Direct-current branch insulation position searching and detecting device

Abstract

The utility model relates to the technical field of direct-current circuit detection, in particular to a direct-current branch insulation position searching and detecting device, which solves the technical problem that a more convenient and rapid detection device is not provided for direct-current branch detection of a component part of a control panel of a power distribution system in the prior art, and specifically comprises a first detection end and a second detection end, the first resistor assembly, the second resistor assembly and the third resistor assembly are connected in parallel between the first detection end and the second detection end; the first resistor assembly is connected with a grounding protection end. A first relay switch is arranged between the first resistor assembly and the second resistor assembly; a second relay switch is arranged between the second resistor assembly and the third resistor assembly; wherein the first resistor assembly comprises a winding resistor Rx and a voltage-sensitive resistor which are connected in series. According to the configuration of the technical scheme, the method has the advantages that rapid single-end insulation fault detection can be realized, and the actual detection deviation is small.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current circuit detection, in particular to a direct current branch circuit insulation position finding and detection device. Background Art

[0002] In the prior art, the DC branch detection of the control board components of the distribution system is generally carried out periodically. However, such periodic maintenance detection requires preliminary preparation, such as the disassembly of some hardware equipment. Therefore, the current method does not provide a more convenient rapid detection device. Utility Model Content

[0003] The utility model aims to solve the technical problem that a more convenient and rapid detection device is not provided for DC branch detection of a control board component part of a power distribution system in the prior art, and provides a DC branch insulation position detection device.

[0004] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0005] A device for finding and detecting the insulation position of a DC branch circuit, comprising:

[0006] A first detection end 100 and a second detection end 200;

[0007] The first resistance component, the second resistance component and the third resistance component are connected in parallel between the first detection terminal 100 and the second detection terminal 200;

[0008] The first resistor component is connected to a ground protection terminal PE1;

[0009] A first relay switch K1 is provided between the first resistor component and the second resistor component;

[0010] A second relay switch K2 is provided between the second resistor component and the third resistor component;

[0011] The first resistor component includes a winding resistor Rx and a varistor Ry connected in series.

[0012] Specifically, the winding resistor Rx is connected to the first detection end 100 , and the varistor Ry is connected to the second detection end 200 .

[0013] Specifically, the second resistance component includes:

[0014] A first resistor R1 , a third resistor R3 , a fourth resistor R4 , and a second resistor R2 are sequentially connected in series from the first detection end 100 to the second detection end 200 .

[0015] Specifically, the resistance values ​​of the second resistor R2 and the first resistor R1 are equal;

[0016] The resistance values ​​of the third resistor R3 and the fourth resistor R4 are equal.

[0017] Specifically, the third resistor component includes:

[0018] A seventh resistor R7 and an eighth resistor R8 connected in series from the first detection end 100 to the second detection end 200;

[0019] The resistance value of the eighth resistor R8 is four times the resistance value of the seventh resistor R7.

[0020] Specifically, the first relay switch K1 and the second relay switch K2 enable the winding resistor Rx, the first resistor R1, the third resistor R3 and the seventh resistor R7 to be connected in parallel, and the varistor Ry, the fourth resistor R4, the second resistor R2 and the eighth resistor R8 to be connected in parallel.

[0021] Specifically, the value range of the second resistor R2 is 1.0 to 1.2 MΩ.

[0022] Specifically, the value range of the resistor R8 is 900k to 1000kΩ.

[0023] The utility model has the following beneficial effects:

[0024] The advantage of the configuration of this technical solution is that it can realize rapid single-end detection of insulation faults, and the actual detection deviation is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Figure 1 A schematic diagram of the configuration of the DC branch insulation position detection device of the utility model;

[0027] The reference numerals in the figures indicate:

[0028] The first detection terminal 100, the second detection terminal 200, the winding resistor Rx, the varistor Ry, the first relay switch K1, the second relay switch K2, the first resistor R1, the third resistor R3, the fourth resistor R4, the second resistor R2, the seventh resistor R7, and the eighth resistor R8. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model; it should be noted that in this application, for the convenience of description, the "left side" in the current view is the "first end", the "right side" is the "second end", the "upper side" is the "first end", and the "lower side" is the "second end". The purpose of such description is to clearly express the technical solution, and it should not be understood as an improper limitation on the technical solution of this application.

[0030] In a specific embodiment, see Figure 1 As shown, a DC branch insulation position detection device includes:

[0031] A first detection end 100 and a second detection end 200;

[0032] The second detection end 200 is formed with a first detection position 1 and a second detection position 2;

[0033] The first resistance component, the second resistance component, and the third resistance component are connected in parallel between the first detection terminal 100 and the second detection terminal 200;

[0034] The first resistor component is connected to a ground protection terminal PE1;

[0035] A first relay switch K1 is provided between the first resistor component and the second resistor component;

[0036] A second relay switch K2 is provided between the second resistor component and the third resistor component;

[0037] The first resistor component includes a winding resistor Rx and a varistor Ry connected in series.

[0038] In a specific embodiment, see Figure 1 As shown, the winding resistor Rx is connected to the first detection terminal 100 , and the varistor Ry is connected to the second detection terminal 200 .

[0039] In a specific embodiment, see Figure 1 As shown, the second resistance component includes:

[0040] A first resistor R1 , a third resistor R3 , a fourth resistor R4 , and a second resistor R2 are sequentially connected in series from the first detection end 100 to the second detection end 200 .

[0041] In a specific embodiment, see Figure 1As shown, the resistance values ​​of the second resistor R2 and the first resistor R1 are equal;

[0042] The resistance values ​​of the third resistor R3 and the fourth resistor R4 are equal.

[0043] In a specific embodiment, see Figure 1 As shown, the third resistor component includes:

[0044] A seventh resistor R7 and an eighth resistor R8 connected in series from the first detection terminal 100 to the second detection terminal 200;

[0045] The resistance value of the eighth resistor R8 is four times the resistance value of the seventh resistor R7.

[0046] In a specific embodiment, see Figure 1 As shown, the first relay switch K1 and the second relay switch K2 make the winding resistor Rx, the first resistor R1, the third resistor R3 and the seventh resistor R7 connected in parallel, and the varistor Ry, the fourth resistor R4, the second resistor R2 and the eighth resistor R8 connected in parallel.

[0047] In a specific embodiment, see Figure 1 As shown, the value range of resistor No. 2 R2 is 1.0~1.2MΩ.

[0048] In a specific embodiment, see Figure 1 As shown, the value range of resistor R8 is 900k~1000kΩ.

[0049] In this technical solution, its core principle is based on the unbalanced bridge model, the first detection terminal 100 corresponds to DC+, the second detection terminal corresponds to DC-, wherein the winding resistor Rx is equivalent to the equivalent resistance corresponding to the DC+ to be measured and the ground protection terminal PE1; similarly, the varistor Ry corresponds to the equivalent resistance of DC- and the ground protection terminal PE1; the third resistor R3 and the fourth resistor R4 are voltage sampling resistors, and the working principle is:

[0050] The DC branch insulation position detection device is embodied in the form of a circuit configuration. When the device is not working, the first relay switch K1 and the second relay switch K2 are disconnected to avoid the influence of the DC detection machine components.

[0051] When in use, when the first relay switch K1 is closed, a voltage is sampled once to obtain a first voltage;

[0052] Then the second relay switch K2 is closed, and the first relay switch K1 remains closed. The voltage is sampled again to obtain the second voltage, and the winding resistance Rx and the varistor Ry can be calculated.

[0053] Therefore, the advantage of the configuration of the present technical solution is that it can realize rapid single-ended detection of insulation faults with small deviation in actual detection.

[0054] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A device for finding and detecting the insulation position of a DC branch circuit, characterized in that: include: A first detection end (100) and a second detection end (200); A first resistance component, a second resistance component, and a third resistance component are connected in parallel between the first detection end (100) and the second detection end (200); The first resistor component is connected to a ground protection terminal (PE1); A first relay switch (K1) is provided between the first resistance component and the second resistance component; A second relay switch (K2) is provided between the second resistor component and the third resistor component; The first resistor component includes a wire-wound resistor (Rx) and a varistor (Ry) connected in series.

2. The DC branch insulation position detection device according to claim 1, characterized in that: The winding resistor (Rx) is connected to the first detection end (100), and the varistor (Ry) is connected to the second detection end (200).

3. The DC branch insulation position detection device according to claim 2, characterized in that: The second resistance component comprises: A first resistor (R1), a third resistor (R3), a fourth resistor (R4), and a second resistor (R2) are sequentially connected in series from the first detection end (100) to the second detection end (200).

4. The DC branch insulation position detection device according to claim 3, characterized in that: The resistance values ​​of the second resistor (R2) and the first resistor (R1) are equal; The resistance values ​​of the third resistor (R3) and the fourth resistor (R4) are equal.

5. The DC branch insulation position detection device according to claim 4, characterized in that: The third resistor component comprises: A seventh resistor (R7) and an eighth resistor (R8) connected in series from the first detection end (100) to the second detection end (200); The resistance value of the eighth resistor (R8) is four times the resistance value of the seventh resistor (R7).

6. The DC branch insulation position detection device according to claim 5, characterized in that: The first relay switch (K1) and the second relay switch (K2) enable the winding resistor (Rx), the first resistor (R1), the third resistor (R3) and the seventh resistor (R7) to be connected in parallel, and the varistor (Ry), the fourth resistor (R4), the second resistor (R2) and the eighth resistor (R8) to be connected in parallel.

7. The DC branch insulation position detection device according to claim 6, characterized in that: The value range of the second resistor (R2) is 1.0 to 1.2 MΩ.

8. The DC branch insulation position detection device according to claim 7, characterized in that: The value range of the No. 8 resistor (R8) is 900k to 1000kΩ.

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