Portable potential monitoring method and device

Abstract

The invention discloses a portable potential monitoring method and device, and relates to the technical field of potential monitoring, and the method comprises the following steps: after a manual operation node is closed, a potential monitoring loop is started; when a positive potential appears at a monitoring point, a signal is amplified through a multi-stage amplification loop, a first relay of a driving and maintaining loop is electrified, a normally open node is closed, then a second relay is electrified, a light emitting diode is lightened, the normally open node of a position node loop is closed, and a normally closed node is opened; after the positive potential disappears, the first relay loses power, the second relay and the normally open node of the second relay form self-holding, the light-emitting diode is kept on, and the state of the position node is not changed; when the reset loop button is pressed down, the second relay loses power, the light emitting diode is extinguished, and the position node loop recovers to the initial state. After the button is released, the system keeps the state. The reset function is designed, the whole detection loop can be reset to the original state, and when no positive potential signal exists, the light-emitting diode can recover to the light-off state.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a portable potential monitoring method and device. Background Technology

[0002] During substation operation, the following situations are commonly encountered: When the circuit breaker's protection device operates, a short-term potential change occurs at the circuit breaker control circuit output. During the acceptance testing of protection equipment, to prevent repeated circuit breaker operation from reducing mechanical life, the potential change at the circuit breaker control circuit output can be monitored to determine the correctness of the protection logic operation. When the protection or measurement control device of high-voltage equipment needs to be modified, there may be situations where some high-voltage facilities are prohibited from operation. In this case, the control circuit output of the relevant high-voltage equipment can be disconnected, and the potential change at the output can be monitored to verify the correctness of the modification required for the protection or measurement control device.

[0003] The disclosed technical solutions described above have at least the following technical problems: Currently, it is difficult to monitor the brief positive potential signal at the control loop outlet. To address these problems, this invention proposes a solution. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a portable potential monitoring method and device, which can be used for potential monitoring when the positive potential signal is very short-lived, and solves the problem that it is difficult to monitor short-lived positive potential signals in special situations.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A portable potential monitoring method includes the following steps: closing the manual operation node of the reset loop, the potential monitoring loop starts working; when a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit, and the amplified signal drives the first relay of the holding loop to energize, causing the corresponding normally open node to close; after the first relay of the holding loop is energized, the second relay of the holding loop is energized, the corresponding normally open node closes, at this time the LED lights up, the normally open node of the position node loop closes, and the normally closed node opens, recording the appearance of the positive potential; when the positive potential at the monitoring point disappears, the amplification circuit is de-energized, the first relay of the holding loop is de-energized, the second relay of the holding loop and the corresponding normally open node form a self-holding loop, the LED remains constantly lit, the normally open node of the position node loop remains closed, and the normally closed node remains open; pressing the normally closed button of the reset loop de-energizes the second relay of the holding loop, the corresponding normally open node opens, the LED turns off, the normally open node of the position node loop opens, and the normally closed node closes; releasing the normally closed button, the second relay of the holding loop is still de-energized, and the monitoring loop returns to its initial state.

[0006] In a preferred embodiment, the multi-stage amplification circuit includes two NPN transistors and a resistor; one end of the resistor is connected to a monitoring point, and the other end is connected to the base of the first NPN transistor; the collector of the first NPN transistor is the first input terminal of the amplification circuit, and the emitter of the first NPN transistor is connected to the base of the second NPN transistor; the collector of the second NPN transistor is the second input terminal of the amplification circuit, and the emitter of the second NPN transistor is the output terminal of the amplification circuit.

[0007] In a preferred embodiment, the holding circuit includes two relays and corresponding normally open terminals, and a light-emitting diode (LED); wherein the positive terminal of the first relay is connected to the positive terminal of the LED, together forming the input terminal of the holding circuit; the negative terminal of the first relay is the first output terminal of the holding circuit, connected to the second input terminal of the amplification circuit; the positive terminal of the second relay is connected to the negative terminal of the LED, and the negative terminal of the second relay is connected to one end of the two normally open terminals; the other ends of the two normally open terminals are connected in parallel, together serving as the second output terminal of the holding circuit.

[0008] In a preferred embodiment, the position node circuit includes a pair of normally open and normally closed nodes and a manually operated node; the pair of normally open and normally closed nodes are driven by a second relay in the holding circuit; the manually operated node is manually controlled.

[0009] In a preferred embodiment, the reset circuit includes a normally closed button, a power supply, and a manual operation node; one end of the normally closed button serves as the reset circuit input, and the other end is connected to the negative terminal of the power supply; the positive terminal of the power supply is connected to one end of the manual operation node; the other end of the manual operation node serves as the reset circuit output. The reset circuit input and the amplification circuit output are connected to the second output of the maintenance circuit; the reset circuit output and the amplification circuit first input are connected to the maintenance circuit input; the reset circuit output is grounded.

[0010] In a preferred embodiment, when a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit. The amplified signal drives the first relay in the holding circuit to energize, causing the corresponding normally open node to close. Specifically, when a positive potential appears at the monitoring point, current flows into the base of the first NPN transistor through a resistor. With the injection of base current, the first NPN transistor begins to conduct, the collector current increases, and the collector voltage decreases. The change in collector voltage is used as the output of the first amplification stage and connected to the base of the second NPN transistor. The second NPN transistor receives the output signal of the first transistor and turns on or off according to the change in the base current of the first transistor, thereby generating a further amplified and adjusted potential signal output at the emitter of the second NPN transistor, which drives the first relay in the holding circuit to energize.

[0011] In a preferred embodiment, when a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit. The amplified signal drives the first relay in the holding circuit to energize, causing the corresponding normally open node to close. Specifically, when a positive potential appears at the monitoring point, current flows into the base of the first NPN transistor through a resistor. With the injection of base current, the first NPN transistor begins to conduct, the collector current increases, and the collector voltage decreases. The change in collector voltage is used as the output of the first amplification stage and connected to the base of the second NPN transistor. The second NPN transistor receives the output signal of the first transistor and turns on or off according to the change in the base current of the first transistor, thereby generating a further amplified and adjusted potential signal output at the emitter of the second NPN transistor, which drives the first relay in the holding circuit to energize.

[0012] In a preferred embodiment, pressing the normally closed reset circuit button de-energizes the second relay in the holding circuit, causing its corresponding normally open node to open and the LED to turn off. Specifically, when the normally closed reset circuit button is pressed, the reset circuit is activated, and current flows from the positive terminal of the power supply, through the manual operation node, and back to the negative terminal of the power supply via the normally closed button. The self-holding circuit of the second relay in the holding circuit is broken, and the second relay loses its current supply and becomes de-energized. After the second relay is de-energized, its corresponding normally open node opens, the LED circuit is cut off, and the LED turns off. The electrical connection between the position node circuit and the holding circuit is restored; the normally open node of the position node circuit opens, and the normally closed node closes again. The entire potential monitoring circuit returns to its initial state when no positive potential is detected, awaiting the next monitoring task or the arrival of a positive potential signal.

[0013] In a preferred embodiment, after the first relay of the holding circuit is energized, the second relay of the holding circuit is energized, and the corresponding normally open node closes. At this time, the LED lights up, the normally open node of the position node circuit closes, and the normally closed node opens, recording the appearance of a positive potential. Specifically, when the first relay of the holding circuit is energized, the normally open node of the first relay closes, forming a new current path. The new current path is as follows: the current starts from the positive terminal of the power supply, flows through the closed normally open node of the first relay to the positive terminal of the second relay of the holding circuit, energizing the second relay. After the second relay is energized, the normally open node corresponding to the second relay closes. In the branch containing the LED, the current forms a loop from the positive terminal of the power supply through the positive terminal of the first relay, the LED, and the closed normally open node between the positive and negative terminals of the second relay. The LED lights up because of the current flowing through it. For the position node circuit, the second relay of the holding circuit is energized and its normally open node is closed, driving the normally open node in the position node circuit to close and the normally closed node to open, recording the state change as a marker of the appearance of a positive potential at the monitoring point.

[0014] A portable potential monitoring device includes: a monitoring point contact, a normally closed contact, a normally open contact, a manual operation contact, a manual operation switch, a reset button, a battery compartment, a power switch, a grounding point, and an indicator light; it also includes a heat dissipation window and a magnetic sheet; the battery compartment is located on the side of the device and houses a battery to power the device; the heat dissipation window is located on the side of the device for heat dissipation; the magnetic sheet is attached to the device so that it can be magnetically attached to a metal cabinet.

[0015] The technical effects and advantages of the portable potential monitoring method and device of the present invention are as follows: 1. This invention can be applied to potential monitoring under conditions of very short-lived positive potential signals, solving the problem of difficulty in monitoring short-lived positive potential signals in special situations. A reset function is designed to return the entire detection circuit to its original state; when there is no positive potential signal, the LED can return to the off state. A pair of normally open and normally closed nodes and a manual operation node are provided. These nodes can be provided to relevant devices to simulate feedback of closing or opening, meeting the potential monitoring function in special situations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a portable potential monitoring method according to the present invention.

[0017] Figure 2 This is a schematic diagram of the potential monitoring circuit of the present invention.

[0018] Figure 3 This is a schematic diagram of the potential monitoring device of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1, Figure 1 The present invention provides a portable potential monitoring method, comprising the following steps: S1, the manual operation node for closing the return loop, the potential monitoring loop starts working; When the manual operation node of the reset loop is closed, current begins to flow in the reset loop. The specific path starts from the positive terminal of the power supply, passes through the manual operation node, and then splits into two paths: one connects to the input terminal of the holding loop (i.e., connected to the positive terminals of the first relay and the LED), and the other connects to the first input terminal of the amplification loop (achieved through connection to the output terminal of the reset loop). At this point, because the circuit is connected, all components are in a ready-to-operate state. In the holding loop, the first and second relays begin initialization due to the current inflow. Although there may not yet be a positive potential signal at the monitoring point, the loop is activated, and all nodes and components are in a standby state, waiting for the appearance of a positive potential at the monitoring point for subsequent signal amplification, holding, and status recording operations. For example, in some substation equipment monitoring scenarios, before conducting relevant equipment tests, personnel close this manual operation node to put the entire potential monitoring loop into a ready-to-operate state. This ensures that if the equipment experiences a brief positive potential change, the monitoring loop can promptly and accurately capture and record the relevant information, providing reliable monitoring assurance for the safe and stable operation of the equipment.

[0021] S2, when a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit. The amplified signal drives the first relay of the holding circuit to be energized, causing the corresponding normally open node to close. The multi-stage amplification circuit includes two NPN transistors 3 and 4, and a resistor 2; one end of the resistor 2 is connected to monitoring point 1, and the other end is connected to the base of the first NPN transistor 3; the collector of the first NPN transistor 3 is the first input terminal of the amplification circuit, and the emitter of the first NPN transistor 3 is connected to the base of the second NPN transistor 4; the collector of the second NPN transistor 4 is the second input terminal of the amplification circuit, and the emitter of the second NPN transistor 4 is the output terminal of the amplification circuit.

[0022] When a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit. The amplified signal drives the first relay in the holding circuit to be energized, causing the corresponding normally open node to close. Specifically: When a positive potential appears at the monitoring point, current flows through the resistor into the base of the first NPN transistor; With the injection of base current, the first NPN transistor begins to conduct, the collector current increases, and the collector voltage decreases. The change in collector voltage is used as the output of the first amplification stage and connected to the base of the second NPN transistor. The second NPN transistor receives the output signal from the first transistor and turns on or off according to the change in the base current of the first transistor, thereby generating a further amplified and adjusted potential signal output at the emitter of the second NPN transistor, which drives the first relay in the holding circuit to be energized.

[0023] For example, assuming the initial positive potential of the monitoring point is a small voltage value, after being amplified by the first NPN transistor, the voltage may be amplified to an intermediate value. After being amplified again by the second NPN transistor, the final output voltage reaches the voltage value required for the first relay of the holding circuit to work normally, thereby closing the corresponding normally open node and realizing a series of chain reactions of subsequent holding circuits and the entire potential monitoring circuit, ensuring the effective monitoring and recording of brief positive potential signals.

[0024] S3, after the first relay of the holding circuit is energized, the second relay of the holding circuit is energized, and the corresponding normally open node is closed. At this time, the LED lights up, the normally open node of the position node circuit is closed, the normally closed node is opened, and the appearance of the positive potential is recorded. The holding circuit includes two relays, corresponding normally open contacts, and a light-emitting diode (LED). The positive terminal of the first relay is connected to the positive terminal of the LED to form the input terminal of the holding circuit. The negative terminal of the first relay is the first output terminal of the holding circuit, which is connected to the second input terminal of the amplification circuit. The positive terminal of the second relay is connected to the negative terminal of the LED, and the negative terminal of the second relay is connected to one end of the two normally open contacts. The other ends of the two normally open contacts are connected in parallel to form the second output terminal of the holding circuit. After the first relay in the holding circuit is energized, the second relay in the holding circuit is energized, and the corresponding normally open node closes. At this time, the LED lights up, the normally open node of the position node circuit closes, and the normally closed node opens. The occurrence of a positive potential is recorded. Specifically: When the first relay in the holding circuit is energized, the normally open contact of the first relay closes, forming a new current path; The new current path is as follows: the current starts from the positive terminal of the power supply, flows through the closed normally open node of the first relay to the positive terminal of the second relay in the holding circuit, and energizes the second relay. When the second relay is energized, the normally open contact corresponding to the second relay closes. In the branch containing the light-emitting diode, the current flows from the positive terminal of the power supply through the positive terminal of the first relay, the light-emitting diode, and the closed normally open node between the positive and negative terminals of the second relay to form a loop. The light-emitting diode lights up because of the current flowing through it. For the position node loop, keep the second relay in the loop energized and its normally open node closed, drive the normally open node in the position node loop to close and the normally closed node to open, record the state change as a sign of the positive potential appearing at the monitoring point.

[0025] For example, in a substation monitoring system, when a positive potential appears at the output of the circuit breaker control circuit, after the operation of multiple amplification circuits and holding circuits, the change in the state of the position node circuit is transmitted to the monitoring system, indicating that the positive potential has been detected. The system can then make subsequent logical judgments or record data to accurately assess and analyze the operating status of the equipment and ensure the safe and stable operation of the substation.

[0026] S4, when the positive potential of the monitoring point disappears, the amplification circuit is not connected, the first relay of the holding circuit is de-energized, the second relay of the holding circuit and the corresponding normally open node form a self-holding circuit, the light-emitting diode remains constantly lit, the normally open node of the position node circuit remains closed, and the normally closed node remains open. The position node circuit includes a pair of normally open and normally closed nodes 15 and 14, and a manual operation node 16; the pair of normally open and normally closed nodes 15 and 14 are driven by the second relay 7 in the holding circuit; the manual operation node 16 is manually controlled.

[0027] When the positive potential at the monitoring point disappears, the amplification circuit is de-energized, the first relay in the holding circuit is de-energized, the second relay in the holding circuit and the corresponding normally open node form a self-holding circuit, the LED remains constantly lit, the normally open node of the position node circuit remains closed, and the normally closed node remains open. Specifically: When the positive potential at the monitoring point disappears, the multi-stage amplification circuit stops working due to the loss of the positive potential input signal. The base current of the first NPN transistor approaches zero, and the collector and emitter of the first transistor are open-circuited. The first relay in the holding circuit loses its driving current and is de-energized. In the holding circuit, when the second relay is energized, the normally open contact corresponding to it is already closed. When the first relay is de-energized, the current can still flow from the positive terminal of the power supply through the normally closed contact of the first relay (returning to the initial closed state), the LED, and the normally open contact of the second relay to form a circuit and continuously supply power to the second relay, keeping the second relay energized and forming a self-holding circuit. The LED remains constantly lit based on the self-holding circuit, continuously indicating to the outside world that a positive potential has appeared at the monitoring point; Due to its electrical connection with the holding circuit, the normally open node of the position node circuit remains closed when the second relay is self-holding energized, while the normally closed node remains open.

[0028] This stable state allows the system to record information about the occurrence of a positive potential even after the positive potential at the monitoring point has disappeared, providing a reliable basis for subsequent analysis of equipment operating status, troubleshooting, and system logic judgment.

[0029] For example, in equipment monitoring applications in substations, even if the positive potential pulse at the circuit breaker control circuit outlet is extremely short, the potential monitoring circuit can accurately record the fact that it has occurred, which is convenient for maintenance personnel to refer to when checking the equipment operation logic or finding potential problems.

[0030] S5, press the normally closed reset circuit button, keep the second relay of the circuit de-energized, the corresponding normally open node opens, the LED turns off, the normally open node of the position node circuit opens, and the normally closed node closes. The reset circuit includes a normally closed button 10, a power supply 11, and a manual operation node 12. One end of the normally closed button 10 serves as the input terminal of the reset circuit, and the other end is connected to the negative terminal of the power supply 11. The positive terminal of the power supply 11 is connected to one end of the manual operation node 12. The other end of the manual operation node 12 serves as the output terminal of the reset circuit. The input terminal of the reset circuit and the output terminal of the amplification circuit are connected to the second output terminal of the reset circuit. The output terminal of the reset circuit and the first input terminal of the amplification circuit are connected to the input terminal of the reset circuit. The output terminal of the reset circuit is grounded.

[0031] When the normally closed reset circuit button is pressed, the second relay in the holding circuit is de-energized, the corresponding normally open contact opens, the LED turns off, the normally open contact of the position node circuit opens, and the normally closed contact closes. Specifically: When the normally closed reset circuit button is pressed, the reset circuit is connected, and the current flows from the positive terminal of the power supply, through the manual operation node, and then back to the negative terminal of the power supply through the normally closed button. The self-holding circuit containing the second relay in the holding circuit is broken, and the second relay loses its current supply and is de-energized. When the second relay loses power, the normally open contact corresponding to the second relay opens, the circuit containing the LED is cut off, and the LED goes out. The position node circuit and the holding circuit are electrically connected. The normally open node of the position node circuit is disconnected, and the normally closed node is restored to closed. The entire potential monitoring loop returns to its initial state when no positive potential was detected, awaiting the next monitoring task or the arrival of a positive potential signal.

[0032] In a self-holding circuit, the current normally flows through the normally closed terminal of the first relay, the LED, and the normally open terminal of the second relay to power the second relay. However, pressing the normally closed button creates a low-resistance path (the path where the normally closed button is located) in parallel with the power supply circuit of the second relay. The current will preferentially flow back to the negative terminal of the power supply from the normally closed button path, thus causing the second relay to lose sufficient current supply and become de-energized.

[0033] For example, after a substation device completes a monitoring cycle or fault diagnosis and repair, pressing the normally closed reset button can reset the monitoring device, enabling subsequent repeated monitoring to be performed. This ensures the repeatability and stability of the monitoring device and provides strong support for the continuous safe operation of the substation equipment.

[0034] S6, release the normally closed button, keep the second relay in the holding circuit de-energized, and the monitoring circuit returns to its initial state.

[0035] Releasing the normally closed button keeps the second relay in the holding circuit de-energized, and the monitoring circuit returns to its initial state, specifically as follows: When the normally closed reset button is released, since the self-holding power supply to the second relay in the holding circuit was cut off when the button was pressed, and there is no new trigger signal to re-energize the second relay, the state of the entire circuit remains unchanged after the button was pressed.

[0036] In the holding circuit, the second relay is in a de-energized state, and the normally open contact corresponding to the second relay remains open; In the position node circuit, the second relay of the holding circuit is not driven, the normally open node remains open, and the normally closed node remains closed; In a multi-stage amplification circuit, since there is no positive potential trigger at the monitoring point, it is also in an initial state of not being conducted. All components and nodes in the entire potential monitoring circuit are restored to their initial state before a positive potential signal was detected, including the state of the relays, the opening and closing states of the nodes, and the current on / off states of each branch, thus completing the entire monitoring and reset process.

[0037] It can achieve cyclic and reliable monitoring of equipment potential in application scenarios such as substations, ensuring the accuracy and continuity of equipment operation status monitoring.

[0038] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0039] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, in the form of a computer program product.

[0040] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0041] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0042] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0043] In conclusion, 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable potential monitoring device, characterized in that, include: Multi-stage amplification circuit: It consists of two NPN transistors and a resistor. One end of the resistor is connected to the monitoring point. The monitoring point signal is processed by the two transistors in sequence and then output as an amplified signal to drive the subsequent circuit. Holding circuit: It includes two relays, corresponding normally open contacts and one light-emitting diode. Under the drive of the amplification circuit, the relays are activated to close the normally open contacts, the light-emitting diode lights up and is maintained in the lit state through the self-holding circuit to record the appearance of positive potential. Position node circuit: It has a pair of normally open and normally closed nodes driven by the second relay of the holding circuit and a manually controlled manual operation node, which can provide analog feedback to the relevant devices for closing or opening. Reset circuit: It consists of a normally closed button, a power supply and a manual operation node. Pressing the button will de-energize the relay in the holding circuit, allowing the entire detection circuit to return to its original state.

2. The portable potential monitoring device according to claim 1, characterized in that, The multi-stage amplification circuit includes two NPN transistors and one resistor; one end of the resistor is connected to the monitoring point, and the other end is connected to the base of the first NPN transistor; the collector of the first NPN transistor is the first input terminal of the amplification circuit, and the emitter of the first NPN transistor is connected to the base of the second NPN transistor; the collector of the second NPN transistor is the second input terminal of the amplification circuit, and the emitter of the second NPN transistor is the output terminal of the amplification circuit.

3. The portable potential monitoring device according to claim 2, characterized in that, The holding circuit includes two relays and corresponding normally open terminals, and a light-emitting diode (LED). The positive terminal of the first relay is connected to the positive terminal of the LED, which together form the input terminal of the holding circuit. The negative terminal of the first relay is the first output terminal of the holding circuit, which is connected to the second input terminal of the amplification circuit. The positive terminal of the second relay is connected to the negative terminal of the LED, and the negative terminal of the second relay is connected to one end of the two normally open terminals. The other ends of the two normally open terminals are connected in parallel, which together serve as the second output terminal of the holding circuit.

4. The portable potential monitoring device according to claim 3, characterized in that, The position node circuit includes a pair of normally open and normally closed nodes and a manual operation node; the pair of normally open and normally closed nodes are driven by a second relay in the holding circuit; the manual operation node is manually controlled.

5. The portable potential monitoring method and device according to claim 4, characterized in that, The reset circuit includes a normally closed button, a power supply, and a manual operation node. One end of the normally closed button serves as the reset circuit input, and the other end is connected to the negative terminal of the power supply. The positive terminal of the power supply is connected to one end of the manual operation node. The other end of the manual operation node serves as the reset circuit output. The reset circuit input and the amplification circuit output are connected to the second output of the reset circuit. The reset circuit output and the amplification circuit input are connected to the reset circuit input. The reset circuit output is grounded.

6. A method for using the portable potential monitoring device as described in claims 1-5, characterized in that, The manual operation node for closing the return loop activates the potential monitoring loop. When a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit. The amplified signal drives the first relay of the holding circuit to be energized, causing the corresponding normally open node to close. After the first relay in the holding circuit is energized, the second relay in the holding circuit is energized, and the corresponding normally open node closes. At this time, the LED lights up, the normally open node of the position node circuit closes, and the normally closed node opens. The occurrence of the positive potential is recorded. When the positive potential at the monitoring point disappears, the amplification circuit is de-energized, the first relay of the holding circuit is de-energized, the second relay of the holding circuit and the corresponding normally open node form a self-holding circuit, the light-emitting diode remains constantly lit, the normally open node of the position node circuit remains closed, and the normally closed node remains open. Pressing the normally closed reset circuit button de-energizes the second relay in the holding circuit, opens the corresponding normally open contact, turns off the LED, opens the normally open contact of the position node circuit, and closes the normally closed contact. Releasing the normally closed button keeps the second relay in the holding circuit de-energized, and the monitoring circuit returns to its initial state. When a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit. The amplified signal drives the first relay in the holding circuit to be energized, causing the corresponding normally open node to close. Specifically: When a positive potential appears at the monitoring point, current flows through the resistor into the base of the first NPN transistor; With the injection of base current, the first NPN transistor begins to conduct, the collector current increases, and the collector voltage decreases. The change in collector voltage is used as the output of the first amplification stage and connected to the base of the second NPN transistor. The second NPN transistor receives the output signal from the first transistor and turns on or off according to the change in the base current of the first transistor, thereby generating a further amplified and adjusted potential signal output at the emitter of the second NPN transistor, which drives the first relay in the holding circuit to be energized.

7. The portable potential monitoring method and device according to claim 6, characterized in that, When a positive potential appears at the monitoring point, the potential signal is amplified through a multi-stage amplification circuit. The amplified signal drives the first relay in the holding circuit to be energized, causing the corresponding normally open node to close. Specifically: When a positive potential appears at the monitoring point, current flows through the resistor into the base of the first NPN transistor; With the injection of base current, the first NPN transistor begins to conduct, the collector current increases, and the collector voltage decreases. The change in collector voltage is used as the output of the first amplification stage and connected to the base of the second NPN transistor. The second NPN transistor receives the output signal from the first transistor and turns on or off according to the change in the base current of the first transistor, thereby generating a further amplified and adjusted potential signal output at the emitter of the second NPN transistor, which drives the first relay in the holding circuit to be energized.

8. The portable potential monitoring method and device according to claim 7, characterized in that, When the normally closed reset circuit button is pressed, the second relay in the holding circuit is de-energized, the corresponding normally open contact opens, the LED turns off, the normally open contact of the position node circuit opens, and the normally closed contact closes. Specifically: When the normally closed reset circuit button is pressed, the reset circuit is connected, and the current flows from the positive terminal of the power supply, through the manual operation node, and then back to the negative terminal of the power supply through the normally closed button. The self-holding circuit containing the second relay in the holding circuit is broken, and the second relay loses its current supply and is de-energized. When the second relay loses power, the normally open contact corresponding to the second relay opens, the circuit containing the LED is cut off, and the LED goes out. The position node circuit and the holding circuit are electrically connected. The normally open node of the position node circuit is disconnected, and the normally closed node is restored to closed. The entire potential monitoring loop returns to its initial state when no positive potential was detected, awaiting the next monitoring task or the arrival of a positive potential signal.

9. The portable potential monitoring method and device according to claim 8, characterized in that, After the first relay in the holding circuit is energized, the second relay in the holding circuit is energized, and the corresponding normally open node closes. At this time, the LED lights up, the normally open node of the position node circuit closes, and the normally closed node opens. The occurrence of a positive potential is recorded. Specifically: When the first relay in the holding circuit is energized, the normally open contact of the first relay closes, forming a new current path; The new current path is as follows: the current starts from the positive terminal of the power supply, flows through the closed normally open node of the first relay to the positive terminal of the second relay in the holding circuit, and energizes the second relay. When the second relay is energized, the normally open contact corresponding to the second relay closes. In the branch containing the light-emitting diode, the current flows from the positive terminal of the power supply through the positive terminal of the first relay, the light-emitting diode, and the closed normally open node between the positive and negative terminals of the second relay to form a loop. The light-emitting diode lights up because of the current flowing through it. For the position node loop, keep the second relay in the loop energized and its normally open node closed, drive the normally open node in the position node loop to close and the normally closed node to open, record the state change as a sign of the positive potential appearing at the monitoring point.

10. An apparatus using the portable potential monitoring method as described in any one of claims 1-9, characterized in that, include: Monitoring point contacts, normally closed contact contacts, normally open contact contacts, manual operation contact contacts, manual operation switch, reset button, battery compartment, power switch, grounding point, indicator light; also includes heat dissipation window and magnetic sheet; The battery compartment is located on the side of the device and houses the battery to power the device. The heat dissipation window is located on the side of the device to dissipate heat. The magnetic sheet is attached to the device, allowing it to adhere to the iron cabinet.

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