Impedance measuring device

Abstract

An impedance measuring device comprises a third box body, a second box body and a first box body which are sequentially arranged from front to back, the first box body comprises a main incoming and outgoing line chamber with an incoming line and an outgoing line, and a current detection device and a voltage detection device which are arranged on the outgoing line, and the second box body comprises a coupling transformer and a step-down transformer. The third box body comprises a power cabinet and a cascade transformer, the step-down transformer is electrically connected with the power cabinet and the incoming line through cables, the coupling transformer is electrically connected with the cascade transformer and the outgoing line through cables, and the power cabinet is electrically connected with the cascade transformer through a cable. According to the impedance measuring device, high-voltage equipment and low-voltage equipment are separately arranged in the box body, the structure is compact, the layout is reasonable, the safety performance is good, and later maintenance and operation of maintainers are facilitated; and the arrangement positions of the three box bodies facilitate wiring of equipment in the box bodies and among the box bodies, the length of wires among the equipment is saved, cable materials are saved, and the material cost is low.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to an impedance measuring device. Background Technology

[0002] With the development of society and the economy, people's demand for electricity is constantly increasing, and the proportion of new energy power generation such as wind power and photovoltaic power generation in the power grid is getting higher and higher. At the same time, higher and higher requirements are being placed on the power quality of the power grid. Impedance measurement devices are multifunctional disturbance generators that can measure the impedance characteristics of new energy power generation ports. They can provide power system operators with more comprehensive monitoring and evaluation tools, so their application in the power grid is becoming increasingly widespread.

[0003] However, existing impedance measurement devices typically house all the equipment in a single enclosure, resulting in a very large size, an insufficiently compact structure, and an unreasonable layout, which can easily lead to safety hazards.

[0004] Therefore, there is an urgent need to develop an impedance measurement device that is compact, small in size, rationally laid out, and has good safety performance. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an impedance measuring device with a compact structure, small size, reasonable layout, and good safety performance, thereby solving the above-mentioned technical problems.

[0006] An impedance measuring device includes a third enclosure, a second enclosure, and a first enclosure arranged sequentially. The first enclosure includes a main inlet / outlet chamber with an inlet and an outlet, a current detection device, and a voltage detection device installed on the outlet. The second enclosure includes a coupling transformer and a step-down transformer. The third enclosure includes a power cabinet and a cascaded transformer. The step-down transformer is electrically connected to the power cabinet and the inlet via cables. The coupling transformer is electrically connected to the cascaded transformer and the outlet via cables. The power cabinet and the cascaded transformer are electrically connected to each other via cables.

[0007] Preferably, a bypass switch compartment is also provided on the left side of the main incoming and outgoing line compartment in the first enclosure. The bypass switch compartment is provided with a bypass busbar that is electrically connected to the power grid, an input bypass switch cabinet and an output bypass switch cabinet that are electrically connected to the bypass busbar respectively. The incoming line is connected to the input bypass switch cabinet and then to the step-down transformer, and the outgoing line is connected to the output bypass switch cabinet and then to the coupling transformer.

[0008] Preferably, a circuit breaker compartment is further provided on the left side of the bypass switch compartment within the first enclosure. The circuit breaker compartment is equipped with an input circuit breaker and a second circuit breaker. The two ends of the input circuit breaker are respectively connected to the input bypass switch cabinet and the step-down transformer. The two ends of the second circuit breaker are respectively connected to the output bypass switch cabinet and the coupling transformer. A bypass circuit breaker is also provided between the input circuit breaker and the second circuit breaker. The voltage detection device is located in the circuit breaker compartment and connected to the second circuit breaker.

[0009] Preferably, an operating room is provided between the circuit breaker compartment and the bypass switch compartment of the first enclosure; the second enclosure is provided with a transformer compartment and a material compartment, and the coupling transformer and the step-down transformer are located in the transformer compartment; a thyristor module for detecting the output current of the cascaded transformer is provided on the left side of the third enclosure, and the thyristor module is connected in parallel with the power cabinet.

[0010] Preferably, the second enclosure has a rear side panel on the side closest to the first enclosure. The rear side panel has a high-voltage wiring window and a high-voltage inlet hole. The high-voltage inlet hole is located below the high-voltage wiring window. A high-voltage terminal block is located at the corresponding position of the high-voltage wiring window inside the second enclosure.

[0011] Preferably, the high-voltage wiring window includes a first window frame disposed on the rear side panel, a first window door that matches the size of the first window frame, one end of the first window door being hinged to the first window frame, and the other end being provided with a first locking rod that can be locked to the first window frame, a first sealing strip being disposed around the first window frame, and a first limit switch being disposed on the first window frame.

[0012] Preferably, the second enclosure has a front panel on the side near the third enclosure, the front panel has a low-voltage wiring window and a low-voltage inlet hole, the low-voltage inlet hole is located below the low-voltage wiring window, and a low-voltage terminal block is provided at the corresponding position of the low-voltage wiring window in the second enclosure.

[0013] Preferably, the low-voltage wiring window includes a second window frame disposed on the front side panel and a second window door that matches the size of the second window frame. One end of the second window door is hinged to the upper end of the second window frame, and the other end is provided with a second locking rod that can be locked to the second window frame. A second sealing strip is provided around the second window frame. A second limit switch is also provided on the second window frame. A support rod with one end movably fixed to the second window door and the other end being free is also provided on the inner side of the second window door. The second window door is provided with a buckle that movably fixes the free end of the support rod. A support groove is provided on the second window frame for the free end of the support rod to be engaged.

[0014] Preferably, the impedance measuring device is further provided with a third window that matches the size of the low-voltage inlet hole. One end of the third window is hinged to the right end of the low-voltage inlet hole, and the other end is provided with a third locking rod that can be locked into the low-voltage inlet hole.

[0015] Preferably, a radiator is provided inside the second housing, and air inlets are provided on the lower parts of the front and rear side panels of the second housing, and air outlets are provided on the upper parts of the front and rear side panels of the second housing, respectively. S-shaped louvers are provided at the air inlets and air outlets.

[0016] Compared with the prior art, this utility model has the following advantages: The impedance measuring device of this utility model includes a third box, a second box, and a first box arranged sequentially. The main incoming and outgoing line room connecting to the external high-voltage power grid is set up separately in the first box. The low-voltage equipment power cabinet and cascaded transformer are set up in the third box. The high-voltage equipment coupling transformer and step-down transformer that need to connect both high-voltage incoming and outgoing lines and low-voltage equipment are set up in the second box. The high-voltage and low-voltage equipment are set up in separate boxes, which is compact, reasonable in layout, and has good safety performance, which is conducive to the later maintenance and operation of maintenance personnel. Moreover, the arrangement of the three boxes facilitates the wiring of equipment inside and between boxes, saves the length of wiring between equipment, saves cable materials, and reduces material costs. Compared with the prior art which uses a single box, the impedance measuring device of this utility model has a more compact structure and a smaller overall volume. Attached Figure Description

[0017] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0018] Figure 1 This is a top view schematic diagram of an impedance measuring device according to the present invention;

[0019] Figure 2 This is a rear view structural diagram of the second housing of an impedance measuring device according to this utility model;

[0020] Figure 3 This is a schematic diagram of the main structure of the second housing of an impedance measuring device according to this utility model;

[0021] Figure 4 This is a schematic diagram of the high-voltage wiring window of an impedance measuring device according to this utility model;

[0022] Figure 5 This is a schematic diagram of the low-voltage wiring window of an impedance measuring device according to this utility model. Detailed Implementation

[0023] The present invention will be further described in conjunction with the following embodiments and accompanying drawings:

[0024] An impedance measuring device, such as Figure 1 As shown, the enclosure includes a third enclosure 10, a second enclosure 11, and a first enclosure 12 arranged sequentially. The first enclosure 12 includes a main inlet / outlet compartment 15 with an inlet line 13 and an outlet line 14, a current detection device 16 and a voltage detection device 17 installed on the outlet line 14. The second enclosure 11 includes a coupling transformer 18 and a step-down transformer 19. The third enclosure 10 includes a power cabinet 20 and a cascaded transformer 21. The step-down transformer 19 is electrically connected to the power cabinet 20 and the inlet line 13 via cables 22. The coupling transformer 18 is electrically connected to the cascaded transformer 21 and the outlet line 14 via cables 22. The power cabinet 20 and the cascaded transformer 21 are electrically connected to each other via cables.

[0025] Specifically, one end of the incoming line 13 is connected to the external power grid, and one end of the outgoing line 14 is also connected to the external power grid. The step-down transformer 19 is used to step down the voltage of the external high-voltage power grid to the voltage required for the impedance measurement device to operate; the power cabinet 20 is used for power conversion to achieve controlled output harmonic voltage; the cascaded transformer 21 is used to cascade the output voltage, providing output voltage harmonic capability and quality; and the coupling transformer 18 is used to couple the harmonic voltage controlled by the impedance measurement device to the high-voltage power grid. The current detection device 16 measures the current on the outgoing line 14, and the voltage detection device 17 measures the voltage on the outgoing line 14. Through data acquisition and analysis, the impedance of the device under test is calculated.

[0026] The impedance measuring device of this utility model includes a third enclosure 10, a second enclosure 11, and a first enclosure 12 arranged sequentially. The main incoming and outgoing line room 15, which connects to the external high-voltage power grid, is separately located in the first enclosure 12. The low-voltage equipment power cabinet 20 and the cascaded transformer 21 are located in the third enclosure 10. The high-voltage equipment coupling transformer 18 and the step-down transformer 19, which need to connect both the high-voltage incoming line 13 and outgoing line 14 and the low-voltage equipment, are located in the second enclosure 11. The high-voltage and low-voltage equipment are set up in separate enclosures, resulting in a compact structure, reasonable layout, good safety performance, and facilitating maintenance and operation by maintenance personnel. Furthermore, the arrangement of the three enclosures facilitates wiring between devices within and between enclosures, saving on the length of wiring between devices and the material of the cable 22, thus reducing material costs. Compared with the prior art which uses a single enclosure, the impedance measuring device of this utility model has a more compact structure and a smaller overall volume.

[0027] Better, such as Figure 1As shown, a bypass switch compartment 23 is also provided on the left side of the main incoming and outgoing line compartment 15 inside the first enclosure 12. The bypass switch compartment 23 is equipped with a bypass busbar that is electrically connected to the power grid, an input bypass switch cabinet 24 and an output bypass switch cabinet 25 that are electrically connected to the bypass busbar respectively. The incoming line 13 is connected to the input bypass switch cabinet 24 and then to the step-down transformer 19. The outgoing line 14 is connected to the output bypass switch cabinet 25 and then to the coupling transformer 18.

[0028] When the step-down transformer or coupling transformer 18 fails, the line or equipment to be repaired can be switched to the bypass bus without interrupting the power supply through the input bypass switch cabinet 24 and the output bypass switch cabinet 25. Thus, the step-down transformer 19 or coupling transformer 18 can be repaired or the fault handled without interrupting the power grid.

[0029] Better, such as Figure 1 As shown, a circuit breaker compartment 26 is also provided on the left side of the bypass switch compartment 23 inside the first enclosure 12. The circuit breaker compartment 26 is equipped with an input circuit breaker (not shown in the figure) and an output circuit breaker (not shown in the figure). The two ends of the input circuit breaker (not shown in the figure) are connected to the input bypass switch cabinet 24 and the step-down transformer 19, respectively. The two ends of the output circuit breaker (not shown in the figure) are connected to the output bypass switch cabinet 25 and the coupling transformer 18, respectively. A bypass circuit breaker 27 is also provided between the input circuit breaker (not shown in the figure) and the output circuit breaker (not shown in the figure). The voltage detection device 17 is located in the circuit breaker compartment 26 and is connected to the output circuit breaker (not shown in the figure).

[0030] The main function of the input circuit breaker (not shown in the figure) and the output circuit breaker (not shown in the figure) is to disconnect the circuit to protect the step-down transformer 19 and the coupling transformer 18 in the power system from overload, short circuit and other faults. Of course, when the output line 14 of the step-down transformer 19 or the coupling transformer 18 fails, the step-down transformer 19 or the coupling transformer 18 can also be disconnected from the external power grid by the input circuit breaker (not shown in the figure) or the output circuit breaker (not shown in the figure) to avoid the external power grid being affected by the fault. The input circuit breaker (not shown in the figure) and the output circuit breaker (not shown in the figure) can quickly disconnect the faulty circuit to ensure the normal operation of the fault-free part. The bypass circuit breaker 27 is connected between the input circuit breaker (not shown in the figure) and the output circuit breaker (not shown in the figure) for bypassing the coupling equipment.

[0031] Better, such as Figure 1 As shown, an operating room 28 is provided between the circuit breaker compartment 26 and the bypass switch compartment 23 of the first enclosure 12. The second enclosure 11 is provided with a transformer compartment 29 and a material compartment 30. The coupling transformer 18 and the step-down transformer 19 are located in the transformer compartment 29. The left side of the third enclosure 10 is provided with a thyristor module 60 for detecting the output current of the cascaded transformer 21. The thyristor module 60 is connected in parallel with the power cabinet 20.

[0032] An operating room 28 is provided between the circuit breaker compartment 26 and the bypass switch compartment 23 in the first enclosure 12, facilitating the operator's observation and operation of the components within these compartments. A material compartment 30 can be used to store wires and equipment, providing convenient access to necessary materials during maintenance and repair. The coupling transformer 18 and the step-down transformer 19 are located within the transformer compartment 29, separated from the material compartment 30, which facilitates the isolation of high-voltage equipment and ensures safety and reliability.

[0033] The thyristor module 60 detects the output current of the cascaded transformer 21. When it detects that the output current of the cascaded transformer 21 is too high, it can promptly bypass the power cabinet 20, i.e., disconnect the power cabinet 20, thus preventing damage to the components inside the power cabinet 20 due to excessive current and protecting the power cabinet 20. The thyristor module 60 is located on the left side of the third enclosure 10, which facilitates the detection of the output current of the cascaded transformer 21, with short wiring, low power flow, and a compact structure.

[0034] Better, such as Figure 1 , Figure 2 and Figure 4 As shown, a rear side plate 31 is provided on the side of the second housing 11 near the first housing 12. The rear side plate 31 is provided with a high-voltage wiring window 32 and a high-voltage inlet hole 33. The high-voltage inlet hole 33 is located below the high-voltage wiring window 32. A high-voltage terminal block 34 is provided at the corresponding position of the high-voltage wiring window 32 inside the second housing 11.

[0035] A high-voltage wiring window 32 and a high-voltage inlet hole 33 are provided on the rear panel 31 near the first enclosure 12 to facilitate the wiring of the high-voltage cable 22 between the second enclosure 11 and the first enclosure 12. Specifically, when wiring the high-voltage cable 22, the external high-voltage cable 22 passes upward into the second enclosure 11 through the high-voltage inlet hole 33 located below. When the high-voltage cable 22 reaches the position of the high-voltage wiring window 32, the operator connects the high-voltage cable 22 to the high-voltage terminal 34 through the high-voltage wiring window 32. The provision of the high-voltage wiring window 32 and the high-voltage inlet hole 33 eliminates the need for the operator to enter the second enclosure 11 to wire the high-voltage cable 22, facilitating the wiring of the high-voltage cable 22 in the second enclosure 11 and improving the safety of the operator.

[0036] Better, such as Figure 4 As shown, the high-voltage wiring window 32 includes a first window frame 35 disposed on the rear side plate 31, a first window door 36 that is sized to match the first window frame 35, one end of the first window door 36 being hinged to the first window frame 35, and the other end being provided with a first locking rod 37 that can be locked to the first window frame 35, a first sealing strip 38 being disposed around the first window frame 35, and a first limit switch 39 being disposed on the first window frame 35.

[0037] The hinge connection between the first window frame 35 and the first window door 36 can be located on either the left or right side of the first window frame 35, depending on the placement and requirements of the second enclosure 11. When high-voltage cables need to be installed, the first window door 36 is opened for high-voltage wiring; after installation, the first window door 36 is closed and locked to the first window frame 35 using the first locking rod 37. This arrangement of the first window frame 35 and the first window door 36 facilitates wiring for the operator and provides a dustproof and waterproof seal for the high-voltage wiring window 32, protecting the equipment inside the second enclosure 11 and thus improving its protection level. A first sealing strip 38 is installed around the first window frame 35, specifically at the contact point between the first window frame 35 and the first window door 36. This improves the seal between the first window frame 35 and the first window door 36 when the first window door 36 is closed, further enhancing dustproof and waterproof protection and improving the overall protection level of the second enclosure 11. A first limit switch 39 is installed on the first window frame 35. When the first window door 36 is opened, the operation of the equipment in the second enclosure 11 is stopped by the linkage action of the first limit switch 39, thereby ensuring the personal safety of the operator.

[0038] Better, such as Figure 1 , Figure 3 and Figure 5 As shown, a front panel 40 is provided on the side of the second housing 11 near the third housing 10. The front panel 40 is provided with a low-voltage wiring window 41 and a low-voltage inlet hole 42. The low-voltage inlet hole 42 is located below the low-voltage wiring window 41. A low-voltage terminal block 43 is provided at the corresponding position of the low-voltage wiring window 41 inside the second housing 11.

[0039] A low-voltage wiring window 41 and a low-voltage inlet hole 42 are provided on the front panel 40 near the third enclosure 10 to facilitate the wiring of low-voltage cables 22 between the second enclosure 11 and the third enclosure 10. Specifically, when wiring low-voltage cables, the external low-voltage cable 22 passes upward into the second enclosure 11 through the lower low-voltage inlet hole 42. When the low-voltage cable 22 reaches the position of the low-voltage wiring window 41, the operator connects the low-voltage cable 22 to the low-voltage terminal 43 through the low-voltage wiring window 41. The provision of the low-voltage wiring window 41 and the low-voltage inlet hole 42 eliminates the need for the operator to enter the second enclosure 11 to wire the low-voltage cable 22, facilitating the wiring of low-voltage cables 22 in the second enclosure 11 and improving the safety of the operator.

[0040] Better, such as Figure 5As shown, the low-voltage wiring window 41 includes a second window frame 44 disposed on the front side panel 40 and a second window door 45 that is sized to match the second window frame 44. One end of the second window door 45 is hinged to the upper end of the second window frame 44, and the other end is provided with a second locking rod 46 that can be locked to the second window frame 44. A second sealing strip 47 is provided around the second window frame 44. A second limit switch 48 is also provided on the second window frame 44. A support rod 49 is provided on the inner side of the second window door 45, with one end movably fixed to the second window door 45 and the other end being free. The second window door 45 is provided with a buckle 50 that movably fixes the free end of the support rod 49. A support groove 51 is provided on the second window frame 44 for the free end of the support rod 49 to be engaged.

[0041] One end of the second window door 45 is hinged to the upper end of the second window frame 44, meaning the second window door 45 opens upwards. Of course, the hinge connection between the second window frame 44 and the second window door 45 can also be located on the left or right side of the second window frame 44, depending on the placement of the second housing 11 and other requirements. When installing the low-voltage cable 22, open the second window door 45 upwards, pull out the free end of the support rod 49, which is movably fixed to the clip 50, from the clip 50, and then insert the free end of the support rod 49 into the support groove 51 of the second window frame 44. The support rod 49 provides support for the second window door 45, facilitating the operator's installation of the low-voltage cable. After the low-voltage cable is installed, remove the free end of the support rod 49 from the support groove 51, insert the free end of the support rod 49 back into the clip 50 of the second window door 45, close the second window door 45, and finally lock the second window door 45 onto the second window frame 44 using the second locking rod 46.

[0042] The coordinated arrangement of the second window frame 44 and the second window door 45 facilitates wiring for the operator and provides a dustproof and waterproof seal for the low-voltage wiring window 41, thus protecting the equipment inside the second enclosure 11 and improving its protection level. A second sealing strip 47 is installed around the second window frame 44 at the contact point between the second window frame 44 and the second window door 45. This improves the seal between the second window frame 44 and the second window door 45 when the second window door 45 is closed, further enhancing the dustproof and waterproof effect and improving the protection level of the second enclosure 11. A second limit switch 48 is installed on the second window frame 44. When the second window door 45 is opened, the operation of the equipment inside the second enclosure 11 is stopped by the linkage action of the second limit switch 48, thereby ensuring the personal safety of the operator.

[0043] Better, such as Figure 5 As shown, the impedance measuring device is also equipped with a third window 52 that matches the size of the low-voltage inlet hole 42. One end of the third window 52 is hinged to the right end of the low-voltage inlet hole 42, and the other end is equipped with a third locking rod 53 that can be locked into the low-voltage inlet hole 42.

[0044] The hinged connection between the low-voltage inlet hole 42 and the third window door 52 can be located at the right end of the low-voltage inlet hole 42, or at the left end as needed. The specific location depends on the placement of the second enclosure 11 and the requirements. When low-voltage cables need to be installed, the third window door 52 is opened, and the low-voltage cable 22 is inserted into the low-voltage inlet hole 42. When low-voltage cables 22 are not needed, the third window door 52 is closed, and the third locking rod 53 locks the third window door 52 to the low-voltage inlet hole 42. The coordinated arrangement of the third window door 52 and the low-voltage inlet hole 42 provides a dustproof and waterproof seal for the low-voltage inlet hole 42 when low-voltage cables 22 are not needed, which helps protect the equipment inside the second enclosure 11 and thus improves the protection level of the second enclosure 11.

[0045] Better, such as Figure 2 and Figure 3 As shown, a radiator (not shown in the figure) is installed inside the second housing 11. Air inlets 54 are respectively provided on the lower part of the front side panel 40 and the rear side panel 31 of the second housing 11, and air outlets 55 are respectively provided on the upper part of the front side panel 40 and the rear side panel 31 of the second housing 11. S-shaped louvers are respectively provided at the air inlets 54 and the air outlets 55.

[0046] The second enclosure 11 is equipped with a radiator (not shown in the figure). The radiator (not shown in the figure) can be an existing air-cooled or water-cooled radiator (not shown in the figure). The radiator (not shown in the figure) installed in the second enclosure 11 can quickly dissipate heat from the equipment inside the second enclosure 11, preventing damage to the equipment inside the second enclosure 11 due to untimely heat dissipation or excessive temperature, thereby ensuring the normal operation of the equipment inside the second enclosure 11 and extending the life of the equipment inside the second enclosure 11.

[0047] Air inlets 54 are respectively provided on the lower parts of the front side panel 40 and the rear side panel 31 of the second enclosure 11, and air outlets 55 are respectively provided on the upper parts of the front side panel 40 and the rear side panel 31 of the second enclosure 11. Cold air from outside the second enclosure 11 can enter the second enclosure 11 through the air inlets 54. The cold air absorbs the heat of the equipment inside the second enclosure 11 and becomes hot air, which then flows out from the air outlets 55. The arrangement of the air inlets 54 and the air outlets 55 can improve the heat dissipation efficiency of the second enclosure 11, resulting in good heat dissipation effect.

[0048] S-shaped louvers are installed at the air inlet 54 and the air outlet 55 respectively. The S-shaped louvers can ensure the flow of heat dissipation air and also have the effects of dust prevention and waterproofing, which can further improve the protection level of the second enclosure 11.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. An impedance measuring device, characterized by: The first cabinet includes a total incoming and outgoing line chamber with an incoming line and an outgoing line, a current detection device and a voltage detection device arranged on the outgoing line, the second cabinet includes a coupling transformer and a step-down transformer, the third cabinet includes a power cabinet and a cascade transformer, the step-down transformer is electrically connected with the power cabinet and the incoming line through a cable respectively, the coupling transformer is electrically connected with the cascade transformer and the outgoing line through a cable respectively, and the power cabinet and the cascade transformer are electrically connected through a cable.

2. An impedance measuring device according to claim 1, characterised in that: The left side of the total incoming and outgoing line chamber in the first cabinet is further provided with a bypass switch chamber, the bypass switch chamber is provided with a bypass bus connected with a power grid, an input bypass switch cabinet and an output bypass switch cabinet connected with the bypass bus respectively, the incoming line is connected with the input bypass switch cabinet and then connected to the step-down transformer, and the outgoing line is connected with the output bypass switch cabinet and then connected to the coupling transformer.

3. An impedance measuring device according to claim 2, characterised in that: The left side of the bypass switch chamber in the first cabinet is further provided with a circuit breaker chamber, the circuit breaker chamber is provided with an input circuit breaker and a second circuit breaker, two ends of the input circuit breaker are connected with the input bypass switch cabinet and the step-down transformer respectively, two ends of the second circuit breaker are connected with the output bypass switch cabinet and the coupling transformer respectively, a bypass circuit breaker is further arranged between the input circuit breaker and the second circuit breaker, and the voltage detection device is arranged in the circuit breaker chamber and connected with the second circuit breaker.

4. An impedance measuring device according to claim 3, characterised in that: The circuit breaker chamber and the bypass switch chamber of the first cabinet are provided with an operation chamber, the second cabinet is provided with a transformer chamber and a material chamber, the coupling transformer and the step-down transformer are arranged in the transformer chamber, and the left side of the third cabinet is provided with a thyristor module for detecting the output current of the cascade transformer, and the thyristor module is connected in parallel with the power cabinet.

5. An impedance measuring device according to claim 1, characterized in that: The side of the second cabinet close to the first cabinet is provided with a rear side plate, the rear side plate is provided with a high-voltage wiring window and a high-voltage incoming line hole in communication, the high-voltage incoming line hole is arranged below the high-voltage wiring window, and a high-voltage wiring column is arranged at the corresponding position of the high-voltage wiring window in the second cabinet.

6. An impedance measuring device according to claim 5, characterised in that: The high-voltage wiring window includes a first window frame arranged on the rear side plate, a first window door matched in size with the first window frame, one end of the first window door is hingedly connected with the first window frame, the other end of the first window door is provided with a first lock rod capable of being locked with the first window frame, a first sealing strip is arranged around the first window frame, and a first travel switch is further arranged on the first window frame.

7. An impedance measuring device according to claim 6, characterised in that: The side of the second cabinet close to the third cabinet is provided with a front side plate, the front side plate is provided with a low-voltage wiring window and a low-voltage incoming line hole, the low-voltage incoming line hole is arranged below the low-voltage wiring window, and a low-voltage wiring column is arranged at the corresponding position of the low-voltage wiring window in the second cabinet.

8. An impedance measuring device according to claim 7, characterised in that: The low-voltage wiring window comprises a second window frame arranged on the front side plate, a second window door matched in size with the second window frame, one end of the second window door being hingedly connected with the upper end of the second window frame, the other end of the second window door being provided with a second lock rod capable of being locked with the second window frame, the periphery of the second window frame being provided with a second sealing strip, the second window frame being further provided with a second travel switch, the inner side of the second window door being further provided with a support rod having one end fixedly arranged on the second window door and the other end being a free end, the second window door being provided with a buckle for fixedly arranging the free end of the support rod, the second window frame being provided with a support groove for clamping the free end of the support rod.

9. An impedance measuring device according to claim 8, characterised in that: The impedance measuring device is further provided with a third window door matched in size with the low-voltage incoming line hole, one end of the third window door being hingedly connected with the right end of the low-voltage incoming line hole, the other end of the third window door being provided with a third lock rod capable of being locked with the low-voltage incoming line hole.

10. An impedance measuring device according to claim 9, characterised in that: The second box body is provided with a radiator, the lower part of the front side plate and the rear side plate of the second box body is respectively provided with an air inlet, the upper part of the front side plate and the rear side plate of the second box body is respectively provided with an air outlet, S-shaped louver is arranged at the air inlet and the air outlet respectively.

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