CN115078939A - Insulation test method, circuit and device for DC charging pile and computer storage medium - Google Patents
Insulation test method, circuit and device for DC charging pile and computer storage medium Download PDFInfo
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- CN115078939A CN115078939A CN202210633267.9A CN202210633267A CN115078939A CN 115078939 A CN115078939 A CN 115078939A CN 202210633267 A CN202210633267 A CN 202210633267A CN 115078939 A CN115078939 A CN 115078939A
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- 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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The application relates to a direct current charging pile insulation test method, a direct current charging pile insulation test circuit, a direct current charging pile insulation test device and a storage medium. The circuit comprises a positive switch, a negative switch, a first switch, a second switch, a first resistor, a second resistor, a third resistor and a fourth resistor. The method comprises the following steps: controlling the anode switch, the cathode switch to be closed, and the first switch and the second switch to be opened, and acquiring the voltage to ground of the anode bus and the cathode bus in a first state; controlling the positive switch, the negative switch and the first switch to be closed and the second switch to be opened, and acquiring the voltage to ground of the positive bus and the negative bus in a second state; controlling the anode switch, the cathode switch and the second switch to be closed and the first switch to be opened, and acquiring the voltage to ground of the anode bus and the cathode bus in a third state; and obtaining the earth resistance of the anode bus and the cathode bus based on the earth voltage of the anode bus and the cathode bus in each state, and determining the insulation performance according to the earth resistance. The testing method can meet the requirement of the direct current charging pile on the voltage level in a wide range and is high in measurement accuracy.
Description
Technical Field
The present disclosure relates to the field of insulation testing technologies, and in particular, to a method, a circuit, a device, and a computer-readable storage medium for testing insulation of a dc charging pile.
Background
The direct current fills electric pile is the mechatronic equipment that charges for electric automobile power battery, and wherein many parts relate to the high pressure to operating environment is relatively abominable, and vibration, the corruption of acid-base gas, the change of temperature and humidity all can cause cable and other insulating material rapid aging even insulating damage, makes equipment dielectric strength greatly reduced, threatens personal safety. Therefore, the direct current charging pile must have an insulation detection function, and when the insulation performance is reduced to a threshold value, power supply must be cut off when the safety of a user is influenced, so that the safety of the user is ensured. The method for performing the insulation test on the direct current charging pile in the prior art has the problem of low sensitivity.
Disclosure of Invention
In view of the above, it is desirable to provide a dc charging pile insulation test method, a circuit, an apparatus, and a computer storage medium capable of confirming the insulation performance of a dc charging pile with high sensitivity.
In a first aspect, an embodiment of the present invention provides a method for insulation test of a dc charging pile, which is applied to a dc charging pile insulation test circuit, where the dc charging pile includes a positive bus and a negative bus, and the dc charging pile insulation test circuit includes a positive switch, a negative switch, a first switch, a second switch, a first resistor, a second resistor, a third resistor, and a fourth resistor; the first end of the positive switch is connected with the positive bus; the first end of the first resistor is connected with the second end of the positive switch, and the second end of the first resistor is grounded through the first switch; the first end of the second resistor is connected with the second end of the positive switch, and the second end of the second resistor is grounded; the first end of the negative switch is connected with the negative bus; the first end of the third resistor is connected with the second end of the negative switch, and the second end of the third resistor is grounded through the second switch; the first end of the fourth resistor is connected with the second end of the negative switch, and the second end of the fourth resistor is grounded; the insulation test method comprises the following steps: controlling the positive switch and the negative switch to be closed, and controlling the first switch and the second switch to be opened so as to enable the direct current charging pile insulation test circuit to enter a first state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state; controlling the positive switch, the negative switch and the first switch to be closed, and controlling the second switch to be opened, so that the direct current charging pile insulation test circuit enters a second state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state; controlling the positive switch, the negative switch and the second switch to be closed, and controlling the first switch to be opened so as to enable the direct current charging pile insulation test circuit to enter a third state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state; determining a positive bus ground resistance based on the positive bus ground voltage and the negative bus ground voltage in the first state and the positive bus ground voltage and the negative bus ground voltage in the second state; determining a negative bus ground resistance based on the positive bus ground voltage and the negative bus ground voltage in the first state and the positive bus ground voltage and the negative bus ground voltage in the third state; and determining the insulation performance of the direct current charging pile based on the positive bus ground resistance and the negative bus ground resistance.
In one embodiment, the step of determining the positive bus-to-ground resistance based on the positive bus-to-ground voltage and the negative bus-to-ground voltage in the first state, and the positive bus-to-ground voltage and the negative bus-to-ground voltage in the second state includes:
inputting the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state into a first relational expression to obtain a resistance to ground of the positive bus; the first relation is:
wherein R is p Is a positive bus-to-ground resistance, U p0 Is the voltage to ground of the positive bus in the first state, U n0 Is the voltage to ground of the negative bus in the first state, U np1 Is the voltage to ground of the negative bus in the second state, U pp1 Is the voltage of the positive bus in the second state to earth, R c1 The equivalent resistance is the parallel connection equivalent resistance of the first resistance and the second resistance.
In one embodiment, the step of determining the negative bus ground resistance based on the positive bus ground voltage and the negative bus ground voltage in the first state, and the positive bus ground voltage and the negative bus ground voltage in the third state comprises:
inputting the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state, and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state into a second relational expression to obtain a ground resistance of the negative bus; the second relation is:
wherein R is n Is a negative bus-to-ground resistance, U p0 Is the voltage to ground of the positive bus in the first state, U n0 Is the voltage to ground of the negative bus in the first state, U np2 Is the negative bus line to ground voltage in the third state, U pp2 Is the voltage of the positive bus in the third state to ground, R c2 The equivalent resistance is the parallel connection equivalent resistance of the third resistance and the fourth resistance.
In one embodiment, the first resistance is the same as the third resistance; the second resistor comprises a first current limiting resistor and a first voltage dividing resistor, the fourth resistor comprises a second current limiting resistor and a second voltage dividing resistor, the first current limiting resistor is the same as the second current limiting resistor, and the first voltage dividing resistor is the same as the second voltage dividing resistor; the first end of the first current limiting resistor is connected with the second end of the positive switch, and the second end of the first current limiting resistor is grounded through the first divider resistor; the first end of the second current-limiting resistor is connected with the second end of the negative switch, and the second end of the second current-limiting resistor is grounded through a second divider resistor;
the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state comprises the following steps: acquiring the voltage to ground of a first voltage-dividing resistor and the voltage to ground of a second voltage-dividing resistor in a first state; the voltage to ground of the first voltage-dividing resistor in the first state is taken as the voltage to ground of the positive bus in the first state, and the voltage to ground of the second voltage-dividing resistor in the first state is taken as the voltage to ground of the negative bus in the first state;
the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state comprises the following steps: acquiring the voltage to ground of the first voltage-dividing resistor and the voltage to ground of the second voltage-dividing resistor in a second state; the voltage to ground of the first voltage-dividing resistor in the second state is the voltage to ground of the positive bus in the second state, and the voltage to ground of the second voltage-dividing resistor in the second state is the voltage to ground of the negative bus in the second state;
the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state comprises the following steps: acquiring the voltage to ground of the first voltage-dividing resistor and the voltage to ground of the second voltage-dividing resistor in a third state; and taking the voltage-to-ground voltage of the first voltage-dividing resistor in the third state as the voltage-to-ground voltage of the positive bus in the third state, and taking the voltage-to-ground voltage of the second voltage-dividing resistor in the third state as the voltage-to-ground voltage of the negative bus in the third state.
In a second aspect, an embodiment of the present invention provides an insulation test circuit for a dc charging pile, where the dc charging pile includes a positive bus and a negative bus, and the insulation test circuit for the dc charging pile includes: the first end of the positive switch is connected with the positive bus; the first end of the first resistor is connected with the second end of the positive switch, and the second end of the first resistor is grounded through the first switch; the first end of the second resistor is connected with the second end of the positive switch, and the second end of the second resistor is grounded; the first end of the negative switch is connected with the negative bus; the first end of the third resistor is connected with the second end of the negative switch, and the second end of the third resistor is grounded through the second switch; the first end of the fourth resistor is connected with the second end of the negative switch, and the second end of the fourth resistor is grounded; the controller is connected with the positive switch, the negative switch, the first switch and the second switch and comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the direct-current charging pile insulation test method.
In one embodiment, the first resistance is the same as the third resistance; the second resistor comprises a first current limiting resistor and a first voltage dividing resistor, the fourth resistor comprises a second current limiting resistor and a second voltage dividing resistor, the first current limiting resistor is the same as the second current limiting resistor, and the first voltage dividing resistor is the same as the second voltage dividing resistor; the first end of the first current limiting resistor is connected with the second end of the positive switch, and the second end of the first current limiting resistor is grounded through the first divider resistor; the first end of the second current-limiting resistor is connected with the second end of the negative switch, and the second end of the second current-limiting resistor is grounded through a second divider resistor; the controller is respectively connected with the first public end and the second public end; the first common end is the common end of the first current limiting resistor and the first voltage dividing resistor, and the second common end is the common end of the second current limiting resistor and the second voltage dividing resistor.
In one embodiment, the controller is connected with the first common end through the first optical coupling isolation unit, and the controller is connected with the second common end through the second optical coupling isolation unit.
In one embodiment, the positive switch, the negative switch, the first switch and the second switch each comprise a relay.
In a third aspect, an embodiment of the present invention provides an insulation test device for a dc charging pile, which is applied to an insulation test circuit for a dc charging pile, where the dc charging pile includes a positive bus and a negative bus, and the insulation test circuit for the dc charging pile includes a positive switch, a negative switch, a first switch, a second switch, a first resistor, a second resistor, a third resistor, and a fourth resistor; the first end of the positive switch is connected with the positive bus; the first end of the first resistor is connected with the second end of the positive switch, and the second end of the first resistor is grounded through the first switch; the first end of the second resistor is connected with the second end of the positive switch, and the second end of the second resistor is grounded; the first end of the negative switch is connected with the negative bus; the first end of the third resistor is connected with the second end of the negative switch, and the second end of the third resistor is grounded through the second switch; the first end of the fourth resistor is connected with the second end of the negative switch, and the second end of the fourth resistor is grounded; the insulation test device includes: the data acquisition module is used for controlling the positive switch and the negative switch to be closed and controlling the first switch and the second switch to be disconnected so as to enable the direct current charging pile insulation test circuit to enter a first state and acquire the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state; controlling the positive switch, the negative switch and the first switch to be closed, and controlling the second switch to be opened, so that the direct current charging pile insulation test circuit enters a second state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state; controlling the positive switch, the negative switch and the second switch to be closed, and controlling the first switch to be opened so as to enable the direct current charging pile insulation test circuit to enter a third state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state; the first processing module is used for determining a positive electrode bus ground resistance based on the positive electrode bus ground voltage and the negative electrode bus ground voltage in the first state and the positive electrode bus ground voltage and the negative electrode bus ground voltage in the second state; the second processing module is used for determining the ground resistance of the negative bus based on the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state; and the insulation performance determining module is used for determining the insulation performance of the direct current charging pile based on the positive bus ground resistance and the negative bus ground resistance.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method described above.
Based on any of the above embodiments, the number relation between the positive bus voltage to ground and the negative bus voltage to ground in each state is established by controlling the unbalance of the direct current charging pile insulation test circuit in different states, so that the positive bus resistance to ground and the negative bus resistance to ground are solved, and the insulation performance of the direct current charging pile can be judged according to the positive bus resistance to ground and the negative bus resistance to ground. The testing method can meet the requirement of the direct current charging pile on the wide voltage grade range and has higher measuring precision.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a DC charging pile insulation test circuit;
fig. 2 is a schematic flow chart illustrating an insulation testing method for a dc charging pile according to an embodiment;
FIG. 3 is a schematic diagram of another embodiment of a DC charging pile insulation test circuit
FIG. 4 is a schematic circuit diagram of a DC charging post insulation test circuit for testing the voltage of a positive bus to ground in one embodiment;
FIG. 5 is a schematic circuit diagram of a circuit for testing the voltage to ground of a negative bus in the DC charging post insulation test circuit according to an embodiment;
fig. 6 is a schematic circuit diagram of a controller in the dc charging post insulation test circuit according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
The embodiment of the invention provides a direct current charging pile insulation test method which is applied to a direct current charging pile insulation test circuit, and the direct current charging pile insulation test circuit can refer to fig. 1. Specifically, the direct current charging pile comprises a positive bus and a negative bus, and the insulation performance of the direct current charging pile can be generally according to the resistance R of the positive bus to the ground p And negative bus-to-ground resistance R n Determining the resistance R of the positive bus bar to ground p Namely the resistance between the anode bus and the ground chassis, and the cathode busResistance to ground R n Namely the resistance between the cathode bus and the ground chassis. The DC charging pile insulation test circuit comprises a positive switch Sp and a negative switch S n A first switch S 1 A second switch S 2 A first resistor R 1 A second resistor R 2 A third resistor R 3 A fourth resistor R 4 . Positive pole switch S p Is connected to the positive bus bar. A first resistor R 1 First terminal and positive switch S p Is connected to the second terminal of the first resistor R 1 Through the first switch S 1 And (4) grounding. A second resistor R 2 First terminal and positive switch S p Is connected to the second terminal of the first resistor R 2 The second terminal of (a) is grounded. Negative pole switch S n Is connected to the negative bus bar. Third resistor R 3 First terminal and negative switch S n Is connected to a second terminal of a third resistor R 3 Through a second switch S 2 And (4) grounding. A fourth resistor R 4 First terminal and negative switch S n Is connected to the second terminal of the fourth resistor R 4 The second terminal of (a) is grounded.
Referring to fig. 2, the insulation testing method includes steps S202 to S212.
S202, controlling a positive switch S p Negative electrode switch S n Closed to control the first switch S 1 A second switch S 2 And disconnecting the direct current charging pile insulation test circuit to enable the direct current charging pile insulation test circuit to enter a first state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state.
It can be understood that this case is equivalent to the positive bus line to ground resistance R p And a second resistor R 2 Connected in parallel between the positive bus and the ground chassis, and the negative bus is connected with a ground resistor R n And a fourth resistor R 4 Connected in parallel between the negative bus and the ground plate, and known from kirchhoff's current law 2 And a fourth resistor R 4 In the same case, the second resistance R 2 And a fourth resistor R 4 The current flowing into the chassis is equal in magnitude, so that the negative bus-bar resistance to ground R n Positive bus-bar ground resistance R p Current flowing into the ground chassisShould also be of equal size, and the negative bus-bar should have a resistance to ground R n Positive bus-bar ground resistance R p The current flowing into the ground chassis can be calculated according to the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state respectively, namely:
wherein, U p0 Is the voltage to ground of the positive bus in the first state, U n0 The voltage of the negative bus in the first state is the voltage to ground.
S204, controlling a positive switch S p Negative electrode switch S n And a first switch S 1 Closed to control the second switch S 2 And disconnecting the direct current charging pile insulation test circuit to enable the direct current charging pile insulation test circuit to enter a second state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state.
It can be understood that this case is equivalent to the positive bus line to ground resistance R p And a first resistor R 1 A second resistor R 2 Connected in parallel between the positive bus and the ground chassis, and the negative bus is connected with a ground resistor R n And a fourth resistor R 4 And is connected between the negative bus and the ground chassis in parallel. At the moment, because the circuit structures of the anode bus bar side and the cathode bus bar side are asymmetric, the earth resistance R of the anode bus bar is known according to kirchhoff current law p Current flowing into the ground chassis, first resistor R 1 Current flowing into the ground chassis and the second resistor R 2 The sum of the currents flowing into the ground chassis is equal to the ground resistance R of the negative bus n Current flows into the ground chassis. And the negative bus-bar is connected to ground resistance R n The current flowing into the ground chassis and the sum of the currents can be calculated according to the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state respectively, namely:
wherein, U np1 Is in the second stateNegative bus voltage to ground, U pp1 Is the voltage of the positive bus in the second state to earth, R c1 The equivalent resistance is the parallel connection equivalent resistance of the first resistance and the second resistance.
S206, controlling the positive switch S p Negative electrode switch S n And a second switch S 2 Closed to control the first switch S 1 And disconnecting the direct current charging pile insulation test circuit to enable the direct current charging pile insulation test circuit to enter a third state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state.
It can be understood that this case is equivalent to the positive bus line to ground resistance R p And a second resistor R 2 Connected in parallel between the positive bus and the ground chassis, and the negative bus is connected with a ground resistor R n And a third resistor R 3 A fourth resistor R 4 And is connected between the negative bus and the ground chassis in parallel. At the moment, because the circuit structures of the positive bus side and the negative bus side are asymmetric, the negative bus ground resistance R can be known according to kirchhoff's current law n Current flowing into the ground chassis, third resistance R 3 Current flowing into the ground chassis and the fourth resistor R 4 The sum of the currents flowing into the ground chassis is equal to the resistance R of the positive bus to the ground p Current flows into the ground chassis. And the positive bus-bar pair ground resistance R p The current flowing into the ground chassis and the sum of the currents can be calculated according to the voltage of the positive bus to the ground and the voltage of the negative bus to the ground in the third state respectively, namely:
wherein, U np2 Is the negative bus line to ground voltage in the third state, U pp2 Is the voltage of the positive bus in the third state to ground, R c2 The equivalent resistance is the parallel connection equivalent resistance of the third resistance and the fourth resistance.
S208, determining the ground resistance R of the positive bus based on the ground voltage of the positive bus and the ground voltage of the negative bus in the first state and the ground voltage of the positive bus and the ground voltage of the negative bus in the second state p 。
In particular toIn the above formulas (1) and (2), only the positive electrode bus bar ground resistance R is present p And negative bus-to-ground resistance R n Two unknowns, R in the above formula (1) n The positive bus-to-ground resistance R can be obtained by replacing the positive bus-to-ground resistance R in the formula (2) p The first relation:
wherein R is p Is a positive bus-to-ground resistance, U p0 Is the voltage to ground of the positive bus in the first state, U n0 Is the voltage to ground of the negative bus in the first state, U pp1 Is the voltage to ground of the positive bus in the second state, U np1 Is the voltage to ground of the negative bus in the second state, R c1 The equivalent resistance is the parallel connection equivalent resistance of the first resistance and the second resistance. The voltage to earth of the positive bus and the voltage to earth of the negative bus in the first state and the voltage to earth of the positive bus and the voltage to earth of the negative bus in the second state are input into the first relational expression, and then the resistance R of the positive bus to earth can be obtained p 。
S210, determining a negative bus ground resistance R based on the positive bus ground voltage and the negative bus ground voltage in the first state and the positive bus ground voltage and the negative bus ground voltage in the third state n 。
Specifically, in the above formulas (1) and (3), only the positive electrode bus bar ground resistance R exists p And negative bus-to-ground resistance R n Two unknowns, R in the above formula (1) p Replacing the positive bus with the formula (3) to obtain the positive bus ground resistance R n I.e. the second relation:
wherein R is n Is a negative bus-to-ground resistance, U p0 Is the voltage to ground of the positive bus in the first state, U n0 Is the voltage to ground of the negative bus in the first state, U np2 Is the negative bus line to ground voltage in the third state, U pp2 Is the voltage of the positive bus in the third state to ground, R c2 Is a third resistor R 3 And a fourth resistor R 4 The parallel equivalent resistance of (1). Inputting the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state into a third relation formula, and obtaining the resistance R of the negative bus to ground n 。
S212, based on the positive bus line to the ground resistance R p Negative bus-to-ground resistance R n And determining the insulation performance of the direct current charging pile.
When the insulating capability of the direct current charging pile is good, the positive bus is resistance to ground R p And negative bus-to-ground resistance R n Should be greater than the threshold resistance, i.e. the dc charging post is insulated from ground.
Based on the insulation test method of the direct current charging pile in the embodiment, the quantity relation between the voltage of the positive bus to the ground and the voltage of the negative bus to the ground in each state is constructed by controlling the unbalance of the insulation test circuit of the direct current charging pile in different states, so that the resistance R of the positive bus to the ground is solved p Negative bus-to-ground resistance R n According to the resistance R of the positive busbar to ground p Negative bus-to-ground resistance R n The insulating property of the direct current charging pile can be judged. The testing method can meet the requirement of the direct current charging pile on the wide voltage grade range and has higher measuring precision.
In one embodiment, referring to fig. 3, the dc charging pile insulation test circuit includes a first resistor R 1 And a third resistor R 3 The same is true. A second resistor R 2 Comprises a first current limiting resistor R 22 And a first voltage dividing resistor R 24 Fourth resistor R 4 Comprising a second current limiting resistor R 42 And a second voltage dividing resistor R 44 . First current limiting resistor R 22 And a second current limiting resistor R 42 Same, the first divider resistance R 24 And a second voltage dividing resistor R 44 The same is true. First current limiting resistor R 22 First terminal and positive switch S p Is connected to the second terminal of the first current limiting circuitResistance R 22 Through a first divider resistor R 24 And (4) grounding. Second current limiting resistor R 42 First terminal and negative switch S n Is connected to a second terminal of a second current limiting resistor R 42 Through a second voltage dividing resistor R 44 And (4) grounding. It can be understood that the voltage level span range of the direct-current charging pile is large, and the measuring range of the ordinary voltage sensor is difficult to meet the requirement of directly testing the voltage to ground of the positive bus or the negative bus. Therefore, in the embodiment, the test point of the voltage to ground of the positive bus is placed at the first current limiting resistor R 22 At the second terminal (i.e., at the positive test point in fig. 3), the test point of the negative bus to ground voltage is placed at the second current limiting resistor R 42 At the second end (i.e., at the negative test point of fig. 3). Taking the positive test point as an example, the second resistor R 2 And positive bus-to-ground resistance R p The two resistors are connected in parallel, so that the voltages of the two resistors are equal, the voltage obtained from the positive test point is less than the voltage to ground of the positive bus, the voltage to ground can adapt to the measuring range of a common voltage sensor, and the voltage to ground can be limited according to the first current limiting resistor R 22 And a first voltage dividing resistor R 24 The relation between the positive bus and the ground voltage does not influence the measurement effect. In addition, a first current limiting resistor R 22 The current is ensured not to be overlarge, and the safety of the test process is ensured. The principle of the negative test is similar and will not be described in detail herein.
Based on the circuit configuration in fig. 3, the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state includes: obtaining a first divider resistance R in a first state 24 A voltage to ground and a second voltage dividing resistor R 44 A voltage to ground; in a first state 24 The voltage to ground is the voltage to ground of the positive bus in the first state, and the second voltage-dividing resistor R in the first state 44 The voltage to ground is the voltage to ground of the negative bus in the first state.
The step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state comprises the following steps: obtaining the first voltage dividing resistance R in the second state 24 A voltage to ground and a second voltage dividing resistor R 44 A voltage to ground; in the second state 24 The voltage to ground is the voltage to ground of the anode bus in the second state, and the second voltage-dividing resistor R in the second state 44 The voltage to ground is the voltage to ground of the negative bus in the second state;
the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state comprises the following steps: obtaining the first divider resistance R in the third state 24 A voltage to ground and a second voltage dividing resistor R 44 A voltage to ground; first divider resistor R in third state 24 The voltage to ground is the voltage to ground of the positive bus in the third state, and the second voltage-dividing resistor R in the third state 44 The ground voltage is the negative bus-to-ground voltage in the third state.
In particular, in order to dispense with the resistor according to the first divider resistance R 24 Calculating the voltage of the positive bus to the ground and according to the second voltage dividing resistor R 44 Calculating the trouble of the negative bus voltage to ground, selecting a first current limiting resistor R 22 And a second current limiting resistor R 42 Set to be the same, the first divider resistance R 24 And a second voltage dividing resistor R 44 Set to, then the first divider resistance R 24 A first quantity relation between the voltage to ground and the voltage to ground of the positive bus (obtained according to serial voltage division), a second voltage division resistor R 44 The second numerical relationship between the voltage to ground and the voltage to ground of the negative bus is the same (obtained from the series voltage division), so the first voltage dividing resistor R can be directly used in the above equations (1), (2) and (3) 24 Replacing the positive bus voltage to ground with the voltage to ground, and using a second voltage-dividing resistor R 44 And replacing the voltage to ground of the negative bus.
It should be understood that, although the steps in the flowchart of fig. 2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 2 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
Referring to fig. 1, an embodiment of the present invention provides an insulation test circuit for a dc charging pile, where the dc charging pile includes a positive bus and a negative bus. Direct current fills electric pile insulation test circuit includes: positive pole switch S p The first end is connected with the positive bus; a first resistor R 1 First terminal and positive switch S p Is connected with the second end of the first switch S 1 Grounding; a second resistor R 2 First terminal and positive switch S p The second end of the first switch is connected with the ground; negative pole switch S n The first end is connected with a negative bus; third resistor R 3 First terminal and negative switch S n Is connected to the second terminal of the first switch S 2 Grounding; a fourth resistor R 4 First terminal and negative switch S n The second end of the first switch is connected with the ground; controller, and positive switch S p And a negative electrode switch S n A first switch S 1 And a second switch S 2 And the connection device comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the direct current charging pile insulation test method.
Based on the insulation test circuit of the direct current charging pile in the embodiment, the quantity relation between the voltage of the positive bus and the voltage of the negative bus in each state is constructed by controlling the unbalance of the insulation test circuit of the direct current charging pile in different states, so that the ground resistance R of the positive bus is solved p Negative bus-to-ground resistance R n According to the resistance R of the positive busbar to ground p Negative bus-to-ground resistance R n The insulating property of the direct current charging pile can be judged. The test circuit can meet the requirement of the direct current charging pile on the wide voltage level range and has higher measurement precision.
In one embodiment, the first resistor R 1 And a third resistor R 3 The same; a second resistor R 2 Comprises a first current limiting resistor R 22 And a first voltage dividing resistor R 24 Fourth resistance R 4 Comprising a second current limiting resistor R 42 And a second voltage dividing resistor R 44 First current limiting resistor R 22 And a second current limiting resistor R 42 Same, the first divider resistance R 24 And a second voltage dividing resistor R 44 The same; first current limiting resistor R 22 First terminal and positive switch S p Is connected to the first current limiting resistor R 22 Through a first divider resistor R 24 Grounding; second current limiting resistor R 42 First terminal and negative electrode switch S n Is connected to a second terminal of a second current limiting resistor R 42 Through a second voltage dividing resistor R 44 Grounding; the controller is respectively connected with the first public end and the second public end; the first common terminal is a first current limiting resistor R 22 And a first voltage dividing resistor R 24 The second common terminal is a second current limiting resistor R 42 And a second voltage dividing resistor R 44 To the public terminal.
In one embodiment, the controller is connected with the first common end through the first optical coupling isolation unit, and the controller is connected with the second common end through the second optical coupling isolation unit. It can be understood that the anti-interference capability of signal transmission can be increased through optical coupling isolation, and the insulation test precision is further ensured.
In one embodiment, the positive switch S p Negative electrode switch S n A first switch S 1 And a second switch S 2 Each comprising a relay.
In one embodiment, please refer to FIG. 4, which shows the positive switch S p The circuit comprises a relay RL551, a controller is connected with the base electrode of a triode Q551, and the relay RL551 is electrified or deenergized by controlling the on-off of the triode Q551, so that a positive switch S is controlled p And (5) switching on and off. In the figure, resistors B551, R554, R555, R556, R557, R558, R559 and R564 together form a first current limiting resistor R 22 . The resistor R568 is the first divider resistor R 24 The positive test point is at VIN _ DC1 +. In the figure, the resistor R560 is a first resistor R 1 . First switch S 1 Comprising a relay RL552, the controller is connected with the base electrode of the triode Q552, and the relay RL552 is electrified or deenergized by controlling the on-off of the triode Q552, so that the first switch S is controlled 1 And (5) switching on and off.
In one embodiment, please refer to FIG. 5, in which the negative switch S n The circuit comprises a relay RL601, a controller is connected with a base electrode of a triode Q601, the relay RL601 is powered on or powered off by controlling the on-off of the triode Q601, and a negative switch S is controlled n And (5) switching on and off. In the figure, the resistors B601, R603, R604, R605, R606, R607, R608 and R613 form a second current limiting resistor R 42 . The resistor R617 is a second divider resistor R 44 And VIN _ DC 1-is the negative test point. The resistor R609 is a third resistor R 3 . A second switch S 2 The circuit comprises a relay RL602, a controller is connected with the base of a triode Q602, and the relay RL602 is powered on or powered off by controlling the on-off of the triode Q602 so as to control a second switch S 2 And (5) switching on and off.
In one embodiment, referring to fig. 6, the controller may include a metrology chip RN8209C, wherein the metrology chip RN8209C receives the positive bus-to-ground voltage in each state via 5 pins, and the metrology chip RN8209C receives the negative bus-to-ground voltage in each state via 7 pins. The metering chip RN8209C can perform analog-to-digital conversion on the signal, and calculate the resistance R of the positive bus to the ground by using the expression in the above embodiment for the converted data p And negative bus-to-ground resistance R n 。
The embodiment of the invention provides a direct current charging pile insulation test device which is applied to a direct current charging pile insulation test circuit, the direct current charging pile insulation test circuit can refer to fig. 1, the direct current charging pile comprises a positive bus and a negative bus, and the direct current charging pile insulation test circuit comprises a positive switch S p Negative electrode switch S n A first switch S 1 A second switch S 2 A first resistor R 1 A second resistor R 2 A third resistor R 3 A fourth resistor R 4 . The first end of the positive switch Sp is connected to the positive bus bar. A first resistor R 1 Is connected with the second end of the positive switch Sp, and a first resistor R 1 To (1)Two ends of the first switch S 1 And (4) grounding. A second resistor R 2 Is connected with the second end of the positive switch Sp, and a second resistor R 2 The second terminal of (a) is grounded. Negative pole switch S n Is connected to the negative bus bar. Third resistor R 3 First terminal and negative switch S n Is connected to the second terminal of the third resistor R 3 Through a second switch S 2 And (4) grounding. A fourth resistor R 4 First terminal and negative electrode switch S n Is connected to the second terminal of the fourth resistor R 4 The second terminal of (a) is grounded. The insulation test device comprises a data acquisition module, a first processing module, a second processing module and an insulation performance determination module.
The data acquisition module is used for controlling the anode switch Sp and the cathode switch S n Closed to control the first switch S 1 A second switch S 2 Disconnecting to enable the direct current charging pile insulation test circuit to enter a first state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state; controlling a positive switch Sp and a negative switch S n And a first switch S 1 Closed to control the second switch S 2 Disconnecting to enable the direct current charging pile insulation test circuit to enter a second state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state; controlling a positive switch Sp and a negative switch S n And a second switch S 2 Closed to control the first switch S 1 And disconnecting the direct current charging pile insulation test circuit to enable the direct current charging pile insulation test circuit to enter a third state, and acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state.
The first processing module is used for determining the positive bus ground resistance Rp based on the positive bus ground voltage and the negative bus ground voltage in the first state and the positive bus ground voltage and the negative bus ground voltage in the second state.
The second processing module is used for determining the ground resistance R of the negative bus based on the ground voltage of the positive bus and the ground voltage of the negative bus in the first state and the ground voltage of the positive bus and the ground voltage of the negative bus in the third state n 。
Insulation performance is confirmedThe fixed module is used for grounding resistance Rp based on the positive bus and grounding resistance R based on the negative bus n And determining the insulation performance of the direct current charging pile.
For specific limitations of the dc charging pile insulation test device, reference may be made to the above limitations on the dc charging pile insulation test method, which is not described herein again. All modules in the direct current charging pile insulation testing device can be completely or partially realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. The non-volatile memory may include a Read-only memory (Read-O) n ly Memory, ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. The volatile memory may comprise random access memory (Ra) n dom Access Memory, RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static random access memory (Static Ra) n dom Access Memory, SRAM) or dynamic random Access Memory (Dy) n amic Ra n dom Access Memory, DRAM), etc.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The insulation test method of the direct current charging pile is characterized by being applied to an insulation test circuit of the direct current charging pile, wherein the direct current charging pile comprises a positive bus and a negative bus, and the insulation test circuit of the direct current charging pile comprises a positive switch, a negative switch, a first switch, a second switch, a first resistor, a second resistor, a third resistor and a fourth resistor; the first end of the positive switch is connected with the positive bus; the first end of the first resistor is connected with the second end of the positive switch, and the second end of the first resistor is grounded through the first switch; the first end of the second resistor is connected with the second end of the positive switch, and the second end of the second resistor is grounded; the first end of the negative switch is connected with the negative bus; the first end of the third resistor is connected with the second end of the negative switch, and the second end of the third resistor is grounded through the second switch; the first end of the fourth resistor is connected with the second end of the negative switch, and the second end of the fourth resistor is grounded; the insulation test method comprises the following steps:
controlling the positive switch and the negative switch to be closed, and controlling the first switch and the second switch to be opened, so that the direct current charging pile insulation test circuit enters a first state, and acquiring the voltage to ground of a positive bus and the voltage to ground of a negative bus in the first state;
controlling the positive switch, the negative switch and the first switch to be closed, and controlling the second switch to be opened, so that the direct current charging pile insulation test circuit enters a second state, and acquiring the voltage to ground of a positive bus and the voltage to ground of a negative bus in the second state;
controlling the positive switch, the negative switch and the second switch to be closed, and controlling the first switch to be opened, so that the direct current charging pile insulation test circuit enters a third state, and acquiring the voltage to ground of a positive bus and the voltage to ground of a negative bus in the third state;
determining a positive bus ground resistance based on the positive bus ground voltage and the negative bus ground voltage in the first state and the positive bus ground voltage and the negative bus ground voltage in the second state;
determining a negative bus ground resistance based on the positive bus ground voltage and the negative bus ground voltage in the first state, and the positive bus ground voltage and the negative bus ground voltage in the third state;
and determining the insulation performance of the direct current charging pile based on the positive bus ground resistance and the negative bus ground resistance.
2. The direct current charging pile insulation test method according to claim 1, wherein the step of determining the positive bus ground resistance based on the positive bus ground voltage and the negative bus ground voltage in the first state, and the positive bus ground voltage and the negative bus ground voltage in the second state comprises:
inputting the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state into a first relational expression to obtain the resistance to ground of the positive bus; the first relation is:
wherein R is p Is the positive bus-bar resistance to ground, U p0 Is the voltage to ground of the positive bus in the first state, U n0 Is the voltage to ground of the negative bus in the first state, U np1 Is the voltage to ground of the negative bus in the second state, U pp1 Is the voltage to ground of the positive bus in the second state, R c1 The equivalent resistance is the parallel connection equivalent resistance of the first resistance and the second resistance.
3. The direct current charging pile insulation test method according to claim 1, wherein the step of determining the negative bus ground resistance based on the positive bus ground-to-ground voltage and the negative bus ground-to-ground voltage in the first state, and the positive bus ground-to-ground voltage and the negative bus ground-to-ground voltage in the third state comprises:
inputting the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state, and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state into a second relational expression to obtain the ground resistance of the negative bus; the second relation is:
wherein R is n Is the negative bus-bar resistance to ground, U p0 Is the voltage to ground of the positive bus in the first state, U n0 Is the negative bus bar in the first stateTo ground voltage, U np2 Is the voltage of the negative bus in the third state to ground, U pp2 Is the voltage of the positive bus in the third state to ground, R c2 The equivalent resistance is the parallel connection equivalent resistance of the third resistance and the fourth resistance.
4. The direct current charging pile insulation test method according to claim 2 or 3, wherein the first resistance is the same as the third resistance; the second resistor comprises a first current limiting resistor and a first voltage dividing resistor, the fourth resistor comprises a second current limiting resistor and a second voltage dividing resistor, the first current limiting resistor is the same as the second current limiting resistor, and the first voltage dividing resistor is the same as the second voltage dividing resistor; the first end of the first current limiting resistor is connected with the second end of the positive switch, and the second end of the first current limiting resistor is grounded through the first voltage dividing resistor; the first end of the second current-limiting resistor is connected with the second end of the negative switch, and the second end of the second current-limiting resistor is grounded through the second voltage-dividing resistor;
the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state comprises the following steps:
acquiring the voltage to ground of the first voltage-dividing resistor and the voltage to ground of the second voltage-dividing resistor in the first state;
taking the voltage-to-ground voltage of the first voltage-dividing resistor in the first state as the voltage-to-ground voltage of the positive bus in the first state, and taking the voltage-to-ground voltage of the second voltage-dividing resistor in the first state as the voltage-to-ground voltage of the negative bus in the first state;
the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state comprises the following steps:
acquiring the voltage to ground of the first voltage-dividing resistor and the voltage to ground of the second voltage-dividing resistor in the second state;
taking the voltage-to-ground voltage of the first voltage-dividing resistor in the second state as the voltage-to-ground voltage of the positive bus in the second state, and taking the voltage-to-ground voltage of the second voltage-dividing resistor in the second state as the voltage-to-ground voltage of the negative bus in the second state;
the step of acquiring the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state comprises:
acquiring the voltage to ground of the first voltage-dividing resistor and the voltage to ground of the second voltage-dividing resistor in the third state;
and taking the voltage-to-ground voltage of the first voltage-dividing resistor in the third state as the voltage-to-ground voltage of the positive bus in the third state, and taking the voltage-to-ground voltage of the second voltage-dividing resistor in the third state as the voltage-to-ground voltage of the negative bus in the third state.
5. The utility model provides a direct current fills electric pile insulation test circuit, its characterized in that, direct current fills electric pile and includes anodal generating line and negative pole generating line, direct current fills electric pile insulation test circuit and includes:
the first end of the positive switch is connected with the positive bus;
the first end of the first resistor is connected with the second end of the positive switch, and the second end of the first resistor is grounded through the first switch;
the first end of the second resistor is connected with the second end of the positive switch, and the second end of the second resistor is grounded;
a negative switch, a first end of which is connected with the negative bus;
the first end of the third resistor is connected with the second end of the negative switch, and the second end of the third resistor is grounded through the second switch;
a first end of the fourth resistor is connected with the second end of the negative switch, and the second end of the fourth resistor is grounded;
the controller is connected with the positive switch, the negative switch, the first switch and the second switch and comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the direct current charging pile insulation test method of any one of claims 1 to 4.
6. The DC charging post insulation test circuit of claim 5, wherein the first resistance is the same as the third resistance; the second resistor comprises a first current limiting resistor and a first voltage dividing resistor, the fourth resistor comprises a second current limiting resistor and a second voltage dividing resistor, the first current limiting resistor is the same as the second current limiting resistor, and the first voltage dividing resistor is the same as the second voltage dividing resistor;
the first end of the first current limiting resistor is connected with the second end of the positive switch, and the second end of the first current limiting resistor is grounded through the first voltage dividing resistor; the first end of the second current-limiting resistor is connected with the second end of the negative switch, and the second end of the second current-limiting resistor is grounded through the second voltage-dividing resistor;
the controller is respectively connected with the first public end and the second public end; the first common terminal is a common terminal of the first current limiting resistor and the first voltage dividing resistor, and the second common terminal is a common terminal of the second current limiting resistor and the second voltage dividing resistor.
7. The direct current charging pile insulation test circuit of claim 6, wherein the controller is connected with the first common end through a first optical coupling isolation unit, and the controller is connected with the second common end through a second optical coupling isolation unit.
8. The DC charging post insulation test circuit of claim 5, wherein the positive switch, the negative switch, the first switch, and the second switch each comprise a relay.
9. The insulation test device for the direct current charging pile is characterized by being applied to an insulation test circuit for the direct current charging pile, wherein the direct current charging pile comprises a positive bus and a negative bus, and the insulation test circuit for the direct current charging pile comprises a positive switch, a negative switch, a first switch, a second switch, a first resistor, a second resistor, a third resistor and a fourth resistor; the first end of the positive switch is connected with the positive bus; the first end of the first resistor is connected with the second end of the positive switch, and the second end of the first resistor is grounded through the first switch; the first end of the second resistor is connected with the second end of the positive switch, and the second end of the second resistor is grounded; the first end of the negative switch is connected with the negative bus; the first end of the third resistor is connected with the second end of the negative switch, and the second end of the third resistor is grounded through the second switch; the first end of the fourth resistor is connected with the second end of the negative switch, and the second end of the fourth resistor is grounded; the insulation test device includes:
the data acquisition module is used for controlling the positive switch and the negative switch to be closed and controlling the first switch and the second switch to be opened so as to enable the direct current charging pile insulation test circuit to enter a first state and acquire the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state; controlling the positive switch, the negative switch and the first switch to be closed, and controlling the second switch to be opened, so that the direct current charging pile insulation test circuit enters a second state, and acquiring the voltage to ground of a positive bus and the voltage to ground of a negative bus in the second state; controlling the positive switch, the negative switch and the second switch to be closed, and controlling the first switch to be opened, so that the direct current charging pile insulation test circuit enters a third state, and acquiring the voltage to ground of a positive bus and the voltage to ground of a negative bus in the third state;
the first processing module is used for determining the ground resistance of the positive bus based on the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the second state;
the second processing module is used for determining the ground resistance of the negative bus based on the voltage to ground of the positive bus and the voltage to ground of the negative bus in the first state and the voltage to ground of the positive bus and the voltage to ground of the negative bus in the third state;
and the insulation performance determining module is used for determining the insulation performance of the direct current charging pile based on the positive bus ground resistance and the negative bus ground resistance.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
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| CN202210633267.9A CN115078939A (en) | 2022-06-07 | 2022-06-07 | Insulation test method, circuit and device for DC charging pile and computer storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117665396A (en) * | 2024-01-31 | 2024-03-08 | 徐州徐工汽车制造有限公司 | Insulation resistance detection circuit, method, device and medium for power battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117665396A (en) * | 2024-01-31 | 2024-03-08 | 徐州徐工汽车制造有限公司 | Insulation resistance detection circuit, method, device and medium for power battery |
| CN117665396B (en) * | 2024-01-31 | 2024-06-07 | 徐州徐工汽车制造有限公司 | Insulation resistance detection circuit, method, device and medium for power battery |
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