of electrical equipment test.
7. the wave of oscillation production method for the local discharge of electrical equipment test according to claim 1, is characterized in that,
In step 4) and step d), the quality factor q of LC oscillatory circuit is 100 o'clock, and the quality factor of LC oscillatory circuit meet the voltage request of local discharge of electrical equipment test.
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| CN110703063A (en) * | 2019-11-26 | 2020-01-17 | 国网黑龙江省电力有限公司电力科学研究院 | Ultralow frequency and oscillatory wave two-in-one partial discharge-free cable performance detection device |
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