CN116148538B - Direct-current high-voltage insulation detection system and detection method - Google Patents
Direct-current high-voltage insulation detection system and detection method Download PDFInfo
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- CN116148538B CN116148538B CN202310416558.7A CN202310416558A CN116148538B CN 116148538 B CN116148538 B CN 116148538B CN 202310416558 A CN202310416558 A CN 202310416558A CN 116148538 B CN116148538 B CN 116148538B
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- 238000009413 insulation Methods 0.000 title claims abstract description 222
- 238000001514 detection method Methods 0.000 title claims abstract description 70
- 238000005070 sampling Methods 0.000 claims abstract description 263
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- 230000005540 biological transmission Effects 0.000 claims description 8
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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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The application provides a direct-current high-voltage insulation detection system and a detection method, relates to the technical field of insulation detection of direct-current high-voltage power supply, solves the problem of insulation resistance reduction caused by cable aging or breakage, and is used for underwater equipment. The detection method comprises the following steps: collecting a third positive phase sampling voltage output by the positive bridge arm voltage amplifying circuit and a third negative phase sampling voltage output by the negative bridge arm voltage amplifying circuit to obtain total voltages of the positive bridge arm and the negative bridge arm; obtaining high-voltage sampling voltages of a positive bridge arm, a negative bridge arm and a center tap; determining respective insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap according to the total voltage of the positive bridge arm and the negative bridge arm and the high-voltage sampling voltage of the positive bridge arm, the negative bridge arm and the center tap; comparing insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap with a reference threshold value; and under the condition that the insulation resistance value of any one of the positive bridge arm, the negative bridge arm and the center tap is lower than a reference threshold value, turning off the direct-current high-voltage power supply of the direct-current high-voltage insulation detection system.
Description
Technical Field
The application relates to the technical field of insulation detection of direct-current high-voltage power supply, in particular to a direct-current high-voltage insulation detection system and a detection method.
Background
In most of the existing underwater robot bodies, two power supply modes are mainly available, one is that a high-voltage umbilical cable is used for supplying power through power supply equipment connected with the shore, the other is that the high-voltage umbilical cable is used for charging through an internal battery, and the power supply is basically performed by adopting direct-current high voltage for the body supplied by the power supply equipment on the shore, so that the power supply voltages of the underwater robots of different depths are different due to different umbilical cables.
In the process of supplying power to underwater equipment, because the use environment of the umbilical cable of the on-shore high-voltage direct current power supply equipment and the underwater body is relatively bad, unexpected emergencies such as stranded cable, cable scratch, abrasion, seawater oversoaking and the like can be encountered in the process of collecting the underwater body, accelerated aging and damage of the umbilical cable can be caused, if the cable is overaged and damaged, the insulation resistance of the on-shore equipment and the underwater body can be drastically reduced, even a short circuit phenomenon is caused, thereby the personal safety of operators can be influenced, and the underwater body can be burnt.
The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve at least one of the above problems, the present application provides a dc high voltage insulation detection system and a detection method.
According to a first aspect of the present application, a method for detecting dc high voltage insulation is provided, for use in an MCU controller, the method comprising:
collecting a third positive phase sampling voltage output by the positive bridge arm voltage amplifying circuit and a third negative phase sampling voltage output by the negative bridge arm voltage amplifying circuit to obtain total voltages of the positive bridge arm and the negative bridge arm;
acquiring high-voltage sampling voltages of the positive bridge arm, the negative bridge arm and a center tap;
determining respective insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap according to the total voltage of the positive bridge arm and the negative bridge arm and the high-voltage sampling voltage of the positive bridge arm, the negative bridge arm and the center tap;
comparing insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap with a reference threshold value;
and under the condition that the insulation resistance value of any one of the positive bridge arm, the negative bridge arm and the center tap is lower than the reference threshold value, turning off a direct-current high-voltage power supply of the direct-current high-voltage insulation detection system.
According to some embodiments, the collecting the third positive phase sampling voltage output by the positive bridge arm voltage amplifying circuit and the third negative phase sampling voltage output by the negative bridge arm voltage amplifying circuit to obtain the total voltage of the positive bridge arm and the negative bridge arm includes:
According to the third positive phase sampling voltage, obtaining a total voltage of a positive bridge arm:
wherein U is + U is the total voltage of the positive bridge arm x2 And sampling the voltage for the third normal phase, wherein a is a first parameter, and b is a second parameter.
According to some embodiments, the collecting the third positive phase sampling voltage output by the positive bridge arm voltage amplifying circuit and the third negative phase sampling voltage output by the negative bridge arm voltage amplifying circuit to obtain the total voltage of the positive bridge arm and the negative bridge arm includes:
according to the third negative phase sampling voltage, obtaining a negative bridge arm total voltage:
wherein U is - U is the total voltage of the negative bridge arm y2 And sampling the voltage for the third negative phase, wherein c is a third parameter, and d is a fourth parameter.
According to some embodiments, the positive bridge arm light-operated MOS gating circuit includes a first switch and a first MOS driving circuit, the center tap light-operated MOS gating circuit includes a second switch and a second MOS driving circuit, the negative bridge arm light-operated MOS gating circuit includes a third switch and a third MOS driving circuit, the obtaining the high voltage sampling voltages of the positive bridge arm, the negative bridge arm and the center tap includes:
controlling the first MOS driving circuit to drive the first switch to be closed at a set end, and acquiring the high-voltage sampling voltage of the positive bridge arm;
Controlling the second MOS driving circuit to drive the second switch to be closed at a set end, and obtaining the high-voltage sampling voltage of the center tap;
and controlling the third MOS driving circuit to drive the third switch to be closed at a set end, and obtaining the high-voltage sampling voltage of the negative bridge arm.
According to a second aspect of the present application, a dc high voltage insulation detection system is provided, the dc high voltage insulation detection system includes a positive bridge arm bus insulation sampling module, a negative bridge arm bus insulation sampling module, a center tap bus insulation sampling module, a positive bridge arm light-operated MOS gate circuit, a negative bridge arm light-operated MOS gate circuit, a center tap light-operated MOS gate circuit, a positive bridge arm voltage amplifying circuit, a negative bridge arm voltage amplifying circuit, a center tap sampling voltage amplifying circuit, and an MCU controller, wherein:
the positive bridge arm bus insulation sampling module is connected with a positive phase bus end of a tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus high voltage of a positive bridge arm to obtain a positive phase sampling voltage;
the negative bridge arm bus insulation sampling module is connected with a negative phase bus end of a tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus high voltage of the negative bridge arm to obtain a negative phase sampling voltage;
The center tap bus insulation sampling module is connected with a zero volt bus end of a tested direct current high voltage bus and is used for carrying out partial pressure sampling on the high voltage of the bus when the center tap is biased upwards or downwards in direct current high voltage so as to obtain zero volt point sampling voltage;
the positive bridge arm light-controlled MOS gating circuit is used for gating the positive phase sampling voltage of the positive bridge arm bus insulation sampling module and performing second partial pressure sampling on the positive phase sampling voltage to obtain a second positive phase sampling voltage;
the negative bridge arm light-operated MOS gating circuit is used for gating the negative phase sampling voltage of the negative bridge arm bus insulation sampling module and performing second partial pressure sampling on the negative phase sampling voltage to obtain a second negative phase sampling voltage;
the center tap light-operated MOS gating circuit is used for gating the zero volt point sampling voltage of the center tap bus insulation sampling module and performing partial pressure sampling on the zero volt point sampling voltage to obtain a second zero volt point sampling voltage;
the positive bridge arm voltage amplifying circuit is connected with the positive bridge arm light-controlled MOS gating circuit and is used for amplifying and filtering the second positive phase sampling voltage output by the positive bridge arm light-controlled MOS gating circuit to obtain a high-voltage sampling voltage of a positive bridge arm;
The negative bridge arm voltage amplifying circuit is connected with the negative bridge arm light-operated MOS gating circuit and is used for amplifying, filtering and reversing the second negative phase sampling voltage output by the negative bridge arm light-operated MOS gating circuit to obtain a high-voltage sampling voltage of a negative bridge arm;
the center tap sampling voltage amplifying circuit is connected with the center tap light-operated MOS gating circuit and is used for amplifying, filtering and reversing the second zero volt point sampling voltage output by the center tap light-operated MOS gating circuit to obtain a high-voltage sampling voltage of a center tap;
the MCU controller is configured to perform the dc high voltage insulation detection method according to any one of the first aspects.
According to some embodiments, the direct current high voltage insulation detection system further comprises a CAN transparent transmission module and an insulation state display module:
the CAN transparent transmission module is used for forwarding the insulation resistance value obtained by the MCU controller to water equipment under the condition that the insulation resistance value of any one of the positive bridge arm, the negative bridge arm and the center tap is lower than the reference threshold value;
the insulation state display module is connected with the MCU controller and used for displaying an insulation detection state according to the insulation resistance value of the positive bridge arm, the negative bridge arm or the center tap.
According to some embodiments, the dc high voltage insulation detection system further includes a power supply executing unit, configured to turn off a dc high voltage power supply of the dc high voltage insulation detection system when an insulation resistance value of any one of the positive bridge arm, the negative bridge arm, and the center tap is lower than the reference threshold value.
According to some embodiments, the positive bridge arm bus insulation sampling module includes a first resistorThe first resistor is connected with one end of the second resistor and then grounded; one end of the first resistor is connected with one ends of the third resistor and the tenth resistor in series; the other end of the tenth resistor is connected with the positive bridge arm light-operated MOS gating circuit in series, and then is connected with one end of the eleventh resistor, and the other end of the eleventh resistor is grounded, wherein:
wherein U is + U is the total voltage of the positive bridge arm x2 Sampling a voltage for the third normal phase, R 1 R is the resistance of the first resistor 2 R is the resistance of the second resistor 3 R is the resistance of the third resistor 10 R is the resistance of the tenth resistor 11 Is the resistance of the eleventh resistor.
According to some embodiments, the negative bridge arm bus insulation sampling module comprises a seventh resistor, an eighth resistor, a ninth resistor, a fourteenth resistor and a fifteenth resistor, wherein one end of the eighth resistor is connected with one end of the seventh resistor and then grounded; one end of the eighth resistor is connected with one ends of the ninth resistor and the fourteenth resistor in series; the other end of the fourteenth resistor is connected with the negative bridge arm light-operated MOS gating circuit in series, and then connected with one end of the fifteenth resistor, and the other end of the fifteenth resistor is grounded, wherein:
wherein U is - U is the total voltage of the negative bridge arm y2 Sampling a voltage for the third negative phase, R 7 For the seventh electricityResistance value of resistor R 8 R is the resistance of the eighth resistor 9 R is the resistance of the ninth resistor 14 R is the resistance of the fourteenth resistor 15 R is the resistance of the fifteenth resistor x R is the insulation resistance value of the positive bridge arm y The insulation resistance value of the negative bridge arm is U a For the high voltage sampling voltage of the positive bridge arm, U b And sampling voltage for the high voltage of the negative bridge arm.
According to some embodiments, the center tap bus insulation sampling module comprises a fourth resistor, a fifth resistor, a sixth resistor, a twelfth resistor and a thirteenth resistor, wherein one end of the fourth resistor is connected with one end of the fifth resistor and then grounded; one end of the fourth resistor is connected with one ends of the sixth resistor and the twelfth resistor in series; the other end of the twelfth resistor is connected in series with the center tap light-operated MOS gating circuit and then connected with one end of the thirteenth resistor, the other end of the thirteenth resistor is grounded, a direct-current voltage source is connected between the other end of the first resistor and the other end of the fourth resistor, and a direct-current voltage source is connected between the other end of the fourth resistor and the other end of the eighth resistor, wherein: 
Wherein R is 5 R is the resistance of the fifth resistor 6 R is the resistance of the sixth resistor 12 R is the resistance of the twelfth resistor 13 R is the resistance of the thirteenth resistor z For the insulation resistance value of the center tap, U c A voltage is sampled for the high voltage of the center tap.
The application provides a direct current high voltage insulation detection system and a detection method, wherein an insulation resistance of a high voltage bus is sampled by adopting an unbalanced resistance method through respectively controlling a positive bridge arm light-operated MOS gating circuit, a negative bridge arm light-operated MOS gating circuit and a center tap light-operated MOS gating circuit, and an insulation resistance value of the positive bridge arm direct current high voltage bus, an insulation resistance value of the negative bridge arm direct current high voltage bus and an insulation resistance value of the center tap direct current high voltage bus are accurately calculated through a sampled result. The MCU controller compares the insulation resistance value of the positive bridge arm direct current high-voltage bus, the insulation resistance value of the negative bridge arm direct current high-voltage bus and the insulation resistance value of the center tap direct current high-voltage bus with a safety threshold, and under the condition that any one of the insulation resistance values is lower than the safety threshold, the insulation state display module of the direct current high-voltage insulation detection system can display the insulation detection state of the system in real time, so that a user can observe the insulation detection state of the system in real time, and the safety guarantee of the operation user can be improved: through the relevant information that shows on insulating state display module to operating personnel prejudges the insulating detection state of underwater equipment, under the condition that the insulating resistance value that direct current high voltage insulation detecting system detected was too low, can cause the power short circuit to turn off, operating personnel can in time retrieve the underwater equipment body of laying in the distance.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are only some of the embodiments of the present application and are not intended to limit the present application.
FIG. 1 illustrates a schematic diagram of a DC high voltage insulation detection system according to an exemplary embodiment;
FIG. 2 shows a schematic circuit diagram of a DC high voltage insulation detection system according to an exemplary embodiment;
fig. 3 shows a flow chart of a dc high voltage insulation detection method according to an exemplary embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, materials, apparatus, etc. In these instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Those skilled in the art will appreciate that the drawings are schematic representations of example embodiments, and that the modules or flows in the drawings are not necessarily required to practice the present application, and therefore, should not be taken to limit the scope of the present application.
Fig. 1 shows a schematic diagram of a dc high voltage insulation detection system according to an exemplary embodiment.
Referring to fig. 1, the direct current high voltage insulation detection system comprises a positive bridge arm bus insulation sampling module, a negative bridge arm bus insulation sampling module, a center tap bus insulation sampling module, a positive bridge arm light-operated MOS gating circuit, a negative bridge arm light-operated MOS gating circuit, a center tap light-operated MOS gating circuit, a positive bridge arm voltage amplifying circuit, a negative bridge arm voltage amplifying circuit, a center tap sampling voltage amplifying circuit and an MCU controller.
The positive bridge arm bus insulation sampling module is connected with a positive phase bus end of the tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus high voltage of the positive bridge arm to obtain positive phase sampling voltage.
The negative bridge arm bus insulation sampling module is connected with a negative phase bus end of the tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus high voltage of the negative bridge arm to obtain negative phase sampling voltage.
The center tap bus insulation sampling module is connected with a zero volt bus end of the tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus high voltage when the center tap is biased upwards or downwards in the direct current high voltage so as to obtain a zero volt point sampling voltage.
The positive bridge arm light-operated MOS gating circuit is used for acquiring positive sampling voltage of the positive bridge arm bus insulation sampling module, and performing first partial pressure sampling on the positive sampling voltage to obtain a first positive sampling voltage.
The negative bridge arm light-operated MOS gating circuit is used for acquiring the negative phase sampling voltage of the negative bridge arm bus insulation sampling module, and performing first partial pressure sampling on the negative phase sampling voltage to obtain a first negative phase sampling voltage.
The positive bridge arm voltage amplifying circuit is connected with the positive bridge arm light-controlled MOS gating circuit and is used for amplifying and filtering the first positive phase sampling voltage output by the positive bridge arm light-controlled MOS gating circuit to obtain a third positive phase sampling voltage.
The negative bridge arm voltage amplifying circuit is connected with the negative bridge arm light-operated MOS gating circuit and is used for amplifying, filtering and reversing the first negative phase sampling voltage output by the negative bridge arm light-operated MOS gating circuit to obtain a third negative phase sampling voltage.
The positive bridge arm light-operated MOS gating circuit is also used for gating the positive phase sampling voltage of the positive bridge arm bus insulation sampling module and performing second partial pressure sampling on the positive phase sampling voltage to obtain a second positive phase sampling voltage.
The negative bridge arm light-operated MOS gating circuit is also used for gating the negative phase sampling voltage of the negative bridge arm bus insulation sampling module and performing second partial pressure sampling on the negative phase sampling voltage to obtain a second negative phase sampling voltage.
The center tap light-operated MOS gating circuit is also used for gating the zero volt point sampling voltage of the center tap bus insulation sampling module and performing partial pressure sampling on the zero volt point sampling voltage to obtain a second zero volt point sampling voltage.
The positive bridge arm voltage amplifying circuit is connected with the positive bridge arm light-controlled MOS gating circuit and is also used for amplifying and filtering the second positive phase sampling voltage output by the positive bridge arm light-controlled MOS gating circuit to obtain the high-voltage sampling voltage of the positive bridge arm.
The negative bridge arm voltage amplifying circuit is connected with the negative bridge arm light-operated MOS gating circuit and is also used for amplifying, filtering and reversing the second negative phase sampling voltage output by the negative bridge arm light-operated MOS gating circuit to obtain the high-voltage sampling voltage of the negative bridge arm.
The center tap sampling voltage amplifying circuit is connected with the center tap light-operated MOS gating circuit and is also used for amplifying, filtering and reversing the second zero volt point sampling voltage output by the center tap light-operated MOS gating circuit to obtain the high-voltage sampling voltage of the center tap.
And the MCU is used for acquiring a third positive phase sampling voltage, a third negative phase sampling voltage, a high-voltage sampling voltage of the positive bridge arm, a high-voltage sampling voltage of the negative bridge arm and a high-voltage sampling voltage of the center tap, and determining an insulation resistance value of the positive bridge arm, an insulation resistance value of the negative bridge arm and an insulation resistance value of the center tap according to the acquired third positive phase sampling voltage, the acquired third negative phase sampling voltage, the acquired high-voltage sampling voltage of the positive bridge arm, the acquired high-voltage sampling voltage of the negative bridge arm and the acquired high-voltage sampling voltage of the center tap.
According to an example embodiment, the direct current high voltage insulation detection system further comprises a CAN transparent transmission module and an insulation state display module.
The MCU controller is also used for comparing the insulation resistance value of the positive bridge arm, the insulation resistance value of the negative bridge arm and the insulation resistance value of the center tap with a reference threshold value.
The CAN transparent transmission module is used for forwarding the insulation resistance value obtained by the MCU controller to water equipment (such as on-shore power supply equipment) under the condition that the insulation resistance value of any one of the positive bridge arm, the negative bridge arm and the center tap is lower than a reference threshold value. In the method, the underwater robot is taken as an example, under the condition that an umbilical cable is worn, the MCU controller determines that the insulation resistance value of a positive bridge arm, the insulation resistance value of a negative bridge arm or the insulation resistance value of a center tap of the underwater robot is lower than a reference threshold value according to calculation, and then the information is sent to water equipment (such as on-shore power supply equipment) through the CAN transparent transmission module.
The insulation state display module is connected with the MCU controller and used for displaying the insulation detection state according to the insulation resistance value of the positive bridge arm, the insulation resistance value of the negative bridge arm or the insulation resistance value of the center tap obtained by the MCU controller.
According to an example embodiment, the dc high voltage insulation detection system further comprises a power supply execution unit. The power supply execution unit comprises a direct-current high-voltage power supply. The power supply executing unit is used for turning off the direct-current high-voltage power supply of the direct-current high-voltage insulation detection system and stopping power supply under the condition that the insulation resistance value of any one of the positive bridge arm, the negative bridge arm and the center tap is lower than a reference threshold value.
According to an example embodiment, the direct current high voltage insulation detection system further comprises a detection address module. The detection address module is used for determining the direct current high voltage grade of the underwater equipment (such as the underwater robot), and the high voltage bus insulation sampling module with a corresponding voltage value is selected according to the grade of the applicable direct current high voltage of the underwater equipment so as to be convenient for an operator to replace and install. The direct-current high-voltage insulation detection system can also automatically judge a direct-current high-voltage scene applied by the current equipment according to the bit selection address, and collect the insulation resistance value on the current bus.
As shown in fig. 1, the DC high-voltage insulation detection system may select a dc±400V high-voltage bus insulation sampling module, a dc±800V high-voltage bus insulation sampling module, or a dc±1000V high-voltage bus insulation sampling module according to a voltage level, where each of the high-voltage bus insulation sampling modules includes a positive bridge arm bus insulation sampling module, a negative bridge arm bus insulation sampling module, and a center tap bus insulation sampling module. The application only uses a DC high-voltage insulation detection system to select a DC +/-400V high-voltage bus insulation sampling module as an example for description.
The application provides a direct current high voltage insulation detecting system, through controlling positive bridge arm light-operated MOS gating circuit, negative bridge arm light-operated MOS gating circuit, center tap light-operated MOS gating circuit respectively, adopt unbalanced resistance method to sample the insulation resistance of high voltage bus, through the result after the sampling, the insulation resistance value of positive bridge arm direct current high voltage bus, the insulation resistance value of negative bridge arm direct current high voltage bus and the insulation resistance value of center tap direct current high voltage bus are calculated accurately. The MCU controller compares the insulation resistance value of the positive bridge arm direct current high-voltage bus, the insulation resistance value of the negative bridge arm direct current high-voltage bus and the insulation resistance value of the center tap direct current high-voltage bus with a safety threshold, and under the condition that any one of the insulation resistance values is lower than the safety threshold, the insulation state display module of the direct current high-voltage insulation detection system can display the insulation detection state of the system in real time, so that a user can observe the insulation detection state of the system in real time, and the safety guarantee of the operation user can be improved: through the relevant information that shows on insulating state display module to operating personnel prejudges the insulating detection state of underwater equipment, under the condition that the insulating resistance value that direct current high voltage insulation detecting system detected was too low, can cause the power short circuit to turn off, operating personnel can in time retrieve the underwater equipment body of laying in the distance.
Fig. 2 shows a schematic circuit structure of a dc high voltage insulation detection system according to an exemplary embodiment.
As shown in fig. 2, the positive bridge arm bus insulation sampling module includes a first resistor R1, a second resistor R2, a third resistor R3, a tenth resistor R10, and an eleventh resistor R11. The positive bridge arm light-operated MOS gating circuit comprises a first MOS driving circuit 101 and a first switch S1. The positive leg voltage amplification circuit includes a first amplifier 102 and a first buffer 103.
The first resistor R1 is connected with the second resistor R2 in series and then grounded. The first resistor R1 is connected in series with the third resistor R3 and the tenth resistor R10, and then is connected in series with the first switch S1. The 1 terminal of the first switch S1 is connected in series to the eleventh resistor R11 and then grounded. The 1 end of the first switch S1 is further connected in series with a first amplifier 102, and the first buffer 103 is connected in series with an MCU controller. The 2 end of the first switch S1 is connected in series with the first MOS driving circuit 101 and then connected with the MCU controller. The first resistor R1 and the second resistor R2 are used for dividing the bus high voltage of the positive bridge arm.
The negative bridge arm bus insulation sampling module comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourteenth resistor R14 and a fifteenth resistor R15. The negative bridge arm light-operated MOS gate circuit includes a third MOS drive circuit 301 and a third switch S3. The negative leg voltage amplification circuit includes a third amplifier 302 and a third buffer 303.
The eighth resistor R8 is connected in series with the seventh resistor R7 and then grounded. The eighth resistor R8 is connected in series with the ninth resistor R9 and the fourteenth resistor R14, and then is connected in series with the third switch S3. The 1 end of the third switch S3 is connected in series with the fifteenth resistor R15 and then grounded. The 1 end of the third switch S3 is further connected in series to a third amplifier 302, and the third buffer 303 is connected in series to the MCU controller. The end 2 of the third switch S3 is connected in series to the third MOS driving circuit 301 and then connected in series to the MCU controller. The seventh resistor R7 and the eighth resistor R8 are used for dividing the bus high voltage of the negative bridge arm.
The center tap bus insulation sampling module comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a twelfth resistor R12 and a thirteenth resistor R13. The center tap photo-controlled MOS gate circuit includes a second MOS drive circuit 201 and a second switch S2. The center tap sampling voltage amplifying circuit includes a second amplifier 202 and a second buffer 203.
The fourth resistor R4 is connected in series with the fifth resistor R5 and then grounded. The fourth resistor R4 is connected in series with the sixth resistor R6 and the twelfth resistor R12, and then is connected in series with the second switch S2. The 1 end of the second switch S2 is connected in series to the thirteenth resistor R13 and then grounded. The 1 end of the second switch S2 is further connected in series with a second amplifier 202, and the second buffer 203 is connected in series with an MCU controller. The 2 end of the second switch S2 is connected in series to the second MOS driving circuit 201 and then connected in series to the MCU controller. The fourth resistor R4 and the fifth resistor R5 are used for dividing the bus high voltage of the center tap.
The positive bridge arm light-operated MOS gating circuit gating positive bridge arm bus insulation sampling module refers to that the first MOS driving circuit 101 controls the first switch S1 to be connected from the 2 end to the 1 end.
The negative bridge arm light-operated MOS gating circuit gating negative bridge arm bus insulation sampling module means that the third MOS driving circuit 301 controls the third switch S3 to be connected from the 2 end to the 1 end.
The center tap light-operated MOS gating circuit gates the center tap bus insulation sampling module, which means that the second MOS driving circuit 201 controls the second switch S2 to be connected from the 2 end to the 1 end.
A direct-current voltage source is connected in series between the first resistor R1 and the fourth resistor R4, and a direct-current voltage source is connected in series between the fourth resistor R4 and the eighth resistor R8.
According to an example embodiment, the dc high voltage insulation detection system further includes a twentieth resistor R20. The twentieth resistor R20 has one end connected to the PE end and the other end connected to ground.
Fig. 3 shows a flow chart of a dc high voltage insulation detection method according to an exemplary embodiment.
As shown, the method includes steps S301-S305.
In step S301, a third positive phase sample voltage and a third negative phase sample voltage are acquired.
According to an exemplary embodiment, the first switch S1 is closed at the 1 terminal of the first switch, the second switch S2 is closed at the 1 terminal of the second switch, and the third switch S3 is closed at the 1 terminal of the third switch, respectively. The positive bridge arm bus insulation sampling module is connected with a positive phase bus end of a tested direct current high voltage bus, and divides and samples the bus high voltage of the positive bridge arm to obtain a positive phase sampling voltage U x0 . The negative bridge arm bus insulation sampling module is connected with a negative phase bus end of a tested direct current high voltage bus, and performs partial pressure sampling on the bus high voltage of the negative bridge arm to obtain a negative phase sampling voltage U y0 . The central tap bus insulation sampling module is connected with a zero volt bus end of a tested direct current high voltage bus, and the central tap performs partial pressure sampling on the bus high voltage when the direct current high voltage is biased upwards or downwards to obtain a zero volt point sampling voltage U z0 。
Positive bridge arm light-operated MOS gating powerPositive sampling voltage U of positive bridge arm bus insulation sampling module is obtained on way x0 And samples the voltage U in the normal phase x0 Performing first partial pressure sampling to obtain a first normal phase sampling voltage U x1 . The negative-phase sampling voltage U of the negative-bridge arm bus insulation sampling module is obtained by a negative-bridge arm light-operated MOS gating circuit y0 And samples the negative phase with the voltage U y0 Performing first partial pressure sampling to obtain a first negative phase sampling voltage U y1 。
The positive bridge arm voltage amplifying circuit is connected with the positive bridge arm light-controlled MOS gating circuit, and the first positive phase sampling voltage U output by the positive bridge arm light-controlled MOS gating circuit is used for sampling the positive bridge arm voltage x1 Amplifying and filtering to obtain a third normal phase sampling voltage U x2 . The negative bridge arm voltage amplifying circuit is connected with the negative bridge arm light-operated MOS gating circuit, and the first negative phase sampling voltage U output by the negative bridge arm light-operated MOS gating circuit y1 Amplifying, filtering and reversing to obtain a third negative phase sampling voltage U y2 。
In step S302, the total voltage of the positive leg and the negative leg is obtained.
The total voltage of the positive leg is obtained, for example, by the following formula.
The total voltage of the negative leg is obtained, for example, by the following formula.
According to an exemplary embodiment, the measured DC high voltage total voltage is replaced with U, and the measured positive bridge arm total voltage is replaced with U + Instead, the total voltage of the detected negative bridge arm is U - Instead, and u=u + +U - R can be obtained x 、R y Wherein R is a relation of x Is the insulation resistance value of the positive bridge arm, R y The insulation resistance value of the negative bridge arm.
According to an example embodiment, a positive bridge arm light-operated MOS gating circuit gates a positive sampling voltage U of a positive bridge arm bus insulation sampling module x0 That is, the first switch S1 is closed at the 1 terminal of the first switch, the second switch S2 is closed at the 2 terminal of the second switch, and the third switch S3 is closed at the 2 terminal of the third switch. Positive bridge arm light-operated MOS gating circuit is to normal phase sampling voltage U x0 Performing a second partial pressure sampling to obtain a second normal phase sampling voltage U a1 . The positive bridge arm voltage amplifying circuit samples the second positive phase sampling voltage U a1 Amplifying and filtering to obtain high-voltage sampling voltage U of the positive bridge arm a . The negative bridge arm direct current high voltage bus insulation sampling voltage and the center tap direct current high voltage bus insulation sampling voltage are grounded, so that the negative bridge arm direct current high voltage bus insulation sampling voltage and the center tap direct current high voltage bus insulation sampling voltage are zero volts. R can be obtained according to the following equation x 、R y And U a Is defined by the relation:
In step S304, insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap are determined according to the total voltage of the positive bridge arm and the negative bridge arm and the high-voltage sampling voltage of the positive bridge arm, the negative bridge arm and the center tap.
The insulation resistance value R of the positive bridge arm can be obtained according to the following four equations x ：
The insulation resistance value R of the negative bridge arm can be obtained according to the following four equations y ：
The insulation resistance value of the center tap can be obtained according to the following three equationsR z ：
In step S305, insulation resistance values of the positive arm, the negative arm, and the center tap are compared with a reference threshold value.
According to an example embodiment, the direct current high voltage insulation detection system determines whether the insulation resistance value is within a prescribed range by comparing the obtained insulation resistance value of the positive bridge arm, the insulation resistance value of the negative bridge arm, and the insulation resistance value of the center tap with a reference threshold value.
According to an example embodiment, if the insulation resistance value of any one of the positive bridge arm, the negative bridge arm and the center tap is lower than the reference threshold value, the insulation abnormality of the cable is indicated, and the MCU controller may send the real-time calculation result to the on-water equipment (for example, on-shore power supply equipment) through the CAN transparent transmission module. The MCU controller also sends the real-time calculation result to the insulation status display module to remind the operator to perform emergency treatment when necessary, for example, to turn off the dc high voltage power supply of the dc high voltage insulation detection system to protect the underwater equipment (such as the underwater robot).
The application provides a detection method of a direct current high voltage insulation system, which adopts an unbalanced resistance method to sample insulation resistance of a high voltage bus, and accurately calculates the insulation resistance value of a positive bridge arm direct current high voltage bus, the insulation resistance value of a negative bridge arm direct current high voltage bus and the insulation resistance value of a center tap direct current high voltage bus according to the sampled result. The MCU controller compares the insulation resistance value of the positive bridge arm direct current high-voltage bus, the insulation resistance value of the negative bridge arm direct current high-voltage bus and the insulation resistance value of the center tap direct current high-voltage bus with a safety threshold, and under the condition that any one of the insulation resistance values is lower than the safety threshold, the insulation state display module of the direct current high-voltage insulation detection system can display the insulation detection state of the system in real time, so that a user can observe the insulation detection state of the system in real time, and the safety guarantee of the operation user can be improved: through the relevant information that shows on insulating state display module to operating personnel prejudges the insulating detection state of underwater equipment, under the condition that the insulating resistance value that direct current high voltage insulation detecting system detected was too low, can cause the power short circuit to turn off, operating personnel can in time retrieve the underwater equipment body of laying in the distance.
It should be clearly understood that this application describes how to make and use particular examples, but is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Furthermore, it should be noted that the above-described figures are merely illustrative of the processes involved in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
Exemplary embodiments of the present application are specifically illustrated and described above. It is to be understood that this application is not limited to the details of construction, arrangement or method of implementation described herein; on the contrary, the application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (7)
1. The direct current high voltage insulation detection system is characterized by comprising a positive bridge arm bus insulation sampling module, a negative bridge arm bus insulation sampling module, a center tap bus insulation sampling module, a positive bridge arm light-operated MOS gating circuit, a negative bridge arm light-operated MOS gating circuit, a center tap light-operated MOS gating circuit, a positive bridge arm voltage amplifying circuit, a negative bridge arm voltage amplifying circuit, a center tap sampling voltage amplifying circuit and an MCU controller, wherein:
The positive bridge arm bus insulation sampling module is connected with a positive phase bus end of a tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus high voltage of a positive bridge arm to obtain a positive phase sampling voltage;
the negative bridge arm bus insulation sampling module is connected with a negative phase bus end of a tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus high voltage of the negative bridge arm to obtain a negative phase sampling voltage;
the center tap bus insulation sampling module is connected with a zero volt bus end of the tested direct current high voltage bus and is used for carrying out partial pressure sampling on the bus when the center tap is biased upwards or downwards in direct current high voltage so as to obtain zero volt point sampling voltage;
the positive bridge arm light-operated MOS gating circuit is used for acquiring the positive sampling voltage of the positive bridge arm bus insulation sampling module, and performing first partial pressure sampling on the positive sampling voltage to obtain a first positive sampling voltage;
the negative bridge arm light-operated MOS gating circuit is used for acquiring the negative phase sampling voltage of the negative bridge arm bus insulation sampling module and performing first partial pressure sampling on the negative phase sampling voltage to obtain a first negative phase sampling voltage;
the positive bridge arm voltage amplifying circuit is connected with the positive bridge arm light-controlled MOS gating circuit and is used for amplifying and filtering the first positive phase sampling voltage output by the positive bridge arm light-controlled MOS gating circuit to obtain a third positive phase sampling voltage;
The negative bridge arm voltage amplifying circuit is connected with the negative bridge arm light-operated MOS gating circuit and is used for amplifying, filtering and reversing the first negative phase sampling voltage output by the negative bridge arm light-operated MOS gating circuit to obtain a third negative phase sampling voltage;
the positive bridge arm light-controlled MOS gating circuit is used for gating the positive phase sampling voltage of the positive bridge arm bus insulation sampling module and performing second partial pressure sampling on the positive phase sampling voltage to obtain a second positive phase sampling voltage;
the negative bridge arm light-operated MOS gating circuit is used for gating the negative phase sampling voltage of the negative bridge arm bus insulation sampling module and performing second partial pressure sampling on the negative phase sampling voltage to obtain a second negative phase sampling voltage;
the center tap light-operated MOS gating circuit is used for gating the zero volt point sampling voltage of the center tap bus insulation sampling module, and performing second partial pressure sampling on the zero volt point sampling voltage to obtain a second zero volt point sampling voltage;
the positive bridge arm voltage amplifying circuit is connected with the positive bridge arm light-controlled MOS gating circuit and is used for amplifying and filtering the second positive phase sampling voltage output by the positive bridge arm light-controlled MOS gating circuit to obtain a high-voltage sampling voltage of a positive bridge arm;
The negative bridge arm voltage amplifying circuit is connected with the negative bridge arm light-operated MOS gating circuit and is used for amplifying, filtering and reversing the second negative phase sampling voltage output by the negative bridge arm light-operated MOS gating circuit to obtain a high-voltage sampling voltage of a negative bridge arm;
the center tap sampling voltage amplifying circuit is connected with the center tap light-operated MOS gating circuit and is used for amplifying, filtering and reversing the second zero volt point sampling voltage output by the center tap light-operated MOS gating circuit to obtain a high-voltage sampling voltage of a center tap;
the MCU controller is used for collecting the third positive phase sampling voltage, the third negative phase sampling voltage, the positive bridge arm, the negative bridge arm and the high-voltage sampling voltage of the center tap, and determining insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap according to the collected third positive phase sampling voltage, the third negative phase sampling voltage, the high-voltage sampling voltage of the positive bridge arm, the negative bridge arm and the center tap.
2. The direct current high voltage insulation detection system according to claim 1, further comprising a CAN transparent transmission module and an insulation state display module:
The CAN transparent transmission module is used for forwarding the insulation resistance value obtained by the MCU controller to equipment under the condition that the insulation resistance value of any one of the positive bridge arm, the negative bridge arm or the center tap is lower than a reference threshold value;
the insulation state display module is connected with the MCU controller and used for displaying an insulation detection state according to the insulation resistance value of the positive bridge arm, the negative bridge arm or the center tap.
3. The dc high voltage insulation detection system according to claim 2, further comprising a power supply executing unit for turning off the dc high voltage power supply of the dc high voltage insulation detection system in case an insulation resistance value of any one of the positive leg, the negative leg, or the center tap is lower than the reference threshold value.
4. The direct-current high-voltage insulation detection system according to claim 1, wherein the positive bridge arm bus insulation sampling module comprises a first resistor, a second resistor, a third resistor, a tenth resistor and an eleventh resistor, and one end of the first resistor is grounded after being connected with one end of the second resistor; one end of the first resistor is connected with one ends of the third resistor and the tenth resistor in series; the other end of the tenth resistor is connected with the positive bridge arm light-operated MOS gating circuit in series, and then is connected with one end of the eleventh resistor, and the other end of the eleventh resistor is grounded, wherein:
Wherein U is + U is the total voltage of the positive bridge arm x2 Sampling a voltage for the third normal phase, R 1 R is the resistance of the first resistor 2 R is the resistance of the second resistor 3 R is the resistance of the third resistor 10 R is the resistance of the tenth resistor 11 Is the resistance of the eleventh resistor.
5. The direct-current high-voltage insulation detection system of claim 4, wherein the negative bridge arm bus insulation sampling module comprises a seventh resistor, an eighth resistor, a ninth resistor, a fourteenth resistor and a fifteenth resistor, and one end of the eighth resistor is grounded after being connected with one end of the seventh resistor; one end of the eighth resistor is connected with one ends of the ninth resistor and the fourteenth resistor in series; the other end of the fourteenth resistor is connected with the negative bridge arm light-operated MOS gating circuit in series, and then connected with one end of the fifteenth resistor, and the other end of the fifteenth resistor is grounded, wherein:
wherein U is - U is the total voltage of the negative bridge arm y2 Sampling a voltage for the third negative phase, R 7 R is the resistance of the seventh resistor 8 R is the resistance of the eighth resistor 9 R is the resistance of the ninth resistor 14 R is the resistance of the fourteenth resistor 15 R is the resistance of the fifteenth resistor x R is the insulation resistance value of the positive bridge arm y The insulation resistance value of the negative bridge arm is U a For the high voltage sampling voltage of the positive bridge arm, U b And sampling voltage for the high voltage of the negative bridge arm.
6. The direct current high voltage insulation detection system according to claim 5, wherein the center tap bus insulation sampling module comprises a fourth resistor, a fifth resistor, a sixth resistor, a twelfth resistor and a thirteenth resistor, and one end of the fourth resistor is grounded after being connected with one end of the fifth resistor; one end of the fourth resistor is connected with one ends of the sixth resistor and the twelfth resistor in series; the other end of the twelfth resistor is connected in series with the center tap light-operated MOS gating circuit and then connected with one end of the thirteenth resistor, the other end of the thirteenth resistor is grounded, a direct-current voltage source is connected between the other end of the first resistor and the other end of the fourth resistor, and a direct-current voltage source is connected between the other end of the fourth resistor and the other end of the eighth resistor, wherein:
wherein R is 4 R is the resistance of the fourth resistor 5 R is the resistance of the fifth resistor 6 R is the resistance of the sixth resistor 12 R is the resistance of the twelfth resistor 13 R is the resistance of the thirteenth resistor z For the insulation resistance value of the center tap, U c A voltage is sampled for the high voltage of the center tap.
7. A detection method for the direct current high voltage insulation detection system according to any one of claims 1 to 6, characterized in that the detection method is used for an MCU controller, the detection method comprising:
collecting a third positive phase sampling voltage output by the positive bridge arm voltage amplifying circuit and a third negative phase sampling voltage output by the negative bridge arm voltage amplifying circuit to obtain total voltages of the positive bridge arm and the negative bridge arm;
acquiring high-voltage sampling voltages of the positive bridge arm, the negative bridge arm and a center tap;
determining respective insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap according to the total voltage of the positive bridge arm and the negative bridge arm and the high-voltage sampling voltage of the positive bridge arm, the negative bridge arm and the center tap;
comparing insulation resistance values of the positive bridge arm, the negative bridge arm and the center tap with a reference threshold value;
and under the condition that the insulation resistance value of any one of the positive bridge arm, the negative bridge arm and the center tap is lower than the reference threshold value, turning off the direct-current high-voltage power supply of the direct-current high-voltage insulation detection system.
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