CN111624452A - 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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- CN111624452A CN111624452A CN202010409405.6A CN202010409405A CN111624452A CN 111624452 A CN111624452 A CN 111624452A CN 202010409405 A CN202010409405 A CN 202010409405A CN 111624452 A CN111624452 A CN 111624452A
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- 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 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 C9The 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, a voltage division feedback circuit, a bidirectional controllable multistage voltage-multiplying circuit and a power supply circuit, wherein the rectification charging circuit is connected with the high-frequency inverter circuit in parallel, the high-frequency inverter circuit and the bidirectional controllable multistageA first resistor R7And cable capacitance C9The rear part is connected in parallel with a voltage division feedback circuit, a voltage acquisition module and a cable capacitor C9Are 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 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 because the technologies used for the field test of the power cable are mostly from a direct current high-voltage power supply, and the cost of the direct current high-voltage power supply is high, the detection methods become factors which most block 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 comprises a bidirectional controllable multistage voltage-multiplying circuit, a high-frequency transformer T, a high-frequency inverter circuit, a rectifying and charging circuit, a voltage-dividing feedback circuit, a filter circuit and a cable capacitor C9Voltage acquisition module, current signal collector and first resistor R7And 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 R7And cable capacitance C9The rear part is connected in parallel to the voltage division feedback circuit, the voltage acquisition module and the cable capacitor C9Connected in parallel, the current signal collector and the first resistor R7And 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 the power frequency alternating current into high-frequency alternating current after rectification and inversion, the high-frequency alternating current is boosted through the high-frequency transformer T, and the boosted high-frequency alternating current is bidirectionally controllable and is multiplied in multiple stagesThe voltage division feedback circuit can measure the output voltage of the current bidirectional controllable multistage voltage doubling circuit in real time and can generate ultralow frequency sinusoidal voltage according to the hysteresis 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 device9A voltage acquisition module, a current signal acquisition device and a cable capacitor C are connected in parallel9The 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 detection and leakage current test on a test cable. This device utilizes power frequency power just can generate bipolar direct current voltage and ultralow frequency sinusoidal voltage, can carry out withstand voltage test, dielectric loss tangent tan detection and leakage current test to the sample cable, has reduced the test cost, and can be through changing the number of two-way controllable voltage doubling circuit among the two-way controllable multistage voltage doubling circuit, adjusts the voltage level of two-way controllable multistage voltage doubling circuit output, and expansibility is good.
Furthermore, the rectification charging circuit comprises a power frequency power supply U and a first diode D1A second diode D2A third diode D3A fourth diode D4Charging resistor R1And an energy storage capacitor C1The first diode D1A second diode D2A third diode D3And a fourth diode D4Forming a bridge rectifier circuit, one end of the power frequency power supply U and the first diode D1The other end of the power frequency power supply U is connected with the third diode D3The positive pole of the charging resistor R is connected1Is connected to the fourth diode D4The positive electrode of (1), the charging resistor R1The other end of the second input end is connected to a second input end b of the high-frequency inverter circuit, and the energy storage capacitor C1Is inputted to the first input end a of the high-frequency inverter circuit, and the energy storage capacitor C1The other end of the first input is input into a second input of the high-frequency inverter circuitAnd (b) an end.
Further, the high frequency inverter circuit comprises a first bidirectional controllable switch S1A second bidirectional controllable switch S2And a third bidirectional controllable switch S3And a fourth bidirectional controllable switch S4Said first bidirectional controllable switch S1First terminal of and the fourth bidirectional controllable switch S4Is connected to the second terminal of the fourth bidirectional controllable switch S4First terminal of and the third bidirectional controllable switch S3Is connected to the first terminal of the third bidirectional controllable switch S3And the second end of the second bidirectional controllable switch S2Is connected to the first terminal of the first bidirectional controllable switch S2And the second terminal of the first bidirectional controllable switch S1Is connected to the second terminal of the first bidirectional controllable switch S1And the second end of the second bidirectional controllable switch S2The second end of the third bidirectional controllable switch S is a first input end a of the high-frequency inverter circuit3First terminal of and the fourth bidirectional controllable switch S4The 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 circuit2The other end of the low-voltage side of the high-frequency transformer T is connected with the fourth bidirectional controllable switch S4The 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, it is characterized byThe first bidirectional controllable voltage-multiplying circuit comprises a first charging capacitor C2A second charging capacitor C3The fifth bidirectional controllable switch S5Sixth bidirectional controllable switch S6Seventh bidirectional controllable switch S7And an eighth bidirectional controllable switch S8Said fifth bidirectional controllable switch S5The 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 S5And the second end of the sixth bidirectional controllable switch S6Is connected to the sixth bidirectional controllable switch S6The 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 S7The 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 S7Second end of the first bidirectional controllable switch S is connected with the eighth bidirectional controllable switch S8The eighth bidirectional controllable switch S8The first end of the first capacitor C is connected to the sixth connection end f of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C2Is connected to a fifth connection end e of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C2The 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 C3Is connected to a sixth connection end f of the second bidirectional controllable voltage-multiplying circuit, and the second charging capacitor C3Is connected to the sixth bidirectional controllable switch S6The first end of (a).
Further, the second bidirectional controllable voltage-multiplying circuit comprises a third charging capacitor C4A fourth charging capacitor C5Ninth bidirectional controllable switch S9The tenth bidirectional controllable switch S10Eleventh bidirectional controllable switch S11And a twelfth bidirectional controllable switch S12The ninth bidirectional controllable switch S9The 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 S9And the second terminal of the first bi-directional controllable switch S10Is connected to the tenth bidirectional controllable switch S10First ofThe end of the second bidirectional controllable voltage doubling circuit is a sixth access end f of the second bidirectional controllable voltage doubling circuit, and the eleventh bidirectional controllable switch S11Is connected to a seventh connection end g of a third bidirectional controllable voltage-multiplying circuit, and the eleventh bidirectional controllable switch S11Second end of the first bidirectional controllable switch S is connected with the twelfth bidirectional controllable switch S12The twelfth bidirectional controllable switch S12The 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 C4One end of the third charging capacitor C is connected to a seventh connecting end g of the third bidirectional controllable voltage-multiplying circuit4The 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 C5Is connected to the eighth connection end h of the third bidirectional controllable voltage-multiplying circuit, and the fourth charging capacitor C5Is connected to the tenth bidirectional controllable switch S at the other end10The first end of (a).
Further, the third bidirectional controllable voltage-multiplying circuit comprises a fifth charging capacitor C6A sixth charging capacitor C7Thirteenth bidirectional controllable switch S13Fourteenth bidirectional controllable switch S14Fifteenth bidirectional controllable switch S15And sixteenth bidirectional controllable switch S16Said thirteenth bidirectional controllable switch S13Is connected to a first contact i, the thirteenth bidirectional controllable switch S13And the fourteenth bidirectional controllable switch S14Is connected to the fourteenth bidirectional controllable switch S14The 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 S15A first end of the first switch is connected to a first contact point i, and the fifteenth bidirectional controllable switch S15The second end of the first bidirectional controllable switch is connected with the sixteenth bidirectional controllable switch S16The sixteenth bidirectional controllable switch S16A 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 C6Is connected to a first contact i, the fifth charging capacitor C6The other end of the second switch is a seventh access end of the third bidirectional controllable voltage-multiplying circuitg, the sixth charging capacitor C7Is the first output terminal j of the third bidirectional controllable voltage-multiplying circuit, and the seventh charging capacitor C7Is connected to the fourteenth bidirectional controllable switch S14The first end of (a).
Further, the voltage division feedback circuit comprises a first voltage division resistor R2And a second voltage dividing resistor R3Said first divider resistor R2One 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 R2And the other end of the second voltage-dividing resistor R3Is connected to one end of the second voltage-dividing resistor R3Is further connected with the control and acquisition module, and the second voltage-dividing resistor R3And 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; the voltage division feedback circuit can enable the device to generate ultralow frequency sinusoidal voltage according to the hysteresis comparison principle.
Further, the filter circuit comprises a second resistor R4And a first capacitor C8Said first capacitor C8One end of the first capacitor C is connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit8The 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 R4One 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 R4The other end of the first resistor R is connected to a ninth input end k of the voltage acquisition module, and the first resistor R7One end of the first bi-directional controllable voltage-multiplying circuit is connected to the fourth connecting end d of the first bi-directional controllable voltage-multiplying circuit, and the first resistor R7And 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 when the device works in an ultralow-frequency sinusoidal state, the current flowing through the test cable is sinusoidal current with small ripples, and when the device works in an ultralow-frequency sinusoidal mode, the control and acquisition module can pass voltage waves on the test cableAnd calculating the dielectric loss tangent value tan of the sample cable according to the phase difference between the shape and the current waveform.
Further, the voltage acquisition module comprises a third voltage dividing resistor R5And a fourth voltage dividing resistor R6Said third voltage dividing resistor R5Is the ninth input terminal k of the voltage acquisition module, and the third voltage dividing resistor R5And the other end of the fourth voltage dividing resistor R6Is connected to the third voltage dividing resistor R5The other end of the voltage divider is also connected with the control and acquisition module, and the fourth voltage dividing resistor R6The other end of the voltage acquisition module is a tenth input end n of the voltage acquisition module, and the cable capacitor C9One end of the voltage acquisition module is connected to a ninth input end k of the voltage acquisition module, and the cable capacitor C9The 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 module.
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 doubling circuit has better expansibility and can be expanded to a higher voltage level by changing the number of the bidirectional controllable voltage doubling circuits in the bidirectional controllable multistage voltage doubling 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 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-doubling circuit according to the present invention.
The graphic symbols are illustrated 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 are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; 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 describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, 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 the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
First embodiment
Fig. 1 to 3 show a first embodiment of a high voltage generator for insulation testing of distribution cables according to the invention. A high voltage generator for insulation test of distribution cable comprises a bidirectional controllable multistage voltage doubling circuit 1, a high-frequency transformer T, a high-frequency inverter circuit 5, a rectifying charging circuitCircuit 6, voltage division feedback circuit 2, filter circuit 3 and cable capacitor C9Voltage acquisition module 4, current signal collector, first resistance R7And 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 doubling circuit 1 through a high-frequency transformer T, the bidirectional controllable multistage voltage doubling circuit 1 is formed by connecting three bidirectional controllable voltage doubling circuits in parallel, the voltage division feedback circuit 2 is connected with the bidirectional controllable multistage voltage doubling circuit 1 in parallel, and the filter circuit 3 is sequentially connected with a first resistor R in series7And cable capacitance C9The rear part is connected in parallel with a voltage division feedback circuit 2, a voltage acquisition module 4 and a cable capacitor C9Connected in parallel, the current signal collector and the first resistor R7And 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 and charging circuit 6 includes a power frequency power supply U and a first diode D1A second diode D2A third diode D3A fourth diode D4Charging resistor R1And an energy storage capacitor C1First diode D1A second diode D2A third diode D3And a fourth diode D4Forming a bridge rectifier circuit, one end of a power frequency power supply U and a first diode D1The other end of the power frequency power supply U is connected with a third diode D3Is connected to the positive pole of the charging resistor R1Is connected to a fourth diode D4Positive electrode of (2), charging resistor R1The other end of the first and second switches is connected to a second input end b of the high-frequency inverter circuit 5 and an energy storage capacitor C1One 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 a1And 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 S1A second bidirectional controllable switch S2And a third bidirectional controllable switch S3And a fourth bidirectional controllable switch S4A first bidirectional controllable switch S1First terminal and fourth bidirectional controllable switch S4Is connected to the second end of the fourth bidirectional controllableSwitch S4First terminal and third bidirectional controllable switch S3Is connected to a third bidirectional controllable switch S3And a second end of the second bidirectional controllable switch S2Is connected to a first terminal of a second bidirectional controllable switch S2Second terminal and first bidirectional controllable switch S1Is connected to the second terminal of the first bidirectional controllable switch S1And a second end of the second bidirectional controllable switch S2The second end of the first bidirectional controllable switch S is connected with the first input end a of the high-frequency inverter circuit 53First terminal and fourth bidirectional controllable switch S4The 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 52The other end of the low-voltage side of the high-frequency transformer T is connected with a fourth bidirectional controllable switch S4The 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 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 in parallel to the second bidirectional controllable voltage-doubling circuit, and the second bidirectional controllable voltage-doubling circuit is connected in parallel to the third bidirectional controllable voltage-doubling circuit.
Wherein the first bidirectional controllable voltage-multiplying circuit comprises a first charging capacitor C2A second charging capacitor C3The fifth bidirectional controllable switch S5Sixth bidirectional controllable switch S6Seventh bidirectional controllable switch S7And an eighth bidirectional controllable switch S8Fifth two-way controllable switch S5Is connected to a fifth access terminal e of the second bidirectional controllable voltage-multiplying circuit, and a fifth bidirectional controllable switch S5Second terminal and sixth bidirectional controllable switch S6Is connected to the sixth bidirectional controllable switch S6The 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 S7Is connected to a second bidirectional controllable voltage-multiplying unitA fifth access terminal e and a seventh bidirectional controllable switch S of the circuit7Second terminal of the first bidirectional controllable switch S is connected with the eighth bidirectional controllable switch S8The second end of (1), the eighth bidirectional controllable switch S8The first end of the first capacitor C is connected to the sixth access end f of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C2Has one end connected to the fifth access end e of the second bidirectional controllable voltage-multiplying circuit, and a first charging capacitor C2The 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 C3Has one end connected to the sixth connecting end f of the second bidirectional controllable voltage-multiplying circuit, and a second charging capacitor C3Is connected to a sixth bidirectional controllable switch S6The first end of (a). The second bidirectional controllable voltage-multiplying circuit comprises a third charging capacitor C4A fourth charging capacitor C5Ninth bidirectional controllable switch S9The tenth bidirectional controllable switch S10Eleventh bidirectional controllable switch S11And a twelfth bidirectional controllable switch S12Ninth bidirectional controllable switch S9The first end of the second bidirectional controllable voltage-multiplying circuit is connected with a seventh connecting end g of the third bidirectional controllable voltage-multiplying circuit, and a ninth bidirectional controllable switch S9Second terminal and tenth bidirectional controllable switch S10Is connected to the tenth bidirectional controllable switch S10The 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 S11Is connected to a seventh access end g of the third bidirectional controllable voltage-multiplying circuit and an eleventh bidirectional controllable switch S11Second end of the first bidirectional controllable switch S is connected with a twelfth bidirectional controllable switch S12A second terminal of (1), a twelfth bidirectional controllable switch S12The 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 C4Is connected to a seventh access end g of the third bidirectional controllable voltage-multiplying circuit, and a third charging capacitor C4The 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 C5Is connected to the eighth access end h of the third bidirectional controllable voltage-multiplying circuit, and a fourth charging capacitor C5Is connected to a tenth bidirectional controllable switch S at the other end10The first end of (a). The third bidirectional controllable voltage-multiplying circuit comprises a fifth charging capacitor C6And the sixth chargingCapacitor C7Thirteenth bidirectional controllable switch S13Fourteenth bidirectional controllable switch S14Fifteenth bidirectional controllable switch S15And sixteenth bidirectional controllable switch S16Thirteenth bidirectional controllable switch S13Has a first end connected to a first contact i, a thirteenth bidirectional controllable switch S13Second terminal and fourteenth bidirectional controllable switch S14Is connected to a fourteenth bidirectional controllable switch S14The 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 S15A first end of the first bi-directional controllable switch is connected to a first contact point i, and a fifteenth bi-directional controllable switch S15Is connected to a sixteenth bidirectional controllable switch S16The sixteenth bidirectional controllable switch S16Is connected to the first output terminal j of the third bidirectional controllable voltage-multiplying circuit, and a fifth charging capacitor C6Has one end connected to the first contact i and the fifth charging capacitor C6The 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 a sixth charging capacitor C7One end of the first capacitor is a first output end j of a third bidirectional controllable voltage-multiplying circuit, and a seventh charging capacitor C7The other end of the first switch is connected with a fourteenth bidirectional controllable switch S14The first end of (a).
The voltage division feedback circuit 2 comprises a first voltage division resistor R2And a second voltage dividing resistor R3First divider resistor R2Has one end connected to the fourth access end d of the first bidirectional controllable voltage-multiplying circuit, and a first voltage-dividing resistor R2And the other end of the first resistor and a second voltage-dividing resistor R3Is connected to one end of a second divider resistor R3One end of the second voltage dividing resistor R is also connected with the control and acquisition module3Is connected to the first output terminal j of the third bidirectional controllable voltage-multiplying circuit
The filter circuit 3 comprises a second resistor R4And a first capacitor C8First capacitor C8Has one end connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit and the first capacitor C8The 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 a second resistor R4Is connected to the first output terminal j of the third bidirectional controllable voltage-multiplying circuitTwo resistors R4The other end of the first resistor R is connected to a ninth input terminal k of the voltage acquisition module 4 and a first resistor R7Has one end connected to the fourth connection end d of the first bidirectional controllable voltage-multiplying circuit, and a first resistor R7And the other end thereof is connected to a tenth input terminal n of the voltage acquisition module 4. The voltage acquisition module 4 comprises a third voltage dividing resistor R5And a fourth voltage dividing resistor R6Third voltage dividing resistor R5Is a ninth input terminal k of the voltage acquisition module 4, and a third voltage dividing resistor R5And the other end of the fourth voltage dividing resistor R6Is connected to a third voltage dividing resistor R5The other end of the voltage divider is also connected with a control and acquisition module, and a fourth voltage dividing resistor R6The other end of the voltage acquisition module 4 is a tenth input end n of the voltage acquisition module and a cable capacitor C9One end of the voltage acquisition module 4 is connected with a ninth input end k and a cable capacitor C9The 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 energy storage capacitor C1An 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 voltage withstanding 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 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 an FPGA control chip, the three a/D converters are all connected with 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 the inversion signal to the high-frequency reverse circuit 5 and a photoelectric signal converter for transmitting the 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. And are neither required nor 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 (10)
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 C9Voltage acquisition module, current signal collector and first resistor R7And 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 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 R7And cable capacitance C9The rear part is connected in parallel to the voltage division feedback circuit, the voltage acquisition module and the cable capacitor C9Connected in parallel, the current signal collector and the first resistor R7The voltage division branch feed circuit, the current signal collector and the voltage collection module are connected in parallel with the control and collection moduleThe modules are connected.
2. A high voltage generator for insulation testing of distribution cables according to claim 1, characterized in that: the rectification charging circuit comprises a power frequency power supply U and a first diode D1A second diode D2A third diode D3A fourth diode D4Charging resistor R1And an energy storage capacitor C1The first diode D1A second diode D2A third diode D3And a fourth diode D4Forming a bridge rectifier circuit, one end of the power frequency power supply U and the first diode D1The other end of the power frequency power supply U is connected with the third diode D3The positive pole of the charging resistor R is connected1Is connected to the fourth diode D4The positive electrode of (1), the charging resistor R1The other end of the second input end b is connected with the second input end b of the high-frequency inverter circuit, and the energy storage capacitor C1Is connected with the first input end a of the high-frequency inverter circuit, and the energy storage capacitor C1And the other end of the second input end b is connected with the second input end b of the high-frequency inverter circuit.
3. A high voltage generator for insulation testing of distribution cables according to claim 2, characterized in that: the high-frequency inverter circuit comprises a first bidirectional controllable switch S1A second bidirectional controllable switch S2And a third bidirectional controllable switch S3And a fourth bidirectional controllable switch S4Said first bidirectional controllable switch S1First terminal of and the fourth bidirectional controllable switch S4Is connected to the second terminal of the fourth bidirectional controllable switch S4First terminal of and the third bidirectional controllable switch S3Is connected to the first terminal of the third bidirectional controllable switch S3And the second end of the second bidirectional controllable switch S2Is connected to the first terminal of the first bidirectional controllable switch S2And the second terminal of the first bidirectional controllable switch S1Is connected to the second terminal of the first bidirectional controllable switch S1To (1) aTwo ends and the second bidirectional controllable switch S2The second end of the third bidirectional controllable switch S is a first input end a of the high-frequency inverter circuit3First terminal of and the fourth bidirectional controllable switch S4The 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 circuit2The other end of the low-voltage side of the high-frequency transformer T is connected with the fourth bidirectional controllable switch S4The second end of (a).
4. A high voltage generator for insulation testing of distribution cables according to claim 3, characterized in that: 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 into 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 into a fourth connection end d of the first bidirectional controllable voltage doubling circuit, the first bidirectional controllable voltage doubling circuit is connected into the second bidirectional controllable voltage doubling circuit in parallel, and the second bidirectional controllable voltage doubling circuit is connected into the third bidirectional controllable voltage doubling circuit in parallel.
5. A high voltage generator for insulation testing of distribution cables according to claim 4, characterized in that: the first bidirectional controllable voltage-multiplying circuit comprises a first charging capacitor C2A second charging capacitor C3The fifth bidirectional controllable switch S5Sixth bidirectional controllable switch S6Seventh bidirectional controllable switch S7And an eighth bidirectional controllable switch S8Said fifth bidirectional controllable switch S5The 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 S5And the second end of the sixth bidirectional controllable switch S6Is connected to the sixth bidirectional controllable switch S6The first end of the first bi-directional controllable voltage-multiplying circuit is a fourth access end d of the first bi-directional controllable voltage-multiplying circuitSaid seventh bidirectional controllable switch S7The 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 S7Second end of the first bidirectional controllable switch S is connected with the eighth bidirectional controllable switch S8The eighth bidirectional controllable switch S8The first end of the first capacitor C is connected to the sixth connection end f of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C2Is connected to a fifth connection end e of the second bidirectional controllable voltage-multiplying circuit, and the first charging capacitor C2The 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 C3Is connected to a sixth connection end f of the second bidirectional controllable voltage-multiplying circuit, and the second charging capacitor C3Is connected to the sixth bidirectional controllable switch S6The first end of (a).
6. A high voltage generator for insulation testing of distribution cables according to claim 5, characterized in that: the second bidirectional controllable voltage-multiplying circuit comprises a third charging capacitor C4A fourth charging capacitor C5Ninth bidirectional controllable switch S9The tenth bidirectional controllable switch S10Eleventh bidirectional controllable switch S11And a twelfth bidirectional controllable switch S12The ninth bidirectional controllable switch S9The 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 S9And the second terminal of the first bi-directional controllable switch S10Is connected to the tenth bidirectional controllable switch S10The 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 S11Is connected to a seventh connection end g of a third bidirectional controllable voltage-multiplying circuit, and the eleventh bidirectional controllable switch S11Second end of the first bidirectional controllable switch S is connected with the twelfth bidirectional controllable switch S12The twelfth bidirectional controllable switch S12The 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 C4One end of (A) is connected toA seventh access end g of the third bidirectional controllable voltage-multiplying circuit, and a third charging capacitor C4The 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 C5Is connected to the eighth connection end h of the third bidirectional controllable voltage-multiplying circuit, and the fourth charging capacitor C5Is connected to the tenth bidirectional controllable switch S at the other end10The first end of (a).
7. A high voltage generator for insulation testing of distribution cables according to claim 4, characterized in that: the third bidirectional controllable voltage-multiplying circuit comprises a fifth charging capacitor C6A sixth charging capacitor C7Thirteenth bidirectional controllable switch S13Fourteenth bidirectional controllable switch S14Fifteenth bidirectional controllable switch S15And sixteenth bidirectional controllable switch S16Said thirteenth bidirectional controllable switch S13Is connected to a first contact i, the thirteenth bidirectional controllable switch S13And the fourteenth bidirectional controllable switch S14Is connected to the fourteenth bidirectional controllable switch S14The 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 S15A first end of the first switch is connected to a first contact point i, and the fifteenth bidirectional controllable switch S15The second end of the first bidirectional controllable switch is connected with the sixteenth bidirectional controllable switch S16The sixteenth bidirectional controllable switch S16A 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 C6Is connected to a first contact i, the fifth charging capacitor C6The 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 C7Is the first output terminal j of the third bidirectional controllable voltage-multiplying circuit, and the seventh charging capacitor C7Is connected to the fourteenth bidirectional controllable switch S14The first end of (a).
8. The method of claim 7A high voltage generator for distribution cable insulation test, its characterized in that: the voltage division feedback circuit comprises a first voltage division resistor R2And a second voltage dividing resistor R3Said first divider resistor R2One 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 R2And the other end of the second voltage-dividing resistor R3Is connected to one end of the second voltage-dividing resistor R3Is further connected with the control and acquisition module, and the second voltage-dividing resistor R3And 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.
9. A high voltage generator for insulation testing of distribution cables according to claim 8, characterized in that: the filter circuit comprises a second resistor R4And a first capacitor C8Said first capacitor C8One end of the first capacitor C is connected to the first output end j of the third bidirectional controllable voltage-multiplying circuit8The 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 R4One 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 R4The other end of the first resistor R is connected to a ninth input end k of the voltage acquisition module, and the first resistor R7One end of the first bi-directional controllable voltage-multiplying circuit is connected to the fourth connecting end d of the first bi-directional controllable voltage-multiplying circuit, and the first resistor R7And the other end of the second switch is connected to a tenth input end n of the voltage acquisition module.
10. A high voltage generator for insulation testing of distribution cables according to claim 9, characterized in that: the voltage acquisition module comprises a third voltage dividing resistor R5And a fourth voltage dividing resistor R6Said third voltage dividing resistor R5Is the ninth input terminal k of the voltage acquisition module, and the third voltage dividing resistor R5And the other end of the fourth voltage dividing resistor R6Is connected to the third voltage dividing resistor R5And the other end of the control and acquisition moduleConnected, said fourth voltage dividing resistor R6The other end of the voltage acquisition module is a tenth input end n of the voltage acquisition module, and the cable capacitor C9One end of the voltage acquisition module is connected to a ninth input end k of the voltage acquisition module, and the cable capacitor C9The other end is connected to a tenth input end n of the voltage acquisition module.
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| CN113295964A (en) * | 2021-05-21 | 2021-08-24 | 广东电网有限责任公司 | Power supply circuit for cable comprehensive test |
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