Electric power experiment signal acquisition device with adjustable signal transformation ratio

Abstract

The invention discloses an electric power experiment signal acquisition device with an adjustable signal transformation ratio, and relates to the technical field of electric power equipment. In order to solve the problem that a resistor is inconvenient to replace in the existing electric power experiment signal acquisition, the invention provides the following technical scheme: the device comprises an electrical layer, a control layer and an interaction layer which are packaged through a shell; the electrical layer comprises a ground wire, a voltage loop wire and a current loop wire which are connected in parallel; the interaction layer is provided with a resistor replacement module, the resistor replacement module comprises a bottom plate, a pin fixer and a thick-film resistor, the bottom plate is fixed on the shell, a pin of the thick-film resistor is placed in the pin fixer, and the thick-film resistor is fixed through pressure applied by a fixing screw; and the tail end of the pure copper plate in the pin fixer is connected with a current loop wire through a welded wire. The experiment flexibility and accuracy are improved, the user interaction experience is enhanced, the safety and reliability of the device are improved, maintenance and upgrading are facilitated, and the experiment cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, and in particular to an electric power experimental signal acquisition device with adjustable signal transformation ratio. Background Art

[0002] In the process of conducting high-voltage fault experiments, researchers collected electrical data for analysis through fault recorders. However, fault recorders collect signal waveforms and cannot directly see the changes in the effective value of current or voltage signals. Some recorders cannot observe changes in electrical signals during signal recording and can only convert effective values ​​after collection. In experiments, signal changes are important information for controlling the progress of the experiment. If the current signal is about to be too large to damage the line, and the data changes in real time are visible, the power can be cut off in time before the line is damaged, and more signals can be collected for analysis under the premise of protecting the line. There are already devices similar to clamp ammeters on the market that can display the effective value of the collected secondary current signal in real time, but this type of equipment needs to be connected in series to the loop and cannot be converted to the primary side. Multiple lines require multiple clamp ammeters, and they are expensive.

[0003] Commonly used voltage fault recorders cannot directly collect current signals. They need to connect a suitable collection resistor in series in the loop to collect the current signal flowing through the resistor by collecting the voltage signal at both ends of the resistor. However, many resistor pins are short, and connecting them to the loop in the conventional way may result in incomplete signal waveforms due to unstable connections, and welding is very troublesome.

[0004] The transformers on the experimental platform are often fixed. The secondary side of the voltage transformer cannot be short-circuited, and the secondary side of the current transformer cannot be open-circuited. When a certain transformer is not in use, it is necessary to manually check the condition of the secondary side of the transformer. However, there are many transformers and lines in the experimental platform. Manual inspection may lead to negligence and experimental accidents, which poses potential risks. Summary of the invention

[0005] The purpose of the present invention is to provide an electric power experiment signal acquisition device with adjustable signal transformation ratio, so as to solve the problem of inconvenience in replacing resistors in the existing electric power experiment signal acquisition.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A power experiment signal acquisition device with adjustable signal transformation ratio comprises: an electrical layer arranged at the bottom of the device, a control layer arranged in the middle of the device and an interactive layer arranged at the top of the device, wherein the device is packaged by a shell; the electrical layer comprises a ground wire, a voltage loop conductor and a current loop conductor; a resistor replacement module is arranged on the interactive layer, the resistor replacement module comprises a bottom plate, a pin holder and a thick film resistor, the bottom plate is fixed on the shell, the pins of the thick film resistor are placed in the pin holder, and the thick film resistor is fixed by the pressure applied by the fixing screws, and the end of the pure copper plate in the pin holder is connected to the current loop conductor by a welded wire.

[0008] Preferably, the control layer includes a sensor group and a control module, and the sensor group and the control module are communicatively connected.

[0009] Preferably, the interaction layer includes a label and a switch, the label is communicatively connected to the control module, and content is typed into the label through the keyboard; the switch includes a voltage loop switch and a current loop switch, the switch is connected in series in the voltage loop wire and the current loop wire of the electrical layer to control the connection and disconnection of the loop; when the voltage loop switch is disconnected, the single voltage loop wire is disconnected, and when the current loop switch is disconnected, the two current loop wires are short-circuited.

[0010] Preferably, the interaction layer further includes a numerical table, which is connected to the control module of the control layer and is used to display voltage or current values.

[0011] Preferably, the interaction layer also includes an interaction module, which includes a screen and a keyboard. The screen is used to display the operation process. The effective value of the secondary side signal of the mutual inductor collected by the sensor group is converted into the primary side effective value through the information typed on the keyboard. The effective value of the signal of the current loop is displayed through a numerical table or converted to the effective value of the primary side signal.

[0012] Preferably, the control module includes a power module, a signal conditioning circuit, a microcontroller and a keyboard control chip. The power module supplies power to the signal conditioning circuit, the microcontroller, the keyboard control chip, the sensor group, the switch, the numerical table and the interactive module. The sensor group transmits the collected voltage and current signals to the microcontroller through the signal conditioning circuit. The information typed on the keyboard is transmitted to the keyboard control chip for processing and then transmitted to the microcontroller. The microcontroller controls the numerical table, the switch and the screen.

[0013] Preferably, the upper end of the shell is provided with a wiring terminal and a ground screw column, the lower end is provided with a pure copper terminal, and a power socket is provided on the left side. The wiring terminal is connected to the pure copper terminal of the electrical layer through a voltage loop wire and a current loop wire, and the ground screw column is connected to the electrical layer through a ground wire.

[0014] Preferably, there are two pillars under the pin holder, the backs of the two pillars are fixed to the same baffle, the pillars pass through holes and are fixed to the bottom plate, the pin holder can move left and right, and there are long openings on both sides of the pin holder shell, which can be used to fix the pins of the metal film resistor.

[0015] Preferably, it also includes a voltage loop, which includes wiring terminals, labels, switches, numerical tables, pure copper terminals and voltage loop wires. The wiring terminals are connected to the secondary side signal wires of the voltage transformer, the wiring terminals and the pure copper terminals are connected through the voltage loop wires, the voltage loop switch is connected in series in the voltage loop, and the sensor group detects the voltage value between the voltage loop wires and the ground wire.

[0016] Preferably, it also includes a current loop, which includes wiring terminals, labels, switches, value tables, resistance replacement modules, pure copper terminals and current loop wires. The wiring terminals are connected to the secondary side signal lines of the current transformer, the wiring terminals and the pure copper terminals are connected through the current loop wires, the current loop switch is connected in series in the current loop, the sensor group detects the current value in the current loop, and the end of the current loop wire is connected to the end wire of the pure copper plate.

[0017] The present invention has the following beneficial effects:

[0018] Convenient replacement of resistors: The device is designed with a resistor replacement module, allowing users to easily replace resistor elements to adapt to different experimental needs. This feature not only improves the flexibility of the experiment, but also reduces the complexity and time cost of replacing resistors.

[0019] Improve experimental flexibility and accuracy: The device can easily adapt to the needs of power signal acquisition of different voltage or current levels by designing an adjustable signal ratio, which improves the flexibility of the experiment. The high-precision sensor group and control module ensure the precise conditioning and processing of the collected signals, thereby improving the accuracy of the experiment.

[0020] Enhanced user interaction experience: The design of the interaction layer fully considers the user's usage needs, and provides users with an intuitive and convenient operation interface through components such as labels, switches, value tables, and interactive modules. Users can input information through the keyboard, convert the effective value of the signal collected by the sensor, and display the effective value of the signal of the current loop or the effective value converted to the primary side signal in real time on the value table. This design not only improves the user's work efficiency, but also reduces the difficulty of operation.

[0021] Improve the safety and reliability of the device: Reasonable electrical connection and signal transmission methods ensure stable operation between components. Safety measures such as ground wire, voltage loop and current loop effectively prevent electrical failure and short circuit.

[0022] Easy maintenance and upgrade: Reasonable shell design and modular components make it easy for users to perform maintenance and upgrade operations. Users can add or replace other functional modules as needed to expand the function and application scope of the device.

[0023] Reduce experimental costs: By designing adjustable signal ratios and replaceable resistor components, the device can collect and analyze a variety of signals, avoiding the additional costs of replacing different acquisition devices. High-precision components and efficient experimental processes reduce the overall cost of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front structural diagram of the electric power experiment signal acquisition device with adjustable signal transformation ratio of the present invention;

[0025] Figure 2 The electrical layer structure diagram of the electric power experiment signal acquisition device with adjustable signal transformation ratio of the present invention;

[0026] Figure 3 This is a control layer structure diagram of the electric power experiment signal acquisition device with adjustable signal transformation ratio according to the present invention;

[0027] Figure 4 It is an interactive layer structure diagram of the electric power experiment signal acquisition device with adjustable signal transformation ratio of the present invention;

[0028] Figure 5 This is a structural diagram of the housing of the electric power experiment signal acquisition device with adjustable signal transformation ratio according to the present invention;

[0029] Figure 6 It is a left side view of the voltage loop of the electric power experiment signal acquisition device with adjustable signal transformation ratio of the present invention;

[0030] Figure 7 It is a left side view of the current loop of the electric power experiment signal acquisition device with adjustable signal transformation ratio of the present invention;

[0031] Figure 8 A switch schematic diagram of the power experiment signal acquisition device with adjustable signal transformation ratio according to the present invention;

[0032] Fig. 9 The thick film resistor and the metal film resistor structure diagram of the power experiment signal acquisition device with adjustable signal ratio of the present invention;

[0033] Fig.10 This is a structural diagram of a resistance replacement module of an electric power experiment signal acquisition device with adjustable signal transformation ratio according to the present invention;

[0034] Fig.11 It is a left side view of the resistance replacement module of the electric power experiment signal acquisition device with adjustable signal transformation ratio of the present invention;

[0035] Fig.12 This is a structural diagram of the pin holder of the electric power experiment signal acquisition device with adjustable signal transformation ratio of the present invention.

[0036] The reference numerals shown in the figure represent respectively: 1-electrical layer, 11-ground wire, 12-voltage loop wire, 13-current loop wire, 2-control layer, 21-sensor group, 22-control module, 221-power module, 222-signal conditioning circuit, 223-microcontroller, 224-keyboard control chip, 3-interaction layer, 31-label, 32-switch, 321-voltage loop switch, 322-current loop switch, 33-value table, 34-interaction module, 341-screen, 342-keyboard, 35-resistance replacement Module, 351-base plate, 3511-hole, 3512-bolt, 352-fixer, 3521-pillar, 3522-baffle, 3523-pure copper plate, 3524-fixing screw, 3525-wire, 3526-opening, 353-upper cover, 354-thick film resistor, 355-metal film resistor, 4-housing, 41-terminal block, 411-screw, 412-signal wire, 42-screw column, 421-nut, 43-pure copper terminal, 44-power socket, 5-voltage loop, 6-current loop. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] Please refer to Figure 1 The present invention relates to a power experiment signal acquisition device with adjustable signal ratio, aiming to provide a device that can flexibly adjust the signal ratio and facilitate experimenters to conduct power experiments. The following is a detailed description of the specific implementation of the present invention.

[0039] Please refer to Figure 2-4 First, the power experiment signal acquisition device of the present invention is structurally divided into an electrical layer 1, a control layer 2 and an interaction layer 3. The three layers are stacked from bottom to top and encapsulated in a housing 4. The electrical layer 1 is the basis of the device, including a ground wire 11, a voltage loop conductor 12 and a current loop conductor 13, which are connected in parallel to form a signal transmission path. The ground wire 11 provides a zero potential reference, the voltage loop conductor 12 transmits a voltage signal, and the current loop conductor 13 transmits a current signal.

[0040] Please refer to Figure 2, the wires in the electrical layer 1 are connected to external devices through the wiring terminal 41. The wiring terminal 41 is fixed to the upper end of the housing 4, which is convenient for accessing the signal wires on the secondary side of the transformer. The voltage loop wire 12 and the current loop wire 13 are connected to the secondary sides of the voltage transformer and the current transformer respectively through the wiring terminal 41. At the same time, the ground wire 11 is connected to the electrical layer 1 through the ground wire screw column 42 to provide grounding protection for the entire device.

[0041] At the bottom of the electrical layer 1, there are pure copper terminals 43, which are fixed to the lower end of the housing 4. The pure copper terminals 43 are used to connect to the signal lines of external devices such as fault recorders to collect voltage signals. Each voltage loop is allocated one wiring terminal 41, and each current loop is allocated two wiring terminals 41 to respectively access voltage and current signals.

[0042] Please refer to Figure 3 The control layer 2 is located above the electrical layer 1 and includes a sensor group 21 and a control module 22. The sensor group 21 includes a plurality of sensors for detecting the voltage value between the voltage loop conductor 12 and the ground wire 11, and the current value in the current loop 6. The sensor group 21 is in communication connection with the control module 22, and transmits the collected signals to the control module 22 for processing.

[0043] The control module 22 is the core component of the device, including a power module 221, a signal conditioning circuit 222, a microcontroller 223 and a keyboard control chip 224. The power module 221 provides power support for the entire device, including the signal conditioning circuit 222, the microcontroller 223, the keyboard control chip 224, the sensor group 21, the switch 32, the numerical table 33, the screen 341, the keyboard 342 and other components. The signal conditioning circuit 222 pre-processes the signal collected by the sensor group 21 to improve the accuracy and stability of the signal.

[0044] The microcontroller 223 is the brain of the control module 22, and is responsible for receiving, processing and analyzing the signals collected by the sensor group 21. At the same time, the microcontroller 223 is also responsible for controlling the display and operation of the numerical table 33, the switch 32 and the screen 341. The keyboard control chip 224 is responsible for processing the information typed by the keyboard 342 and transmitting it to the microcontroller 223 for processing.

[0045] Please refer to Figure 4 The interaction layer 3 is located at the top layer of the device and is the interface for the experimenter to interact with the device. The interaction layer 3 includes multiple tags 31, switches 32, value tables 33, interaction modules 34 and resistance replacement modules 35. Tags 31 are used to identify different circuits, which is convenient for experimenters to identify and operate. Switches 32 are connected in series in the voltage loop conductor 12 and the current loop conductor 13 of the electrical layer 1 to control the connection and disconnection of the circuit.

[0046] The numerical table 33 is connected to the control module 22 of the control layer 2 and is used to display the voltage or current value of the current loop. The experimenter can understand the signal status of the loop by observing the values ​​on the numerical table 33. The interactive module 34 includes a screen 341 and a keyboard 342. The screen 341 is used to display the operation process and prompt information to help the experimenter understand the working status and operation steps of the device. The keyboard 342 is used to enter the experimental parameters and instructions to control the working status of the device.

[0047] Please refer to Figure 10-12 The resistor replacement module 35 is an important innovation of the present invention. It includes a bottom plate 351, a pin holder 352, an upper cover 353 and a thick film resistor 354. The bottom plate 351 is fixed on the housing 4, and the pin holder 352 is installed on the bottom plate 351. There are two pillars 3521 under the pin holder 352, and the backs of the two pillars 3521 are fixed on the same baffle 3522. The pillars 3521 pass through the holes 3511 on the bottom plate 351, so that the pin holder 352 can move left and right to adapt to resistors of different sizes.

[0048] Two pure copper plates 3523 are placed one above the other inside the pin holder 352, and there are fixing screws 3524 on the pure copper plates 3523. After the pins of the thick film resistor 354 are placed in the pin holder 352, the pins are fixed on the pure copper plates 3523 by the pressure applied by the fixing screws 3524. The ends of the pure copper plates 3523 are connected to the current loop wire 13 through the welded wire 3525, so that the resistor is connected to the current loop. Long openings 3526 are provided on both sides of the outer shell of the pin holder 352, which can be used to fix the pins of the metal film resistor 355. After the resistor is replaced, the transparent upper cover 353 can be covered to protect the resistor and the pin holder 352.

[0049] In the specific implementation process, the experimenter can select a suitable thick film resistor 354 according to the experimental needs and install it in the resistor replacement module 35. By adjusting the resistance value of the resistor, the signal ratio in the current loop can be changed, thereby realizing flexible adjustment of the signal.

[0050] Please refer to Figure 6-7 In addition, the present invention also provides a specific implementation of the voltage loop 5 and the current loop 6. The voltage loop 5 includes a terminal 41, a label 31, a switch 32, a numerical table 33, a pure copper terminal 43 and a voltage loop wire 12. The secondary side signal line of the voltage transformer is connected to the voltage loop 5 through the terminal 41, and the terminal 41 and the pure copper terminal 43 are connected through the voltage loop wire 12. The voltage loop switch 321 is connected in series in the voltage loop 5 to control the connection and disconnection of the voltage loop. The sensor group 21 detects the voltage value between the voltage loop wire 12 and the ground wire 11, and transmits the signal to the control module 22 for processing.

[0051] The current loop 6 includes a terminal 41, a label 31, a switch 32, a numerical table 33, a resistor replacement module 35, a pure copper terminal 43 and a current loop wire 13. The secondary side signal line of the current transformer is connected to the current loop 6 through the terminal 41, and the terminal 41 and the pure copper terminal 43 are connected through the current loop wire 13. The current loop switch 322 is connected in series in the current loop 6 to control the connection and disconnection of the current loop. The sensor group 21 detects the current value in the current loop 6 and transmits the signal to the control module 22 for processing. At the same time, the end of the current loop wire 13 is connected to the end wire 3525 of the pure copper plate 3523 to connect the resistor to the current loop.

[0052] During the use of the device, the experimenter can understand the signal status of the current loop by observing the values ​​on the value table 33. At the same time, the experimenter can also enter the experimental parameters and instructions through the keyboard 342 of the interactive module 34 to adjust the working state of the device. For example, the experimenter can enter the multiple of a certain loop through the keyboard 342 to make the values ​​displayed on the value table 33 the real voltage and current values ​​of the primary side of the transformer.

[0053] In addition, the present invention also takes into account the safety of the experimenter and the protection of the equipment. When the device is not powered on, all switches 32 are in the off state. After the device is powered on, the experimenter can manually operate the switch 32 to connect or disconnect the circuit as needed. At the same time, the device is also provided with an indicator light for indicating the on and off state of the switch 32. When the indicator light is green, it means that the circuit is connected; when the indicator light is red, it means that the circuit is disconnected.

[0054] Please refer to Figure 8 In the shutdown state, the present invention defaults to short-circuiting the current loop and disconnecting the voltage loop to protect the safety of the experimenter. When the current loop switch 322 is disconnected, the two current loop wires 13 are short-circuited to prevent damage to the device caused by excessive current. When the voltage loop switch 321 is disconnected, the single voltage loop wire 12 is disconnected to prevent damage to the device caused by excessive voltage.

[0055] The power experiment signal acquisition device of the present invention integrates multiple signal lines into one device, which is more convenient and simple to operate. At the same time, through the design of the resistance replacement module 35 and the interaction module 34, flexible adjustment and intelligent control of the signal are achieved. This enables the experimenter to conduct the power experiment more accurately, improving the efficiency and accuracy of the experiment.

[0056] In the specific implementation process, the experimenters can follow the steps below:

[0057] First, insert the high-potential signal wire on the secondary side of the voltage transformer into the wiring terminal 41 of the voltage loop 5, and fix the wire with the screw 411. Then, insert the two signal wires on the secondary side of the current transformer into the two wiring terminals 41 of the current loop 6, respectively, and fix the wires with the fixing screws 411.

[0058] Next, the grounding wire is fixed to the screw column 42 through the nut 421 to provide grounding protection for the entire device. Then, a suitable thick film resistor 354 is selected according to the experimental needs and installed in the resistor replacement module 35. After the transparent protective cover is covered, the power is turned on and the device automatically turns on.

[0059] After the device is turned on, the experimenter can view the operation process and prompt information through the screen 341 of the interactive module 34. Then, click the switch 32 of the circuit to be used. When the indicator light is green, it means that the circuit is connected. At this time, the experimenter can understand the signal status of the current circuit by observing the value on the value table 33.

[0060] If the signal of a certain loop needs to be adjusted, the experimenter can enter the adjustment parameters through the keyboard 342 of the interactive module 34. For example, the multiple of adjusting a certain loop can be entered so that the values ​​displayed on the value table 33 are the real voltage and current values ​​of the primary side of the transformer. In this way, the experimenter can conduct power experiments more accurately and obtain the required experimental data.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power experiment signal acquisition device with adjustable signal transformation ratio, characterized in that: include: An electrical layer (1) is arranged at the bottom of the device, a control layer (2) is arranged in the middle of the device, and an interaction layer (3) is arranged at the top of the device, and the device is packaged by a shell (4); the electrical layer (1) includes a ground wire (11), a voltage loop conductor (12), and a current loop conductor (13); The interactive layer (3) is provided with a resistor replacement module (35), the resistor replacement module (35) comprising a base plate (351), a pin holder (352) and a thick film resistor (354), the base plate (351) being fixed on the housing (4), the pins of the thick film resistor (354) being placed in the pin holder (352), and the thick film resistor (354) being fixed by pressure applied by a fixing screw (3524), and the end of the pure copper plate (3523) in the pin holder (352) being connected to the current loop wire (13) by a welded wire (3525).

2. The power experiment signal acquisition device with adjustable signal ratio according to claim 1 is characterized in that: The control layer (2) comprises a sensor group (21) and a control module (22), and the sensor group (21) and the control module (22) are communicatively connected.

3. The power experiment signal acquisition device with adjustable signal ratio according to claim 2 is characterized in that: The interactive layer (3) comprises a label (31) and a switch (32); the label (31) is connected to the control module (22) for communication, and content is typed into the label (31) via a keyboard (342); the switch (32) comprises a voltage loop switch (321) and a current loop switch (322); the switch (32) is connected in series to a voltage loop conductor (12) and a current loop conductor (13) of the electrical layer (1) to control the connection and disconnection of the loop; when the voltage loop switch (321) is disconnected, a single voltage loop conductor (12) is disconnected, and when the current loop switch (322) is disconnected, two current loop conductors (13) are short-circuited.

4. The power experiment signal acquisition device with adjustable signal transformation ratio according to claim 3 is characterized in that: The interaction layer (3) further comprises a numerical table (33), wherein the numerical table (33) is connected to the control module (22) of the control layer (2), and the numerical table (33) is used to display voltage or current values.

5. The power experiment signal acquisition device with adjustable signal transformation ratio according to claim 4 is characterized in that: The interaction layer (3) further comprises an interaction module (34), wherein the interaction module (34) comprises a screen (341) and a keyboard (342), wherein the screen (341) is used to display an operation process, and information entered via the keyboard (342) is used to convert the effective value of the secondary side signal of the mutual inductor collected by the sensor group (21) into the effective value of the primary side, and the effective value of the signal of the current loop or the effective value converted to the primary side signal is displayed via the value table (33).

6. The power experiment signal acquisition device with adjustable signal transformation ratio according to claim 5 is characterized in that: The control module (22) comprises a power module (221), a signal conditioning circuit (222), a microcontroller (223) and a keyboard control chip (224); the power module (221) supplies power to the signal conditioning circuit (222), the microcontroller (223), the keyboard control chip (224), the sensor group (21), the switch (32), the numerical table (33) and the interactive module (34); the sensor group (21) transmits the collected voltage and current signals to the microcontroller (223) through the signal conditioning circuit (222); the information typed on the keyboard (342) is transmitted to the keyboard control chip (224) for processing and then transmitted to the microcontroller (223); the microcontroller (223) controls the numerical table (33), the switch (32) and the screen (341).

7. The power experiment signal acquisition device with adjustable signal transformation ratio according to claim 1 is characterized in that: The upper end of the housing (4) is provided with a connection terminal (41) and a grounding screw column (42), the lower end is provided with a pure copper terminal (43), and the left side is provided with a power socket (44); the connection terminal (41) is connected to the pure copper terminal (43) of the electrical layer (1) through a voltage loop conductor (12) and a current loop conductor (13), and the grounding screw column (42) is connected to the electrical layer (1) through a ground wire (11).

8. The power experiment signal acquisition device with adjustable signal transformation ratio according to claim 1 is characterized in that: There are two pillars (3521) below the pin holder (352), the backs of the two pillars (3521) are fixed to the same baffle (3522), the pillars (3521) pass through the holes (3511) and are fixed to the bottom plate (351), the pin holder (352) can move left and right, and there are long openings (3526) on both sides of the outer shell of the pin holder (352), which can be used to fix the pins of the metal film resistor (355).

9. The power experiment signal acquisition device with adjustable signal transformation ratio according to claim 6, characterized in that: The invention also comprises a voltage loop (5), wherein the voltage loop (5) comprises a wiring terminal (41), a label (31), a switch (32), a numerical table (33), a pure copper terminal (43) and a voltage loop conductor (12), wherein the wiring terminal (41) is connected to a secondary side signal line of a voltage transformer, the wiring terminal (41) and the pure copper terminal (43) are connected via the voltage loop conductor (12), the voltage loop switch (321) is connected in series in the voltage loop (5), and the sensor group (21) detects a voltage value between the voltage loop conductor (12) and a ground wire (11).

10. The power experiment signal acquisition device with adjustable signal transformation ratio according to claim 6, characterized in that: The device also comprises a current loop (6), wherein the current loop (6) comprises a wiring terminal (41), a label (31), a switch (32), a numerical table (33), a resistance replacement module (35), a pure copper terminal (43) and a current loop wire (13), wherein the wiring terminal (41) is connected to a secondary side signal line of a current transformer, the wiring terminal (41) and the pure copper terminal (43) are connected via a current loop wire (13), the current loop switch (322) is connected in series in the current loop (6), the sensor group (21) detects a current value in the current loop (6), and the end of the current loop wire (13) is connected to an end wire (3525) of a pure copper plate (3523).

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