Photovoltaic engineering protection device testing apparatus and method

Abstract

The application relates to the technical field of photovoltaic equipment detection, in particular to a testing device for photovoltaic engineering protection equipment and a method thereof, which comprises a stand, a photovoltaic frame, a photovoltaic panel group arranged on the photovoltaic frame, a plurality of overcurrent testing groups arranged on one side of the top of the stand; the photovoltaic panel group comprises a plurality of photovoltaic panels installed on the photovoltaic frame, a turnover group installed between the middle part of the stand and the photovoltaic frame and a servo cylinder; the servo cylinder drives the turnover group to drive the photovoltaic frame to turn over and unfold; the overcurrent testing group comprises a fuse connected in series with a row of photovoltaic panels, a current regulator and a short-circuit generator connected in parallel to the electrodes of the current regulator. The turnover group driven by the servo cylinder is linked with the photovoltaic frame, the inclination angle of the photovoltaic panel is adjusted and the photovoltaic panel is stored, the lower support frame and the upper support frame are cooperatively driven by the servo cylinder, the photovoltaic frame can be unfolded to 30 DEG to 90 DEG to receive light or be folded to reduce the occupied space, and the photoelectric output characteristics of the photovoltaic panel in a real scene are simulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic device detection, in particular to a test device for photovoltaic engineering protection equipment and a method thereof. BACKGROUND

[0002] With the wide application of photovoltaic power generation systems, the reliability testing of protection equipment such as fuses and lightning protection devices in photovoltaic engineering has become a key link to ensure the safe operation of the system. Traditional testing devices rely on external power sources to simulate the output characteristics of photovoltaic panels, and cannot truly reflect the influence of actual light and temperature on the performance of protection equipment.

[0003] Application No. CN202311538917.2 discloses a detection device for a photovoltaic protection switch, belonging to the field of photovoltaic protection switches. The detection device for the photovoltaic protection switch includes a switch clamping frame, a switch actuating unit for pushing the handle of the switch to be tested, and a test station for installing the switch to be tested is arranged on the switch clamping frame. The switch clamping frame connects the switch to be tested with the power supply terminal through clamping action, and the switch actuating unit performs closing or opening operation on the switch to be tested according to the detection instruction. The test station is provided with a power supply terminal for power supply and a communication terminal for communication. The communication performance of the switch to be tested can be detected through the communication terminal, and the functions of the switch to be tested can be detected through the cooperation of the power supply terminal and the switch actuating unit, such as reclosing, communication and control functions. The detection device can detect the performance of the switch to be tested, ensure the performance of the switch to be tested, and avoid the safety hazards of using unqualified switches.

[0004] The above-mentioned prior art can detect the functions of the switch through the power supply terminal and the communication terminal, but its test scene is limited to static electrical parameters, and lacks the simulation capability of fuses in real working conditions, such as dynamic light and short-circuit transient current. In addition, the test environment is single, and the output characteristic changes of the photovoltaic panel under different inclination angles cannot be simulated, resulting in that the overcurrent or short-circuit test data deviates from the actual working condition.

[0005] Therefore, there is an urgent need for a test device that can integrate real light simulation and dynamic mechanical adjustment to improve the testing accuracy and operation safety of photovoltaic protection equipment. SUMMARY

[0006] In order to overcome the defects in the prior art, the purpose of the present application is to provide a test device for photovoltaic engineering protection equipment and a method thereof, which solves the problems of single scene, poor safety and insufficient data precision of traditional test devices through mechanical-electrical integrated design, and provides an efficient, safe and standardized test platform for the research and development verification and quality detection of photovoltaic protection equipment.

[0007] To achieve the above object, in one aspect, the application provides a testing device for photovoltaic engineering protection equipment, comprising a stand in a vertical frame structure, a photovoltaic frame hinged to the top of the stand, a photovoltaic panel group arranged on the photovoltaic frame, and a plurality of overcurrent testing groups arranged on one side of the top of the stand; the photovoltaic panel group comprises a plurality of photovoltaic panels mounted on the photovoltaic frame, a turnover group mounted between the middle part of the stand and the photovoltaic frame, and a servo cylinder; the servo cylinder drives the turnover group to drive the photovoltaic frame to turn over and unfold; the overcurrent testing group comprises a fuse connected in series with a row of photovoltaic panels, a current regulator, and a short-circuit generator connected in parallel to both ends of the electrode of the current regulator; an oscilloscope is arranged below each overcurrent testing group on the stand to monitor the current and voltage at both ends of the photovoltaic panel after short-circuiting.

[0008] The above arrangement realizes multi-angle self-adaptive adjustment of the testing device, ensures the authenticity of the current output of the photovoltaic panel under different light conditions, and avoids test deviation introduced by external power supply.

[0009] The short-circuit generator comprises two electrode ends arranged in opposite directions, a conductive rod vertically inserted between the two electrode ends, and a sector gear for driving the conductive rod to rise and fall; the two electrode ends are connected to both ends of the electrode of the current regulator through wires; the sector gear is fixedly connected to the top surface of the photovoltaic frame, and when the photovoltaic frame is turned over to be horizontal, the sector gear is deflected by 90 degrees, and at the same time, the conductive rod is lowered to trigger short-circuiting between the two electrode ends, so that the fuse is fused, the oscilloscope monitors the transient short-circuit current captured by the photovoltaic panel, and verifies whether the voltage is zero.

[0010] The above arrangement covers the full working condition test requirement of the fuse, can simulate the steady-state fusing characteristics of long-term overload, and can capture the breaking capacity of transient short-circuit current, so that the test data is comprehensive and reliable.

[0011] As a further improvement of the technical solution, the turnover group comprises a lower support frame rotatably connected to the middle part of the stand and an upper support frame rotatably connected between the outer end of the lower support frame and the middle part of the photovoltaic frame; the front end of the piston rod of the servo cylinder is rotatably connected to the outer end of the lower support frame; and the tail end of the servo cylinder is rotatably connected to the middle part of the stand.

[0012] As a further improvement of the technical solution, the current regulator is an electronic load for selecting different current values; the electronic load is set to "constant current mode", the load current is gradually increased to 1.5-2 times the rated value of the fuse, and the fuse is triggered.

[0013] As a further improvement of the technical solution, the current regulator is a variable resistance box, the resistance value is adjusted to change the loop current, the resistance value is gradually reduced, the current exceeds the rated value of the fuse, and the fuse is triggered.

[0014] The above setting is a mode for specifically adjusting the current size, and causes the fuse of the protection device to be fused for protection, so that the oscilloscope detects the current and voltage conditions to determine whether the quality of the batch of fuses is qualified.

[0015] As a further improvement of the technical solution, the outer side upper half of the stand is fixedly connected with a mounting plate, and the fuse, the current regulator and the oscilloscope are all mounted on the outer side of the mounting plate; a guide seat is fixedly connected to the outer side of the mounting plate and above the fuse, and two ring blocks are symmetrically arranged on the outer side of the guide seat; the electrode end is slidably connected with the ring blocks, and a spring is sleeved outside the electrode end, and the two ends of the spring are fixedly connected to the ring blocks and the end face of the electrode end, respectively.

[0016] The above setting is a design for triggering a short circuit of the circuit, and the oscilloscope records the current waveform and the voltage change of the photovoltaic panel at the moment of fusing in real time, and verifies whether the fuse is successfully disconnected by combining the characteristics that the voltage at the end of the photovoltaic panel recovers to the open-circuit voltage.

[0017] As a further improvement of the technical solution, a rack is embedded in the top inner side of the conductive rod, the rack is engaged with the sector gear, and the center axis of the sector gear is arranged in coincidence with the rotating shaft of the photovoltaic frame.

[0018] As a further improvement of the technical solution, a guide sleeve is fixedly connected to the top of the guide seat, and the guide sleeve is slidably connected with the conductive rod; the lower end of the conductive rod is made of copper material, and the electrode end is made of copper material in the shape of a circular shaft.

[0019] As a further improvement of the technical solution, a hanger is fixedly connected to the center axis of the sector gear through a pin, and the hanger is fixedly connected with the top surface of the photovoltaic frame.

[0020] As a further improvement of the technical solution, an extension frame is inserted into the bottom cross tube of the stand and on one side of the photovoltaic frame.

[0021] The above setting utilizes the photovoltaic frame to stabilize the upward turning, triggers the deflection of the sector gear, and then drives the conductive rod to descend to form a short circuit state, and through the mechanical linkage design of the sector gear and the conductive rod, the remote safe triggering of the short circuit is completed. The extension frame expands the support range to prevent the photovoltaic frame from tilting when it is unfolded, improves the wind load and mechanical vibration resistance of the device, and ensures the repeated consistency of the short circuit triggering in multiple tests.

[0022] On the other hand, the present application provides a test method for photovoltaic engineering protection equipment, which uses the test device for photovoltaic engineering protection equipment, and comprises the following steps:

[0023] S1, connect a plurality of fuses to the overcurrent test group circuit, that is, connect a row of photovoltaic panels, a plurality of fuses and a current regulator in series;

[0024] S2, the short circuit generator is connected in parallel to the two ends of the current regulator;

[0025] S3, the servo cylinder is started to drive the overturning group to drive the photovoltaic panel to be unfolded to 30-45 degrees to receive light to generate current;

[0026] S4, the load current is gradually increased by adjusting the current regulator to trigger the fuse to be blown, at this time, the oscilloscope records the blowing time and the fault current waveform, so that the overcurrent test is carried out;

[0027] S5, after replacing the new fuse, the servo cylinder is started to drive the overturning group to drive the photovoltaic panel to be unfolded to a horizontal state, then the conductive rod is inserted between a pair of electrode ends, the overcurrent test group circuit is triggered to generate a short circuit, the breaking time of the fuse and the short circuit current peak value are recorded, and whether the voltage is zero is verified;

[0028] S6, after the tests in steps S4 and S5, according to the recorded data, it is judged that the blowing time of the fuse and the current and voltage monitored by the oscilloscope are within the compliance range, so that it is judged that the batch of fuses is qualified products.

[0029] Compared with the prior art, the photovoltaic engineering protection equipment testing device and method have the following beneficial effects:

[0030] 1. The photovoltaic engineering protection equipment testing device and method, through the linkage design of the overturning group driven by the servo cylinder and the photovoltaic frame, the inclination angle adjustment and storage of the photovoltaic panel are completed, the servo cylinder drives the lower support frame and the upper support frame to act cooperatively, so that the photovoltaic frame can be unfolded to 30°-90° to receive light, or folded to reduce the occupied space, and the photoelectric output characteristics of the photovoltaic panel in a real scene are simulated.

[0031] 2. The photovoltaic engineering protection equipment testing device and method, through the double-mode overcurrent test group integrating the current regulator and the short circuit generator, the steady overload and transient short circuit test of the fuse are completed, the current regulator supports constant current mode adjustment, and the current is gradually increased to the threshold value of blowing; the full working condition test requirement of the fuse is covered, the steady blowing characteristics of long-term overload can be simulated, and the breaking capacity of the transient short circuit current can be captured, and the test data is comprehensive and reliable.

[0032] 3. The photovoltaic engineering protection equipment testing device and method, through the mechanical linkage design of the sector gear and the conductive rod, the remote safe triggering short circuit is completed, when the photovoltaic frame is unfolded, the sector gear is deflected to drive the conductive rod to be inserted into the electrode end to trigger the short circuit test, the operator does not need to be close to the high-voltage circuit, the risk of arc during manual intervention is avoided, and the test safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, although the drawings represent possible implementations as described herein, the drawings are not necessarily to scale and the dimensions of some of the elements can have been exaggerated for the sake of clarity.

[0034] Figure 1 is a schematic diagram of the overall assembly structure of the present application;

[0035] Figure 2 is a schematic diagram of the overall assembly structure of the present application;

[0036] Figure 3 is a schematic diagram of the overall assembly structure of the present application;

[0037] Figure 4 is a schematic diagram of the overall assembly structure of the present application; Figure 1

[0038] Figure 5 is a schematic diagram of the overall assembly structure of the present application;

[0039] Figure 6 is a schematic diagram of the overall assembly structure of the present application;

[0040] Figure 7 is a schematic diagram of the overall assembly structure of the present application;

[0041] The meanings of the various reference numbers in the drawings are as follows:

[0042] 100, stand; 110, extension frame; 120, photovoltaic frame; 130, mounting plate;

[0043] 200, photovoltaic panel group; 210, photovoltaic panel; 220, flip group; 221, lower support frame; 222, upper support frame; 230, servo cylinder; 240, support block;

[0044] 300, overcurrent test group; 310, fuse; 320, flow regulator; 330, short circuit generator; 331, electrode end; 3311, spring; 3312, guide seat; 332, conductive rod; 3321, rack; 3322, guide sleeve; 333, sector gear; 334, hanger; 340, oscilloscope. DETAILED DESCRIPTION

[0045] ​The details of the application can be more clearly understood with reference to the drawings and the description of specific embodiments of the application. However, the specific embodiments of the application described herein are intended for purposes of illustration only and are not intended to be limiting in any way. These together with other objects of the application, will become apparent to those skilled in the art from the following description. The terminology used or introduced herein is for the purpose of describing particular embodiments only and is not intended to be limiting in any way. The terms "mounting", "connected" should be interpreted broadly, which means direct connection, and also indirect connection through intermediate medium.

[0046] The terms "central axis", "vertical", "horizontal", "front", "back", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" and the like used herein to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, in the description of the application, the meaning of "several" is two or more, unless otherwise explicitly and specifically limited.

[0047] Please refer to Figures 1-3 As shown in the drawings, the application provides a test device for photovoltaic engineering protection equipment, which comprises a stand 100 in the form of an upright frame structure, a photovoltaic frame 120 hinged to the top of the stand 100, a photovoltaic panel group 200 arranged on the photovoltaic frame 120, and a plurality of overflow test groups 300 arranged on one side of the top of the stand 100; the photovoltaic panel group 200 comprises a plurality of photovoltaic panels 210 mounted on the photovoltaic frame 120, a turnover group 220 mounted between the middle part of the stand 100 and the photovoltaic frame 120, and a servo cylinder 230; the servo cylinder 230 drives the turnover group 220 to drive the photovoltaic frame 120 to turn over and unfold; so that the plurality of photovoltaic panels 210 on the photovoltaic frame 120 receive light;

[0048] The bottom cross tube of the stand 100 is inserted with an extension frame 110 on one side of the photovoltaic frame 120, which increases the support range by extending outward, ensuring that the center of gravity of the unfolded photovoltaic frame 120 is stable and does not fall over.

[0049] Further, the turnover group 220 comprises a lower support frame 221 rotatably connected to the middle part of the stand 100 and an upper support frame 222 rotatably connected between the outer end of the lower support frame 221 and the middle part of the photovoltaic frame 120, the front end of the piston rod of the servo cylinder 230 is rotatably connected to the outer end of the lower support frame 221, and the tail end of the servo cylinder 230 is rotatably connected to the middle part of the stand 100; starting the servo cylinder 230 to drive its piston rod to elongate, and the upper support frame 222 is turned from a drooping state to a horizontal state, which is the maximum angle range, and then the photovoltaic frame 120 is supported by the upper support frame 222, so that the photovoltaic frame 120 is unfolded when in use, and is folded down with the stand 100 when not in use, i.e. it is not space-consuming when stored.

[0050] The upper end of the lower support frame 221 is connected with a support block 240 through a pin, the support block 240 is welded on the middle horizontal rod of the stand 100; the tail end of the servo cylinder 230 is connected with a support block 240 through a pin, the support block 240 is welded on the vertical rod of the stand 100 at the middle lower position; the outer end of the piston rod of the servo cylinder 230 is connected with a support block 240 through a pin, the support block 240 is welded on the lower end horizontal rod of the lower support frame 221; the upper and lower ends of the upper support frame 222 are connected with support blocks 240 through pins, the support block 240 at the upper end is welded on the middle horizontal rod of the photovoltaic frame 120, and the support block 240 at the lower end is welded on the lower end of the lower support frame 221, so that the turnover group 220 is unfolded under the driving of the servo cylinder 230, and the photovoltaic frame 120 is unfolded, so that the photovoltaic panel 210 receives light to generate current to test the real scene.

[0051] Specifically, as shown in Figures 4-7 The overcurrent test group 300 includes a fuse 310 connected in series with a row of photovoltaic panels 210, a current regulator 320, and a short circuit generator 330 connected in parallel to both ends of the current regulator 320; an oscilloscope 340 is arranged on the stand 100 and below each overcurrent test group 300, for monitoring the current and voltage of both ends of the photovoltaic panel 210 after short circuit; the photovoltaic panel 210, the fuse 310, and the current regulator 320 are connected in series, and the circuit is: photovoltaic panel positive electrode→fuse→current regulator→photovoltaic panel negative electrode.

[0052] The current regulator 320 is an electronic load, which is used to select different current values, set the electronic load to "constant current mode", gradually increase the load current to 1.5-2 times the rated value of the fuse 310, and trigger the fuse; ensure that the voltage and power of the electronic load match the maximum output of the photovoltaic panel, for example, a photovoltaic panel with Voc=50V, the load needs to support at least 60V;

[0053] The current regulator 320 is a variable resistance box, which adjusts the resistance value to change the loop current, gradually reduces the resistance value, so that the current exceeds the rated value of the fuse 310, and triggers the fuse; the resistance box needs to withstand a large current, such as more than 100A, and has good heat dissipation; the fuse 310, the current regulator 320, and the oscilloscope 340 are prior art, and will not be described here.

[0054] Specifically, the short circuit generator 330 includes two electrode terminals 331 arranged at a relative interval, a conductive rod 332 vertically inserted between the two electrode terminals 331, and a sector gear 333 for driving the conductive rod 332 up and down. The lower end of the conductive rod 332 is made of copper, and the electrode terminals 331 are made of copper in the form of a round shaft, so that the conductive rod 332 can conduct electricity smoothly after being in contact with the electrode terminals 331. The two electrode terminals 331 are connected to the two ends of the current regulator 320 through wires. The sector gear 333 is fixedly connected to the top surface of the photovoltaic frame 120. When the photovoltaic frame 120 is turned up to be horizontal, the sector gear 333 is deflected by 90 degrees, and at the same time, the conductive rod 332 is lowered to trigger a short circuit between the two electrode terminals 331, so that the fuse 310 fuses the circuit. That is, the personnel away from the remote control servo cylinder 230 drives the photovoltaic frame 120 to trigger the short circuit generator 330 to form a short circuit test, so that the personnel is away from the electric arc generated by the fuse 310 to ensure the safety of the personnel during the test. The oscilloscope 340 monitors the transient short circuit current captured by the photovoltaic panel 210 and verifies whether the voltage is zero. The current sharply rises to a peak value in a short time, and then rapidly decreases to zero. The voltage of the photovoltaic panel 210 returns to the open circuit voltage, and the fuse 310 successfully cuts off the circuit.

[0055] Further, the outer side of the upper half of the stand 100 is fixedly connected with a mounting plate 130, and the fuse 310, the current regulator 320 and the oscilloscope 340 are all mounted on the outer side of the mounting plate 130. The outer side of the mounting plate 130 and above the fuse 310 is fixedly connected with a guide seat 3312, and the outer side of the guide seat 3312 is symmetrically provided with two ring blocks. The electrode terminals 331 are slidably sleeved with the ring blocks, and the electrode terminals 331 are externally sleeved with springs 3311, and the two ends of the springs 3311 are fixedly connected to the ring blocks and the end faces of the electrode terminals 331, respectively. The two electrode terminals 331 are at the minimum interval through the elastic rebound of the springs 3311. When the conductive rod 332 is lowered and inserted between the two electrode terminals 331, a short circuit is triggered. The electrode terminals 331 are in stable contact with the conductive rod 332 through the elastic force of the springs 3311.

[0056] Further, the top inside of the conductive rod 332 is embedded with a rack 3321, the rack 3321 is engaged with the sector gear 333, and the center shaft of the sector gear 333 is arranged in coincidence with the rotating shaft of the photovoltaic frame 120. The top of the stand 100 and the mounting plate 130 and at the position of the sector gear 333 are provided with an opening, so as not to be interfered when the sector gear 333 is deflected.

[0057] Further, the top of the guide seat 3312 is fixedly connected with a guide sleeve 3322, and the guide sleeve 3322 is slidably sleeved with the conductive rod 332; so that the conductive rod 332 is guided to lift, thereby stably contacting with the pair of electrode terminals 331; the center shaft of the sector gear 333 is fixedly connected with a hanger 334 through a pin, and the hanger 334 is fixedly connected with the top surface of the photovoltaic frame 120. The above fixed connection is bolted connection or welding, which is all prior art and will not be described here.

[0058] The application also provides a test method for photovoltaic engineering protection equipment, using the test device for photovoltaic engineering protection equipment, comprising the following steps:

[0059] S1, connecting a plurality of fuses 310 to the circuit of the overcurrent test group 300, that is, connecting a row of photovoltaic panels 210, a plurality of fuses 310 and a current regulator 320 in series;

[0060] S2, connecting a short circuit generator 330 in parallel to both ends of the current regulator 320;

[0061] S3, starting the servo cylinder 230 to drive the overturning group 220 to drive the photovoltaic panel 210 to expand to 30-45 degrees to receive light to generate current;

[0062] S4, adjusting the current regulator 320 to gradually increase the load current until the fuse 310 is triggered to fuse, at which time the oscilloscope 340 records the fusing time and the fault current waveform, so as to perform overcurrent test;

[0063] Overcurrent test process

[0064] Initial setting: disconnect the oscilloscope 340, and only use the ammeter to adjust the electronic load to be close to the fusing threshold, such as 90% of the rated current;

[0065] Capture stage: connect the oscilloscope 340 and set the trigger condition, such as current > 110% rated value, continue to increase the load until fusing;

[0066] Data saving: save the waveform after fusing, disconnect the oscilloscope 340 for the next round of test preparation;

[0067] S5, after replacing the new fuse 310, continue to start the servo cylinder 230 to drive the overturning group 220 to drive the photovoltaic panel 210 to expand to the horizontal state, then trigger the conductive rod 332 to insert between the pair of electrode terminals 331, trigger the overcurrent test group 300 circuit to occur short circuit, record the breaking time of the fuse 310 and the short circuit current peak value, and verify whether the voltage is zero;

[0068] Short circuit test process

[0069] Whole connection: the oscilloscope 340 is always connected, the pre-trigger mode is set, and the waveform 10ms before triggering is recorded;

[0070] Single trigger: after closing the short circuit generator 330, the oscilloscope 340 automatically captures the transient current and stores the data;

[0071] Safety reset: after the fuse is disconnected, the short circuit generator 330 is checked, and the oscilloscope 340 data is prepared for the next test;

[0072] S6, after the test of steps S4 and S5, according to the recorded data, the fuse time of the fuse 310 and the current and voltage monitored by the oscilloscope 340 are in the compliance range, then it is judged that the batch of fuses 310 is qualified products.

[0073] It should be noted that the above embodiments only serve to illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A photovoltaic engineering protection equipment test apparatus comprising a stand in the form of an upright frame structure, characterised in that: The top of the stand is hinged with a photovoltaic frame, a photovoltaic panel group is arranged on the photovoltaic frame, one side of the top of the stand is provided with a plurality of overcurrent test groups; the photovoltaic panel group comprises a plurality of photovoltaic panels mounted on the photovoltaic frame, a turnover group mounted between the middle part of the stand and the photovoltaic frame, and a servo cylinder; the servo cylinder drives the turnover group to drive the photovoltaic frame to turn over and expand; the overcurrent test group comprises a fuse connected in series with a row of photovoltaic panels, a current regulator, and a short circuit generator connected in parallel to both ends of the current regulator; an oscilloscope is arranged below each overcurrent test group on the stand and is used for monitoring the current and voltage of both ends of the photovoltaic panel after short circuit; The short circuit generator comprises two electrode ends arranged in opposite positions, a conductive rod vertically inserted between the two electrode ends, and a sector gear for driving the conductive rod to rise and fall; the two electrode ends are connected to both ends of the current regulator through wires; the sector gear is fixedly connected to the top surface of the photovoltaic frame, when the photovoltaic frame is turned over to be horizontal, the sector gear is deflected by 90 degrees, at the same time, the conductive rod is lowered to trigger the short circuit between the two electrode ends, then the fuse is fused, the oscilloscope monitors the transient short circuit current captured by the photovoltaic panel, and verifies whether the voltage is zero.

2. The photovoltaic engineering protective equipment testing device of claim 1, wherein: The turnover group comprises a lower support frame rotatably connected to the middle part of the stand and an upper support frame rotatably connected between the outer end of the lower support frame and the middle part of the photovoltaic frame, the front end of the piston rod of the output end of the servo cylinder is rotatably connected to the outer end of the lower support frame, and the tail end of the servo cylinder is rotatably connected to the middle part of the stand.

3. The photovoltaic engineering protective equipment testing device of claim 2, wherein: The current regulator is an electronic load, which is used for selecting different current values, setting the electronic load to be in a "constant current mode", gradually increasing the load current to 1.5-2 times the rated value of the fuse, and triggering the fuse.

4. The photovoltaic engineering protective equipment testing device of claim 2, wherein: The current regulator is a variable resistance box, which is used for adjusting the resistance value to change the loop current, gradually reducing the resistance value, making the current exceed the rated value of the fuse, and triggering the fuse.

5. The photovoltaic engineering protective equipment testing device of claim 2, wherein: The outer side of the upper half of the stand is fixedly connected with a mounting plate, the fuse, the current regulator and the oscilloscope are all mounted on the outer side of the mounting plate; the outer side of the mounting plate and above the fuse are fixedly connected with a guide seat, two ring blocks are symmetrically arranged on the outer side of the guide seat, the electrode end is slidably sleeved with the ring block, and a spring is sleeved outside the electrode end, and both ends of the spring are fixedly connected with the ring block and the electrode end face respectively.

6. The photovoltaic engineering protective equipment testing device of claim 5, wherein: The top inside of the conductive rod is embedded with a rack, the rack is engaged with the sector gear, and the center axis of the sector gear is arranged in coincidence with the rotating shaft of the photovoltaic frame.

7. The photovoltaic engineering protective equipment testing device of claim 6, wherein: The top of the guide seat is fixedly connected with a guide sleeve, the guide sleeve is slidably sleeved with the conductive rod; the lower end of the conductive rod is made of copper material and is in the shape of a circular shaft.

8. The photovoltaic engineering protection equipment test device of claim 7, wherein: The center axis of the sector gear is fixedly connected with a hanger through a pin, and the hanger is fixedly connected with the top surface of the photovoltaic frame.

9. The photovoltaic engineering protective equipment testing device of claim 8, wherein: The bottom transverse pipe of the stand and on one side of the photovoltaic frame are inserted with an extension frame.

10. A test method for photovoltaic engineering protection equipment using the photovoltaic engineering protection equipment test device according to claim 9, characterized by, The method comprises the following steps: S1, connecting a plurality of fuses to the overcurrent test group circuit, that is, connecting a row of photovoltaic panels, a plurality of fuses and a current regulator in series; S2, connecting a short circuit generator in parallel to both ends of the current regulator; S3, starting the servo cylinder to drive the turnover group to drive the photovoltaic panel to expand to 30-45 degrees to receive light to generate current; S4, adjust the flow regulator to gradually increase the load current to the fuse trigger, at which time the oscilloscope records the fuse time and fault current waveform, so as to carry out overcurrent test; S5, after replacing the new fuse, continue to start the servo cylinder to drive the turnover group to drive the photovoltaic panel to expand to the horizontal state, then the conductive rod is inserted between a pair of electrode ends, the overcurrent test group circuit is triggered to occur short circuit, the fuse breaking time and short circuit current peak value are recorded, and whether the voltage is zero is verified; S6, after the test of steps S4 and S5, according to the recorded data, it is judged that the fuse breaking time and the current and voltage monitored by the oscilloscope are within the compliance range, then it is judged that the batch of fuses is qualified products.

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