Single-phase power line ground insulation strength reduction detection alarm and controller
By employing two sets of leakage signal detection devices and circuit processing units in a single-phase power line, the insulation strength of the line is detected and an alarm is triggered when leakage occurs. This solves the shortcomings of leakage detection in single-phase power lines, enables rapid detection and flexible power supply control, and ensures the safety of urban road lighting.
Patent Information
- Application Number
- CN202522331715.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-10-31
AI Technical Summary
The lack of effective means for detecting leakage current in single-phase power lines in existing technologies has led to frequent leakage current accidents in urban lighting lines, posing a risk of electric shock.
Two sets of leakage current signal detection devices and circuit processing units are used to detect whether there is a decrease in the insulation strength to ground at the two output terminals of a single-phase power line, thereby realizing leakage current detection and alarm functions. The main lamp and auxiliary lamp are operated alternately through flexible power supply control to ensure power supply safety.
It enables rapid detection and alarm of leakage current in single-phase power lines, reduces the risk of electric shock, ensures the safety and reliability of urban road lighting, and avoids darkness.
Smart Images
Figure CN224934136U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit testing technology, specifically to an alarm and controller for detecting the insulation strength to ground of a single-phase power line. Background Technology
[0002] Currently, the power supply lines for road lighting and landscape lighting in my country mostly adopt the "one live wire and one neutral wire" mode of the "three-phase four-wire" power supply. This power supply mode has some drawbacks. The neutral wire of the transformer is always connected to the ground through a deep grounding grid. The ground under a person's feet is the neutral wire of the power supply transformer, which is the main cause of electric shock accidents.
[0003] With the continuous expansion of cities, the scale of urban lighting has developed rapidly. In recent years, electric shock accidents caused by leakage in road lighting and other circuits have occurred frequently, posing significant challenges to industry managers. Therefore, electrical safety is a critical issue. To prevent electric shock accidents at their source, industry management units have conducted extensive research on the prevention and control of street light leakage, ranging from various leakage prevention measures to the application of DC power supply solutions. However, to date, there has been no breakthrough in the detection and control technology for line leakage, particularly regarding the detection of leakage in single-phase power lines. Utility Model Content
[0004] This utility model provides a single-phase power line insulation strength detection alarm and controller to realize leakage detection and alarm functions for single-phase power lines.
[0005] Therefore, the present invention provides the following technical solution:
[0006] A detection alarm and controller for reduced insulation strength to ground in a single-phase power line is disclosed. The controller includes a first leakage current detection device, a first circuit processing unit, a second leakage current detection device, a second circuit processing unit, a fault memory circuit, and a secondary fault alarm circuit. One end of the first leakage current detection device is connected to a first output terminal of the power supply being detected, and the other end is connected to an input terminal of the first circuit processing unit. The output terminal of the first circuit processing unit is connected to an input terminal of the fault memory circuit. One end of the second leakage current detection device is connected to a second output terminal of the power supply being detected, and the other end is connected to an input terminal of the second circuit processing unit. The output terminal of the second circuit processing unit is connected to an input terminal of the fault memory circuit. The output terminal of the fault memory circuit is connected to the secondary fault alarm circuit.
[0007] Optionally, the first circuit processing unit includes a first detection isolation circuit, a first sensitivity adjustment potentiometer, and a first fault information driving processing circuit connected in sequence. When the first leakage signal detection device detects leakage at the first output terminal of the detected power supply, it sends a first leakage signal to the first detection isolation circuit. The first detection isolation circuit isolates the first leakage signal and transmits it to the first sensitivity adjustment potentiometer. The first sensitivity adjustment potentiometer adjusts the sensitivity of the first leakage signal and sends it to the first fault information driving processing circuit. The first fault information driving processing circuit processes the first leakage signal after sensitivity adjustment and outputs a first leakage fault signal.
[0008] Optionally, the second circuit processing unit includes a second detection isolation circuit, a second sensitivity adjustment potentiometer, and a second fault information driving processing circuit connected in sequence. When the second leakage signal detection device detects leakage at the second output terminal of the detected power supply, it sends a second leakage signal to the second detection isolation circuit. The second detection isolation circuit isolates the second leakage signal and transmits it to the second sensitivity adjustment potentiometer. The second sensitivity adjustment potentiometer adjusts the sensitivity of the second leakage signal and sends it to the second fault information driving processing circuit. The second fault information driving processing circuit processes the second leakage signal after sensitivity adjustment and outputs a second leakage fault signal.
[0009] Optionally, the single-phase power line insulation strength reduction detection alarm and controller further includes an OR gate drive circuit. The input terminal of the OR gate drive circuit is connected to the first fault information drive processing circuit and the second fault information drive processing circuit. When the first leakage fault signal or the second leakage fault signal is received, the OR gate drive signal is output.
[0010] Optionally, the single-phase power line insulation strength reduction detection alarm and controller further includes a primary fault alarm circuit. The primary fault alarm circuit is connected to the output terminal of the OR gate drive circuit. When the primary fault alarm circuit receives the OR gate drive signal, it performs a local display of a primary fault alarm and a remote notification of a primary fault alarm.
[0011] Optionally, the single-phase power line insulation strength reduction detection alarm and controller further includes a timer. The input terminal of the timer is connected to the primary fault alarm circuit. When the primary fault alarm circuit receives the OR gate drive signal, it sends a timing start signal to the timer to start timing. When the timer has timed out to a predetermined time, it outputs a timing control signal.
[0012] Optionally, the secondary fault alarm circuit is connected to the output terminal of the timer. When the fault memory circuit receives the first leakage fault signal or the second leakage fault signal, a leakage fault exists at one end of the detected power supply. If the fault memory circuit receives the second leakage fault signal or the first leakage fault signal again within the predetermined time, a leakage fault also exists at the other end of the detected power supply. At this time, the fault memory circuit sends a secondary fault alarm signal to the secondary fault alarm circuit. When the secondary fault alarm circuit receives either the secondary fault alarm signal or the timing control signal, it issues a secondary fault alarm message and outputs signals for local display of the secondary fault alarm, remote notification of the secondary fault alarm, forced execution of the secondary fault, and flexible management of the secondary fault.
[0013] Optionally, the single-phase power line insulation strength reduction detection alarm and controller further includes a main lamp flexible controller and an auxiliary lamp flexible controller. One end of the main lamp flexible controller is connected to the secondary fault alarm circuit, and the other end is connected to the main lamp line contactor. One end of the auxiliary lamp flexible controller is connected to the secondary fault alarm circuit, and the other end is connected to the auxiliary lamp line contactor. The main lamp flexible controller and the auxiliary lamp flexible controller respectively receive the secondary fault flexible management output signal and control the main lamp line contactor and the auxiliary lamp line contactor of the street light respectively, so as to control the main lamp and the auxiliary lamp to operate alternately.
[0014] Optionally, the single-phase power line insulation strength reduction detection alarm and controller further includes a detection drive power supply, which provides power to the single-phase power line insulation strength reduction detection alarm and controller.
[0015] Optionally, the power source being tested is a single-phase AC power source or a single-phase DC power source.
[0016] This utility model provides a single-phase power line insulation strength detection alarm and controller. It employs two sets of detection devices connected in series, with the intermediate node directly grounded. This forms a system where both output terminals of the power supply are equipped with fault signal sensors to detect whether the insulation strength to ground at the output terminal of the tested power supply (referred to as the "primary power supply") has decreased. Using this utility model, the single-phase power line insulation strength detection alarm and controller can conveniently and quickly detect whether there is leakage in a single-phase power line. When leakage is detected, a fault warning is issued, and a flexible power supply function is implemented to control the alternating operation of the main and auxiliary lights to ensure that the road is not completely dark. Attached Figure Description
[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0018] Figure 1 This is a structural diagram of a single-phase AC power line ground insulation strength detection alarm and controller in a specific embodiment of this utility model;
[0019] Figure 2 This is a structural diagram of a single-phase DC power supply line ground insulation strength detection alarm and controller in a specific embodiment of this utility model. Detailed Implementation
[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.
[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 skilled in the art without creative effort should fall within the protection scope of the present invention.
[0022] Figure 1 This is the electrical schematic diagram for a single-phase AC line insulation strength detection alarm and controller. Figure 2 This is the electrical schematic diagram of a single-phase DC line ground insulation strength detection alarm and controller. Figure 1 The power supply being tested, 1, is an AC power supply. Figure 2 The power supply 20 under test is a DC power supply. Figure 1 and Figure 2Components with the same reference numerals are components with the same function. The first leakage signal detection device 3, namely TDD1, is connected to the first output terminal of the power supply being tested. When leakage is detected at the first output terminal of the power supply being tested, it sends a first leakage signal to the first detection isolation circuit 5. The first detection isolation circuit 5 isolates the first leakage signal and then transmits it to the first sensitivity adjustment potentiometer 7. The first sensitivity adjustment potentiometer 7 adjusts the sensitivity of the first leakage signal and then sends it to the first fault information drive processing circuit 9. The first fault information drive processing circuit 9 processes the first leakage signal after sensitivity adjustment to obtain a first leakage fault signal. The first leakage fault signal has the ability to correct signal processing and anti-interference, and also has the driving capability of the final circuit.
[0023] The second leakage signal detection device 4, namely TDD2, is connected to the second output terminal of the power supply under test. When leakage is detected at the second output terminal of the power supply under test, a second leakage signal is sent to the second detection isolation circuit 6. The second detection isolation circuit 6 isolates the second leakage signal and then transmits it to the second sensitivity adjustment potentiometer 8. The second sensitivity adjustment potentiometer 8 adjusts the sensitivity of the second leakage signal and then sends it to the second fault information drive processing circuit 10. The second fault information drive processing circuit 10 processes the second leakage signal after sensitivity adjustment to obtain a second leakage fault signal. The second leakage fault signal has the ability to correct signal processing and anti-interference, and also has the driving capability of the final circuit.
[0024] Components 3, 5, 7, and 9 in the circuit constitute the leakage fault detection signal detection capability of the first output terminal of the primary power supply (e.g., AC power supply A terminal, DC power supply +KM terminal), and components 4, 6, 8, and 10 constitute the leakage fault detection signal detection capability of the second output terminal of the primary power supply (e.g., AC power supply N terminal, DC power supply -KM terminal). The two fault signals enter the OR gate drive circuit 11 respectively. When the OR gate drive circuit 11 receives the first or second leakage fault signal, that is, when a leakage fault occurs at any terminal of the primary power supply, it sends an OR gate drive signal to the primary fault alarm circuit 13. The primary fault alarm circuit 13 releases three types of fault information, including local display of the primary fault alarm, remote notification of the primary fault alarm, and a 2-hour timer start signal. After receiving this signal, the 2-hour timer 14 starts the timer. After the timer reaches the predetermined time, it sends a timing control signal to the secondary fault alarm 15.
[0025] When a single-phase power supply has a leakage current at the first output terminal, the first fault information drive processing circuit 9 will also output a first leakage fault signal to the fault memory circuit 12. If a leakage fault occurs at the other end of the power supply line, i.e., the second output terminal, within 2 hours after a fault occurs, this fault information will be merged with the original primary fault memory information of the fault memory circuit 12 and a secondary fault alarm signal will be sent to the secondary fault alarm circuit 15. The secondary fault alarm circuit 15 can issue a secondary fault alarm information upon receiving either the secondary fault alarm signal or the timing control signal, including local display of the secondary fault alarm, remote notification of the secondary fault alarm, forced execution output of the secondary fault, and flexible management output signal of the secondary fault.
[0026] The main light flexible controller 16 and the auxiliary light flexible controller 17 receive the secondary fault flexible management output signal and control the main light circuit contactor and auxiliary light circuit contactor of the streetlights respectively, controlling the main light and auxiliary light to operate alternately to ensure that the road is not completely dark. This enables alarm and control functions when a leakage fault occurs at any output terminal of the primary power supply, ensuring the safety and reliability of urban road lighting power supply lines against electric shock.
[0027] The neutral wires of the first and second leakage current detection devices are connected to the ground, forming a "zero potential" in the detection balance circuit. It is safe for a person to stand on the ground. When the insulation strength at any end of the primary power supply decreases, this "zero potential" shifts towards the output end of that power supply, causing the voltage to ground at the other output end to rise. When the detection signal of the second leakage current detection circuit exceeds the set sensitivity value, the fault information drive processing circuit issues a primary leakage current fault alarm. A leakage current fault at one end of the circuit will not result in a direct electric shock. However, in this power supply environment, touching the other end of the primary power supply poses a risk of electric shock, which is precisely the significance of a primary leakage current fault alarm.
[0028] The detection drive power supply provides power to the single-phase power line insulation strength reduction detection alarm and controller. In one embodiment, the detection drive power supply provides a +12V DC power supply to power the circuit.
[0029] The withstand voltage of the first and second leakage current detection devices is 1.05 times the power supply voltage. The rated current is controlled such that when any pole is grounded, the current of the detection device is less than 15mA, and the impedance value is greater than the withstand voltage / rated current.
[0030] A single-phase power supply can be either a single-phase AC power supply or a single-phase DC power supply.
[0031] This utility model's single-phase power line ground insulation strength detection alarm and controller, when in operation, when the ground insulation resistance value of any electrode drops to a set value (referred to as "primary fault"), the circuit processing unit (detection isolation circuit, sensitivity adjustment potentiometer, and fault information drive processing circuit) can issue information about a ground leakage fault at a certain power output terminal, releasing clear fault information externally, including local display and remote notification. Simultaneously, an internal fault memory circuit stores this fault information. When another electrode also experiences a fault, or if the "primary fault" is not resolved within 2 hours, the two faults overlap, and a "secondary fault control information" is released externally. This includes two aspects: first, executing control information and remote notification; second, the device also has a forced control function upon receiving the "secondary execution control information," including directly executing a "forced power supply function" or a flexible power supply function: a cyclical control function of "power outage for a certain time (seconds), then power restoration for a certain time (minutes)," with the set time selectable by the user. Most streetlights have circuits with alternating lamp control; flexible power supply can execute the alternating operation of main and auxiliary lights to ensure the road is not completely dark.
[0032] This invention can realize on-site and remote notification functions when a single-phase power supply (AC / DC) of any polarity leaks to the ground. It also has enhanced processing and control functions when both poles are faulty, as well as flexible control functions.
[0033] This invention employs two sets of detection devices connected in series, with the intermediate node directly grounded, forming a "fault signal sensor installed at the power output terminal" to detect whether the insulation strength of the tested power supply has decreased to ground. Each of the two detection signal sensors measures based on the voltage of the tested power supply. When the insulation strength of any electrode decreases to ground, the voltage of the other signal sensor will rise, thus confirming the decrease in insulation strength of that electrode and enabling subsequent circuit processing.
[0034] The embodiments of this utility model have been described in detail above. Specific implementation methods have been used to illustrate this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and system of this utility model, and are merely some, not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model. The content of this specification should not be construed as a limitation of this utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A detection alarm and controller for reduced insulation strength to ground in a single-phase power line, characterized in that, The single-phase power line insulation strength reduction detection alarm and controller includes a first leakage signal detection device, a first circuit processing unit, a second leakage signal detection device, a second circuit processing unit, a fault memory circuit, and a secondary fault alarm circuit. One end of the first leakage signal detection device is connected to the first output terminal of the power supply being detected, and the other end is connected to the input terminal of the first circuit processing unit. The output terminal of the first circuit processing unit is connected to the input terminal of the fault memory circuit. One end of the second leakage signal detection device is connected to the second output terminal of the power supply being detected, and the other end is connected to the input terminal of the second circuit processing unit. The output terminal of the second circuit processing unit is connected to the input terminal of the fault memory circuit. The output terminal of the fault memory circuit is connected to the secondary fault alarm circuit.
2. The single-phase power line insulation strength reduction detection alarm and controller according to claim 1, characterized in that, The first circuit processing unit includes a first detection isolation circuit, a first sensitivity adjustment potentiometer, and a first fault information driving processing circuit connected in sequence. When the first leakage signal detection device detects leakage at the first output terminal of the detected power supply, it sends a first leakage signal to the first detection isolation circuit. The first detection isolation circuit isolates the first leakage signal and transmits it to the first sensitivity adjustment potentiometer. The first sensitivity adjustment potentiometer adjusts the sensitivity of the first leakage signal and sends it to the first fault information driving processing circuit. The first fault information driving processing circuit processes the first leakage signal after sensitivity adjustment and outputs a first leakage fault signal.
3. The single-phase power line insulation strength reduction detection alarm and controller according to claim 2, characterized in that, The second circuit processing unit includes a second detection isolation circuit, a second sensitivity adjustment potentiometer, and a second fault information driving processing circuit connected in sequence. When the second leakage signal detection device detects leakage at the second output terminal of the detected power supply, it sends a second leakage signal to the second detection isolation circuit. The second detection isolation circuit isolates the second leakage signal and transmits it to the second sensitivity adjustment potentiometer. The second sensitivity adjustment potentiometer adjusts the sensitivity of the second leakage signal and sends it to the second fault information driving processing circuit. The second fault information driving processing circuit processes the second leakage signal after sensitivity adjustment and outputs a second leakage fault signal.
4. The single-phase power line insulation strength reduction detection alarm and controller according to claim 3, characterized in that, The single-phase power line insulation strength reduction detection alarm and controller also includes an OR gate drive circuit. The input terminal of the OR gate drive circuit is connected to the first fault information drive processing circuit and the second fault information drive processing circuit. When the first leakage fault signal or the second leakage fault signal is received, the OR gate drive signal is output.
5. The single-phase power line insulation strength reduction detection alarm and controller according to claim 4, characterized in that, The single-phase power line insulation strength reduction detection alarm and controller also includes a primary fault alarm circuit. The primary fault alarm circuit is connected to the output terminal of the OR gate drive circuit. When the primary fault alarm circuit receives the OR gate drive signal, it performs a local display of a primary fault alarm and a remote notification of a primary fault alarm.
6. The single-phase power line insulation strength reduction detection alarm and controller according to claim 5, characterized in that, The single-phase power line insulation strength reduction detection alarm and controller also includes a timer. The input terminal of the timer is connected to the primary fault alarm circuit. When the primary fault alarm circuit receives the OR gate drive signal, it sends a timing start signal to the timer to start timing. When the timer has timed out to a predetermined time, it outputs a timing control signal.
7. The single-phase power line insulation strength reduction detection alarm and controller according to claim 6, characterized in that, The secondary fault alarm circuit is connected to the output terminal of the timer. When the fault memory circuit receives the first leakage fault signal or the second leakage fault signal, one end of the detected power supply has a leakage fault. If the fault memory circuit receives the second leakage fault signal or the first leakage fault signal again within the predetermined time, the other end of the detected power supply also has a leakage fault. At this time, the fault memory circuit sends a secondary fault alarm signal to the secondary fault alarm circuit. When the secondary fault alarm circuit receives either the secondary fault alarm signal or the timing control signal, it issues a secondary fault alarm message and outputs signals for local display of secondary fault alarm, remote notification of secondary fault alarm, forced execution of secondary fault, and flexible management of secondary fault.
8. The single-phase power line insulation strength reduction detection alarm and controller according to claim 7, characterized in that, The single-phase power line insulation strength reduction detection alarm and controller also includes a main lamp flexible controller and an auxiliary lamp flexible controller. One end of the main lamp flexible controller is connected to the secondary fault alarm circuit, and the other end is connected to the main lamp line contactor. One end of the auxiliary lamp flexible controller is connected to the secondary fault alarm circuit, and the other end is connected to the auxiliary lamp line contactor. The main lamp flexible controller and the auxiliary lamp flexible controller respectively receive the secondary fault flexible management output signal and control the main lamp line contactor and the auxiliary lamp line contactor of the street light respectively, so as to control the main lamp and the auxiliary lamp to operate alternately.
9. The single-phase power line insulation strength reduction detection alarm and controller according to claim 1, characterized in that, The single-phase power line insulation strength reduction detection alarm and controller also includes a detection drive power supply, which provides power to the single-phase power line insulation strength reduction detection alarm and controller.
10. The single-phase power line insulation strength reduction detection alarm and controller according to claim 1, characterized in that, The power source being tested is a single-phase AC power source or a single-phase DC power source.