CN218412683U

CN218412683U - Residual current testing device

Info

Publication number: CN218412683U
Application number: CN202222142709.8U
Authority: CN
Inventors: 李超
Original assignee: Shenzhen Tengrui Microelectronics Technology Co ltd
Current assignee: Shenzhen Tengrui Microelectronics Technology Co ltd
Priority date: 2022-08-15
Filing date: 2022-08-15
Publication date: 2023-01-31
Anticipated expiration: 2032-08-15

Abstract

The utility model provides a residual current testing arrangement, which comprises a housin, be provided with on the casing: a plurality of live wire interfaces; a ground wire interface; the resistance assembly is provided with a plurality of resistance gears and is connected between the live wire interface and the ground wire interface to form a test circuit; the gear switch is connected with the resistance assembly and used for selecting a resistance gear of the resistance assembly to be connected to the test circuit according to operation; the detection circuit is connected with the test circuit and used for detecting the resistance value of the resistor assembly connected to the test circuit and detecting the residual current flowing through the test circuit; and the display screen is used for displaying the residual current and the resistance value. The testing, gear adjustment and resistance and residual current measurement are integrated in one device, and the measurement parameters and results can be obtained by a user in time through display screen display, so that the whole testing process is simple and convenient to operate.

Description

Residual current testing device

Technical Field

The embodiment of the application belongs to the technical field of charging, and particularly relates to a residual current testing device.

Background

At present, the electric automobile industry is vigorously developed, the safety problem of electric automobile charging needs to be guaranteed, one key charging safety performance index is the residual current protection function, when residual current exists in the charging process of electric automobile charging equipment (hereinafter referred to as charging pile for short), the charging pile can monitor in real time, and the output of the charging pile is timely disconnected, so that the safety of the electric automobile and users is guaranteed, and the safety performance index is very important. In order to ensure that the residual current protection function of the charging pile meets the charging safety requirements of electric automobiles with various national standards, the safety function test of the charging pile needs to be accurately and efficiently executed.

The existing test mode of present trade needs many equipment concatenation, and the test is inconvenient, and gear regulation mode has hand formula and hand propelled two kinds, and two kinds of regulation mode are harder.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a residual current testing device, and aims to solve at least one problem.

The embodiment of the application provides a first aspect provides a residual current testing device, including the casing, be provided with on the casing:

the live wire interfaces are used for connecting to live wires of the charging piles;

the ground wire interface is used for connecting the ground wire of the charging pile;

the resistance assembly is provided with a plurality of resistance gears and is connected between the live wire interface and the ground wire interface to form a test circuit;

the gear switch is connected with the resistance component and used for selecting a resistance gear of the resistance component to be connected to the test circuit according to operation;

the detection circuit is connected with the test circuit and used for detecting the resistance value of the resistor assembly connected to the test circuit and detecting the residual current flowing through the test circuit;

and the display screen is connected with the detection circuit and is used for displaying the residual current and the resistance value.

In one embodiment, the range switch is further configured to adjust the range of resistance values of the selected range of resistance values.

In one embodiment, the gear switch is a knob pressing switch, the resistance gear is selected when the knob pressing switch is pressed, and the resistance value range of the selected resistance gear is adjusted when the knob pressing switch is rotated.

In one embodiment, the resistor assembly includes more than two impedance branches with different impedances, and each impedance branch corresponds to one resistor stage.

In one embodiment, each of the impedance branches includes a fixed resistor, a switch connected to the knob pressing switch, and an adjustable resistor connected to the knob pressing switch, which are connected in series, where the fixed resistors on the impedance branches have different resistances.

In one embodiment, the adjustable resistors in the impedance branches have different resistance ranges.

In one embodiment, the switch further comprises a switch having an output and at least two inputs, the at least two inputs of the switch are respectively connected to the corresponding live interfaces, and the output of the switch is connected to the resistor array.

In one embodiment, the detection circuit includes a current meter and a resistance sensor;

the ammeter is connected in series with the test circuit, is connected with the display screen, and is used for detecting residual current flowing through the test circuit and outputting the residual current to the display screen;

the resistance sensor is connected between the test circuit and the display screen and used for detecting the resistance value of the resistance component connected to the test circuit and outputting the resistance value to the display screen.

In one embodiment, the ammeter is provided with a detachable fuse.

In one embodiment, the live and ground interfaces are terminals.

The residual current testing device that this application embodiment provided can the lug connection fill electric pile through live wire, ground wire interface to with test, gear adjustment and resistance and residual current's measurement integration in a device, and show through the display screen, the user can obtain measurement parameter and result immediately, whole test procedure easy and simple to handle.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, 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 test wiring diagram of a residual current testing device provided by an embodiment of the present application;

fig. 2 is a schematic structural diagram of a residual current testing device according to an embodiment of the present application;

fig. 3 is a circuit schematic diagram of a residual current testing device according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions of the embodiments of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.

The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first", "second", and "third", etc. are used to distinguish different objects, and are not used to describe a particular order. In the description of this application, "plurality" means two or more, several "means one or more, and the symbol"/"means either, unless specifically limited otherwise.

Referring to fig. 1 to 3, an embodiment of the present application provides a residual current testing device 100 (hereinafter referred to as a testing device), which includes a housing 101, wherein the housing 101 is provided with a plurality of live wire interfaces L1', L2', a ground wire interface PE ', a resistor assembly 110, a shift switch 120, a detection circuit 130, and a display screen 140. It can be appreciated that the test apparatus 100 of the present application, which assembles the individual modules/circuits in a single housing, is more convenient to use than the prior art approach of multi-device splicing.

The plurality of live wire interfaces L1', L2' are used for connecting to the live wires L1, L2 of the charging pile 200;

the ground wire interface PE' is used for connecting to the ground wire PE of the charging pile 200; the wiring is convenient, easy operation.

For example, in the testing device 100 for charging the electric pile 200 (e.g., according to the american standard, the national standard, or other standards), there should be two live wire interfaces L1', L2', which are respectively used for connecting two different live wires L1, L2 and the ground wire PE to form a testing loop for testing.

For another example, in the testing apparatus 100 for the three-phase output charging pile 200, there should be three live wire interfaces, which are respectively used for connecting three different live wires and ground wires to form a testing loop for testing.

It is understood that the charging post 200 may be an ac charging post or a dc charging post, preferably the charging post 200 is an ac charging post, and further preferably the charging post 200 is a american-standard ac charging post.

The resistor assembly 110 has a plurality of resistor levels S1, S2, S3 connected between the hot and ground connections L1', L2' and PE ' to form a test circuit, which is understood to be part of the test loop described above. The resistor assembly 110 is provided with a plurality of selectable gears with different impedances, and can be compatible with residual current gear tests under different conditions.

The shift switch 120 is connected with the resistor assembly 110 and used for selecting the resistor shift S1/S2/S3 of the resistor assembly 110 to be connected to a test line according to operation, and operation is simple.

The detection circuit 130 is connected to the test line, and is used for detecting the resistance value of the resistor assembly 110 connected to the test line and detecting the residual current flowing through the test line.

The display screen 140 is connected to the detection circuit 130 for displaying the residual current and the resistance value of the resistor assembly 110 connected to the test circuit. The magnitude of simulation resistance value and residual current value can be shown simultaneously on a display screen 140, and the test data record of being convenient for is filed, and is convenient for judge whether accord with within the standard that fills electric pile 200 residual current protect function regulation.

Optionally, range switch 120 is also used to adjust within a selected range of resistance values for resistor ranges S1/S2/S3. It will be appreciated that each resistor stage S1, S2, S3 in the resistor assembly 110 has a corresponding range of resistance values that a user can select by adjusting the range switch 120 to the corresponding range of resistance values. In one example, the position switch 120 is a knob-pressing switch, the resistance position S1/S2/S3 is selected when the knob-pressing switch is pressed, and the knob-pressing switch is rotated to adjust the resistance value within the selected resistance position S1/S2/S3, so that the operation is simple.

In one embodiment, the resistor assembly 110 forms a resistor array, which includes more than two impedance branches with different impedances, and each impedance branch corresponds to one resistor stage. In this embodiment, three

impedance branches

111, 112, and 113 are provided, and the three

impedance branches

111, 112, and 113 correspond to three resistance steps S1, S2, and S3, respectively.

A user can select the corresponding impedance branch circuit 111/112/113 to be connected into the test loop through the gear switch 120, so that a required resistance range is obtained, key switching and knob fine tuning are adopted, tedious operation steps of a hand-shaking type, a push-pull type and a knob type are avoided, and time cost is saved to a certain extent.

The impedance branch 111 comprises a fixed resistor R1, a switch K1 connected with the knob push switch and an adjustable resistor R11 connected with the knob push switch K1 which are connected in series; the impedance branch 112 comprises a fixed resistor R2, a switch K2 connected with the knob push switch and an adjustable resistor R12 connected with the knob push switch K2 which are connected in series; the impedance branch 113 includes a fixed resistor R3, a switch K3 connected to the knob pressing switch, and an adjustable resistor R13 connected to the knob pressing switch K3, which are connected in series.

The fixed resistors R1, R2, and R3 on the

impedance branches

111, 112, and 113 have different resistances. Optionally, the adjustable resistors R11, R12, and R13 in the

respective impedance branches

111, 112, and 113 have different resistance ranges. To facilitate adjustment of the appropriate analog resistance.

For example, the testing device 100 of the present application has three gear knobs, wherein:

the analog resistance value of the first resistor gear S1 is 500 +/-50 omega (the adjustable range is 450 omega-550 omega), namely the resistance value of the fixed resistor R1 is 450 omega, and the resistance value of the adjustable resistor R11 is 0-100 omega;

the analog resistance value of the second resistor gear S2 is 1200 +/-200 omega (the adjustable range is 1000 omega-1400 omega), namely the resistance value of the fixed resistor R2 is 1000 omega, and the resistance value of the adjustable resistor R12 is 0-400 omega;

the analog resistance value of the third resistance gear S3 is 6000 plus or minus 500 omega (the adjustable range is 5500 omega-6500 omega), namely the resistance value of the fixed resistance R3 is 5500 omega, and the resistance value range of the adjustable resistance R13 is 0-1000 omega.

Pressing down one of three knob press switch K1, K2, K3, the residual current that the test corresponds resistance position S1, S2, S3, if the residual current value that records has the difference apart from the target value, can adjust the size of the simulation resistance value who inserts test circuit through rotatory knob press switch K1/K2/K3, thereby try to obtain the required target residual current value of test, if can obtain then explain to fill electric pile and accord with corresponding standard, if can not obtain then explain to fill electric pile and do not accord with corresponding standard.

Three kinds of resistance gears S1, S2, S3 can satisfy different fender position demands of test resistance of beautiful mark charging pile residual current. Compared with the conventional hand-operated or push-pull rheostat, the rheostat has the advantages of small volume, light weight, convenience in movement and the like; compare in knob formula rheostat, possess the advantage that bears the heavy current, satisfy the test requirement that American standard alternating-current charging stake residual current full power kept off the position.

In one embodiment, the testing apparatus 100 further includes a switch S11, the switch S11 has an output and at least two inputs, at least two inputs of the switch S11 are respectively connected to the corresponding live interfaces L1', L2', and an output of the switch S11 is connected to the resistor assembly 110.

In one example, an alternating current power supply is powered on, a target voltage is set, an output of the alternating current power supply is turned on, the charging pile 200 starts to work, the on-off of two live wires L1 and L2 of the charging pile 200 and the testing device 100 is controlled by using a change-over switch S11, such as an air switch, and when the live wire L1 is communicated with the testing device 100, the residual current of a line of the live wire L1 to the ground wire PE is tested; when the live wire L2 is connected to the testing device 100, the residual current of the live wire L2 line to the ground wire PE is tested. The switch S11 may be a single-pole, multi-throw switch.

The live wire interfaces L1', L2' and the ground wire interface PE ' of the application are three screw binding posts; the on-off of the live wire interfaces L1 'and L2' of the line is controlled by the change-over switch S11, when the change-over switch S11 is in a pressed state, a loop of the live wire interface L1 'is closed, the live wire interface L2' is disconnected, and at the moment, the residual current of the live wire L1 line to the ground wire PE is tested; when the switch S11 is not pressed, the loop of the live wire interface L2 'is closed and the live wire interface L1' is opened, and then the residual current of the live wire L2 line to the ground PE is tested.

In one embodiment, the detection circuit 130 includes a current meter 132 and a resistance sensor 134.

The ammeter 132 is connected in series to the test line and is connected to the display screen 140, and is configured to detect a residual current flowing through the test line and output the residual current to the display screen 140.

The resistance sensor 134 is connected between the test line and the display screen 140, and is used for detecting the resistance value of the resistance component 110 connected to the test line and outputting the resistance value to the display screen 140.

In this application, adopt integral type composite set, combine ammeter 132 and resistance component 110 together, reduced some wiring steps, this testing arrangement 100 only need connect live wire interface L1', L2' and the three terminal of ground wire interface PE 'PE, compares disconnect-type test scheme, has saved this part's of ammeter 132 series circuit wiring step, for test platform build with disassemble the time of having saved.

In one embodiment, the ammeter 132 is provided with a removable fuse. When the residual current is too large, the fuse is immediately fused, so that the circuits and devices in the whole testing device 100 are protected from being damaged, and the fuse can be restored to be normal after being replaced.

Optionally, the testing device 100 is further provided with a battery compartment, into which a battery may be installed, primarily for powering the display screen 140.

The testing device 100 is suitable for testing the residual current of the alternating-current charging pile 200 of the electric automobile, not only has all functions of a testing scheme in the current industry, but also simplifies testing operation steps, and has remarkable effects on function optimization and integration and time saving cost.

In addition, by adopting a mode of combining the resistor array and the ammeter 132, part of circuit consumables in the current industry scheme is saved, the material cost is saved to a certain extent, and the ammeter has certain economic value.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. The utility model provides a residual current testing device which characterized in that, includes the casing, be provided with on the casing:

the plurality of live wire interfaces are used for connecting to live wires of the charging piles;

the resistance assembly is provided with a plurality of resistance gears and is connected between the fire wire interface and the ground wire interface to form a test circuit;

the gear switch is connected with the resistance assembly and used for selecting a resistance gear of the resistance assembly to be connected to the test circuit according to operation;

the detection circuit is connected with the test circuit and is used for detecting the resistance value of the resistor assembly connected to the test circuit and detecting the residual current flowing through the test circuit;

2. The residual current testing device of claim 1, wherein the range switch is further configured to adjust within a selected range of resistance values for the range of resistance values.

3. The residual current testing device according to claim 1 or 2, characterized in that the shift switch is a knob-operated push switch, the knob-operated push switch is pushed to select the resistor shift position, and when the knob-operated push switch is rotated, the switch is adjusted within the selected range of the resistor shift position.

4. The residual current testing device of claim 3, wherein the resistor assembly comprises more than two impedance branches with different impedances, and each impedance branch corresponds to one resistor gear.

5. The residual current testing device according to claim 4, wherein each of the impedance branches comprises a fixed resistor, a switch connected to the knob-pressing switch, and an adjustable resistor connected to the knob-pressing switch, which are connected in series, wherein the fixed resistors of the impedance branches have different values.

6. The residual current testing device according to claim 5, characterized in that the adjustable resistance ranges of the impedance branches are different.

7. The residual current testing device according to claim 1, further comprising a switch having an output and at least two inputs, wherein the at least two inputs of the switch are respectively connected to the corresponding live wire interfaces, and wherein the output of the switch is connected to the resistive component.

8. The residual current testing device of claim 1, wherein the detection circuit comprises a current meter and a resistance sensor;

9. The residual current testing device of claim 8, wherein the ammeter is provided with a removable fuse.

10. The residual current testing device of claim 1, wherein the live and ground interfaces are terminals.