Alternating current and direct current measurement module with shielding function

Abstract

The utility model discloses an AC / DC measuring module with a shielding function, comprising a capacitor housing, two ends of the capacitor housing are respectively embedded with an internal capacitor leading-out terminal with a shielding function, one side of the internal capacitor leading-out terminal close to the capacitor housing is provided with a first capacitor electrode plate, and the other side of the internal capacitor leading-out terminal close to the capacitor housing is provided with a second capacitor electrode plate. A second capacitor electrode plate is arranged on the side, close to the capacitor shell, of the internal capacitor leading-out end on the other side, the first capacitor electrode plate and the second capacitor electrode plate are both located in the capacitor shell, and the second capacitor electrode plate is embedded in the first capacitor electrode plate. A high-voltage resistor is arranged between the first capacitor electrode plate and the second capacitor electrode plate, the requirements of an insulation resistance test and an alternating-current withstand voltage test are met at the same time, a shielding layer is formed by the capacitor shell and the two internal capacitor leading-out ends, and under the condition that alternating current and direct current are not affected, the shielding effect is improved, and the high-voltage resistor is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment measurement, in particular to an AC / DC measurement module with a shielding function. Background Art

[0002] Measuring the rotor insulation resistance and AC withstand voltage is an effective means to judge the insulation state of the motor. When the motor insulation is damp, the leakage current is dozens or even hundreds of times the normal value, and the insulation resistance is one-hundredth of the normal value. If the insulation is severely damp and not dried, the generator cannot operate. Measuring the rotor insulation resistance and AC withstand voltage can reflect defects such as overall dampness of the motor insulation, dirt of the impregnating material, and deterioration.

[0003] Currently, measuring the rotor insulation resistance and AC withstand voltage requires a standard capacitor to measure the output AC voltage and a high-voltage resistor to measure the output DC voltage. The capacitor and the high-voltage resistor are large in volume and heavy in weight, making them inconvenient to carry. When conducting separate sequential tests, a capacitor and a high-voltage resistor are used alternately. During the test process, the high-voltage resistor is exposed and easily gets damp, resulting in a decrease in the resistance value. The entire test process requires repeated disconnection and connection of wires, a long test time, and an increased test risk. Therefore, an AC / DC measurement module with a shielding function is needed. Content of the Utility Model

[0004] The utility model provides an AC / DC measurement module with a shielding function, aiming to solve the problems of inconvenient carrying of the capacitor and the high-voltage resistor, inaccurate measurement caused by the resistor getting damp, and cumbersome installation and long test time mentioned above.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] The AC / DC measurement module with a shielding function includes a capacitor housing. At both ends of the capacitor housing, internal capacitor lead-out terminals with a shielding function are respectively embedded. On one side, a first capacitor electrode plate is provided near the capacitor housing for one of the internal capacitor lead-out terminals. On the other side, a second capacitor electrode plate is provided near the capacitor housing for the other internal capacitor lead-out terminal. The first capacitor electrode plate and the second capacitor electrode plate are both located inside the capacitor housing, and the second capacitor electrode plate is embedded in the first capacitor electrode plate without mutual contact. A high-voltage resistor is provided between the first capacitor electrode plate and the second capacitor electrode plate.

[0007] Preferably, the capacitor housing is a capacitor support layer made of an insulating material.

[0008] Preferably, the internal capacitance lead-out terminal provided with the first capacitance electrode plate includes a first shielding layer. One end of the first shielding layer forms potting and threaded fitting with the corresponding end of the capacitor housing. The other end of the first shielding layer extends into the capacitor housing and forms fixed fitting with the first capacitance electrode plate concentrically and coaxially. A first electrode copper column is embedded on the side of the first shielding layer away from the first capacitance electrode plate. The first electrode copper column is exposed from the first shielding layer and forms potting fixed fitting with the first shielding layer, and the first electrode copper column is electrically connected to the first capacitance electrode plate through a wire.

[0009] More preferably, the extending part of the first shielding layer in the capacitor housing is a cylinder. The bottom of the cylinder is potted and threadedly fitted with a first insulating sleeve concentrically and coaxially. The other side of the first insulating sleeve is potted and threadedly fitted with the first capacitance electrode plate concentrically and coaxially, and the first capacitance electrode plate is embedded in the cylinder. After the first electrode copper column penetrates through the first insulating sleeve, it is electrically connected to the first capacitance electrode plate through a wire.

[0010] Preferably, the internal capacitance lead-out terminal provided with the second capacitance electrode plate includes a second shielding layer. One end of the second shielding layer forms potting and threaded fitting with the corresponding end of the capacitor housing. One end of the second shielding layer extends into the capacitor housing and forms fixed fitting with the second capacitance electrode plate concentrically and coaxially. A second electrode copper column is embedded on the side of the second shielding layer away from the second capacitance electrode plate. The second electrode copper column is exposed from the second shielding layer and forms potting fixed fitting with the second shielding layer, and the second electrode copper column is electrically connected to the second capacitance electrode plate through a wire.

[0011] More preferably, the extending part of the second shielding layer in the capacitor housing is a cap. The end of the cap is potted and threadedly fitted with a second insulating sleeve concentrically and coaxially. The other side of the second insulating sleeve is potted and threadedly fitted with the second capacitance electrode plate concentrically and coaxially, and the second capacitance electrode plate is embedded in the first capacitance electrode plate. After the second electrode copper column penetrates through the second insulating sleeve, it is electrically connected to the second capacitance electrode plate through a wire.

[0012] Furthermore, a plurality of mounting holes are provided on the end face of the second shielding layer at equal intervals around the second electrode copper column.

[0013] Preferably, the high-voltage resistor and the second capacitance electrode plate are concentric and coaxial, and the second capacitance electrode plate and the first capacitance electrode plate are concentric and coaxial.

[0014] More preferably, one end of the high-voltage resistor is provided with a thread and forms threaded fitting with the inside of the first capacitance electrode plate, and the other end of the high-voltage resistor is embedded in the second capacitance electrode plate.

[0015] The beneficial effects of the present utility model:

[0016] 1. The utility model is simple and convenient to use and operate. Only through a measurement module can the measurement of the rotor insulation resistance and AC withstand voltage be completed, thereby measuring the DC high voltage and AC high voltage output by the rotor. Moreover, the volume of the measurement module will not increase due to the addition of high-voltage resistors inside. It can not only reduce the number of capacitors and high-voltage resistors used, but also reduce the volume and weight of the detection equipment carried, facilitating the operation of the test personnel;

[0017] 2. By adopting the same shielding layer, the AC and DC are not affected by each other, the shielding effect is improved, and the test safety is enhanced;

[0018] 3. The present invention places the high-voltage resistor inside the shielding layer to prevent the high-voltage resistor from getting damp and causing the resistance value to become smaller, thereby improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the external view provided by the present utility model;

[0020] Figure 2 is the internal structure diagram provided by the present utility model;

[0021] Figure 3 is the circuit diagram of the AC / DC measurement module provided by the present utility model;

[0022] In the figure: 1. Capacitor housing; 2. Mounting hole; 3. Internal capacitor lead-out terminal; 4. Capacitor support layer; 5. First shielding layer; 6. First electrode copper column; 7. First insulating sleeve; 8. First capacitor electrode plate; 9. High-voltage resistor; 10. Second capacitor electrode plate; 11. Second insulating sleeve; 12. Second shielding layer; 13. Second electrode copper column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] As follows, the embodiments will be further described with reference to the drawings.

[0024] As Figures 1 to 3 shown, as a preferred Embodiment 1, an AC / DC measurement module with a shielding function includes a capacitor housing 1. At both ends of the capacitor housing 1, internal capacitor lead-out terminals 3 with a shielding function are respectively embedded. On one side, a first capacitor electrode plate 8 is provided close to the capacitor housing 1 for the internal capacitor lead-out terminal 3. On the other side, a second capacitor electrode plate 10 is provided close to the capacitor housing 1 for the internal capacitor lead-out terminal 3. Both the first capacitor electrode plate 8 and the second capacitor electrode plate 10 are located inside the capacitor housing 1, and the second capacitor electrode plate 10 is embedded inside the first capacitor electrode plate 8 without mutual contact. A high-voltage resistor 9 is provided between the first capacitor electrode plate 8 and the second capacitor electrode plate 10.

[0025] Embodiment 1 provides an AC / DC measurement module with a shielding function. A closed shielding layer is formed by the capacitor housing 1 and two internal capacitor lead-out terminals 3. The first capacitor electrode plate 8, the second capacitor electrode plate 10, and the high-voltage resistor 9 are arranged within the same shielding layer to form a standard capacitor and high-voltage resistor, meeting the requirements of insulation resistance tests and AC withstand voltage tests simultaneously. The AC and DC high voltages output are measured to measure the insulation resistance and AC withstand voltage. The device outputs AC or DC high voltage, and the voltage value output is sampled through the present utility model. When the device conducts an insulation resistance test, the high-voltage value output is obtained first, then the current value on the side of the test object is sampled, and finally the insulation resistance is calculated. When the device conducts an AC withstand voltage test, the high-voltage value output is obtained first, then the capacitance of the device under test to the ground is known, and finally the AC withstand voltage test value is calculated.

[0026] When measuring the insulation resistance and AC withstand voltage of the rotor, the voltage passes through a 100M high-voltage resistor and a 50P capacitor. The high-voltage resistor and the capacitor are protected by the shielding layer. The 50P capacitor is connected to the AC voltage measurement module to measure the AC high voltage output by the rotor, and the 100M high-voltage resistor is connected to the DC voltage measurement module to measure the DC high voltage output by the rotor. The 100M high-voltage resistor is placed within the shielding layer to prevent the resistance value from decreasing due to moisture absorption outside, causing test errors. The two tests are combined to measure the DC high voltage and AC high voltage output by the rotor, eliminating the need to measure the AC high voltage and DC high voltage sequentially, while ensuring that the volume of the measurement module is the same as that of a normal capacitor.

[0027] The present utility model uses the same shielding layer to ensure that AC and DC are not interfered within the same shielding layer, enabling accurate measurement of the AC high voltage and DC high voltage output by the rotor, improving the shielding effect and enhancing test safety.

[0028] The high-voltage resistor 9 is placed within the shielding layer to prevent the resistance value of the high-voltage resistor 9 from decreasing due to moisture absorption, improving test accuracy.

[0029] As a preferred Embodiment 2, the capacitor housing 1 is a capacitor support layer 4 made of insulating material.

[0030] The capacitor support layer 4 is made of epoxy resin, which can support the entire capacitor and provide good insulation.

[0031] As a preferred Embodiment 3, the internal capacitance lead-out terminal 3 provided with the first capacitance electrode plate 8 includes a first shielding layer 5. One end of the first shielding layer 5 forms potting and threaded fit with the corresponding end of the capacitor housing 1. The other end of the first shielding layer 5 extends into the capacitor housing 1 and forms a fixed fit with the first capacitance electrode plate 8 concentrically and coaxially. A first electrode copper column 6 is embedded on the side of the first shielding layer 5 away from the first capacitance electrode plate 8. The first electrode copper column 6 forms potting and fixed fit with the first shielding layer 5 when exposed from the first shielding layer 5, and the first electrode copper column 6 is electrically connected to the first capacitance electrode plate 8 through a wire.

[0032] The first shielding layer 5 is made of aluminum alloy material.

[0033] As a preferred Embodiment 4, the extending part of the first shielding layer 5 inside the capacitor housing 1 is a cylinder. The bottom of the cylinder forms potting and threaded fit with a first insulating sleeve 7 concentrically and coaxially. The other side of the first insulating sleeve 7 forms potting and threaded fit with the first capacitance electrode plate 8 concentrically and coaxially to ensure the firmness of the fixed installation. And the first capacitance electrode plate 8 is embedded in the cylinder. After the first electrode copper column 6 penetrates through the first insulating sleeve 7, it is electrically connected to the first capacitance electrode plate 8 through a wire.

[0034] As a preferred Embodiment 5, the internal capacitance lead-out terminal 3 provided with the second capacitance electrode plate 10 includes a second shielding layer 12. One end of the second shielding layer 12 forms potting and threaded fit with the corresponding end of the capacitor housing 1. One end of the second shielding layer 12 extends into the capacitor housing 1 and forms a fixed fit with the second capacitance electrode plate 10 concentrically and coaxially. A second electrode copper column 13 is embedded on the side of the second shielding layer 12 away from the second capacitance electrode plate 10. The second electrode copper column 13 forms potting and fixed fit with the second shielding layer 12 when exposed from the second shielding layer 12, and the second electrode copper column 13 is electrically connected to the second capacitance electrode plate 10 through a wire for realizing the test.

[0035] The second shielding layer 12 is made of aluminum alloy material.

[0036] As a preferred Embodiment 6, the extending part of the second shielding layer 12 inside the capacitor housing 1 is a cap. The end of the cap forms potting and threaded fit with a second insulating sleeve 11 concentrically and coaxially. The other side of the second insulating sleeve 11 forms potting and threaded fit with the second capacitance electrode plate 10 concentrically and coaxially to ensure the installation firmness. And the second capacitance electrode plate 10 is embedded in the first capacitance electrode plate 8. After the second electrode copper column 13 penetrates through the second insulating sleeve 11, it is electrically connected to the second capacitance electrode plate 10 through a wire for realizing the test.

[0037] As a preferred embodiment 7, a plurality of mounting holes 2 are provided on the end surface of the second shielding layer 12 at equal intervals around the second electrode copper column 13. The mounting holes 2 are used for mounting accessories.

[0038] As a preferred embodiment 8, the high-voltage resistor 9 and the second capacitor electrode plate 10 are concentric and coaxial, and the second capacitor electrode plate 10 and the first capacitor electrode plate 8 are concentric and coaxial.

[0039] The second capacitor electrode plate 10 and the first capacitor electrode plate 8 do not contact each other.

[0040] As a preferred embodiment 9, one end of the high-voltage resistor 9 is provided with a thread and forms a threaded fit with the inside of the first capacitor electrode plate 8, and the other end of the high-voltage resistor 9 is embedded in the second capacitor electrode plate 10.

[0041] As Figure 3 As shown, as a preferred embodiment 10, when measuring the rotor insulation resistance and AC withstand voltage, a voltage of 10000V is input at the high-voltage end through a 100M high-voltage resistor and a capacitor. The high-voltage resistor and the capacitor are protected by a shielding layer. The capacitor is connected to an AC voltage measuring instrument to measure the AC high voltage U1 output by the rotor, and the 100M high-voltage resistor is connected to a DC voltage measuring instrument to measure the DC high voltage U2 output by the rotor.

[0042] Working principle of the present utility model:

[0043] Embodiment 1 provides an AC / DC measurement module with a shielding function. A closed shielding layer is formed by the capacitor housing 1 and two internal capacitor lead-out ends 3, and a first capacitor electrode plate 8, a second capacitor electrode plate 10, and a high-voltage resistor 9 are arranged within the same shielding layer to form a standard capacitor and high-voltage resistor, simultaneously meeting the requirements of insulation resistance tests and AC withstand voltage tests, measuring the output AC and DC high voltages to measure the insulation resistance and AC withstand voltage. The device outputs AC or DC high voltage, and the output voltage value is obtained through sampling by the present utility model. When the device conducts an insulation resistance test, first obtain the output high-voltage value, then sample the current value on the side of the test object, and finally calculate the insulation resistance; when the device conducts an AC withstand voltage test, first obtain the output high-voltage value, and then know the capacitance of the device under test to the ground, and finally calculate the AC withstand voltage test value;

[0044] When measuring the insulation resistance and AC withstand voltage of the rotor, the voltage passes through a 100M high-voltage resistor and a 50P capacitor. The high-voltage resistor and the capacitor are protected by a shielding layer. The 50P capacitor is connected to an AC voltage measurement module to measure the AC high voltage output by the rotor, and the 100M high-voltage resistor is connected to a DC voltage measurement module to measure the DC high voltage output by the rotor. The 100M high-voltage resistor is placed inside the shielding layer to prevent the resistance value from decreasing due to moisture absorption outside, resulting in test errors. The two tests are carried out together to measure the DC high voltage and AC high voltage output by the rotor, without the need to measure the AC high voltage and DC high voltage successively. At the same time, the volume of the measurement module can be ensured to be the same as that of a normal capacitor.

[0045] The utility model adopts the same shielding layer to ensure that the AC and DC are not interfered inside the same shielding layer, and can accurately measure the AC high voltage and DC high voltage output by the rotor, improving the shielding effect and test safety.

[0046] The high-voltage resistor 9 is placed inside the shielding layer to prevent the resistance value of the high-voltage resistor 9 from decreasing due to moisture absorption, improving the test accuracy.

Claims

1. AC / DC measurement module with shielding function, characterized in that: The invention comprises a capacitor housing (1), wherein both ends of the capacitor housing (1) are respectively embedded with internal capacitor lead-out terminals (3) having a shielding function, wherein one side of the internal capacitor lead-out terminal (3) close to the capacitor housing (1) is provided with a first capacitor electrode plate (8), and the other side of the internal capacitor lead-out terminal (3) close to the capacitor housing (1) is provided with a second capacitor electrode plate (10), the first capacitor electrode plate (8) and the second capacitor electrode plate (10) are both located in the capacitor housing (1), and the second capacitor electrode plate (10) is embedded in the first capacitor electrode plate (8) without contacting each other, and a high-voltage resistor (9) is provided between the first capacitor electrode plate (8) and the second capacitor electrode plate (10).

2. The AC / DC measurement module with shielding function according to claim 1, characterized in that: The capacitor housing (1) is a capacitor support layer (4) made of insulating material.

3. The AC / DC measurement module with shielding function according to claim 1, characterized in that: The internal capacitor lead-out terminal (3) provided with a first capacitor electrode plate (8) comprises a first shielding layer (5), one end of the first shielding layer (5) is glue-filled and threadedly matched with the corresponding end of the capacitor housing (1), the other end of the first shielding layer (5) extends into the capacitor housing (1) and is coaxially fixedly matched with the first capacitor electrode plate (8), a first electrode copper column (6) is embedded on the side of the first shielding layer (5) away from the first capacitor electrode plate (8), the first electrode copper column (6) is exposed from the first shielding layer (5) and is glue-filled and fixedly matched with the first shielding layer (5), and the first electrode copper column (6) is electrically connected to the first capacitor electrode plate (8) through a wire.

4. The AC / DC measurement module with shielding function according to claim 3, characterized in that: The extension of the first shielding layer (5) in the capacitor housing (1) is a cylinder, the bottom of the cylinder is coaxially and concentrically filled with glue and threadedly matched with a first insulating sleeve (7), the other side of the first insulating sleeve (7) is coaxially and concentrically filled with glue and threadedly matched with a first capacitor electrode plate (8), and the first capacitor electrode plate (8) is embedded in the cylinder, and the first electrode copper column (6) passes through the first insulating sleeve (7) and is electrically connected to the first capacitor electrode plate (8) through a wire.

5. The AC / DC measurement module with shielding function according to claim 1, characterized in that: The internal capacitor lead-out terminal (3) provided with a second capacitor electrode plate (10) comprises a second shielding layer (12), one end of the second shielding layer (12) is glue-filled and threadedly matched with the corresponding end of the capacitor housing (1), one end of the second shielding layer (12) extends into the capacitor housing (1) and is coaxially and concentrically fixedly matched with the second capacitor electrode plate (10), a second electrode copper column (13) is embedded on the side of the second shielding layer (12) away from the second capacitor electrode plate (10), the second electrode copper column (13) is exposed from the second shielding layer (12) and is glue-filled and fixedly matched with the second shielding layer (12), and the second electrode copper column (13) is electrically connected to the second capacitor electrode plate (10) through a wire.

6. The AC / DC measurement module with shielding function according to claim 5, characterized in that: The extension of the second shielding layer (12) in the capacitor housing (1) is a cap body, and the end of the cap body is coaxially and glue-filled and threadedly matched with a second insulating sleeve (11), and the other side of the second insulating sleeve (11) is coaxially and glue-filled and threadedly matched with the second capacitor electrode plate (10), and the second capacitor electrode plate (10) is embedded in the first capacitor electrode plate (8), and the second electrode copper column (13) passes through the second insulating sleeve (11) and is electrically connected to the second capacitor electrode plate (10) through a wire.

7. The AC / DC measurement module with shielding function according to claim 6, characterized in that: A plurality of mounting holes (2) are provided at equal intervals on the end surface of the second shielding layer (12) around the second electrode copper column (13).

8. The AC / DC measurement module with shielding function according to claim 1, characterized in that: The high-voltage resistor (9) and the second capacitor electrode plate (10) are coaxially concentric, and the second capacitor electrode plate (10) and the first capacitor electrode plate (8) are coaxially concentric.

9. The AC / DC measurement module with shielding function according to claim 8, characterized in that: One end of the high-voltage resistor (9) is provided with a thread and is threadedly matched with the first capacitor electrode plate (8), and the other end of the high-voltage resistor (9) is embedded in the second capacitor electrode plate (10).

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