CN111624452B - High-voltage generator for insulation test of distribution cable - Google Patents
High-voltage generator for insulation test of distribution cable Download PDFInfo
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- CN111624452B CN111624452B CN202010409405.6A CN202010409405A CN111624452B CN 111624452 B CN111624452 B CN 111624452B CN 202010409405 A CN202010409405 A CN 202010409405A CN 111624452 B CN111624452 B CN 111624452B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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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
- G01R31/16—Construction of testing vessels; Electrodes therefor
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- Ac-Ac Conversion (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides a high-voltage generator for insulation test of a distribution cable, which comprises a bidirectional controllable multistage voltage-multiplying circuit, a high-frequency transformer T, a high-frequency inverter circuit, a rectifying charging circuit, a voltage division feedback circuit, a filter circuit and a cable capacitor C 9 The high-frequency voltage-multiplying power supply comprises a voltage acquisition module, a current signal collector, a control and acquisition module, a rectification charging circuit, a high-frequency inverter circuit, a high-frequency transformer T, a voltage division feedback circuit, a bidirectional controllable multistage voltage-multiplying circuit, a filter circuit and a first resistor R, wherein the rectification charging circuit is connected with the high-frequency inverter circuit in parallel, the high-frequency inverter circuit and the bidirectional controllable multistage voltage-multiplying circuit are connected through the high-frequency transformer T, the voltage division feedback circuit is connected with the bidirectional controllable multistage voltage-multiplying circuit in parallel, and the filter circuit is sequentially connected in series with the first resistor R 7 And cable capacitance C 9 The rear part is connected in parallel with a voltage division feedback circuit, a voltage acquisition module and a cable capacitor C 9 Are connected in parallel. The invention utilizes the power frequency power supply to generate bipolar direct current voltage and ultralow frequency sinusoidal voltage, greatly reduces the test cost, has better expansibility and can be expanded to higher voltage level.
Description
Technical Field
The invention relates to the technical field of high-voltage generators, in particular to a high-voltage generator for insulation test of a distribution cable.
Background
With the economic development of China, the distribution cable gradually replaces an overhead line to become a main component of the urban distribution network at present, and various insulation defects and insulation degradation phenomena can occur on the distribution cable during operation due to the influences of factors such as uneven product quality, artificial damage in the installation process, operation environment and the like. The distribution cable has the largest laying base number and the highest fault rate, and is very necessary to carry out preventive insulation state testing on the distribution cable.
Most of the detection methods used at present adopt a direct current charging mode, and the technology used for the field test of the power cable is mainly from a direct current high-voltage power supply, and the cost of the direct current high-voltage power supply is high, so that the technology becomes a factor which most obstructs the reduction of the cost of the field detection equipment of the power cable.
Disclosure of Invention
The invention aims to overcome the defect that a direct-current high-voltage power supply is directly used in the test of a distribution cable, so that the test cost is high, and provides a high-voltage generator for the insulation test of the distribution cable. The invention utilizes the power frequency power supply to generate bipolar direct current voltage and ultralow frequency sinusoidal voltage, greatly reduces the test cost, has better expansibility and can be expanded to higher voltage level.
In order to solve the technical problems, the invention adopts the technical scheme that: a high-voltage generator for insulation test of distribution cable is composed of bidirectional controllable multi-stage voltage-multiplying circuit, high-frequency transformer T, high-frequency inverter circuit, rectifying and charging circuit, and branch circuitVoltage feedback circuit, filter circuit and cable capacitor C 9 Voltage acquisition module, current signal collector and first resistor R 7 And the control and acquisition module, the rectification charging circuit with high frequency inverter circuit parallel connection, high frequency inverter circuit with two-way controllable multistage voltage doubling circuit passes through high frequency transformer T and connects, two-way controllable multistage voltage doubling circuit comprises a plurality of two-way controllable voltage doubling circuit parallelly connected, partial pressure feedback circuit with two-way controllable multistage voltage doubling circuit parallel connection, filter circuit establishes ties in proper order first resistance R 7 And cable capacitance C 9 The rear part is connected in parallel to the voltage division feedback circuit, the voltage acquisition module and the cable capacitor C 9 Connected in parallel, the current signal collector and the first resistor R 7 And the voltage division branch feed circuit, the current signal collector and the voltage collection module are connected with the control and collection module in parallel. The rectification charging circuit and the high-frequency inverter circuit convert power frequency alternating current into high-frequency alternating current after rectification inversion, the high-frequency alternating current is boosted through the high-frequency transformer T, the boosted high-frequency alternating current generates high-voltage direct current with different polarities in the bidirectional controllable multistage voltage-multiplying circuit, the voltage division feedback circuit can measure the output voltage of the current bidirectional controllable multistage voltage-multiplying circuit in real time, and ultralow-frequency sinusoidal voltage can be generated according to the hysteresis loop comparison principle. The device is connected to a test cable, and the test cable is equivalent to a cable capacitor C because the test cable is equivalent to a capacitor in the device 9 A voltage acquisition module, a current signal acquisition device and a cable capacitor C are connected in parallel 9 The control and acquisition module is connected in series and used for collecting and analyzing a voltage feedback signal input by the voltage division and feeding circuit, a test sample current signal input by the current signal collector and a test sample voltage signal; the device can be used for carrying out withstand voltage test, dielectric loss tangent tan delta detection and leakage current test on a test cable. The device can generate bipolar direct current voltage and ultralow frequency sinusoidal voltage by using the power frequency power supply, can perform voltage withstand test, dielectric loss tangent tan delta detection and leakage current test on a test cable, reduces test cost, and can change a bidirectional controllable multistage voltage doubling circuitThe number of the medium bidirectional controllable voltage doubling circuits is used for adjusting the voltage grade output by the bidirectional controllable multistage voltage doubling circuits, and the expansibility is good.
Furthermore, the rectification charging circuit comprises a power frequency power supply U and a first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 Charging resistor R 1 And an energy storage capacitor C 1 The first diode D 1 A second diode D 2 A third diode D 3 And a fourth diode D 4 Forming a bridge rectifier circuit, one end of the power frequency power supply U and the first diode D 1 The other end of the power frequency power supply U is connected with the third diode D 3 Is connected to the positive pole of the charging resistor R 1 Is connected to the fourth diode D 4 The positive electrode of (2), the charging resistor R 1 The other end of the second switch is connected to a second input end b of the high-frequency inverter circuit, and the energy storage capacitor C 1 Is inputted to the first input end a of the high-frequency inverter circuit, and the energy storage capacitor C 1 And the other end of the second input terminal b is input into a second input terminal b of the high-frequency inverter circuit.
Further, the high frequency inverter circuit includes a first bidirectional controllable switch S 1 A second bidirectional controllable switch S 2 And a third bidirectional controllable switch S 3 And a fourth bidirectional controllable switch S 4 Said first bidirectional controllable switch S 1 First terminal of and the fourth bidirectional controllable switch S 4 Is connected to the second terminal of the fourth bidirectional controllable switch S 4 First terminal of and the third bidirectional controllable switch S 3 Is connected to the first terminal of the third bidirectional controllable switch S 3 And the second terminal of the second bidirectional controllable switch S 2 Is connected to the first terminal of the first bidirectional controllable switch S, the second bidirectional controllable switch S 2 And the second terminal of the first bi-directional controllable switch S 1 Is connected to the first bi-directional controllable switch S 1 And the second end of the second bidirectional controllable switch S 2 The second end of the third bidirectional controllable switch S is a first input end a of the high-frequency inverter circuit 3 First end of andthe fourth bidirectional controllable switch S 4 The first end of the high-frequency transformer T is connected with the second bidirectional controllable switch S, and the low-voltage side end of the high-frequency transformer T is connected with the second input end b of the high-frequency inverter circuit 2 The other end of the low-voltage side of the high-frequency transformer T is connected to the fourth bidirectional controllable switch S 4 The second end of (a).
Preferably, the bidirectional controllable multistage voltage doubling circuit comprises a first bidirectional controllable voltage doubling circuit, a second bidirectional controllable voltage doubling circuit and a third bidirectional controllable voltage doubling circuit, one end of the high-voltage side of the high-frequency transformer T is connected to a third connection end c of the first bidirectional controllable voltage doubling circuit, the other end of the high-voltage side of the high-frequency transformer T is connected to a fourth connection end d of the first bidirectional controllable voltage doubling circuit, the first bidirectional controllable voltage doubling circuit is connected to the second bidirectional controllable voltage doubling circuit in parallel, and the second bidirectional controllable voltage doubling circuit is connected to the third bidirectional controllable voltage doubling circuit in parallel. The bidirectional controllable multistage voltage doubling circuit in the technical scheme can convert high-frequency alternating current into positive and negative bipolar 30kV high-voltage current.
Further, the first bidirectional controllable voltage-multiplying circuit comprises a first charging capacitor C 2 A second charging capacitor C 3 The fifth bidirectional controllable switch S 5 Sixth bidirectional controllable switch S 6 Seventh bidirectional controllable switch S 7 And an eighth bidirectional controllable switch S 8 Said fifth bidirectional controllable switch S 5 The first end of the second bidirectional controllable voltage-multiplying circuit is connected to a fifth connecting end e of the second bidirectional controllable voltage-multiplying circuit, and the fifth bidirectional controllable switch S 5 And the second end of the sixth bidirectional controllable switch S 6 Is connected to the sixth bidirectional controllable switch S 6 The first end of the first bidirectional controllable voltage-multiplying circuit is a fourth access end d of the first bidirectional controllable voltage-multiplying circuit, and the seventh bidirectional controllable switch S 7 The first end of the second bidirectional controllable voltage-multiplying circuit is connected to a fifth connecting end e of the second bidirectional controllable voltage-multiplying circuit, and the seventh bidirectional controllable switch S 7 Second end of the first bidirectional controllable switch S is connected with the eighth bidirectional controllable switch S 8 The eighth bidirectional controllable switch S 8 Has a first terminal connected to a sixth terminal of the second bidirectional controllable voltage-multiplying circuitAn access end f, the first charging capacitor C 2 Is connected to a fifth connection terminal e of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C 2 The other end of the first bi-directional controllable voltage-multiplying circuit is a third access end C of the first bi-directional controllable voltage-multiplying circuit, and the second charging capacitor C 3 Is connected to a sixth connection end f of the second bidirectional controllable voltage-multiplying circuit, and the second charging capacitor C 3 Is connected to the sixth bidirectional controllable switch S 6 The first end of (a).
Furthermore, the second bidirectional controllable voltage-multiplying circuit comprises a third charging capacitor C 4 A fourth charging capacitor C 5 Ninth bidirectional controllable switch S 9 The tenth bidirectional controllable switch S 10 Eleventh bidirectional controllable switch S 11 And a twelfth bidirectional controllable switch S 12 The ninth bidirectional controllable switch S 9 The first end of the second bidirectional controllable voltage-multiplying circuit is connected to a seventh connecting end g of the third bidirectional controllable voltage-multiplying circuit, and the ninth bidirectional controllable switch S 9 And the second terminal of the first bi-directional controllable switch S 10 Is connected to the tenth bidirectional controllable switch S 10 The first end of the second bidirectional controllable voltage-multiplying circuit is a sixth access end f of the second bidirectional controllable voltage-multiplying circuit, and the eleventh bidirectional controllable switch S 11 Has a first end connected to a seventh access end g of a third bidirectional controllable voltage-multiplying circuit, and the eleventh bidirectional controllable switch S 11 Second end of the first bidirectional controllable switch S is connected with the twelfth bidirectional controllable switch S 12 The second end of (b), the twelfth bidirectional controllable switch S 12 The first end of the third bidirectional controllable voltage-multiplying circuit is connected to the eighth connecting end h of the third bidirectional controllable voltage-multiplying circuit, and the third charging capacitor C 4 Is connected to a seventh connection terminal g of the third bidirectional controllable voltage-multiplying circuit, and the third charging capacitor C 4 The other end of the first capacitor is a fifth access end e of the second bidirectional controllable voltage-multiplying circuit, and the fourth charging capacitor C 5 Is connected to the eighth input terminal h of the third bidirectional controllable voltage-multiplying circuit, and the fourth charging capacitor C 5 The other end of the first bidirectional controllable switch is connected to the tenth bidirectional controllable switch S 10 The first end of (a).
Further, the third bi-directional controllable voltage-multiplying circuit comprisesFifth charging capacitor C 6 And a sixth charging capacitor C 7 Thirteenth bidirectional controllable switch S 13 Fourteenth bidirectional controllable switch S 14 Fifteenth bidirectional controllable switch S 15 And sixteenth bidirectional controllable switch S 16 Said thirteenth bidirectional controllable switch S 13 Is connected to a first contact i, the thirteenth bidirectional controllable switch S 13 And the fourteenth bidirectional controllable switch S 14 To the fourteenth bidirectional controllable switch S 14 The first end of the second bidirectional controllable voltage-multiplying circuit is an eighth access end h of the third bidirectional controllable voltage-multiplying circuit, and the fifteenth bidirectional controllable switch S 15 A first end of the first switch is connected to a first contact point i, and the fifteenth bidirectional controllable switch S 15 The second end of the first bidirectional controllable switch is connected with the sixteenth bidirectional controllable switch S 16 The sixteenth bidirectional controllable switch S 16 A first end of the third bidirectional controllable voltage-multiplying circuit is connected to a first output end j of the third bidirectional controllable voltage-multiplying circuit, and the fifth charging capacitor C 6 Is connected to a first contact i, the fifth charging capacitor C 6 The other end of the third bidirectional controllable voltage-multiplying circuit is a seventh access end g of the third bidirectional controllable voltage-multiplying circuit, and the sixth charging capacitor C 7 Is the first output terminal j of the third bidirectional controllable voltage-multiplying circuit, and the seventh charging capacitor C 7 Is connected to the fourteenth bidirectional controllable switch S 14 The first end of (a).
Further, the voltage division feedback circuit comprises a first voltage division resistor R 2 And a second voltage dividing resistor R 3 Said first divider resistor R 2 One end of the first bi-directional controllable voltage-multiplying circuit is connected to the fourth connection end d of the first bi-directional controllable voltage-multiplying circuit, and the first voltage-dividing resistor R 2 And the other end of the second voltage-dividing resistor R 3 Is connected to one end of the second voltage-dividing resistor R 3 Is further connected with the control and acquisition module, and the second voltage-dividing resistor R 3 The other end of the third bi-directional controllable voltage-multiplying circuit is connected to a first output end j of the third bi-directional controllable voltage-multiplying circuit. The voltage division feedback circuit inputs a voltage feedback signal into the control and acquisition module, and the control and acquisition module can measure the output voltage of the current bidirectional controllable multistage voltage doubling circuit in real time; partial pressure feedbackThe circuit can make the device generate ultralow frequency sinusoidal voltage according to the hysteresis comparison principle.
Further, the filter circuit comprises a second resistor R 4 And a first capacitor C 8 Said first capacitance C 8 One end of the first capacitor C is connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit 8 The other end of the first resistor is connected to a fourth connecting end d of the first bidirectional controllable voltage-multiplying circuit, and the second resistor R 4 One end of the second resistor R is connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit, and the second resistor R 4 The other end of the first resistor R is connected to a ninth input end k of the voltage acquisition module 7 One end of the first resistor R is connected to the fourth connection end d of the first bidirectional controllable voltage-multiplying circuit, and the first resistor R 7 And the other end of the second switch is connected to a tenth input end n of the voltage acquisition module. The filter circuit is mainly used for filtering current, so that the current flowing through the test cable is a sinusoidal current with small ripples when the device works in an ultra-low frequency sinusoidal state.
Further, the voltage collecting module comprises a third voltage dividing resistor R 5 And a fourth voltage dividing resistor R 6 Said third voltage dividing resistor R 5 Is the ninth input terminal k of the voltage acquisition module, and the third voltage dividing resistor R 5 And the other end of the second resistor and the fourth voltage dividing resistor R 6 Is connected to the third voltage dividing resistor R 5 The other end of the voltage divider is also connected with the control and acquisition module, and the fourth voltage dividing resistor R 6 The other end of the voltage acquisition module is a tenth input end n of the voltage acquisition module, and the cable capacitor C 9 One end of the voltage acquisition module is connected to the ninth input end k of the voltage acquisition module, and the cable capacitor C 9 The other end is connected to a tenth input end n of the voltage acquisition module. The voltage acquisition module inputs a test sample voltage signal of the test sample cable into the control and acquisition module, and the current signal collector inputs a test sample current signal of the test sample cable into the control and acquisition moduleAnd (5) blocking.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, through the cooperation of the high-frequency inverter circuit, the rectifying charging circuit, the bidirectional controllable multistage voltage doubling circuit and the voltage division feedback circuit, a power frequency power supply can generate positive and negative polarity high-voltage direct current and ultralow frequency sinusoidal voltage, so that an expensive high-voltage direct current power supply is avoided being directly used, and the detection cost is saved;
2. the bidirectional controllable voltage-multiplying circuit has better expansibility and can be expanded to a higher voltage level by changing the number of the bidirectional controllable voltage-multiplying circuits in the bidirectional controllable multistage voltage-multiplying circuit;
3. according to the invention, through the cooperation of the voltage division feedback circuit, the voltage acquisition module and the current signal collector, the voltage resistance test, the dielectric loss tangent tan delta detection and the leakage current test can be carried out on the test cable.
Drawings
Fig. 1 is a schematic circuit diagram of a high voltage generator for insulation testing of distribution cables according to the present invention.
Fig. 2 is a specific circuit diagram of the rectifying charging circuit according to the present invention.
FIG. 3 is a specific circuit diagram of the high frequency reverse circuit according to the present invention
Fig. 4 is a specific circuit diagram of the bidirectional controllable multi-stage voltage-multiplying circuit according to the present invention.
The graphic symbols are as follows:
the circuit comprises a 1-bidirectional controllable multistage voltage doubling circuit, a 2-voltage division feedback circuit, a 3-filter circuit, a 4-voltage acquisition module, a 5-high frequency inverter circuit and a 6-rectification charging circuit.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the same, the same is shown by way of illustration only and not in the form of limitation; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operate, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and it is possible for one of ordinary skill in the art to understand the specific meaning of the above terms according to the specific situation.
First embodiment
Fig. 1 to 3 show a first embodiment of a high voltage generator for insulation testing of distribution cables according to the present invention. A high voltage generator for distribution cable insulation test comprises a bidirectional controllable multistage voltage doubling circuit 1, a high-frequency transformer T, a high-frequency inverter circuit 5, a rectification charging circuit 6, a voltage division feedback circuit 2, a filter circuit 3 and a cable capacitor C 9 A voltage acquisition module 4, a current signal collector and a first resistor R 7 And the control and acquisition module, the rectification charging circuit 6 is connected with the high-frequency inverter circuit 5 in parallel, the high-frequency inverter circuit 5 is connected with the bidirectional controllable multistage voltage-multiplying circuit 1 through a high-frequency transformer T, the bidirectional controllable multistage voltage-multiplying circuit 1 is formed by three bidirectional controllable voltage-multiplying circuits in parallel, the voltage division feedback circuit 2 is connected with the bidirectional controllable multistage voltage-multiplying circuit 1 in parallel, the filter circuit 3 is sequentially connected with a first resistor R in series 7 And cable capacitance C 9 The rear part is connected in parallel with a voltage division feedback circuit 2, a voltage acquisition module 4 and a cable capacitor C 9 Connected in parallel, the current signal collector and the first resistor R 7 And the voltage division branch feed circuit, the current signal collector and the voltage collection module 4 are connected with the control and collection module in parallel.
Referring to fig. 2, the rectifying charging circuit 6 includes a power frequency power supply U and a first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 Charging resistor R 1 And an energy storage capacitor C 1 First diode D 1 A second diode D 2 A third diode D 3 And a fourth diode D 4 Forming a bridge rectifier circuit, one end of a power frequency power supply U and a first diode D 1 The other end of the power frequency power supply U is connected with a third diode D 3 Is connected to the positive pole of the charging resistor R 1 Is connected to a fourth diode D 4 Positive electrode of (2), charging resistor R 1 The other end of the first switch is connected to a second input end b of the high-frequency inverter circuit 5 and an energy storage capacitor C 1 One end of the first input terminal a is input into the first input terminal a of the high-frequency inverter circuit 5, and the energy storage capacitor C is input into the second input terminal a 1 And the other end thereof is input to a second input terminal b of the high-frequency inverter circuit 5.
Referring to fig. 3, the high frequency inverter circuit 5 includes a first bidirectional controllable switch S 1 A second bidirectional controllable switch S 2 And the third bidirectional controllable switch S 3 And a fourth bidirectional controllable switch S 4 First bidirectional controllable switch S 1 First terminal and fourth bidirectional controllable switch S 4 Is connected to a fourth bidirectional controllable switch S 4 First terminal and third bidirectional controllable switch S 3 Is connected to a third bidirectional controllable switch S 3 And a second terminal of the second bidirectional controllable switch S 2 Is connected to a first terminal of a second bidirectional controllable switch S 2 Second terminal and first bidirectional controllable switch S 1 Is connected to the second terminal of the first bi-directional controllable switch S 1 And a second terminal of the second bidirectional controllable switch S 2 The second end of the first bidirectional controllable switch S is a first input end a of the high-frequency inverter circuit 5, and a third bidirectional controllable switch S 3 First terminal and fourth bidirectional controllable switch S 4 The first end of the high-frequency transformer T is connected with the second bidirectional controllable switch S, and the second end of the high-frequency transformer T is connected with the second input end b of the high-frequency inverter circuit 5 2 The other end of the low-voltage side of the high-frequency transformer T is connected with a fourth bidirectional controllable switch S 4 The second end of (a).
Referring to fig. 4, the bidirectional controllable multi-stage voltage-doubling circuit 1 includes a first bidirectional controllable voltage-doubling circuit, a second bidirectional controllable voltage-doubling circuit, and a third bidirectional controllable voltage-doubling circuit, one end of the high-voltage side of the high-frequency transformer T is connected to a third connection terminal c of the first bidirectional controllable voltage-doubling circuit, the other end of the high-voltage side of the high-frequency transformer T is connected to a fourth connection terminal d of the first bidirectional controllable voltage-doubling circuit, the first bidirectional controllable voltage-doubling circuit is connected to the second bidirectional controllable voltage-doubling circuit in parallel, and the second bidirectional controllable voltage-doubling circuit is connected to the third bidirectional controllable voltage-doubling circuit in parallel.
Wherein the first bidirectional controllable voltage-multiplying circuit comprises a first charging capacitor C 2 A second charging capacitor C 3 The fifth bidirectional controllable switch S 5 Sixth bidirectional controllable switch S 6 Seventh bidirectional controllable switch S 7 And an eighth bidirectional controllable switch S 8 Fifth bidirectional controllable switch S 5 Has a first end connected to a fifth input end e of the second bidirectional controllable voltage-multiplying circuit, and a fifth bidirectional controllable switch S 5 The second end of the first bidirectional controllable switch S and the sixth bidirectional controllable switch S 6 Is connected to the sixth bidirectional controllable switch S 6 The first end of the first bidirectional controllable voltage-multiplying circuit is a fourth access end d of the first bidirectional controllable voltage-multiplying circuit, and the seventh bidirectional controllable switch S 7 Is connected to a fifth access terminal e of the second bidirectional controllable voltage-multiplying circuit, and a seventh bidirectional controllable switch S 7 Second terminal of the first bidirectional controllable switch S is connected with the eighth bidirectional controllable switch S 8 The second end of (1), the eighth bidirectional controllable switch S 8 The first end of the first capacitor is connected to the sixth access end f of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C 2 Has one end connected to the fifth access end e of the second bidirectional controllable voltage-multiplying circuit, and a first charging capacitor C 2 The other end of the first bi-directional controllable voltage-multiplying circuit is a third access end C of the first bi-directional controllable voltage-multiplying circuit and a second charging capacitor C 3 Has one end connected to the sixth input end f of the second bidirectional controllable voltage-multiplying circuit, and a second charging capacitor C 3 Is connected to a sixth bidirectional controllable switch S 6 The first end of (a). The second bidirectional controllable voltage-multiplying circuit comprises a third charging capacitor C 4 A fourth charging capacitor C 5 Ninth bidirectional controllable switch S 9 The tenth bidirectional controllable switch S 10 Eleventh bidirectional controllable switch S 11 And a twelfth bidirectionally controllable switch S 12 Ninth bidirectional controllable switch S 9 The first end of (A) is connected to the third endSeventh switch-in end g of bidirectional controllable voltage-multiplying circuit, ninth bidirectional controllable switch S 9 The second end of the first bidirectional controllable switch S and the tenth bidirectional controllable switch S 10 Is connected with the second end of the tenth bidirectional controllable switch S 10 The first end of the second bidirectional controllable voltage-multiplying circuit is a sixth access end f of the second bidirectional controllable voltage-multiplying circuit, and the eleventh bidirectional controllable switch S 11 Is connected to a seventh access end g of the third bidirectional controllable voltage-multiplying circuit and an eleventh bidirectional controllable switch S 11 Second end of the first bidirectional controllable switch S is connected with a twelfth bidirectional controllable switch S 12 A second terminal of (2), a twelfth bidirectional controllable switch S 12 The first end of the third bidirectional controllable voltage-multiplying circuit is connected to the eighth access end h of the third bidirectional controllable voltage-multiplying circuit, and the third charging capacitor C 4 Is connected to a seventh access end g of the third bidirectional controllable voltage-multiplying circuit, and a third charging capacitor C 4 The other end of the first capacitor is a fifth access end e of a second bidirectional controllable voltage-multiplying circuit, and a fourth charging capacitor C 5 Has one end connected to the eighth input end h of the third bidirectional controllable voltage-multiplying circuit and a fourth charging capacitor C 5 Is connected to a tenth bidirectional controllable switch S at the other end 10 The first end of (a). The third bidirectional controllable voltage-multiplying circuit comprises a fifth charging capacitor C 6 A sixth charging capacitor C 7 Thirteenth bidirectional controllable switch S 13 Fourteenth bidirectional controllable switch S 14 Fifteenth bidirectional controllable switch S 15 And sixteenth bidirectional controllable switch S 16 Thirteenth bidirectional controllable switch S 13 Has a first end connected to a first contact i, a thirteenth bidirectional controllable switch S 13 Second terminal and fourteenth bidirectional controllable switch S 14 Is connected to the fourteenth bidirectional controllable switch S 14 The first end of the first bidirectional controllable voltage doubling circuit is an eighth access end h of the third bidirectional controllable voltage doubling circuit, and the fifteenth bidirectional controllable switch S 15 A first end of the first bi-directional controllable switch is connected to a first contact point i, and a fifteenth bi-directional controllable switch S 15 Is connected to the sixteenth bidirectional controllable switch S 16 The sixteenth bidirectional controllable switch S 16 Is connected to the first output terminal j of the third bidirectional controllable voltage-multiplying circuit, and a fifth charging capacitor C 6 Has one end connected to the first contact i and the fifth charging capacitor C 6 The other end of the first bidirectional controllable voltage-multiplying circuit is a seventh access end g of a third bidirectional controllable voltage-multiplying circuit, and the sixth charging is carried outCapacitor C 7 One end of the first capacitor is a first output end j of a third bidirectional controllable voltage-multiplying circuit, and a seventh charging capacitor C 7 The other end of the first switch is connected with a fourteenth bidirectional controllable switch S 14 The first end of (a).
The voltage division feedback circuit 2 comprises a first voltage division resistor R 2 And a second voltage dividing resistor R 3 First divider resistor R 2 Has one end connected to the fourth access end d of the first bidirectional controllable voltage-multiplying circuit, and a first voltage-dividing resistor R 2 And the other end of the second resistor and a second divider resistor R 3 Is connected to one end of a second divider resistor R 3 One end of the second voltage-dividing resistor R is also connected with the control and acquisition module 3 Is connected to the first output terminal j of the third bidirectional controllable voltage-multiplying circuit
The filter circuit 3 comprises a second resistor R 4 And a first capacitor C 8 First capacitor C 8 Has one end connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit and the first capacitor C 8 The other end of the first resistor is connected to a fourth connecting end d of the first bidirectional controllable voltage-multiplying circuit, and a second resistor R 4 Has one end connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit, and a second resistor R 4 The other end of the first resistor is connected to a ninth input terminal k of the voltage acquisition module 4, and a first resistor R 7 Has one end connected to the fourth connection end d of the first bidirectional controllable voltage-multiplying circuit, and a first resistor R 7 The other end of the voltage sampling module 4 is connected to a tenth input end n of the voltage sampling module 4. The voltage acquisition module 4 comprises a third voltage dividing resistor R 5 And a fourth voltage dividing resistor R 6 Third voltage dividing resistor R 5 Is a ninth input terminal k of the voltage acquisition module 4, and a third voltage dividing resistor R 5 And the other end of the second resistor and a fourth voltage dividing resistor R 6 Is connected to a third divider resistor R 5 The other end of the voltage divider is also connected with a control and acquisition module, and a fourth voltage dividing resistor R 6 The other end of the voltage acquisition module 4 is a tenth input end n of the voltage acquisition module and a cable capacitor C 9 One end of the voltage acquisition module 4 is connected with a ninth input end k of the voltage acquisition module and a cable capacitor C 9 The other end is connected to a tenth input end n of the voltage acquisition module 4.
In this embodiment, the bidirectional controllable switch is formed by connecting an Insulated Gate Bipolar Transistor (IGBT) and a diode in reverse parallel, wherein a first end of the bidirectional controllable switch is an emitter of the Insulated Gate Bipolar Transistor (IGBT), and a second end of the bidirectional controllable switch is a collector of the Insulated Gate Bipolar Transistor (IGBT).
In this embodiment, the storage capacitor C 1 An aluminum electrolytic capacitor is adopted. The rectification charging circuit 6 and the high-frequency inverter circuit 5 rectify and invert the power frequency alternating current to form high-frequency alternating current, the high-frequency alternating current is boosted through the high-frequency transformer T, the boosted high-frequency alternating current generates positive and negative bipolar 30kV high voltage in the bidirectional controllable multistage voltage doubling circuit 1, and the withstand voltage test is carried out on a test cable; the voltage division feedback circuit 2 can enable the embodiment to generate ultralow-frequency sinusoidal voltage according to the hysteresis comparison principle, the filter circuit 3 ensures that the current flowing through the test cable is sinusoidal current with small ripples, the control and acquisition module can form voltage waveforms and current waveforms through test voltage signals and test current signals acquired on the test cable, and the dielectric loss tangent value tan delta of the test cable is calculated according to the phase difference between the voltage waveforms and the current waveforms.
In this embodiment, the acquisition and control module includes three a/D converters and one FPGA control chip, the three a/D converters are all connected to the FPGA control chip, the voltage feedback signal, the sample current signal and the sample voltage signal are respectively connected to the FPGA control chip through one a/D converter, and the FPGA control chip is further connected to a photoelectric signal converter for transmitting an inversion signal to the high-frequency reverse circuit 5 and a photoelectric signal converter for transmitting a high-voltage switch control signal to the bidirectional controllable multi-stage voltage-multiplying circuit 1.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A high voltage generator for insulation testing of distribution cables, characterized in that: comprises a bidirectional controllable multistage voltage doubling circuit, a high-frequency transformer T, a high-frequency inverter circuit, a rectifying charging circuit, a voltage division feedback circuit, a filter circuit and a cable capacitor C 9 Voltage acquisition module, current signal collector and first resistor R 7 And the control and acquisition module, the rectification charging circuit with high frequency inverter circuit parallel connection, high frequency inverter circuit with two-way controllable multistage voltage doubling circuit passes through high frequency transformer T connects, two-way controllable multistage voltage doubling circuit comprises a plurality of two-way controllable voltage doubling circuit in parallel connection, partial pressure feedback circuit with two-way controllable multistage voltage doubling circuit parallel connection, filter circuit establishes ties in proper order first resistance R 7 And cable capacitance C 9 The rear part is connected in parallel to the voltage division feedback circuit, the voltage acquisition module and the cable capacitor C 9 Connected in parallel, the current signal collector and the first resistor R 7 The voltage division feedback circuit, the current signal collector and the voltage collection module are connected with the control and collection module in parallel;
the rectification charging circuit comprises a power frequency power supply U and a first diode D 1 A second diode D 2 A third diode D 3 A fourth diode D 4 Charging resistor R 1 And an energy storage capacitor C 1 The first diode D 1 A second diode D 2 A third diode D 3 And a fourth diode D 4 Forming a bridge rectifier circuit, one end of the power frequency power supply U and the first diode D 1 The other end of the power frequency power supply U is connected with the third diode D 3 Is connected to the positive pole of the charging resistor R 1 Is connected to the fourth diode D 4 The positive electrode of (2), the charging resistor R 1 The other end of the second capacitor is connected with a second input end b of the high-frequency inverter circuit, and the energy storage capacitor C 1 Is connected with the first input end a of the high-frequency inverter circuit, and the energy storage capacitor C 1 The other end of the first and second terminals is connected to a second terminal of the high-frequency inverter circuitAn input terminal b;
the high-frequency inverter circuit comprises a first bidirectional controllable switch S 1 A second bidirectional controllable switch S 2 And a third bidirectional controllable switch S 3 And a fourth bidirectional controllable switch S 4 Said first bidirectional controllable switch S 1 First terminal of and the fourth bidirectional controllable switch S 4 Is connected to the second terminal of the fourth bidirectional controllable switch S 4 First terminal of and the third bidirectional controllable switch S 3 Is connected to the first terminal of the third bidirectional controllable switch S 3 And the second terminal of the second bidirectional controllable switch S 2 Is connected to the first terminal of the first bidirectional controllable switch S 2 And the second terminal of the first bi-directional controllable switch S 1 Is connected to the first bi-directional controllable switch S 1 And the second end of the second bidirectional controllable switch S 2 The second end of the third bidirectional controllable switch S is connected to the first input end a of the high-frequency inverter circuit 3 First terminal of and the fourth bidirectional controllable switch S 4 The first end of the high-frequency transformer T is connected with the second bidirectional controllable switch S, and the connection point of the first end of the high-frequency transformer T is the second input end b of the high-frequency inverter circuit 2 The other end of the low-voltage side of the high-frequency transformer T is connected to the fourth bidirectional controllable switch S 4 A second end of (a);
the bidirectional controllable multistage voltage doubling circuit comprises a first bidirectional controllable voltage doubling circuit, a second bidirectional controllable voltage doubling circuit and a third bidirectional controllable voltage doubling circuit, one end of the high-voltage side of the high-frequency transformer T is connected to a third connection end c of the first bidirectional controllable voltage doubling circuit, the other end of the high-voltage side of the high-frequency transformer T is connected to a fourth connection end d of the first bidirectional controllable voltage doubling circuit, the first bidirectional controllable voltage doubling circuit is connected to the second bidirectional controllable voltage doubling circuit in parallel, and the second bidirectional controllable voltage doubling circuit is connected to the third bidirectional controllable voltage doubling circuit in parallel;
the first bidirectional controllable voltage-multiplying circuit comprises a first charging capacitor C 2 A second charging capacitor C 3 The fifth bidirectional controllable switch S 5 Sixth two-wayControl switch S 6 Seventh bidirectional controllable switch S 7 And an eighth bidirectional controllable switch S 8 Said fifth bidirectional controllable switch S 5 The first end of the second bidirectional controllable voltage-multiplying circuit is connected to a fifth connecting end e of the second bidirectional controllable voltage-multiplying circuit, and the fifth bidirectional controllable switch S 5 And the second end of the sixth bidirectional controllable switch S 6 Is connected to the second terminal of the sixth bidirectional controllable switch S 6 The first end of the first bidirectional controllable voltage-multiplying circuit is a fourth access end d of the first bidirectional controllable voltage-multiplying circuit, and the seventh bidirectional controllable switch S 7 The first end of the second bidirectional controllable voltage-multiplying circuit is connected to a fifth connecting end e of the second bidirectional controllable voltage-multiplying circuit, and the seventh bidirectional controllable switch S 7 Second end of the first bidirectional controllable switch S is connected with the eighth bidirectional controllable switch S 8 The eighth bidirectional controllable switch S 8 The first end of the first charging capacitor C is connected to the sixth connecting end f of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C 2 Is connected to a fifth connection terminal e of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C 2 The other end of the first bi-directional controllable voltage-multiplying circuit is a third access end C of the first bi-directional controllable voltage-multiplying circuit, and the second charging capacitor C 3 Is connected to a sixth connection end f of the second bidirectional controllable voltage-multiplying circuit, and the second charging capacitor C 3 Is connected to the sixth bidirectional controllable switch S 6 The first end of (a).
2. A high voltage generator for insulation testing of distribution cables according to claim 1, characterized in that: the second bidirectional controllable voltage-multiplying circuit comprises a third charging capacitor C 4 A fourth charging capacitor C 5 Ninth bidirectional controllable switch S 9 The tenth bidirectional controllable switch S 10 Eleventh bidirectional controllable switch S 11 And a twelfth bidirectional controllable switch S 12 The ninth bidirectional controllable switch S 9 The first end of the second bidirectional controllable voltage-multiplying circuit is connected to a seventh connecting end g of the third bidirectional controllable voltage-multiplying circuit, and the ninth bidirectional controllable switch S 9 And the second end of the second switch and the tenth bidirectional controllable switch S 10 Is connected to the tenth bidirectional controllable switch S 10 The first end of (A) is said second pairTo a sixth access terminal f of the controllable voltage doubling circuit, the eleventh bidirectional controllable switch S 11 Has a first end connected to a seventh access end g of a third bidirectional controllable voltage-multiplying circuit, and the eleventh bidirectional controllable switch S 11 Second end of the first bidirectional controllable switch S is connected with the twelfth bidirectional controllable switch S 12 The second end of (b), the twelfth bidirectional controllable switch S 12 The first end of the third charging capacitor C is connected to the eighth connecting end h of the third bidirectional controllable voltage-multiplying circuit 4 Is connected to a seventh connection terminal g of the third bidirectional controllable voltage-multiplying circuit, and the third charging capacitor C 4 The other end of the first capacitor is a fifth access end e of the second bidirectional controllable voltage-multiplying circuit, and the fourth charging capacitor C 5 Is connected to the eighth input terminal h of the third bidirectional controllable voltage-multiplying circuit, and the fourth charging capacitor C 5 The other end of the first bidirectional controllable switch is connected to the tenth bidirectional controllable switch S 10 The first end of (a).
3. A high voltage generator for insulation testing of distribution cables according to claim 1, characterized in that: the third bidirectional controllable voltage-multiplying circuit comprises a fifth charging capacitor C 6 A sixth charging capacitor C 7 Thirteenth bidirectional controllable switch S 13 Fourteenth bidirectional controllable switch S 14 Fifteenth bidirectional controllable switch S 15 And sixteenth bidirectional controllable switch S 16 Said thirteenth bidirectional controllable switch S 13 Is connected to a first contact i, the thirteenth bidirectional controllable switch S 13 And the fourteenth bidirectional controllable switch S 14 To the fourteenth bidirectional controllable switch S 14 The first end of the second bidirectional controllable voltage-multiplying circuit is an eighth access end h of the third bidirectional controllable voltage-multiplying circuit, and the fifteenth bidirectional controllable switch S 15 Has a first end connected to a first contact i, and a fifteenth bidirectional controllable switch S 15 The second end of the switch is connected to the sixteenth bidirectional controllable switch S 16 The sixteenth bidirectional controllable switch S 16 A first end of the third bidirectional controllable voltage-multiplying circuit is connected to a first output end j of the third bidirectional controllable voltage-multiplying circuit, and the fifth charging capacitor C 6 One end of the first switch is connected toA contact point i, the fifth charging capacitor C 6 The other end of the third bidirectional controllable voltage-multiplying circuit is a seventh access end g of the third bidirectional controllable voltage-multiplying circuit, and the sixth charging capacitor C 7 Is the first output terminal j of the third bidirectional controllable voltage-multiplying circuit, and the seventh charging capacitor C 7 Is connected to the fourteenth bidirectional controllable switch S 14 The first end of (a).
4. A high voltage generator for insulation testing of distribution cables according to claim 3, characterized in that: the voltage division feedback circuit comprises a first voltage division resistor R 2 And a second voltage dividing resistor R 3 Said first divider resistance R 2 One end of the first bi-directional controllable voltage-multiplying circuit is connected to the fourth connection end d of the first bi-directional controllable voltage-multiplying circuit, and the first voltage-dividing resistor R 2 And the other end of the second voltage-dividing resistor R 3 Is connected to one end of the second voltage-dividing resistor R 3 Is further connected with the control and acquisition module, the second divider resistor R 3 And the other end of the third bi-directional controllable voltage-multiplying circuit is connected to a first output end j of the third bi-directional controllable voltage-multiplying circuit.
5. A high voltage generator for insulation testing of distribution cables according to claim 4, characterized in that: the filter circuit comprises a second resistor R 4 And a first capacitor C 8 Said first capacitor C 8 One end of the first capacitor C is connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit 8 The other end of the first bi-directional controllable voltage-multiplying circuit is connected to a fourth connecting end d of the first bi-directional controllable voltage-multiplying circuit, and the second resistor R 4 One end of the second resistor is connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit, and the second resistor R 4 The other end of the first resistor R is connected to a ninth input end k of the voltage acquisition module, and the first resistor R 7 One end of the first resistor R is connected to the fourth connection end d of the first bidirectional controllable voltage-multiplying circuit, and the first resistor R 7 The other end of the voltage acquisition module is connected to a tenth input end n of the voltage acquisition module.
6. The method of claim 5A high voltage generator for insulation testing of distribution cables, characterized by: the voltage acquisition module comprises a third voltage dividing resistor R 5 And a fourth voltage dividing resistor R 6 Said third divider resistance R 5 Is the ninth input terminal k of the voltage acquisition module, and the third voltage dividing resistor R 5 And the other end of the second resistor and the fourth voltage dividing resistor R 6 Is connected to the third voltage dividing resistor R 5 The other end of the voltage divider is also connected with the control and acquisition module, and the fourth voltage dividing resistor R 6 The other end of the voltage acquisition module is a tenth input end n of the voltage acquisition module, and the cable capacitor C 9 One end of the voltage acquisition module is connected to a ninth input end k of the voltage acquisition module, and the cable capacitor C 9 The other end is connected to a tenth input end n of the voltage acquisition module.
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| CN112505426A (en) * | 2020-10-30 | 2021-03-16 | 南京民联仪器制造有限公司 | Cable dielectric loss measuring device working at ultralow frequency band test voltage and measuring method thereof |
| CN112600425B (en) * | 2020-12-02 | 2022-03-18 | 南京民联仪器制造有限公司 | Low-current controllable rectifier and rectification control method thereof |
| CN112706615B (en) * | 2020-12-28 | 2024-07-26 | 江苏银河电子股份有限公司 | Insulating safety device and electric vehicle with same |
| CN113295964B (en) * | 2021-05-21 | 2022-09-06 | 广东电网有限责任公司 | Power supply circuit for cable comprehensive test |
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| JP2785563B2 (en) * | 1992-01-20 | 1998-08-13 | 日立電線株式会社 | Ultra low frequency generator |
| WO1997009773A1 (en) * | 1995-09-08 | 1997-03-13 | Kabushiki Kaisha Yaskawa Denki | Power converter and power converting method |
| CN1988353A (en) * | 2006-12-07 | 2007-06-27 | 上海交通大学 | Cascade multiple indirect matrix converter |
| CN101127484B (en) * | 2007-05-23 | 2010-04-07 | 中国科学院电工研究所 | A Digital High Voltage DC Power Supply |
| CN201623632U (en) * | 2010-02-10 | 2010-11-03 | 武汉市泛科变电检修设备制造有限公司 | DC high-voltage power supply device |
| CN102983758A (en) * | 2012-12-11 | 2013-03-20 | 哈尔滨理工大学 | Polarity-reversal voltage generator based on direct current high voltage cascade generation circuit |
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