CN109917240B - Bilateral direct-current insulation detection method and system - Google Patents
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Abstract
The invention discloses a bilateral direct current insulation detection method and system. The system comprises: the detection circuit is used for setting detection resistors with different resistance values between the anode and the ground wire and between the cathode and the ground wire in an unbalanced bridge mode; the voltage sampling circuit is used for collecting detection voltages on all the detection resistors; and the processing module is used for calculating the leakage resistance between the positive electrode and the ground wire and/or between the negative electrode and the ground wire of the direct-current power supply output by the charging pile according to a preset algorithm and the received detection voltage. According to the invention, by adopting an unbalanced bridge mode, the detection resistors with different resistance values are arranged between the positive electrode and the ground wire and between the negative electrode and the ground wire, so that the condition of misjudgment of the existing bilateral insulation detection can be avoided, the insulation detection of unilateral and bilateral leakage can be further satisfied, the application range is wide, and the reliability of the insulation detection is also ensured. In addition, the deviation of the calculated leakage resistance is also reduced by linear fitting, and the accuracy of judgment is mentioned.
Description
Technical Field
The invention relates to the technical field of insulation detection, in particular to a bilateral direct current insulation detection method and system.
Background
Along with the popularity of energy-saving and environment-friendly concepts, green charging automobiles are more and more accepted by people, and charging piles are also being tightened and configured. But the insulating properties of filling electric pile directly influences its security of using, and it is also more important to fill the insulating nature of electric pile and detect.
During existing insulation detection of a charging pile, unilateral detection is generally adopted, specifically, detection resistors with the same resistance value are arranged between an anode and a ground wire of a charging pile output direct-current power supply and between a cathode and the ground wire, and then detection voltages on the two detection resistors are respectively sampled, so that whether unilateral electric leakage exists or not is judged (namely electric leakage exists at the anode or at the cathode). However, if a double-side leakage occurs (i.e., the positive electrode and the negative electrode have leakage at the same time), a situation that the detection is determined to be leakage-free may occur (when the two detected voltages are the same, a misjudgment situation that the positive electrode and the negative electrode have no leakage occurs because the voltages between the positive electrode and the ground line and between the negative electrode and the ground line are the same), and further, a misjudgment may be caused. Therefore, the existing insulation detection for the charging pile is insufficient when the bilateral leakage condition is met, and the reliability of insulation detection is difficult to guarantee.
Disclosure of Invention
In order to solve the problems in the prior art, embodiments of the present invention provide a method and a system for detecting bilateral dc insulation. The technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a bilateral dc insulation detection system, including:
the detection circuit is respectively connected with the anode, the cathode and the ground wire of the direct-current power supply output by the charging pile and is used for arranging detection resistors with different resistance values between the anode and the ground wire and between the cathode and the ground wire in an unbalanced bridge mode;
the voltage sampling circuit is connected with the detection circuit and is used for collecting detection voltages on all the detection resistors;
and the processing module is connected with the voltage sampling circuit and used for calculating the leakage resistance between the anode and the ground wire and/or between the cathode and the ground wire of the direct-current power supply output by the charging pile according to a preset algorithm and the received detection voltage.
In the above-mentioned bilateral dc insulation detection system according to an embodiment of the present invention, the detection circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, a second switch,
two ends of the first resistor are respectively connected with the anode of the direct-current power supply output by the charging pile and the ground wire; two ends of the second resistor are respectively connected with the negative electrode of the direct-current power supply output by the charging pile and the ground wire; one end of the third resistor is connected with the anode of the charging pile output direct-current power supply, and the other end of the third resistor is connected with the ground wire through the first switch; one end of the fourth resistor is connected with the negative electrode of the charging pile for outputting the direct-current power supply, and the other end of the fourth resistor is connected with the ground wire through the second switch.
In the above-mentioned double-side dc insulation detection system according to the embodiment of the present invention, the first resistor and the second resistor have the same resistance value, and the third resistor and the fourth resistor have the same resistance value.
In the bilateral dc insulation detection system according to the embodiment of the present invention, the processing module is further configured to calculate a leakage resistance Rx between the positive electrode and the ground line of the dc power supply output by the charging pile and a leakage resistance Ry between the negative electrode and the ground line according to the following formula:
wherein, R1 is the resistance value of first resistance, R3 is the resistance value of third resistance, Vx1 is the first detected voltage that gathers on the first resistance when first switch switches on and the second switch disconnection, Vy1 is the second detected voltage that gathers on the second resistance when first switch switches on and the second switch disconnection, Vx2 is the third detected voltage that gathers on the first resistance when first switch disconnection and the second switch switches on, Vy2 is the fourth detected voltage that gathers on the second resistance when first switch closure and the second switch disconnection.
In the above-mentioned bilateral dc insulation detection system according to the embodiment of the present invention, the system further includes: the calibration module is used for calibrating the calibration module,
and the calibration module is connected with the processing module and used for performing linear fitting calibration on the leakage resistance calculated by the processing module according to a preset linear fitting calibration rule, wherein the linear fitting calibration rule is obtained after the leakage resistance calculated by the standard leakage resistance and the corresponding standard leakage resistance are subjected to linear fitting when the leakage condition is simulated by the standard leakage resistance.
On the other hand, an embodiment of the present invention provides a bilateral dc insulation detection method, including:
detecting resistors with different resistance values are arranged between the positive electrode and the ground wire and between the negative electrode and the ground wire of the direct-current power supply output by the charging pile in an unbalanced bridge mode;
collecting detection voltages on all detection resistors;
and calculating the leakage resistance between the anode and the ground wire and/or between the cathode and the ground wire of the direct current power supply output by the charging pile according to a preset algorithm and the received detection voltage.
In the above-mentioned bilateral dc insulation detection method according to the embodiment of the present invention, the setting of the detection resistors with different resistance values between the positive electrode and the ground line and between the negative electrode and the ground line of the dc power output from the charging pile in the unbalanced bridge manner includes:
a first resistor is connected in series between the positive electrode of the direct current power supply output by the charging pile and the ground wire, and a second resistor is connected in series between the negative electrode of the direct current power supply output by the charging pile and the ground wire;
and a third resistor and a first switch are connected in series between the positive electrode of the charging pile for outputting the direct current power supply and the ground wire, and a fourth resistor and a second switch are connected in series between the negative electrode of the charging pile for outputting the direct current power supply and the ground wire.
In the above-mentioned double-side dc insulation detection method according to the embodiment of the present invention, the first resistor and the second resistor have the same resistance value, and the third resistor and the fourth resistor have the same resistance value.
In the bilateral dc insulation detection method according to the embodiment of the present invention, calculating the leakage resistance between the positive electrode of the dc power supply output from the charging pile and the ground line and/or between the negative electrode of the dc power supply output from the charging pile and the ground line according to the preset algorithm and the received detection voltage includes:
calculating the leakage resistance Rx between the positive electrode and the ground wire of the charging pile output direct-current power supply and the leakage resistance Ry between the negative electrode and the ground wire according to the following formula:
wherein, R1 is the resistance value of first resistance, R3 is the resistance value of third resistance, Vx1 is the first detected voltage that gathers on the first resistance when first switch switches on and the second switch disconnection, Vy1 is the second detected voltage that gathers on the second resistance when first switch switches on and the second switch disconnection, Vx2 is the third detected voltage that gathers on the first resistance when first switch disconnection and the second switch switches on, Vy2 is the fourth detected voltage that gathers on the second resistance when first switch closure and the second switch disconnection.
In the above-mentioned double-side dc insulation detection method according to the embodiment of the present invention, the method further includes:
and performing linear fitting calibration on the calculated leakage resistance according to a preset linear fitting calibration rule, wherein the linear fitting calibration rule is obtained by performing linear fitting on the calculated leakage resistance and a corresponding standard leakage resistance when the leakage condition is simulated through the standard leakage resistance.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
by adopting the mode of the unbalanced bridge, the detection resistors with different resistance values are arranged between the positive electrode and the ground wire and between the negative electrode and the ground wire, the condition that the existing bilateral insulation detection is misjudged can be avoided, and further the insulation detection of unilateral and bilateral leakage can be met, the application range is wide, and the reliability of the insulation detection is ensured. In addition, the deviation of the calculated leakage resistance is also reduced by linear fitting, and the accuracy of judgment is mentioned.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a bilateral dc insulation detection system according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an example of an insulation detection process of a detection circuit according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an example of an insulation detection process of a detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a bilateral dc insulation detection method according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a bilateral direct current insulation detection system, which is suitable for performing insulation detection on bilateral leakage conditions of charging piles, and referring to fig. 1, the bilateral direct current insulation detection system can comprise:
the detection circuit 100 is connected to the positive electrode, the negative electrode, and the ground of the dc power supply output from the charging pile, and is configured to set detection resistors having different resistance values between the positive electrode and the ground and between the negative electrode and the ground in an unbalanced bridge manner.
In this embodiment, since the insulation detection in the prior art adopts a balanced bridge manner, that is, the detection resistors with the same resistance values are arranged between the positive electrode and the ground line and between the negative electrode and the ground line, when the two collected detection voltages are the same, the misjudgment condition that the positive electrode and the negative electrode have no electric leakage occurs because the voltages between the positive electrode and the ground line and between the negative electrode and the ground line are the same. And adopt the mode of unbalanced bridge, set up the detection resistance that the resistance value is different between anodal and ground wire and between negative pole and ground wire, can avoid the condition of above-mentioned erroneous judgement to appear, and then can satisfy unilateral (anodal or negative pole electric leakage) and bilateral (anodal and negative pole electric leakage simultaneously) the insulation detection of electric leakage, ensured insulation detection's reliability.
And the voltage sampling circuit 200 is connected with the detection circuit and is used for collecting the detection voltages on all the detection resistors.
And the processing module 300 is connected with the voltage sampling circuit and is used for calculating the leakage resistance between the positive electrode and the ground wire and/or between the negative electrode and the ground wire of the direct-current power supply output by the charging pile according to a preset algorithm and the received detection voltage.
Alternatively, referring to fig. 2 and 3, the detection circuit 100 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first switch S1 and a second switch S2.
Two ends of the first resistor are respectively connected with the anode of the direct-current power supply output by the charging pile and the ground wire; two ends of the second resistor are respectively connected with the negative electrode of the direct-current power supply output by the charging pile and the ground wire; one end of the third resistor is connected with the anode of the charging pile output direct-current power supply, and the other end of the third resistor is connected with the ground wire through the first switch; one end of the fourth resistor is connected with the negative electrode of the charging pile for outputting the direct-current power supply, and the other end of the fourth resistor is connected with the ground wire through the second switch.
In the present embodiment, the first switch S1 and the second switch S2 may be controlled by the processing module 300, referring to fig. 2, when the first switch S1 is turned on and the second switch S2 is turned off, the first resistor R1 and the third resistor R3 are connected in parallel to form a detection resistor between the positive electrode and the ground, and the second resistor R2 is a detection resistor between the negative electrode and the ground; referring to fig. 3, when the first switch S1 is turned off and the second switch S2 is turned on, the first resistor R1 is a detection resistor between the positive electrode and the ground, and the second resistor R2 and the fourth resistor R4 are connected in parallel to form a detection resistor between the negative electrode and the ground. It should be noted that the resistor Rx in fig. 2 and 3 is a simulated leakage resistor between the positive electrode and the ground line, and the resistor Ry is a simulated leakage resistor between the negative electrode and the ground line, which are not actually mounted resistor components, and the resistor Rx and the resistor Ry are labeled here for easy understanding when the following formula calculation is deduced.
Further, the first resistor R1 has the same resistance as the second resistor R2, and the third resistor R3 has the same resistance as the fourth resistor R4. For example: r1 ═ R2 ═ 1350K Ω, and R3 ═ R4 ═ 110K Ω.
Further, the processing module 300 is further configured to calculate a leakage resistance Rx between the positive electrode of the charging pile output dc power supply and the ground line and a leakage resistance Ry between the negative electrode of the charging pile output dc power supply and the ground line according to the following formula:
wherein, R1 is the resistance value of first resistance, R3 is the resistance value of third resistance, Vx1 is the first detected voltage that gathers on the first resistance when first switch switches on and the second switch disconnection, Vy1 is the second detected voltage that gathers on the second resistance when first switch switches on and the second switch disconnection, Vx2 is the third detected voltage that gathers on the first resistance when first switch disconnection and the second switch switches on, Vy2 is the fourth detected voltage that gathers on the second resistance when first switch closure and the second switch disconnection.
The push-to process of the above formula is briefly described as follows:
when the first switch S1 is turned on and the second switch S2 is turned off, it can be found with reference to fig. 2 that:
when the first switch S1 is turned off and the second switch S2 is turned on, it can be found with reference to fig. 3 that:
for the convenience of calculation, parallel connection of Rx and R1 is equivalent to Rp, parallel connection of Ry and R2 is equivalent to Rn, and the following steps are performed:
wherein Rp is Rx// R1, and Rn is Ry// R2.
Using admittance conversion to obtain:
wherein,
further obtaining:
the definitions of Rn and Rp can be converted to:
Zx＝Zp-Z3，Zy＝Zn-Z3；
conversion to Rx, Ry:
combining the above to obtain:
in the insulation detection process, since the voltage sampling circuit 200 itself has a certain resistance when it collects the detection voltage of the detection resistor, such a resistance value may have a large influence on the calculation of the leakage resistance when the calculated leakage resistance value is relatively small (for example, less than 20K Ω), and therefore, the detection voltage may be calibrated in advance in order to further optimize the detection result.
Optionally, referring to fig. 1, the bilateral dc insulation detection system may further include: the module 400 is calibrated.
And the calibration module 400 is connected with the processing module 300 and is used for performing linear fitting calibration on the leakage resistance calculated by the processing module according to a preset linear fitting calibration rule, wherein the linear fitting calibration rule is obtained after the leakage resistance calculated by the standard leakage resistance simulates the leakage condition and the corresponding standard leakage resistance are subjected to linear fitting.
In this embodiment, a standard leakage resistor (composed of a standard resistor with a known resistance value) may be loaded to simulate a leakage situation of a charging pile, then a bilateral dc insulation detection system is used to perform insulation detection, the leakage resistor is obtained through calculation, and the calculated leakage resistor and the standard leakage resistor are linearly fitted to obtain a linear fitting relationship therebetween (for example, y is 0.0037x + 0.9786).
According to the embodiment of the invention, the detection resistors with different resistance values are arranged between the positive electrode and the ground wire and between the negative electrode and the ground wire in an unbalanced bridge mode, so that the condition of misjudgment of the existing bilateral insulation detection can be avoided, the insulation detection of unilateral and bilateral leakage can be further met, the application range is wide, and the reliability of the insulation detection is also ensured. In addition, the deviation of the calculated leakage resistance is also reduced by linear fitting, and the accuracy of judgment is mentioned.
Example two
The embodiment of the invention provides a bilateral direct-current insulation detection method, which adopts the system described in the first embodiment and can comprise the following steps:
and step S11, setting detection resistors with different resistance values between the positive pole and the ground wire and between the negative pole and the ground wire of the charging pile output direct-current power supply in an unbalanced bridge mode.
In this embodiment, since the insulation detection in the prior art adopts a balanced bridge manner, that is, the detection resistors with the same resistance values are arranged between the positive electrode and the ground line and between the negative electrode and the ground line, when the two collected detection voltages are the same, the misjudgment condition that the positive electrode and the negative electrode have no electric leakage occurs because the voltages between the positive electrode and the ground line and between the negative electrode and the ground line are the same. And adopt the mode of unbalanced bridge, set up the detection resistance that the resistance value is different between anodal and ground wire and between negative pole and ground wire, can avoid the condition of above-mentioned erroneous judgement to appear, and then can satisfy unilateral (anodal or negative pole electric leakage) and bilateral (anodal and negative pole electric leakage simultaneously) the insulation detection of electric leakage, ensured insulation detection's reliability.
Alternatively, the step S11 can be implemented as follows:
a first resistor is connected in series between the positive electrode of the direct current power supply output by the charging pile and the ground wire, and a second resistor is connected in series between the negative electrode of the direct current power supply output by the charging pile and the ground wire;
and a third resistor and a first switch are connected in series between the positive electrode of the charging pile for outputting the direct current power supply and the ground wire, and a fourth resistor and a second switch are connected in series between the negative electrode of the charging pile for outputting the direct current power supply and the ground wire.
Further, the first resistor and the second resistor have the same resistance value, and the third resistor and the fourth resistor have the same resistance value.
In the present embodiment, the first switch S1 and the second switch S2 may be controlled by the processing module 300, when the first switch S1 is turned on and the second switch S2 is turned off, the first resistor R1 and the third resistor R3 are connected in parallel to form a detection resistor between the positive electrode and the ground, and the second resistor R2 is a detection resistor between the negative electrode and the ground; when the first switch S1 is turned off and the second switch S2 is turned on, the first resistor R1 is a detection resistor between the positive electrode and the ground, and the second resistor R2 and the fourth resistor R4 are connected in parallel to form a detection resistor between the negative electrode and the ground.
And step S12, collecting the detection voltage on all the detection resistors.
And step S13, calculating the leakage resistance between the positive pole and the ground wire and/or between the negative pole and the ground wire of the direct current power supply output by the charging pile according to a preset algorithm and the received detection voltage.
Specifically, the step S13 can be implemented as follows:
calculating the leakage resistance Rx between the positive electrode and the ground wire of the charging pile output direct-current power supply and the leakage resistance Ry between the negative electrode and the ground wire according to the following formula:
wherein, R1 is the resistance value of first resistance, R3 is the resistance value of third resistance, Vx1 is the first detected voltage that gathers on the first resistance when first switch switches on and the second switch disconnection, Vy1 is the second detected voltage that gathers on the second resistance when first switch switches on and the second switch disconnection, Vx2 is the third detected voltage that gathers on the first resistance when first switch disconnection and the second switch switches on, Vy2 is the fourth detected voltage that gathers on the second resistance when first switch closure and the second switch disconnection.
It should be noted that the calculation pushing process of the above formula is already given in the first embodiment, and is not described here again.
In the insulation detection process, since the voltage sampling circuit 200 itself has a certain resistance when it collects the detection voltage of the detection resistance, such a resistance value may have a large influence on the calculation of the leakage resistance when the calculated leakage resistance value is relatively small, and therefore, the detection voltage may be calibrated in advance in order to further optimize the detection result.
Optionally, referring to fig. 4, the method may further include:
and step S14, performing linear fitting calibration on the calculated leakage resistance according to a preset linear fitting calibration rule, wherein the linear fitting calibration rule is obtained after linear fitting is performed on the calculated leakage resistance and the corresponding standard leakage resistance when the leakage condition is simulated through the standard leakage resistance.
According to the embodiment of the invention, the detection resistors with different resistance values are arranged between the positive electrode and the ground wire and between the negative electrode and the ground wire in an unbalanced bridge mode, so that the condition of misjudgment of the existing bilateral insulation detection can be avoided, the insulation detection of unilateral and bilateral leakage can be further met, the application range is wide, and the reliability of the insulation detection is also ensured. In addition, the deviation of the calculated leakage resistance is also reduced by linear fitting, and the accuracy of judgment is mentioned.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A bilateral direct current insulation detection system, characterized by includes:
the detection circuit is respectively connected with the anode, the cathode and the ground wire of the direct-current power supply output by the charging pile and is used for arranging detection resistors with different resistance values between the anode and the ground wire and between the cathode and the ground wire in an unbalanced bridge mode;
the voltage sampling circuit is connected with the detection circuit and is used for collecting detection voltages on all the detection resistors;
the processing module is connected with the voltage sampling circuit and used for calculating the leakage resistance between the positive electrode and the ground wire and/or between the negative electrode and the ground wire of the direct-current power supply output by the charging pile according to a preset algorithm and the received detection voltage;
and the calibration module is connected with the processing module and used for performing linear fitting calibration on the leakage resistance calculated by the processing module according to a preset linear fitting calibration rule, wherein the linear fitting calibration rule is obtained after the leakage resistance calculated by the standard leakage resistance and the corresponding standard leakage resistance are subjected to linear fitting when the leakage condition is simulated by the standard leakage resistance.
2. The system of claim 1, wherein the detection circuit comprises: a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, a second switch,
two ends of the first resistor are respectively connected with the anode of the direct-current power supply output by the charging pile and the ground wire; two ends of the second resistor are respectively connected with the negative electrode of the direct-current power supply output by the charging pile and the ground wire; one end of the third resistor is connected with the anode of the charging pile output direct-current power supply, and the other end of the third resistor is connected with the ground wire through the first switch; one end of the fourth resistor is connected with the negative electrode of the charging pile for outputting the direct-current power supply, and the other end of the fourth resistor is connected with the ground wire through the second switch.
3. The system of claim 2, wherein the first resistor has the same resistance as the second resistor, and the third resistor has the same resistance as the fourth resistor.
4. The system of claim 3, wherein the processing module is further configured to calculate the leakage resistance Rx between the positive electrode and the ground of the charging pile output DC power supply and the leakage resistance Ry between the negative electrode and the ground according to the following formula:
wherein, R1 is the resistance value of first resistance, R3 is the resistance value of third resistance, Vx1 is the first detected voltage that gathers on the first resistance when first switch switches on and the second switch disconnection, Vy1 is the second detected voltage that gathers on the second resistance when first switch switches on and the second switch disconnection, Vx2 is the third detected voltage that gathers on the first resistance when first switch disconnection and the second switch switches on, Vy2 is the fourth detected voltage that gathers on the second resistance when first switch closure and the second switch disconnection.
5. A bilateral direct current insulation detection method is characterized by comprising the following steps:
detecting resistors with different resistance values are arranged between the positive electrode and the ground wire and between the negative electrode and the ground wire of the direct-current power supply output by the charging pile in an unbalanced bridge mode;
collecting detection voltages on all detection resistors;
calculating the leakage resistance between the positive electrode of the direct current power supply output by the charging pile and the ground wire and/or between the negative electrode of the direct current power supply output by the charging pile and the ground wire according to a preset algorithm and the received detection voltage;
and performing linear fitting calibration on the calculated leakage resistance according to a preset linear fitting calibration rule, wherein the linear fitting calibration rule is obtained by performing linear fitting on the calculated leakage resistance and a corresponding standard leakage resistance when the leakage condition is simulated through the standard leakage resistance.
6. The method of claim 5, wherein the step of setting the detection resistors with different resistance values between the positive pole and the ground line and between the negative pole and the ground line of the charging pile output direct-current power supply by using the unbalanced bridge comprises the following steps:
a first resistor is connected in series between the positive electrode of the direct current power supply output by the charging pile and the ground wire, and a second resistor is connected in series between the negative electrode of the direct current power supply output by the charging pile and the ground wire;
and a third resistor and a first switch are connected in series between the positive electrode of the charging pile for outputting the direct current power supply and the ground wire, and a fourth resistor and a second switch are connected in series between the negative electrode of the charging pile for outputting the direct current power supply and the ground wire.
7. The method of claim 6, wherein the first resistor has the same resistance as the second resistor, and the third resistor has the same resistance as the fourth resistor.
8. The method according to claim 7, wherein the calculating of the leakage resistance between the positive electrode and the ground wire and/or between the negative electrode and the ground wire of the charging pile output DC power supply according to a preset algorithm and the received detection voltage comprises:
calculating the leakage resistance Rx between the positive electrode and the ground wire of the charging pile output direct-current power supply and the leakage resistance Ry between the negative electrode and the ground wire according to the following formula:
wherein, R1 is the resistance value of first resistance, R3 is the resistance value of third resistance, Vx1 is the first detected voltage that gathers on the first resistance when first switch switches on and the second switch disconnection, Vy1 is the second detected voltage that gathers on the second resistance when first switch switches on and the second switch disconnection, Vx2 is the third detected voltage that gathers on the first resistance when first switch disconnection and the second switch switches on, Vy2 is the fourth detected voltage that gathers on the second resistance when first switch closure and the second switch disconnection.
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