Ground insulation resistance detection device

Abstract

The utility model provides a ground insulation resistance detection device, and relates to the technical field of resistance detection. The ground insulation resistance detection device comprises a detection seat and a detection mechanism, the detection mechanism comprises a grounding terminal arranged on the detection seat, a detection assembly and a conversion assembly, the detection assembly is used for detecting a voltage value and a current value of one of a positive pole direct current bus and a negative pole direct current bus, and the conversion assembly is configured to convert the voltage value and the current value of the other one of the positive pole direct current bus and the negative pole direct current bus. When the first detection piece and the second detection piece are electrically connected with the positive direct-current bus line and the negative direct-current bus line respectively, a voltage value and a current value are converted into a ground insulation resistance value, and a power supply of detected equipment is used as a power supply for detecting the current value and the voltage value of the positive direct-current bus line and the negative direct-current bus line. The ground insulation resistance of the direct current bus in a power-on state can be detected rapidly.

Description

Technical Field

[0001] The present application relates to resistance detection technology, and in particular to a ground insulation resistance detection device. Background Art

[0002] In power systems, DC busbars are crucial transmission lines. However, due to long-term use and environmental factors, the insulation layer of DC busbars may age or break, resulting in reduced insulation resistance to ground, which can lead to safety accidents.

[0003] The existing technology uses a megohmmeter to detect the insulation resistance of a DC bus line to ground. During the measurement process, the DC bus line should first be disconnected from the power supply. After connecting the megohmmeter to the DC bus line, the handle on the megohmmeter is turned to charge the DC bus line and detect its insulation resistance to ground.

[0004] However, in some application scenarios, power outages may cause the working efficiency of the DC bus to decrease. At the same time, it is inconvenient to operate a megohmmeter to detect the insulation resistance to ground. Utility Model Content

[0005] In view of this, the present application provides a device for detecting insulation resistance to ground, which can relatively quickly detect the insulation resistance to ground of a DC bus in a powered state.

[0006] To achieve the above objectives, the present application provides a ground insulation resistance detection device, which adopts the following technical solutions:

[0007] The present application provides a ground insulation resistance detection device for detecting the ground insulation resistance value of a device under test, wherein the device under test includes: a power supply, a positive DC bus line, and a negative DC bus line, wherein the positive DC bus line and the negative DC bus line are electrically connected to two ends of the power supply, respectively, and the insulation layer of the positive DC bus line and the insulation layer of the negative DC bus line are both grounded;

[0008] The ground insulation resistance detection device includes: a detection seat and a detection mechanism;

[0009] The detection mechanism includes a ground terminal, a detection component and a conversion component arranged on the detection seat;

[0010] The detection assembly includes a first detection member and a second detection member, wherein the first detection member and the second detection member are both electrically connected to the ground terminal, and the first detection member and the second detection member are both electrically connected to the conversion assembly;

[0011] The first detection member is used to electrically connect to one of the positive DC bus line and the negative DC bus line, and the second detection member is used to electrically connect to the other of the positive DC bus line and the negative DC bus line;

[0012] The first detection member and the second detection member are used to respectively detect the voltage value and the current value of one of the positive DC bus line and the negative DC bus line;

[0013] The grounding terminal is used for grounding, and the detection component is electrically connected to the grounding terminal;

[0014] The conversion component is electrically connected to the detection component, and the conversion component is configured to convert the voltage value and the current value into an insulation resistance value to ground when the first detection component and the second detection component are electrically connected to the positive DC bus and the negative DC bus respectively.

[0015] In a possible implementation, in the ground insulation resistance detection device provided by the present application, one of the first detection component and the second detection component is used to detect the voltage value, and the other of the first detection component and the second detection component is used to detect the current value.

[0016] In a possible implementation, the ground insulation resistance detection device provided by the present application, wherein the first detection component is used to detect the current value, and the first detection component includes a first connecting component, a first acquiring component, and at least one current limiting resistor;

[0017] The first connector is provided on the detection seat, and the first connector is used to be electrically connected to one of the positive DC bus line and the negative DC bus line;

[0018] The first connecting member, at least one current-limiting resistor, the first acquiring member and the ground terminal are electrically connected in sequence;

[0019] The first acquisition member is electrically connected to the conversion component, and is configured to acquire the current value and input the current value into the conversion component when the first connection member is electrically connected to one of the positive DC bus line and the negative DC bus line.

[0020] In a possible implementation, in the ground insulation resistance detection device provided by the present application, the first connecting member is provided at an end portion in an extension direction of the detection base.

[0021] In a possible implementation, the ground insulation resistance detection device provided by the present application further includes at least one first safety component;

[0022] At least one first fuse is electrically connected between the first connection member and the current-limiting resistor.

[0023] In a possible implementation, the ground insulation resistance detection device provided by the present application, wherein the second detection component is used to detect the voltage value, and the second detection component includes a second connecting component, a second acquiring component, and at least one voltage dividing resistor;

[0024] The second connecting member is provided on the detection seat, and the second connecting member is used to be electrically connected to one of the positive DC bus line and the negative DC bus line;

[0025] The second connecting member, at least one of the voltage dividing resistors and the ground terminal are electrically connected in sequence;

[0026] The second acquisition component is electrically connected to one of the voltage dividing resistors;

[0027] The second acquisition member is electrically connected to the conversion component, and the second acquisition member is configured to obtain the voltage value and input the voltage value into the conversion component when the second connection member is electrically connected to one of the positive DC bus line and the negative DC bus line.

[0028] In a possible implementation, in the ground insulation resistance detection device provided by the present application, the second connecting member is provided on a side wall of the detection base.

[0029] In a possible implementation, the ground insulation resistance detection device provided by the present application further includes at least one second safety component;

[0030] At least one second fuse is connected between the second connector and the voltage-dividing resistor.

[0031] In a possible implementation, the ground insulation resistance detection device provided by the present application, the conversion component includes a conversion component and a display component;

[0032] The conversion member is electrically connected to the detection component, and the conversion member is electrically connected to the display member;

[0033] The conversion element is configured to convert the voltage value and the current value into the insulation resistance value to the ground, and display the insulation resistance value to the ground on the display element.

[0034] In a possible implementation, the ground insulation resistance detection device provided by the present application has an installation cavity in the detection base, and the conversion component and part of the detection component are arranged in the installation cavity.

[0035] The present application provides a device for detecting insulation resistance to ground, by setting a detection seat and a detection mechanism, the detection mechanism including a grounding terminal, a detection component and a conversion component arranged on the detection seat, the detection component being used to respectively detect the voltage value and current value of one of the positive DC bus and the negative DC bus, the conversion component being electrically connected to the detection component, the conversion component being configured to convert the voltage value and current value into insulation resistance value to ground when the first detection member and the second detection member are respectively electrically connected to the positive DC bus and the negative DC bus, and utilizing the power supply of the device under test itself as the power supply for detecting the current value and voltage value of the positive DC bus and the negative DC bus, without the need to power off the device under test, thereby reducing the impact on the working efficiency of the device under test, and compared with the traditional operation of operating a megohmmeter to generate electricity to detect insulation resistance value to ground, the device has higher convenience and can more quickly detect the insulation resistance to ground of the DC bus in the energized state.

[0036] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the technical solutions provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to illustrate and explain the present application, and the present application is not limited to the specific implementation methods described below.

[0038] Figure 1 A schematic structural diagram of a ground insulation resistance detection device provided in an embodiment of the present application;

[0039] Figure 2 for Figure 1 A schematic diagram of the structure of the ground insulation resistance detection device in the embodiment of the present invention when detecting the insulation resistance value of the positive DC bus line to the ground.

[0040] Description of reference numerals:

[0041] 100, device under test; 110, power supply; 120, positive DC bus line; 130, negative DC bus line;

[0042] 200, detection seat;

[0043] 300, ground terminal;

[0044] 400, detection component; 410, first detection component; 411, first connecting component; 412, first acquisition component; 413, current limiting resistor; 414, first safety component; 420, second detection component; 421, second connecting component; 422, second acquisition component; 423, voltage divider resistor; 424, second safety component;

[0045] 500, conversion assembly; 510, conversion part; 520, display part; 600, umbrella-shaped handle; 700, protective shell.

[0046] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0050] In the description of the present application, “plurality” means two or more than two, unless otherwise specifically and precisely defined.

[0051] The terms "first", "second", "third", "fourth", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0052] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0053] In a PV power plant, to reduce the number of cables connecting PV modules and inverters, PV modules of the same power rating are connected in series to form a PV string. Multiple PV strings are then connected in parallel to a PV DC combiner box. After passing through a fuse, DC power is output via a dedicated PV DC circuit breaker and connected to a DC distribution cabinet and PV inverter. This power is then converted to AC power for grid-connected power generation.

[0054] DC busbars are a crucial transmission line. However, due to long-term use and environmental factors, the insulation layer of DC busbars may age or break, resulting in reduced insulation resistance to ground. High-power currents can flow through these areas of insulation, potentially causing safety incidents.

[0055] Before or during the operation of the PV string, a megohmmeter is used to test the insulation resistance of the DC bus to ground. During the measurement process, the DC bus should first be disconnected from the power supply, that is, the PV string should stop transmitting power to the DC bus. After connecting the megohmmeter to the DC bus, turn the handle on the megohmmeter to charge the DC bus and test its insulation resistance to ground.

[0056] However, a power outage in the photovoltaic string means a waste of the photovoltaic power generated by the photovoltaic string, causing the DC bus to be unable to transmit the photovoltaic power generated by the photovoltaic string, resulting in a decrease in the working efficiency of the DC bus. In other words, each time the insulation resistance value to ground of the DC bus of the photovoltaic string is tested, the photovoltaic string needs to be stopped, which greatly affects the working efficiency of the photovoltaic string and the DC bus. At the same time, it is inconvenient to operate the megohmmeter to test the insulation resistance to ground. First, the handle of the megohmmeter needs to be manually turned to generate electricity, and the corresponding measurement can only be performed after the power generation is stable. Second, the detection process is time-consuming, further affecting the working efficiency of the photovoltaic string and the DC bus.

[0057] Based on the above technical problems, an embodiment of the present application provides a ground insulation resistance detection device. In this technical solution, a detection seat and a detection mechanism are set, and the detection mechanism includes a ground terminal, a detection component and a conversion component set on the detection seat. The detection component is used to respectively detect the voltage value and current value of one of the positive DC bus and the negative DC bus. The conversion component is electrically connected to the detection component. The conversion component is configured to convert the voltage value and current value into the ground insulation resistance value when the first detection component and the second detection component are respectively electrically connected to the positive DC bus and the negative DC bus. The power supply of the device under test itself is used as the power supply for detecting the current value and voltage value of the positive DC bus and the negative DC bus, that is, the DC power generated by the photovoltaic string is used as the power supply for detecting the current value and voltage value of the positive DC bus and the negative DC bus. There is no need to power off the photovoltaic string, which reduces the impact on the working efficiency of the photovoltaic string and the DC bus. Compared with the traditional operation of the megohmmeter to generate electricity to detect the ground insulation resistance value, it is more convenient and can quickly detect the ground insulation resistance of the DC bus in the energized state.

[0058] It should be noted that Figure 1 and Figure 2 The schematic diagram of each component in the ground insulation resistance detection device is shown. The specific structure of the remaining components in the ground insulation resistance detection device is not limited to Figure 1 and Figure 2 of examples.

[0059] The present application is described in detail below with reference to the accompanying drawings and specific embodiments:

[0060] Reference Figure 1 and Figure 2 As shown, an embodiment of the present application provides an insulation resistance detection device to ground, which is used to detect the insulation resistance value of a device under test 100 to ground. The device under test 100 includes: a power supply 110, a positive DC bus 120 and a negative DC bus 130. The positive DC bus 120 and the negative DC bus 130 are electrically connected to both ends of the power supply 110, and the insulation layer of the positive DC bus 120 and the insulation layer of the negative DC bus 130 are both grounded.

[0061] It should be explained here that the device under test 100 can be any device in the relevant field. Figure 2As shown, the device under test 100 is a photovoltaic string, and multiple photovoltaic panels are connected in series and parallel to form a power supply 110. The specific structure of the power supply 110 is not limited here. The insulation layer of the positive DC bus 120 and the insulation layer of the negative DC bus 130 are both grounded, which is equivalent to the insulation layer of the positive DC bus 120 and the insulation layer of the negative DC bus 130 being damaged or broken and contacting the ground, forming a closed circuit with the ground, resulting in a decrease in the equivalent insulation resistance value of the insulation layer of the positive DC bus 120 and the insulation layer of the negative DC bus 130.

[0062] The ground insulation resistance detection device includes a detection base 200 and a detection mechanism.

[0063] The detection mechanism includes a ground terminal 300 , a detection component 400 , and a conversion component 500 , which are arranged on a detection base 200 .

[0064] The detection assembly 400 includes a first detection member 410 and a second detection member 420 . The first detection member 410 and the second detection member 420 are both electrically connected to the ground terminal 300 . The first detection member 410 and the second detection member 420 are both electrically connected to the conversion assembly 500 .

[0065] The first detection element 410 is used to electrically connect to one of the positive DC bus line 120 and the negative DC bus line 130 , and the second detection element 420 is used to electrically connect to the other of the positive DC bus line 120 and the negative DC bus line 130 .

[0066] Here, when first detection element 410 is electrically connected to one of positive DC bus line 120 and negative DC bus line 130, it is connected to the insulation layer of positive DC bus line 120 and the insulation layer of negative DC bus line 130 to detect the equivalent insulation resistance to ground of the insulation layer of positive DC bus line 120 and the insulation layer of negative DC bus line 130. This connection method is related technology in this field and is not further described here.

[0067] The first detection element 410 and the second detection element 420 are used to respectively detect the voltage value and the current value of one of the positive DC bus line 120 and the negative DC bus line 130 .

[0068] The ground terminal 300 is used for grounding, and the detection component 400 is electrically connected to the ground terminal 300 .

[0069] The conversion component 500 is electrically connected to the detection component 400. The conversion component 500 is configured to convert the voltage value and the current value into the insulation resistance value to the ground when the first detection component 410 and the second detection component 420 are electrically connected to the positive DC bus 120 and the negative DC bus 130 respectively.

[0070] In the above embodiment, the photovoltaic string and the positive DC bus 120 and the negative DC bus 130 are all in a powered-on state, and the power supply 110 of the device under test 100 itself is used as the power supply 110 for detecting the current value and voltage value of the positive DC bus 120 and the negative DC bus 130. That is, the DC power generated by the photovoltaic string is used as the power supply 110 for detecting the current value and voltage value of the positive DC bus 120 and the negative DC bus 130. There is no need to power off the photovoltaic string, thereby reducing the impact on the working efficiency of the photovoltaic string and the DC bus. Compared with the traditional operation of operating a megohmmeter to generate electricity to detect the insulation resistance value to the ground, it is more convenient and can more quickly detect the insulation resistance to the ground of the DC bus in the powered-on state.

[0071] In a possible implementation, one of the first detection element 410 and the second detection element 420 is used to detect a voltage value, and the other of the first detection element 410 and the second detection element 420 is used to detect a current value.

[0072] Specifically, the first detection member 410 is used to detect the current value. Of course, the second detection member 420 can also be used to detect the current value. Here, only one possible implementation method is shown. Figure 1 and Figure 2 As shown, the first detecting element 410 includes a first connecting element 411 , a first acquiring element 412 and at least one current limiting resistor 413 .

[0073] The first connector 411 is disposed on the detection base 200 , and is used to electrically connect to one of the positive DC bus line 120 and the negative DC bus line 130 .

[0074] The first connecting member 411 , at least one current-limiting resistor 413 , the first acquiring member 412 and the ground terminal 300 are electrically connected in sequence.

[0075] The first acquisition member 412 is electrically connected to the conversion assembly 500 . The first acquisition member 412 is configured to acquire a current value and input the current value into the conversion assembly 500 when the first connection member 411 is electrically connected to one of the positive DC bus 120 and the negative DC bus 130 .

[0076] In the above embodiment, the first acquisition member 412 can directly acquire the current flowing between the first connection member 411 and the ground terminal 300. Here, the current flowing between the first connection member 411 and the ground terminal 300 is marked as I1, the equivalent resistance in the first detection member 410 is marked as R1, and the current value in one of the positive DC bus line 120 and the negative DC bus line 130 is marked as I 汇 The equivalent resistance of one of the positive DC bus line 120 and the negative DC bus line 130 electrically connected to the first connector 411 is marked as R 汇1, through formula I 汇 =I1 R1 / R 汇 , the current value of one of the positive DC bus line 120 and the negative DC bus line 130 can be obtained.

[0077] During the specific operation, the operator can move the detection seat 200, and the detection seat 200 drives the first connecting member 411 to be electrically connected to one of the positive DC bus 120 and the negative DC bus 130, and the current value of the other one of the positive DC bus 120 and the negative DC bus 130 can be immediately obtained. It can be understood here that, for example, when the first connecting member 411 is electrically connected to the negative DC bus 130, the value of R1 in the first detection member 410 is much smaller than the R value of the negative DC bus 130. 汇 , the current will flow from the first detection element 410 to the negative electrode of the power supply 110, and this current is the ground leakage current of the positive DC bus 120, that is, I 汇 .

[0078] In a possible implementation, the first connecting member 411 is disposed at an end portion of the detection base 200 in an extending direction.

[0079] In the above embodiment, the first connector 411 is disposed at the end portion of the detection base 200 in the extension direction, so that the first connector 411 can be more conveniently connected to the other one of the positive DC bus 120 and the negative DC bus 130 , thereby improving detection efficiency.

[0080] In a possible implementation manner, at least one first securing member 414 is further included.

[0081] At least one first fuse 414 is electrically connected between the first connector 411 and the current-limiting resistor 413 .

[0082] In the above embodiment, the first safety component 414 is a current circuit overcurrent fuse. The first safety component 414 can improve the safety of the first detection component 410 and avoid the insulation between the poles of the first detection component 410 from being broken down and forming a discharge channel due to excessive current value during detection, causing damage to personnel and equipment.

[0083] Furthermore, current-limiting resistor 413 is a PTC thermistor, a nonlinear resistor. Its resistance is 50 kΩ, and there are at least two current-limiting resistors 413 connected in series. Operating at a current of 50 mA, they assume a low-resistance state. When the current exceeds 50 mA, they assume a high-resistance state, capable of withstanding a DC voltage of 1500 V without breakdown, further enhancing the safety of first detection element 410.

[0084] In a possible implementation, the second detecting element 420 is used to detect a voltage value. The second detecting element 420 includes a second connecting element 421 , a second acquiring element 422 , and at least one voltage dividing resistor 423 .

[0085] The second connector 421 is disposed on the detection base 200 , and is used to electrically connect to one of the positive DC bus line 120 and the negative DC bus line 130 .

[0086] The second connecting member 421 , the at least one voltage-dividing resistor 423 and the ground terminal 300 are electrically connected in sequence.

[0087] The second acquisition element 422 is electrically connected to one of the voltage-dividing resistors 423 .

[0088] The second acquisition member 422 is electrically connected to the conversion assembly 500 , and is configured to acquire a voltage value when the second connection member 421 is electrically connected to one of the positive DC bus 120 and the negative DC bus 130 , and input the voltage value into the conversion assembly 500 .

[0089] In the above embodiment, the second acquisition component 422 can obtain the voltage of one of the voltage-dividing resistors 423. Here, the voltage across one of the voltage-dividing resistors 423 is marked as U2, the equivalent resistance in the second detection component 420 is marked as R2, and the voltage value in one of the positive DC bus line 120 and the negative DC bus line 130 is marked as U. 汇 The equivalent resistance of one of the positive DC bus line 120 and the negative DC bus line 130 electrically connected to the second connector 421 is marked as R 汇2 , through the formula U 汇 =U2R 汇2 / R2, the voltage value of one of the positive DC bus line 120 and the negative DC bus line 130 can be obtained.

[0090] At this time, the insulation resistance value R of one of the positive DC bus line 120 and the negative DC bus line 130 to the ground is 地 =U 汇 / I 汇 .

[0091] In one possible embodiment, the second connector 421 is disposed on a side wall of the detection base 200. In this way, the first connector 411 and the second connector 421 do not interfere with each other when electrically connecting the positive DC bus 120 and the negative DC bus 130, respectively, thereby improving operational portability.

[0092] In a possible implementation manner, at least one second securing member 424 is further included.

[0093] At least one second fuse 424 is connected between the second connector 421 and the voltage-dividing resistor 423 .

[0094] The second safety element 424 can be a current fuse with a working current of 500mA and a breaking voltage of DC1500V, and is connected in series with the voltage divider resistor 423. It plays the role of protecting the second detection element 420 from the fault current when the circuit fault is in a low-resistance state, thereby improving the safety of the second detection element 420.

[0095] Furthermore, the voltage-dividing resistor 423 is a 10 GΩ resistor, and the number of the voltage-dividing resistors 423 is set to be at least 5. The 5 voltage-dividing resistors 423 are connected in series, which further protects the second detection element 420 .

[0096] In one possible implementation, the conversion assembly 500 includes a conversion component 510 and a display component 520 .

[0097] The conversion element 510 is electrically connected to the detection component 400 , and the conversion element 510 is electrically connected to the display element 520 .

[0098] The conversion element 510 is configured to convert the voltage value and the current value into the insulation resistance value to the ground, and display the insulation resistance value to the ground on the display element 520. In the related art, the conversion element 510 has a calculation function and can be a single chip computing unit. 地 =U 汇 / I 汇 The insulation resistance value of one of the positive DC bus line 120 and the negative DC bus line 130 to the ground is calculated, and the insulation resistance value R 地 Displayed on the display element 520, wherein the display element 520 can be a display screen, or a numerical value broadcasting device. 地 By sound broadcast, only the display unit 520 can enable the operator to obtain R 地 That is, this application does not limit the specific structure of the display element.

[0099] In a possible embodiment, the display element 520 has an alarm reminder device. 地 When the insulation resistance value to ground does not match the preset value, an alarm message will be issued to remind the operator to repair the tested equipment in time.

[0100] Furthermore, the conversion element 510 may be a single-chip computing unit with a built-in battery, and the battery can provide the power required for the conversion element 510 and the display element 520 to work.

[0101] Furthermore, in a possible embodiment, the detection base 200 has a mounting cavity therein, and the conversion component 500 and part of the detection component 400 are disposed in the mounting cavity.

[0102] In the above embodiment, the conversion component 500 and part of the detection component 400 are arranged in the installation cavity, which can protect the safety of the conversion component 500 and part of the detection component 400, avoid accidental bumps, and extend the service life of the conversion component 500 and part of the detection component 400.

[0103] Further, refer to Figure 1 As shown, the detection base 200 is rod-shaped, and has an umbrella-shaped handle 600 at one end of the detection base 200 away from the first connecting member 411. The umbrella-shaped handle 600 can protect the safety of the operator.

[0104] In order to further protect the safety of the operator, the detection base 200 is made of epoxy resin, which can insulate the detection base 200 and prevent the operator from accidentally getting an electric shock.

[0105] Reference Figure 1 As shown, a protective shell 700 is further provided on the detection base 200, and the protective shell 700 is threadedly connected to the umbrella-shaped handle 600. The protective shell 700 can further protect the safety of some components in the ground insulation resistance detection device.

[0106] The implementation principle of the ground insulation resistance detection device of the embodiment of the present application is as follows: by setting a detection seat 200 and a detection mechanism, the detection mechanism includes a ground terminal 300, a detection component 400 and a conversion component 500 arranged on the detection seat 200, the detection component 400 is used to respectively detect the voltage value and current value of one of the positive DC bus 120 and the negative DC bus 130, the conversion component 500 is electrically connected to the detection component 400, and the conversion component 500 is configured to convert the voltage value and current value of one of the positive DC bus 120 and the negative DC bus 130 into a positive voltage value and a negative current value when the first detection component 410 and the second detection component 420 are respectively electrically connected to the positive DC bus 120 and the negative DC bus 130. The value is converted into an insulation resistance value to ground, and the power supply 110 of the device under test 100 is used as the power supply 110 when detecting the current value and voltage value of the positive DC bus 120 and the negative DC bus 130. That is, the DC power generated by the photovoltaic string is used as the power supply 110 when detecting the current value and voltage value of the positive DC bus 120 and the negative DC bus 130. There is no need to power off the photovoltaic string, thereby reducing the impact on the working efficiency of the photovoltaic string and the DC bus. Compared with the traditional operation of operating a megohmmeter to generate electricity to detect the insulation resistance value to ground, it is more convenient and can more quickly detect the insulation resistance to ground of the DC bus in the energized state.

[0107] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein.

[0108] This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of this application being indicated by the claims.

[0109] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A device for detecting insulation resistance to ground, for detecting the insulation resistance value of a device under test, wherein the device under test comprises: A power supply, a positive DC bus line, and a negative DC bus line, wherein the positive DC bus line and the negative DC bus line are electrically connected to both ends of the power supply, and the insulation layer of the positive DC bus line and the insulation layer of the negative DC bus line are both grounded. The device for detecting the insulation resistance to ground comprises: a detection seat and a detection mechanism; The detection mechanism includes a ground terminal, a detection component and a conversion component arranged on the detection seat; The detection assembly includes a first detection member and a second detection member, wherein the first detection member and the second detection member are both electrically connected to the ground terminal, and the first detection member and the second detection member are both electrically connected to the conversion assembly; The first detection member is used to electrically connect to one of the positive DC bus line and the negative DC bus line, and the second detection member is used to electrically connect to the other of the positive DC bus line and the negative DC bus line; The first detection member and the second detection member are used to respectively detect the voltage value and the current value of one of the positive DC bus line and the negative DC bus line; The grounding terminal is used for grounding, and the detection component is electrically connected to the grounding terminal; The conversion component is electrically connected to the detection component, and the conversion component is configured to convert the voltage value and the current value into an insulation resistance value to ground when the first detection component and the second detection component are electrically connected to the positive DC bus and the negative DC bus respectively.

2. The ground insulation resistance detection device according to claim 1, characterized in that: One of the first detecting member and the second detecting member is used to detect the voltage value, and the other of the first detecting member and the second detecting member is used to detect the current value.

3. The ground insulation resistance detection device according to claim 2, characterized in that: The first detecting element is used to detect the current value, and the first detecting element includes a first connecting element, a first acquiring element and at least one current limiting resistor; The first connector is provided on the detection seat, and the first connector is used to be electrically connected to one of the positive DC bus line and the negative DC bus line; The first connecting member, at least one current-limiting resistor, the first acquiring member and the ground terminal are electrically connected in sequence; The first acquisition member is electrically connected to the conversion component, and is configured to acquire the current value and input the current value into the conversion component when the first connection member is electrically connected to one of the positive DC bus line and the negative DC bus line.

4. The ground insulation resistance detection device according to claim 3, characterized in that: The first connecting member is arranged at an end portion of the detection seat in an extending direction.

5. The ground insulation resistance detection device according to claim 3, characterized in that: Also includes at least one first safety member; At least one first fuse is electrically connected between the first connection member and the current-limiting resistor.

6. The ground insulation resistance detection device according to claim 2, characterized in that: The second detecting element is used to detect the voltage value, and the second detecting element includes a second connecting element, a second acquiring element and at least one voltage dividing resistor; The second connecting member is provided on the detection seat, and the second connecting member is used to be electrically connected to one of the positive DC bus line and the negative DC bus line; The second connecting member, at least one of the voltage dividing resistors and the ground terminal are electrically connected in sequence; The second acquisition component is electrically connected to one of the voltage dividing resistors; The second acquisition member is electrically connected to the conversion component, and the second acquisition member is configured to obtain the voltage value and input the voltage value into the conversion component when the second connection member is electrically connected to one of the positive DC bus line and the negative DC bus line.

7. The ground insulation resistance detection device according to claim 6, characterized in that: The second connecting member is arranged on a side wall of the detection seat.

8. The ground insulation resistance detection device according to claim 6, characterized in that: Also includes at least one second safety member; At least one second fuse is connected between the second connector and the voltage-dividing resistor.

9. The ground insulation resistance detection device according to any one of claims 1 to 8, characterized in that: The conversion assembly includes a conversion part and a display part; The conversion member is electrically connected to the detection component, and the conversion member is electrically connected to the display member; The conversion element is configured to convert the voltage value and the current value into the insulation resistance value to the ground, and display the insulation resistance value to the ground on the display element.

10. The ground insulation resistance detection device according to any one of claims 1 to 8, characterized in that: The detection seat has an installation cavity, and the conversion component and part of the detection component are arranged in the installation cavity.

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