High-voltage live display locking device

Abstract

The utility model discloses a high-voltage live display locking device, which comprises a sensor module, and a sensor module, an interface circuit module, an impedance conversion module, a control module, a sensor matching module, a measuring range adjusting module and an output module which are integrated in a case. The device is reliable in structure, a circuit is simplified through cooperation of all the modules, the device can adapt to sensors of various specifications, the control module can be automatically switched according to the state of the connected sensor, and debugging work for adapting to different sensors is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of high voltage technology, specifically to a high voltage live display interlocking device. Background Technology

[0002] In the power industry, when closing grounding switches on the line side of substations above 35kV, safety accidents may occur if the relevant lines are not checked for energization before the operation. Therefore, checking the line for energization before closing the grounding switch is crucial to prevent such accidents. To prevent accidental entry into energized areas and accidental closing of grounding switches (hanging grounding wires), incorporating line energization testing into the computerized five-prevention operation process—checking the line for energization using a high-voltage energization indicator device before closing the grounding switch—can effectively increase operational safety and prevent accidents.

[0003] With the development of electronic technology, inductive high-voltage live display devices have emerged. The principle of this device is to set an electrode in the alternating electric field around the AC live body. Due to the effect of electrostatic capacitance, an induced charge will appear. Then, based on this induced charge, a corresponding circuit is designed to amplify the AC signal, rectify it, and compare it with a reference to detect whether the live body is charged or the level of its potential. The significant feature of this device is that it does not contact the busbar and is installed at a safe distance. However, its circuit is complex and cannot be universally applied to different types of sensors, resulting in its applicability only to sensors with specific structures, a small range of applications, and low versatility. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a high-voltage live display interlocking device.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A high-voltage live display interlocking device, comprising:

[0006] The sensor module is used to acquire the voltage / electric field signals of the high-voltage line and output analog signals related to the energized state of the line under test.

[0007] The interface circuit module communicates with the sensor module and is used to filter and limit the analog signals transmitted by the sensor module.

[0008] Impedance transformation module, which is communicatively connected to interface circuit module, is used to receive the analog signal after filtering and limiting by interface circuit module, and to convert the high impedance signal of interface circuit module into a low impedance signal for adaptation processing.

[0009] The control module is connected in communication with the impedance transformation module to perform analog-to-digital conversion on low-impedance analog signals and separate their DC and AC components.

[0010] The sensor matching module has a switchable first impedance unit. The sensor matching module is communicatively connected to the control module. The DC component of the control module dynamically controls the impedance value of the first impedance unit to adapt to the output impedance of different sensor types.

[0011] The range adjustment module has a switchable second impedance unit. The range adjustment module is communicatively connected to the control module. The AC component of the control module dynamically controls the impedance value of the second impedance unit to adjust the dynamic range of the signal amplitude.

[0012] The output module communicates with the control module and executes local warnings and dry contact signal outputs based on the judgment results of the control module.

[0013] Furthermore, the first impedance unit includes a first switch and multiple load resistors connected in parallel with different resistance values. The control module controls the first switch to connect or disconnect the load resistors with corresponding resistance values ​​to match the corresponding sensor modules.

[0014] Furthermore, the second impedance unit includes a second switch and multiple load resistors connected in parallel with different resistance values. The control module controls the second switch to connect or disconnect the load resistors with corresponding resistance values ​​to adjust the signal amplitude.

[0015] Furthermore, the impedance transformation module is a high-impedance input, low-impedance output circuit composed of operational amplifiers.

[0016] Furthermore, the output module includes a buzzer, indicator light, voice module, and relay, which are respectively connected to the control module in communication. The relay outputs dry contact signals to the downstream devices.

[0017] Furthermore, it also includes a power module, which is used to supply power to the various components.

[0018] Furthermore, it also includes a communication interface and buttons, which are respectively connected to the control module for online program updates. The communication interface is used to set the operating parameters and status selection.

[0019] Furthermore, the interface circuit module, impedance transformation module, control module, sensor matching module, range adjustment module, and output module are all integrated inside the chassis, and the sensor module is connected to the chassis via terminals.

[0020] Furthermore, the control module uses a Cortex-M4 microcontroller.

[0021] The present invention has the following advantages: The high-voltage live display interlocking device provided by the present invention has a reliable structure, simplifies the circuit through the cooperation of various modules, and can adapt to various specifications of sensors. The control module can automatically switch according to the status of the connected sensor, effectively reducing the debugging work to adapt to different sensors. Attached Figure Description

[0022] Figure 1 This is a structural block diagram of the present utility model;

[0023] Figure 2 This is a block diagram showing the specific structure of the sensor matching module and the range adjustment module in this utility model;

[0024] Figures 1 to 2 The reference numerals in the attached figures represent: 1-sensor module, 2-interface circuit module, 3-impedance transformation module, 4-control module, 5-sensor matching module, 6-range adjustment module, 7-output module, 8-first switch, 9-load resistor, 10-second switch, 11-buzzer, 12-indicator light, 13-voice module, 14-relay, 15-power module, 16-communication interface, 17-button. Detailed Implementation

[0025] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0026] like Figures 1 to 2 As shown, a high-voltage live display interlocking device includes a sensor module 1 and a sensor module 1 integrated in a chassis, an interface circuit module 2, an impedance transformation module 3, a control module 4, a sensor matching module 5, a range adjustment module 6, and an output module 7.

[0027] Sensor module 1 is used to acquire the voltage / electric field signal of the high-voltage line and output an analog signal related to the energized state of the tested line. The analog signal includes DC and AC components. The DC component reflects the sensor's operating state and environmental interference, while the AC component reflects the actual energized voltage of the high-voltage line. Furthermore, sensor module 1 can be selected from various specifications of electrostatic capacitive sensors, capacitive voltage divider sensors, or electromagnetic induction sensors. Sensor module 1 is installed near the high-voltage line and located outside the chassis, connecting to the interface circuit module 2 inside the chassis via terminals.

[0028] Interface circuit module 2 is communicatively connected to sensor module 1. Interface circuit module 2 is used to filter, limit, and provide overvoltage protection for the analog signal transmitted by sensor module 1, limiting the maximum voltage entering the subsequent circuit. The processed analog signal is then sent to impedance transformation module 3. Interface circuit module 2 can use a low-pass filter.

[0029] Impedance transformation module 3 is communicatively connected to interface circuit module 2. It receives the filtered and limited analog signal from interface circuit module 2 and converts the high-impedance signal from interface circuit module 2 into a low-impedance signal for adaptation, preventing signal attenuation during transmission. Impedance transformation module 3 is a high-impedance input, low-impedance output circuit composed of operational amplifiers. Impedance transformation module 3 converts the high-impedance signal from interface circuit module 2 into a low-impedance signal and sends it to the analog-to-digital conversion pin of control module 4.

[0030] Control module 4 communicates with impedance transformation module 3, performing analog-to-digital conversion on low-impedance analog signals and separating their DC and AC components. Control module 4 uses a Cortex-M4 microcontroller. The analog-to-digital conversion module of control module 4 converts the analog signal into a digital signal that control module 4 can recognize. After processing, a stable sensor signal is obtained, which is then compared with the set parameters to determine whether the measured high-voltage line is energized. The result is then displayed locally through output module 7 (buzzer 11), indicator light 12, and voice module 13, and relay 14 outputs a dry contact signal to the downstream equipment.

[0031] The sensor matching module 5 has a switchable first impedance unit. The sensor matching module 5 is communicatively connected to the control module 4. The DC component of the control module 4 dynamically controls the impedance value of the first impedance unit to adapt to the output impedance of different sensor types. The first impedance unit includes a first switch 8 and multiple parallel load resistors 9 with different resistance values. The control module 4 controls the first switch 8 to connect or disconnect the load resistor 9 with the corresponding resistance value to match the corresponding sensor module 1. The load resistor 9 can serve as the sensor load or be used to detect the sensor's connection status. The control module 4 controls the first switch S1 of the sensor matching module 5 to connect or disconnect the load resistor 9 according to the magnitude of the DC voltage in the obtained signal to adapt to the connected sensor, thereby accommodating different signal strengths from sensors of different specifications. The control module 4 acquires signals through an ADC to determine the sensor's operating status. If the DC voltage is too high, it indicates that the sensor is overloaded. The control module 4 controls the first switch 8 to connect a load resistor 9 with a smaller resistance value to reduce the load effect. If the DC voltage is too low, it indicates that the sensor may be disconnected. All load resistors 9 are disconnected, and a fault alarm is triggered. This allows for the adaptation to various types of sensors by switching parallel load resistors 9 with different resistance values.

[0032] The range adjustment module 6 has a switchable second impedance unit. The range adjustment module 6 is communicatively connected to the control module 4. The AC component of the control module 4 dynamically controls the impedance value of the second impedance unit to adjust the dynamic range of the signal amplitude. The second impedance unit includes a second switch 10 and multiple load resistors 9 connected in parallel with different resistance values. The control module 4 controls the second switch 10 to connect or disconnect the load resistor 9 with the corresponding resistance value to adjust the signal amplitude. The load resistor 9 connected to the second switch 10 is the sensor load. The control module 4 controls the second switch S2 of the range adjustment module 6 to connect or disconnect an appropriate resistor based on the magnitude of the AC voltage in the obtained signal to adjust the signal amplitude and adapt to different voltage ranges. The control module 4 calculates the effective value (RMS) or peak-to-peak value of the AC signal, determines whether the current signal exceeds the range, and controls the adjustment by switching the second switch 10 between load resistors 9 with different resistance values.

[0033] Output module 7 is communicatively connected to control module 4 and executes local alarms and dry contact signal outputs based on the judgment result of control module 4. Output module 7 includes a buzzer 11, an indicator light 12, a voice module 13, and a relay 14, all communicatively connected to control module 4. Buzzer 11 is a piezoelectric alarm, indicator light 12 uses red and green LEDs, and voice module 13 pre-stores the content to be broadcast in a voice chip, triggering the corresponding content to be played when needed. Buzzer 11, indicator light 12, and voice module 13 are used for local alarms and status indications. Relay 12 is a dry contact output for detecting the presence or absence of electrical signals.

[0034] In addition, the device also includes a power module 15, a communication interface 16, and a button 17. The power module 15 is used to supply power to the various components. The communication interface and the button 17 are respectively connected to the control module 4. The device can be updated online through the communication interface 16, and the operating parameters and status selection can be set through the button 17.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high voltage live display lockout device, characterised in that, include: The sensor module (1) is used to acquire the voltage / electric field signal of the high-voltage line and output an analog signal related to the energized state of the line under test. Interface circuit module (2), which is communicatively connected to the sensor module (1), is used to filter and limit the analog signal transmitted by the sensor module (1); Impedance transformation module (3), which is communicatively connected to the interface circuit module (2), is used to receive the analog signal after filtering and limiting by the interface circuit module (2) and convert the high impedance signal of the interface circuit module (2) into a low impedance signal for adaptation processing. The control module (4) is communicatively connected to the impedance transformation module (3) to perform analog-to-digital conversion on the low-impedance analog signal and separate its DC component and AC component. The sensor matching module (5) has a switchable first impedance unit. The sensor matching module (5) is communicatively connected to the control module (4). The DC component of the control module (4) dynamically controls the impedance value of the first impedance unit to adapt to the output impedance of different sensor types. The range adjustment module (6) has a switchable second impedance unit. The range adjustment module (6) is communicatively connected to the control module (4). The AC component of the control module (4) dynamically controls the impedance value of the second impedance unit to adjust the dynamic range of the signal amplitude. The output module (7) is communicatively connected to the control module (4) and performs local warning and dry contact signal output according to the judgment result of the control module (4).

2. The high voltage live display lockout device of claim 1, wherein, The first impedance unit includes a first switch (8) and multiple load resistors (9) connected in parallel with different resistance values. The control module (4) controls the first switch (8) to connect or disconnect the load resistor (9) with the corresponding resistance value to match the corresponding sensor module (1).

3. The high voltage live display lockout device of claim 2, wherein, The second impedance unit includes a second switch (10) and multiple load resistors (9) connected in parallel with different resistance values. The control module (4) controls the second switch (10) to connect or disconnect the load resistors (9) with corresponding resistance values ​​to adjust the signal amplitude.

4. The high voltage live display lockout device of claim 1, wherein, The impedance transformation module (3) is a high-impedance input and low-impedance output circuit composed of an operational amplifier.

5. The high voltage live display lockout device of claim 1, wherein, The output module (7) includes a buzzer (11), an indicator light (12), a voice module (13), and a relay (14) that are respectively connected to the control module (4). The relay (14) outputs a dry contact signal to the downstream device.

6. The high voltage live display lockout device of claim 1, wherein, It also includes a power module (15) for supplying power to the various components.

7. The high voltage live display lockout device of claim 1, wherein, It also includes a communication interface (16) and a button (17), which are respectively connected to the control module (4). The communication interface (16) is used to update the device online, and the button (17) is used to set the working parameters and status selection.

8. The high voltage live display lockout device of claim 1, wherein, The interface circuit module (2), impedance transformation module (3), control module (4), sensor matching module (5), range adjustment module (6) and output module (7) are all integrated in the chassis, and the sensor module (1) is connected to the chassis through a terminal.

9. The high voltage live display lockout device of claim 1, wherein, The control module (4) uses a Cortex-M4 microcontroller.

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