Personnel protection testing device for charging pile

Abstract

The utility model discloses a charging pile personnel protection testing device, which comprises a variable frequency power supply, an adjustable load, a detection module, a switch module and an oscilloscope, and is characterized in that the variable frequency power supply is used for providing an adjustable power supply for a charging pile sample, and the adjustable load is used for simulating a real charging process; the detection module is connected between the output end of the charging pile sample and the input end of the adjustable load during testing, and comprises a grounding detection module, a high-impedance grounding fault detection module and a low-impedance grounding fault detection module; and the switch module is used for carrying out circuit switching among the grounding detection module, the high-impedance grounding fault detection module and the low-impedance grounding fault detection module. According to the utility model, simulation and detection of various faults can be directly, simply and conveniently realized in one set of device, and an automobile simulation device is provided at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the safety performance test equipment technical field of charging pile. BACKGROUND

[0002] At present, the mainstream charging pile on the domestic market is tested, and the technical basis is mainly based on the standards related to IEC and GB / T. The testing aspects of these standards mainly concentrate on the testing and detection of guide control, conventional electric shock prevention and conventional electric performance verification. There is no special testing related to personnel protection of the charging pile system used in the North American market.

[0003] The charging pile system in the North American market is based on the standards related to UL. There are special requirements for personnel protection functions. These functions are: grounding detection (Grounding Monitoring Interrupter), high-impedance ground fault (High-resistance Ground fault) and low-impedance ground fault (Low-resistance Ground fault).

[0004] In order to adapt to the relevant standards of the North American market for charging pile products export, perfect the related test, need to research and develop the testing device of charging pile personnel protection. UTILITY MODEL CONTENT

[0005] The purpose of the utility model is to meet the actual demand, provide a kind of charging pile personnel protection test device, further perfect the quality and safety performance evaluation of charging pile.

[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0007] A kind of charging pile personnel protection test device, including variable frequency power supply, adjustable load, detection module, switch module and oscilloscope, the variable frequency power supply is used to provide adjustable power supply for charging pile sample, the adjustable load is used to simulate real charging process, the detection module is connected between the output end of charging pile sample and the input end of adjustable load when testing, the detection module includes grounding detection module, high-impedance ground fault detection module and low-impedance ground fault detection module, the switch module is used for circuit switching;When grounding detection, switch module connects grounding detection module and oscilloscope, for detecting unacceptable impedance in ground circuit;When high-impedance ground fault detection, switch module connects high-impedance ground fault detection module and oscilloscope, for testing protection time and obtaining ground fault current action value;When low-impedance ground fault detection, switch module connects low-impedance ground fault detection module and oscilloscope, disconnects adjustable load, to simulate low resistance ground fault.

[0008] Further, the ground detection module contains a first adjustable impedance circuit, which is connected to the adjustable resistance in the ground loop of the variable frequency power supply and the adjustable load, to achieve continuous change of the ground impedance and cause the charging power supply circuit to be interrupted, so as to achieve the purpose of ground fault (unacceptable impedance).

[0009] Further, the charging pile personnel protection test device further comprises an environmental box, and the to-be-tested charging pile sample is placed in the environmental box during ground detection, and is tested at 25 DEG C, 40 DEG C, -5 DEG C and -25 DEG C respectively.

[0010] Further, the high-impedance ground fault detection module contains a second adjustable impedance circuit, which is connected to the adjustable resistance in the ground loop of the adjustable load, to introduce the fault into the ground line, so as to cause the ground fault; the connected oscilloscope is used to capture the fault introduction signal and the protection cutoff signal, so as to obtain the protection time and record the action resistance value, and obtain the action value of the ground fault current.

[0011] Further, in the circuit state that the switch module is connected to the high-impedance ground fault detection module and the oscilloscope, the variable frequency power supply is set to have a line test voltage of 85%, 100% and 110% of the rated value respectively.

[0012] Further, the fault introduction signal captured by the oscilloscope is the voltage and current values when the fault occurs; the protection cutoff signal refers to the protection time. When the ground fault occurs, the charging pile opens the leakage protection, the voltage is changed from the phase voltage before the switch is closed to zero, the charging pile working current is changed to zero, and the time between the two zero points is the protection time.

[0013] Further, the low-impedance ground fault detection module contains a third adjustable impedance circuit, which is connected to the equivalent resistances R1 and R2 in the input side and the output side of the charging pile sample respectively, and is connected to a 1-A fuse at the position of the conductive part of the charging pile shell which can be touched, to introduce the current close to overload into the charging circuit to simulate the ground fault.

[0014] Further, the charging pile personnel protection test device further comprises a communication module and an HMI interactive terminal, the communication module is used for collecting signals of the detection module, the switch module and the oscilloscope and issuing control instructions, and the HMI interactive terminal is used for displaying three kinds of detection information and generating control codes and receiving interactive instructions to the communication module.

[0015] The utility model discloses the beneficial effect:

[0016] Compared with the detection device provided by the current market, the charging pile personnel protection test device can directly, simply and conveniently carry out ground detection, high impedance ground fault and low impedance ground fault test, and can provide more comprehensive product safety measure for manufacturers who plan to export the charging pile to the North American market.

[0017] The charging pile personnel protection test device provided by the utility model not only realizes simulation and detection of various faults in a set of device, but also provides an automobile simulation device.

[0018] The technical scheme of the utility model will be illustrated by examples in combination with the drawings and embodiments. DRAWINGS

[0019] Figure 1 is the schematic structural diagram of the charging pile personnel protection test device provided by the utility model embodiment.

[0020] Figure 2 is one kind of connection mode example of the circuit of the first adjustable impedance contained in the ground detection module of the charging pile personnel protection test device provided by the utility model embodiment.

[0021] Figure 3 is one kind of connection mode example of the circuit of the second adjustable impedance contained in the high impedance ground fault detection module of the charging pile personnel protection test device provided by the utility model embodiment.

[0022] Figure 4 is one kind of connection mode example of the circuit of the third adjustable impedance contained in the low impedance ground fault detection module of the charging pile personnel protection test device provided by the utility model embodiment.

[0023] REFERENCE SIGNS:

[0024] 1 variable frequency power supply, 2 adjustable load

[0025] 3 detection module, 301 ground detection module, 302 high impedance ground fault detection module,

[0026] 303 low impedance ground fault detection module

[0027] 4 switch module, 5 oscilloscope, 6 communication module, 7 HMI interactive terminal, 8 charging pile DETAILED DESCRIPTION

[0028] The specific embodiments described herein are only used to explain the technical scheme of the patent, and not to limit the disclosed technical scheme. In addition, it should be noted that, in order to facilitate description, only part of the structure related to the technical scheme of the application is shown in the drawings.

[0029] Before discussing the example embodiments in more detail, it should be mentioned that the structure of the device components and / or modules mentioned in the embodiments, if not specified in detail, is understood by the person skilled in the art on the basis of the prior art or is a commercially available product.

[0030] Reference Figure 1 The embodiment provides a charging pile personnel protection test device, which comprises a variable frequency power supply 1, an adjustable load 2, a detection module 3, a switch module 4 and an oscilloscope 5. The variable frequency power supply 1 is used for providing an adjustable power supply for a charging pile sample. The adjustable load 2 is used for simulating a real charging process. The detection module 3 is connected between the output end of the charging pile sample and the input end of the adjustable load 2 during testing. The detection module 3 comprises a ground detection module 301, a high-impedance ground fault detection module 302 and a low-impedance ground fault detection module 303. The switch module 4 is used for circuit switching. During ground detection, the switch module 4 connects the ground detection module 301 and the oscilloscope 5, and is used for detecting unacceptable impedance in the ground circuit. During high-impedance ground fault detection, the switch module 4 connects the high-impedance ground fault detection module 302 and the oscilloscope 5, and is used for testing a protection time and obtaining a ground fault current action value. During low-impedance ground fault detection, the switch module 4 connects the low-impedance ground fault detection module 303 and the oscilloscope 5, and is used for disconnecting the adjustable load 2 and simulating a low-resistance ground fault.

[0031] Reference Figure 2 The ground detection module 301 comprises a circuit with a first adjustable impedance. The circuit is connected with an adjustable resistor in series in the ground loop of the variable frequency power supply 1 and the adjustable load 2, so that the ground impedance can be continuously changed and the charging power supply circuit is interrupted, and the purpose of ground fault (unacceptable impedance) is achieved. Under normal working conditions, the ground resistance is gradually increased from small to large until the charging pile is disconnected for protection. The output current can be observed by the oscilloscope to decrease from a normal value to zero, and the protection function is achieved. The protection time is different for different products, and no timing requirement is made. The charging pile is powered on, and no current output should be generated from the charging pile, which can be determined by observing the current with the oscilloscope.

[0032] During ground detection, the charging pile sample to be tested is placed in an environmental box, and tests are respectively performed at temperatures of 25℃, 40℃, -5℃ and -25℃.

[0033] Reference Figure 2 The high-impedance ground fault detection module 302 comprises a circuit with a second adjustable impedance. The circuit is connected with an adjustable resistor in series in the ground loop of the adjustable load 2, so that a fault is introduced into the ground line to cause a ground fault. The connected oscilloscope 5 is used for capturing the fault introduction signal and the protection cutoff signal, so as to obtain the protection time and record the action resistance value, and obtain the ground fault current action value.

[0034] Switch module 4 connects high impedance ground fault detection module 302 and oscilloscope 5 circuit state, through the variable frequency power supply 1 set line test voltage is 85%, 100% and 110% of the rated value, respectively, with adjustable resistance at 500 ohms fault test ten times.

[0035] The fault introduction signal captured by the oscilloscope 5 is the voltage and current value at the time of the fault; the protection cut-off signal refers to the protection time. When a ground fault occurs, the leakage protection of the charging pile is turned on, the voltage will be reduced from the phase voltage before the switch is closed to zero, and the charging pile working current will be reduced to zero. The time between the two zeros is the protection time.

[0036] Reference Figure 3 The low impedance ground fault detection module 303 contains a third adjustable impedance circuit, which is connected to the input side and output side of the charging pile sample respectively, and the equivalent resistance R1 and R2 are connected, and a 1-A fuse is connected to the accessible conductive part of the charging pile shell, which is used to introduce the current close to overload into the charging circuit to simulate the ground fault.

[0037] R1 and R2 are connected in the line and load circuit, for example, resistance R1 plus R2 is adjusted to equal to 1.5 times the current value of the rated value of the device, to simulate the situation that the interruption is located near the fault but far away from the power supply.

[0038] In order to make the test personnel operate more safely and conveniently, a communication module 6 and an HMI interactive terminal can be added to the test device. The communication module 6 is used to collect the signals of the detection module 3, the switch module 4 and the oscilloscope 5 and issue control instructions; the HMI interactive terminal is used to display three kinds of detection information and control code generation, and receive interactive instructions to the communication module 6.

Claims

1. A charging post personnel protection test device, characterized in that: The utility model relates to a charging pile ground fault test system, including variable frequency power supply (1), adjustable load (2), detection module (3), switch module (4) and oscilloscope (5), variable frequency power supply (1) is used to provide adjustable power supply for charging pile sample, adjustable load (2) is used to simulate real charging process, detection module (3) is connected between the output of charging pile sample and the input of adjustable load (2) during testing, detection module (3) includes ground detection module (301), high impedance ground fault detection module (302) and low impedance ground fault detection module (303), switch module (4) is used for circuit switching, when detecting ground, switch module (4) connects ground detection module (301) and oscilloscope (5), and is used for detecting unacceptable impedance in ground circuit, when detecting high impedance ground fault, switch module (4) connects high impedance ground fault detection module (302) and oscilloscope (5), and is used for testing protection time and obtaining ground fault current action value, when detecting low impedance ground fault, switch module (4) connects low impedance ground fault detection module (303) and oscilloscope (5), and disconnects adjustable load (2), to simulate low resistance ground fault.

2. The charging station personal protection testing device of claim 1, wherein: The ground detection module (301) contains the circuit of first adjustable impedance, and the circuit is connected with adjustable resistance in the ground loop of variable frequency power supply (1) and adjustable load (2), to realize the continuous change of ground impedance, and cause the charging power supply circuit to be interrupted, to achieve the purpose of ground fault.

3. The charging station personal protection testing device of claim 1, wherein: It also includes an environmental box, and the charging pile sample to be tested is placed in the environmental box during ground detection.

4. The charging station personal protection testing device of claim 1, wherein: The high impedance ground fault detection module (302) contains the circuit of second adjustable impedance, and the circuit is connected with adjusting resistance in the ground loop of adjustable load (2) side, to cause ground fault by introducing fault into the ground wire, and the connected oscilloscope (5) is used to capture the fault introduction signal and protection cutoff signal.

5. The charging station personal protection testing apparatus of claim 1, wherein: When the switch module (4) is connected with the circuit state of high impedance ground fault detection module (302) and oscilloscope (5), the line test voltage of variable frequency power supply (1) is set as 85%, 100% and 110% of the rated value respectively.

6. The charge pile personnel protection test apparatus of claim 4, wherein: The fault introduction signal captured by the oscilloscope (5) is the voltage and current value when fault occurs, and the protection cutoff signal refers to the protection time, and the protection time refers to the time between the voltage being reduced to zero and the charging pile working current being reduced to zero after the ground fault occurs.

7. The charging station personal protection testing apparatus of claim 1, wherein: The low impedance ground fault detection module (303) contains the circuit of third adjustable impedance, and the circuit is connected with equivalent resistances R1 and R2 in the input side and output side of charging pile sample respectively, and a 1-A fuse is connected to the conductive part of charging pile shell, to introduce the current close to overload into the charging circuit to simulate ground fault.

8. The charge pile personnel protection test device of any one of claims 1-7, wherein: It also comprises a communication module (6) and an HMI interactive terminal, the communication module (6) is used to collect the signals of the detection module (3), the switch module (4) and the oscilloscope (5) and send control instructions; the HMI interactive terminal is used to display three kinds of detection information and the generation of control code, and receives interactive instructions to the communication module (6).

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