CN103439637B - A kind of wave of oscillation production method for local discharge of electrical equipment test - Google Patents
A kind of wave of oscillation production method for local discharge of electrical equipment test Download PDFInfo
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- CN103439637B CN103439637B CN201310353549.4A CN201310353549A CN103439637B CN 103439637 B CN103439637 B CN 103439637B CN 201310353549 A CN201310353549 A CN 201310353549A CN 103439637 B CN103439637 B CN 103439637B
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Abstract
The invention provides a kind of wave of oscillation production method for local discharge of electrical equipment test, comprise the first switches set, second switch group, the 5th switch, power supply, damping resistance that resistance is adjustable and LC oscillatory circuit, first switches set comprises the first switch and the 4th switch, and second switch group comprises second switch and the 3rd switch; Parallel with one anotherly between the series circuit that the series circuit that first switch forms with second switch, the 3rd switch and the 4th switch form and power supply to be connected; First switch is connected with the one end with the 5th switch of the circuit between second switch, and the circuit between the 3rd switch with the 4th switch is connected with the other end of the 5th switch; Be connected with the 5th switch in parallel after LC oscillatory circuit and damping resistance are connected in series.The present invention can produce the high-voltage test wave of oscillation by the continuous-current excitation power supply of low-voltage and electronic switch.
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 wave of oscillation production method for 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 test.But when test specimen equivalent electric capacity is very large and its trial voltage is very high, can be very large by the capacity of testing transformer load test voltage, cause scene to complete test, this simple and easy to do method was lost efficacy.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, the wave of oscillation equipment both at home and abroad for detecting adopts the mode of continuous-current excitation to produce.For insulating performance of cable test, can be regarded as capacitive electrical equipment, its basic test test principle as shown in Figure 1.Primarily of 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 forms.Before electronic switch k is closed, 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, formed series loop produced wave of oscillation f (t) of decaying gradually by electronic switch, inductance L, damping resistance RP and C, this wave of oscillation is directly added on the equivalent capacity C of electrical equipment, and the voltage signal measured on equivalent capacity C just can realize sinusoidal wave withstand voltage test to tested cable (or electrical equipment) and partial discharge quantity.
The outstanding feature adopting continuous-current excitation to obtain the wave of oscillation is simple.But, peak-peak due to first wave of oscillation f (t) equals the magnitude of voltage of DC charging power supply DC, when requiring the voltage of test oscillation ripple f (t) 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 element controling circuit all can become complex.Therefore, improve trial voltage grade and become difficulty.
Based on above-mentioned Problems existing, adopt the mode of continuous-current excitation to obtain the wave of oscillation, due to cost and technology, the apparatus for generating oscillating wave of below 200kV can only be accomplished at present.The trial voltage that patent 200810124755.7 introduces German SEBAKMT company OWTSHV150 type Partial Discharge Detection continuous-current excitation apparatus for generating oscillating wave also can only accomplish 150kV, in Chinese market sale price up to 6,000,000 Renminbi, very expensive.
Up to now, both at home and abroad so far also not higher than the 250kV even apparatus for generating oscillating wave of 1000kV, along with the quick propelling of urbanization process, also more and more higher to the requirement of line voltage grade, how to improve the electric pressure of the apparatus for generating oscillating wave for local discharge of electrical equipment test, 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 the shortcoming overcoming above-mentioned prior art, provide a kind of wave of oscillation production method for local discharge of electrical equipment test, the method can produce the high-voltage test wave of oscillation by the continuous-current excitation power supply of low-voltage and electronic switch.
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 direct energizing voltages, damping resistance that resistance is adjustable and LC oscillatory circuit, described first switches set comprises the first switch and the 4th switch, and second switch group comprises second switch and the 3rd switch;
Parallel with one another between the series circuit that the series circuit that described first switch and second switch form, the 3rd switch and the 4th switch form and power supply; First switch is connected with the one end with the 5th switch of the circuit between second switch, and the circuit between the 3rd switch with the 4th switch is connected with the other end of the 5th switch;
When tested electrical equipment is inductive load, described LC oscillatory circuit comprises tested electrical equipment and electric capacity, is connected after damping resistance, electric capacity and tested electrical equipment are sequentially connected in series with the 5th switch in parallel;
When tested electrical equipment is capacitive load, described LC oscillatory circuit comprises tested electrical equipment and inductance, is connected after damping resistance, inductance and tested electrical equipment are sequentially connected in series with the 5th switch in parallel.
When tested electrical equipment is inductive load, the capability value of described electric capacity requires according to the quality factor q meeting 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 meeting 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 to be connected with civil power thyristor, driving circuit and single-chip microcomputer, and single-chip microcomputer controls thyristor by driving circuit and civil power is converted to adjustable direct voltage source.
Described 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 is all connected with single-chip microcomputer.
Described 5th switch is provided with two one-way SCRs, and described two one-way SCRs are connected in antiparallel, and the control end of two one-way SCRs is connected with single-chip microcomputer.
Wave of oscillation production method for local discharge of electrical equipment test of the present invention.
When tested electrical equipment is inductive load, comprise the following steps:
1) the 5th switch is disconnected, and closed first switches set or closed second switch group, be that LC oscillatory circuit applies direct energizing voltages V by power supply, and measure the response process of LC oscillatory circuit;
2) as t=tp, according to
the damping ratio ξ of LC oscillatory circuit can be obtained, again basis
the resonance angular frequency ω of LC oscillatory circuit can be obtained
n, wherein, tp is LC oscillatory circuit time used when reaching first peak value, and σ is the overshoot of 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, wherein R is the resistance value of damping resistance, and C is the capacitance of 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, the resistance value of adjustment damping resistance, and repeat step 1), 2), 3), till 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, the direct energizing voltages V that adjustment power supply exports, the measurement trial voltage Vs being applied to tested electrical equipment two ends is made to meet Vs=1.273 × Q × V, and then with cycle T=1/ (2f) for the time interval is alternately closed the first switches set and second switch group, LC oscillatory circuit is made to produce resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, closed 5th switch simultaneously, the wave of oscillation being used for local discharge of electrical equipment test can be obtained on tested electrical equipment.
When tested electrical equipment is capacitive load, comprise the following steps:
A) the 5th switch is disconnected, and closed first switches set or closed second switch group, be that LC oscillatory circuit applies direct energizing voltages V by power supply, and measure the response process of LC oscillatory circuit;
B) as t=tp, according to formula
the damping ratio ξ of LC oscillatory circuit can be obtained, again basis
the resonance angular frequency ω of LC oscillatory circuit can be obtained
n, wherein, tp is LC oscillatory circuit time used when reaching first peak value, and σ is the overshoot of 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, R is the resistance value of damping resistance, and L is the inductance value of inductance;
D) when the quality factor q of LC oscillatory circuit does not meet the voltage request of local discharge of electrical equipment test, the resistance value of adjustment damping resistance, and repeat step a), b), c), till 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, the direct energizing voltages V that adjustment power supply exports, the measurement trial voltage Vs being applied to tested electrical equipment two ends is made to meet Vs=1.273 × Q × V, and then with cycle T=1/ (2f) for the time interval is alternately closed the first switches set and second switch group, LC oscillatory circuit is made to produce resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, closed 5th switch simultaneously, the wave of oscillation obtaining and be used for local discharge of electrical equipment test can be surveyed on tested electrical equipment.
Step 4) and steps d) in the quality factor q of LC oscillatory circuit when being 100, 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:
Wave of oscillation production method for local discharge of electrical equipment test of the present invention adopts the power supply that direct energizing voltages is lower, by the first switches set, second switch group, damping resistance and LC oscillatory circuit obtain the resonance high voltage of local discharge of electrical equipment test, concrete, the quality factor q of LC oscillatory circuit is obtained according to electrotechnics principle, simultaneously by regulating the adjustable damping resistance of resistance to make the quality factor q of LC oscillatory circuit meet the voltage request of local discharge of electrical equipment test, 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 5th switch, the wave of oscillation for local discharge of electrical equipment test can be obtained on tested electrical equipment, in whole operating process, because the magnitude of voltage of the direct energizing voltages of power supply output is low, thus greatly reduce conversion first switches set, the operating voltage of second switch group and the 5th switch, also simplify the design of excitation power supply.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of traditional wave of oscillation production method for local discharge of electrical equipment test;
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;
Fig. 4 is the response diagram of LC oscillatory circuit in the present invention;
Fig. 5 is the structural representation of embodiments of the invention one;
Fig. 6 is the application schematic diagram in embodiment one, electrical equipment being done to partial discharge quantity measurement.
Wherein, K1 is the first switch, K2 is second switch, K3 is the 3rd switch, K4 is the 4th switch, K5 is the 5th switch, DC is power supply, L1 is inductance, C1 is electric capacity, RP is damping resistance.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Figure with reference to the left side in figure 2 and Fig. 3, Fig. 2 and Fig. 3 is circuit theory diagrams of the present invention, and the figure on the right is the response diagram of 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 direct energizing voltages, damping resistance RP that resistance is adjustable and LC oscillatory circuit, described first switches set comprises the first K switch 1 and the 4th K switch 4, and second switch group comprises second switch K2 and the 3rd K switch 3; Described power supply DC comprises to be connected with civil power thyristor, driving circuit and single-chip microcomputer, and single-chip microcomputer controls thyristor by driving circuit and civil power is converted to adjustable direct voltage source.Described 5th K switch 5 is provided with two one-way SCRs, and described two one-way SCRs are connected in antiparallel, 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 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; First K switch 1 is connected with the one end with the 5th K switch 5 of the circuit between second switch K2, circuit between 3rd K switch 3 with the 4th K switch 4 is connected with the other end of the 5th K switch 5, the IGBT that described 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 is all connected with single-chip microcomputer.
When tested electrical equipment is inductive load, described LC oscillatory circuit comprises tested electrical equipment and electric capacity C1, be connected in parallel with the 5th K switch 5 after damping resistance RP, electric capacity C1 and tested electrical equipment are sequentially connected in series, the capability value of described electric capacity C1 requires according to the quality factor q meeting 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, be connected in parallel with the 5th K switch 5 after damping resistance RP, inductance L 1 and tested electrical equipment are sequentially connected in series, the induction reactance value of described inductance L 1 requires according to the quality factor q meeting LC resonant circuit and the electric current of LC resonant circuit is less than the 5th switch rated operational current and selects.
Wave of oscillation production method for local discharge of electrical equipment test of the present invention, comprises following two kinds of situations:
When tested electrical equipment is inductive load, method of the present invention comprises the following steps:
1) the 5th K switch 5 is disconnected, and closed first switches set or closed second switch group, be that LC oscillatory circuit applies direct energizing voltages V by power supply DC, and measure the response process of LC oscillatory circuit;
2) with reference to figure 4, as t=tp, according to
the damping ratio ξ of LC oscillatory circuit can be obtained, then basis
the resonance angular frequency ω of LC oscillatory circuit can be obtained
n, wherein, tp is LC oscillatory circuit time used when reaching first peak value, and σ is the overshoot of 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, wherein R is the resistance value of damping resistance RP, and C is the capacitance of 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, the resistance value of adjustment damping resistance RP, and repeat step 1), 2), 3), till the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, when wherein the quality factor q of LC oscillatory circuit is 100, 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, the direct energizing voltages V that adjustment power supply DC exports, the measurement trial voltage Vs being applied to tested electrical equipment two ends is made to meet Vs=1.273 × Q × V, and then with cycle T=1/ (2f) for the time interval is alternately closed the first switches set and second switch group, LC oscillatory circuit is made to produce resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, closed 5th K switch 5 simultaneously, the wave of oscillation being used for local discharge of electrical equipment test can be obtained on tested electrical equipment.
When tested electrical equipment is capacitive load, comprise the following steps:
A) the 5th K switch 5 is disconnected, and closed first switches set or closed second switch group, be that LC oscillatory circuit applies direct energizing voltages V by power supply DC, and measure the response process of LC oscillatory circuit;
B) with reference to figure 4, as t=tp, according to
the damping ratio ξ of LC oscillatory circuit can be obtained, according to
the resonance angular frequency ω of LC oscillatory circuit can be obtained
n, wherein, tp is LC oscillatory circuit time used when reaching first peak value, and σ is the overshoot of 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, R is the resistance value of damping resistance RP, and L is the inductance value of 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, the resistance value of adjustment damping resistance RP, and repeat step a), b), c), till the quality factor q of LC oscillatory circuit meets the voltage of local discharge of electrical equipment test, wherein, when the quality factor q of LC oscillatory circuit is 100, 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, the direct energizing voltages V that adjustment power supply DC exports, the measurement trial voltage Vs being applied to tested electrical equipment two ends is made to meet Vs=1.273 × Q × V, and then with cycle T=1/ (2f) for the time interval is alternately closed the first switches set and second switch group, LC oscillatory circuit is made to produce resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, closed 5th K switch 5 simultaneously, the wave of oscillation obtaining and be used for local discharge of electrical equipment test can be surveyed on tested electrical equipment.
The power supply DC that the present invention adopts direct energizing voltages lower, obtains test resonance high voltage by the resonance of the first switches set, second switch group and LC series loop.According to 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 convenient adjustment Q value, to obtain the trial voltage of needs.The voltage exported due to power supply DC is lower, so the operating voltage of conversion the first switches set and second switch group also can be lower.
Embodiment one
With reference to figure 5, in the present embodiment, tested electrical equipment is capacitive load, power supply DC comprises three phase full bridge controlled rectification circuit that rectification thyristor Q1 ~ Q6 forms, meets filter capacitor C1 after rectification, H bridge voltage commutation loop is made up of interior band fly-wheel diode IGBT, and the driver element circuit DR1 ~ DR2 of IGBT is controlled by single-chip microprocessor MCU.
With reference to figure 6, in using, local discharge signal lotus root is closed sensor CG and is connected in the loop of tested electrical equipment C, the local discharge signal that CG exports gives the input end of measurement of partial discharge instrument single-chip microprocessor MCU, it is synchronous with the k5 short circuit trigger pip of MCU port one 0 ~ 11, this signal controls local discharge 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 oscillating wave voltage meets the technical manual of measurement of partial discharge, to 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 judging this electrical equipment.
For comprising the electrical equipments such as power cable, gas-insulated combined electric GIS, power transformer and generator, the device that the present invention relates to can be utilized to carry out the withstand voltage and partial discharge quantity of sine wave and to measure; When Adjustment Tests component parameters makes Q=100, the DC voltage that the wave of oscillation that apparatus of the present invention produce 5000kV needs is 39.3kV, and the existing components and parts ratio of this electric pressure is easier to realize, and this shows that apparatus of the present invention can produce 1kV ~ 5000kV trial voltage.
Claims (2)
1., for a wave of oscillation production method for local discharge of electrical equipment test, based on the apparatus for generating oscillating wave tested for local discharge of electrical equipment, it is characterized in that,
Apparatus for generating oscillating wave for local discharge of electrical equipment test comprises the first switches set, second switch group, the 5th switch (K5), the power supply (DC) of exportable direct energizing voltages, damping resistance (RP) that resistance is adjustable and LC oscillatory circuit, described first switches set comprises the first switch (K1) and the 4th switch (K4), and 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 first switch (K1) and second switch (K2) form, the 3rd switch (K3) and the 4th switch (K4) form and power supply (DC); Circuit between first switch (K1) with second switch (K2) is connected with one end of the 5th switch (K5), and the circuit between the 3rd switch (K3) with the 4th switch (K4) is connected with the other end of the 5th switch (K5);
When tested electrical equipment is inductive load, described LC oscillatory circuit comprises tested electrical equipment and electric capacity (C1), is connected in parallel after damping resistance (RP), electric capacity (C1) and tested electrical equipment are sequentially connected in series with the 5th switch (K5);
When tested electrical equipment is capacitive load, described LC oscillatory circuit comprises tested electrical equipment and inductance (L1), is connected in parallel after damping resistance (RP), inductance (L1) and tested electrical equipment are sequentially connected in series with the 5th switch (K5);
When tested electrical equipment is inductive load, comprise the following steps:
1) the 5th switch (K5) is disconnected, and closed first switches set or closed second switch group, by power supply (DC) for LC oscillatory circuit applies direct energizing voltages V, and measure the response process of LC oscillatory circuit;
2) as t=tp, according to
the damping ratio ξ of LC oscillatory circuit can be obtained, again basis
the resonance angular frequency ω of LC oscillatory circuit can be obtained
n, wherein, tp is LC oscillatory circuit time used when reaching first peak value, and σ is the overshoot of 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, wherein R is the resistance value of damping resistance (RP), and C is the capacitance of 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, the resistance value of adjustment damping resistance (RP), and repeat step 1), 2), 3), till 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, the direct energizing voltages V that adjustment power supply (DC) exports, the measurement trial voltage Vs being applied to tested electrical equipment two ends is made to meet Vs=1.273 × Q × V, and then with cycle T=1/ (2f) for the time interval is alternately closed the first switches set and second switch group, LC oscillatory circuit is made to produce resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, closed 5th switch (K5) simultaneously, the wave of oscillation being used for local discharge of electrical equipment test can be obtained on tested electrical equipment,
When tested electrical equipment is capacitive load, comprise the following steps:
A) the 5th switch (K5) is disconnected, and closed first switches set or closed second switch group, by power supply (DC) for LC oscillatory circuit applies direct energizing voltages V, and measure the response process of LC oscillatory circuit;
B) as t=tp, according to formula
the damping ratio ξ of LC oscillatory circuit can be obtained, again basis
the resonance angular frequency ω of LC oscillatory circuit can be obtained
n, wherein, tp is LC oscillatory circuit time used when reaching first peak value, and σ is the overshoot of 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, R is the resistance value of damping resistance (RP), and L is the inductance value of 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, the resistance value of adjustment damping resistance (RP), and repeat step a), b), c), till 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, the direct energizing voltages V that adjustment power supply (DC) exports, the measurement trial voltage Vs being applied to tested electrical equipment two ends is made to meet Vs=1.273 × Q × V, and then with cycle T=1/ (2f) for the time interval is alternately closed the first switches set and second switch group, LC oscillatory circuit is made to produce resonance high voltage, after described resonance high voltage reaches steady state (SS), disconnect the first switches set and second switch group, closed 5th switch (K5) simultaneously, the wave of oscillation obtaining and be used for local discharge of electrical equipment test can be surveyed on tested electrical equipment.
2. the wave of oscillation production method for local discharge of electrical equipment test according to claim 1, is characterized in that,
Step 4) and steps d) in the quality factor q of LC oscillatory circuit when being 100, 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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